:root {
  --canvas: #f2efe7;
  --paper: #fffdf7;
  --paper-deep: #e9e3d6;
  --ink: #292725;
  --ink-soft: #625e59;
  --ink-faint: #888078;
  --navy: #292c2a;
  --navy-2: #3b403c;
  --teal: #8b5a3c;
  --mint: #e9e1d4;
  --seal: #b3253a;
  --seal-dark: #801729;
  --gold: #e2ad50;
  --line: rgba(45, 40, 36, .14);
  --line-strong: rgba(45, 40, 36, .24);
  --white-line: rgba(255, 255, 255, .14);
  --shadow-sm: 0 10px 30px rgba(44, 34, 29, .08);
  --shadow-md: 0 24px 60px rgba(44, 34, 29, .15);
  --shadow-lg: 0 42px 100px rgba(38, 27, 24, .28);
  --sans: "Aptos", "Segoe UI Variable Text", "Segoe UI", -apple-system, BlinkMacSystemFont, Arial, sans-serif;
  --doc: "Times New Roman", Times, "Liberation Serif", serif;
  --mono: "Cascadia Mono", "Consolas", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 8% 12%, rgba(226, 173, 80, .14), transparent 28rem),
    radial-gradient(circle at 92% 82%, rgba(179, 37, 58, .18), transparent 32rem),
    linear-gradient(135deg, #21181a 0%, #382126 55%, #201719 100%);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: 0;
  inset: 0;
  content: "";
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 220, 155, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 220, 155, .025) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to bottom, #000, transparent 75%);
}

.site-frame {
  position: relative;
  z-index: 1;
  width: min(100%, 133.333svh);
  min-height: 100svh;
  margin-inline: auto;
  background:
    radial-gradient(circle at 9% 4%, rgba(226, 173, 80, .16), transparent 25rem),
    radial-gradient(circle at 92% 16%, rgba(156, 55, 69, .1), transparent 28rem),
    var(--canvas);
  box-shadow: 0 0 0 1px rgba(255, 225, 169, .1), 0 0 90px rgba(0, 0, 0, .36);
  container-name: site;
  container-type: inline-size;
}

img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

::selection {
  background: #9d2036;
  color: #fff8e9;
}

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: .75rem;
  left: .75rem;
  padding: .7rem 1rem;
  border-radius: 999px;
  background: var(--navy);
  color: white;
  transform: translateY(-150%);
  transition: transform .18s ease;
}

.skip-link:focus { transform: translateY(0); }

.shell {
  width: min(100% - 2rem, 74rem);
  margin-inline: auto;
}

.narrow { max-width: 48rem; }
.mono { font-family: var(--mono); }

.national-banner {
  position: relative;
  overflow: hidden;
  min-height: clamp(11.5rem, 17vw, 15rem);
  display: grid;
  place-items: center;
  border-bottom: 1px solid rgba(255, 222, 159, .35);
  background:
    radial-gradient(circle at 15% 10%, rgba(255, 213, 121, .22), transparent 24rem),
    radial-gradient(circle at 88% 90%, rgba(79, 4, 24, .5), transparent 30rem),
    linear-gradient(118deg, #bd1f35 0%, #9d1730 55%, #7f1228 100%);
  box-shadow: inset 0 -1px rgba(255,255,255,.1);
  color: white;
  isolation: isolate;
}

.national-banner::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(145, 13, 38, .96) 0%, rgba(145, 13, 38, .76) 43%, rgba(145, 13, 38, .18) 72%),
    url("/assets/dong-son-banner.webp") right 48% center / auto 152% no-repeat;
  content: "";
  pointer-events: none;
  filter: saturate(.92) contrast(1.04);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, rgba(0,0,0,.2) 35%, #000 58%);
  mask-image: linear-gradient(90deg, transparent 0%, rgba(0,0,0,.2) 35%, #000 58%);
}

.national-banner::after {
  position: absolute;
  z-index: -1;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 224, 165, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 224, 165, .055) 1px, transparent 1px),
    radial-gradient(circle at 79% 50%, rgba(255, 218, 137, .12), transparent 24%);
  background-size: 34px 34px, 34px 34px, 100% 100%;
  content: "";
  pointer-events: none;
}

.national-inner {
  position: relative;
  z-index: 2;
  display: grid;
  width: min(100% - 3rem, 90rem);
  padding-block: clamp(1.6rem, 3vw, 2.7rem);
  grid-template-columns: clamp(8rem, 12vw, 11rem) minmax(0, 1fr) clamp(8rem, 12vw, 11rem);
  align-items: center;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.national-inner::after {
  display: block;
  width: 100%;
  content: "";
}

.flag-frame {
  padding: .55rem;
  border: 1px solid rgba(255, 226, 168, .55);
  border-radius: .65rem;
  background: rgba(255, 248, 228, .11);
  box-shadow: 0 24px 50px rgba(65, 4, 20, .34);
}

.national-flag {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: .28rem;
  background: #da251d;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.16);
}

.national-star {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 43%;
  aspect-ratio: 1;
  background: #ffde00;
  clip-path: polygon(50% 0%, 61.8% 35.1%, 98.5% 35.1%, 68.8% 57.3%, 80.9% 92.4%, 50% 70.7%, 19.1% 92.4%, 31.2% 57.3%, 1.5% 35.1%, 38.2% 35.1%);
  transform: translate(-50%, -50%);
}

.national-copy { min-width: 0; text-align: center; text-shadow: 0 3px 18px rgba(70, 4, 21, .72); }
.national-title { display: block; margin: 0; font-family: var(--doc); font-size: clamp(1.35rem, 2.35vw, 2.4rem); font-weight: 700; letter-spacing: .012em; line-height: 1.1; white-space: nowrap; }
.national-motto { display: block; width: max-content; margin: .85rem auto 0; padding-bottom: .28rem; border-bottom: 2px solid #f2c566; color: #ffe6ad; font-family: var(--doc); font-size: clamp(1rem, 1.55vw, 1.3rem); font-weight: 700; line-height: 1.15; white-space: nowrap; }

