/* ==========================================================================
   VIỆT FORMULA — giao diện chính (mobile-first: 360 → 768 → 1024 → 1280 → 1920)
   Token: vf-tokens.css. Không phụ thuộc CSS theme cha.
   ========================================================================== */

/* ---------------------------------------------------------------- Nền tảng */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--vf-header-h) + 16px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; } }
body { margin: 0; background: var(--vf-bg); color: var(--vf-text); font: 400 var(--vf-fs-base)/var(--vf-lh-body) var(--vf-font-body); text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
a { color: var(--vf-cobalt); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--vf-cobalt-700); }
h1, h2, h3, h4 { font-family: var(--vf-font-display); color: var(--vf-graphite); line-height: var(--vf-lh-snug); letter-spacing: var(--vf-tracking-tight); margin: 0 0 .5em; font-weight: 700; }
p { margin: 0 0 1em; }
ul, ol { padding: 0; margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus { outline: none; }
:focus-visible { outline: 3px solid var(--vf-focus); outline-offset: 3px; border-radius: 3px; }
.vf-sec--ink :focus-visible, .vf-footer :focus-visible, .vf-ctaband :focus-visible, .vf-stats--dark :focus-visible { outline-color: #fff; }
.screen-reader-text { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.vf-skip { position: absolute; left: 12px; top: -60px; z-index: var(--vf-z-skip); background: var(--vf-graphite); color: #fff; padding: 12px 16px; border-radius: var(--vf-r-md); font-weight: 600; text-decoration: none; }
.vf-skip:focus { top: 12px; color: #fff; }
.vf-main:focus { outline: none; }
.vf-wrap { width: 100%; max-width: calc(var(--vf-container) + var(--vf-gutter) * 2); margin-inline: auto; padding-inline: var(--vf-gutter); }
.vf-wrap--text { max-width: calc(var(--vf-container-text) + var(--vf-gutter) * 2); }
.vf-ico { width: 1.25em; height: 1.25em; flex: none; }
.vf-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
@media (max-width: 1023px) { .vf-hide-md { display: none !important; } }

/* Lưới chấm kiểu giấy kỹ thuật */
.vf-gridbg { background-color: var(--vf-clean);
  background-image:
    radial-gradient(circle at 1px 1px, var(--vf-grid-dot) 1.1px, transparent 1.2px),
    linear-gradient(var(--vf-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--vf-grid-line) 1px, transparent 1px);
  background-size: var(--vf-grid-size) var(--vf-grid-size), calc(var(--vf-grid-size) * 4) calc(var(--vf-grid-size) * 4), calc(var(--vf-grid-size) * 4) calc(var(--vf-grid-size) * 4);
  background-position: -1px -1px; }

/* ---------------------------------------------------------------- Nút, link, tag */
.vf-btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 48px; padding: .75rem 1.25rem; border: 1.5px solid var(--vf-cobalt); border-radius: var(--vf-r-md);
  background: var(--vf-cobalt); color: #fff; font: 600 var(--vf-fs-sm)/1.2 var(--vf-font-body); text-decoration: none; white-space: nowrap; cursor: pointer;
  transition: background var(--vf-dur-1) var(--vf-ease), border-color var(--vf-dur-1), color var(--vf-dur-1), box-shadow var(--vf-dur-2), transform var(--vf-dur-1); }
.vf-btn:hover { background: var(--vf-cobalt-700); border-color: var(--vf-cobalt-700); color: #fff; box-shadow: var(--vf-sh-cta); }
.vf-btn:active { transform: translateY(1px); }
.vf-btn .vf-ico { width: 18px; height: 18px; }
.vf-btn--sm { min-height: 44px; padding: .55rem 1rem; }
.vf-btn--xs { min-height: 44px; padding: .4rem .8rem; font-size: var(--vf-fs-xs); }
.vf-btn--lg { min-height: 54px; padding: .9rem 1.6rem; font-size: var(--vf-fs-base); }
.vf-btn--block { display: flex; width: 100%; }
.vf-btn--ghost { background: transparent; color: var(--vf-cobalt); }
.vf-btn--ghost:hover { background: var(--vf-cobalt-50); color: var(--vf-cobalt-700); box-shadow: none; }
.vf-btn--light { background: #fff; border-color: #fff; color: var(--vf-graphite); }
.vf-btn--light:hover { background: var(--vf-cobalt-50); border-color: var(--vf-cobalt-50); color: var(--vf-graphite); box-shadow: none; }
.vf-btn--outline-light { background: transparent; border-color: rgba(255,255,255,.55); color: #fff; }
.vf-btn--outline-light:hover { background: rgba(255,255,255,.1); border-color: #fff; color: #fff; box-shadow: none; }
.vf-btn[disabled], .vf-btn[aria-disabled="true"] { opacity: .55; cursor: not-allowed; box-shadow: none; }
.vf-link { display: inline-flex; align-items: center; gap: .35rem; min-height: 44px; font-weight: 600; text-decoration: none; color: var(--vf-cobalt); }
.vf-link .vf-ico { width: 18px; height: 18px; transition: transform var(--vf-dur-2) var(--vf-ease); }
.vf-link:hover .vf-ico { transform: translateX(3px); }
.vf-link--sm { font-size: var(--vf-fs-sm); }
.vf-iconbtn { display: inline-grid; place-items: center; width: 44px; height: 44px; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); background: #fff; color: var(--vf-graphite); position: relative; text-decoration: none; }
.vf-iconbtn:hover { border-color: var(--vf-cobalt); color: var(--vf-cobalt); }
.vf-actions { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; margin-top: var(--vf-s-6); }
.vf-tag { display: inline-flex; align-items: center; gap: .3rem; padding: .2rem .55rem; border: 1px solid var(--vf-line-strong); border-radius: var(--vf-r-sm); background: #fff; font: 600 var(--vf-fs-2xs)/1.4 var(--vf-font-mono); letter-spacing: .02em; color: var(--vf-graphite-80); white-space: nowrap; }
.vf-tag .vf-ico { width: 14px; height: 14px; }
.vf-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--vf-mint); box-shadow: 0 0 0 3px rgba(60,196,164,.22); flex: none; }
.vf-status { display: inline-flex; align-items: center; gap: .45rem; font-weight: 600; color: var(--vf-mint-ink); }
.vf-note { display: flex; gap: .5rem; align-items: flex-start; font-size: var(--vf-fs-xs); color: var(--vf-muted); margin: var(--vf-s-4) 0 0; }
.vf-note .vf-ico { width: 16px; height: 16px; margin-top: 2px; color: var(--vf-steel); }
.vf-mono-t { font-family: var(--vf-font-mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
.vf-more { margin: var(--vf-s-6) 0 0; }
.vf-h2s { font-size: var(--vf-fs-lg); margin: var(--vf-s-8) 0 var(--vf-s-4); }
.vf-h2s:first-child { margin-top: 0; }

/* Eyebrow + tiêu đề section kiểu bản vẽ */
.vf-eyebrow { display: inline-flex; flex-wrap: wrap; align-items: center; gap: .6rem; margin: 0 0 var(--vf-s-4); font: 600 var(--vf-fs-xs)/1.3 var(--vf-font-mono); letter-spacing: var(--vf-tracking-label); text-transform: uppercase; color: var(--vf-muted); }
.vf-eyebrow a { color: inherit; text-decoration: none; }
.vf-eyebrow a:hover { color: var(--vf-cobalt); }
.vf-eyebrow__idx { display: inline-block; padding: .15rem .45rem; border: 1px solid currentColor; border-radius: var(--vf-r-xs); color: var(--vf-cobalt); letter-spacing: .04em; }
.vf-shead { max-width: 760px; margin-bottom: var(--vf-s-8); }
.vf-shead__title { font-size: var(--vf-fs-2xl); line-height: var(--vf-lh-tight); margin: 0 0 var(--vf-s-3); }
.vf-shead__title em { font-style: normal; color: var(--vf-cobalt); }
.vf-shead__lead { color: var(--vf-muted); font-size: var(--vf-fs-md); margin: 0; }
.vf-shead--center { margin-inline: auto; text-align: center; }

/* Section */
.vf-sec { padding-block: var(--vf-section); }
.vf-sec--tight { padding-block: clamp(2rem, 1.5rem + 2vw, 3.5rem); }
.vf-sec--soft { background: #fff; border-block: 1px solid var(--vf-line); }
.vf-sec--ink { background: var(--vf-graphite); color: var(--vf-on-dark); }
.vf-sec--ink h2, .vf-sec--ink h3 { color: #fff; }
.vf-sec--ink .vf-shead__lead, .vf-sec--ink .vf-eyebrow { color: var(--vf-on-dark-muted); }
.vf-sec--ink .vf-eyebrow__idx { color: #8FB0FF; }
.vf-sec__top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: var(--vf-s-4); margin-bottom: var(--vf-s-8); }
.vf-sec__top .vf-shead { margin-bottom: 0; }
.vf-split { display: grid; gap: var(--vf-s-10); }
@media (min-width: 1024px) { .vf-split { grid-template-columns: 1fr 1fr; gap: var(--vf-s-16); align-items: start; } .vf-split--wide { grid-template-columns: 1.15fr .85fr; } }
.vf-grid { display: grid; gap: var(--vf-s-5); grid-template-columns: 1fr; }
@media (min-width: 600px) { .vf-grid--3, .vf-grid--4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .vf-grid--3 { grid-template-columns: repeat(3, 1fr); } .vf-grid--4 { grid-template-columns: repeat(4, 1fr); } }

/* ---------------------------------------------------------------- Topbar + header */
.vf-topbar { background: var(--vf-graphite); color: var(--vf-on-dark); font-size: var(--vf-fs-xs); }
.vf-topbar__in { display: flex; justify-content: space-between; align-items: center; gap: 1rem; min-height: 36px; }
.vf-topbar__msg { display: block; margin: 0; padding-block: .45rem; line-height: 1.4; }
.vf-topbar__msg .vf-dot { margin-right: .45rem; vertical-align: 1px; }
.vf-topbar__msg strong { color: #fff; }
.vf-topbar__links { display: none; list-style: none; gap: 1.25rem; }
.vf-topbar__links a { display: inline-flex; align-items: center; gap: .35rem; color: var(--vf-on-dark); text-decoration: none; min-height: 36px; }
.vf-topbar__links a:hover { color: #fff; text-decoration: underline; }
.vf-topbar__links .vf-ico { width: 15px; height: 15px; }
@media (max-width: 599px) { .vf-topbar__msg { font-size: 12px; } .vf-topbar__msg span.vf-dot { display: none; } }
@media (min-width: 900px) { .vf-topbar__links { display: flex; } }

.vf-header { position: sticky; top: 0; z-index: var(--vf-z-header); background: rgba(255,255,255,.96); border-bottom: 1px solid var(--vf-line); transition: box-shadow var(--vf-dur-2); }
@supports (backdrop-filter: blur(8px)) { .vf-header { background: rgba(255,255,255,.88); backdrop-filter: saturate(1.4) blur(10px); } }
.vf-header.is-stuck { box-shadow: 0 8px 24px -16px rgba(28,36,48,.35); }
.vf-header__in { display: flex; align-items: center; gap: var(--vf-s-4); min-height: 64px; }
@media (min-width: 1024px) { .vf-header__in { min-height: var(--vf-header-h); } }
.vf-logo { display: inline-flex; color: var(--vf-graphite); text-decoration: none; margin-right: auto; }
.vf-logo__inner { display: inline-flex; align-items: center; gap: .6rem; }
.vf-logo__mark { width: 36px; height: 36px; flex: none; }
.vf-logo__text { display: flex; flex-direction: column; line-height: 1; }
.vf-logo__word { font: 700 1.125rem/1 var(--vf-font-display); letter-spacing: -.01em; color: var(--vf-graphite); }
.vf-logo__word b { color: var(--vf-cobalt); font-weight: 700; margin-left: 2px; }
.vf-logo__sub { white-space: nowrap; margin-top: 4px; font: 600 9.5px/1 var(--vf-font-mono); letter-spacing: .14em; color: var(--vf-muted); }
.vf-logo--light .vf-logo__word { color: #fff; }
.vf-logo--light .vf-logo__word b { color: #8FB0FF; }
.vf-logo--light .vf-logo__sub { color: var(--vf-on-dark-muted); }

