/* KÍNH. Aluminium & Glass — CSS thuần, mobile-first. Token ở tokens.css */

/* ---------- Font tự host: latin + vietnamese ---------- */
@font-face{font-family:"Inter Tight";font-weight:400 700;font-display:swap;src:url(../fonts/intertight-vietnamese.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Inter Tight";font-weight:400 700;font-display:swap;src:url(../fonts/intertight-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Be Vietnam Pro";font-weight:400;font-display:swap;src:url(../fonts/bevn-400-vietnamese.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-weight:400;font-display:swap;src:url(../fonts/bevn-400-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Be Vietnam Pro";font-weight:600;font-display:swap;src:url(../fonts/bevn-600-vietnamese.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-weight:600;font-display:swap;src:url(../fonts/bevn-600-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"JetBrains Mono";font-weight:400 600;font-display:swap;src:url(../fonts/jbmono-vietnamese.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"JetBrains Mono";font-weight:400 600;font-display:swap;src:url(../fonts/jbmono-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

/* ---------- Nền tảng ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--kn-hd) + 12px)}
@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body{margin:0;background:var(--kn-white);color:var(--kn-ink);font:400 16px/var(--kn-lh) var(--kn-font-body);-webkit-font-smoothing:antialiased;overflow-x:clip}
img,video,svg,iframe,canvas{max-width:100%;height:auto;display:block}
img{background:var(--kn-white-2)}
a{color:var(--kn-ink);text-underline-offset:3px;text-decoration-thickness:1px;text-decoration-color:var(--kn-alu)}
a:hover{color:var(--kn-copper-d);text-decoration-color:currentColor}
h1,h2,h3,h4{font-family:var(--kn-font-head);font-weight:600;line-height:1.12;margin:0 0 .5em;letter-spacing:-.015em;text-wrap:balance}
h1{font-size:var(--kn-fs-6)}
h1 em,h2 em{font-style:normal;font-weight:400;color:var(--kn-copper-d)}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--kn-copper-d);outline-offset:3px}
.screen-reader-text{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.kn-skip{position:absolute;left:-999px;top:8px;background:var(--kn-ink);color:#fff;padding:8px 14px;z-index:300;border-radius:var(--kn-r)}
.kn-skip:focus{left:8px}
.kn-wrap{width:100%;max-width:var(--kn-wrap);margin-inline:auto;padding-inline:var(--kn-gutter)}
.kn-narrow{max-width:800px}
.kn-sec{padding:var(--kn-s-8) 0}
.kn-sec--tight{padding:var(--kn-s-7) 0}
.kn-sec--alt{background:var(--kn-white-2)}
.kn-sec--dark{background:var(--kn-ink);color:#E9EDF0}
.kn-sec--dark a{color:#fff}
@media(min-width:900px){.kn-sec{padding:var(--kn-s-9) 0}.kn-sec--tight{padding:var(--kn-s-8) 0}}
.kn-mono{font-family:var(--kn-font-mono);font-weight:500;letter-spacing:-.01em;font-variant-numeric:tabular-nums}
.kn-eyebrow{font:600 var(--kn-fs-0)/1.4 var(--kn-font-head);letter-spacing:var(--kn-track);text-transform:uppercase;color:var(--kn-copper-d);margin:0 0 14px}
.kn-eyebrow a{text-decoration:none;color:inherit}
.kn-h2{font-size:var(--kn-fs-5)}
.kn-h3{font-size:var(--kn-fs-4)}
.kn-head{max-width:720px;margin:0 0 var(--kn-s-6)}
.kn-head .kn-h2{margin-bottom:.4em}
.kn-lead{font-size:var(--kn-fs-3);color:var(--kn-ink-2);max-width:64ch}
.kn-head--light .kn-lead{color:#C4CCD3}
.kn-head--light .kn-eyebrow,.kn-head--light em{color:#D9A86C}
.kn-more{margin:var(--kn-s-6) 0 0;text-align:center}
.kn-note{font-size:var(--kn-fs-1);color:var(--kn-ink-2);margin-top:var(--kn-s-5)}
.kn-upd{font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.kn-ul{list-style:none}.kn-ul li{padding:4px 0 4px 16px;position:relative}.kn-ul li::before{content:"";position:absolute;left:0;top:14px;width:8px;height:1.5px;background:var(--kn-copper)}
.kn-ol{padding-left:22px}.kn-ol li{margin-bottom:8px}
.kn-checks{list-style:none;margin:0 0 var(--kn-s-5)}
.kn-checks li{padding:8px 0 8px 28px;position:relative;border-bottom:1px solid var(--kn-line)}
.kn-checks li::before{content:"";position:absolute;left:2px;top:15px;width:14px;height:7px;border-left:1.5px solid var(--kn-copper);border-bottom:1.5px solid var(--kn-copper);transform:rotate(-45deg)}
.kn-sec--dark .kn-checks li{border-color:rgba(255,255,255,.14)}

/* ---------- Nút ---------- */
.kn-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 24px;border-radius:var(--kn-r);background:var(--kn-ink);color:#fff;border:1px solid var(--kn-ink);font:600 var(--kn-fs-1)/1.2 var(--kn-font-head);letter-spacing:.02em;text-decoration:none;cursor:pointer;transition:background var(--kn-fast),color var(--kn-fast),border-color var(--kn-fast)}
.kn-btn:hover{background:#2A2F36;border-color:#2A2F36;color:#fff}
.kn-btn--copper{background:var(--kn-copper-d);border-color:var(--kn-copper-d);color:#fff} /* đồng đậm: tương phản 5,4:1 với chữ trắng */
.kn-btn--copper:hover{background:#744D1F;border-color:#744D1F}
.kn-btn--line{background:transparent;color:var(--kn-ink);border-color:var(--kn-ink)}
.kn-btn--line:hover{background:var(--kn-ink);color:#fff}
.kn-btn--line-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.7)}
.kn-btn--line-light:hover{background:#fff;color:var(--kn-ink);border-color:#fff}
.kn-btn--sm{min-height:44px;padding:8px 16px;font-size:var(--kn-fs-0)}
.kn-btn--block{display:flex;width:100%;margin-top:12px}
.kn-btn[disabled]{opacity:.5;cursor:default}
.kn-link{background:none;border:0;padding:0;color:var(--kn-copper-d);text-decoration:underline;cursor:pointer;min-height:44px}