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  padding: .8rem 0;
  border-bottom: 1px solid rgba(16, 35, 45, .08);
  background: rgba(242, 239, 231, .84);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

.nav-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: .7rem;
  color: var(--ink);
  font-size: .95rem;
  font-weight: 760;
  letter-spacing: -.02em;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 2.35rem;
  height: 2.35rem;
  place-items: center;
  border: 1px solid rgba(255,255,255,.22);
  border-radius: .7rem;
  background: linear-gradient(145deg, var(--navy-2), var(--navy));
  box-shadow: 5px 6px 0 rgba(179, 37, 58, .18), var(--shadow-sm);
  color: white;
  font-family: var(--doc);
  font-size: 1.15rem;
  transform: rotate(-4deg);
}

.brand em {
  color: var(--seal);
  font-style: normal;
}

.site-nav {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: .3rem;
}

.site-nav a {
  padding: .55rem .75rem;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: .88rem;
  font-weight: 640;
  text-decoration: none;
  transition: color .18s ease, background-color .18s ease, transform .18s ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: rgba(255, 253, 247, .78);
  color: var(--ink);
}

.site-nav .nav-cta {
  margin-left: .35rem;
  padding-inline: 1rem;
  background: var(--navy);
  color: white;
  box-shadow: 0 8px 24px rgba(42, 35, 31, .16);
}

.site-nav .nav-cta:hover {
  background: var(--seal);
  color: white;
  transform: translateY(-1px);
}

.hero {
  display: grid;
  min-height: 41rem;
  padding-block: clamp(4rem, 7vw, 6rem) clamp(3rem, 6vw, 5rem);
  grid-template-columns: minmax(0, 1fr) minmax(32rem, 1.02fr);
  align-items: center;
  gap: clamp(2.5rem, 5vw, 4.5rem);
}

.hero-copy { position: relative; z-index: 4; max-width: 35rem; }

.kicker,
.eyebrow {
  display: flex;
  margin: 0 0 1rem;
  align-items: center;
  gap: .65rem;
  color: var(--seal);
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: .14em;
  line-height: 1.4;
  text-transform: uppercase;
}

.kicker::before,
.eyebrow::before {
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 5px rgba(179, 37, 58, .1);
  content: "";
}

.hero h1,
.page-hero h1 {
  margin: 0;
  font-size: clamp(3rem, 5.2vw, 5.25rem);
  font-weight: 780;
  letter-spacing: -.058em;
  line-height: .98;
  text-wrap: balance;
}

.hero h1 span { color: var(--teal); }

.hero-lede,
.page-lede {
  max-width: 38rem;
  margin: 1.6rem 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.08rem, 1.7vw, 1.3rem);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  margin-top: 2rem;
  flex-wrap: wrap;
  gap: .8rem;
}

.button {
  display: inline-flex;
  min-height: 3.2rem;
  padding: .8rem 1.25rem;
  border: 1px solid transparent;
  border-radius: .8rem;
  align-items: center;
  justify-content: center;
  gap: .65rem;
  background: var(--navy);
  box-shadow: 0 13px 30px rgba(42, 35, 31, .18);
  color: white;
  font-size: .92rem;
  font-weight: 740;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, background-color .2s ease;
}

.button::after { content: "↗"; font-size: 1.05em; }
.button:hover { transform: translateY(-3px); box-shadow: 0 17px 35px rgba(42, 35, 31, .24); }
.button.secondary { border-color: var(--line-strong); background: rgba(255,253,247,.55); box-shadow: none; color: var(--ink); }
.button.secondary::after { content: "→"; }
.button.secondary:hover { background: var(--paper); }
.button.seal { background: var(--seal); }

.hero-notes {
  display: flex;
  margin: 1.5rem 0 0;
  padding: 0;
  flex-wrap: wrap;
  gap: .6rem 1.15rem;
  color: var(--ink-faint);
  font-size: .78rem;
  list-style: none;
}

.hero-notes li { display: flex; align-items: center; gap: .4rem; }
.hero-notes li::before { color: var(--teal); content: "●"; font-size: .52rem; }

.hero-stage {
  position: relative;
  min-height: 34rem;
  perspective: 1200px;
  isolation: isolate;
}

.stage-glow {
  position: absolute;
  inset: 8% 2% 4% 5%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 58% 42%, rgba(226, 173, 80, .4), transparent 30%),
    radial-gradient(circle at 50% 50%, rgba(142, 54, 68, .26), transparent 65%);
  filter: blur(35px);
  opacity: .65;
}

.document-deck {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transform: rotateX(4deg) rotateY(-4deg);
}

.sample-sheet {
  position: absolute;
  overflow: hidden;
  width: 52%;
  aspect-ratio: .707 / 1;
  margin: 0;
  border: 1px solid rgba(16, 35, 45, .15);
  border-radius: .65rem;
  background: white;
  box-shadow: var(--shadow-lg);
  transform-style: preserve-3d;
  transition: transform .5s cubic-bezier(.2,.8,.2,1), filter .5s ease;
}

.sample-sheet::after {
  position: absolute;
  z-index: -1;
  right: -.55rem;
  bottom: -.55rem;
  width: 100%;
  height: 100%;
  border: 1px solid rgba(16, 35, 45, .08);
  border-radius: inherit;
  background: #ddd8cc;
  content: "";
  transform: translateZ(-1px);
}

.sample-sheet img { width: 100%; height: 100%; object-fit: cover; object-position: top center; }

