@font-face { font-family: "Be Vietnam Pro"; font-style: normal; font-weight: 400; font-display: swap; src: url("assets/be-vietnam-pro-400-vi.woff2") format("woff2"); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; }
@font-face { font-family: "Be Vietnam Pro"; font-style: normal; font-weight: 400; font-display: swap; src: url("assets/be-vietnam-pro-400-latin.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Be Vietnam Pro"; font-style: normal; font-weight: 500 700; font-display: swap; src: url("assets/be-vietnam-pro-600-vi.woff2") format("woff2"); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; }
@font-face { font-family: "Be Vietnam Pro"; font-style: normal; font-weight: 500 700; font-display: swap; src: url("assets/be-vietnam-pro-600-latin.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Cormorant Garamond"; font-style: normal; font-weight: 600; font-display: swap; src: url("assets/cormorant-garamond-display-vi.woff2") format("woff2"); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; }
@font-face { font-family: "Cormorant Garamond"; font-style: normal; font-weight: 600; font-display: swap; src: url("assets/cormorant-garamond-display-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; }

:root {
  --ink: #151816;
  --ink-2: #252a27;
  --paper: #f4f1ea;
  --paper-2: #eae6dc;
  --white: #fffefa;
  --muted: #656b67;
  --line: rgba(21, 24, 22, 0.14);
  --lime: #c9f24a;
  --green: #1d694d;
  --blue: #2863d7;
  --orange: #d86138;
  --font-body: "Be Vietnam Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Cormorant Garamond", Georgia, serif;
  --shadow: 0 16px 48px rgba(21, 24, 22, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
}
body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: linear-gradient(rgba(21,24,22,.025) 1px, transparent 1px), linear-gradient(90deg, rgba(21,24,22,.025) 1px, transparent 1px);
  background-size: 48px 48px;
  content: "";
  pointer-events: none;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 10px 14px;
  background: var(--white);
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 12px max(24px, calc((100% - 1280px) / 2));
  border-bottom: 1px solid rgba(255,255,255,.08);
  background: rgba(21, 24, 22, .93);
  color: var(--white);
  backdrop-filter: blur(16px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; line-height: 1.1; }
.brand-mark { display: grid; width: 38px; height: 38px; place-items: center; background: var(--lime); color: var(--ink); border-radius: 4px; font-family: var(--font-display); font-size: 24px; font-weight: 400; }
.brand small { display: block; margin-top: 4px; color: #aeb6b0; font-size: 10px; font-weight: 500; text-transform: uppercase; }
.site-header nav { display: flex; gap: 28px; }
.site-header nav a { color: #c8cec9; font-size: 13px; text-decoration: none; }
.site-header nav a:hover { color: var(--white); }
.header-cta { min-height: 44px; padding: 10px 16px; border: 1px solid rgba(255,255,255,.26); border-radius: 4px; text-decoration: none; font-size: 13px; font-weight: 600; }
.header-cta span { margin-left: 8px; color: var(--lime); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(560px, 1.1fr);
  gap: 56px;
  align-items: center;
  min-height: 720px;
  padding: 80px max(24px, calc((100% - 1280px) / 2)) 96px;
  background: var(--ink);
  color: var(--white);
  overflow: hidden;
}
.hero-copy { max-width: 620px; }
.eyebrow { margin: 0 0 20px; color: var(--green); font-size: 12px; font-weight: 700; text-transform: uppercase; }
.hero .eyebrow, .walkthrough .eyebrow, .lessons .eyebrow, .register .eyebrow { color: var(--lime); }
.hero .eyebrow span { display: inline-block; width: 8px; height: 8px; margin-right: 8px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 6px rgba(201,242,74,.12); }
h1, h2, h3, p { text-wrap: pretty; }
h1, h2 { text-wrap: balance; }
h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 68px;
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: 0;
}
h1 em { color: var(--lime); font-weight: 400; }
.hero-lead { max-width: 590px; margin: 28px 0 0; color: #c4cbc5; font-size: 18px; line-height: 1.7; }
.hero-offer { display: flex; gap: 12px; margin: 28px 0 0; }
.hero-offer span { padding: 10px 14px; border: 1px solid rgba(255,255,255,.15); border-radius: 4px; color: #aeb7b0; font-size: 13px; }
.hero-offer strong { color: var(--white); font-size: 15px; }
.hero-actions { display: flex; gap: 12px; margin-top: 24px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 12px 20px; border: 1px solid transparent; border-radius: 4px; text-decoration: none; font-size: 14px; font-weight: 700; cursor: pointer; transition: transform .2s ease, background .2s ease, border-color .2s ease; }
.button:hover { transform: translateY(-2px); }
.button span { margin-left: 12px; }
.button-primary { background: var(--lime); color: var(--ink); }
.button-primary:hover { background: #d7ff62; }
.button-secondary { border-color: rgba(255,255,255,.24); background: transparent; color: var(--white); }
.button-secondary:hover { border-color: var(--white); }
.button.full { width: 100%; }
.trust-line { margin: 20px 0 0; color: #919b94; font-size: 12px; }