/* ---------- Header: trong suốt → trắng khi cuộn ---------- */
.kn-hd{position:sticky;top:0;z-index:100;background:rgba(250,251,252,.92);border-bottom:1px solid var(--kn-line);transition:background var(--kn-med),border-color var(--kn-med)}
.kn-hd::before{content:"";position:absolute;inset:0;z-index:-1;backdrop-filter:blur(10px) saturate(1.1);-webkit-backdrop-filter:blur(10px) saturate(1.1)}
.kn-hd--clear:not(.is-scrolled){background:transparent;border-color:transparent}
.kn-hd--clear:not(.is-scrolled)::before{backdrop-filter:none;-webkit-backdrop-filter:none}
.kn-hd__in{display:flex;align-items:center;justify-content:space-between;height:var(--kn-hd);gap:16px}
.kn-logo{display:inline-flex;align-items:center;gap:10px;color:var(--kn-ink);text-decoration:none}
.kn-logo b{display:block;font:700 1.3rem/1 var(--kn-font-head);letter-spacing:.06em}
.kn-logo b i{color:var(--kn-copper);font-style:normal}
.kn-logo small{display:block;font:500 .62rem/1.2 var(--kn-font-head);letter-spacing:var(--kn-track);text-transform:uppercase;color:var(--kn-ink-2);margin-top:3px}
.kn-logo--light,.kn-logo--light small{color:#E9EDF0}
.kn-burger{display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:44px;height:44px;padding:0 11px;background:none;border:1px solid var(--kn-line);border-radius:var(--kn-r);cursor:pointer}
.kn-burger i{display:block;height:1.5px;background:var(--kn-ink);transition:transform var(--kn-fast),opacity var(--kn-fast)}
.kn-burger[aria-expanded=true] i:nth-child(2){transform:translateY(6.5px) rotate(45deg)}
.kn-burger[aria-expanded=true] i:nth-child(3){opacity:0}
.kn-burger[aria-expanded=true] i:nth-child(4){transform:translateY(-6.5px) rotate(-45deg)}
.kn-nav{position:fixed;top:var(--kn-hd);right:0;bottom:0;width:100%;background:var(--kn-white);padding:12px var(--kn-gutter) 100px;overflow:auto;transform:translateX(100%);visibility:hidden;transition:transform var(--kn-med) var(--kn-ease),visibility var(--kn-med)}
.kn-nav.is-open{transform:none;visibility:visible}
.kn-nav>ul{list-style:none}
.kn-nav>ul>li{border-bottom:1px solid var(--kn-line);display:flex;flex-wrap:wrap;align-items:center}
.kn-nav>ul>li>a{flex:1;display:block;padding:14px 0;color:var(--kn-ink);text-decoration:none;font:600 1.05rem/1.3 var(--kn-font-head)}
.kn-nav__tg{width:44px;height:44px;margin-left:8px;border:0;background:none;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:transform var(--kn-fast)}
.kn-nav__tg[aria-expanded=true]{transform:rotate(180deg)}
.kn-sub{list-style:none;flex-basis:100%;display:none;padding:0 0 10px 12px}
.kn-sub.is-open{display:block}
.kn-sub a{display:block;padding:10px 0;font-size:var(--kn-fs-1);text-decoration:none;color:var(--kn-ink-2)}
.kn-sub a:hover{color:var(--kn-copper-d)}
.kn-nav__ctas{display:flex;flex-direction:column;gap:12px;margin-top:20px}
.kn-nav__tel{text-decoration:none;font-size:1.1rem}
@media(min-width:1080px){
  .kn-burger{display:none}
  .kn-nav{position:static;width:auto;padding:0;overflow:visible;transform:none;visibility:visible;background:none;display:flex;align-items:center;gap:22px}
  .kn-nav>ul{display:flex;gap:4px;align-items:center}
  .kn-nav>ul>li{border:0;position:relative;flex-wrap:nowrap}
  .kn-nav>ul>li>a{padding:8px 10px;font:500 var(--kn-fs-1)/1.3 var(--kn-font-body)}
  .kn-nav__tg{width:22px;height:44px;margin-left:-8px;color:var(--kn-ink-2)}
  .kn-sub{display:block;position:absolute;top:100%;left:0;min-width:280px;padding:10px 16px;background:var(--kn-white);border:1px solid var(--kn-line);border-radius:var(--kn-r);opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity var(--kn-fast),transform var(--kn-fast),visibility var(--kn-fast)}
  .has-sub:hover .kn-sub,.has-sub:focus-within .kn-sub,.kn-sub.is-open{opacity:1;visibility:visible;transform:none}
  .kn-sub a{padding:9px 0;border-bottom:1px solid var(--kn-line);font-size:var(--kn-fs-1);color:var(--kn-ink)}
  .kn-sub li:last-child a{border:0}
  .kn-nav__ctas{flex-direction:row;align-items:center;margin:0;gap:16px}
  .kn-nav__tel{font-size:var(--kn-fs-1)}
}

/* ---------- Breadcrumb, đầu trang trong ---------- */
.kn-crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:4px 8px;font-size:var(--kn-fs-0);color:var(--kn-ink-2);margin-bottom:14px}
.kn-crumbs li+li::before{content:"/";margin-right:8px;color:var(--kn-alu)}
.kn-crumbs a{text-decoration:none;color:var(--kn-ink-2)}
.kn-crumbs a:hover{color:var(--kn-copper-d)}
.kn-phero{padding:var(--kn-s-6) 0 var(--kn-s-7);border-bottom:1px solid var(--kn-line);background:linear-gradient(180deg,var(--kn-white-2),var(--kn-white))}
.kn-phero__in{display:grid;gap:var(--kn-s-6);align-items:center}
.kn-phero__txt{max-width:720px}
.kn-phero__txt--wide{max-width:900px}
.kn-phero h1{font-size:clamp(1.9rem,4.4vw,3.3rem)}
.kn-phero__img img{width:100%;aspect-ratio:3/2;object-fit:cover;border-radius:var(--kn-r)}
.kn-phero__price{font-size:var(--kn-fs-3);margin:8px 0 18px}
.kn-phero__price strong{font-size:1.4rem}
.kn-phero__price small{display:block;color:var(--kn-ink-2);font-size:var(--kn-fs-0)}
.kn-phero__code{font-size:.6em;color:var(--kn-ink-2);vertical-align:middle;margin-left:8px;letter-spacing:.04em}
.kn-phero--tool{padding-bottom:var(--kn-s-5)}
@media(min-width:900px){.kn-phero{padding:var(--kn-s-7) 0 var(--kn-s-8)}.kn-phero.has-img .kn-phero__in{grid-template-columns:1.1fr .9fr}}
.kn-facts{display:flex;flex-wrap:wrap;gap:12px 28px;margin:16px 0 0;padding-top:16px;border-top:1px solid var(--kn-line)}
.kn-facts div{display:flex;flex-direction:column}
.kn-facts dt{font-size:var(--kn-fs-0);text-transform:uppercase;letter-spacing:.08em;color:var(--kn-ink-2)}
.kn-facts dd{margin:0;font-weight:600}