.sample-sheet figcaption {
  position: absolute;
  inset: auto .6rem .6rem;
  display: flex;
  padding: .55rem .7rem;
  border: 1px solid rgba(255,255,255,.36);
  border-radius: .55rem;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  background: rgba(40, 31, 28, .88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  color: white;
  font-size: .66rem;
  font-weight: 730;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.source-sheet {
  z-index: 1;
  top: 18%;
  left: 3%;
  filter: saturate(.8);
  transform: translate3d(0,0,-55px) rotateY(18deg) rotateZ(-7deg);
  animation: float-source 8s ease-in-out infinite;
}

.processed-sheet {
  z-index: 3;
  top: 3%;
  right: 7%;
  transform: translate3d(0,0,35px) rotateY(-10deg) rotateZ(3deg);
  animation: float-processed 8s ease-in-out infinite -2s;
}

.hero-stage:hover .source-sheet { transform: translate3d(-12px, 8px, -20px) rotateY(13deg) rotateZ(-9deg); }
.hero-stage:hover .processed-sheet { transform: translate3d(12px, -8px, 62px) rotateY(-6deg) rotateZ(4deg); }

.structure-card {
  position: absolute;
  z-index: 5;
  right: 0;
  bottom: 7%;
  width: min(18rem, 52%);
  padding: 1rem;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 1rem;
  background: linear-gradient(145deg, rgba(62, 55, 50, .98), rgba(36, 31, 29, .99));
  box-shadow: var(--shadow-lg);
  color: white;
  transform: translateZ(90px) rotateY(-9deg) rotateX(3deg);
}

.structure-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.structure-top strong { font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; }
.status-dot { display: inline-flex; align-items: center; gap: .35rem; color: #b8dcca; font-size: .68rem; }
.status-dot::before { width: .45rem; height: .45rem; border-radius: 50%; background: #68d49b; box-shadow: 0 0 0 4px rgba(104,212,155,.12); content: ""; }

.structure-grid {
  display: grid;
  margin-top: .85rem;
  padding: .55rem;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: .55rem;
  grid-template-columns: .45fr 1.1fr 1.25fr .7fr;
  gap: 3px;
}

.structure-grid span { min-height: 1.6rem; border-radius: .18rem; background: rgba(255,255,255,.12); }
.structure-grid span:nth-child(2), .structure-grid span:nth-child(7) { background: rgba(226,173,80,.5); }
.structure-grid span:nth-child(5), .structure-grid span:nth-child(10) { background: rgba(178, 70, 78, .42); }

.structure-meta { display: flex; margin-top: .8rem; justify-content: space-between; gap: 1rem; color: rgba(255,255,255,.65); font-family: var(--mono); font-size: .62rem; }

@keyframes float-source {
  0%,100% { transform: translate3d(0,0,-55px) rotateY(18deg) rotateZ(-7deg); }
  50% { transform: translate3d(-4px,-10px,-45px) rotateY(17deg) rotateZ(-6deg); }
}

@keyframes float-processed {
  0%,100% { transform: translate3d(0,0,35px) rotateY(-10deg) rotateZ(3deg); }
  50% { transform: translate3d(6px,-12px,45px) rotateY(-9deg) rotateZ(2deg); }
}

.local-rail-wrap { padding: 0 0 clamp(4rem, 7vw, 7rem); }

.local-rail {
  display: grid;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 1.2rem;
  background: var(--navy);
  box-shadow: var(--shadow-md);
  color: white;
  grid-template-columns: repeat(4, 1fr);
}

.rail-step {
  position: relative;
  min-height: 8.8rem;
  padding: 1.25rem;
}

.rail-step + .rail-step { border-left: 1px solid var(--white-line); }
.rail-step + .rail-step::before { position: absolute; top: 50%; left: 0; width: 1.8rem; height: 1.8rem; display: grid; border: 1px solid var(--white-line); border-radius: 50%; background: var(--navy); color: var(--gold); content: "→"; place-items: center; transform: translate(-50%,-50%); }
.rail-index { color: var(--gold); font-family: var(--mono); font-size: .7rem; }
.rail-step strong { display: block; margin-top: .55rem; font-size: .92rem; }
.rail-step p { margin: .25rem 0 0; color: rgba(255,255,255,.62); font-size: .76rem; line-height: 1.5; }

.landing-section { padding-block: clamp(4rem, 8vw, 7.5rem); }
.section-head { display: grid; margin-bottom: clamp(2rem, 5vw, 4rem); grid-template-columns: .7fr 1.3fr; gap: 2rem; align-items: end; }
.section-head h2,
.honesty-copy h2,
.contact-intro h2,
.content-section h2 {
  margin: 0;
  font-size: clamp(2.1rem, 4vw, 4rem);
  font-weight: 760;
  letter-spacing: -.045em;
  line-height: 1.03;
  text-wrap: balance;
}

.section-head p:not(.eyebrow) { max-width: 38rem; margin: 0; color: var(--ink-soft); font-size: 1.05rem; }

.sample-lab {
  position: relative;
  overflow: hidden;
  border-radius: 2rem;
  background:
    radial-gradient(circle at 18% 12%, rgba(193, 132, 67, .32), transparent 28rem),
    radial-gradient(circle at 88% 82%, rgba(133, 35, 57, .48), transparent 26rem),
    linear-gradient(145deg, #2b2421 0%, #201a1b 52%, #25191e 100%);
  box-shadow: var(--shadow-lg);
  color: white;
}

.sample-lab::before {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(244,213,162,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(244,213,162,.045) 1px, transparent 1px);
  background-size: 28px 28px;
  content: "";
  pointer-events: none;
}

.sample-lab::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 48%, rgba(10, 6, 8, .2));
  content: "";
  pointer-events: none;
}

