/* ═══════════════════════════════════════════════════════════════════
   DTH Việt Nam — Nền tảng xây dựng
   Hệ token và nhịp thị giác lấy từ trang tham chiếu (breeze:
   nền #f1f2f3, mực #0b1220, nhấn #2d5e8e, Inter Tight + Fraunces italic)
   ═══════════════════════════════════════════════════════════════════ */
:root {
  /* mặc định: bảng màu Hỏa — nền sáng ấm, nhấn đất nung */
  --bg-0: #faf6f1;
  --bg-1: #f3ebe2;
  --bg-2: #eae0d4;
  --ink-0: #1d1512;
  --ink-1: #3b2c24;
  --ink-2: #6d5b4e;
  --ink-3: #9e8c7e;
  --card-bg: rgba(255, 255, 255, 0.66);
  --card-bg-2: rgba(255, 255, 255, 0.82);
  --line-0: rgba(29, 21, 18, 0.06);
  --line-1: rgba(29, 21, 18, 0.11);
  --line-2: rgba(29, 21, 18, 0.18);
  --accent: #b8451f;
  --accent-2: #cd5b2c;
  --accent-3: #8f3315;
  --hc-green: #2f7d5c;
  --grad: linear-gradient(160deg, #fffdfb 0%, #fdf8f3 45%, #f8efe6 80%, #f4e9dd 100%);
  --warn: #b4531f;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --tight: "Inter Tight", "Inter", ui-sans-serif, system-ui, sans-serif;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --shadow-1: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px -12px rgba(15, 23, 42, 0.14);
  --shadow-2: 0 2px 4px rgba(15, 23, 42, 0.05), 0 24px 48px -20px rgba(15, 23, 42, 0.2);
  --spine: 1440px;
  --pad: clamp(24px, 5vw, 72px);
  color-scheme: light;
}
[data-theme="dark"] {
  --bg-0: #0b1220;
  --bg-1: #111a2c;
  --bg-2: #152238;
  --ink-0: #eff6ff;
  --ink-1: #cfe0f5;
  --ink-2: #94a3b8;
  --ink-3: #7c8ba3;
  --card-bg: rgba(20, 33, 55, 0.55);
  --card-bg-2: rgba(20, 33, 55, 0.78);
  --line-0: rgba(255, 255, 255, 0.06);
  --line-1: rgba(255, 255, 255, 0.1);
  --line-2: rgba(255, 255, 255, 0.18);
  --accent: #6ba2d8;
  --accent-2: #84b3e2;
  --accent-3: #5a90c8;
  --hc-green: #43c495;
  --warn: #e0a06a;
  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -12px rgba(0, 0, 0, 0.5);
  --shadow-2: 0 2px 4px rgba(0, 0, 0, 0.4), 0 24px 48px -20px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background-color: var(--bg-0);
  color: var(--ink-0);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color 0.5s ease, color 0.5s ease;
}
@supports (overflow: clip) { body { overflow-x: clip; } }
section[id], main[id], footer[id] { scroll-margin-top: 88px; }
::selection { background-color: color-mix(in oklab, var(--accent) 26%, transparent); }
img { max-width: 100%; display: block; }

/* ── nền: gradient + mảng mây + nhiễu ─────────────────────────── */
.bg-wrap { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.bg-gradient {
  position: absolute; inset: 0;
  background-image: var(--grad, linear-gradient(160deg, #ffffff 0%, #fbfcfd 45%, #f6f8fa 80%, #f1f2f3 100%));
  transition: background-image 0.5s ease;
}
.bg-blobs { position: absolute; inset: -10%; }
.blob {
  position: absolute; border-radius: 999px; filter: blur(120px);
  animation: breeze 50s ease-in-out infinite alternate;
}
.blob-a { top: -10%; left: -5%; width: 820px; height: 820px; background: radial-gradient(circle, color-mix(in oklab, var(--accent) 12%, transparent), transparent 70%); }
.blob-b { bottom: -15%; right: -10%; width: 900px; height: 900px; background: radial-gradient(circle, color-mix(in oklab, var(--accent) 9%, transparent), transparent 70%); animation-delay: -18s; }
.blob-c { top: 32%; right: 14%; width: 620px; height: 620px; background: radial-gradient(circle, color-mix(in oklab, var(--hc-green) 8%, transparent), transparent 72%); animation-delay: -32s; }
@keyframes breeze {
  0% { transform: translate3d(-3%, -2%, 0) scale(1); }
  50% { transform: translate3d(4%, 3%, 0) scale(1.08); }
  100% { transform: translate3d(-2%, 4%, 0) scale(0.96); }
}
.bg-noise {
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='480' height='480'><filter id='g'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.34 0 0 0 0 0.34 0 0 0 0 0.34 0 0 0 0.7 0'/></filter><rect width='100%25' height='100%25' filter='url(%23g)'/></svg>");
  background-size: 480px 480px; opacity: 0.07; mix-blend-mode: multiply;
}
[data-theme="dark"] .bg-noise { opacity: 0.06; mix-blend-mode: overlay; }
@media (prefers-reduced-motion: reduce) { .blob { animation: none; } }

/* ── loại chữ ─────────────────────────────────────────────────── */
h1, h2, h3, h4 { margin: 0; font-family: var(--tight); font-weight: 600; letter-spacing: -0.026em; line-height: 1.06; text-wrap: balance; }
h1 { font-size: clamp(38px, 5.6vw, 74px); font-weight: 600; letter-spacing: -0.036em; }
h2 { font-size: clamp(30px, 4vw, 54px); font-weight: 600; letter-spacing: -0.032em; }
h3 { font-size: clamp(20px, 2vw, 26px); font-weight: 600; letter-spacing: -0.02em; line-height: 1.18; }
h4 { font-size: 17px; font-weight: 600; letter-spacing: -0.012em; }
em.accent { font-family: var(--serif); font-style: italic; font-weight: 400; color: var(--accent); letter-spacing: -0.01em; }
p { margin: 0; text-wrap: pretty; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
.eyebrow {
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3);
  display: inline-flex; align-items: center; gap: 10px;
  white-space: nowrap;
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: currentColor; opacity: .7; }
.eyebrow.bare::before { display: none; }
.lead { font-size: clamp(16px, 1.35vw, 18.5px); color: var(--ink-2); max-width: 62ch; line-height: 1.66; }
.dim { color: var(--ink-2); }
.mut { color: var(--ink-3); }