.vf-nav { display: none; }
.vf-menu { display: flex; align-items: center; list-style: none; gap: .1rem; }
.vf-menu__item { position: relative; display: flex; align-items: center; }
.vf-menu__link { display: inline-flex; align-items: center; min-height: 44px; padding: .5rem .45rem; white-space: nowrap; font-weight: 500; font-size: var(--vf-fs-sm); color: var(--vf-graphite); text-decoration: none; border-radius: var(--vf-r-sm); }
.vf-menu__link:hover, .vf-menu__item.is-current > .vf-menu__link { color: var(--vf-cobalt); }
.vf-menu__item.is-current > .vf-menu__link { box-shadow: inset 0 -2px 0 var(--vf-cobalt); border-radius: 0; }
.vf-menu__toggle { display: inline-grid; place-items: center; width: 28px; height: 44px; margin-left: -.35rem; padding: 0; border: 0; background: none; color: var(--vf-muted); }
.vf-menu__toggle .vf-ico { width: 16px; height: 16px; transition: transform var(--vf-dur-2); }
.vf-menu__toggle[aria-expanded="true"] .vf-ico { transform: rotate(180deg); }
.vf-menu .vf-sub { position: absolute; top: calc(100% + 6px); left: -.5rem; min-width: 280px; padding: .5rem; list-style: none; background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); box-shadow: var(--vf-sh-3); display: grid; gap: 2px; }
.vf-menu .vf-sub[hidden] { display: none; }
.vf-menu .has-sub:hover > .vf-sub[hidden] { display: grid; }
.vf-menu .has-sub::after { content: ""; position: absolute; left: 0; right: 0; top: 100%; height: 8px; }
.vf-menu .vf-sub:has(> li:nth-child(6)) { grid-template-columns: 1fr 1fr; min-width: 520px; }
.vf-sub__link { display: flex; flex-direction: column; gap: 2px; min-height: 44px; justify-content: center; padding: .5rem .75rem; border-radius: var(--vf-r-md); color: var(--vf-graphite); text-decoration: none; font-size: var(--vf-fs-sm); font-weight: 500; }
.vf-sub__link small { color: var(--vf-muted); font-size: var(--vf-fs-xs); font-weight: 400; }
.vf-sub__link:hover, .vf-sub__link[aria-current] { background: var(--vf-cobalt-50); color: var(--vf-cobalt-800); }
.vf-header__act { display: flex; align-items: center; gap: .5rem; }
.vf-header__phone { display: none; align-items: center; gap: .55rem; padding: 0 .5rem; min-height: 44px; text-decoration: none; color: var(--vf-graphite); }
.vf-header__phone .vf-ico { width: 34px; height: 34px; padding: 8px; border-radius: 50%; background: var(--vf-cobalt-50); color: var(--vf-cobalt); }
.vf-header__phone span { display: flex; flex-direction: column; line-height: 1.15; }
.vf-header__phone small { font-size: 11px; color: var(--vf-muted); }
.vf-header__phone strong { font: 700 var(--vf-fs-sm)/1.2 var(--vf-font-mono); }
.vf-header__cta { display: none; }
.vf-badge-n { position: absolute; top: -6px; right: -6px; min-width: 20px; height: 20px; padding: 0 5px; border-radius: 10px; background: var(--vf-cobalt); color: #fff; font: 700 11px/20px var(--vf-font-mono); text-align: center; }
@media (min-width: 600px) { .vf-header__cta { display: inline-flex; } }
@media (min-width: 1240px) {
  .vf-nav { display: block; }
  .vf-burger { display: none; }
  .vf-logo { margin-right: var(--vf-s-4); }
  .vf-nav { margin-right: auto; }
}
@media (min-width: 1360px) { .vf-header__phone { display: inline-flex; } .vf-menu__link { padding-inline: .7rem; } }

/* Ngăn kéo mobile */
.vf-drawer { position: fixed; inset: 0; z-index: var(--vf-z-drawer); background: rgba(28,36,48,.5); }
.vf-drawer[hidden] { display: none; }
.vf-drawer__panel { position: absolute; inset: 0 0 0 auto; width: min(92vw, 420px); background: #fff; display: flex; flex-direction: column; overflow-y: auto; overscroll-behavior: contain; animation: vf-slide var(--vf-dur-2) var(--vf-ease); }
@keyframes vf-slide { from { transform: translateX(24px); opacity: 0; } to { transform: none; opacity: 1; } }
.vf-drawer__head { display: flex; justify-content: space-between; align-items: center; padding: .75rem var(--vf-gutter); border-bottom: 1px solid var(--vf-line); }
.vf-drawer__nav { padding: .5rem var(--vf-gutter); flex: 1; }
.vf-mmenu { list-style: none; }
.vf-mmenu .vf-menu__item { flex-wrap: wrap; border-bottom: 1px solid var(--vf-line); }
.vf-mmenu .vf-menu__link { flex: 1; min-height: 52px; font-size: var(--vf-fs-base); padding-inline: 0; box-shadow: none !important; }
.vf-mmenu .vf-menu__toggle { width: 48px; height: 52px; margin: 0; }
.vf-mmenu .vf-sub { list-style: none; flex-basis: 100%; padding: 0 0 .75rem .5rem; }
.vf-mmenu .vf-sub__link { min-height: 44px; padding-inline: .5rem; }
.vf-drawer__cta { display: grid; gap: .6rem; padding: var(--vf-s-4) var(--vf-gutter) calc(var(--vf-s-6) + env(safe-area-inset-bottom)); border-top: 1px solid var(--vf-line); }
body.vf-lock { overflow: hidden; }

/* ---------------------------------------------------------------- Breadcrumb */
.vf-crumb { margin-bottom: var(--vf-s-5); font-size: var(--vf-fs-xs); }
.vf-crumb ol { display: flex; flex-wrap: wrap; list-style: none; gap: .25rem .5rem; align-items: center; }
.vf-crumb li { display: inline-flex; align-items: center; gap: .5rem; color: var(--vf-muted); }
.vf-crumb li + li::before { content: "/"; color: var(--vf-steel); }
.vf-crumb a { color: var(--vf-graphite-80); text-decoration: none; display: inline-block; padding-block: .6rem; }
.vf-crumb a:hover { color: var(--vf-cobalt); text-decoration: underline; }
.vf-crumb [aria-current] { color: var(--vf-muted); display: inline-block; max-width: 60vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; vertical-align: bottom; }

/* ---------------------------------------------------------------- Hero trang chủ */
.vf-hero { padding-block: clamp(2rem, 1rem + 4vw, 5rem) clamp(2.5rem, 1.5rem + 4vw, 5.5rem); border-bottom: 1px solid var(--vf-line); }
.vf-hero__in { display: grid; gap: var(--vf-s-10); align-items: center; }
@media (min-width: 1024px) { .vf-hero__in { grid-template-columns: 1.02fr 1fr; gap: var(--vf-s-12); } }
.vf-hero__h1 { font-size: var(--vf-fs-3xl); line-height: 1.06; margin-bottom: var(--vf-s-5); }
.vf-hero__h1 em { display: block; font-style: normal; color: var(--vf-cobalt); }
.vf-hero__lead { font-size: var(--vf-fs-md); color: var(--vf-graphite-80); max-width: 36em; }
.vf-hero__proof { list-style: none; display: grid; gap: .45rem; margin-top: var(--vf-s-6); font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); }
.vf-hero__proof li { display: flex; gap: .5rem; align-items: center; }
.vf-hero__proof .vf-ico { width: 18px; height: 18px; color: var(--vf-mint-ink); }
@media (min-width: 600px) { .vf-hero__proof { grid-template-columns: repeat(3, auto); justify-content: start; gap: 1.25rem; } }
.vf-hero__media { position: relative; }
.vf-frame { position: relative; margin: 0; border-radius: var(--vf-r-lg); overflow: hidden; background: var(--vf-steel-300); box-shadow: var(--vf-sh-3); aspect-ratio: 3 / 2; }
.vf-frame img, .vf-frame video { width: 100%; height: 100%; object-fit: cover; }
.vf-frame::before, .vf-frame::after { content: ""; position: absolute; width: 22px; height: 22px; border: 2px solid #fff; z-index: 2; pointer-events: none; }
.vf-frame::before { top: 12px; left: 12px; border-right: 0; border-bottom: 0; }
.vf-frame::after { right: 12px; bottom: 12px; border-left: 0; border-top: 0; }
.vf-frame__tag { position: absolute; left: 12px; bottom: 12px; z-index: 2; padding: .3rem .55rem; background: rgba(28,36,48,.78); color: #fff; font: 600 11px/1.2 var(--vf-font-mono); letter-spacing: .08em; border-radius: var(--vf-r-xs); }
.vf-frame--hero { aspect-ratio: 4 / 3; }
.vf-hero__video { position: absolute; inset: 0; opacity: 0; transition: opacity var(--vf-dur-4) var(--vf-ease); }
.vf-hero__video.is-on { opacity: 1; }
.vf-hero__pause { position: absolute; right: 12px; top: 12px; z-index: 3; width: 44px; height: 44px; border-radius: 50%; border: 0; background: rgba(28,36,48,.7); color: #fff; display: grid; place-items: center; }
.vf-hero__pause[aria-pressed="true"] svg path { d: path("M8 5l11 7-11 7z"); }
.vf-hero__spec { position: relative; margin: -1.5rem 1rem 0; z-index: 3; display: flex; flex-wrap: wrap; gap: .4rem 1.1rem; align-items: center; padding: .75rem 1rem; background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); box-shadow: var(--vf-sh-2); font-size: var(--vf-fs-xs); color: var(--vf-graphite-80); }
.vf-hero__spec b { font: 700 var(--vf-fs-base)/1 var(--vf-font-display); color: var(--vf-graphite); }
.vf-hero__spec-k { width: 100%; font: 600 10.5px/1 var(--vf-font-mono); letter-spacing: .12em; color: var(--vf-muted); }
@media (min-width: 1024px) { .vf-hero__spec { position: absolute; left: -2rem; bottom: 2rem; margin: 0; max-width: 300px; } }

/* ---------------------------------------------------------------- Hero trang con */
.vf-phero { padding-block: clamp(1.25rem, .8rem + 2vw, 2.5rem) clamp(2.5rem, 1.5rem + 3.5vw, 4.5rem); border-bottom: 1px solid var(--vf-line); }
.vf-phero--slim { padding-bottom: clamp(2rem, 1.2rem + 2.5vw, 3.5rem); }
.vf-phero__in { display: grid; gap: var(--vf-s-8); align-items: center; }
@media (min-width: 1024px) { .vf-phero--media .vf-phero__in { grid-template-columns: 1.1fr .9fr; gap: var(--vf-s-12); } }
.vf-phero__h1 { font-size: var(--vf-fs-2xl); line-height: var(--vf-lh-tight); margin-bottom: var(--vf-s-4); max-width: 22em; }
.vf-phero__lead { font-size: var(--vf-fs-md); color: var(--vf-graphite-80); max-width: 42em; margin-bottom: 0; }
.vf-phero__meta { margin-top: var(--vf-s-4); }
.vf-phero__media .vf-frame { aspect-ratio: 3 / 2; }
.vf-phero__svg { max-width: 240px; margin-inline: auto; }
.vf-chips { display: flex; flex-wrap: wrap; gap: .5rem; list-style: none; margin-top: var(--vf-s-5); }
.vf-chips li { padding: .35rem .7rem; border: 1px solid var(--vf-line-strong); border-radius: var(--vf-r-pill); background: #fff; font-size: var(--vf-fs-xs); color: var(--vf-graphite-80); }
.vf-chips strong { font-family: var(--vf-font-mono); color: var(--vf-graphite); margin-right: .25rem; }

/* ---------------------------------------------------------------- Số liệu lớn */
.vf-stats { padding-block: clamp(2rem, 1.5rem + 2.5vw, 3.5rem); border-bottom: 1px solid var(--vf-line); background: #fff; }
.vf-stats--dark { background: var(--vf-graphite); border: 0; color: var(--vf-on-dark); }
.vf-stats--sm { padding-block: var(--vf-s-8); }
.vf-stats__grid { display: grid; grid-template-columns: repeat(2, 1fr); margin: 0; border-top: 1px solid var(--vf-line); }
.vf-stats--dark .vf-stats__grid { border-color: rgba(255,255,255,.14); }
@media (min-width: 900px) { .vf-stats__grid { grid-template-columns: repeat(4, 1fr); } .vf-stats__grid--3 { grid-template-columns: repeat(3, 1fr); } }
.vf-stat { display: flex; flex-direction: column-reverse; justify-content: flex-end; gap: .4rem; padding: var(--vf-s-5) var(--vf-s-4) 0 0; border-right: 1px solid var(--vf-line); }
.vf-stat:nth-child(2n) { padding-left: var(--vf-s-4); border-right: 0; }
@media (min-width: 900px) { .vf-stat, .vf-stat:nth-child(2n) { padding-left: var(--vf-s-5); border-right: 1px solid var(--vf-line); } .vf-stat:first-child { padding-left: 0; } .vf-stat:last-child { border-right: 0; } }
.vf-stats--dark .vf-stat { border-color: rgba(255,255,255,.14); }
.vf-stat__l { font-size: var(--vf-fs-xs); color: var(--vf-muted); max-width: 18em; }
.vf-stats--dark .vf-stat__l { color: var(--vf-on-dark-muted); }
.vf-stat__v { margin: 0; display: flex; align-items: baseline; gap: .3rem; }
.vf-stat__n { font: 700 var(--vf-fs-num)/1 var(--vf-font-display); letter-spacing: -.04em; color: var(--vf-graphite); font-variant-numeric: tabular-nums; }
.vf-stats--sm .vf-stat__n { font-size: var(--vf-fs-2xl); }
.vf-stats--dark .vf-stat__n { color: #fff; }
.vf-stat__u { font: 700 var(--vf-fs-md)/1 var(--vf-font-display); color: var(--vf-cobalt); }
.vf-stats--dark .vf-stat__u { color: var(--vf-mint); }

/* ---------------------------------------------------------------- Chứng nhận */
.vf-certs { padding-block: var(--vf-s-6); background: var(--vf-clean); border-bottom: 1px solid var(--vf-line); }
.vf-certs--full { padding-block: var(--vf-section); }
.vf-certs__list { list-style: none; display: grid; grid-template-columns: 1fr; gap: .6rem; }
@media (min-width: 600px) { .vf-certs__list { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .vf-certs__list { grid-template-columns: repeat(5, 1fr); } }
.vf-cert { position: relative; display: flex; align-items: center; gap: .75rem; padding: .85rem 1rem; background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); }
.vf-cert__seal { display: grid; place-items: center; width: 42px; height: 42px; flex: none; border-radius: 50%; border: 1.5px dashed var(--vf-cobalt); color: var(--vf-cobalt); }
.vf-cert__seal .vf-ico { width: 22px; height: 22px; }
.vf-cert__txt { display: flex; flex-direction: column; line-height: 1.3; font-size: var(--vf-fs-xs); color: var(--vf-muted); }
.vf-cert__txt strong { font: 700 var(--vf-fs-sm)/1.2 var(--vf-font-display); color: var(--vf-graphite); }
.vf-cert__txt small { margin-top: .3rem; font-size: 12px; }
.vf-cert__ok { position: absolute; top: 6px; right: 6px; width: 18px; height: 18px; border-radius: 50%; background: var(--vf-mint); color: #fff; display: grid; place-items: center; }
.vf-cert__ok .vf-ico { width: 12px; height: 12px; stroke-width: 3; }
.vf-certs--full .vf-cert { flex-direction: column; align-items: flex-start; padding: 1.25rem; }
.vf-certs__more { margin: .5rem 0 0; }