.hero-demo { position: relative; min-width: 0; border: 1px solid rgba(255,255,255,.14); border-radius: 8px; background: #202522; box-shadow: 0 36px 90px rgba(0,0,0,.42); overflow: hidden; }
.hero-demo::before { position: absolute; inset: -30% 20% auto; height: 240px; background: rgba(201,242,74,.1); filter: blur(90px); content: ""; pointer-events: none; }
.demo-topbar { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; min-height: 48px; padding: 0 16px; border-bottom: 1px solid rgba(255,255,255,.09); color: #9ca59f; font-size: 11px; }
.window-dots { display: flex; gap: 5px; }
.window-dots i { width: 7px; height: 7px; border-radius: 50%; background: #5d665f; }
.window-dots i:first-child { background: var(--orange); }
.window-dots i:nth-child(2) { background: #d4a23c; }
.window-dots i:last-child { background: var(--green); }
.secure-label { color: var(--lime); }
.demo-workspace { display: grid; grid-template-columns: 150px minmax(0, 1fr); min-height: 480px; }
.file-rail { padding: 16px 10px; border-right: 1px solid rgba(255,255,255,.08); background: rgba(0,0,0,.12); }
.file-item { display: flex; gap: 9px; align-items: center; padding: 10px 8px; border-radius: 4px; color: #aab2ac; }
.file-item + .file-item { margin-top: 6px; }
.file-item.active { background: rgba(201,242,74,.1); color: var(--white); }
.file-item b { display: grid; flex: 0 0 27px; width: 27px; height: 27px; place-items: center; border: 1px solid rgba(255,255,255,.13); border-radius: 3px; color: #91b7ff; font-size: 11px; }
.file-item:nth-child(2) b { color: #86d3aa; }
.file-item:nth-child(3) b { color: #edb36d; }
.file-item span { min-width: 0; font-size: 10px; font-weight: 600; }
.file-item small { display: block; margin-top: 2px; color: #727b75; font-size: 8px; }
.document-scene { display: flex; min-width: 0; flex-direction: column; background: #333935; }
.doc-toolbar { display: flex; justify-content: space-between; gap: 12px; min-height: 42px; padding: 12px 16px; border-bottom: 1px solid rgba(255,255,255,.07); color: #aeb6b0; font-size: 10px; }
.doc-toolbar b { color: var(--lime); font-weight: 500; }
.paper { width: min(88%, 390px); min-height: 350px; margin: 20px auto 16px; padding: 28px 32px; background: #fff; color: #262a27; box-shadow: 0 16px 40px rgba(0,0,0,.24); }
.paper p { margin: 0; }
.paper-country { text-align: center; font-family: Georgia, serif; font-size: 8px; font-weight: 700; }
.paper-motto { margin-top: 2px !important; text-align: center; font-family: Georgia, serif; font-size: 7px; text-decoration: underline; }
.paper h2 { margin: 24px 0 22px; font-family: Georgia, serif; font-size: 15px; text-align: center; }
.paper-field { display: grid; grid-template-columns: 74px 1fr; gap: 8px; padding: 8px 0; border-bottom: 1px solid #e2e4e2; font-size: 8px; }
.paper-field span { color: #747975; }
.paper-field strong { position: relative; font-weight: 600; }
.paper-field strong::after { position: absolute; right: 0; bottom: -5px; left: 0; height: 2px; background: var(--lime); transform: scaleX(0); transform-origin: left; content: ""; }
.hero-demo.demo-running .paper-field strong::after { animation: fieldScan 3.8s ease infinite; }
.hero-demo.demo-running .paper-field:nth-child(5) strong::after { animation-delay: .35s; }
.hero-demo.demo-running .paper-field:nth-child(6) strong::after { animation-delay: .7s; }
.hero-demo.demo-running .paper-field:nth-child(7) strong::after { animation-delay: 1.05s; }
.paper-signatures { display: flex; justify-content: space-between; margin-top: 24px; font-family: Georgia, serif; font-size: 7px; font-weight: 700; }
.review-bar { display: flex; justify-content: space-between; gap: 12px; padding: 10px 16px; background: #272c29; color: #aeb6b0; font-size: 9px; }
.review-bar span { display: flex; align-items: center; gap: 6px; }
.review-bar i { width: 6px; height: 6px; border-radius: 50%; background: var(--lime); }
.review-bar strong { color: #f6c487; font-weight: 500; }
@keyframes fieldScan { 0%, 15% { transform: scaleX(0); } 40%, 75% { transform: scaleX(1); } 90%, 100% { transform: scaleX(0); transform-origin: right; } }