/* ---------- Hero trang chủ ---------- */
.kn-hero{position:relative;min-height:min(100svh,920px);display:flex;align-items:flex-end;isolation:isolate;overflow:clip;margin-top:calc(var(--kn-hd) * -1);padding-top:var(--kn-hd)}
.kn-hero__scene{position:absolute;inset:0;z-index:-1}
.kn-hero__bg,.kn-hero__bg img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.kn-hero__door{position:absolute;inset:0;width:100%;height:100%}
.kn-hero__leaf{transform-box:fill-box;transform-origin:0 50%;will-change:transform}
.kn-hero__in{position:relative;padding:var(--kn-s-7) var(--kn-gutter) 72px}
.kn-hero__in>*{position:relative}
.kn-hero__in::before{content:"";position:absolute;inset:16px -16px 40px;background:rgba(250,251,252,.72);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.6);border-radius:var(--kn-r);z-index:0}
.kn-hero h1{max-width:18ch;margin-bottom:.4em}
.kn-hero h1 em{display:block}
.kn-hero__lead{font-size:clamp(1rem,1.4vw,1.2rem);max-width:56ch;color:var(--kn-ink-2)}
.kn-hero__btns{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}
.kn-hero__chips{list-style:none;display:flex;flex-wrap:wrap;gap:8px 20px;font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.kn-hero__chips li::before{content:"";display:inline-block;width:14px;height:1.5px;background:var(--kn-copper);margin-right:8px;vertical-align:middle}
.kn-hero__hint{position:absolute;right:var(--kn-gutter);bottom:0;font:500 var(--kn-fs-0)/1 var(--kn-font-head);letter-spacing:var(--kn-track);text-transform:uppercase;color:var(--kn-ink-2);margin:0}
.kn-hero__hint::after{content:"";display:block;width:1.5px;height:28px;background:var(--kn-copper);margin:10px auto 0;animation:kn-drop 1.8s var(--kn-ease) infinite}
@keyframes kn-drop{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}
@media(min-width:900px){.kn-hero__in{padding:var(--kn-s-9) var(--kn-gutter) 90px;max-width:min(var(--kn-wrap),100%);width:100%}.kn-hero__in::before{inset:48px auto 60px -32px;width:min(640px,70%)}}
@media(prefers-reduced-motion:reduce){.kn-hero__hint::after{animation:none}.kn-hero__leaf{transform:none!important;opacity:.35}}

/* ---------- Dải tin cậy ---------- */
.kn-trust{background:var(--kn-ink);color:#E9EDF0;padding:var(--kn-s-6) 0}
.kn-trust ul{list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:24px 16px}
.kn-trust li{border-left:1px solid rgba(255,255,255,.2);padding-left:16px}
.kn-num{display:block;font:600 clamp(1.8rem,4vw,2.8rem)/1 var(--kn-font-head);color:#fff;margin-bottom:6px;letter-spacing:-.02em}
.kn-num .kn-count{font-family:var(--kn-font-mono);font-weight:500}
.kn-trust li>span{font-size:var(--kn-fs-1);color:#C4CCD3}
@media(min-width:800px){.kn-trust ul{grid-template-columns:repeat(4,1fr)}}

/* ---------- Ô sản phẩm (bản vẽ SVG) ---------- */
.kn-types{list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--kn-line);border:1px solid var(--kn-line)}
.kn-type{display:flex;flex-direction:column;height:100%;background:var(--kn-white);padding:18px 16px 16px;text-decoration:none;color:var(--kn-ink);position:relative;transition:background var(--kn-fast)}
.kn-type:hover{background:var(--kn-glass-2)}
.kn-type__d{aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.kn-draw{width:100%;height:auto;overflow:visible}
.kn-draw--tile{max-height:160px}
.kn-type h3{font-size:var(--kn-fs-3);margin:0 0 4px}
.kn-type p{font-size:var(--kn-fs-1);color:var(--kn-ink-2);margin:0 0 10px;flex:1}
.kn-type__p{font-size:var(--kn-fs-0);color:var(--kn-copper-d)}
@media(min-width:700px){.kn-types{grid-template-columns:repeat(4,1fr)}.kn-type{padding:24px 20px 20px}}
.kn-types--4{grid-template-columns:repeat(2,1fr)}
@media(min-width:700px){.kn-types--4{grid-template-columns:repeat(4,1fr)}}

/* ánh sáng quét qua kính khi hover */
.kn-glint{position:relative;overflow:hidden}
.kn-glint::after{content:"";position:absolute;top:-20%;bottom:-20%;left:-60%;width:40%;background:linear-gradient(100deg,transparent 0%,rgba(255,255,255,.55) 50%,transparent 100%);transform:skewX(-18deg);pointer-events:none;opacity:0}
.kn-glint:hover::after{animation:kn-glint var(--kn-slow) var(--kn-ease) 1}
@keyframes kn-glint{0%{left:-60%;opacity:1}100%{left:130%;opacity:1}}
@media(prefers-reduced-motion:reduce){.kn-glint:hover::after{animation:none}}

/* ---------- Hệ nhôm ---------- */
.kn-sys{list-style:none;display:grid;gap:16px}
.kn-sys__a{display:block;height:100%;background:var(--kn-white);border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:22px;text-decoration:none;color:var(--kn-ink);transition:border-color var(--kn-fast)}
.kn-sys__a:hover{border-color:var(--kn-ink)}
.kn-sys__code{font-size:var(--kn-fs-0);color:var(--kn-ink-2);letter-spacing:.06em}
.kn-sys h3{font-size:var(--kn-fs-4);margin:6px 0 8px}
.kn-sys p{font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.kn-sys__p{display:block;margin-top:14px;font-size:var(--kn-fs-1)}
@media(min-width:700px){.kn-sys{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1100px){.kn-sys{grid-template-columns:repeat(4,1fr)}}

/* spec sheet hai cột */
.kn-spec{margin:0}
.kn-spec>div{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:10px 0;border-bottom:1px solid var(--kn-line)}
.kn-spec dt{color:var(--kn-ink-2);font-size:var(--kn-fs-1)}
.kn-spec dd{margin:0;text-align:right;font-weight:500}
.kn-spec--mini>div{padding:6px 0;font-size:var(--kn-fs-0)}
.kn-spec--mini dd{font-size:var(--kn-fs-0)}
.kn-spec__tot{font-weight:600;border-bottom:2px solid var(--kn-ink)!important}
.kn-spec__tot dd{font-size:var(--kn-fs-3)}

/* ---------- Vì sao kín ---------- */
.kn-why{display:grid;gap:var(--kn-s-6);align-items:start}
.kn-xsec{width:100%;height:auto}
.kn-why__list{list-style:none;counter-reset:x}
.kn-why__list li{display:grid;grid-template-columns:40px 1fr;gap:12px;padding:14px 0;border-top:1px solid var(--kn-line)}
.kn-why__list .kn-mono{color:var(--kn-copper-d);font-size:var(--kn-fs-1);padding-top:4px}
.kn-why__list h3{font-size:var(--kn-fs-3);margin:0 0 4px}
.kn-why__list p{margin:0;font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
@media(min-width:960px){.kn-why{grid-template-columns:1fr 1fr;gap:var(--kn-s-8)}.kn-why__svg{position:sticky;top:calc(var(--kn-hd) + 24px)}}