/* ---------------------------------------------------------------- Tabs "Bạn là ai?" */
.vf-tabs__list { display: flex; gap: .5rem; overflow-x: auto; padding-bottom: .5rem; margin-bottom: var(--vf-s-6); scrollbar-width: thin; }
.vf-tabs__tab { display: inline-flex; align-items: center; gap: .5rem; min-height: 48px; padding: .6rem 1rem; border: 1px solid var(--vf-line-strong); border-radius: var(--vf-r-pill); background: #fff; font-weight: 600; font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); white-space: nowrap; transition: all var(--vf-dur-1); }
.vf-tabs__tab:hover { border-color: var(--vf-cobalt); color: var(--vf-cobalt); }
.vf-tabs__tab[aria-selected="true"] { background: var(--vf-graphite); border-color: var(--vf-graphite); color: #fff; }
.vf-tabs__tab .vf-ico { width: 20px; height: 20px; }
.no-js .vf-tabs__panel[hidden] { display: block; }
.vf-persona { display: grid; gap: var(--vf-s-6); background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); overflow: hidden; animation: vf-fade var(--vf-dur-3) var(--vf-ease); }
@keyframes vf-fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@media (min-width: 900px) { .vf-persona { grid-template-columns: .9fr 1.1fr; } }
.vf-persona__img { position: relative; background: var(--vf-steel-300); }
.vf-persona__img img { width: 100%; height: auto; object-fit: cover; aspect-ratio: 3 / 2; }
@media (min-width: 900px) { .vf-persona__img { min-height: 360px; } .vf-persona__img img { position: absolute; inset: 0; height: 100%; aspect-ratio: auto; } }
.vf-persona__body { padding: var(--vf-s-6) var(--vf-s-5) var(--vf-s-8); }
@media (min-width: 900px) { .vf-persona__body { padding: var(--vf-s-10) var(--vf-s-10) var(--vf-s-10) 0; } }
.vf-persona__t { font-size: var(--vf-fs-xl); margin-bottom: .35rem; }
.vf-persona__pain { color: var(--vf-muted); }
.vf-specs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin: var(--vf-s-5) 0; background: var(--vf-line); border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); overflow: hidden; }
.vf-specs > div { background: #fff; padding: .7rem .85rem; }
.vf-specs dt { font: 600 11px/1.3 var(--vf-font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--vf-muted); }
.vf-specs dd { margin: .2rem 0 0; font-weight: 600; font-size: var(--vf-fs-sm); }
.vf-specs dd a { text-decoration: none; }
.vf-specs--stack { grid-template-columns: 1fr; }
.vf-path { list-style: none; counter-reset: p; display: grid; gap: .5rem; }
.vf-path li { counter-increment: p; display: flex; gap: .75rem; align-items: baseline; font-size: var(--vf-fs-sm); }
.vf-path li::before { content: counter(p, decimal-leading-zero); font: 700 var(--vf-fs-xs)/1 var(--vf-font-mono); color: var(--vf-cobalt); }

/* ---------------------------------------------------------------- Dịch vụ */
.vf-svc-grid { display: grid; gap: 1px; background: var(--vf-line); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); overflow: hidden; }
@media (min-width: 700px) { .vf-svc-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .vf-svc-grid { grid-template-columns: repeat(3, 1fr); } }
.vf-svc { position: relative; display: flex; flex-direction: column; gap: .5rem; padding: var(--vf-s-6) var(--vf-s-5) var(--vf-s-6); background: #fff; transition: background var(--vf-dur-2); }
.vf-svc:hover { background: var(--vf-cobalt-50); }
.vf-svc--hl { background: var(--vf-graphite); color: var(--vf-on-dark); }
.vf-svc--hl:hover { background: var(--vf-graphite-90); }
.vf-svc__no { position: absolute; top: var(--vf-s-5); right: var(--vf-s-5); font: 600 var(--vf-fs-xs)/1 var(--vf-font-mono); color: var(--vf-steel-ink); }
.vf-svc__ico { display: grid; place-items: center; width: 48px; height: 48px; border-radius: var(--vf-r-md); background: var(--vf-cobalt-50); color: var(--vf-cobalt); margin-bottom: .5rem; }
.vf-svc--hl .vf-svc__no, .vf-svc--cta .vf-svc__no { color: var(--vf-on-dark-muted); }
.vf-svc--hl .vf-svc__ico { background: rgba(255,255,255,.08); color: var(--vf-mint); }
.vf-svc__t { font-size: var(--vf-fs-lg); margin: 0; }
.vf-svc__t a { color: inherit; text-decoration: none; }
.vf-svc__t a::after { content: ""; position: absolute; inset: 0; }
.vf-svc--hl .vf-svc__t { color: #fff; }
.vf-svc p { color: var(--vf-muted); font-size: var(--vf-fs-sm); margin: 0; }
.vf-svc--hl p { color: var(--vf-on-dark-muted); }
.vf-svc__meta { display: flex; flex-wrap: wrap; gap: .25rem 1.25rem; margin: auto 0 0; padding-top: var(--vf-s-4); font-size: var(--vf-fs-xs); }
.vf-svc__meta div { display: flex; gap: .35rem; }
.vf-svc__meta dt { color: var(--vf-muted); }
.vf-svc--hl .vf-svc__meta dt { color: var(--vf-on-dark-muted); }
.vf-svc__meta dd { margin: 0; font-weight: 600; }
.vf-svc__badge { align-self: flex-start; order: -1; padding: .2rem .55rem; border-radius: var(--vf-r-pill); background: var(--vf-mint); color: var(--vf-graphite); font: 700 11px/1.4 var(--vf-font-mono); letter-spacing: .04em; }
.vf-svc--cta { justify-content: center; background: var(--vf-cobalt); color: #fff; }
.vf-svc--cta:hover { background: var(--vf-cobalt-700); }
.vf-svc--cta .vf-svc__t { color: #fff; }
.vf-svc--cta p { color: #DCE5FB; padding-right: 2.25rem; }
.vf-svc--cta .vf-svc__go { color: #fff; }
.vf-svc__go { position: absolute; right: var(--vf-s-5); bottom: var(--vf-s-5); color: var(--vf-cobalt); transition: transform var(--vf-dur-2); }
.vf-svc--hl .vf-svc__go { color: var(--vf-mint); }
.vf-svc:hover .vf-svc__go { transform: translateX(4px); }

/* ---------------------------------------------------------------- Quy trình: Gantt + timeline */
.vf-gantt { margin: 0 0 var(--vf-s-10); padding: var(--vf-s-5); background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); }
.vf-gantt__cap { display: flex; justify-content: space-between; gap: 1rem; font: 600 var(--vf-fs-xs)/1.3 var(--vf-font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--vf-muted); margin-bottom: var(--vf-s-4); }
.vf-gantt__scale { position: relative; height: 18px; margin-left: 0; font: 600 11px/1 var(--vf-font-mono); color: var(--vf-muted); }
.vf-gantt__scale span { position: absolute; left: var(--x); transform: translateX(-50%); }
.vf-gantt__rows { list-style: none; display: grid; gap: .5rem; }
.vf-gantt__row { display: grid; grid-template-columns: 1fr auto; grid-template-areas: "lbl d" "track track"; gap: .25rem .75rem; align-items: center; font-size: var(--vf-fs-xs); }
.vf-gantt__lbl { grid-area: lbl; font-weight: 600; }
.vf-gantt__d { grid-area: d; color: var(--vf-muted); font-family: var(--vf-font-mono); }
.vf-gantt__track { grid-area: track; position: relative; height: 12px; border-radius: 6px; background: repeating-linear-gradient(90deg, var(--vf-line) 0 1px, transparent 1px calc(100% / 9)); background-color: var(--vf-clean); }
.vf-gantt__bar { position: absolute; top: 0; bottom: 0; left: var(--a); width: var(--b); border-radius: 6px; background: var(--vf-cobalt); transform-origin: left; }
.vf-gantt__bar--par { background: repeating-linear-gradient(135deg, var(--vf-mint) 0 6px, #2fae90 6px 12px); }
.vf-js .vf-gantt__bar { transform: scaleX(0); transition: transform 900ms var(--vf-ease); }
.vf-js .vf-gantt.is-in .vf-gantt__bar { transform: scaleX(1); }
.vf-js .vf-gantt__row:nth-child(2) .vf-gantt__bar { transition-delay: 90ms; } .vf-js .vf-gantt__row:nth-child(3) .vf-gantt__bar { transition-delay: 180ms; }
.vf-js .vf-gantt__row:nth-child(4) .vf-gantt__bar { transition-delay: 270ms; } .vf-js .vf-gantt__row:nth-child(5) .vf-gantt__bar { transition-delay: 360ms; }
.vf-js .vf-gantt__row:nth-child(6) .vf-gantt__bar { transition-delay: 450ms; } .vf-js .vf-gantt__row:nth-child(7) .vf-gantt__bar { transition-delay: 540ms; }
@media (min-width: 768px) { .vf-gantt__row { grid-template-columns: 170px 1fr 150px; grid-template-areas: "lbl track d"; } .vf-gantt__scale { margin-left: calc(170px + .75rem); margin-right: calc(150px + .75rem); } }
@media (max-width: 767px) { .vf-gantt__scale { display: none; } }

.vf-steps { position: relative; }
.vf-steps__rail { position: absolute; left: 23px; top: 8px; bottom: 8px; width: 2px; background: var(--vf-line-strong); }
.vf-steps__fill { position: absolute; inset: 0; background: linear-gradient(var(--vf-cobalt), var(--vf-mint)); transform-origin: top; transform: scaleY(var(--p, 1)); }
.vf-js .vf-steps__fill { transform: scaleY(var(--p, 0)); }
.vf-steps__list { list-style: none; display: grid; gap: var(--vf-s-5); }
.vf-step { position: relative; display: grid; grid-template-columns: 48px 1fr; gap: var(--vf-s-4); }
.vf-step__node { position: relative; z-index: 1; display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; background: #fff; border: 2px solid var(--vf-line-strong); color: var(--vf-steel); transition: all var(--vf-dur-3) var(--vf-ease); }
.vf-step.is-done .vf-step__node { border-color: var(--vf-cobalt); background: var(--vf-cobalt); color: #fff; }
.no-js .vf-step__node, .vf-reduced .vf-step__node { border-color: var(--vf-cobalt); color: var(--vf-cobalt); }
.vf-step__node .vf-ico { width: 22px; height: 22px; }
.vf-step__card { background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); padding: var(--vf-s-5); }
.vf-step__head { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem .75rem; margin-bottom: .5rem; }
.vf-step__no { font: 700 var(--vf-fs-sm)/1 var(--vf-font-mono); color: var(--vf-cobalt); }
.vf-step__t { margin: 0; font-size: var(--vf-fs-lg); flex: 1 1 auto; }
.vf-step__card > p { color: var(--vf-graphite-80); font-size: var(--vf-fs-sm); }
.vf-step__spec { display: grid; gap: .75rem; margin: 0; padding-top: .75rem; border-top: 1px dashed var(--vf-line-strong); }
@media (min-width: 768px) { .vf-step__spec { grid-template-columns: 1fr 1fr; } }
.vf-step__spec dt { font: 600 11px/1.3 var(--vf-font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--vf-muted); margin-bottom: .25rem; }
.vf-step__spec dd { margin: 0; font-size: var(--vf-fs-sm); font-weight: 500; }
.vf-step__spec ul { list-style: none; display: grid; gap: .2rem; }
.vf-step__spec li::before { content: "— "; color: var(--vf-steel); }
@media (min-width: 1024px) {
  .vf-steps__rail { left: 50%; margin-left: -1px; }
  .vf-step { grid-template-columns: 1fr 48px 1fr; gap: var(--vf-s-6); }
  .vf-step__node { grid-column: 2; grid-row: 1; }
  .vf-step__card { grid-column: 3; grid-row: 1; }
  .vf-step:nth-child(even) .vf-step__card { grid-column: 1; }
  .vf-steps__list { gap: var(--vf-s-2); }
}
.vf-mini-steps { list-style: none; display: grid; gap: .5rem; grid-template-columns: 1fr; }
@media (min-width: 700px) { .vf-mini-steps { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .vf-mini-steps { grid-template-columns: repeat(4, 1fr); } }
.vf-mini-steps li { display: grid; grid-template-columns: auto 1fr; gap: .1rem .75rem; padding: .85rem 1rem; background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); }
.vf-mini-steps__no { grid-row: span 2; font: 700 var(--vf-fs-lg)/1 var(--vf-font-display); color: var(--vf-cobalt); }
.vf-mini-steps small { color: var(--vf-muted); font-size: var(--vf-fs-xs); }

