/* ==========================================================================
   Hoàng Phi Long — Design System
   Palette: trắng / đen / cam / vàng chanh
   ========================================================================== */

:root {
  /* Neutrals */
  --white: #ffffff;
  --paper: #f7f7f2;
  --paper-2: #efefe7;
  --ink: #0b0b0c;
  --ink-2: #1b1b20;
  --ink-soft: #33333b;
  --muted: #6a6a73;
  --line: #e6e6dd;
  --line-strong: #d6d6cb;

  /* Brand */
  --orange: #ff6a1a;
  --orange-deep: #e8530a;
  --orange-soft: #fff1e8;
  --lime: #d4f829;
  --lime-deep: #b9dc12;
  --lime-soft: #f6fdd6;

  /* Semantic */
  --bg: var(--white);
  --fg: var(--ink);

  /* Typography */
  --font: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --h1: clamp(2.25rem, 1.2rem + 4.4vw, 4rem);
  --h2: clamp(1.7rem, 1.1rem + 2.4vw, 2.75rem);
  --h3: clamp(1.25rem, 1rem + 1vw, 1.6rem);
  --lead: clamp(1.05rem, 0.98rem + 0.4vw, 1.3rem);

  /* Layout */
  --container: 1180px;
  --container-narrow: 820px;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 26px;
  --gap: clamp(1.25rem, 0.8rem + 1.6vw, 2.25rem);
  --section-y: clamp(3.5rem, 2rem + 6vw, 7rem);
  --shadow: 0 1px 2px rgba(11, 11, 12, .04), 0 12px 30px -18px rgba(11, 11, 12, .28);
  --shadow-lift: 0 20px 46px -22px rgba(11, 11, 12, .38);
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ------------------------------ Reset ---------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
body {
  font-family: var(--font);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.65;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
ul, ol { padding: 0; list-style: none; }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; border-radius: 4px; }
::selection { background: var(--lime); color: var(--ink); }

/* --------------------------- Typography -------------------------------- */
h1, h2, h3, h4 { line-height: 1.12; font-weight: 800; letter-spacing: -.02em; color: var(--ink); }
h1 { font-size: var(--h1); }
h2 { font-size: var(--h2); }
h3 { font-size: var(--h3); font-weight: 700; }
p { color: var(--ink-soft); }
strong { font-weight: 700; color: var(--ink); }
.lead { font-size: var(--lead); color: var(--ink-soft); font-weight: 400; }
.muted { color: var(--muted); }

/* ---------------------------- Layout ----------------------------------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: clamp(1.1rem, .5rem + 2vw, 2rem); }
.narrow { max-width: var(--container-narrow); }
.section { padding-block: var(--section-y); }
.section-sm { padding-block: clamp(2.5rem, 1.5rem + 4vw, 4.5rem); }
.center { text-align: center; }
.grid { display: grid; gap: var(--gap); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .cols-3, .cols-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; } }

/* Sections on tinted backgrounds */
.bg-paper { background: var(--paper); }
.bg-ink { background: var(--ink); color: #ececef; }
.bg-ink h1, .bg-ink h2, .bg-ink h3 { color: #fff; }
.bg-ink p { color: #c4c4cc; }
.bg-lime { background: var(--lime); }
.bg-orange { background: var(--orange); color: #fff; }
.bg-orange h2, .bg-orange h3 { color: #fff; }
.bg-orange p { color: #fff2ea; }

/* ---------------------------- Eyebrow ---------------------------------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-size: .78rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: var(--orange-deep);
  padding: .35rem .7rem; border-radius: 999px;
  background: var(--orange-soft); border: 1px solid #ffd9c2;
  margin-bottom: 1.1rem;
}
.eyebrow.lime { color: #5c6b00; background: var(--lime-soft); border-color: #e3f39a; }
.bg-ink .eyebrow { background: rgba(212, 248, 41, .14); border-color: rgba(212, 248, 41, .3); color: var(--lime); }