/* ---------- Lưới & thẻ ---------- */
.kn-grid3{display:grid;gap:24px}
.kn-grid2{display:grid;gap:24px}
@media(min-width:640px){.kn-grid3{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.kn-grid3{grid-template-columns:repeat(3,1fr)}.kn-grid2{grid-template-columns:repeat(2,1fr)}}
.kn-two{display:grid;gap:var(--kn-s-6);align-items:start}
@media(min-width:900px){.kn-two{grid-template-columns:1fr 1fr;gap:var(--kn-s-8)}.kn-two--rev>*:first-child{order:2}}
.kn-card{background:var(--kn-white);border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:22px;display:flex;flex-direction:column;gap:8px}
.kn-card h3{font-size:var(--kn-fs-3);margin:0}
.kn-card p{font-size:var(--kn-fs-1);color:var(--kn-ink-2);margin:0}
.kn-card .kn-btn{margin-top:auto;align-self:flex-start}
.kn-card__img img{aspect-ratio:4/3;object-fit:cover;width:100%;border-radius:var(--kn-r)}
.kn-card--sys{padding:0;overflow:hidden}
.kn-card--sys .kn-card__img img{border-radius:0}
.kn-card__b{padding:22px;display:flex;flex-direction:column;gap:8px;flex:1}
.kn-card--sys h2{font-size:var(--kn-fs-4);margin:0}
.kn-draw-box{border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:24px;background:var(--kn-white)}

/* dự án */
.kn-pj__a{display:block;text-decoration:none;color:inherit;border-radius:var(--kn-r)}
.kn-pj__a img{aspect-ratio:4/3;object-fit:cover;width:100%;border-radius:var(--kn-r)}
.kn-pj__meta{position:absolute;left:12px;right:12px;bottom:12px;display:flex;justify-content:space-between;gap:8px;font-size:var(--kn-fs-0)}
.kn-pj__meta span{background:rgba(250,251,252,.9);padding:5px 9px;border-radius:var(--kn-r);backdrop-filter:blur(4px)}
.kn-pj__t{font-size:var(--kn-fs-3);margin:14px 0 4px}
.kn-pj__t a{text-decoration:none}
.kn-pj__s{font-size:var(--kn-fs-1);color:var(--kn-ink-2);margin:0}
/* bài viết */
.kn-posts{display:grid;gap:28px}
@media(min-width:700px){.kn-posts{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.kn-posts{grid-template-columns:repeat(3,1fr)}}
.kn-post__img{display:block;border-radius:var(--kn-r)}
.kn-post__img img{aspect-ratio:3/2;object-fit:cover;width:100%;border-radius:var(--kn-r)}
.kn-post__b{padding-top:14px}
.kn-post__m{font-size:var(--kn-fs-0);color:var(--kn-ink-2);margin-bottom:6px;text-transform:uppercase;letter-spacing:.06em}
.kn-post__m a{text-decoration:underline;text-underline-offset:2px;color:var(--kn-copper-d)}
.kn-post h2,.kn-post h3{font-size:var(--kn-fs-3);margin:0 0 8px}
.kn-post h2 a,.kn-post h3 a{text-decoration:none}
.kn-post p{font-size:var(--kn-fs-1);color:var(--kn-ink-2);margin:0}
.kn-post__au{margin-top:8px!important;font-size:var(--kn-fs-0)!important}

/* ---------- Quy trình ---------- */
.kn-steps{list-style:none;display:grid;gap:1px;background:var(--kn-line);border:1px solid var(--kn-line)}
.kn-step{background:var(--kn-white);padding:22px}
.kn-step__n{color:var(--kn-copper-d);font-size:var(--kn-fs-1);display:block;margin-bottom:12px}
.kn-step h3{font-size:var(--kn-fs-3);margin:0 0 6px}
.kn-step p{font-size:var(--kn-fs-1);color:var(--kn-ink-2);margin:0}
.kn-step__t{margin-top:10px!important;color:var(--kn-ink)!important;font-family:var(--kn-font-mono);font-size:var(--kn-fs-0)!important}
@media(min-width:640px){.kn-steps{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.kn-steps{grid-template-columns:repeat(3,1fr)}.kn-steps--4{grid-template-columns:repeat(4,1fr)}}

/* ---------- Xưởng / video ---------- */
.kn-ws{display:grid;gap:var(--kn-s-6);align-items:center}
@media(min-width:960px){.kn-ws{grid-template-columns:1.2fr 1fr;gap:var(--kn-s-8)}}
.kn-video{position:relative;margin:0;border-radius:var(--kn-r);overflow:hidden;background:#000}
.kn-video img,.kn-video video{aspect-ratio:16/9;object-fit:cover;width:100%}
.kn-video__play{position:absolute;inset:0;margin:auto;width:72px;height:72px;border-radius:50%;border:1.5px solid #fff;background:rgba(21,24,28,.45);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background var(--kn-fast)}
.kn-video__play:hover{background:var(--kn-copper)}
.kn-video__play span{width:0;height:0;border-left:20px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:5px}
.kn-video figcaption{position:absolute;left:12px;bottom:12px;font-size:var(--kn-fs-0);color:#fff;background:rgba(21,24,28,.55);padding:4px 10px;border-radius:var(--kn-r)}

/* ---------- Cảm nhận ---------- */
.kn-reviews{display:grid;gap:16px}
@media(min-width:700px){.kn-reviews{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.kn-reviews{grid-template-columns:repeat(3,1fr)}}
.kn-rv{margin:0;border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:22px;background:var(--kn-white);display:flex;flex-direction:column}
.kn-stars{color:var(--kn-copper);letter-spacing:2px;font-size:var(--kn-fs-1)}
.kn-rv blockquote{margin:10px 0 16px;flex:1}
.kn-rv blockquote p{margin:0;font-size:var(--kn-fs-2)}
.kn-rv figcaption{display:flex;gap:12px;align-items:center;font-size:var(--kn-fs-0);color:var(--kn-ink-2)}
.kn-rv figcaption strong{color:var(--kn-ink)}
.kn-rv__av img{width:44px;height:44px;border-radius:50%;object-fit:cover}

/* ---------- FAQ ---------- */
.kn-faq__in{max-width:860px}
.kn-faq__list details{border-top:1px solid var(--kn-line)}
.kn-faq__list details:last-child{border-bottom:1px solid var(--kn-line)}
.kn-faq__list summary{list-style:none;cursor:pointer;padding:18px 44px 18px 0;position:relative;min-height:44px}
.kn-faq__list summary::-webkit-details-marker{display:none}
.kn-faq__list summary h3{display:inline;font-size:var(--kn-fs-3);margin:0;font-weight:600}
.kn-faq__list summary::after{content:"";position:absolute;right:8px;top:26px;width:10px;height:10px;border-right:1.5px solid var(--kn-ink);border-bottom:1.5px solid var(--kn-ink);transform:rotate(45deg);transition:transform var(--kn-fast)}
.kn-faq__list details[open] summary::after{transform:rotate(-135deg);top:30px}
.kn-faq__a{padding:0 0 20px;color:var(--kn-ink-2);max-width:70ch}