/* ---------------------------------------------------------------- Bản vẽ chai lọ */
.vf-btl { width: 100%; height: auto; overflow: visible; }
.vf-btl__axis { fill: none; stroke: var(--vf-steel); stroke-width: .6; stroke-dasharray: 6 3 1 3; opacity: .7; }
.vf-btl__body { fill: var(--vf-btl-body, #fff); stroke: var(--vf-graphite); stroke-width: 1.2; transition: fill var(--vf-dur-2); }
.vf-btl__cap > * { fill: var(--vf-btl-cap, var(--vf-clean)); stroke: var(--vf-graphite); stroke-width: 1.2; transition: fill var(--vf-dur-2); }
.vf-btl__cap > [stroke-width] { fill: none; }
.vf-btl__label { fill: none; stroke: var(--vf-cobalt); stroke-width: .8; stroke-dasharray: 3 2; }
.vf-btl__brand { font: 700 7px/1 var(--vf-font-display); fill: var(--vf-graphite); letter-spacing: .08em; }
.vf-btl__dim path { fill: none; stroke: var(--vf-cobalt); stroke-width: .7; }
.vf-btl__dim text { font: 600 8.5px/1 var(--vf-font-mono); fill: var(--vf-cobalt); }

/* ---------------------------------------------------------------- Thẻ công thức (spec sheet) */
.vf-pills { display: flex; flex-wrap: wrap; gap: .5rem; list-style: none; margin: 0 0 var(--vf-s-6); }
.vf-pills a { display: inline-flex; align-items: center; gap: .35rem; min-height: 44px; padding: .5rem .9rem; border: 1px solid var(--vf-line-strong); border-radius: var(--vf-r-pill); background: #fff; color: var(--vf-graphite-80); text-decoration: none; font-size: var(--vf-fs-sm); font-weight: 500; }
.vf-pills a:hover { border-color: var(--vf-cobalt); color: var(--vf-cobalt); }
.vf-pills a[aria-current] { background: var(--vf-graphite); border-color: var(--vf-graphite); color: #fff; }
.vf-pills small { font-family: var(--vf-font-mono); opacity: .75; }
.vf-pills--nav { display: flex; overflow-x: auto; flex-wrap: nowrap; padding-bottom: .25rem; }
.vf-pills--nav a { white-space: nowrap; }
.vf-fcard { position: relative; display: flex; flex-direction: column; background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); overflow: hidden; transition: box-shadow var(--vf-dur-2), border-color var(--vf-dur-2), transform var(--vf-dur-2); }
.vf-fcard:hover { border-color: var(--vf-cobalt-100); box-shadow: var(--vf-sh-2); transform: translateY(-2px); }
.vf-fcard__draw { position: relative; padding: 1rem 2.5rem .5rem; background: var(--vf-clean); border-bottom: 1px solid var(--vf-line);
  background-image: radial-gradient(circle at 1px 1px, var(--vf-grid-dot) 1px, transparent 1.2px); background-size: 16px 16px; }
.vf-fcard__draw .vf-btl { max-width: 150px; margin-inline: auto; aspect-ratio: 2 / 3; }
.vf-fcard__code, .vf-fcard__vol { position: absolute; top: 10px; font: 600 11px/1 var(--vf-font-mono); letter-spacing: .06em; color: var(--vf-graphite-80); padding: .3rem .45rem; background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-xs); }
.vf-fcard__code { left: 10px; }
.vf-fcard__vol { right: 10px; }
.vf-fcard__body { display: flex; flex-direction: column; gap: .5rem; padding: var(--vf-s-4) var(--vf-s-4) var(--vf-s-4); flex: 1; }
.vf-fcard__grp { margin: 0; font: 600 11px/1.2 var(--vf-font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--vf-muted); }
.vf-fcard__t { margin: 0; font-size: var(--vf-fs-md); line-height: 1.3; }
.vf-fcard__t a { color: var(--vf-graphite); text-decoration: none; }
.vf-fcard__t a:hover { color: var(--vf-cobalt); }
.vf-mtags { display: flex; flex-wrap: wrap; gap: .3rem; list-style: none; margin: 0; }
.vf-mtags li { padding: .15rem .5rem; border-radius: var(--vf-r-sm); background: var(--vf-mint-50); color: var(--vf-mint-ink); font-size: 12px; font-weight: 600; }
.vf-fcard__spec { display: grid; grid-template-columns: repeat(3, 1fr); margin: .25rem 0 0; border: 1px solid var(--vf-line); border-radius: var(--vf-r-sm); }
.vf-fcard__spec > div { padding: .4rem .5rem; border-right: 1px solid var(--vf-line); }
.vf-fcard__spec > div:last-child { border-right: 0; }
.vf-fcard__spec dt { font: 600 10px/1.2 var(--vf-font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--vf-muted); }
.vf-fcard__spec dd { margin: .15rem 0 0; font: 700 var(--vf-fs-xs)/1.2 var(--vf-font-mono); white-space: nowrap; }
.vf-fcard__act { display: flex; justify-content: space-between; align-items: center; gap: .5rem; margin-top: auto; padding-top: .5rem; }

/* ---------------------------------------------------------------- Case study card */
.vf-ccard { position: relative; display: flex; flex-direction: column; background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); overflow: hidden; transition: box-shadow var(--vf-dur-2); }
.vf-ccard:hover { box-shadow: var(--vf-sh-2); }
.vf-ccard__img { position: relative; display: block; aspect-ratio: 3 / 2; background: var(--vf-steel-300); overflow: hidden; }
.vf-ccard__img img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--vf-dur-4) var(--vf-ease); }
.vf-ccard:hover .vf-ccard__img img { transform: scale(1.04); }
.vf-ccard__seg { position: absolute; left: 12px; top: 12px; padding: .25rem .55rem; background: #fff; border-radius: var(--vf-r-pill); font: 600 11px/1.3 var(--vf-font-mono); }
.vf-ccard__body { padding: var(--vf-s-5); display: flex; flex-direction: column; gap: .4rem; flex: 1; }
.vf-ccard__client { margin: 0; font: 600 var(--vf-fs-xs)/1.3 var(--vf-font-mono); color: var(--vf-muted); letter-spacing: .04em; }
.vf-ccard__t { margin: 0; font-size: var(--vf-fs-md); }
.vf-ccard__t a { color: var(--vf-graphite); text-decoration: none; }
.vf-ccard__t a::after { content: ""; position: absolute; inset: 0; }
.vf-ccard__t a:hover { color: var(--vf-cobalt); }
.vf-ccard__res { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; margin: auto 0 0; padding-top: .75rem; border-top: 1px dashed var(--vf-line-strong); }
.vf-ccard__res > div { display: flex; flex-direction: column-reverse; }
.vf-ccard__res dt { font-size: 12px; color: var(--vf-muted); line-height: 1.35; }
.vf-ccard__res dd { margin: 0; font: 700 var(--vf-fs-xl)/1.1 var(--vf-font-display); color: var(--vf-cobalt); }

/* ---------------------------------------------------------------- Nhà máy */
.vf-factory__in { display: grid; gap: var(--vf-s-10); align-items: center; }
@media (min-width: 1024px) { .vf-factory__in { grid-template-columns: 1fr 1fr; gap: var(--vf-s-12); } }
.vf-zones { list-style: none; display: grid; gap: 1px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.12); border-radius: var(--vf-r-md); overflow: hidden; }
@media (min-width: 600px) { .vf-zones { grid-template-columns: 1fr 1fr; } }
.vf-zones li { display: grid; grid-template-columns: auto 1fr; gap: 0 .75rem; padding: .85rem 1rem; background: var(--vf-graphite); }
.vf-zones span { grid-row: span 2; font: 700 var(--vf-fs-sm)/1.3 var(--vf-font-mono); color: var(--vf-mint); }
.vf-zones strong { color: #fff; font-size: var(--vf-fs-sm); }
.vf-zones small { color: var(--vf-on-dark-muted); font-size: 12.5px; line-height: 1.45; }
.vf-mosaic { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
.vf-mosaic figure { margin: 0; border-radius: var(--vf-r-md); overflow: hidden; aspect-ratio: 1; background: var(--vf-graphite-80); }
.vf-mosaic figure:nth-child(1) { aspect-ratio: 4 / 5; }
.vf-mosaic figure:nth-child(4) { aspect-ratio: 4 / 5; margin-top: -25%; }
.vf-mosaic img { width: 100%; height: 100%; object-fit: cover; }
.vf-mosaic--light figure { background: var(--vf-steel-300); }

/* ---------------------------------------------------------------- Logo khách hàng */
.vf-logos { padding-block: clamp(2.5rem, 2rem + 2vw, 4rem); border-block: 1px solid var(--vf-line); background: #fff; }
.vf-logos__t { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem; margin-bottom: var(--vf-s-6); font: 600 var(--vf-fs-sm)/1.4 var(--vf-font-display); }
.vf-logos__t small { font: 500 var(--vf-fs-xs)/1.4 var(--vf-font-body); color: var(--vf-muted); }
.vf-logos__grid { list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--vf-line); border: 1px solid var(--vf-line); }
@media (min-width: 600px) { .vf-logos__grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .vf-logos__grid { grid-template-columns: repeat(6, 1fr); } }
.vf-logos__grid li { display: grid; place-items: center; min-height: 88px; background: #fff; padding: .75rem; }
.vf-clogo { display: inline-flex; align-items: center; gap: .5rem; color: #5B6575; filter: grayscale(1); transition: color var(--vf-dur-2); }
.vf-logos__grid li:hover .vf-clogo { color: var(--vf-graphite); }
.vf-clogo__t { display: flex; flex-direction: column; line-height: 1; }
.vf-clogo b { font: 700 1.05rem/1 var(--vf-font-display); letter-spacing: -.01em; }
.vf-clogo small { font: 500 10px/1.2 var(--vf-font-mono); letter-spacing: .14em; text-transform: uppercase; margin-top: 3px; }

/* ---------------------------------------------------------------- FAQ */
.vf-faq__in { display: grid; gap: var(--vf-s-8); }
@media (min-width: 1024px) { .vf-faq__in { grid-template-columns: .8fr 1.2fr; gap: var(--vf-s-12); } .vf-faq__head { position: sticky; top: calc(var(--vf-header-h) + 24px); align-self: start; } }
.vf-faq__list { border-top: 1px solid var(--vf-line-strong); }
.vf-faq__item { border-bottom: 1px solid var(--vf-line-strong); }
.vf-faq__item summary { display: flex; justify-content: space-between; align-items: center; gap: 1rem; min-height: 60px; padding: 1rem 0; cursor: pointer; list-style: none; font: 600 var(--vf-fs-md)/1.4 var(--vf-font-display); }
.vf-faq__item summary::-webkit-details-marker { display: none; }
.vf-faq__item summary:hover { color: var(--vf-cobalt); }
.vf-faq__ico { width: 22px; height: 22px; flex: none; color: var(--vf-cobalt); transition: transform var(--vf-dur-2); }
.vf-faq__item[open] .vf-faq__ico { transform: rotate(45deg); }
.vf-faq__a { padding: 0 0 1.25rem; color: var(--vf-graphite-80); max-width: 62ch; }
.vf-faq__a p { margin: 0; }

/* ---------------------------------------------------------------- Form */
.vf-card { background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); padding: var(--vf-s-5); }
.vf-card--form { padding: var(--vf-s-6) var(--vf-s-5); box-shadow: var(--vf-sh-2); }
@media (min-width: 768px) { .vf-card--form { padding: var(--vf-s-8); } }
.vf-card__t { font: 700 var(--vf-fs-lg)/1.25 var(--vf-font-display); margin-bottom: .5rem; }
.vf-card__k { font: 600 11px/1 var(--vf-font-mono); color: var(--vf-cobalt); letter-spacing: .08em; }
.vf-card--cta { margin-top: var(--vf-s-6); background: var(--vf-cobalt-50); border-color: var(--vf-cobalt-100); }
.vf-form__title { font: 700 var(--vf-fs-lg)/1.25 var(--vf-font-display); margin-bottom: var(--vf-s-4); }
.vf-form__grid { display: grid; gap: var(--vf-s-4); }
@media (min-width: 600px) { .vf-form__grid { grid-template-columns: 1fr 1fr; } .vf-field--full { grid-column: 1 / -1; } }
.vf-modal .vf-form__grid, .vf-qlead .vf-form__grid { grid-template-columns: 1fr; }
@media (min-width: 600px) { .vf-qlead .vf-form__grid { grid-template-columns: 1fr 1fr; } }
.vf-field { display: flex; flex-direction: column; gap: .35rem; }
.vf-field label { font-weight: 600; font-size: var(--vf-fs-sm); }
.vf-req { color: var(--vf-danger); }
.vf-optl { font-weight: 400; color: var(--vf-muted); font-size: var(--vf-fs-xs); }
.vf-field input, .vf-field select, .vf-field textarea, .vf-searchform input { width: 100%; min-height: 48px; padding: .7rem .85rem; border: 1px solid var(--vf-line-strong); border-radius: var(--vf-r-md); background: #fff; font-size: 16px; color: var(--vf-graphite); transition: border-color var(--vf-dur-1), box-shadow var(--vf-dur-1); }
.vf-field textarea { min-height: 96px; resize: vertical; }
.vf-field input:focus, .vf-field select:focus, .vf-field textarea:focus, .vf-searchform input:focus { border-color: var(--vf-cobalt); box-shadow: 0 0 0 3px rgba(31,79,216,.18); outline: none; }
.vf-field input[type="file"] { padding: .55rem; }
.vf-field input::placeholder, .vf-field textarea::placeholder { color: #7A8496; }
.vf-field.is-invalid input, .vf-field.is-invalid select { border-color: var(--vf-danger); }
.vf-field__err { margin: 0; min-height: 0; color: var(--vf-danger); font-size: var(--vf-fs-xs); font-weight: 600; }
.vf-field__err:empty { display: none; }
.vf-field__help { margin: 0; font-size: var(--vf-fs-xs); color: var(--vf-muted); }
.vf-check { display: flex; gap: .65rem; align-items: flex-start; margin-top: var(--vf-s-4); font-size: var(--vf-fs-xs); line-height: 1.5; color: var(--vf-graphite-80); }
.vf-check input { width: 22px; height: 22px; margin: 1px 0 0; flex: none; accent-color: var(--vf-cobalt); }
.vf-check label { cursor: pointer; }
.vf-check.is-invalid label { color: var(--vf-danger); }
.vf-form__foot { margin-top: var(--vf-s-4); }
.vf-form__note { display: flex; align-items: center; gap: .4rem; margin: .65rem 0 0; font-size: var(--vf-fs-xs); color: var(--vf-muted); }
.vf-form__note .vf-ico { width: 14px; height: 14px; }
.vf-form__status:not(:empty) { margin-top: var(--vf-s-4); padding: .85rem 1rem; border-radius: var(--vf-r-md); font-size: var(--vf-fs-sm); }
.vf-form__status.is-ok { background: var(--vf-mint-50); color: #064E3F; border: 1px solid #A6E3D3; }
.vf-form__status.is-err { background: #FEF0EE; color: var(--vf-danger); border: 1px solid #F6C8C2; }
.vf-form.is-sending button[type="submit"] { opacity: .7; pointer-events: none; }
.vf-form--inline .vf-form__grid { grid-template-columns: 1fr; }
.vf-ticks { list-style: none; display: grid; gap: .6rem; margin: var(--vf-s-4) 0; }
.vf-ticks li { display: flex; gap: .6rem; align-items: flex-start; font-size: var(--vf-fs-sm); }
.vf-ticks .vf-ico { width: 20px; height: 20px; flex: none; color: var(--vf-mint-ink); margin-top: 1px; }
.vf-ticks--lg li { font-size: var(--vf-fs-base); }
.vf-ticks--sm li { font-size: var(--vf-fs-xs); }
.vf-sec--ink .vf-ticks .vf-ico { color: var(--vf-mint); }