/* ---------------------------- Buttons ---------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .55rem;
  font-weight: 700; font-size: 1rem; line-height: 1;
  padding: .95rem 1.5rem; border-radius: 999px; border: 2px solid transparent;
  cursor: pointer; transition: transform .18s var(--ease), background .18s var(--ease), box-shadow .18s var(--ease), color .18s var(--ease);
  white-space: nowrap;
}
.btn svg { width: 1.1em; height: 1.1em; }
.btn-primary { background: var(--orange); color: #fff; box-shadow: 0 10px 24px -12px rgba(255, 106, 26, .8); }
.btn-primary:hover { background: var(--orange-deep); transform: translateY(-2px); }
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { background: var(--ink-2); transform: translateY(-2px); }
.btn-lime { background: var(--lime); color: var(--ink); }
.btn-lime:hover { background: var(--lime-deep); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--ink); transform: translateY(-2px); }
.bg-ink .btn-ghost, .hero .btn-ghost, .page-hero .btn-ghost, .cta-band .btn-ghost { color: #fff; border-color: rgba(255, 255, 255, .28); }
.bg-ink .btn-ghost:hover, .hero .btn-ghost:hover, .page-hero .btn-ghost:hover, .cta-band .btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .06); }
.btn-block { width: 100%; }
.btn-lg { padding: 1.1rem 1.9rem; font-size: 1.06rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: .8rem; }

.text-link { color: var(--orange-deep); font-weight: 700; display: inline-flex; align-items: center; gap: .35rem; }
.text-link:hover { text-decoration: underline; text-underline-offset: 3px; }
.text-link .arrow { transition: transform .2s var(--ease); }
.text-link:hover .arrow { transform: translateX(3px); }

/* ---------------------------- Header ----------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: .6rem; font-weight: 800; letter-spacing: -.02em; font-size: 1.12rem; color: var(--ink); }
.brand .mark { width: 34px; height: 34px; flex: none; }
.brand small { display: block; font-size: .62rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); margin-top: 1px; }
.nav-links { display: flex; align-items: center; gap: .3rem; }
.nav-links a {
  font-size: .93rem; font-weight: 600; color: var(--ink-soft);
  padding: .5rem .7rem; border-radius: 8px; transition: color .15s, background .15s;
}
.nav-links a:hover { color: var(--ink); background: var(--paper); }
.nav-links a.active { color: var(--orange-deep); }
.nav-links > .btn { display: none; }
.nav-cta { display: flex; align-items: center; gap: .5rem; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: .4rem; }
.nav-toggle svg { width: 26px; height: 26px; }

/* Dropdown */
.has-drop { position: relative; }
.drop {
  position: absolute; top: calc(100% + 8px); left: 0; min-width: 260px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: .5rem; opacity: 0; visibility: hidden; transform: translateY(6px);
  transition: opacity .16s var(--ease), transform .16s var(--ease), visibility .16s;
}
.has-drop:hover .drop, .has-drop:focus-within .drop { opacity: 1; visibility: visible; transform: translateY(0); }
.drop a { display: block; padding: .6rem .7rem; border-radius: 10px; font-size: .92rem; }
.drop a strong { display: block; font-size: .95rem; }
.drop a span { font-size: .8rem; color: var(--muted); }
.drop a:hover { background: var(--paper); }

@media (max-width: 940px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed; inset: 68px 0 auto 0; flex-direction: column; align-items: stretch;
    background: #fff; border-bottom: 1px solid var(--line); padding: 1rem clamp(1.1rem, 5vw, 2rem) 1.5rem;
    gap: .15rem; transform: translateY(-140%); transition: transform .28s var(--ease); box-shadow: var(--shadow);
    max-height: calc(100vh - 68px); overflow-y: auto;
  }
  .nav[data-open="true"] .nav-links { transform: translateY(0); }
  .nav-links a { padding: .8rem .5rem; font-size: 1.02rem; border-bottom: 1px solid var(--line); border-radius: 0; }
  .nav-links > .btn { display: inline-flex; margin-top: .9rem; }
  .drop { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: 0; padding: 0 0 .4rem .8rem; min-width: 0; }
  .drop a { padding: .55rem .5rem; border-bottom: 0; }
  .nav-cta .btn { display: none; }
}