.proof-strip { display: grid; grid-template-columns: repeat(4, 1fr); max-width: 1280px; margin: -36px auto 0; position: relative; z-index: 2; background: var(--white); border: 1px solid var(--line); border-radius: 6px; box-shadow: var(--shadow); }
.proof-strip div { display: flex; align-items: center; gap: 12px; min-height: 96px; padding: 20px 24px; }
.proof-strip div + div { border-left: 1px solid var(--line); }
.proof-strip strong { font-family: var(--font-display); font-size: 26px; font-weight: 400; }
.proof-strip span { color: var(--muted); font-size: 12px; line-height: 1.45; }

.section { padding: 120px max(24px, calc((100% - 1180px) / 2)); }
.section-heading { max-width: 770px; margin-bottom: 48px; }
.section-heading.compact { max-width: 860px; }
.section-heading h2, .legal h2, .boundary h2, .instructor h2, .offer h2, .register h2 { margin: 0; font-family: var(--font-display); font-size: 52px; font-weight: 400; line-height: 1.08; }
.section-heading > p:last-child, .legal-copy > p, .offer-copy > p, .register-copy > p { margin: 22px 0 0; color: var(--muted); font-size: 17px; }
.section-heading.light h2 { color: var(--white); }
.section-heading.light > p:last-child { color: #aeb8b1; }

.pain-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.pain-grid article { min-height: 250px; padding: 28px; border: 1px solid var(--line); border-radius: 6px; background: rgba(255,254,250,.56); }
.pain-grid article:nth-child(2) { background: var(--ink); color: var(--white); }
.pain-grid span { color: var(--orange); font-size: 11px; font-weight: 700; }
.pain-grid h3 { margin: 66px 0 12px; font-family: var(--font-display); font-size: 26px; font-weight: 400; line-height: 1.15; }
.pain-grid p { margin: 0; color: var(--muted); font-size: 13px; }
.pain-grid article:nth-child(2) p { color: #aeb6b0; }

.walkthrough { background: var(--ink); color: var(--white); }
.walkthrough-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 56px; align-items: start; }
.work-steps { margin: 0; padding: 0; list-style: none; }
.work-steps li { display: flex; gap: 18px; padding: 18px 0; border-bottom: 1px solid rgba(255,255,255,.1); color: #7f8982; cursor: pointer; }
.work-steps li:first-child { border-top: 1px solid rgba(255,255,255,.1); }
.work-steps li.active { color: var(--white); }
.work-steps b { color: var(--lime); font-size: 11px; }
.work-steps span { display: block; }
.work-steps strong { display: block; font-size: 15px; }
.work-steps small { display: block; margin-top: 5px; color: #8e9891; font-size: 11px; line-height: 1.55; }
.work-output { min-height: 430px; padding: 24px; border: 1px solid rgba(255,255,255,.13); border-radius: 8px; background: #242925; box-shadow: 0 22px 60px rgba(0,0,0,.28); }
.output-head { display: flex; justify-content: space-between; gap: 16px; padding-bottom: 18px; border-bottom: 1px solid rgba(255,255,255,.1); }
.output-head span { color: var(--lime); font-size: 10px; font-weight: 700; }
.output-head b { font-size: 13px; }
.output-body { display: grid; gap: 12px; min-height: 270px; align-content: center; padding: 28px 4%; }
.input-file { display: grid; grid-template-columns: 38px 1fr auto; gap: 14px; align-items: center; padding: 14px; border: 1px solid rgba(255,255,255,.11); border-radius: 4px; background: rgba(0,0,0,.12); }
.input-file i { display: grid; width: 38px; height: 38px; place-items: center; border-radius: 3px; background: #2f5fab; font-style: normal; font-weight: 700; }
.input-file:nth-child(2) i { background: #27764e; }
.input-file:nth-child(3) i { background: #a55f2b; }
.input-file span { font-size: 12px; font-weight: 600; }
.input-file small { display: block; color: #8f9992; font-size: 9px; font-weight: 400; }
.input-file b { color: #7f8982; font-size: 9px; }
.work-output > p { margin: 0; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.1); color: #9ea7a1; font-size: 11px; }
.output-placeholder { display: grid; min-height: 270px; place-items: center; text-align: center; }
.output-placeholder i { display: grid; width: 64px; height: 64px; margin: 0 auto 18px; place-items: center; border: 1px solid rgba(201,242,74,.5); border-radius: 50%; color: var(--lime); font-style: normal; font-size: 22px; }
.output-placeholder strong { display: block; font-family: var(--font-display); font-size: 25px; font-weight: 400; }
.output-placeholder small { display: block; max-width: 340px; margin-top: 8px; color: #9aa49d; font-size: 11px; }