.sample-lab-inner { position: relative; z-index: 1; display: grid; min-height: 43rem; padding: clamp(1.5rem, 4vw, 3.5rem); grid-template-columns: 1.15fr .85fr; gap: clamp(2rem, 5vw, 5rem); align-items: center; }

.real-samples { position: relative; min-height: 35rem; perspective: 1100px; transform-style: preserve-3d; }
.sample-zoom-hint { position: absolute; z-index: 8; top: 0; left: 0; display: inline-flex; padding: .5rem .7rem; border: 1px solid rgba(244,213,162,.18); border-radius: 999px; align-items: center; gap: .45rem; background: rgba(25,16,17,.55); color: rgba(255,255,255,.68); font-size: .64rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; backdrop-filter: blur(10px); }
.sample-zoom-hint::before { width: .48rem; height: .48rem; border-radius: 50%; background: #e7b768; box-shadow: 0 0 0 4px rgba(231,183,104,.11); content: ""; }
.real-sample { position: absolute; overflow: hidden; width: 52%; aspect-ratio: .707 / 1; margin: 0; border: 1px solid rgba(255,255,255,.27); border-radius: .7rem; background: white; box-shadow: 0 35px 75px rgba(0,0,0,.46), 0 0 0 1px rgba(231,183,104,.05); cursor: zoom-in; transform-origin: center center; transition: transform .55s cubic-bezier(.2,.82,.2,1), opacity .35s ease, filter .35s ease, box-shadow .35s ease; will-change: transform; }
.real-sample img { width: 100%; height: 100%; object-fit: cover; object-position: top center; }
.real-sample figcaption { position: absolute; inset: auto .65rem .65rem; display: flex; padding: .55rem .65rem; border: 1px solid rgba(244,213,162,.13); border-radius: .5rem; align-items: center; justify-content: space-between; gap: .6rem; background: rgba(30,18,19,.89); color: white; font-size: .67rem; font-weight: 760; letter-spacing: .07em; text-transform: uppercase; backdrop-filter: blur(10px); }
.zoom-copy { color: #f1c87f; font-size: .58rem; white-space: nowrap; }
.real-sample.original { top: 10%; left: 3%; transform: rotateY(20deg) rotateZ(-6deg) translateZ(-15px); }
.real-sample.cleaned { z-index: 2; top: 1%; right: 5%; transform: rotateY(-14deg) rotateZ(4deg) translateZ(45px); }

@media (hover: hover) and (pointer: fine) {
  .real-samples:hover .real-sample:not(:hover) { opacity: .3; filter: saturate(.35) brightness(.58); transform: scale(.88) translateZ(-70px); }
  .real-samples .real-sample.original:hover { z-index: 10; box-shadow: 0 48px 110px rgba(0,0,0,.62), 0 0 0 2px rgba(231,183,104,.23); transform: translate3d(30%, -3%, 130px) rotateY(0) rotateZ(-1deg) scale(1.36); }
  .real-samples .real-sample.cleaned:hover { z-index: 10; box-shadow: 0 48px 110px rgba(0,0,0,.62), 0 0 0 2px rgba(231,183,104,.23); transform: translate3d(-27%, 3%, 130px) rotateY(0) rotateZ(1deg) scale(1.36); }
}

.real-samples:focus-within .real-sample:not(:focus-visible) { opacity: .3; filter: saturate(.35) brightness(.58); transform: scale(.88) translateZ(-70px); }
.real-samples .real-sample.original:focus-visible { z-index: 10; outline-color: #f1c87f; box-shadow: 0 48px 110px rgba(0,0,0,.62), 0 0 0 2px rgba(231,183,104,.23); transform: translate3d(30%, -3%, 130px) rotateY(0) rotateZ(-1deg) scale(1.36); }
.real-samples .real-sample.cleaned:focus-visible { z-index: 10; outline-color: #f1c87f; box-shadow: 0 48px 110px rgba(0,0,0,.62), 0 0 0 2px rgba(231,183,104,.23); transform: translate3d(-27%, 3%, 130px) rotateY(0) rotateZ(1deg) scale(1.36); }

.sample-copy { position: relative; z-index: 2; }
.sample-copy .eyebrow { color: #f4c771; }
.sample-copy .eyebrow::before { box-shadow: 0 0 0 5px rgba(244,199,113,.12); }
.sample-copy h3 { margin: 0; font-size: clamp(2rem, 4vw, 3.8rem); letter-spacing: -.045em; line-height: 1.04; text-wrap: balance; }
.sample-copy > p { margin: 1.25rem 0 0; color: rgba(255,255,255,.7); }
.sample-facts { display: grid; margin: 2rem 0 0; padding: 0; gap: .75rem; list-style: none; }
.sample-facts li { display: grid; grid-template-columns: 1.85rem 1fr; gap: .7rem; color: rgba(255,255,255,.76); font-size: .86rem; }
.sample-facts li::before { display: grid; width: 1.6rem; height: 1.6rem; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; color: #f4c771; content: "✓"; place-items: center; }
.sample-warning { margin-top: 1.5rem !important; padding-top: 1.25rem; border-top: 1px solid var(--white-line); color: rgba(255,255,255,.55) !important; font-size: .78rem; }

.accent-demo {
  display: grid;
  margin-top: 1.2rem;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: .85rem;
  grid-template-columns: 1fr 1fr;
}

.accent-demo > div { padding: .9rem; }
.accent-demo > div + div { border-left: 1px solid rgba(255,255,255,.16); }
.accent-demo span { display: block; margin-bottom: .35rem; color: rgba(255,255,255,.45); font-size: .63rem; letter-spacing: .08em; text-transform: uppercase; }
.accent-demo p { margin: 0; font-family: var(--doc); font-size: .94rem; line-height: 1.45; }
.accent-demo .restored { color: #f4c771; }