/* ----------------------------- Hero ------------------------------------ */
.hero { position: relative; overflow: hidden; background: var(--ink); color: #ececef; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(60% 55% at 82% 12%, rgba(255, 106, 26, .28), transparent 60%),
    radial-gradient(50% 50% at 8% 90%, rgba(212, 248, 41, .18), transparent 60%);
}
.hero .container { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(2rem, 1rem + 4vw, 4rem); align-items: center; padding-block: clamp(3.5rem, 2rem + 6vw, 6.5rem); }
.hero h1 { color: #fff; }
.hero h1 .hl { color: var(--lime); }
.hero .lead { color: #c8c8d0; max-width: 42ch; }
@media (max-width: 860px) { .hero-grid { grid-template-columns: 1fr; } }

/* Page hero (inner) */
.page-hero { background: var(--ink); color: #fff; padding-block: clamp(2.6rem, 1.6rem + 4vw, 4.4rem); position: relative; overflow: hidden; }
.page-hero::before { content: ""; position: absolute; inset: 0; background: radial-gradient(50% 60% at 88% 20%, rgba(255, 106, 26, .25), transparent 62%); }
.page-hero .container { position: relative; }
.page-hero h1 { color: #fff; max-width: 20ch; }
.page-hero .lead { color: #c8c8d0; max-width: 60ch; margin-top: 1rem; }
.page-hero .btn-row { margin-top: 1.6rem; }

/* Breadcrumb */
.crumbs { display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; font-size: .82rem; color: var(--muted); margin-bottom: 1rem; }
.crumbs a { color: #cfcfd6; }
.page-hero .crumbs a { color: #bdbdc6; }
.page-hero .crumbs { color: #8f8f9a; }
.crumbs a:hover { color: var(--orange); }
.crumbs .sep { opacity: .5; }

/* ----------------------------- Cards ----------------------------------- */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(1.3rem, 1rem + 1vw, 1.9rem);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease);
  height: 100%;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); border-color: var(--line-strong); }
.card h3 { margin-bottom: .5rem; }
.card p { font-size: .97rem; }
.card .ico { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 1rem; background: var(--orange-soft); color: var(--orange-deep); }
.card .ico.lime { background: var(--lime-soft); color: #6a7d00; }
.card .ico.ink { background: var(--ink); color: var(--lime); }
.card .ico svg { width: 26px; height: 26px; }
.card-link { position: relative; }
.card-link::after { content: ""; position: absolute; inset: 0; }
.card-tag { font-size: .74rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--orange-deep); }

/* Feature card (pillar) */
.pillar { display: flex; flex-direction: column; gap: .2rem; border-top: 4px solid var(--orange); }
.pillar:nth-child(2) { border-top-color: var(--lime-deep); }
.pillar:nth-child(3) { border-top-color: var(--ink); }
.pillar .num { font-size: .8rem; font-weight: 800; color: var(--muted); letter-spacing: .1em; }
.pillar ul { margin-top: .8rem; display: grid; gap: .45rem; }
.pillar ul li { position: relative; padding-left: 1.5rem; font-size: .93rem; color: var(--ink-soft); }
.pillar ul li::before { content: ""; position: absolute; left: 0; top: .55em; width: 8px; height: 8px; border-radius: 3px; background: var(--orange); }