/* ── khung trang ──────────────────────────────────────────────── */
main { position: relative; z-index: 4; }
.spine { width: 100%; max-width: var(--spine); margin-inline: auto; padding-inline: var(--pad); }
section { position: relative; }
.sec { padding-block: clamp(72px, 8vw, 132px); }
.sec-tight { padding-block: clamp(52px, 5.5vw, 88px); }
.band { background-color: color-mix(in oklab, var(--bg-1) 70%, transparent); }
.sec-head {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(20px, 4vw, 72px); align-items: end;
  margin-bottom: clamp(34px, 4vw, 60px);
}
.sec-head > .hd h2 { margin-top: 16px; }
@media (max-width: 900px) { .sec-head { grid-template-columns: 1fr; align-items: start; gap: 20px; } }

/* ── thanh điều hướng ─────────────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; height: 64px; z-index: 60;
  display: flex; align-items: center;
  background-color: color-mix(in oklab, var(--bg-0) 74%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line-0);
  transition: background-color .4s, border-color .4s;
}
.nav.scrolled { background-color: color-mix(in oklab, var(--bg-0) 92%, transparent); border-bottom-color: var(--line-1); }
.nav-inner {
  width: 100%; max-width: var(--spine); margin: 0 auto; padding-inline: var(--pad);
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 20px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--tight); font-weight: 600; font-size: 15.5px; letter-spacing: -0.01em; }
.brand-mark {
  width: 32px; height: 32px; flex: none; display: grid; place-items: center;
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
  background-image: linear-gradient(150deg, var(--accent-2), var(--accent-3));
  color: #fff; font-family: var(--tight); font-weight: 600; font-size: 11.5px; letter-spacing: -0.02em;
}
.brand-seg-2 { color: var(--accent); }
.nav-links { display: flex; gap: clamp(14px, 1.7vw, 26px); justify-self: center; }
.nav-links a {
  font-size: 13.5px; font-weight: 500; color: var(--ink-2);
  position: relative; padding-block: 4px; transition: color .2s;
}
.nav-links a:hover { color: var(--ink-0); }
.nav-links a.on { color: var(--accent); }
.nav-links a.on::after {
  content: ""; position: absolute; left: 50%; bottom: -4px; width: 4px; height: 4px;
  border-radius: 999px; background-color: var(--accent); transform: translateX(-50%);
}
.nav-right { display: inline-flex; align-items: center; gap: 8px; }
.lang, .icon-btn {
  height: 34px; border-radius: 10px; border: 1px solid var(--line-1);
  background-color: color-mix(in oklab, var(--bg-1) 50%, transparent);
  color: var(--ink-2); font-size: 12px; padding: 0 11px;
  display: inline-flex; align-items: center; gap: 6px;
  transition: border-color .2s, color .2s, background-color .2s;
}
.lang:hover, .icon-btn:hover { border-color: color-mix(in oklab, var(--accent) 45%, var(--line-1)); color: var(--ink-0); }
.icon-btn { width: 34px; padding: 0; justify-content: center; }
.icon-btn svg { width: 15px; height: 15px; }
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: 999px; background-color: var(--accent); color: #fff;
  font-family: var(--tight); font-size: 13px; font-weight: 500; letter-spacing: -0.005em;
  transition: transform .2s, box-shadow .25s, background-color .25s;
  box-shadow: 0 6px 18px -8px color-mix(in oklab, var(--accent) 60%, transparent);
}
.pill:hover { transform: translateY(-1px); box-shadow: 0 12px 24px -10px color-mix(in oklab, var(--accent) 70%, transparent); }
.pill .arw { transition: transform .2s; }
.pill:hover .arw { transform: translateX(2px); }
.pill.ghost { background: transparent; color: var(--accent); border: 1px solid color-mix(in oklab, var(--accent) 32%, transparent); box-shadow: none; }
.pill.ghost:hover { background-color: color-mix(in oklab, var(--accent) 8%, transparent); }
@media (max-width: 1080px) { .nav-links { display: none; } }
@media (max-width: 620px) { .lang { display: none; } }

.progress { position: fixed; top: 64px; left: 0; right: 0; height: 2px; z-index: 21; pointer-events: none; }
.progress > span {
  display: block; height: 100%; width: 0;
  background-image: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 8px color-mix(in oklab, var(--accent) 50%, transparent);
}
.pager { position: fixed; top: 50%; right: 18px; transform: translateY(-50%); z-index: 15; display: flex; flex-direction: column; gap: 8px; opacity: 0; transition: opacity .4s; pointer-events: none; }
.pager.on { opacity: 1; pointer-events: auto; }
.pager button {
  display: block; width: 8px; height: 8px; border-radius: 999px; padding: 0;
  background-color: color-mix(in oklab, var(--ink-0) 26%, transparent);
  transition: background-color .25s, transform .25s, width .3s; position: relative;
}
.pager button:hover { background-color: color-mix(in oklab, var(--accent) 60%, transparent); transform: scale(1.3); }
.pager button.on { background-color: var(--accent); width: 22px; border-radius: 4px; }
.pager button::after {
  content: attr(data-label); position: absolute; right: calc(100% + 10px); top: 50%;
  transform: translateY(-50%); background-color: var(--ink-0); color: var(--bg-0);
  font-family: var(--mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase;
  padding: 4px 8px; border-radius: 4px; white-space: nowrap; opacity: 0;
  pointer-events: none; transition: opacity .2s;
}
.pager button:hover::after { opacity: 1; }
@media (max-width: 1100px) { .pager { display: none; } }