.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
}

.feature-card {
  position: relative;
  overflow: hidden;
  min-height: 19rem;
  padding: clamp(1.4rem, 3vw, 2.2rem);
  border: 1px solid var(--line);
  border-radius: 1.4rem;
  background: rgba(255,253,247,.82);
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease;
}

.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.feature-card h3 { position: relative; z-index: 2; max-width: 25rem; margin: 0; font-size: clamp(1.25rem, 2.2vw, 1.75rem); letter-spacing: -.025em; line-height: 1.15; }
.feature-card > p { position: relative; z-index: 2; max-width: 28rem; margin: .75rem 0 0; color: var(--ink-soft); font-size: .9rem; }
.feature-number { display: block; margin-bottom: 2.2rem; color: var(--seal); font-family: var(--mono); font-size: .7rem; letter-spacing: .08em; }
.feature-wide { grid-column: span 7; }
.feature-narrow { grid-column: span 5; }
.feature-half { grid-column: span 6; }
.feature-dark { border-color: transparent; background: var(--navy); color: white; }
.feature-dark > p { color: rgba(255,255,255,.62); }
.feature-dark .feature-number { color: var(--gold); }
.feature-mint { background: var(--mint); }
.feature-seal { background: var(--seal); color: white; }
.feature-seal > p { color: rgba(255,255,255,.72); }
.feature-seal .feature-number { color: #ffd58f; }

.mini-table { position: absolute; right: -2rem; bottom: -2rem; width: 54%; padding: .7rem; border: 1px solid var(--line); border-radius: .8rem; background: white; box-shadow: var(--shadow-md); transform: rotate(-4deg); }
.mini-table-grid { display: grid; grid-template-columns: .5fr 1.2fr 1fr; gap: 3px; }
.mini-table-grid span { min-height: 2.1rem; border: 1px solid #cdd5d3; background: #f6f5f1; }
.mini-table-grid span:nth-child(-n+3) { min-height: 1.4rem; background: #dce8e5; }
.mini-table-grid span:nth-child(5) { grid-row: span 2; min-height: 4.35rem; }
.mini-table-tag { margin-top: .45rem; color: var(--ink-faint); font-family: var(--mono); font-size: .58rem; }

.network-visual { position: absolute; right: 1rem; bottom: 1rem; left: 1rem; height: 6rem; }
.network-line { position: absolute; top: 50%; right: 8%; left: 8%; height: 1px; background: linear-gradient(90deg, #d6aa61 0 43%, rgba(255,255,255,.15) 43% 57%, #d6aa61 57%); }
.network-node { position: absolute; top: 50%; display: grid; width: 4.2rem; height: 4.2rem; border: 1px solid rgba(255,255,255,.18); border-radius: 1rem; background: #3a3733; box-shadow: 0 15px 30px rgba(0,0,0,.24); place-items: center; transform: translateY(-50%); }
.network-node:first-child { left: 3%; }
.network-node:nth-child(2) { left: calc(50% - 2.1rem); }
.network-node:nth-child(3) { right: 3%; }
.network-node span { color: rgba(255,255,255,.6); font-family: var(--mono); font-size: .58rem; text-align: center; }
.offline-cut { position: absolute; z-index: 2; top: 50%; left: 50%; display: grid; width: 2rem; height: 2rem; border-radius: 50%; background: var(--seal); color: white; font-weight: 800; place-items: center; transform: translate(-50%,-50%) rotate(12deg); }

.accent-cloud { position: absolute; right: -1rem; bottom: -1.5rem; width: 52%; color: rgba(104, 65, 44, .13); font-family: var(--doc); font-size: clamp(4.5rem, 10vw, 8.5rem); font-weight: 700; letter-spacing: -.12em; line-height: .75; transform: rotate(-7deg); }
.review-list { position: absolute; right: 1.4rem; bottom: 1.2rem; left: 1.4rem; display: grid; gap: .55rem; }
.review-row { display: grid; padding: .65rem .75rem; border: 1px solid rgba(255,255,255,.16); border-radius: .55rem; background: rgba(255,255,255,.09); grid-template-columns: auto 1fr auto; gap: .65rem; align-items: center; font-size: .72rem; }
.review-row i { width: .48rem; height: .48rem; border-radius: 50%; background: #ffd58f; }
.review-row em { color: rgba(255,255,255,.55); font-family: var(--mono); font-style: normal; font-size: .58rem; }

.audience-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.audience-card { position: relative; min-height: 20rem; padding: 1.5rem; overflow: hidden; border: 1px solid var(--line); border-radius: 1.3rem; background: rgba(255,253,247,.8); }
.audience-card::after {
  position: absolute;
  right: -3rem;
  bottom: -4.5rem;
  width: 13rem;
  height: 13rem;
  border: 1px solid rgba(184, 132, 65, .18);
  border-radius: 50%;
  background:
    repeating-radial-gradient(circle, transparent 0 .72rem, rgba(184,132,65,.11) .76rem .84rem),
    conic-gradient(from 22.5deg, rgba(184,132,65,.1) 0 11.25deg, transparent 11.25deg 22.5deg);
  box-shadow: inset 0 0 0 1.3rem rgba(184,132,65,.045), 0 18px 45px rgba(71,44,28,.08);
  content: "";
  transform: rotate(-12deg);
}
.audience-card:nth-child(2)::after { filter: hue-rotate(324deg) saturate(1.25); opacity: .72; }
.audience-card:nth-child(3)::after { opacity: .88; }
.audience-code { color: var(--seal); font-family: var(--mono); font-size: .7rem; }
.audience-card h3 { margin: 3rem 0 .7rem; font-size: 1.5rem; letter-spacing: -.025em; }
.audience-card p { margin: 0; color: var(--ink-soft); font-size: .9rem; }
.audience-mode { position: absolute; z-index: 2; right: 1.5rem; bottom: 1.4rem; left: 1.5rem; padding-top: .9rem; border-top: 1px solid var(--line); color: var(--teal); font-size: .75rem; font-weight: 760; }