/* ---------- CTA, form ---------- */
.kn-cta{background:var(--kn-ink);color:#E9EDF0;padding:var(--kn-s-8) 0}
.kn-cta__in{display:grid;gap:24px;align-items:center}
.kn-cta .kn-h2{color:#fff;margin-bottom:.3em}
.kn-cta p{color:#C4CCD3;max-width:60ch;margin:0}
.kn-cta__btns{display:flex;flex-wrap:wrap;gap:12px}
@media(min-width:900px){.kn-cta__in{grid-template-columns:1.4fr 1fr}.kn-cta__btns{justify-content:flex-end}}
.kn-form{background:var(--kn-white);border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:24px}
.kn-form__t{font-size:var(--kn-fs-4);margin:0 0 16px}
.kn-fields{display:grid;gap:14px}
@media(min-width:600px){.kn-fields{grid-template-columns:1fr 1fr}.kn-fields__full{grid-column:1/-1}}
.kn-fields label{display:flex;flex-direction:column;gap:6px;font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.kn-fields input,.kn-fields select,.kn-fields textarea,.kn-search input{min-height:48px;padding:10px 12px;border:1px solid var(--kn-alu);border-radius:var(--kn-r);background:#fff;color:var(--kn-ink);width:100%}
.kn-fields textarea{min-height:88px;resize:vertical}
.kn-fields input:focus,.kn-fields select:focus,.kn-fields textarea:focus{border-color:var(--kn-ink);outline-offset:0}
.kn-consent{display:flex;gap:10px;align-items:flex-start;font-size:var(--kn-fs-0);color:var(--kn-ink-2);margin-top:14px;min-height:44px}
.kn-consent input{width:20px;height:20px;margin:2px 0 0;accent-color:var(--kn-copper)}
.kn-hp{position:absolute;left:-9999px}
.kn-form__msg{min-height:1.4em;font-size:var(--kn-fs-1);color:var(--kn-err);margin:10px 0 0}
.kn-form__msg.is-ok{color:var(--kn-ok)}
.kn-form__note{font-size:var(--kn-fs-0);color:var(--kn-ink-2);margin:12px 0 0}
.kn-form__sum{font-size:var(--kn-fs-1);color:var(--kn-ink-2);padding:10px 12px;background:var(--kn-white-2);border-radius:var(--kn-r)}
.kn-book__in{display:grid;gap:var(--kn-s-6);align-items:start}
@media(min-width:960px){.kn-book__in{grid-template-columns:1fr 1.1fr;gap:var(--kn-s-8)}}

/* ---------- Bản đồ facade ---------- */
.kn-map{aspect-ratio:4/3;border:1px solid var(--kn-line);border-radius:var(--kn-r);overflow:hidden;background:var(--kn-glass-2)}
.kn-map iframe{width:100%;height:100%;border:0}
.kn-map__btn{width:100%;height:100%;border:0;background:radial-gradient(circle at 50% 40%,rgba(255,255,255,.9),var(--kn-glass-2));display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding:20px;text-align:center;cursor:pointer;color:var(--kn-ink)}
.kn-map__btn span{font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.kn-map__btn small{font-size:var(--kn-fs-0);color:var(--kn-ink-2)}
.kn-map__pin{width:18px;height:18px;border:1.5px solid var(--kn-copper);border-radius:50% 50% 50% 0;transform:rotate(-45deg);margin-bottom:8px}

/* ---------- Bảng ---------- */
.kn-tscroll{overflow-x:auto;-webkit-overflow-scrolling:touch;background:linear-gradient(90deg,var(--kn-white) 30%,rgba(250,251,252,0)) left/40px 100% no-repeat,linear-gradient(270deg,var(--kn-white) 30%,rgba(250,251,252,0)) right/40px 100% no-repeat,linear-gradient(90deg,rgba(21,24,28,.14),rgba(21,24,28,0)) left/14px 100% no-repeat,linear-gradient(270deg,rgba(21,24,28,.14),rgba(21,24,28,0)) right/14px 100% no-repeat;background-attachment:local,local,scroll,scroll;border-radius:var(--kn-r)}
.kn-sec--alt .kn-tscroll{background-image:linear-gradient(90deg,var(--kn-white-2) 30%,rgba(241,244,246,0)),linear-gradient(270deg,var(--kn-white-2) 30%,rgba(241,244,246,0)),linear-gradient(90deg,rgba(21,24,28,.14),rgba(21,24,28,0)),linear-gradient(270deg,rgba(21,24,28,.14),rgba(21,24,28,0))}
.kn-table{width:100%;border-collapse:collapse;font-size:var(--kn-fs-1);min-width:560px}
.kn-table th,.kn-table td{padding:10px 12px;border-bottom:1px solid var(--kn-line);text-align:left;vertical-align:top}
.kn-table thead th{font:600 var(--kn-fs-0)/1.3 var(--kn-font-head);letter-spacing:.06em;text-transform:uppercase;color:var(--kn-ink-2);border-bottom:1.5px solid var(--kn-ink)}
.kn-table tbody th{font-weight:600}
.kn-table small{color:var(--kn-ink-2)}
.kn-table a{text-decoration:none;color:var(--kn-ink)}
.kn-table a:hover{color:var(--kn-copper-d)}
.kn-yes{color:var(--kn-copper-d)}.kn-no{color:var(--kn-alu)}
.kn-table--compat td{text-align:center}
.kn-table--cmp td[data-col],.kn-table--cmp th[data-col]{display:none}
.kn-table--cmp td.is-on,.kn-table--cmp th.is-on{display:table-cell}
.kn-table--cmp{min-width:0}
.kn-table--cmp .kn-ul li{font-size:var(--kn-fs-0)}
.kn-compare__sw{display:flex;flex-wrap:wrap;gap:10px 22px;margin-bottom:12px}
.kn-switch{display:inline-flex;align-items:center;gap:10px;cursor:pointer;min-height:44px;font-size:var(--kn-fs-1)}
.kn-switch input{position:absolute;opacity:0;width:1px;height:1px}
.kn-switch__t{width:40px;height:22px;border-radius:11px;background:var(--kn-alu);position:relative;transition:background var(--kn-fast);flex:none}
.kn-switch__t::after{content:"";position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;background:#fff;transition:transform var(--kn-fast)}
.kn-switch input:checked+.kn-switch__t{background:var(--kn-copper)}
.kn-switch input:checked+.kn-switch__t::after{transform:translateX(18px)}
.kn-switch input:focus-visible+.kn-switch__t{outline:2px solid var(--kn-copper-d);outline-offset:3px}
.kn-switch input:disabled+.kn-switch__t{opacity:.4}

/* ---------- Chip, phân trang, tìm kiếm ---------- */
.kn-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:var(--kn-s-6)}
.kn-chip{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:8px 14px;border:1px solid var(--kn-line);border-radius:var(--kn-r);text-decoration:none;font-size:var(--kn-fs-1);color:var(--kn-ink);background:var(--kn-white)}
.kn-chip .kn-mono{color:var(--kn-ink-2);font-size:var(--kn-fs-0)}
.kn-chip:hover{border-color:var(--kn-ink)}
.kn-chip.is-on{background:var(--kn-ink);color:#fff;border-color:var(--kn-ink)}
.kn-chip.is-on .kn-mono{color:#C4CCD3}
.kn-pillars{margin-bottom:var(--kn-s-7);padding:20px;border:1px solid var(--kn-copper);border-radius:var(--kn-r)}
.kn-pillars ul{list-style:none;display:grid;gap:16px}
@media(min-width:700px){.kn-pillars ul{grid-template-columns:1fr 1fr}}
.kn-pillars a{text-decoration:none;display:block}
.kn-pillars strong{display:block;font-family:var(--kn-font-head);font-size:var(--kn-fs-3);margin-bottom:4px}
.kn-pillars span{font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.pagination{margin-top:var(--kn-s-7)}
.nav-links{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.nav-links .page-numbers{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:0 12px;border:1px solid var(--kn-line);border-radius:var(--kn-r);text-decoration:none;font-family:var(--kn-font-mono)}
.nav-links .current{background:var(--kn-ink);color:#fff;border-color:var(--kn-ink)}
.kn-search{display:flex;gap:8px;max-width:560px;margin-bottom:var(--kn-s-6)}
.kn-search input{flex:1}
.kn-results{list-style:none}
.kn-results li{padding:20px 0;border-bottom:1px solid var(--kn-line)}
.kn-results h2{font-size:var(--kn-fs-4);margin:0 0 6px}
.kn-results h2 a{text-decoration:none}
.kn-results p{margin:0;color:var(--kn-ink-2);font-size:var(--kn-fs-1)}
.kn-results .kn-eyebrow{margin-bottom:6px}