.float-cta {
  position: fixed; bottom: 20px; right: 20px; z-index: 19;
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px;
  border-radius: 999px; background-color: var(--accent); color: #fff;
  font-family: var(--tight); font-weight: 500; font-size: 13.5px;
  box-shadow: 0 12px 28px -10px color-mix(in oklab, var(--accent) 70%, transparent);
  opacity: 0; transform: translateY(16px) scale(.94); pointer-events: none;
  transition: opacity .45s cubic-bezier(.22,.61,.36,1), transform .45s cubic-bezier(.22,.61,.36,1);
}
.float-cta.on { opacity: 1; transform: none; pointer-events: auto; }
.float-cta:hover { transform: translateY(-2px) scale(1.02); }
.top-btn {
  position: fixed; bottom: 20px; right: 20px; z-index: 18;
  width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center;
  background-color: color-mix(in oklab, #fff 84%, transparent); color: var(--ink-0);
  border: 1px solid var(--line-1); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  box-shadow: var(--shadow-1); opacity: 0; pointer-events: none;
  transform: translateY(20px); transition: opacity .4s, transform .4s, color .2s;
}
[data-theme="dark"] .top-btn { background-color: color-mix(in oklab, #141d30 88%, transparent); color: var(--ink-0); }
.top-btn.on { opacity: 1; transform: none; pointer-events: auto; }
.top-btn:hover { color: var(--accent); }
body.has-float .top-btn { bottom: 74px; }

/* ── khối bìa ─────────────────────────────────────────────────── */
.ver-chip {
  display: inline-flex; align-items: center; gap: 9px; white-space: nowrap;
  border: 1px solid var(--line-1); border-radius: 999px;
  padding: 5px 13px; background-color: color-mix(in oklab, var(--bg-1) 62%, transparent);
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-3);
}
.ver-chip .dot { width: 6px; height: 6px; border-radius: 999px; background-color: var(--hc-green); flex: none; }

.hero { position: relative; z-index: 4; min-height: 100svh; padding: 116px 0 40px; display: flex; align-items: center; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr); gap: clamp(24px, 3.5vw, 56px); align-items: center; width: 100%; }
@media (max-width: 1000px) { .hero-grid { grid-template-columns: 1fr; } }
.hero h1 { margin-block: 20px 22px; }
.hero .lead { max-width: 52ch; }
.cmd-card {
  border: 1px solid var(--line-1); border-radius: var(--r-lg); background-color: var(--card-bg-2);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  padding: 16px 16px 14px; margin-top: 30px; max-width: 460px; box-shadow: var(--shadow-1);
}
.cmd-card .cap { font-family: var(--mono); font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 10px; }
.cmd-row {
  display: flex; align-items: center; gap: 10px;
  background-color: color-mix(in oklab, var(--ink-0) 92%, transparent);
  border-radius: var(--r-md); padding: 9px 10px 9px 12px; margin-bottom: 8px;
}
.cmd-row:last-of-type { margin-bottom: 0; }
[data-theme="dark"] .cmd-row { background-color: rgba(0, 0, 0, 0.42); }
.cmd-tag {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: .1em; text-transform: uppercase;
  color: color-mix(in oklab, #fff 62%, transparent); flex: none;
  border: 1px solid rgba(255, 255, 255, .18); border-radius: 5px; padding: 2px 6px;
}
.cmd-text {
  font-family: var(--mono); font-size: 12.5px; color: #e8eef6;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex: 1;
}
.cmd-copy {
  flex: none; width: 26px; height: 26px; border-radius: 7px; color: rgba(255, 255, 255, .6);
  display: grid; place-items: center; transition: background-color .2s, color .2s;
}
.cmd-copy:hover { background-color: rgba(255, 255, 255, .1); color: #fff; }
.cmd-copy.done { color: var(--hc-green); }
.dl-big {
  display: block; border: 1px solid var(--line-1); border-radius: var(--r-lg);
  background-image: linear-gradient(150deg, color-mix(in oklab, var(--accent) 9%, var(--card-bg-2)), var(--card-bg-2));
  padding: 16px 18px; margin-top: 12px; max-width: 460px;
  transition: transform .25s, box-shadow .3s, border-color .25s; box-shadow: var(--shadow-1);
}
.dl-big:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); border-color: color-mix(in oklab, var(--accent) 30%, var(--line-1)); }
.dl-big .t { font-family: var(--tight); font-size: 16px; font-weight: 600; letter-spacing: -0.015em; display: flex; align-items: center; gap: 9px; }
.dl-big .s { font-size: 12.5px; color: var(--ink-2); margin-top: 5px; line-height: 1.5; }
.dl-big .t svg { color: var(--accent); }
.demo-line { display: flex; align-items: center; gap: 8px; margin-top: 14px; font-size: 13.5px; font-weight: 600; color: var(--accent); }
.demo-line:hover { opacity: .78; }
.os-tabs { display: flex; gap: 6px; margin-top: 26px; flex-wrap: wrap; }
@media (max-width: 480px) { .os-tabs .os-tab { padding: 8px 11px; font-size: 11.5px; } }
.os-tab {
  display: inline-flex; align-items: center; gap: 7px; padding: 9px 14px;
  border: 1px solid var(--line-1); border-radius: 999px; font-size: 12.5px; font-weight: 500;
  white-space: nowrap;
  color: var(--ink-2); background-color: color-mix(in oklab, var(--bg-1) 40%, transparent);
  transition: color .2s, border-color .2s, background-color .2s;
}
.os-tab:hover { color: var(--ink-0); border-color: var(--line-2); }
.os-tab.on { color: var(--accent); border-color: color-mix(in oklab, var(--accent) 40%, transparent); background-color: color-mix(in oklab, var(--accent) 8%, transparent); }
.dl-notes { display: grid; gap: 7px; margin-top: 16px; max-width: 460px; }
.dl-notes div { display: flex; gap: 9px; font-size: 12.5px; color: var(--ink-2); align-items: flex-start; }
.dl-notes svg { color: var(--hc-green); flex: none; margin-top: 3px; }

