/* Self-hosted engineered grotesk: Saira (OFL 1.1), variable width 75-125 + weight 400-700,
   latin + vietnamese subsets. Family name is site-prefixed ("Thaco Engine") so @font-face cannot leak. */
@font-face{font-family:"Thaco Engine";font-style:normal;font-weight:400 700;font-stretch:75% 125%;font-display:swap;src:url("./font-saira-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:"Thaco Engine";font-style:normal;font-weight:400 700;font-stretch:75% 125%;font-display:swap;src:url("./font-saira-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}
/* ============================================================
   THACO concept — scoped under [data-site="thaco"]
   Fingerprint: division tabs corporate · assembly line
   perspective hero · engineered wide grotesk · six division
   panels · conveyor band cadence · industrial steel photography ·
   chamfered panel bolts · measured industrial
   ============================================================ */

[data-site="thaco"] {
  --th-canvas: #eef2f6;
  --th-surface: #ffffff;
  --th-text: #16202b;
  --th-muted: #57616d;
  --th-steel: #0c3a66;
  --th-blue: #12518c;
  --th-amber: #9a5e00;
  --th-amber-bright: #c77800;
  --th-silver: #c9d2da;
  --th-border: #d5dee6;
  --th-container: 78rem;
  --th-display: "Thaco Engine", "Arial Narrow", system-ui, sans-serif;
  --th-t-fast: 120ms;
  --th-t-base: 200ms;

  font-family: system-ui, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--th-canvas);
  color: var(--th-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  margin: 0;
}

[data-site="thaco"] *,
[data-site="thaco"] *::before,
[data-site="thaco"] *::after { box-sizing: border-box; }

[data-site="thaco"] h1,
[data-site="thaco"] h2,
[data-site="thaco"] h3 {
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.015em;
  margin: 0 0 0.6em;
}

[data-site="thaco"] p { margin: 0 0 1em; }
[data-site="thaco"] ul, [data-site="thaco"] ol { margin: 0; padding: 0; list-style: none; }
[data-site="thaco"] a { color: var(--th-steel); }
[data-site="thaco"] svg { max-width: 100%; }

[data-site="thaco"] :focus-visible {
  outline: 3px solid var(--th-amber-bright);
  outline-offset: 2px;
}

[data-site="thaco"] .visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

[data-site="thaco"] .skip {
  position: absolute;
  left: 1rem; top: -4rem;
  background: var(--th-steel);
  color: #fff;
  font-weight: 700;
  padding: 0.7rem 1.2rem;
  z-index: 100;
  text-decoration: none;
  transition: top var(--th-t-fast) ease;
}
[data-site="thaco"] .skip:focus { top: 1rem; }

[data-site="thaco"] .container {
  width: min(100% - 2.5rem, var(--th-container));
  margin-inline: auto;
}

/* ---------- concept strip ---------- */
[data-site="thaco"] .concept-strip {
  background: var(--th-steel);
  color: #c5d5e6;
  font-size: 0.8rem;
  padding: 0.55rem 1rem;
  text-align: center;
}
[data-site="thaco"] .concept-tag {
  display: inline-block;
  background: var(--th-amber-bright);
  color: #241703;
  font-weight: 800;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  padding: 0.12rem 0.6rem;
  margin-right: 0.5rem;
  vertical-align: 1px;
}

/* ---------- header ---------- */
[data-site="thaco"] .site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(238, 242, 246, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--th-border);
}
[data-site="thaco"] .header-inner {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  padding: 0.65rem 0;
}
[data-site="thaco"] .brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--th-steel);
}
[data-site="thaco"] .brand-glyph {
  display: grid;
  place-items: center;
  width: 42px; height: 42px;
  background: var(--th-steel);
  border-radius: 10px;
  color: #fff;
}
[data-site="thaco"] .brand-text { display: flex; flex-direction: column; line-height: 1.15; }
[data-site="thaco"] .brand-name { font-size: 1.3rem; font-weight: 900; letter-spacing: 0.06em; }
[data-site="thaco"] .brand-sub {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--th-amber);
  text-transform: uppercase;
}
[data-site="thaco"] .main-nav { margin-left: auto; }
[data-site="thaco"] .main-nav ul { display: flex; gap: 0.15rem; flex-wrap: wrap; }
[data-site="thaco"] .main-nav a {
  display: block;
  text-decoration: none;
  color: var(--th-text);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.55rem 0.9rem;
  border-bottom: 3px solid transparent;
  transition: border-color var(--th-t-fast) ease, color var(--th-t-fast) ease;
}
[data-site="thaco"] .main-nav a:hover { color: var(--th-steel); border-bottom-color: var(--th-amber-bright); }
[data-site="thaco"] .header-cta {
  text-decoration: none;
  font-weight: 700;
  font-size: 0.85rem;
  color: #fff;
  background: var(--th-steel);
  padding: 0.6rem 1.05rem;
  white-space: nowrap;
  transition: background var(--th-t-fast) ease;
}
[data-site="thaco"] .header-cta:hover { background: var(--th-blue); }