/* --------------------------- Prose / article --------------------------- */
.prose { max-width: 72ch; }
.prose > * + * { margin-top: 1.15rem; }
.prose h2 { margin-top: 2.6rem; }
.prose h3 { margin-top: 1.8rem; }
.prose p, .prose li { font-size: 1.06rem; color: var(--ink-soft); }
.prose ul, .prose ol { display: grid; gap: .55rem; padding-left: 0; }
.prose ul li { position: relative; padding-left: 1.6rem; }
.prose ul li::before { content: ""; position: absolute; left: .1rem; top: .68em; width: 8px; height: 8px; background: var(--orange); border-radius: 3px; }
.prose ol { counter-reset: n; }
.prose ol li { position: relative; padding-left: 2.2rem; counter-increment: n; }
.prose ol li::before { content: counter(n); position: absolute; left: 0; top: .05em; width: 1.6rem; height: 1.6rem; background: var(--ink); color: var(--lime); font-size: .85rem; font-weight: 700; border-radius: 8px; display: grid; place-items: center; }
.prose a { color: var(--orange-deep); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; text-decoration-color: #ffcbab; }
.prose a:hover { text-decoration-color: var(--orange); }
.prose blockquote { border-left: 4px solid var(--lime-deep); background: var(--paper); padding: 1rem 1.3rem; border-radius: 0 12px 12px 0; font-size: 1.1rem; font-style: italic; color: var(--ink); }

/* TL;DR / key takeaways box (good for GEO) */
.tldr { background: var(--lime-soft); border: 1px solid #e3f39a; border-radius: var(--radius); padding: 1.3rem 1.5rem; }
.tldr h2, .tldr h3 { font-size: 1rem; text-transform: uppercase; letter-spacing: .1em; color: #5c6b00; margin: 0 0 .7rem; }
.tldr ul { display: grid; gap: .5rem; }
.tldr ul li { position: relative; padding-left: 1.7rem; font-size: .98rem; color: var(--ink-soft); }
.tldr ul li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--lime-deep); font-weight: 800; }

.callout { border: 1px solid var(--line); border-left: 4px solid var(--orange); background: var(--orange-soft); border-radius: 0 12px 12px 0; padding: 1.1rem 1.3rem; }
.callout p { color: var(--ink-soft); }

/* ------------------------------ Steps ---------------------------------- */
.steps { display: grid; gap: 1rem; counter-reset: step; }
.step { display: grid; grid-template-columns: auto 1fr; gap: 1.1rem; align-items: start; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem 1.4rem; }
.step .idx { counter-increment: step; width: 44px; height: 44px; flex: none; border-radius: 12px; background: var(--ink); color: var(--lime); font-weight: 800; display: grid; place-items: center; }
.step .idx::before { content: counter(step, decimal-leading-zero); }
.step h3 { margin-bottom: .25rem; }

/* --------------------------- Price / offer ----------------------------- */
.price-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: clamp(1.5rem, 1rem + 2vw, 2.4rem); position: relative; height: 100%; display: flex; flex-direction: column; }
.price-card.featured { border-color: var(--orange); box-shadow: var(--shadow-lift); }
.price-card .badge { position: absolute; top: -12px; left: 1.6rem; background: var(--orange); color: #fff; font-size: .74rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: .35rem .8rem; border-radius: 999px; }
.price-card .tier { font-size: .82rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
.price-card .amount { font-size: clamp(2rem, 1.4rem + 2vw, 2.8rem); font-weight: 800; color: var(--ink); letter-spacing: -.02em; margin: .3rem 0 .1rem; }
.price-card .amount small { font-size: .95rem; font-weight: 600; color: var(--muted); }
.price-card ul { display: grid; gap: .6rem; margin: 1.2rem 0 1.6rem; }
.price-card ul li { position: relative; padding-left: 1.8rem; font-size: .96rem; color: var(--ink-soft); }
.price-card ul li::before { content: ""; position: absolute; left: 0; top: .35em; width: 18px; height: 18px; border-radius: 50%; background: var(--lime-soft); }
.price-card ul li::after { content: "✓"; position: absolute; left: .28em; top: .1em; color: var(--lime-deep); font-weight: 800; font-size: .8rem; }
.price-card .btn { margin-top: auto; }

/* ------------------------------ Stat / marquee ------------------------- */
.chips { display: flex; flex-wrap: wrap; gap: .6rem; }
.chip { font-size: .84rem; font-weight: 600; padding: .45rem .9rem; border-radius: 999px; background: var(--paper); border: 1px solid var(--line); color: var(--ink-soft); }
.bg-ink .chip { background: rgba(255, 255, 255, .06); border-color: rgba(255, 255, 255, .14); color: #dcdce2; }