.evidence-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.case-card { min-height: 460px; padding: 36px; border: 1px solid var(--line); border-radius: 8px; background: var(--white); position: relative; overflow: hidden; }
.case-card::after { position: absolute; right: -45px; bottom: -45px; width: 180px; height: 180px; border: 1px solid var(--line); border-radius: 50%; content: ""; }
.case-994 { background: var(--ink); color: var(--white); }
.case-label { color: var(--muted); font-size: 11px; font-weight: 700; text-transform: uppercase; }
.case-994 .case-label { color: #aab4ad; }
.case-label span { display: inline-grid; width: 28px; height: 28px; margin-right: 8px; place-items: center; border-radius: 50%; background: var(--lime); color: var(--ink); }
.case-card h3 { max-width: 500px; margin: 60px 0 16px; font-family: var(--font-display); font-size: 34px; font-weight: 400; line-height: 1.12; }
.case-card > p { max-width: 510px; margin: 0; color: var(--muted); font-size: 14px; }
.case-994 > p { color: #aeb6b0; }
.case-card ul { position: relative; z-index: 1; margin: 28px 0 0; padding: 0; list-style: none; }
.case-card li { padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 12px; }
.case-994 li { border-color: rgba(255,255,255,.1); color: #d5dad6; }
.privacy-note { margin: 20px 0 0; padding: 18px 20px; border-left: 3px solid var(--green); background: rgba(29,105,77,.08); color: var(--muted); font-size: 12px; }
.privacy-note strong { color: var(--ink); }

.document-types { background: var(--paper-2); }
.document-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.document-grid article { min-height: 230px; padding: 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.document-grid span { color: var(--orange); font-size: 10px; font-weight: 700; }
.document-grid h3 { margin: 48px 0 10px; font-family: var(--font-display); font-size: 25px; font-weight: 400; }
.document-grid p { margin: 0; color: var(--muted); font-size: 13px; }

.legal { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; background: var(--white); }
.legal-copy > p { max-width: 590px; }
.legal-warning { display: grid; gap: 5px; margin-top: 30px; padding: 18px; border: 1px solid rgba(216,97,56,.28); border-radius: 4px; background: rgba(216,97,56,.06); }
.legal-warning strong { font-size: 13px; }
.legal-warning span { color: var(--muted); font-size: 11px; }
.legal-stack { align-self: center; }
.legal-stack article { display: grid; grid-template-columns: 38px 1fr; gap: 16px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.legal-stack article:first-child { border-top: 1px solid var(--line); }
.legal-stack b { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 50%; background: var(--ink); color: var(--white); font-size: 10px; }
.legal-stack strong, .legal-stack small { display: block; }
.legal-stack strong { font-size: 14px; }
.legal-stack small { margin-top: 5px; color: var(--muted); font-size: 11px; line-height: 1.55; }
.legal-stack > p { margin: 18px 0 0; color: var(--muted); font-size: 10px; }

.lessons { background: var(--ink); color: var(--white); }
.lesson-list { border-top: 1px solid rgba(255,255,255,.12); }
.lesson-list article { display: grid; grid-template-columns: 90px 1fr 230px; gap: 28px; align-items: center; min-height: 170px; border-bottom: 1px solid rgba(255,255,255,.12); }
.lesson-number { font-family: var(--font-display); color: var(--lime); font-size: 34px; }
.lesson-list p { margin: 0 0 5px; color: #818c84; font-size: 10px; text-transform: uppercase; }
.lesson-list h3 { margin: 0; font-family: var(--font-display); font-size: 27px; font-weight: 400; }
.lesson-list span { display: block; max-width: 650px; margin-top: 8px; color: #aeb7b0; font-size: 12px; }
.lesson-list > article > strong { color: #d6dcce; font-size: 11px; font-weight: 500; }