/* ---------- 404 ---------- */
.kn-404{padding:var(--kn-s-8) 0}
.kn-404__in{display:grid;gap:var(--kn-s-7);align-items:center}
@media(min-width:900px){.kn-404__in{grid-template-columns:1.2fr 1fr}}
.kn-404__links{list-style:none;display:flex;flex-wrap:wrap;gap:8px 20px}
.kn-404__d{max-width:380px;margin:auto}

/* ---------- Nội dung bài ---------- */
.kn-prose{font-size:1.04rem}
.kn-prose>*+*{margin-top:1.1em}
.kn-prose h2{font-size:var(--kn-fs-5);margin-top:1.8em;scroll-margin-top:calc(var(--kn-hd) + 20px)}
.kn-prose h3{font-size:var(--kn-fs-4);margin-top:1.5em;scroll-margin-top:calc(var(--kn-hd) + 20px)}
.kn-prose ul,.kn-prose ol{padding-left:22px}
.kn-prose li{margin-bottom:.4em}
.kn-prose img{border-radius:var(--kn-r)}
.kn-prose table{width:100%;border-collapse:collapse;font-size:var(--kn-fs-1)}
.kn-prose th,.kn-prose td{padding:8px 10px;border-bottom:1px solid var(--kn-line);text-align:left}
.kn-prose thead th{border-bottom:1.5px solid var(--kn-ink);font-size:var(--kn-fs-0);text-transform:uppercase;letter-spacing:.06em}
.kn-prose blockquote{margin:0;padding:12px 20px;border-left:1.5px solid var(--kn-copper);color:var(--kn-ink-2)}
.kn-prose .kn-tscroll{margin-top:1.1em}
.kn-prose figure{margin:1.4em 0}
.kn-prose figcaption{font-size:var(--kn-fs-0);color:var(--kn-ink-2);margin-top:6px}
.kn-article__img{margin-top:var(--kn-s-6)}
.kn-article__img img{width:100%;aspect-ratio:21/9;object-fit:cover;border-radius:var(--kn-r)}
.kn-article__grid{display:grid;gap:var(--kn-s-7);padding:var(--kn-s-7) var(--kn-gutter)}
@media(min-width:1000px){.kn-article__grid{grid-template-columns:minmax(0,1fr) 320px;gap:var(--kn-s-8)}.kn-article__side{position:sticky;top:calc(var(--kn-hd) + 20px);align-self:start}}
.kn-byline{font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.kn-byline a{font-weight:600;text-decoration:none}
.kn-pillar-link{padding:12px 16px;background:var(--kn-glass-2);border-radius:var(--kn-r);font-size:var(--kn-fs-1)}
.kn-refs{margin-top:2.2em;padding-top:1.2em;border-top:1px solid var(--kn-line);font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.kn-refs h2{font-size:var(--kn-fs-3);margin-top:0}
.kn-toc{margin-bottom:28px}
.kn-toc ol{list-style:none;border-left:1px solid var(--kn-line)}
.kn-toc a{display:block;padding:6px 14px;font-size:var(--kn-fs-1);text-decoration:none;color:var(--kn-ink-2);border-left:1.5px solid transparent;margin-left:-1px}
.kn-toc a.is-on,.kn-toc a:hover{color:var(--kn-ink);border-color:var(--kn-copper)}
.kn-toc[hidden]{display:none}
.kn-side-cta{margin-top:28px;padding:20px;border:1px solid var(--kn-line);border-radius:var(--kn-r)}
.kn-side-cta p{margin:0 0 8px;font-size:var(--kn-fs-1)}
.kn-relp{margin-top:28px}
.kn-relp .kn-h3{font-size:var(--kn-fs-3)}
.kn-relp ul{list-style:none}
.kn-relp>ul>li{border-top:1px solid var(--kn-line)}
.kn-relp>ul>li>a{display:grid;grid-template-columns:72px 1fr;gap:14px;align-items:center;padding:10px 0;text-decoration:none}
.kn-relp .kn-draw--tile{max-height:54px}
.kn-relp strong{display:block;font-size:var(--kn-fs-1)}
.kn-relp small{color:var(--kn-ink-2);font-size:var(--kn-fs-0)}
.kn-relp__posts li{border-top:1px solid var(--kn-line)}
.kn-relp__posts a{display:block;padding:10px 0;text-decoration:none;font-size:var(--kn-fs-1)}
.kn-author{display:grid;grid-template-columns:72px 1fr;gap:18px;padding:24px 0;border-top:1px solid var(--kn-line);border-bottom:1px solid var(--kn-line);margin-top:var(--kn-s-6)}
.kn-author__av{width:72px;height:72px;border-radius:50%;overflow:hidden;background:var(--kn-glass);display:flex;align-items:center;justify-content:center;font:600 1.6rem var(--kn-font-head)}
.kn-author__av img{width:100%;height:100%;object-fit:cover}
.kn-author__n{margin:0 0 6px;font-family:var(--kn-font-head);font-size:var(--kn-fs-3);font-weight:600}
.kn-author__n a{text-decoration:none}
.kn-author__n span{display:block;font:400 var(--kn-fs-1)/1.4 var(--kn-font-body);color:var(--kn-ink-2)}
.kn-author__bio{font-size:var(--kn-fs-1);color:var(--kn-ink-2);margin:0 0 8px}
.kn-author__c{list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.kn-author__c li{font-size:var(--kn-fs-0);padding:4px 10px;border:1px solid var(--kn-line);border-radius:var(--kn-r)}
.kn-author--full{border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:24px;margin-top:0}
.kn-team{display:grid;gap:20px}
@media(min-width:900px){.kn-team{grid-template-columns:1fr 1fr}}
.kn-certs{list-style:none;display:grid;gap:1px;background:var(--kn-line);border:1px solid var(--kn-line)}
.kn-certs li{background:var(--kn-white);padding:22px}
.kn-certs h3{font-size:var(--kn-fs-3);margin:0 0 6px}
.kn-certs p{margin:0;font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
@media(min-width:640px){.kn-certs{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.kn-certs{grid-template-columns:repeat(3,1fr)}}
.kn-jobs{display:grid;gap:12px}
.kn-job{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center;padding:22px;border:1px solid var(--kn-line);border-radius:var(--kn-r)}
.kn-job h2{margin:0 0 4px}
.kn-job__m{font-size:var(--kn-fs-1);color:var(--kn-ink-2);margin:0 0 6px}
.kn-job p:last-child{margin:0;font-size:var(--kn-fs-1)}
.kn-places{display:grid;gap:16px;margin-top:24px}
.kn-place{font-style:normal;padding:18px;border:1px solid var(--kn-line);border-radius:var(--kn-r)}
.kn-place h2{font-size:var(--kn-fs-3);margin:0 0 6px}
.kn-place p{margin:0;font-size:var(--kn-fs-1);color:var(--kn-ink-2)}