.logo-mark-lg { width: min(320px, 80%); }

/* ------------------------------- FAQ ----------------------------------- */
.faq { display: grid; gap: .8rem; max-width: 820px; margin-inline: auto; }
.faq-item { border: 1px solid var(--line); border-radius: var(--radius); background: #fff; overflow: hidden; }
.faq-q { width: 100%; text-align: left; background: none; border: 0; cursor: pointer; padding: 1.1rem 1.3rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; font-weight: 700; font-size: 1.03rem; color: var(--ink); }
.faq-q:hover { background: var(--paper); }
.faq-q .plus { flex: none; width: 26px; height: 26px; border-radius: 50%; background: var(--orange-soft); color: var(--orange-deep); display: grid; place-items: center; font-weight: 800; transition: transform .2s var(--ease), background .2s; }
.faq-item[data-open="true"] .faq-q .plus { transform: rotate(45deg); background: var(--orange); color: #fff; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s var(--ease); }
.faq-a-inner { padding: 0 1.3rem 1.2rem; color: var(--ink-soft); }
.faq-item[data-open="true"] .faq-a { max-height: 520px; }

/* ------------------------------- CTA band ------------------------------ */
.cta-band { background: var(--ink); color: #fff; border-radius: var(--radius-lg); padding: clamp(2rem, 1.4rem + 3vw, 3.6rem); text-align: center; position: relative; overflow: hidden; }
.cta-band::before { content: ""; position: absolute; inset: 0; background: radial-gradient(50% 120% at 50% -20%, rgba(255, 106, 26, .35), transparent 60%); }
.cta-band > * { position: relative; }
.cta-band h2 { color: #fff; max-width: 22ch; margin-inline: auto; }
.cta-band p { color: #c8c8d0; max-width: 54ch; margin: 1rem auto 0; }
.cta-band .btn-row { justify-content: center; margin-top: 1.8rem; }

/* ------------------------------- Footer -------------------------------- */
.site-footer { background: var(--ink); color: #b7b7c0; padding-block: clamp(3rem, 2rem + 3vw, 4.5rem) 2rem; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 2rem; }
@media (max-width: 820px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer .brand { color: #fff; }
.site-footer .brand small { color: #8a8a95; }
.footer-about p { color: #9a9aa4; font-size: .93rem; margin-top: 1rem; max-width: 34ch; }
.footer-col h4 { color: #fff; font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 1rem; }
.footer-col a { display: block; padding: .32rem 0; color: #adadb7; font-size: .93rem; }
.footer-col a:hover { color: var(--orange); }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center; border-top: 1px solid rgba(255, 255, 255, .1); margin-top: 2.6rem; padding-top: 1.6rem; font-size: .85rem; color: #83838e; }
.social { display: flex; gap: .6rem; }
.social a { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; background: rgba(255, 255, 255, .06); color: #cfcfd6; transition: background .18s, color .18s, transform .18s; }
.social a:hover { background: var(--orange); color: #fff; transform: translateY(-2px); }
.social svg { width: 18px; height: 18px; }

/* ------------------------------ Utilities ------------------------------ */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-2 { margin-bottom: 1rem; }
.stack > * + * { margin-top: 1.1rem; }
.maxw-sm { max-width: 46ch; }
.flow-lg > * + * { margin-top: 1.6rem; }
.hr { height: 1px; background: var(--line); border: 0; margin-block: clamp(2rem, 1rem + 3vw, 3.5rem); }
.pill-list { display: flex; flex-wrap: wrap; gap: .5rem; }
.two-col-text { columns: 2; column-gap: 2.5rem; }
@media (max-width: 700px) { .two-col-text { columns: 1; } }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

.skip-link { position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff; padding: .7rem 1rem; z-index: 100; border-radius: 0 0 8px 0; }
.skip-link:focus { left: 0; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 1rem + 4vw, 4rem); align-items: center; }
@media (max-width: 820px) { .split { grid-template-columns: 1fr; } }