.vf-quoteform__in { display: grid; gap: var(--vf-s-8); align-items: start; }
@media (min-width: 1024px) { .vf-quoteform__in { grid-template-columns: .9fr 1.1fr; gap: var(--vf-s-12); } }
.vf-quoteform__alt { margin-top: var(--vf-s-4); }

/* ---------------------------------------------------------------- CTA band + footer */
.vf-ctaband { background: var(--vf-cobalt); color: #fff; padding-block: clamp(2.5rem, 2rem + 2.5vw, 4rem);
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,.18) 1px, transparent 1.2px); background-size: 22px 22px; }
.vf-ctaband__in { display: grid; gap: var(--vf-s-6); align-items: center; }
@media (min-width: 1024px) { .vf-ctaband__in { grid-template-columns: 1.4fr auto; } }
.vf-ctaband__t { font: 700 var(--vf-fs-xl)/1.2 var(--vf-font-display); color: #fff; margin-bottom: .4rem; }
.vf-ctaband p { margin: 0; color: #E3EAFC; }
.vf-ctaband .vf-actions { margin: 0; }

.vf-footer { background: var(--vf-graphite); color: var(--vf-on-dark-muted); padding-top: clamp(3rem, 2rem + 3vw, 5rem); font-size: var(--vf-fs-sm); }
.vf-footer a { color: var(--vf-on-dark); text-decoration: none; }
.vf-footer a:hover { color: #fff; text-decoration: underline; }
.vf-footer__top { display: grid; gap: var(--vf-s-8); }
@media (min-width: 768px) { .vf-footer__top { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1100px) { .vf-footer__top { grid-template-columns: 1.6fr 1fr 1fr 1fr; } }
.vf-footer__desc { margin: var(--vf-s-4) 0; max-width: 34em; }
.vf-footer__contact { list-style: none; display: grid; gap: .55rem; }
.vf-footer__contact li { display: flex; gap: .6rem; align-items: flex-start; }
.vf-footer__contact .vf-ico { width: 18px; height: 18px; margin-top: 2px; color: #8FB0FF; }
.vf-footer__contact strong { color: var(--vf-on-dark); font-weight: 600; }
.vf-footer__h { margin: 0 0 .75rem; font: 600 var(--vf-fs-xs)/1 var(--vf-font-mono); letter-spacing: .12em; text-transform: uppercase; color: #fff; }
.vf-flinks { list-style: none; display: grid; gap: 0; }
.vf-flinks a { display: inline-flex; min-height: 40px; align-items: center; }
.vf-social { display: flex; gap: .5rem; list-style: none; margin-top: var(--vf-s-5); }
.vf-social a { display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid rgba(255,255,255,.18); border-radius: var(--vf-r-md); }
.vf-social a:hover { border-color: #fff; text-decoration: none; }
.vf-footer__certs { list-style: none; display: grid; grid-template-columns: 1fr; gap: .5rem; margin-top: var(--vf-s-10); padding-block: var(--vf-s-6); border-block: 1px solid rgba(255,255,255,.12); }
@media (min-width: 600px) { .vf-footer__certs { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .vf-footer__certs { grid-template-columns: repeat(5, 1fr); } }
.vf-footer__certs li { display: flex; gap: .55rem; align-items: center; font-size: 12.5px; line-height: 1.35; }
.vf-footer__certs .vf-ico { color: var(--vf-mint); width: 22px; height: 22px; }
.vf-footer__certs strong { display: block; color: #fff; font-family: var(--vf-font-display); }
.vf-footer__bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .75rem 2rem; padding-block: var(--vf-s-6) calc(var(--vf-s-6) + var(--vf-mbar-h)); font-size: var(--vf-fs-xs); }
@media (min-width: 768px) { .vf-footer__bottom { padding-bottom: var(--vf-s-6); } }
.vf-footer__bottom p { margin: 0; max-width: 60em; }
.vf-footer__bottom .vf-flinks { display: flex; flex-wrap: wrap; gap: 0 1.25rem; }

/* Thanh CTA dính đáy (mobile) */
.vf-mbar { position: fixed; left: 0; right: 0; bottom: 0; z-index: var(--vf-z-mbar); display: grid; grid-template-columns: 1fr 1fr 1.6fr; gap: 1px; background: var(--vf-line); border-top: 1px solid var(--vf-line); padding-bottom: env(safe-area-inset-bottom); box-shadow: 0 -8px 24px -12px rgba(28,36,48,.3); transition: transform var(--vf-dur-2) var(--vf-ease); }
.vf-mbar a { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; min-height: var(--vf-mbar-h); background: #fff; color: var(--vf-graphite); text-decoration: none; font-size: 12px; font-weight: 600; }
.vf-mbar .vf-ico { width: 22px; height: 22px; color: var(--vf-cobalt); }
.vf-mbar__main { background: var(--vf-cobalt) !important; color: #fff !important; flex-direction: row !important; gap: .45rem !important; font-size: var(--vf-fs-sm) !important; }
.vf-mbar__main .vf-ico { color: #fff; }
.vf-mbar.is-hidden { transform: translateY(110%); }
@media (min-width: 768px) { .vf-mbar { display: none; } }

/* ---------------------------------------------------------------- Modal */
.vf-modal { position: fixed; inset: 0; z-index: var(--vf-z-modal); display: grid; place-items: center; padding: var(--vf-gutter); background: rgba(28,36,48,.6); overflow-y: auto; }
.vf-modal[hidden] { display: none; }
.vf-modal__box { position: relative; width: min(100%, 560px); max-height: calc(100vh - 2rem); overflow-y: auto; background: #fff; border-radius: var(--vf-r-lg); padding: var(--vf-s-8) var(--vf-s-5) var(--vf-s-6); box-shadow: var(--vf-sh-3); animation: vf-fade var(--vf-dur-3) var(--vf-ease); }
@media (min-width: 600px) { .vf-modal__box { padding: var(--vf-s-10) var(--vf-s-8) var(--vf-s-8); } }
.vf-modal--magnet .vf-modal__box { width: min(100%, 820px); }
.vf-modal__x { position: absolute; right: 10px; top: 10px; }
.vf-modal__t { font-size: var(--vf-fs-xl); margin-bottom: .35rem; }
.vf-modal__sub { color: var(--vf-muted); font-size: var(--vf-fs-sm); }
.vf-magnet { display: grid; gap: var(--vf-s-6); }
@media (min-width: 768px) { .vf-magnet { grid-template-columns: 220px 1fr; align-items: start; } }
.vf-magnet__doc { display: none; }
@media (min-width: 768px) { .vf-magnet__doc { position: relative; display: flex; flex-direction: column; justify-content: flex-end; gap: .4rem; aspect-ratio: 3 / 4; padding: 1.25rem; border-radius: var(--vf-r-md); background: var(--vf-graphite); color: #fff; box-shadow: 10px 10px 0 var(--vf-cobalt-100);
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,.16) 1px, transparent 1.2px); background-size: 14px 14px; }
  .vf-magnet__doc span { position: absolute; top: 1rem; left: 1rem; padding: .2rem .45rem; background: var(--vf-mint); color: var(--vf-graphite); font: 700 11px/1 var(--vf-font-mono); border-radius: var(--vf-r-xs); }
  .vf-magnet__doc b { font: 700 var(--vf-fs-lg)/1.2 var(--vf-font-display); }
  .vf-magnet__doc small { color: var(--vf-on-dark-muted); } }

/* ---------------------------------------------------------------- Trang dịch vụ / nhóm */
.vf-pricebox { margin-top: var(--vf-s-8); padding: var(--vf-s-6); border: 1px solid var(--vf-graphite); border-radius: var(--vf-r-lg); background: #fff; position: relative; }
.vf-pricebox::before { content: "PRICE · REF"; position: absolute; top: -9px; left: 16px; padding: 0 .4rem; background: var(--vf-bg); font: 600 10.5px/18px var(--vf-font-mono); letter-spacing: .12em; color: var(--vf-muted); }
.vf-pricebox__k { margin: 0; font-size: var(--vf-fs-xs); color: var(--vf-muted); }
.vf-pricebox__v { margin: .2rem 0 .5rem; font: 700 var(--vf-fs-xl)/1.15 var(--vf-font-display); color: var(--vf-cobalt); }
.vf-pricebox__n { font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); }
.vf-includes { list-style: none; display: grid; gap: 1px; background: var(--vf-line); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); overflow: hidden; }
.vf-includes li { display: grid; grid-template-columns: auto 1fr; gap: 1rem; padding: 1rem 1.15rem; background: #fff; }
.vf-includes__no { font: 700 var(--vf-fs-sm)/1.4 var(--vf-font-mono); color: var(--vf-cobalt); }
.vf-includes h3 { font-size: var(--vf-fs-base); margin: 0 0 .25rem; }
.vf-includes p { margin: 0; font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); }
.vf-hsteps { list-style: none; display: grid; gap: var(--vf-s-4); }
@media (min-width: 700px) { .vf-hsteps { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .vf-hsteps { grid-template-columns: repeat(5, 1fr); } }
.vf-hsteps li { position: relative; display: flex; flex-direction: column; gap: .5rem; padding: var(--vf-s-5); background: var(--vf-clean); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); }
.vf-hsteps__no { font: 700 var(--vf-fs-2xl)/1 var(--vf-font-display); color: var(--vf-cobalt); }
.vf-hsteps h3 { font-size: var(--vf-fs-base); margin: 0; }
.vf-hsteps .vf-tag { align-self: flex-start; }
.vf-hsteps p { margin: 0; font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); }
.vf-specsheet { display: grid; gap: var(--vf-s-8); align-items: center; }
@media (min-width: 1024px) { .vf-specsheet { grid-template-columns: 360px 1fr; gap: var(--vf-s-12); } }
.vf-specsheet__draw { padding: var(--vf-s-6); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background-color: #fff;
  background-image: radial-gradient(circle at 1px 1px, var(--vf-grid-dot) 1px, transparent 1.2px); background-size: 16px 16px; }
.vf-specsheet__draw .vf-btl { max-width: 220px; margin-inline: auto; }
.vf-specsheet__cap { margin: .5rem 0 0; text-align: center; font: 600 11px/1.3 var(--vf-font-mono); color: var(--vf-muted); letter-spacing: .06em; }
.vf-spectable { width: 100%; border-collapse: collapse; font-size: var(--vf-fs-sm); background: #fff; border: 1px solid var(--vf-line); }
.vf-spectable th, .vf-spectable td { text-align: left; padding: .75rem 1rem; border-bottom: 1px solid var(--vf-line); vertical-align: top; }
.vf-spectable th { width: 38%; font: 600 var(--vf-fs-xs)/1.4 var(--vf-font-mono); letter-spacing: .04em; color: var(--vf-muted); background: var(--vf-clean); }
.vf-cards4 { list-style: none; display: grid; gap: var(--vf-s-4); }
@media (min-width: 600px) { .vf-cards4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .vf-cards4 { grid-template-columns: repeat(4, 1fr); } }
.vf-cards4 .vf-card h3 { font-size: var(--vf-fs-base); margin: .5rem 0 .35rem; }
.vf-cards4 .vf-card p { margin: 0; font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); }
.vf-card--usp .vf-ico { width: 28px; height: 28px; color: var(--vf-mint-ink); }
.vf-tablewrap { overflow-x: auto; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; }
.vf-table { width: 100%; min-width: 560px; border-collapse: collapse; font-size: var(--vf-fs-sm); }
.vf-table th, .vf-table td { text-align: left; padding: .8rem 1rem; border-bottom: 1px solid var(--vf-line); vertical-align: top; }
.vf-table thead th { background: var(--vf-graphite); color: #fff; font: 600 var(--vf-fs-xs)/1.3 var(--vf-font-mono); letter-spacing: .06em; text-transform: uppercase; }
.vf-table thead th a { color: #fff; }
.vf-table tbody th { font-weight: 600; }
.vf-table tbody tr:last-child > * { border-bottom: 0; }
.vf-table tbody tr:hover { background: var(--vf-clean); }
.vf-table--compare .is-hl { background: var(--vf-cobalt-50); }
.vf-table--compare thead .is-hl { background: var(--vf-cobalt); }
.vf-table--dodont td:first-child { color: var(--vf-danger); }
.vf-table--dodont td:last-child { color: #064E3F; }