.boundary { padding-bottom: 64px; }
.boundary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; }
.boundary-grid ul { margin: 0; padding: 0; list-style: none; }
.boundary-grid li { display: flex; gap: 12px; padding: 15px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.boundary-grid li:first-child { border-top: 1px solid var(--line); }
.boundary-grid li span { color: var(--green); font-weight: 700; }
.boundary-note { margin: 56px 0 0; padding: 22px 24px; background: var(--ink); color: #aeb6b0; font-size: 12px; }
.boundary-note strong { color: var(--white); }

.instructor {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  gap: 72px;
  align-items: center;
  padding-top: 64px;
}
.portrait-wrap {
  position: relative;
  min-width: 0;
  width: 100%;
  max-width: min(100%, 480px);
  /* Chi chieu cao theo ty le 4:5 tu chieu rong — khong de img height=900 day khung. */
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: 6px;
  background: #d9d5cc;
}
.portrait-wrap img {
  position: absolute;
  inset: 0;
  display: block;
  width: 100% !important;
  height: 100% !important;
  max-width: none;
  max-height: none;
  object-fit: cover;
  object-position: center 18%;
  border-radius: 6px;
  filter: saturate(.85) contrast(1.03);
}
.portrait-wrap span {
  position: absolute;
  z-index: 1;
  right: 12px;
  bottom: 12px;
  padding: 8px 10px;
  background: var(--lime);
  color: var(--ink);
  font-size: 10px;
  font-weight: 700;
}
.instructor-copy > p { max-width: 620px; margin: 24px 0 0; color: var(--muted); font-size: 15px; }
.instructor-copy ul { margin: 28px 0 0; padding: 0; list-style: none; }
.instructor-copy li { padding: 10px 0 10px 22px; border-bottom: 1px solid var(--line); font-size: 12px; position: relative; }
.instructor-copy li::before { position: absolute; left: 0; color: var(--green); content: "✓"; }
.instructor-copy blockquote { margin: 32px 0 0; padding: 22px 0 0; border-top: 1px solid var(--line); font-family: var(--font-display); font-size: 23px; line-height: 1.35; }

.offer { display: grid; grid-template-columns: 1fr 520px; gap: 72px; align-items: center; background: var(--paper-2); }
.offer-copy { max-width: 560px; }
.text-link { display: inline-flex; margin-top: 24px; color: var(--green); font-size: 13px; font-weight: 700; text-decoration: none; }
.text-link span { margin-left: 10px; }
.price-card { padding: 34px; border: 1px solid var(--line); border-radius: 8px; background: var(--white); box-shadow: var(--shadow); }
.price-head { padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.price-head span, .price-head strong, .price-head small { display: block; }
.price-head span { color: var(--muted); font-size: 11px; text-transform: uppercase; }
.price-head strong { margin-top: 8px; font-family: var(--font-display); font-size: 50px; font-weight: 400; line-height: 1; }
.price-head small { margin-top: 10px; color: var(--muted); font-size: 10px; }
.price-card ul { margin: 22px 0; padding: 0; list-style: none; }
.price-card li { display: flex; gap: 10px; padding: 8px 0; font-size: 12px; }
.price-card li span { color: var(--green); font-weight: 700; }
.price-card > p { margin: 14px 0 0; color: var(--muted); font-size: 9px; text-align: center; }

.faq-list { max-width: 900px; }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list details:first-child { border-top: 1px solid var(--line); }
.faq-list summary { display: flex; justify-content: space-between; gap: 18px; align-items: center; min-height: 70px; padding: 16px 0; font-weight: 600; list-style: none; cursor: pointer; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { font-size: 22px; font-weight: 400; transition: transform .2s ease; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details p { max-width: 720px; margin: 0 0 24px; color: var(--muted); font-size: 13px; }