.contact-zone { position: relative; margin-top: clamp(2rem, 6vw, 6rem); padding-block: clamp(4rem, 8vw, 7rem); overflow: hidden; background: var(--navy); color: white; isolation: isolate; }
.contact-zone::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background: url("/assets/dong-son-banner.webp") right -5rem center / auto 145% no-repeat;
  content: "";
  filter: grayscale(.55) saturate(.8);
  opacity: .11;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(90deg, transparent 24%, #000 74%);
  mask-image: linear-gradient(90deg, transparent 24%, #000 74%);
}
.honesty-layout { position: relative; z-index: 1; display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(2rem, 6vw, 6rem); }
.honesty-copy .eyebrow, .contact-intro .eyebrow { color: #f3bf66; }
.honesty-copy .eyebrow::before, .contact-intro .eyebrow::before { box-shadow: 0 0 0 5px rgba(243,191,102,.12); }
.honesty-copy > p { color: rgba(255,255,255,.67); }
.honesty-copy h2 { margin-bottom: 1.2rem; }
.honest { margin-top: 2rem; padding: 1.3rem 1.4rem; border: 1px solid rgba(255,255,255,.14); border-left: 3px solid var(--gold); border-radius: .8rem; background: rgba(255,255,255,.055); }
.honest p { margin: 0; }
.honest ul { margin: .85rem 0 0; padding-left: 1.15rem; color: rgba(255,255,255,.65); }
.honest li { margin-bottom: .55rem; font-size: .82rem; line-height: 1.55; }
.honest li::marker { color: var(--gold); }

.contact-panel { padding: clamp(1.3rem, 3vw, 2rem); border: 1px solid rgba(255,255,255,.14); border-radius: 1.35rem; background: rgba(255,255,255,.96); box-shadow: 0 35px 80px rgba(0,0,0,.28); color: var(--ink); }
.contact-intro h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); }
.contact-intro p:not(.eyebrow) { margin: .8rem 0 0; color: var(--ink-soft); font-size: .88rem; }
.direct-contact { display: flex; margin: 1.25rem 0 1.4rem; padding-bottom: 1.25rem; border-bottom: 1px solid var(--line); flex-wrap: wrap; gap: .65rem 1rem; }
.direct-contact a, .direct-contact span { font-size: .82rem; font-weight: 720; text-decoration: none; }
.direct-contact a { color: var(--seal); }
.contact-form { display: grid; gap: 1rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem; }
.field { display: flex; flex-direction: column; gap: .32rem; }
.field-wide { grid-column: 1 / -1; }
.field label { color: var(--ink-soft); font-size: .72rem; font-weight: 760; }
.field input, .field select { width: 100%; min-height: 2.9rem; padding: .65rem .72rem; border: 1px solid var(--line-strong); border-radius: .65rem; background: #fbfaf5; color: var(--ink); }
.field input:focus, .field select:focus { border-color: var(--teal); outline: 3px solid rgba(139, 90, 60, .16); }
.consent { display: flex; align-items: flex-start; gap: .6rem; color: var(--ink-soft); font-size: .72rem; line-height: 1.5; }
.consent input { margin-top: .25rem; accent-color: var(--seal); }
.privacy-note { color: var(--ink-faint) !important; font-size: .72rem !important; line-height: 1.55; }
.form-status { min-height: 1.5rem; margin: 0; color: var(--ink-soft); font-size: .75rem; }
.form-status[data-kind="success"] { color: #1b7040; }
.form-status[data-kind="error"] { color: var(--seal); }
.website-field { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.contact-form .button { border: 0; cursor: pointer; }
.contact-form .button:disabled { cursor: wait; opacity: .62; transform: none; }

.site-footer { padding-block: 2rem 3rem; border-top: 1px solid rgba(16,35,45,.1); color: var(--ink-faint); font-size: .75rem; }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: start; }
.footer-brand { color: var(--ink); font-weight: 760; }
.footer-copy { max-width: 48rem; margin-top: .45rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: .55rem 1rem; }
.footer-links a { color: var(--ink-soft); text-decoration: none; }
.footer-links a:hover { color: var(--seal); }

/* Secondary pages */
.page-main { padding-bottom: clamp(4rem, 8vw, 7rem); }
.page-hero { display: grid; min-height: 34rem; padding-block: clamp(4rem, 8vw, 7rem); grid-template-columns: 1fr .8fr; gap: clamp(2rem, 6vw, 6rem); align-items: center; }
.page-hero h1 { font-size: clamp(3rem, 6vw, 5.6rem); }
.page-visual { position: relative; min-height: 23rem; perspective: 900px; }
.page-stack-card { position: absolute; right: 4%; width: 74%; min-height: 16rem; padding: 1.2rem; border: 1px solid var(--line); border-radius: 1rem; background: var(--paper); box-shadow: var(--shadow-md); transform-style: preserve-3d; }
.page-stack-card:nth-child(1) { top: 0; transform: rotateY(-18deg) rotateZ(5deg) translateZ(-35px); opacity: .55; }
.page-stack-card:nth-child(2) { top: 2.5rem; right: 12%; transform: rotateY(-11deg) rotateZ(1deg) translateZ(15px); }
.page-stack-card:nth-child(3) { top: 7rem; right: 0; background: var(--navy); color: white; transform: rotateY(-7deg) rotateZ(-3deg) translateZ(55px); }
.stack-card-label { color: var(--seal); font-family: var(--mono); font-size: .65rem; text-transform: uppercase; }
.page-stack-card:nth-child(3) .stack-card-label { color: var(--gold); }
.stack-lines { display: grid; margin-top: 1rem; gap: .55rem; }
.stack-lines i { display: block; height: .5rem; border-radius: 999px; background: var(--paper-deep); }
.stack-lines i:nth-child(2) { width: 76%; }
.stack-lines i:nth-child(3) { width: 88%; }
.page-stack-card:nth-child(3) .stack-lines i { background: rgba(255,255,255,.13); }