/* ---------- Trước / sau ---------- */
.kn-ba{position:relative;margin:0;--p:50%;border-radius:var(--kn-r);overflow:hidden;aspect-ratio:3/2;background:var(--kn-white-2)}
.kn-ba img{width:100%;height:100%;object-fit:cover;aspect-ratio:3/2}
.kn-ba__after,.kn-ba__before{position:absolute;inset:0}
.kn-ba__before{clip-path:inset(0 calc(100% - var(--p)) 0 0)}
.kn-ba__bar{position:absolute;top:0;bottom:0;left:var(--p);width:2px;background:#fff;transform:translateX(-1px);pointer-events:none}
.kn-ba__bar i{position:absolute;top:50%;left:50%;width:44px;height:44px;margin:-22px;border-radius:50%;background:var(--kn-ink);border:2px solid #fff}
.kn-ba__bar i::before,.kn-ba__bar i::after{content:"";position:absolute;top:16px;width:7px;height:7px;border-top:1.5px solid #fff;border-left:1.5px solid #fff}
.kn-ba__bar i::before{left:10px;transform:rotate(-45deg)}.kn-ba__bar i::after{right:10px;transform:rotate(135deg)}
.kn-ba__tag{position:absolute;top:12px;font:600 var(--kn-fs-0)/1 var(--kn-font-head);letter-spacing:var(--kn-track);text-transform:uppercase;padding:6px 10px;background:rgba(21,24,28,.6);color:#fff;border-radius:var(--kn-r)}
.kn-ba__tag--l{left:12px}.kn-ba__tag--r{right:12px}
.kn-ba input[type=range]{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:ew-resize}
.kn-ba figcaption{position:absolute;left:12px;bottom:12px;font-size:var(--kn-fs-0);color:#fff;background:rgba(21,24,28,.55);padding:4px 10px;border-radius:var(--kn-r)}
.kn-gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
@media(min-width:700px){.kn-gallery{grid-template-columns:repeat(3,1fr)}}
.kn-gallery a{display:block;border-radius:var(--kn-r)}
.kn-gallery img{aspect-ratio:4/3;object-fit:cover;width:100%;border-radius:var(--kn-r)}
.kn-modal{border:0;padding:0;background:transparent;max-width:min(96vw,1200px);max-height:92vh}
.kn-modal::backdrop{background:rgba(21,24,28,.85)}
.kn-modal img{max-height:88vh;width:auto;max-width:96vw;margin:auto;border-radius:var(--kn-r)}
.kn-modal__x{position:fixed;top:12px;right:12px;width:44px;height:44px;border-radius:50%;border:0;background:#fff;font-size:26px;line-height:1;cursor:pointer;z-index:2}
.kn-modal--form{background:var(--kn-white);max-width:620px;width:94vw;border-radius:var(--kn-r)}
.kn-modal--form .kn-form{border:0}
.kn-modal--form .kn-modal__x{position:absolute;background:var(--kn-white-2)}

/* ---------- Footer, CTA dính ---------- */
.kn-ft{background:var(--kn-ink);color:#C4CCD3;padding:var(--kn-s-8) 0 120px;font-size:var(--kn-fs-1)}
.kn-ft a{color:#E9EDF0;text-decoration:none}
.kn-ft a:hover{color:#D9A86C}
.kn-ft__grid{display:grid;gap:var(--kn-s-6)}
@media(min-width:700px){.kn-ft__grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1100px){.kn-ft__grid{grid-template-columns:1.5fr 1fr 1fr 1fr 1.3fr}.kn-ft{padding-bottom:var(--kn-s-7)}}
.kn-ft__brand p{margin-top:16px}
.kn-ft__legal{font-size:var(--kn-fs-0);color:#8E98A3}
.kn-ft__h{font:600 var(--kn-fs-0)/1.4 var(--kn-font-head);letter-spacing:var(--kn-track);text-transform:uppercase;color:#fff;margin:0 0 14px}
.kn-ft ul{list-style:none}
.kn-ft li{padding:4px 0}
.kn-ft__addr{font-style:normal;margin-bottom:14px;font-size:var(--kn-fs-0)}
.kn-ft__addr strong{color:#fff}
.kn-ft__bar{margin-top:var(--kn-s-7);padding-top:var(--kn-s-5);border-top:1px solid rgba(255,255,255,.14);font-size:var(--kn-fs-0);color:#8E98A3}
.kn-ft__pol{display:flex;flex-wrap:wrap;gap:6px 20px;margin-bottom:12px}
.kn-sticky{position:fixed;left:0;right:0;bottom:0;z-index:90;display:grid;grid-template-columns:1fr 1fr 1.4fr;background:rgba(250,251,252,.96);border-top:1px solid var(--kn-line);backdrop-filter:blur(8px);padding-bottom:env(safe-area-inset-bottom)}
.kn-sticky a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:56px;font:600 var(--kn-fs-0)/1 var(--kn-font-head);text-decoration:none;color:var(--kn-ink);letter-spacing:.04em}
.kn-sticky a.is-main{background:var(--kn-copper-d);color:#fff}
@media(min-width:1100px){.kn-sticky{display:none}}