/* Cross-course upsell: AULISP full + AutoLISP (khong tron checkout Word) */
.cross-upsell {
  padding: 96px max(24px, calc((100% - 1180px) / 2));
  border-top: 1px solid var(--line);
  background:
    linear-gradient(180deg, #efebe2 0%, var(--paper) 40%, #e8e4da 100%);
}
.cross-upsell-intro {
  max-width: 720px;
  margin: 0 0 40px;
}
.cross-upsell-intro h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 4vw, 48px);
  font-weight: 400;
  line-height: 1.12;
}
.cross-upsell-intro > p:last-child {
  margin: 16px 0 0;
  max-width: 620px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.65;
}
.cross-upsell-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 18px;
  align-items: stretch;
}
.cross-card {
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 100%;
  overflow: hidden;
  border-radius: 10px;
  box-shadow: 0 18px 48px rgba(21, 24, 22, .1);
}
.cross-card-top { padding: 28px 26px 18px; }
.cross-card-offer {
  display: grid;
  gap: 4px;
  padding: 22px 26px 26px;
  border-top: 1px solid rgba(255, 255, 255, .1);
}
.cross-badge {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 14px;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .03em;
  text-transform: uppercase;
}
.cross-kicker {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.cross-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 3vw, 34px);
  font-weight: 400;
  line-height: 1.15;
}
.cross-card-top > p:not(.cross-kicker) {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.6;
}
.cross-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}
.cross-tags li {
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.cross-card-offer > span {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.cross-card-offer > strong {
  font-size: 36px;
  line-height: 1.1;
  letter-spacing: -.02em;
}
.cross-card-offer > small {
  color: inherit;
  font-size: 13px;
  opacity: .78;
}
.cross-card-offer .button {
  margin-top: 14px;
  justify-content: space-between;
}
.cross-card-offer .button b { font-size: 15px; }
.cross-note {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.55;
  opacity: .82;
}

/* Full AULISP: dark premium + lime */
.cross-card-full {
  color: #f3f5f2;
  background:
    radial-gradient(ellipse 80% 70% at 100% 0%, rgba(201, 242, 74, .12), transparent 55%),
    linear-gradient(145deg, #151816 0%, #1c221e 55%, #141814 100%);
  border: 1px solid rgba(201, 242, 74, .18);
}
.cross-badge-full {
  border: 1px solid rgba(201, 242, 74, .35);
  background: rgba(201, 242, 74, .12);
  color: #d7ff7a;
}
.cross-card-full .cross-kicker { color: #c9f24a; }
.cross-card-full .cross-card-top > p:not(.cross-kicker) { color: #b8c0b6; }
.cross-card-full .cross-tags li {
  border: 1px solid rgba(201, 242, 74, .22);
  background: rgba(255, 255, 255, .04);
  color: #dce4d6;
}
.cross-card-full .cross-card-offer {
  background: rgba(0, 0, 0, .22);
  border-top-color: rgba(201, 242, 74, .14);
}
.cross-card-full .cross-card-offer > span { color: #9ca49a; }
.cross-card-full .cross-card-offer > strong { color: #f7faf3; }
.cross-card-full .button-primary {
  background: var(--lime);
  color: var(--ink);
  border-color: transparent;
}
.cross-card-full .button-primary:hover { background: #d8ff6a; color: var(--ink); }
.cross-card-full .cross-note { color: #a8b0a6; }

/* AutoLISP: CAD teal + blue accent (khac Word paper + full lime) */
.cross-card-lisp {
  color: #eef6f8;
  background:
    radial-gradient(ellipse 70% 60% at 0% 100%, rgba(40, 160, 200, .16), transparent 50%),
    linear-gradient(155deg, #0e171b 0%, #122025 50%, #0f1a1e 100%);
  border: 1px solid rgba(90, 180, 210, .28);
}
.cross-badge-lisp {
  border: 1px solid rgba(120, 200, 230, .35);
  background: rgba(60, 140, 180, .16);
  color: #9fdcf0;
}
.cross-card-lisp .cross-kicker { color: #7ec8e0; }
.cross-card-lisp .cross-card-top > p:not(.cross-kicker) { color: #b0c5cd; }
.cross-card-lisp .cross-tags li {
  border: 1px solid rgba(100, 180, 200, .28);
  background: rgba(40, 90, 110, .28);
  color: #d0e8f0;
}
.cross-card-lisp .cross-card-offer {
  background: rgba(0, 20, 28, .35);
  border-top-color: rgba(90, 180, 210, .18);
}
.cross-card-lisp .cross-card-offer > span { color: #8eacb8; }
.cross-card-lisp .cross-card-offer > strong { color: #f2fafc; }
.cross-card-lisp .button-primary {
  background: linear-gradient(180deg, #3d9fd4, #2b7fb0);
  color: #ffffff;
  border-color: transparent;
}
.cross-card-lisp .button-primary:hover {
  background: linear-gradient(180deg, #4eb0e4, #348fc4);
  color: #ffffff;
}
.cross-card-lisp .cross-note { color: #9db8c2; }