[data-site="thaco"] .nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 0.5rem;
  cursor: pointer;
  margin-left: auto;
}
[data-site="thaco"] .nav-toggle span {
  width: 24px; height: 3px;
  background: var(--th-steel);
}

/* ---------- hero ---------- */
[data-site="thaco"] .hero {
  background: var(--th-canvas);
  padding: 4rem 0 0;
}
[data-site="thaco"] .eyebrow {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  color: var(--th-steel);
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}
[data-site="thaco"] .eyebrow-dark { color: #7d4b00; }
[data-site="thaco"] .chip {
  background: var(--th-steel);
  color: #fff;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  padding: 0.18rem 0.7rem;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}
[data-site="thaco"] .hero h1 {
  font-size: clamp(2.4rem, 5.4vw, 4.2rem);
  margin-bottom: 0.35em;
  max-width: 18ch;
}
[data-site="thaco"] .hero h1 em { font-style: normal; color: var(--th-blue); }
[data-site="thaco"] .lede { color: var(--th-muted); max-width: 42rem; }
[data-site="thaco"] .hero-actions { display: flex; gap: 0.8rem; flex-wrap: wrap; margin: 1.6rem 0 2.25rem; }

[data-site="thaco"] .btn {
  display: inline-block;
  text-decoration: none;
  font-weight: 800;
  padding: 0.85rem 1.5rem;
  border: 2px solid transparent;
  transition: transform var(--th-t-fast) ease, background var(--th-t-fast) ease, border-color var(--th-t-fast) ease;
}
[data-site="thaco"] .btn-steel { background: var(--th-steel); color: #fff; }
[data-site="thaco"] .btn-steel:hover { background: var(--th-blue); transform: translateY(-2px); }
[data-site="thaco"] .btn-outline { color: var(--th-text); border-color: var(--th-text); }
[data-site="thaco"] .btn-outline:hover { border-color: var(--th-amber-bright); color: var(--th-amber); }
[data-site="thaco"] .btn-lg { padding: 1rem 1.85rem; font-size: 1rem; }

[data-site="thaco"] .hero-plate {
  position: relative;
  margin: 0;
  background: var(--th-text);
  overflow: hidden;
}
[data-site="thaco"] .hero-plate img {
  display: block;
  width: 100%;
  height: clamp(300px, 44vw, 540px);
  object-fit: cover;
  filter: saturate(0.9) contrast(1.08) brightness(0.98);
}
[data-site="thaco"] .hero-plate figcaption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 36px clamp(22px, 6vw, 110px) 22px;
  color: #fff;
  background: linear-gradient(transparent, rgba(22, 32, 43, 0.9));
}
[data-site="thaco"] .plate-no {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--th-amber-bright);
}
[data-site="thaco"] .plate-credit { font-size: 0.68rem; letter-spacing: 0.02em; color: #b8c4d0; }

[data-site="thaco"] .division-plates {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}
[data-site="thaco"] .division-plates figure {
  position: relative;
  margin: 0;
  aspect-ratio: 4 / 3;
  background: var(--th-text);
  border: 1px solid var(--th-border);
  overflow: hidden;
}
[data-site="thaco"] .division-plates img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.08);
}
[data-site="thaco"] .division-plates figcaption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 30px 16px 13px;
  color: #fff;
  background: linear-gradient(transparent, rgba(22, 32, 43, 0.9));
}
[data-site="thaco"] .division-plates figcaption strong {
  font-family: var(--th-display);
  font-stretch: 108%;
  font-size: 1.02rem;
  font-weight: 600;
}
[data-site="thaco"] .plate-note {
  margin-top: 0.9rem;
  font-size: 0.8rem;
  color: var(--th-muted);
  max-width: 62ch;
}
@media (max-width: 900px) {
  [data-site="thaco"] .division-plates { grid-template-columns: 1fr; }
  [data-site="thaco"] .division-plates figure { aspect-ratio: 16 / 10; }
}


/* ---------- metrics ---------- */
[data-site="thaco"] .metrics {
  background: var(--th-surface);
  border-top: 5px solid var(--th-amber-bright);
  padding: 2.75rem 0;
}
[data-site="thaco"] .metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
}
[data-site="thaco"] .metric {
  border-left: 1px solid var(--th-border);
  padding: 0.5rem 1.6rem;
}
[data-site="thaco"] .metric:first-child { border-left: 0; padding-left: 0; }
[data-site="thaco"] .metric dd {
  margin: 0 0 0.2rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 700;
  color: var(--th-steel);
  line-height: 1.05;
}
[data-site="thaco"] .metric dt {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--th-muted);
}