/* Nội dung dài + mục lục */
.vf-longform { display: grid; gap: var(--vf-s-8); }
@media (min-width: 1100px) { .vf-longform { grid-template-columns: 260px minmax(0, 1fr); gap: var(--vf-s-12); } .vf-longform:has(> .vf-prose:only-child) { grid-template-columns: minmax(0, var(--vf-container-text)); } }
.vf-toc { align-self: start; padding: var(--vf-s-5); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; font-size: var(--vf-fs-sm); }
@media (min-width: 1100px) { .vf-toc { position: sticky; top: calc(var(--vf-header-h) + 20px); max-height: calc(100vh - var(--vf-header-h) - 40px); overflow-y: auto; } }
.vf-toc__t { margin: 0 0 .5rem; font: 600 11px/1 var(--vf-font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--vf-muted); }
.vf-toc ol { list-style: none; counter-reset: t; display: grid; }
.vf-toc li { counter-increment: t; }
.vf-toc ol a { display: flex; gap: .5rem; padding: .45rem 0; min-height: 40px; align-items: center; color: var(--vf-graphite-80); text-decoration: none; line-height: 1.35; border-bottom: 1px dashed var(--vf-line); }
.vf-toc ol a::before { content: counter(t, decimal-leading-zero); font: 600 11px/1 var(--vf-font-mono); color: var(--vf-cobalt); }
.vf-toc ol a:hover, .vf-toc ol a.is-active { color: var(--vf-cobalt); }
.vf-toc__cta { margin-top: var(--vf-s-4); padding-top: var(--vf-s-4); border-top: 1px solid var(--vf-line); }
.vf-toc__cta p { margin: 0 0 .5rem; font-weight: 600; }
.vf-prose { max-width: var(--vf-container-text); font-size: 1.0625rem; line-height: 1.75; color: var(--vf-graphite); }
.vf-prose > * + * { margin-top: 1em; }
.vf-prose h2 { font-size: var(--vf-fs-xl); margin: 2em 0 .6em; padding-top: .25em; }
.vf-prose h2:first-child { margin-top: 0; }
.vf-prose h3 { font-size: var(--vf-fs-lg); margin: 1.6em 0 .5em; }
.vf-prose ul, .vf-prose ol { padding-left: 1.4em; }
.vf-prose li + li { margin-top: .35em; }
.vf-prose li::marker { color: var(--vf-cobalt); }
.vf-prose a { font-weight: 500; }
.vf-prose table { width: 100%; border-collapse: collapse; font-size: var(--vf-fs-sm); display: block; overflow-x: auto; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); }
.vf-prose th, .vf-prose td { padding: .65rem .85rem; border-bottom: 1px solid var(--vf-line); text-align: left; vertical-align: top; min-width: 120px; }
.vf-prose thead th { background: var(--vf-clean); font-weight: 600; }
.vf-prose blockquote { margin-inline: 0; padding: 1rem 1.25rem; border-left: 3px solid var(--vf-cobalt); background: var(--vf-cobalt-50); border-radius: 0 var(--vf-r-md) var(--vf-r-md) 0; }
.vf-prose--sm { font-size: var(--vf-fs-base); }
.vf-callout { display: flex; gap: .75rem; margin-top: var(--vf-s-6); padding: 1rem 1.15rem; border: 1px solid #A6E3D3; background: var(--vf-mint-50); border-radius: var(--vf-r-md); font-size: var(--vf-fs-sm); }
.vf-callout .vf-ico { color: var(--vf-mint-ink); width: 22px; height: 22px; flex: none; }
.vf-callout p { margin: 0; }

/* Liên quan */
.vf-related__title { font-size: var(--vf-fs-xl); margin: 0 0 var(--vf-s-5); }
.vf-related__title + .vf-grid, .vf-related__f { margin-bottom: var(--vf-s-10); }
.vf-related--formulas { margin-top: var(--vf-s-10); }
.vf-linkcards { list-style: none; display: grid; gap: .75rem; margin-bottom: var(--vf-s-6); }
@media (min-width: 768px) { .vf-linkcards { grid-template-columns: repeat(3, 1fr); } .vf-linkcards--4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .vf-linkcards--4 { grid-template-columns: repeat(4, 1fr); } }
.vf-linkcard { position: relative; display: flex; flex-direction: column; gap: .25rem; min-height: 88px; padding: 1rem 3rem 1rem 1.1rem; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); background: #fff; color: var(--vf-graphite); text-decoration: none; transition: border-color var(--vf-dur-1); }
.vf-linkcard:hover { border-color: var(--vf-cobalt); color: var(--vf-cobalt); }
.vf-linkcard__k { font: 600 10.5px/1 var(--vf-font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--vf-muted); }
.vf-linkcard .vf-ico { position: absolute; right: 1rem; top: 50%; transform: translateY(-50%); color: var(--vf-cobalt); }

/* Nhóm sản phẩm */
.vf-grp-grid { list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; }
@media (min-width: 768px) { .vf-grp-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1100px) { .vf-grp-grid { grid-template-columns: repeat(4, 1fr); gap: var(--vf-s-5); } }
.vf-grp a { display: flex; flex-direction: column; height: 100%; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); overflow: hidden; background: #fff; color: var(--vf-graphite); text-decoration: none; transition: box-shadow var(--vf-dur-2); }
.vf-grp a:hover { box-shadow: var(--vf-sh-2); }
.vf-grp__img { aspect-ratio: 4 / 3; background: var(--vf-steel-300); overflow: hidden; }
.vf-grp__img img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--vf-dur-4) var(--vf-ease); }
.vf-grp a:hover img { transform: scale(1.05); }
.vf-grp__body { display: flex; flex-direction: column; gap: .35rem; padding: .85rem 1rem 1rem; }
.vf-grp__t { margin: 0; font-size: var(--vf-fs-base); line-height: 1.3; }
.vf-grp a:hover .vf-grp__t { color: var(--vf-cobalt); }
.vf-grp__meta { display: flex; flex-wrap: wrap; gap: .25rem .75rem; font: 600 11.5px/1.3 var(--vf-font-mono); color: var(--vf-muted); }

/* ---------------------------------------------------------------- Thư viện công thức + bộ lọc */
.vf-library__in { display: grid; gap: var(--vf-s-6); }
@media (min-width: 1100px) { .vf-library__in { grid-template-columns: 280px 1fr; gap: var(--vf-s-10); align-items: start; } }
.vf-filter { padding: var(--vf-s-5); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; display: grid; gap: var(--vf-s-5); }
@media (min-width: 1100px) { .vf-filter { position: sticky; top: calc(var(--vf-header-h) + 16px); max-height: calc(100vh - var(--vf-header-h) - 32px); overflow-y: auto; } }
.vf-filter__head { display: flex; justify-content: space-between; align-items: center; }
.vf-filter__t { display: flex; gap: .4rem; align-items: center; margin: 0; font: 700 var(--vf-fs-md)/1 var(--vf-font-display); }
.vf-filter__set { border: 0; margin: 0; padding: 0; min-width: 0; }
.vf-filter__set legend { margin-bottom: .5rem; font: 600 11px/1 var(--vf-font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--vf-muted); }
.vf-filter__opts { display: flex; flex-wrap: wrap; gap: .4rem; }
@media (max-width: 1099px) { .vf-filter__opts { flex-wrap: nowrap; overflow-x: auto; padding-bottom: .25rem; } }
.vf-chip { position: relative; display: inline-flex; }
.vf-chip input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.vf-chip span { display: inline-flex; align-items: center; gap: .3rem; min-height: 40px; padding: .35rem .75rem; border: 1px solid var(--vf-line-strong); border-radius: var(--vf-r-pill); font-size: var(--vf-fs-xs); font-weight: 500; white-space: nowrap; background: #fff; transition: all var(--vf-dur-1); }
.vf-chip small { font-family: var(--vf-font-mono); color: var(--vf-muted); }
.vf-chip input:checked + span { background: var(--vf-graphite); border-color: var(--vf-graphite); color: #fff; }
.vf-chip input:checked + span small { color: var(--vf-on-dark-muted); }
.vf-chip input:focus-visible + span { box-shadow: var(--vf-ring); }
.vf-chip:hover span { border-color: var(--vf-cobalt); }
.vf-js .vf-filter__submit { display: none; }
.vf-results[aria-busy="true"] { opacity: .55; transition: opacity var(--vf-dur-2); }
.vf-results__bar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: .5rem; margin-bottom: var(--vf-s-4); }
.vf-results__n { margin: 0; font-size: var(--vf-fs-sm); color: var(--vf-muted); }
.vf-results__n strong { font: 700 var(--vf-fs-lg)/1 var(--vf-font-display); color: var(--vf-graphite); }
.vf-empty { padding: var(--vf-s-8); border: 1px dashed var(--vf-line-strong); border-radius: var(--vf-r-lg); text-align: center; background: #fff; }
.vf-inline-cta { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 1rem; margin-top: var(--vf-s-8); padding: 1rem 1.25rem; border: 1px solid var(--vf-cobalt-100); background: var(--vf-cobalt-50); border-radius: var(--vf-r-md); }
.vf-inline-cta p { margin: 0; font-size: var(--vf-fs-sm); }
.pagination, .navigation.pagination { margin-top: var(--vf-s-8); }
.nav-links { display: flex; flex-wrap: wrap; gap: .4rem; }
.page-numbers { display: inline-grid; place-items: center; min-width: 44px; min-height: 44px; padding: 0 .75rem; border: 1px solid var(--vf-line-strong); border-radius: var(--vf-r-md); background: #fff; color: var(--vf-graphite); text-decoration: none; font: 600 var(--vf-fs-sm)/1 var(--vf-font-mono); }
.page-numbers.current { background: var(--vf-graphite); border-color: var(--vf-graphite); color: #fff; }
a.page-numbers:hover { border-color: var(--vf-cobalt); color: var(--vf-cobalt); }

/* Chi tiết công thức */
.vf-sheet { display: grid; gap: var(--vf-s-8); align-items: center; }
@media (min-width: 900px) { .vf-sheet { grid-template-columns: 340px 1fr; gap: var(--vf-s-12); } }
.vf-sheet__draw { position: relative; padding: var(--vf-s-6) var(--vf-s-8) var(--vf-s-4); background: #fff; border: 1px solid var(--vf-graphite); border-radius: var(--vf-r-md); }
.vf-sheet__draw .vf-btl { max-width: 220px; margin-inline: auto; }
.vf-sheet__draw--sm { margin-top: var(--vf-s-5); padding: var(--vf-s-5); border-color: var(--vf-line); }
.vf-sheet__draw--sm .vf-btl { max-width: 140px; }
.vf-sheet__ref { display: flex; gap: .5rem; justify-content: center; margin: .5rem 0 0; padding-top: .5rem; border-top: 1px solid var(--vf-line); font: 600 11px/1.2 var(--vf-font-mono); }
.vf-sheet__ref span { color: var(--vf-muted); }
.vf-sheet__kpi { display: grid; grid-template-columns: repeat(3, 1fr); margin: var(--vf-s-6) 0 0; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); background: #fff; }
.vf-sheet__kpi > div { padding: .75rem .85rem; border-right: 1px solid var(--vf-line); }
.vf-sheet__kpi > div:last-child { border-right: 0; }
.vf-sheet__kpi dt { font: 600 10.5px/1.3 var(--vf-font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--vf-muted); }
.vf-sheet__kpi dd { margin: .25rem 0 0; font: 700 var(--vf-fs-md)/1.2 var(--vf-font-display); }
@media (max-width: 599px) { .vf-sheet__kpi { grid-template-columns: 1fr 1fr; } .vf-sheet__kpi > div:nth-child(2) { border-right: 0; } .vf-sheet__kpi > div:last-child { grid-column: 1 / -1; border-top: 1px solid var(--vf-line); } }

/* Case study chi tiết */
.vf-case { display: grid; gap: var(--vf-s-10); }
@media (min-width: 1024px) { .vf-case { grid-template-columns: minmax(0, 1fr) 340px; gap: var(--vf-s-12); align-items: start; } .vf-case__side { position: sticky; top: calc(var(--vf-header-h) + 20px); } }
.vf-case__block { padding-bottom: var(--vf-s-8); margin-bottom: var(--vf-s-8); border-bottom: 1px solid var(--vf-line); }
.vf-case__k { margin: 0 0 .5rem; font: 600 var(--vf-fs-xs)/1 var(--vf-font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--vf-cobalt); }
.vf-case__block h2 { font-size: var(--vf-fs-xl); }
.vf-case__side .vf-specs { margin-top: .5rem; }
.vf-case__side .vf-btn { margin-top: var(--vf-s-4); }
.vf-tl { list-style: none; display: grid; gap: 0; border-left: 2px solid var(--vf-cobalt-100); margin-left: .35rem; }
.vf-tl li { position: relative; padding: 0 0 1rem 1.25rem; }
.vf-tl li::before { content: ""; position: absolute; left: -7px; top: .35rem; width: 12px; height: 12px; border-radius: 50%; background: #fff; border: 2px solid var(--vf-cobalt); }
.vf-tl span { font: 700 var(--vf-fs-xs)/1.3 var(--vf-font-mono); color: var(--vf-cobalt); }
.vf-tl p { margin: .15rem 0 0; font-size: var(--vf-fs-sm); }
.vf-results-list { list-style: none; display: grid; gap: .75rem; }
@media (min-width: 600px) { .vf-results-list { grid-template-columns: repeat(2, 1fr); } }
.vf-results-list li { display: flex; flex-direction: column; padding: 1rem 1.15rem; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); background: #fff; }
.vf-results-list strong { font: 700 var(--vf-fs-2xl)/1.05 var(--vf-font-display); color: var(--vf-cobalt); }
.vf-results-list span { font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); }
.vf-quote { margin: 0; padding: var(--vf-s-6); border-radius: var(--vf-r-lg); background: var(--vf-graphite); color: var(--vf-on-dark); }
.vf-quote > .vf-ico { width: 32px; height: 32px; color: var(--vf-mint); }
.vf-quote blockquote { margin: .75rem 0 1rem; font: 500 var(--vf-fs-lg)/1.45 var(--vf-font-display); color: #fff; }
.vf-quote blockquote p { margin: 0; }
.vf-quote figcaption { display: flex; align-items: center; gap: .75rem; font-size: var(--vf-fs-sm); }
.vf-quote figcaption span { display: flex; flex-direction: column; }
.vf-quote figcaption strong { color: #fff; }
.vf-mono { display: inline-grid; place-items: center; width: var(--s); height: var(--s); flex: none; border-radius: 50%; background: var(--vf-cobalt-50); color: var(--vf-cobalt-800); border: 1px solid var(--vf-cobalt-100); font: 700 calc(var(--s) * .38)/1 var(--vf-font-display); letter-spacing: -.02em; }
.vf-quote .vf-mono { background: rgba(255,255,255,.1); color: #fff; border-color: rgba(255,255,255,.2); }