.register { display: grid; grid-template-columns: 1fr 520px; gap: 72px; padding: 112px max(24px, calc((100% - 1180px) / 2)) calc(112px + env(safe-area-inset-bottom)); background: var(--ink); color: var(--white); }
.register-copy { align-self: center; }
.register-copy > p { color: #aeb6b0; }
.contact-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 32px; }
.contact-cards a { display: grid; grid-template-columns: 1fr auto; padding: 16px; border: 1px solid rgba(255,255,255,.14); border-radius: 4px; text-decoration: none; }
.contact-cards span, .contact-cards strong { display: block; grid-column: 1; }
.contact-cards span { color: #8f9992; font-size: 9px; text-transform: uppercase; }
.contact-cards strong { margin-top: 4px; font-size: 12px; }
.contact-cards i { grid-column: 2; grid-row: 1 / 3; align-self: center; color: var(--lime); font-style: normal; }
.form-shell { min-height: 560px; padding: 32px; border-radius: 8px; background: var(--white); color: var(--ink); }
.form-title { display: flex; justify-content: space-between; align-items: center; margin-bottom: 22px; }
.form-title span { font-family: var(--font-display); font-size: 25px; }
.form-title b { padding: 6px 9px; border-radius: 3px; background: var(--ink); color: var(--lime); font-size: 10px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-shell label { display: block; margin-bottom: 14px; color: #4d534f; font-size: 10px; font-weight: 600; }
.form-shell label small { color: #858c87; font-weight: 400; }
.form-shell input, .form-shell select, .form-shell textarea { width: 100%; min-height: 46px; margin-top: 6px; padding: 11px 12px; border: 1px solid #cdd1ce; border-radius: 4px; background: #fff; color: var(--ink); font-size: 13px; outline: none; }
.form-shell textarea { min-height: 88px; resize: vertical; }
.form-shell input:focus, .form-shell select:focus, .form-shell textarea:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(29,105,77,.1); }
.form-shell .check { display: flex; gap: 10px; align-items: flex-start; margin: 16px 0; font-size: 10px; line-height: 1.5; }
.form-shell .check input { flex: 0 0 18px; width: 18px; min-height: 18px; margin: 0; }
.form-status { margin: 12px 0 0; color: var(--muted); font-size: 9px; text-align: center; }
.form-status.error { color: #a63228; }
.honeypot { position: absolute !important; left: -9999px !important; width: 1px !important; height: 1px !important; opacity: 0 !important; }
.success-panel { display: grid; min-height: 480px; align-content: center; text-align: center; }
.success-mark { display: grid; width: 64px; height: 64px; margin: 0 auto 20px; place-items: center; border-radius: 50%; background: var(--green); color: var(--white); font-size: 28px; }
.success-panel h3 { margin: 0; font-family: var(--font-display); font-size: 32px; font-weight: 400; }
.success-panel p { color: var(--muted); font-size: 13px; }
.success-panel > strong { margin: 0 0 22px; color: var(--green); font-size: 12px; }

.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 110px; padding: 24px max(24px, calc((100% - 1180px) / 2)); background: #101210; color: var(--white); }
.site-footer p { color: #7d867f; font-size: 10px; }
.site-footer nav { display: flex; gap: 18px; }
.site-footer nav a, .site-footer nav button { padding: 0; border: 0; background: none; color: #9da69f; font-size: 10px; text-decoration: none; cursor: pointer; }
.mobile-cta { display: none; }

.cookie-banner { position: fixed; right: 20px; bottom: 20px; z-index: 100; width: min(420px, calc(100% - 40px)); padding: 16px; border: 1px solid var(--line); border-radius: 6px; background: var(--white); box-shadow: var(--shadow); }
.cookie-banner p { margin: 0; color: var(--muted); font-size: 10px; }
.cookie-banner div { display: flex; justify-content: flex-end; gap: 8px; margin-top: 12px; }
.cookie-banner button { min-height: 40px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 4px; background: transparent; font-size: 10px; cursor: pointer; }
.cookie-banner button:last-child { background: var(--ink); color: var(--white); }

.legal-page { background: var(--white); }
.policy-content { max-width: 820px; min-height: calc(100vh - 72px); padding: 88px 24px 120px; margin: 0 auto; }
.policy-content h1 { color: var(--ink); font-size: 56px; }
.policy-content h2 { margin: 48px 0 12px; font-family: var(--font-display); font-size: 28px; font-weight: 400; }
.policy-content p { color: var(--muted); }
.policy-content .button { margin-top: 36px; }