.content-section { padding-block: clamp(3rem, 6vw, 5.5rem); border-top: 1px solid var(--line); }
.content-section h2 { margin-bottom: 1.2rem; font-size: clamp(1.9rem, 3.5vw, 3.2rem); }
.content-section h3 { margin: 0; font-size: 1.05rem; }
.content-section > p, .content-section li { color: var(--ink-soft); }
.tag { display: inline-flex; margin-bottom: 1rem; padding: .35rem .7rem; border: 1px solid var(--line-strong); border-radius: 999px; color: var(--teal); font-size: .68rem; font-weight: 770; letter-spacing: .08em; text-transform: uppercase; }
.note { margin-top: 1.5rem; padding: 1.1rem 1.25rem; border: 1px solid var(--line); border-left: 3px solid var(--seal); border-radius: .8rem; background: rgba(255,253,247,.76); color: var(--ink-soft); font-size: .88rem; }
.info-grid { display: grid; margin-top: 1.5rem; grid-template-columns: repeat(3,1fr); gap: 1rem; }
.info-grid.two { grid-template-columns: repeat(2,1fr); }
.info-card { min-height: 10rem; padding: 1.25rem; border: 1px solid var(--line); border-radius: 1rem; background: rgba(255,253,247,.78); box-shadow: var(--shadow-sm); }
.info-card p { margin: .45rem 0 0; color: var(--ink-soft); font-size: .86rem; }
.tech-flow { display: grid; margin: 1.7rem 0; grid-template-columns: repeat(4,1fr); gap: .8rem; }
.flow-box { position: relative; min-height: 10rem; padding: 1rem; border: 1px solid var(--line); border-radius: 1rem; background: rgba(255,253,247,.82); box-shadow: var(--shadow-sm); }
.flow-box + .flow-box::before { position: absolute; top: 50%; left: -.9rem; display: grid; width: 1.8rem; height: 1.8rem; border-radius: 50%; background: var(--navy); color: var(--gold); content: "→"; place-items: center; transform: translateY(-50%); }
.flow-index { color: var(--seal); font-family: var(--mono); font-size: .65rem; }
.flow-box strong { display: block; margin-top: 1.8rem; font-size: .9rem; }
.flow-box p { margin: .35rem 0 0; color: var(--ink-soft); font-size: .75rem; }
.scroll { overflow-x: auto; border-radius: 1rem; box-shadow: var(--shadow-sm); }
table { width: 100%; border-collapse: collapse; background: var(--paper); font-size: .84rem; }
th, td { padding: .85rem; border: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: #eee5d8; color: var(--ink); font-size: .75rem; letter-spacing: .02em; }
td { color: var(--ink-soft); }
td:first-child { color: var(--ink); font-weight: 650; }
code { font-family: var(--mono); font-size: .88em; }
.status { color: #167044; font-weight: 800; }
.content-section ul { padding-left: 1.2rem; }
.content-section li { margin-bottom: .55rem; }

@media (max-width: 64rem) {
  .national-banner { min-height: 13rem; }
  .national-banner::before { background-position: right -5rem center; background-size: auto 142%; }
  .national-inner { grid-template-columns: 1fr; justify-items: center; gap: 1rem; }
  .national-inner::after { display: none; }
  .flag-frame { width: 8rem; }
  .national-copy { width: 100%; }
  .national-title { font-size: clamp(1.35rem, 3.2vw, 2rem); }
  .national-motto { margin-top: .65rem; }
  .hero { min-height: auto; grid-template-columns: 1fr; }
  .hero-copy { max-width: 46rem; }
  .hero-stage { min-height: 35rem; }
  .sample-lab-inner { grid-template-columns: 1fr; }
  .sample-copy { max-width: 42rem; }
  .real-samples { min-height: 33rem; }
  .page-hero { grid-template-columns: 1fr; }
  .page-visual { min-height: 21rem; max-width: 36rem; width: 100%; }
  .page-stack-card { left: 12%; right: auto; }
  .page-stack-card:nth-child(2) { right: auto; left: 7%; }
  .page-stack-card:nth-child(3) { right: auto; left: 20%; }
  .tech-flow { grid-template-columns: 1fr 1fr; }
  .flow-box:nth-child(3)::before { display: none; }
}