/* Bài viết */
.vf-article__head { border-bottom: 0; }
.vf-article__img { margin-block: calc(var(--vf-s-8) * -1) 0; }
.vf-article__img img { width: 100%; border-radius: var(--vf-r-lg); aspect-ratio: 16 / 9; object-fit: cover; }
.vf-article__body { padding-block: var(--vf-s-10) var(--vf-s-8); }
.vf-byline { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1rem; margin-top: var(--vf-s-6); font-size: var(--vf-fs-sm); }
.vf-byline p { margin: 0; display: flex; flex-direction: column; line-height: 1.35; }
.vf-byline a { color: var(--vf-graphite); text-decoration: none; }
.vf-byline a:hover { color: var(--vf-cobalt); }
.vf-byline p > span { color: var(--vf-muted); font-size: var(--vf-fs-xs); }
.vf-byline__dates { flex-direction: row !important; flex-wrap: wrap; gap: .25rem 1rem; color: var(--vf-muted); font-size: var(--vf-fs-xs); margin: 0; }
@media (min-width: 768px) { .vf-byline__dates { margin-left: auto !important; } }
.vf-pillarbox { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1rem; max-width: var(--vf-container-text); margin: 0 0 var(--vf-s-8); padding: .85rem 1.1rem; border: 1px solid var(--vf-cobalt-100); background: var(--vf-cobalt-50); border-radius: var(--vf-r-md); }
@media (min-width: 1100px) { .vf-pillarbox { margin-left: calc(260px + var(--vf-s-12)); } }
.vf-pillarbox__k { font: 600 10.5px/1 var(--vf-font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--vf-muted); }
.vf-pillarbox a { display: inline-flex; align-items: center; gap: .4rem; text-decoration: none; min-height: 32px; }
.vf-refs, .vf-authorbox { max-width: var(--vf-container-text); margin-top: var(--vf-s-10); }
@media (min-width: 1100px) { .vf-refs, .vf-authorbox { margin-left: calc(260px + var(--vf-s-12)); } }
.vf-refs h2 { font-size: var(--vf-fs-lg); }
.vf-refs ol { padding-left: 1.3em; font-size: var(--vf-fs-sm); display: grid; gap: .4rem; }
.vf-refs a { display: inline-flex; gap: .3rem; align-items: center; }
.vf-refs .vf-ico { width: 14px; height: 14px; }
.vf-authorbox { display: flex; gap: 1rem; padding: var(--vf-s-6); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; font-size: var(--vf-fs-sm); }
.vf-authorbox__k { margin: 0; font: 600 10.5px/1 var(--vf-font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--vf-muted); }
.vf-authorbox__n { margin: .3rem 0 .4rem; font: 700 var(--vf-fs-md)/1.3 var(--vf-font-display); }
.vf-authorbox__n a { text-decoration: none; }
.vf-authorbox__rev { display: flex; gap: .4rem; align-items: center; margin: 0; font-size: var(--vf-fs-xs); color: var(--vf-mint-ink); }
.vf-authorbox__rev .vf-ico { width: 16px; height: 16px; }

/* Thẻ bài viết */
.vf-pcard { position: relative; display: flex; flex-direction: column; background: #fff; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); overflow: hidden; transition: box-shadow var(--vf-dur-2); }
.vf-pcard:hover { box-shadow: var(--vf-sh-2); }
.vf-pcard__img { display: block; aspect-ratio: 3 / 2; background: var(--vf-steel-300); overflow: hidden; }
.vf-pcard__img img { width: 100%; height: 100%; object-fit: cover; }
.vf-pcard__body { display: flex; flex-direction: column; gap: .45rem; padding: var(--vf-s-5); flex: 1; }
.vf-pcard__meta { display: flex; flex-wrap: wrap; gap: .3rem .75rem; margin: 0; font: 600 11.5px/1.3 var(--vf-font-mono); color: var(--vf-muted); }
.vf-pcard__meta span { color: var(--vf-cobalt); }
.vf-pcard__t { margin: 0; font-size: var(--vf-fs-md); line-height: 1.35; }
.vf-pcard__t a { color: var(--vf-graphite); text-decoration: none; }
.vf-pcard__t a::after { content: ""; position: absolute; inset: 0; }
.vf-pcard__t a:hover { color: var(--vf-cobalt); }
.vf-pcard__ex { margin: 0; font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); }
.vf-pcard__by { display: flex; align-items: center; gap: .5rem; margin: auto 0 0; padding-top: .5rem; font-size: var(--vf-fs-xs); color: var(--vf-muted); }

/* Tác giả, đội ngũ */
.vf-profile { display: grid; gap: var(--vf-s-6); align-items: center; }
@media (min-width: 768px) { .vf-profile { grid-template-columns: auto 1fr; gap: var(--vf-s-10); } }
.vf-people { list-style: none; display: grid; gap: var(--vf-s-5); }
@media (min-width: 768px) { .vf-people { grid-template-columns: repeat(3, 1fr); } }
.vf-person { padding: var(--vf-s-6); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; }
.vf-person h3 { margin: 1rem 0 .2rem; font-size: var(--vf-fs-md); }
.vf-person h3 a { color: var(--vf-graphite); text-decoration: none; }
.vf-person h3 a:hover { color: var(--vf-cobalt); }
.vf-person__role { font: 600 var(--vf-fs-xs)/1.3 var(--vf-font-mono); color: var(--vf-cobalt); }
.vf-person p:last-child { margin: 0; font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); }

/* Tìm kiếm, 404 */
.vf-searchform { display: flex; gap: .5rem; margin-bottom: var(--vf-s-8); }
.vf-searchform input { flex: 1; }
.vf-slist { list-style: none; display: grid; gap: var(--vf-s-5); }
.vf-slist li { padding-bottom: var(--vf-s-5); border-bottom: 1px solid var(--vf-line); }
.vf-slist h2 { font-size: var(--vf-fs-lg); margin: .5rem 0 .25rem; }
.vf-slist h2 a { text-decoration: none; }
.vf-slist p { margin: 0; color: var(--vf-graphite-80); font-size: var(--vf-fs-sm); }
.vf-404__code { margin: 0; font: 700 clamp(5rem, 3rem + 10vw, 9rem)/1 var(--vf-font-display); color: var(--vf-cobalt-100); letter-spacing: -.05em; }
.vf-404 .vf-searchform { margin-top: var(--vf-s-6); }

/* ---------------------------------------------------------------- Báo giá nhanh */
.vf-qwrap { display: grid; gap: var(--vf-s-8); align-items: start; }
@media (min-width: 1100px) { .vf-qwrap { grid-template-columns: minmax(0, 1fr) 360px; gap: var(--vf-s-10); } .vf-qres { position: sticky; top: calc(var(--vf-header-h) + 16px); } }
.vf-qprog { list-style: none; display: flex; gap: .25rem; margin-bottom: var(--vf-s-6); overflow-x: auto; counter-reset: q; }
.vf-qprog li { display: flex; align-items: center; gap: .4rem; flex: 1 0 auto; padding: .5rem .65rem; border-bottom: 3px solid var(--vf-line); font-size: var(--vf-fs-xs); font-weight: 600; color: var(--vf-muted); white-space: nowrap; }
.vf-qprog li span { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; border: 1.5px solid currentColor; font: 700 11px/1 var(--vf-font-mono); }
.vf-qprog li.is-done { color: var(--vf-mint-ink); border-color: var(--vf-mint); }
.vf-qprog li[aria-current] { color: var(--vf-cobalt); border-color: var(--vf-cobalt); }
.vf-qstep { border: 0; margin: 0 0 var(--vf-s-8); padding: 0; min-width: 0; }
.vf-js .vf-qstep { display: none; margin: 0; }
.vf-js .vf-qstep.is-active { display: block; animation: vf-fade var(--vf-dur-3) var(--vf-ease); }
.vf-qstep__t { display: flex; flex-direction: column; gap: .25rem; margin-bottom: var(--vf-s-5); padding: 0; font: 700 var(--vf-fs-xl)/1.25 var(--vf-font-display); color: var(--vf-graphite); }
.vf-qstep__t span { font: 600 var(--vf-fs-xs)/1 var(--vf-font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--vf-cobalt); }
.vf-opts { display: grid; gap: .65rem; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 768px) { .vf-opts--4 { grid-template-columns: repeat(4, 1fr); } .vf-opts--3 { grid-template-columns: repeat(3, 1fr); } .vf-opts--5 { grid-template-columns: repeat(5, 1fr); } }
.vf-opts--2 { grid-template-columns: 1fr; }
@media (min-width: 768px) { .vf-opts--2 { grid-template-columns: 1fr 1fr; } }
.vf-opt { position: relative; display: block; cursor: pointer; }
.vf-opt input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.vf-opt__card { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .25rem; height: 100%; min-height: 64px; padding: .85rem .75rem; border: 1.5px solid var(--vf-line-strong); border-radius: var(--vf-r-md); background: #fff; text-align: center; transition: border-color var(--vf-dur-1), box-shadow var(--vf-dur-1), background var(--vf-dur-1); }
.vf-opt__card strong { font: 600 var(--vf-fs-sm)/1.3 var(--vf-font-display); }
.vf-opt__card small { font-size: 12px; color: var(--vf-muted); }
.vf-opt__card--row { align-items: flex-start; text-align: left; }
.vf-opt__draw { width: 56px; }
.vf-opt__draw .vf-btl__axis { display: none; }
.vf-opt:hover .vf-opt__card { border-color: var(--vf-cobalt); }
.vf-opt input:checked + .vf-opt__card { border-color: var(--vf-cobalt); background: var(--vf-cobalt-50); box-shadow: inset 0 0 0 1px var(--vf-cobalt); }
.vf-opt input:focus-visible + .vf-opt__card { box-shadow: var(--vf-ring); }
.vf-opt input:disabled + .vf-opt__card { opacity: .45; cursor: not-allowed; background: var(--vf-clean); }
.vf-qhint { margin: .75rem 0 0; font-size: var(--vf-fs-xs); color: var(--vf-warn); font-weight: 600; }
.vf-qhint:empty { display: none; }
.vf-qnav { display: flex; justify-content: space-between; gap: .75rem; margin-top: var(--vf-s-6); }
.vf-qnav [data-vf-next] { margin-left: auto; }
.no-js .vf-qnav { display: none; }
.vf-qlead { margin-top: var(--vf-s-4); padding: var(--vf-s-6) var(--vf-s-5); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; }
.vf-qres__box { padding: var(--vf-s-6) var(--vf-s-5); border-radius: var(--vf-r-lg); background: var(--vf-graphite); color: var(--vf-on-dark);
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,.08) 1px, transparent 1.2px); background-size: 18px 18px; }
.vf-qres__k { margin: 0 0 .25rem; font: 600 11px/1 var(--vf-font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--vf-mint); }
.vf-qres__cfg { margin: 0 0 1rem; font-size: var(--vf-fs-sm); color: var(--vf-on-dark-muted); }
.vf-qres__price { display: flex; flex-wrap: wrap; align-items: baseline; gap: .25rem .5rem; padding-bottom: 1rem; border-bottom: 1px solid rgba(255,255,255,.14); }
.vf-qres__l { width: 100%; font-size: var(--vf-fs-xs); color: var(--vf-on-dark-muted); }
.vf-qres__price strong { font: 700 var(--vf-fs-2xl)/1.05 var(--vf-font-display); color: #fff; font-variant-numeric: tabular-nums; }
.vf-qres__u { font-size: var(--vf-fs-sm); color: var(--vf-on-dark-muted); }
.vf-qres__dl { display: grid; gap: .6rem; margin: 1rem 0; }
.vf-qres__dl > div { display: flex; justify-content: space-between; gap: 1rem; font-size: var(--vf-fs-sm); }
.vf-qres__dl dt { color: var(--vf-on-dark-muted); }
.vf-qres__dl dd { margin: 0; font: 700 var(--vf-fs-sm)/1.3 var(--vf-font-mono); color: #fff; text-align: right; }
.vf-qres__bar { height: 6px; border-radius: 3px; background: rgba(255,255,255,.12); overflow: hidden; margin-bottom: 1rem; }
.vf-qres__bar span { display: block; height: 100%; width: var(--w, 20%); background: linear-gradient(90deg, var(--vf-cobalt), var(--vf-mint)); transition: width var(--vf-dur-3) var(--vf-ease); }
.vf-qres__note { font-size: 12px; color: var(--vf-on-dark-muted); }
.vf-qres .vf-ticks { margin-top: var(--vf-s-5); }