/* ── tổ ong ───────────────────────────────────────────────────── */
.hc { position: relative; width: 100%; display: flex; justify-content: center; }
.hc-wrap { position: relative; transform-origin: top center; }
.hc-photo { position: absolute; padding: 0; }
.hc-photo image-slot { --is-radius: 0; }
.hc-photo image-slot { width: 100%; height: 100%; display: block; }
.hc-photo::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
  box-shadow: inset 0 0 0 1px var(--line-2);
}
.hc-cell {
  position: absolute;
  display: grid; place-items: center; text-align: center;
  font-family: var(--tight); font-size: 11.5px; font-weight: 500; line-height: 1.16;
  letter-spacing: -0.01em; color: var(--ink-1); padding: 0 13px;
  transition: transform .3s cubic-bezier(.34,1.4,.64,1), color .25s;
  cursor: default;
}
.hc-cell::before {
  content: ""; position: absolute; inset: 0;
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
  background-image: linear-gradient(165deg, rgba(255,255,255,.92), rgba(255,255,255,.62));
  box-shadow: inset 0 0 0 1px var(--line-2);
  transition: none;
}
[data-theme="dark"] .hc-cell::before {
  background-image: linear-gradient(165deg, rgba(255,255,255,.09), rgba(255,255,255,.04));
}
.hc-cell > span { position: relative; z-index: 1; display: block; }
.hc-cell .gl { display: block; font-size: 15px; line-height: 1; color: var(--ink-3); margin-bottom: 5px; transition: color .25s; }
.hc-cell:hover { transform: scale(1.07); color: var(--ink-0); z-index: 3; }
.hc-cell:hover::before { background-image: linear-gradient(165deg, #fff, color-mix(in oklab, var(--accent) 14%, #fff)); }
.hc-cell:hover .gl { color: var(--accent); }
.hc-cell.hot::before { background-color: color-mix(in oklab, var(--hc-green) 16%, #fff); box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--hc-green) 40%, transparent); }
.hc-cell.hot { color: #10704f; }
[data-theme="dark"] .hc-cell.hot { color: var(--hc-green); }
.hc-cell.hot::before { background-color: color-mix(in oklab, var(--hc-green) 18%, transparent); }
.hc-cell.acc::before { background-color: color-mix(in oklab, var(--accent) 14%, #fff); }
[data-theme="dark"] .hc-cell.acc::before { background-color: color-mix(in oklab, var(--accent) 16%, transparent); }
.hc-hub {
  /* kích thước do thuộc tính style gán; tỉ lệ 0.866 giữ lục giác đều */
  position: absolute; display: grid; place-items: center; text-align: center;
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
  background-image: linear-gradient(155deg, var(--accent-2), var(--accent-3));
  color: #fff; z-index: 4; padding: 6% 9%;
  box-shadow: 0 18px 44px -16px color-mix(in oklab, var(--accent) 70%, transparent);
  transition: transform .3s;
}
.hc-hub:hover { transform: scale(1.03); }
.hc-hub b { font-family: var(--tight); font-size: clamp(14px, 1.5vw, 19px); font-weight: 600; letter-spacing: -0.025em; line-height: 1.2; display: block; }
.hc-hub em { font-family: var(--serif); font-style: italic; font-weight: 400; font-size: clamp(10px, .9vw, 12.5px); opacity: .92; display: block; margin-top: 3px; }
.hc-flow { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; pointer-events: none; z-index: 2; }
.hc-flow path { fill: none; stroke: color-mix(in oklab, var(--accent) 24%, transparent); stroke-width: 1; stroke-dasharray: 1 6; stroke-linecap: round; opacity: .5; }
.hc-flow .pulse { stroke: var(--accent); stroke-width: 2; stroke-dasharray: 60 900; stroke-dashoffset: 960; filter: drop-shadow(0 0 6px color-mix(in oklab, var(--accent) 60%, transparent)); animation: flow 4.4s cubic-bezier(.42,.05,.28,.98) infinite; }
.hc-flow .pulse.d1 { animation-delay: .4s; }
.hc-flow .pulse.d2 { animation-delay: 1.1s; }
.hc-flow .pulse.d3 { animation-delay: 1.8s; }
.hc-flow .pulse.d4 { animation-delay: 2.5s; }
.hc-flow .pulse.d5 { animation-delay: 3.2s; }
@keyframes flow { 0% { stroke-dashoffset: 960; opacity: 0; } 8% { opacity: 1; } 92% { opacity: 1; } 100% { stroke-dashoffset: 0; opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .hc-flow .pulse { animation: none; opacity: 0; } }

/* ── video ────────────────────────────────────────────────────── */
.frame-video {
  position: relative; border: 1px solid var(--line-1); border-radius: var(--r-xl);
  overflow: hidden; background: #0b1220; box-shadow: var(--shadow-2);
}
.frame-video .ratio { aspect-ratio: 16 / 9; }
.frame-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; display: block; }
.vid-poster { position: absolute; inset: 0; }
.vid-poster image-slot { position: absolute; inset: 0; width: 100%; height: 100%; }
.vid-cover {
  position: absolute; inset: 0; display: grid; place-items: center; gap: 14px;
  background-image: linear-gradient(180deg, rgba(11,18,32,.28), rgba(11,18,32,.62));
  cursor: pointer; border: 0; color: #fff;
}
.play-btn {
  width: 76px; height: 76px; border-radius: 50%; display: grid; place-items: center;
  background-color: rgba(255, 255, 255, .92); color: #0b1220;
  box-shadow: 0 14px 40px -10px rgba(0, 0, 0, .55);
  transition: transform .28s cubic-bezier(.34,1.4,.64,1);
}
.vid-cover:hover .play-btn { transform: scale(1.08); }
.vid-cover .cap { font-family: var(--mono); font-size: 11px; letter-spacing: .16em; text-transform: uppercase; opacity: .88; }
.vid-meta { display: flex; justify-content: space-between; gap: 16px; margin-top: 14px; font-size: 13px; color: var(--ink-2); flex-wrap: wrap; }
.vid-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: clamp(14px, 2vw, 22px); }
.vid-card {
  border: 1px solid var(--line-1); border-radius: var(--r-lg); overflow: hidden;
  background-color: var(--card-bg); transition: transform .28s, box-shadow .3s, border-color .25s;
}
.vid-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); border-color: var(--line-2); }
.vid-card .thumb { position: relative; aspect-ratio: 16 / 9; background-color: var(--bg-2); overflow: hidden; }
.vid-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.vid-card .thumb .mk {
  position: absolute; inset: 0; display: grid; place-items: center;
  background-image: linear-gradient(180deg, rgba(11,18,32,.1), rgba(11,18,32,.42));
}
.vid-card .thumb .mk span {
  width: 46px; height: 46px; border-radius: 50%; background-color: rgba(255,255,255,.9); color: #0b1220;
  display: grid; place-items: center;
}
.vid-card .body { padding: 13px 15px 15px; }
.vid-card .body h4 { font-size: 14.5px; line-height: 1.35; }
.vid-card .body .meta { font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 7px; }