/* ---------- Công cụ: cấu hình cửa ---------- */
.kn-cfg{padding:var(--kn-s-5) 0 var(--kn-s-8)}
.kn-cfg__in{display:grid;gap:var(--kn-s-6)}
@media(min-width:1000px){.kn-cfg__in{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:var(--kn-s-7);align-items:start}.kn-cfg__stage{position:sticky;top:calc(var(--kn-hd) + 12px)}}
.kn-cfg__svg{border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:16px;background:var(--kn-white);min-height:260px;display:flex;align-items:center}
.kn-cfg__svg svg{width:100%;height:auto;max-height:52vh}
.kn-cfg__cap{font-size:var(--kn-fs-1);color:var(--kn-ink-2);margin:8px 0 16px}
.kn-cfg__sum{border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:20px;background:var(--kn-white)}
.kn-cfg__tot{display:flex;flex-direction:column;margin-bottom:14px}
.kn-cfg__tot span{font-size:var(--kn-fs-0);letter-spacing:var(--kn-track);text-transform:uppercase;color:var(--kn-ink-2)}
.kn-cfg__tot strong{font-size:clamp(1.6rem,3vw,2.2rem);line-height:1.1;margin:4px 0}
.kn-cfg__tot small{color:var(--kn-ink-2);font-size:var(--kn-fs-0)}
.kn-cfg__br{margin:0 0 16px}
.kn-cfg__br>div{display:flex;justify-content:space-between;gap:12px;padding:6px 0;border-top:1px solid var(--kn-line);font-size:var(--kn-fs-1)}
.kn-cfg__br dt{color:var(--kn-ink-2)}.kn-cfg__br dd{margin:0}
.kn-cfg__acts .kn-btn{width:100%}
.kn-cfg__acts2{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:8px}
.kn-cfg__acts2 .kn-btn{padding-inline:8px;text-align:center}
.kn-cfg__msg{min-height:1.2em;font-size:var(--kn-fs-0);color:var(--kn-ok);margin:8px 0 0}
.kn-cfg__panel{display:grid;gap:8px}
.kn-cfg__step{border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:18px;margin:0;min-width:0}
.kn-cfg__step legend{font:600 var(--kn-fs-3)/1.2 var(--kn-font-head);padding:0 6px;display:flex;gap:10px;align-items:center}
.kn-cfg__step legend .kn-mono{color:var(--kn-copper-d);font-size:var(--kn-fs-0)}
.kn-cfg__hint{font-size:var(--kn-fs-0);color:var(--kn-ink-2);margin:10px 0 0}
.kn-cfg__hint a{color:var(--kn-copper-d)}
.kn-opts{display:grid;gap:8px}
.kn-opts label{display:flex;gap:10px;align-items:center;border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:10px 12px;cursor:pointer;min-height:44px;position:relative;transition:border-color var(--kn-fast),background var(--kn-fast)}
.kn-opts label:hover{border-color:var(--kn-alu)}
.kn-opts input{position:absolute;opacity:0;width:1px;height:1px}
.kn-opts label:has(input:checked){border-color:var(--kn-ink);background:var(--kn-glass-2)}
.kn-opts label:has(input:focus-visible){outline:2px solid var(--kn-copper-d);outline-offset:2px}
.kn-opts label:has(input:disabled),.kn-opts label.is-off{opacity:.38;cursor:not-allowed}
.kn-opts label[hidden]{display:none}
.kn-opts--draw{grid-template-columns:repeat(2,1fr)}
.kn-opts--draw label{flex-direction:column;align-items:stretch;text-align:center;font-size:var(--kn-fs-1);padding:10px}
.kn-opt__d{display:block;height:72px}
.kn-opt__d svg{height:100%;width:100%}
@media(min-width:600px){.kn-opts--draw{grid-template-columns:repeat(3,1fr)}}
.kn-opts--col label>span{display:flex;flex-direction:column;gap:2px}
.kn-opts--col strong{font-size:var(--kn-fs-1)}
.kn-opts--col small{font-size:var(--kn-fs-0);color:var(--kn-ink-2)}
.kn-opts--col label::before{content:"";width:18px;height:18px;border-radius:50%;border:1.5px solid var(--kn-alu);flex:none}
.kn-opts--col label:has(input[type=checkbox])::before{border-radius:var(--kn-r)}
.kn-opts--col label:has(input:checked)::before{border-color:var(--kn-ink);background:radial-gradient(circle,var(--kn-ink) 42%,transparent 46%)}
.kn-opts--col label:has(input[type=checkbox]:checked)::before{background:var(--kn-ink) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 6.2l2.3 2.3 4.7-4.8' fill='none' stroke='%23fff' stroke-width='1.6'/%3E%3C/svg%3E") center/12px no-repeat}
.kn-opts--pill{display:flex;flex-wrap:wrap}
.kn-opts--pill label{padding:8px 14px;font-size:var(--kn-fs-1)}
.kn-size{display:grid;gap:14px}
@media(min-width:600px){.kn-size{grid-template-columns:1fr 1fr}}
.kn-size label{display:grid;gap:6px;font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.kn-size input[type=number]{min-height:48px;padding:8px 12px;border:1px solid var(--kn-alu);border-radius:var(--kn-r);font-size:1.15rem;width:100%}
.kn-size input[type=range]{width:100%;accent-color:var(--kn-copper);min-height:28px}
.kn-swatches{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
@media(min-width:600px){.kn-swatches{grid-template-columns:repeat(6,1fr)}}
.kn-swatchw{display:flex;flex-direction:column;align-items:center;gap:8px;cursor:pointer;position:relative;min-height:44px}
.kn-swatchw input{position:absolute;opacity:0;width:1px;height:1px}
.kn-swatch{width:56px;height:56px;border-radius:var(--kn-r);border:1px solid var(--kn-line);background:repeating-linear-gradient(90deg,var(--c) 0 2px,var(--c2) 2px 3px),var(--c);background-blend-mode:multiply;position:relative;transition:transform var(--kn-fast)}
.kn-swatch::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.25),transparent 55%)}
.kn-swatchw:has(input:checked) .kn-swatch{outline:2px solid var(--kn-ink);outline-offset:3px}
.kn-swatchw:has(input:focus-visible) .kn-swatch{outline:2px solid var(--kn-copper-d);outline-offset:3px}
.kn-swatch__n{font-size:var(--kn-fs-0);text-align:center;color:var(--kn-ink-2)}

/* ---------- Mặt tiền (canvas) ---------- */
.kn-facade{display:grid;gap:var(--kn-s-6)}
@media(min-width:1000px){.kn-facade{grid-template-columns:minmax(0,1.4fr) minmax(280px,.6fr);align-items:start}}
.kn-facade__stage{position:relative;border:1px solid var(--kn-line);border-radius:var(--kn-r);overflow:hidden;background:var(--kn-white-2);touch-action:none}
.kn-facade__stage canvas{width:100%;height:auto;cursor:grab;display:block}
.kn-facade__stage canvas.is-drag{cursor:grabbing}
.kn-facade__empty{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:24px;background:var(--kn-white-2)}
.kn-facade__empty[hidden]{display:none}
.kn-facade__ctl{border:1px solid var(--kn-line);border-radius:var(--kn-r);padding:20px}
.kn-facade__cfg{font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.kn-facade__lab{display:grid;gap:6px;margin:16px 0;font-size:var(--kn-fs-1);color:var(--kn-ink-2)}
.kn-facade__lab input{accent-color:var(--kn-copper);min-height:28px}
.kn-facade__btns{display:flex;flex-wrap:wrap;gap:8px}

/* ---------- Chọn kính (quiz) ---------- */
.kn-quiz{display:grid;gap:var(--kn-s-6)}
@media(min-width:1000px){.kn-quiz{grid-template-columns:minmax(0,1fr) 360px;align-items:start}.kn-quiz__r{position:sticky;top:calc(var(--kn-hd) + 12px)}}
.kn-quiz__f{display:grid;gap:12px}
.kn-quiz__r{border:1px solid var(--kn-copper);border-radius:var(--kn-r);padding:22px;background:var(--kn-white)}
.kn-quiz__r .kn-h3{margin-bottom:8px}

/* ---------- Bảo hành ---------- */
.kn-wl{margin-top:20px;padding-top:16px;border-top:1px solid var(--kn-line)}
.kn-wl h4{font-size:var(--kn-fs-2);margin:16px 0 6px}
.kn-wl .kn-table{min-width:0}

/* ---------- In ---------- */
@media print{.kn-hd,.kn-ft,.kn-sticky,.kn-cta,.kn-hero__hint{display:none!important}body{background:#fff}}