/* ---------- sections ---------- */
[data-site="thaco"] .section { padding: 4rem 0; }
[data-site="thaco"] .section-head { max-width: 44rem; margin-bottom: 2.25rem; }
[data-site="thaco"] .section-head h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
[data-site="thaco"] .section-note { color: var(--th-muted); }
[data-site="thaco"] .footnote { font-size: 0.82rem; color: var(--th-muted); }

/* division panels */
[data-site="thaco"] .div-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
}
[data-site="thaco"] .div-panel {
  position: relative;
  background: var(--th-surface);
  border: 1px solid var(--th-border);
  padding: 1.6rem 1.55rem 1.55rem;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: transform var(--th-t-fast) ease;
}
[data-site="thaco"] .div-panel:hover { transform: translateY(-3px); }
[data-site="thaco"] .div-panel::before,
[data-site="thaco"] .div-panel::after {
  content: "";
  position: absolute;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--th-silver);
  box-shadow: 0 0 0 2px var(--th-surface) inset;
}
[data-site="thaco"] .div-panel::before { top: 10px; left: 10px; }
[data-site="thaco"] .div-panel::after { bottom: 10px; right: 10px; }
[data-site="thaco"] .div-no {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--th-amber);
  letter-spacing: 0.1em;
}
[data-site="thaco"] .div-panel h3 { font-size: 1.2rem; margin: 0.3em 0 0.3em; }
[data-site="thaco"] .div-panel p { margin: 0; color: var(--th-muted); font-size: 0.92rem; }

/* partners */
[data-site="thaco"] .partners { background: #e2e9f0; }
[data-site="thaco"] .partner-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}
[data-site="thaco"] .partner-rail li {
  background: var(--th-surface);
  border: 1px solid var(--th-border);
  border-left: 5px solid var(--th-blue);
  padding: 0.85rem 1.25rem;
  font-weight: 800;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}
[data-site="thaco"] .partner-rail small {
  font-weight: 600;
  color: var(--th-muted);
  font-size: 0.76rem;
}

/* chu lai blueprint */
[data-site="thaco"] .cl-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 3rem;
  align-items: center;
}
[data-site="thaco"] .cl-grid h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
[data-site="thaco"] .cl-list { display: grid; gap: 0.6rem; margin-top: 1.25rem; }
[data-site="thaco"] .cl-list li {
  position: relative;
  padding-left: 1.3rem;
  font-weight: 600;
}
[data-site="thaco"] .cl-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.42em;
  width: 0.6rem; height: 0.6rem;
  border: 2.5px solid var(--th-amber-bright);
  border-radius: 1px;
  transform: rotate(45deg);
}
[data-site="thaco"] .blueprint svg {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--th-border);
  background: #fdfeff;
}

/* history */
[data-site="thaco"] .hist-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}
[data-site="thaco"] .hist-steps li {
  background: var(--th-surface);
  border: 1px solid var(--th-border);
  border-top: 5px solid var(--th-blue);
  padding: 1.4rem 1.35rem;
}
[data-site="thaco"] .h-year {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--th-steel);
  line-height: 1.1;
}
[data-site="thaco"] .hist-steps p { margin: 0.4em 0 0; color: var(--th-muted); font-size: 0.92rem; }

[data-site="thaco"] .fact-card {
  background: var(--th-surface);
  border: 1px solid var(--th-border);
  border-left: 6px solid var(--th-amber-bright);
  padding: 1.5rem 1.6rem;
  display: grid;
  gap: 0.9rem;
  margin: 0;
  max-width: 46rem;
}
[data-site="thaco"] .fact-card div {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 0.75rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px dashed var(--th-border);
}
[data-site="thaco"] .fact-card div:last-child { border-bottom: 0; padding-bottom: 0; }
[data-site="thaco"] .fact-card dt {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--th-muted);
}
[data-site="thaco"] .fact-card dd { margin: 0; font-weight: 600; font-size: 0.95rem; }

/* cta */
[data-site="thaco"] .cta { padding: 4rem 0; }
[data-site="thaco"] .cta-inner {
  background: var(--th-steel);
  padding: 2.75rem 2.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
[data-site="thaco"] .cta-inner h2 { color: #fff; font-size: clamp(1.5rem, 2.8vw, 2.1rem); margin-bottom: 0.3em; }
[data-site="thaco"] .cta-inner p { margin: 0; color: #b8cade; max-width: 34rem; }
[data-site="thaco"] .cta-inner .btn { background: #fff; color: var(--th-steel); }
[data-site="thaco"] .cta-inner .btn:hover { background: #e8eef5; }