/* ── thẻ chung ────────────────────────────────────────────────── */
.card {
  border: 1px solid var(--line-1); border-radius: var(--r-lg); background-color: var(--card-bg);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  padding: clamp(18px, 2vw, 24px); display: flex; flex-direction: column; gap: 10px;
  transition: transform .28s, box-shadow .3s, border-color .25s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); border-color: var(--line-2); }
.card .eyebrow { font-size: 10px; }
.card p { font-size: 13.5px; color: var(--ink-2); line-height: 1.56; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(255px, 1fr)); gap: clamp(14px, 1.8vw, 20px); }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: clamp(16px, 2vw, 26px); }

/* ── chu trình 4 bước ─────────────────────────────────────────── */
.step { border-top: 1px solid var(--line-1); padding-block: clamp(40px, 5vw, 72px); }
.step-top { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 22px; }
.step-no {
  font-family: var(--tight); font-size: 13px; font-weight: 600; letter-spacing: .02em;
  color: var(--accent); border: 1px solid color-mix(in oklab, var(--accent) 30%, transparent);
  background-color: color-mix(in oklab, var(--accent) 8%, transparent);
  border-radius: 999px; padding: 5px 12px; font-variant-numeric: tabular-nums;
}
.step-role { font-size: 13px; color: var(--ink-2); font-weight: 500; }
.step-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(24px, 3.4vw, 56px); align-items: start; }
@media (max-width: 1000px) { .step-body { grid-template-columns: 1fr; } }
.step-body h2 { font-size: clamp(28px, 3.2vw, 44px); margin-bottom: 14px; }
.step-art { display: grid; gap: 16px; }
.person-hex { display: flex; align-items: center; gap: 16px; }
.person-hex .hex-photo {
  width: 132px; height: 152px; flex: none;
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
  background-color: var(--bg-2); overflow: hidden;
}
.person-hex .hex-photo image-slot { width: 100%; height: 100%; display: block; }
.person-hex .txt .eyebrow { margin-bottom: 6px; }
.person-hex .txt p { font-size: 13.5px; color: var(--ink-2); }
.quote-badge {
  display: inline-flex; align-items: center; gap: 7px; align-self: flex-start;
  border: 1px solid var(--line-1); border-radius: 999px; padding: 6px 12px;
  font-size: 12px; font-weight: 500; color: var(--ink-1);
  background-color: color-mix(in oklab, var(--bg-1) 60%, transparent);
}
.quote-badge svg { color: var(--warn); }

/* ── lưới mô-đun ──────────────────────────────────────────────── */
.modgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(178px, 1fr)); gap: 1px; background-color: var(--line-1); border: 1px solid var(--line-1); border-radius: var(--r-md); overflow: hidden; }
.modcell { background-color: var(--bg-0); padding: 14px 15px 15px; min-height: 84px; display: flex; flex-direction: column; gap: 3px; transition: background-color .25s; }
[data-theme="dark"] .modcell { background-color: var(--bg-1); }
.modcell:hover { background-color: color-mix(in oklab, var(--accent) 7%, var(--bg-0)); }
.modcell b { font-family: var(--tight); font-size: 13.5px; font-weight: 600; letter-spacing: -0.01em; }
.modcell span { font-size: 11.5px; color: var(--ink-3); }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 22px; }
.tab {
  border: 1px solid var(--line-1); border-radius: 999px; padding: 7px 14px;
  font-size: 12.5px; font-weight: 500; color: var(--ink-2);
  transition: all .22s;
}
.tab:hover { color: var(--ink-0); border-color: var(--line-2); }
.tab.on { color: #fff; background-color: var(--accent); border-color: var(--accent); }

/* ── bảng ─────────────────────────────────────────────────────── */
.tbl { border: 1px solid var(--line-1); border-radius: var(--r-md); overflow: hidden; background-color: var(--card-bg); }
.tbl-row { display: grid; grid-template-columns: minmax(150px, 0.34fr) 1fr; gap: 20px; padding: 13px 17px; border-bottom: 1px solid var(--line-0); font-size: 13.5px; }
.tbl-row:last-child { border-bottom: 0; }
.tbl-row .k { color: var(--ink-3); }
@media (max-width: 640px) { .tbl-row { grid-template-columns: 1fr; gap: 3px; } }
.cmp { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 13.5px; }
.cmp th, .cmp td { text-align: left; padding: 13px 15px; border-bottom: 1px solid var(--line-0); vertical-align: top; }
.cmp th { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; }
.cmp tr:last-child td { border-bottom: 0; }
.cmp td.y { color: var(--hc-green); font-weight: 500; }
.cmp td.n { color: var(--ink-3); }
.cmp-wrap { border: 1px solid var(--line-1); border-radius: var(--r-md); overflow: hidden; background-color: var(--card-bg); }