.media-frame { border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--line); background: var(--paper); }
.aspect { position: relative; aspect-ratio: 4 / 3; }
.aspect > * { position: absolute; inset: 0; width: 100%; height: 100%; }

/* ------------------- Hero roster card (AI team) ------------------------ */
.roster-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, .06), rgba(255, 255, 255, .02));
  border: 1px solid rgba(255, 255, 255, .14); border-radius: var(--radius-lg);
  padding: 1.3rem; box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .7); backdrop-filter: blur(4px);
}
.roster-head { display: flex; align-items: center; gap: .55rem; padding-bottom: 1rem; border-bottom: 1px solid rgba(255, 255, 255, .12); }
.roster-head strong { color: #fff; font-size: 1rem; }
.roster-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 4px rgba(212, 248, 41, .18); }
.roster-live { margin-left: auto; font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--lime); }
.roster-list { display: grid; gap: .5rem; margin: 1rem 0; }
.roster-list li { display: flex; align-items: center; gap: .7rem; background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .08); border-radius: 12px; padding: .6rem .8rem; color: #e6e6ea; font-size: .92rem; font-weight: 600; }
.roster-list .r-ic { font-size: 1.1rem; }
.roster-list .r-tag { margin-left: auto; font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: #0b0b0c; background: var(--lime); padding: .18rem .5rem; border-radius: 999px; }
.roster-foot { display: flex; align-items: center; justify-content: space-between; padding-top: 1rem; border-top: 1px solid rgba(255, 255, 255, .12); }
.roster-foot span { font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; color: #9a9aa4; }
.roster-foot strong { color: var(--orange); font-size: 1.15rem; }

/* ------------------------- Flow diagram -------------------------------- */
.flow-diagram { display: grid; gap: .8rem; justify-items: center; text-align: center; }
.flow-node { width: 100%; border-radius: var(--radius); padding: 1.1rem 1.3rem; border: 1px solid rgba(255, 255, 255, .16); }
.flow-node strong { display: block; font-size: 1.1rem; color: #fff; }
.flow-node span { font-size: .88rem; color: #b7b7c0; }
.flow-node.owner { background: rgba(255, 106, 26, .16); border-color: rgba(255, 106, 26, .4); }
.flow-node.owner strong { color: var(--orange); }
.flow-node.result { background: rgba(212, 248, 41, .12); border-color: rgba(212, 248, 41, .3); }
.flow-node.result strong { color: var(--lime); }
.flow-arrow { color: rgba(255, 255, 255, .4); font-size: 1.4rem; line-height: 1; }
.flow-row { display: flex; flex-wrap: wrap; gap: .55rem; justify-content: center; }
.flow-chip { background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .14); border-radius: 999px; padding: .5rem .95rem; font-size: .88rem; font-weight: 600; color: #e6e6ea; }

/* --------------------------- Compare table ----------------------------- */
.compare-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--line); background: #fff; }
.compare { width: 100%; border-collapse: collapse; min-width: 520px; }
.compare th, .compare td { text-align: left; padding: 1rem 1.2rem; border-bottom: 1px solid var(--line); font-size: .98rem; vertical-align: top; }
.compare thead th { background: var(--ink); color: #fff; font-size: .82rem; text-transform: uppercase; letter-spacing: .08em; }
.compare thead th:last-child { color: var(--lime); }
.compare tbody tr:last-child td { border-bottom: 0; }
.compare tbody tr:nth-child(even) { background: var(--paper); }
.compare td:last-child { font-weight: 600; }
.compare a { color: var(--orange-deep); font-weight: 700; }
.compare a:hover { text-decoration: underline; }

/* ------------------------- Persona (for/not-for) ----------------------- */
.forlist { display: grid; gap: .6rem; }
.forlist li { position: relative; padding-left: 2rem; color: var(--ink-soft); }
.forlist.yes li::before { content: "✓"; position: absolute; left: 0; color: var(--lime-deep); font-weight: 800; }
.forlist.no li::before { content: "✕"; position: absolute; left: 0; color: #c94b2b; font-weight: 800; }