/* footer */
[data-site="thaco"] .site-footer {
  background: #10181f;
  color: #b6c5d2;
  padding: 3.25rem 0 2rem;
}
[data-site="thaco"] .footer-brand { display: flex; align-items: baseline; gap: 0.9rem; margin-bottom: 1.4rem; flex-wrap: wrap; }
[data-site="thaco"] .f-name { color: #fff; font-size: 1.35rem; font-weight: 900; letter-spacing: 0.06em; }
[data-site="thaco"] .f-sub { font-size: 0.8rem; color: var(--th-amber-bright); }
[data-site="thaco"] .footer-nav ul { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; margin-bottom: 1.6rem; }
[data-site="thaco"] .footer-nav a { color: #dce6ef; text-decoration: none; font-size: 0.9rem; font-weight: 600; }
[data-site="thaco"] .footer-nav a:hover { color: var(--th-amber-bright); }
[data-site="thaco"] .disclaimer {
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding-top: 1.4rem;
  font-size: 0.82rem;
  color: #9aabb9;
  max-width: 62rem;
}
[data-site="thaco"] .colophon { font-size: 0.75rem; color: #74879a; }

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  [data-site="thaco"] .metrics-grid { grid-template-columns: repeat(2, 1fr); row-gap: 1.4rem; }
  [data-site="thaco"] .metric:nth-child(3) { border-left: 0; padding-left: 0; }
  [data-site="thaco"] .div-grid { grid-template-columns: 1fr 1fr; }
  [data-site="thaco"] .hist-steps { grid-template-columns: 1fr 1fr; }
  [data-site="thaco"] .cl-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  [data-site="thaco"] .nav-toggle { display: flex; }
  [data-site="thaco"] .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--th-surface);
    border-bottom: 1px solid var(--th-border);
    padding: 0.75rem 1.25rem 1.25rem;
  }
  [data-site="thaco"] .main-nav.is-open { display: block; }
  [data-site="thaco"] .main-nav ul { flex-direction: column; gap: 0.25rem; }
  [data-site="thaco"] .header-cta { display: none; }
  [data-site="thaco"] .div-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  [data-site="thaco"] .metrics-grid,
  [data-site="thaco"] .hist-steps { grid-template-columns: 1fr; }
  [data-site="thaco"] .section { padding: 3rem 0; }
  [data-site="thaco"] .fact-card div { grid-template-columns: 1fr; }
  [data-site="thaco"] .cta-inner { flex-direction: column; align-items: flex-start; }
}

/* ---------- motion ---------- */
@media (prefers-reduced-motion: reduce) {
  [data-site="thaco"] * {
    animation: none !important;
    transition: none !important;
  }
}

/* ---------- polish: motion layer (2026+) ---------- */
[data-site="thaco"] .hero-copy {
  animation: th-roll 0.65s cubic-bezier(0.2, 0.7, 0.3, 1) both;
}
[data-site="thaco"] .hero-copy > *:nth-child(2) { animation-delay: 0.09s; }
[data-site="thaco"] .hero-copy > *:nth-child(3) { animation-delay: 0.18s; }
[data-site="thaco"] .hero-copy > *:nth-child(4) { animation-delay: 0.27s; }
[data-site="thaco"] .hero-copy { animation-delay: 0.05s; }
@keyframes th-roll {
  from { transform: translateY(22px); }
}

[data-site="thaco"] .div-panel:hover .div-no {
  display: inline-block;
  animation: th-torque 0.5s ease;
}
@keyframes th-torque {
  40% { transform: rotate(-5deg) translateX(3px); }
}
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    [data-site="thaco"] .section-head,
    [data-site="thaco"] .metrics-grid,
    [data-site="thaco"] .div-grid,
    [data-site="thaco"] .partner-rail,
    [data-site="thaco"] .cl-grid,
    [data-site="thaco"] .hist-steps,
    [data-site="thaco"] .fact-card,
    [data-site="thaco"] .cta-inner {
      animation: th-rise linear both;
      animation-timeline: view();
      animation-range: entry 0% cover 26%;
    }
    @keyframes th-rise {
      from { transform: translateY(30px); }
    }
  }
}

[data-site="thaco"] h1,[data-site="thaco"] h2,[data-site="thaco"] h3,[data-site="thaco"] .brand-name,[data-site="thaco"] .div-no,[data-site="thaco"] .metric dd{font-family:var(--th-display);font-stretch:112%}
[data-site="thaco"] h1{letter-spacing:-.02em}