/* ── ban đối chiếu ────────────────────────────────────────────── */
.vs {
  display: flex; align-items: center; gap: clamp(14px, 3vw, 34px); flex-wrap: wrap;
  border: 1px solid var(--line-1); border-radius: 999px; padding: 16px clamp(20px, 3vw, 34px);
  background-color: var(--card-bg); margin-block: clamp(28px, 4vw, 46px);
}
.vs .lbl { font-family: var(--mono); font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); }
.vs .a { font-size: 14.5px; color: var(--ink-3); text-decoration: line-through; text-decoration-color: color-mix(in oklab, var(--warn) 50%, transparent); }
.vs .b { font-size: 15.5px; font-weight: 600; color: var(--ink-0); font-family: var(--tight); }
.vs .sep { color: var(--ink-3); }

/* ── mô-đun: quy trình 3 bước ─────────────────────────────────── */
.num-row { display: grid; gap: clamp(16px, 2vw, 26px); grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.num-row .no { font-family: var(--tight); font-size: 26px; font-weight: 600; color: color-mix(in oklab, var(--accent) 65%, transparent); font-variant-numeric: tabular-nums; }

/* ── câu hỏi thường gặp ──────────────────────────────────────── */
.faq-item { border-bottom: 1px solid var(--line-1); }
.faq-q { width: 100%; text-align: left; padding: 18px 0; display: flex; gap: 16px; align-items: flex-start; font-family: var(--tight); font-size: 16.5px; font-weight: 600; letter-spacing: -0.015em; }
.faq-q .ic { margin-left: auto; flex: none; color: var(--ink-3); transition: transform .3s, color .2s; margin-top: 4px; }
.faq-q.open .ic { transform: rotate(45deg); color: var(--accent); }
.faq-a { overflow: hidden; max-height: 0; transition: max-height .4s cubic-bezier(.22,.61,.36,1); }
.faq-a > div { padding-bottom: 20px; font-size: 14.5px; color: var(--ink-2); max-width: 78ch; }

/* ── kêu gọi cuối ─────────────────────────────────────────────── */
.cta {
  border: 1px solid var(--line-1); border-radius: var(--r-xl);
  background-image: linear-gradient(155deg, color-mix(in oklab, var(--accent) 10%, var(--card-bg-2)), var(--card-bg-2));
  padding: clamp(30px, 4.4vw, 62px); text-align: center; box-shadow: var(--shadow-1);
}

/* ── chân trang ───────────────────────────────────────────────── */
footer { border-top: 1px solid var(--line-1); background-color: color-mix(in oklab, var(--bg-1) 60%, transparent); padding-block: clamp(44px, 5vw, 70px) 26px; position: relative; z-index: 4; }
.f-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr)); gap: clamp(22px, 3.4vw, 48px); }
@media (max-width: 900px) { .f-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .f-grid { grid-template-columns: 1fr; } }
.f-col h4 { font-family: var(--mono); font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; margin-bottom: 14px; }
.f-col a, .f-col p { display: block; font-size: 13.5px; color: var(--ink-2); margin-bottom: 9px; }
.f-col a:hover { color: var(--accent); }
.f-bot { margin-top: clamp(30px, 4vw, 52px); padding-top: 20px; border-top: 1px solid var(--line-1); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 12.5px; color: var(--ink-3); }

/* ── điều khiển form ──────────────────────────────────────────── */
input, select, textarea {
  font: inherit; font-size: 15px; color: var(--ink-0);
  background-color: var(--card-bg-2); border: 1px solid var(--line-1); border-radius: var(--r-sm);
  padding: 12px 14px; width: 100%; transition: border-color .22s;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); }
textarea { resize: vertical; min-height: 118px; }
label.field { display: grid; gap: 7px; }
label.field > span { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.f2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 620px) { .f2 { grid-template-columns: 1fr; } }

/* ── ô ảnh: chỉnh cho hợp nền sáng ───────────────────────────── */
image-slot {
  --is-fg: rgba(11, 18, 32, 0.55);
  --is-bg: repeating-linear-gradient(135deg, transparent 0 11px, rgba(11,18,32,.05) 11px 12px), rgba(255,255,255,.5);
  --is-ring: rgba(15, 23, 42, 0.16);
  --is-accent: #2d5e8e;
}
[data-theme="dark"] image-slot {
  --is-fg: rgba(239, 246, 255, 0.62);
  --is-bg: repeating-linear-gradient(135deg, transparent 0 11px, rgba(255,255,255,.05) 11px 12px), rgba(255,255,255,.03);
  --is-ring: rgba(255, 255, 255, 0.18);
  --is-accent: #6ba2d8;
}
image-slot::part(empty) { justify-content: flex-end; padding: 14px; }

/* ── tiện ích ─────────────────────────────────────────────────── */
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.center { text-align: center; justify-items: center; }
.mt-s { margin-top: 12px; } .mt-m { margin-top: 22px; } .mt-l { margin-top: 34px; }
.full { width: 100%; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--line-1); border-radius: 999px; padding: 6px 13px;
  font-size: 12.5px; color: var(--ink-2); background-color: color-mix(in oklab, var(--bg-1) 45%, transparent);
}
.hero-anim > * { animation: rise .8s cubic-bezier(.22,1,.36,1) both; }
.hero-anim > *:nth-child(2) { animation-delay: .1s; }
@keyframes rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .hero-anim > * { animation: none; } }


/* ══ thẻ vai trò có ảnh đầu thẻ ══════════════════════════════════ */
.profile-card { padding: 0; overflow: hidden; }
.profile-card .pc-img {
  width: 100%; aspect-ratio: 4 / 3; overflow: hidden; background-color: var(--bg-2);
}
.profile-card h4, .profile-card p { padding-inline: clamp(16px, 1.8vw, 22px); }
.profile-card h4 { padding-top: 16px; }
.profile-card p { padding-bottom: clamp(16px, 1.8vw, 22px); }