@media (max-width: 48rem) {
  .shell { width: min(100% - 1.25rem, 74rem); }
  .national-banner { min-height: 11.5rem; }
  .national-banner::before { background-position: 66% center; background-size: auto 122%; filter: saturate(.82) contrast(1.02); opacity: .72; }
  .national-banner::after { background-size: 28px 28px, 28px 28px, 100% 100%; }
  .national-inner { width: min(100% - 1.25rem, 90rem); padding-block: 1.35rem; gap: .8rem; }
  .flag-frame { width: 6.5rem; padding: .36rem; }
  .national-title { font-size: clamp(.78rem, 3.25vw, 1.35rem); letter-spacing: .004em; }
  .national-motto { margin-top: .5rem; font-size: clamp(.82rem, 2.8vw, 1rem); }
  .site-header { position: relative; }
  .nav-row { align-items: flex-start; flex-wrap: wrap; gap: .75rem; }
  .site-nav { width: 100%; margin-left: 0; overflow-x: auto; padding-bottom: .2rem; }
  .site-nav a { flex: 0 0 auto; }
  .site-nav .nav-cta { margin-left: 0; }
  .hero { padding-top: 3.5rem; }
  .hero h1, .page-hero h1 { font-size: clamp(2.75rem, 14vw, 4.2rem); }
  .hero-stage { min-height: 29rem; }
  .sample-sheet { width: 58%; }
  .source-sheet { left: 0; }
  .processed-sheet { right: 0; }
  .structure-card { width: 56%; right: 0; bottom: 1%; transform: translateZ(60px) rotateY(-5deg); }
  .local-rail { grid-template-columns: 1fr 1fr; }
  .rail-step + .rail-step { border-left: 0; }
  .rail-step:nth-child(even) { border-left: 1px solid var(--white-line); }
  .rail-step:nth-child(n+3) { border-top: 1px solid var(--white-line); }
  .rail-step + .rail-step::before { display: none; }
  .section-head { grid-template-columns: 1fr; gap: .8rem; }
  .sample-lab { border-radius: 1.2rem; }
  .sample-lab-inner { padding: 1.25rem; }
  .real-samples { min-height: 28rem; }
  .real-sample { width: 59%; }
  .real-sample.original { left: 0; }
  .real-sample.cleaned { right: 0; }
  .accent-demo { grid-template-columns: 1fr; }
  .accent-demo > div + div { border-top: 1px solid rgba(255,255,255,.16); border-left: 0; }
  .feature-card, .feature-wide, .feature-narrow, .feature-half { grid-column: 1 / -1; }
  .feature-card { min-height: 18rem; }
  .audience-grid { grid-template-columns: 1fr; }
  .honesty-layout { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .field-wide { grid-column: auto; }
  .footer-grid { grid-template-columns: 1fr; }
  .info-grid, .info-grid.two { grid-template-columns: 1fr; }
  .tech-flow { grid-template-columns: 1fr; }
  .flow-box + .flow-box::before { top: -.9rem; left: 50%; transform: translateX(-50%) rotate(90deg); }
  .flow-box:nth-child(3)::before { display: grid; }
  th, td { min-width: 10rem; }
  th:first-child, td:first-child { min-width: 8rem; }
}

@media (max-width: 28rem) {
  .national-inner { padding-block: 1.2rem; }
  .flag-frame { padding: .32rem; }
  .national-title { font-size: .7rem; }
  .national-motto { font-size: .8rem; }
  .brand { font-size: .86rem; }
  .site-nav a { padding-inline: .55rem; }
  .hero-stage { min-height: 25rem; }
  .structure-card { width: 62%; padding: .75rem; }
  .structure-meta { display: none; }
  .local-rail { grid-template-columns: 1fr; }
  .rail-step:nth-child(even) { border-left: 0; }
  .rail-step + .rail-step { border-top: 1px solid var(--white-line); }
  .real-samples { min-height: 23rem; }
  .sample-copy h3 { font-size: 2.1rem; }
  .mini-table { width: 62%; }
}

/* Bố cục được tính theo khung trang 4:3, không theo màn hình rộng bên ngoài. */
@container site (min-width: 53rem) {
  .shell { width: min(100% - 2rem, 68rem); }

  .national-banner { min-height: 9.75rem; }
  .national-banner::before { background-position: right -1.5rem center; background-size: auto 138%; }
  .national-inner {
    width: min(100% - 2rem, 68rem);
    padding-block: 1rem;
    grid-template-columns: 7.5rem minmax(0, 1fr) 7.5rem;
    justify-items: stretch;
    gap: 1.25rem;
  }
  .national-inner::after { display: block; }
  .flag-frame { width: auto; padding: .42rem; }
  .national-copy { width: auto; }
  .national-title { font-size: clamp(1.35rem, 2.2vw, 1.9rem); }
  .national-motto { margin-top: .55rem; font-size: clamp(.95rem, 1.45vw, 1.15rem); }

  .site-header { padding-block: .62rem; }

  .hero {
    min-height: calc(100svh - 13.75rem);
    padding-block: clamp(1.7rem, 3.5vh, 2.6rem);
    grid-template-columns: minmax(0, .84fr) minmax(27rem, 1.16fr);
    gap: clamp(1.5rem, 3vw, 2.5rem);
  }
  .hero-copy { max-width: 30rem; }
  .hero h1 { font-size: clamp(3rem, 5.2vw, 4.15rem); }
  .hero-lede { margin-top: 1.2rem; font-size: clamp(1rem, 1.55vw, 1.16rem); line-height: 1.52; }
  .hero-actions { margin-top: 1.35rem; }
  .hero-notes { margin-top: 1rem; gap: .35rem .8rem; }
  .hero-stage { min-height: clamp(25rem, 47vh, 31rem); }
  .sample-sheet { width: 49%; }
  .structure-card { width: 52%; }

  .page-hero {
    min-height: calc(100svh - 4.6rem);
    padding-block: clamp(3rem, 7vh, 5rem);
    grid-template-columns: minmax(0, 1fr) minmax(22rem, .78fr);
    gap: clamp(2rem, 4vw, 4rem);
  }
  .page-hero h1 { font-size: clamp(3.2rem, 6vw, 5.2rem); }
  .page-visual { width: 100%; max-width: none; min-height: 23rem; }
  .page-stack-card { right: 4%; left: auto; }
  .page-stack-card:nth-child(2) { right: 12%; left: auto; }
  .page-stack-card:nth-child(3) { right: 0; left: auto; }
}

@media (max-aspect-ratio: 4 / 3) {
  .site-frame { width: 100%; box-shadow: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}