/* ---------------------------------------------------------------- Thiết kế bao bì thử */
.vf-pack { display: grid; gap: var(--vf-s-8); align-items: start; }
@media (min-width: 1024px) { .vf-pack { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--vf-s-10); } .vf-pack__view { position: sticky; top: calc(var(--vf-header-h) + 16px); } }
.vf-pack__ctrl { display: grid; gap: var(--vf-s-6); }
.vf-pack__set { border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; padding: var(--vf-s-5); margin: 0; min-width: 0; }
.vf-pack__set legend { display: flex; align-items: center; gap: .5rem; padding: 0 .4rem; font: 700 var(--vf-fs-base)/1.2 var(--vf-font-display); }
.vf-pack__set legend span { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--vf-cobalt); color: #fff; font: 700 12px/1 var(--vf-font-mono); }
.vf-pack__set .vf-field + .vf-field { margin-top: var(--vf-s-4); }
.vf-opts--shapes { grid-template-columns: repeat(2, 1fr); }
@media (min-width: 600px) { .vf-opts--shapes { grid-template-columns: repeat(4, 1fr); } }
.vf-opt--shape .vf-opt__draw { width: 54px; }
.vf-swatches { display: flex; flex-wrap: wrap; gap: .5rem; }
.vf-swatch { position: relative; display: flex; flex-direction: column; align-items: center; gap: .25rem; width: 64px; cursor: pointer; }
.vf-swatch input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.vf-swatch span { width: 44px; height: 44px; border-radius: 50%; background: var(--c); border: 1px solid rgba(28,36,48,.2); box-shadow: inset 0 -6px 10px rgba(0,0,0,.12); }
.vf-swatch em { font-style: normal; font-size: 11.5px; color: var(--vf-graphite-80); text-align: center; line-height: 1.2; }
.vf-swatch input:checked + span { box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--vf-cobalt); }
.vf-swatch input:focus-visible + span { box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--vf-graphite); }
.vf-pack__stage { padding: var(--vf-s-4); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); perspective: 1200px;
  background-color: #fff; background-image: radial-gradient(circle at 1px 1px, var(--vf-grid-dot) 1px, transparent 1.2px); background-size: 20px 20px; }
.vf-pack__spin { transform-style: preserve-3d; }
.vf-pack__spin.is-spin { animation: vf-turn var(--vf-dur-4) var(--vf-ease-io); }
@keyframes vf-turn { 0% { transform: rotateY(0); } 35% { transform: rotateY(-24deg) scale(.98); } 70% { transform: rotateY(14deg); } 100% { transform: rotateY(0); } }
.vf-pack__spin canvas { width: 100%; height: auto; max-width: 480px; margin-inline: auto; aspect-ratio: 4 / 5; }
.vf-pack__cap { margin: .5rem 0 0; text-align: center; font: 600 var(--vf-fs-xs)/1.3 var(--vf-font-mono); color: var(--vf-muted); letter-spacing: .04em; }
.vf-pack .vf-actions { justify-content: center; }

/* ---------------------------------------------------------------- Nhà máy: tour, thiết bị */
.vf-tour { list-style: none; display: grid; gap: var(--vf-s-4); }
@media (min-width: 600px) { .vf-tour { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .vf-tour { grid-template-columns: repeat(4, 1fr); } }
.vf-tour figure { margin: 0; border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); overflow: hidden; background: #fff; height: 100%; }
.vf-tour img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.vf-tour figcaption { display: grid; grid-template-columns: auto 1fr; gap: .1rem .65rem; padding: .85rem 1rem 1rem; }
.vf-tour__no { grid-row: span 2; font: 700 var(--vf-fs-lg)/1 var(--vf-font-display); color: var(--vf-cobalt); }
.vf-tour small { color: var(--vf-graphite-80); font-size: var(--vf-fs-xs); line-height: 1.45; }
.vf-laws { list-style: none; display: grid; gap: .65rem; margin-bottom: var(--vf-s-4); }
.vf-laws li { display: flex; flex-direction: column; padding: .85rem 1rem; border: 1px solid var(--vf-line); border-left: 3px solid var(--vf-cobalt); border-radius: var(--vf-r-sm); background: #fff; }
.vf-laws strong { font-family: var(--vf-font-display); }
.vf-laws span { font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); }
.vf-paysteps { list-style: none; display: grid; gap: .65rem; }
.vf-paysteps li { display: grid; grid-template-columns: 76px 1fr; gap: 0 1rem; padding: .85rem 1rem; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); background: #fff; }
.vf-paysteps strong { grid-row: span 2; font: 700 var(--vf-fs-xl)/1 var(--vf-font-display); color: var(--vf-cobalt); align-self: center; }
.vf-paysteps span { font-weight: 600; }
.vf-paysteps small { color: var(--vf-muted); }
.vf-checklist { list-style: none; display: grid; gap: .4rem; }
.vf-checklist li { display: flex; gap: .65rem; align-items: flex-start; padding: .65rem .85rem; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); background: var(--vf-clean); }
.vf-checklist input { width: 22px; height: 22px; margin: 1px 0 0; flex: none; accent-color: var(--vf-mint-ink); }
.vf-checklist label { display: flex; flex-wrap: wrap; gap: .25rem .5rem; align-items: center; cursor: pointer; font-size: var(--vf-fs-sm); }
.vf-checklist input:checked + label { color: var(--vf-muted); text-decoration: line-through; }

/* Tuyển dụng */
.vf-jobs { display: grid; gap: .75rem; }
.vf-job { border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; }
.vf-job summary { display: grid; grid-template-columns: 1fr auto; gap: .5rem 1rem; align-items: center; padding: 1rem 1.15rem; cursor: pointer; list-style: none; min-height: 64px; }
.vf-job summary::-webkit-details-marker { display: none; }
.vf-job__t { display: flex; flex-direction: column; }
.vf-job__t strong { font: 700 var(--vf-fs-md)/1.3 var(--vf-font-display); }
.vf-job__t small { color: var(--vf-muted); font-size: var(--vf-fs-xs); }
.vf-job__meta { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: .35rem; }
@media (min-width: 900px) { .vf-job summary { grid-template-columns: 1fr auto auto; } .vf-job__meta { grid-column: auto; } }
.vf-job[open] .vf-faq__ico { transform: rotate(45deg); }
.vf-job__body { padding: 0 1.15rem 1.25rem; border-top: 1px dashed var(--vf-line-strong); padding-top: 1rem; }
.vf-job__cols { display: grid; gap: var(--vf-s-5); margin-bottom: var(--vf-s-5); }
@media (min-width: 900px) { .vf-job__cols { grid-template-columns: repeat(3, 1fr); } }
.vf-job__cols h3 { font-size: var(--vf-fs-base); }
.vf-job__cols ul { padding-left: 1.1em; font-size: var(--vf-fs-sm); display: grid; gap: .3rem; }

/* Liên hệ */
.vf-contact { display: grid; gap: var(--vf-s-8); align-items: start; }
@media (min-width: 1024px) { .vf-contact { grid-template-columns: 1fr 1fr; gap: var(--vf-s-12); } }
.vf-cinfo { list-style: none; display: grid; gap: .65rem; margin-bottom: var(--vf-s-6); }
@media (min-width: 600px) { .vf-cinfo { grid-template-columns: 1fr 1fr; } }
.vf-cinfo li { display: flex; gap: .75rem; align-items: center; padding: .85rem 1rem; border: 1px solid var(--vf-line); border-radius: var(--vf-r-md); background: #fff; }
.vf-cinfo .vf-ico { width: 36px; height: 36px; padding: 8px; border-radius: 50%; background: var(--vf-cobalt-50); color: var(--vf-cobalt); }
.vf-cinfo span { display: flex; flex-direction: column; font-weight: 600; font-size: var(--vf-fs-sm); }
.vf-cinfo small { font-weight: 400; color: var(--vf-muted); font-size: 12px; }
.vf-cinfo a { text-decoration: none; }
.vf-office { padding: var(--vf-s-5); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; margin-bottom: var(--vf-s-4); }
.vf-office__t { font-size: var(--vf-fs-lg); margin-bottom: .5rem; }
.vf-office p { display: flex; gap: .5rem; align-items: flex-start; font-size: var(--vf-fs-sm); margin-bottom: .4rem; }
.vf-office .vf-ico { width: 18px; height: 18px; color: var(--vf-cobalt); margin-top: 2px; }
.vf-map { position: relative; margin-top: var(--vf-s-4); aspect-ratio: 16 / 9; border-radius: var(--vf-r-md); overflow: hidden; border: 1px solid var(--vf-line);
  background-color: var(--vf-clean); background-image: radial-gradient(circle at 1px 1px, var(--vf-grid-dot) 1px, transparent 1.2px), linear-gradient(135deg, transparent 48%, var(--vf-cobalt-100) 48% 52%, transparent 52%); background-size: 18px 18px, 100% 100%; }
.vf-map iframe { width: 100%; height: 100%; border: 0; }
.vf-map__btn { position: absolute; inset: 0; margin: auto; width: max-content; height: 48px; display: inline-flex; align-items: center; gap: .5rem; padding: 0 1.1rem; border: 1px solid var(--vf-cobalt); border-radius: var(--vf-r-pill); background: #fff; color: var(--vf-cobalt); font-weight: 600; }
.vf-map__btn:hover { background: var(--vf-cobalt); color: #fff; }

/* Tài liệu */
.vf-docs { display: grid; gap: var(--vf-s-8); align-items: start; }
@media (min-width: 1024px) { .vf-docs { grid-template-columns: 1.2fr .8fr; gap: var(--vf-s-12); } }
.vf-doclist { list-style: none; display: grid; gap: .75rem; }
.vf-doc { display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: start; padding: var(--vf-s-5); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; }
@media (min-width: 600px) { .vf-doc { grid-template-columns: auto 1fr auto; align-items: center; } }
.vf-doc__icon { display: grid; place-items: center; width: 56px; height: 72px; border-radius: var(--vf-r-sm); background: var(--vf-graphite); position: relative; }
.vf-doc__icon span { font: 700 12px/1 var(--vf-font-mono); color: var(--vf-mint); }
.vf-doc__icon::after { content: ""; position: absolute; top: 0; right: 0; border-style: solid; border-width: 0 14px 14px 0; border-color: transparent var(--vf-bg) var(--vf-line-strong) transparent; }
.vf-doc__t { font-size: var(--vf-fs-md); margin: 0 0 .25rem; }
.vf-doc p { margin: 0; font-size: var(--vf-fs-sm); color: var(--vf-graphite-80); }
.vf-doc__meta { margin-top: .35rem !important; font: 600 11.5px/1.3 var(--vf-font-mono) !important; color: var(--vf-muted) !important; }
.vf-doc .vf-chip { grid-column: 2; justify-self: start; }
@media (min-width: 600px) { .vf-doc .vf-chip { grid-column: auto; } }
.vf-dl { display: grid; gap: .5rem; margin-top: var(--vf-s-4); }
.vf-dl a { display: flex; align-items: center; gap: .5rem; min-height: 48px; padding: .6rem .9rem; border: 1px solid var(--vf-mint); border-radius: var(--vf-r-md); background: var(--vf-mint-50); color: #064E3F; font-weight: 600; text-decoration: none; }
.vf-magnet-band { display: grid; gap: var(--vf-s-6); align-items: center; padding: var(--vf-s-6); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; }
@media (min-width: 1024px) { .vf-magnet-band { grid-template-columns: 1fr 1.1fr; gap: var(--vf-s-10); padding: var(--vf-s-8); } }
.vf-magnet-band p { margin: 0; color: var(--vf-graphite-80); }

/* Chính sách */
.vf-policy { display: grid; gap: var(--vf-s-6); }
@media (min-width: 1100px) { .vf-policy { grid-template-columns: 240px minmax(0, 1fr); gap: var(--vf-s-10); } .vf-policy .vf-longform { grid-template-columns: minmax(0, 1fr); } .vf-policy .vf-toc { display: none; } }
.vf-policy__nav { align-self: start; padding: var(--vf-s-5); border: 1px solid var(--vf-line); border-radius: var(--vf-r-lg); background: #fff; }
@media (min-width: 1100px) { .vf-policy__nav { position: sticky; top: calc(var(--vf-header-h) + 20px); } }
.vf-policy__nav ul { list-style: none; display: grid; }
.vf-policy__nav a { display: flex; align-items: center; min-height: 44px; color: var(--vf-graphite-80); text-decoration: none; border-bottom: 1px dashed var(--vf-line); font-size: var(--vf-fs-sm); }
.vf-policy__nav a[aria-current] { color: var(--vf-cobalt); font-weight: 600; }

/* WooCommerce khung */
.vf-woo-crumb { padding-top: var(--vf-s-5); }
.vf-woo-title { font-size: var(--vf-fs-2xl); }

/* Hiệu ứng xuất hiện (chỉ khi JS + không reduced-motion) */
.vf-js .vf-reveal { opacity: 0; transform: translateY(14px); transition: opacity var(--vf-dur-3) var(--vf-ease), transform var(--vf-dur-3) var(--vf-ease); }
.vf-js .vf-reveal.is-in { opacity: 1; transform: none; }

/* ---------------------------------------------------------------- Màn hình lớn 1920 */
@media (min-width: 1680px) {
  :root { --vf-container: 1360px; }
  .vf-hero__h1 { font-size: 4.25rem; }
}

/* ---------------------------------------------------------------- In */
@media print { .vf-topbar, .vf-header, .vf-mbar, .vf-footer, .vf-ctaband, .vf-modal, .vf-toc__cta, .vf-actions { display: none !important; } body { background: #fff; } }