/* ══ khối "không cần phòng IT": chữ và ảnh xen kẽ, hình lục giác ══ */
.noit-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: 12px; align-items: center;
}
.hc-cell.noit-txt { position: relative; width: 100%; height: 150px; font-size: 12.5px; }
.noit-hex {
  position: relative; height: 150px; display: flex;
  align-items: center; justify-content: center;
}
.noit-hex image-slot { --is-radius: 0; }
.noit-hex .noit-cap {
  position: absolute; left: 10%; right: 10%; bottom: 9px; text-align: center;
  font-family: var(--tight); font-size: 10.5px; font-weight: 600; line-height: 1.2;
  letter-spacing: -0.01em; color: #fff;
  text-shadow: 0 1px 4px rgba(11, 18, 32, 0.8);
  pointer-events: none; z-index: 2;
}
@media (max-width: 760px) { .noit-grid { grid-template-columns: repeat(2, 1fr); } }

/* ══ cẩm nang: lưới thẻ như trang gốc ══════════════════════════ */
.country-row {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px 11px;
  padding-block: 14px 20px; margin-bottom: 30px;
  border-top: 1px solid var(--line-1); border-bottom: 1px solid var(--line-1);
}
.cr-lbl {
  font-family: var(--mono); font-size: 10px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--ink-3);
  margin-right: 8px; white-space: nowrap;
}
.cr-chip { display: inline-flex; align-items: center; gap: 6px; font-size: 11.5px; color: var(--ink-2); white-space: nowrap; }
.cr-chip b {
  font-family: var(--mono); font-size: 9.5px; font-weight: 500; color: var(--ink-3);
  border: 1px solid var(--line-1); border-radius: 4px; padding: 0 4px; line-height: 1.55;
}

.pb-head { max-width: 64ch; margin-bottom: 24px; display: grid; gap: 13px; }
.pb-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 1180px) { .pb-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
@media (max-width: 940px)  { .pb-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 700px)  { .pb-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 440px)  { .pb-grid { grid-template-columns: 1fr; } }

.pb-card {
  --pc: var(--accent);
  display: flex; flex-direction: column; overflow: hidden;
  border: 1px solid var(--line-1); border-radius: var(--r-md);
  background-color: color-mix(in oklab, #fff 74%, transparent);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
  transition: transform .28s cubic-bezier(.22,1,.36,1), box-shadow .3s, border-color .25s;
}
[data-theme="dark"] .pb-card { background-color: var(--card-bg); }
.pb-card:hover {
  transform: translateY(-3px); box-shadow: var(--shadow-2);
  border-color: color-mix(in oklab, var(--pc) 40%, var(--line-1));
}
.pb-art {
  position: relative; aspect-ratio: 16 / 10; overflow: hidden;
  background-image: linear-gradient(150deg, color-mix(in oklab, var(--pc) 13%, #fff), color-mix(in oklab, var(--pc) 4%, #fff));
  border-bottom: 1px solid var(--line-0);
}
[data-theme="dark"] .pb-art {
  background-image: linear-gradient(150deg, color-mix(in oklab, var(--pc) 24%, #0b1220), color-mix(in oklab, var(--pc) 8%, #0b1220));
}
.pb-shot {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; opacity: .92; mix-blend-mode: multiply;
}
[data-theme="dark"] .pb-shot { mix-blend-mode: normal; opacity: .8; }
.pb-face {
  position: absolute; left: 10px; bottom: 10px; width: 44px; height: 44px;
  border-radius: 999px; overflow: hidden; background-color: var(--bg-2); z-index: 2;
  box-shadow: 0 2px 10px rgba(15,23,42,.25), 0 0 0 2px rgba(255,255,255,.85);
}
[data-theme="dark"] .pb-face { box-shadow: 0 2px 10px rgba(0,0,0,.45), 0 0 0 2px rgba(255,255,255,.16); }
.pb-face image-slot { --is-radius: 999px; }
.pb-body { padding: 13px 14px 0; display: grid; gap: 7px; }
.pb-cat {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 9.5px; letter-spacing: .09em;
  color: var(--pc); font-weight: 500; line-height: 1.35;
}
.pb-gl { font-size: 11px; line-height: 1; }
.pb-body h4 { font-size: 14.5px; line-height: 1.3; }
.pb-body p {
  font-size: 12.5px; color: var(--ink-2); line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.pb-foot {
  margin-top: auto; padding: 12px 14px 13px;
  display: flex; align-items: center; gap: 11px;
  border-top: 1px solid var(--line-0);
}
.pb-meta { display: inline-flex; align-items: center; gap: 5px; font-size: 11.5px; color: var(--ink-3); }
.pb-meta .pb-gl { color: var(--ink-3); }
.pb-go { margin-left: auto; color: var(--ink-3); transition: transform .25s, color .25s; }
.pb-card:hover .pb-go { color: var(--pc); transform: translateX(3px); }

/* ảnh phẳng trong các ô nhỏ — dùng thẻ img để chắc chắn hiển thị */
.pb-face img { width: 100%; height: 100%; object-fit: cover; display: block; }
.noit-hex img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
}
.profile-card .pc-img img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* ══ lọc ấm: kéo ảnh về cùng tông Hỏa của bảng màu ═════════════ */
body.grade-warm .pb-shot,
body.grade-warm .pb-face img,
body.grade-warm .noit-hex img,
body.grade-warm .profile-card .pc-img img {
  filter: sepia(.20) saturate(.92) contrast(1.03) brightness(1.02);
}
body.grade-warm image-slot {
  filter: sepia(.14) saturate(.95) contrast(1.02);
}
body.grade-warm .pb-shot { mix-blend-mode: normal; opacity: 1; }
body.grade-warm .hc-cell::before { background-image: linear-gradient(165deg, rgba(255,252,248,.94), rgba(253,246,238,.68)); }
[data-theme="dark"] body.grade-warm .hc-cell::before {
  background-image: linear-gradient(165deg, rgba(255,255,255,.09), rgba(255,255,255,.04));
}