/* ----------------------- Learning path (bậc) --------------------------- */
.path { display: grid; gap: 1.4rem; position: relative; }
.path-level { display: grid; grid-template-columns: auto 1fr; gap: clamp(1rem, .5rem + 2vw, 2rem); align-items: start; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: clamp(1.4rem, 1rem + 1.6vw, 2.2rem); }
.path-badge { font-weight: 800; font-size: .82rem; letter-spacing: .06em; text-transform: uppercase; color: #fff; background: var(--orange); padding: .6rem .9rem; border-radius: 12px; white-space: nowrap; }
.path-badge.lime { background: var(--lime); color: var(--ink); }
.path-badge.dark { background: var(--ink); color: var(--lime); }
.path-body h2 { font-size: var(--h3); }
@media (max-width: 640px) { .path-level { grid-template-columns: 1fr; } }

/* ----------------------------- Blog list ------------------------------- */
.post-list { display: grid; gap: 1.2rem; }
.post-item { display: grid; grid-template-columns: 1fr auto; gap: 1.4rem; align-items: center; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(1.2rem, 1rem + 1vw, 1.7rem); transition: transform .2s var(--ease), box-shadow .2s var(--ease); }
.post-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); }
.post-item .post-meta { display: flex; gap: .6rem; align-items: center; font-size: .78rem; color: var(--muted); margin-bottom: .5rem; }
.post-item h3 { font-size: 1.3rem; }
.post-item p { font-size: .96rem; margin-top: .4rem; max-width: 62ch; }
.post-arrow { width: 48px; height: 48px; border-radius: 50%; background: var(--orange-soft); color: var(--orange-deep); display: grid; place-items: center; flex: none; }
.post-arrow svg { width: 22px; height: 22px; }
@media (max-width: 560px) { .post-item { grid-template-columns: 1fr; } .post-arrow { display: none; } }

/* --------------------------- Article layout ---------------------------- */
.article-head { max-width: 760px; margin-inline: auto; }
.article-body { max-width: 720px; margin-inline: auto; }
.article-body img { border-radius: var(--radius); }
.article-meta { display: flex; flex-wrap: wrap; gap: .8rem; align-items: center; color: var(--muted); font-size: .9rem; margin-top: 1.2rem; }
.article-meta .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--muted); }
.share-row { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.related-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 560px) { .related-nav { grid-template-columns: 1fr; } }

/* ------------------------------ Contact -------------------------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 1rem + 4vw, 4rem); align-items: start; }
@media (max-width: 820px) { .contact-grid { grid-template-columns: 1fr; } }
.field { display: block; margin-bottom: 1.1rem; }
.field label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: .4rem; color: var(--ink); }
.field input, .field textarea, .field select {
  width: 100%; padding: .85rem 1rem; border: 1px solid var(--line-strong); border-radius: 12px;
  background: #fff; font-size: 1rem; transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field textarea:focus, .field select:focus { outline: 0; border-color: var(--orange); box-shadow: 0 0 0 3px rgba(255, 106, 26, .16); }
.field textarea { min-height: 130px; resize: vertical; }
.form-note { background: var(--lime-soft); border: 1px solid #e3f39a; border-radius: 12px; padding: .9rem 1.1rem; font-size: .92rem; color: #4f5b00; margin-top: 1rem; }
.contact-cards { display: grid; gap: 1rem; }
.contact-card { display: flex; gap: 1rem; align-items: flex-start; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem 1.3rem; }
.contact-card .ico { width: 46px; height: 46px; flex: none; border-radius: 12px; background: var(--orange-soft); color: var(--orange-deep); display: grid; place-items: center; font-size: 1.3rem; }
.contact-card h3 { font-size: 1.05rem; margin-bottom: .15rem; }
.contact-card a { color: var(--orange-deep); font-weight: 600; word-break: break-word; }
.contact-card p { font-size: .92rem; }