/* ══ dải ứng dụng AI — nối khối bìa với phần còn lại ══════════ */
.ai-strip {
  position: relative; z-index: 4;
  border-top: 1px solid var(--line-1); border-bottom: 1px solid var(--line-1);
  background-color: color-mix(in oklab, var(--accent) 5%, transparent);
  padding-block: clamp(22px, 3vw, 34px);
}
.strip-head {
  display: flex; align-items: center; gap: clamp(12px, 2vw, 26px);
  flex-wrap: wrap; margin-bottom: 18px;
}
.strip-chip {
  flex: none;
  font-family: var(--mono); font-size: 10px; letter-spacing: .18em;
  color: #fff; background-color: var(--accent);
  border-radius: 999px; padding: 5px 13px;
}
.strip-head p { font-size: 14.5px; color: var(--ink-2); flex: 1; min-width: 260px; }
.strip-head p b { color: var(--ink-0); font-weight: 600; }
.strip-link {
  display: inline-flex; align-items: center; gap: 7px; flex: none;
  font-size: 13.5px; font-weight: 600; color: var(--accent);
}
.strip-link svg { transition: transform .25s; }
.strip-link:hover svg { transform: translateX(3px); }
.strip-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(178px, 1fr));
  gap: 1px; background-color: var(--line-1);
  border: 1px solid var(--line-1); border-radius: var(--r-md); overflow: hidden;
}
.strip-cell {
  background-color: var(--bg-0); padding: 13px 14px 14px;
  display: flex; flex-direction: column; gap: 3px;
}
.strip-cell b { font-family: var(--tight); font-size: 13.5px; font-weight: 600; letter-spacing: -0.01em; }
.strip-cell span { font-size: 11.5px; color: var(--ink-3); }

/* ══ khối ứng dụng AI ════════════════════════════════════════ */
.ai-sec { position: relative; overflow: hidden; }
.ai-glow {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    radial-gradient(58% 42% at 82% 6%, color-mix(in oklab, var(--accent) 11%, transparent), transparent 70%),
    radial-gradient(46% 38% at 6% 92%, color-mix(in oklab, var(--hc-green) 9%, transparent), transparent 72%);
}
.ai-sec > .spine { position: relative; }

.ai-principle {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(20px, 3vw, 46px); align-items: center;
  border: 1px solid color-mix(in oklab, var(--accent) 26%, var(--line-1));
  border-radius: var(--r-lg); padding: clamp(20px, 2.6vw, 32px);
  background-image: linear-gradient(150deg, color-mix(in oklab, var(--accent) 7%, var(--card-bg-2)), var(--card-bg-2));
  margin-bottom: clamp(26px, 3.4vw, 44px);
}
.ai-principle h3 { font-size: clamp(20px, 2.1vw, 27px); }
.ai-principle p { font-size: 14.5px; color: var(--ink-2); margin-top: 10px; max-width: 52ch; }
.aip-marks { display: grid; gap: 1px; background-color: var(--line-1); border: 1px solid var(--line-1); border-radius: var(--r-md); overflow: hidden; }
.aip-mark { background-color: var(--bg-0); padding: 13px 15px; display: grid; gap: 3px; }
.aip-mark b {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--accent); font-weight: 500;
}
.aip-mark span { font-size: 13px; color: var(--ink-2); }
@media (max-width: 900px) { .ai-principle { grid-template-columns: 1fr; } }

.ai-stages { display: grid; grid-template-columns: repeat(auto-fill, minmax(252px, 1fr)); gap: clamp(12px, 1.6vw, 18px); }
.ai-stage {
  border: 1px solid var(--line-1); border-radius: var(--r-md);
  background-color: var(--card-bg); padding: 16px 17px 18px;
  display: flex; flex-direction: column; gap: 9px;
  transition: transform .28s, box-shadow .3s, border-color .25s;
}
.ai-stage:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); border-color: color-mix(in oklab, var(--accent) 34%, var(--line-1)); }
.ais-top { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.ais-no {
  font-family: var(--mono); font-size: 10.5px; font-weight: 500;
  color: #fff; background-color: var(--accent);
  border-radius: 5px; padding: 2px 7px; font-variant-numeric: tabular-nums;
}
.ais-tag {
  font-family: var(--mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-2); border: 1px solid var(--line-1); border-radius: 999px; padding: 2px 9px;
}
.ais-who { font-size: 11.5px; color: var(--ink-3); margin-left: auto; }
.ai-stage h4 { font-size: 15.5px; line-height: 1.3; }
.ai-stage p { font-size: 13px; color: var(--ink-2); line-height: 1.52; }

.ai-auto {
  margin-top: clamp(26px, 3.4vw, 44px);
  border-top: 1px solid var(--line-1); padding-top: clamp(22px, 3vw, 34px);
}
.aia-head { margin-bottom: 18px; display: grid; gap: 10px; max-width: 56ch; }
.aia-head h3 { font-size: clamp(19px, 2vw, 25px); }
.aia-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(238px, 1fr)); gap: 11px 20px; }
.aia-item { display: flex; align-items: center; gap: 10px; font-size: 13.5px; color: var(--ink-1); }
.aia-tick {
  flex: none; width: 20px; height: 20px; border-radius: 999px;
  display: grid; place-items: center;
  background-color: color-mix(in oklab, var(--hc-green) 16%, transparent);
  color: var(--hc-green);
}

/* dòng AI trong mỗi bước chu trình */
.ai-line {
  display: flex; gap: 11px; align-items: flex-start;
  margin-top: 18px; padding: 12px 15px;
  border: 1px solid color-mix(in oklab, var(--accent) 24%, var(--line-1));
  border-radius: var(--r-sm);
  background-color: color-mix(in oklab, var(--accent) 6%, transparent);
  font-size: 13.5px; color: var(--ink-1); max-width: 62ch;
}
.ai-chip {
  flex: none; font-family: var(--mono); font-size: 10px; letter-spacing: .12em;
  color: #fff; background-color: var(--accent);
  border-radius: 5px; padding: 2px 7px; margin-top: 2px;
}

/* ══ bổ sung cho khối ứng dụng AI ══════════════════════════════ */
.step-ai {
  font-family: var(--mono); font-size: 10px; letter-spacing: .12em;
  text-transform: uppercase; color: #fff; background-color: var(--accent);
  border-radius: 999px; padding: 3px 10px; flex: none;
}