@media (max-width: 1100px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 72px; }
  .hero-copy { max-width: 800px; }
  .hero-demo { width: min(800px, 100%); }
  .proof-strip { width: calc(100% - 48px); }
  .proof-strip div { padding: 18px; }
  .pain-grid { grid-template-columns: 1fr 1fr; }
  .walkthrough-grid, .legal, .boundary-grid, .instructor, .offer, .register { gap: 44px; }
  .offer, .register { grid-template-columns: 1fr 460px; }
  .cross-upsell-grid { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  .site-header { min-height: 64px; }
  .site-header nav, .header-cta { display: none; }
  h1 { font-size: 56px; }
  .section-heading h2, .legal h2, .boundary h2, .instructor h2, .offer h2, .register h2 { font-size: 43px; }
  .proof-strip { grid-template-columns: 1fr 1fr; margin-top: -24px; }
  .proof-strip div:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .proof-strip div:nth-child(4) { border-top: 1px solid var(--line); }
  .section { padding-top: 88px; padding-bottom: 88px; }
  .walkthrough-grid, .legal, .boundary-grid, .instructor, .offer, .register { grid-template-columns: 1fr; }
  .work-steps { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .work-steps li, .work-steps li:first-child { min-height: 120px; padding: 14px; border: 1px solid rgba(255,255,255,.1); border-radius: 4px; }
  .evidence-grid { grid-template-columns: 1fr; }
  .document-grid { grid-template-columns: 1fr 1fr; }
  .lesson-list article { grid-template-columns: 68px 1fr; padding: 28px 0; }
  .lesson-list > article > strong { grid-column: 2; }
  .instructor { padding-top: 88px; }
  .portrait-wrap { max-width: min(100%, 420px); width: 100%; margin: 0 auto; }
  .offer-copy { max-width: 700px; }
  .price-card, .form-shell { width: min(560px, 100%); }
  .register { padding-top: 88px; padding-bottom: calc(136px + env(safe-area-inset-bottom)); }
  .site-footer { padding-bottom: calc(96px + env(safe-area-inset-bottom)); }
  .mobile-cta { position: fixed; right: 0; bottom: 0; left: 0; z-index: 90; display: grid; grid-template-columns: 72px 72px 1fr; gap: 1px; padding: 8px max(10px, env(safe-area-inset-right)) calc(8px + env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left)); background: rgba(21,24,22,.96); backdrop-filter: blur(14px); }
  .mobile-cta a { display: grid; min-height: 48px; place-items: center; border: 1px solid rgba(255,255,255,.14); border-radius: 4px; color: var(--white); font-size: 11px; font-weight: 600; text-decoration: none; }
  .mobile-cta a:last-child { background: var(--lime); color: var(--ink); }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .site-header { padding-right: 16px; padding-left: 16px; }
  .brand-mark { width: 34px; height: 34px; font-size: 21px; }
  .brand { font-size: 13px; }
  .hero { gap: 44px; padding: 56px 16px 72px; }
  h1 { font-size: 43px; line-height: 1.05; }
  .hero-lead { margin-top: 22px; font-size: 16px; line-height: 1.65; }
  .hero-offer { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .hero-offer span { padding: 9px; font-size: 10px; }
  .hero-offer strong { display: block; font-size: 13px; }
  .hero-actions { display: grid; }
  .button { min-height: 48px; }
  .trust-line { line-height: 1.6; }
  .demo-topbar { padding: 0 10px; }
  .secure-label { display: none; }
  .demo-workspace { grid-template-columns: 1fr; min-height: 420px; }
  .file-rail { display: grid; grid-template-columns: repeat(3, 1fr); gap: 5px; padding: 8px; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.08); }
  .file-item, .file-item + .file-item { gap: 5px; margin: 0; padding: 7px 5px; }
  .file-item b { flex-basis: 24px; width: 24px; height: 24px; }
  .file-item span { font-size: 8px; }
  .file-item small { display: none; }
  .paper { width: 91%; min-height: 300px; margin-top: 12px; padding: 20px 22px; }
  .paper h2 { margin: 18px 0 14px; font-size: 13px; }
  .paper-field { grid-template-columns: 64px 1fr; padding: 7px 0; }
  .paper-signatures { margin-top: 18px; }
  .review-bar { align-items: flex-start; flex-direction: column; }
  .proof-strip { width: calc(100% - 32px); }
  .proof-strip div { min-height: 82px; padding: 13px; }
  .proof-strip strong { font-size: 22px; }
  .proof-strip span { font-size: 10px; }
  .section { padding: 76px 16px; }
  .section-heading { margin-bottom: 34px; }
  .section-heading h2, .legal h2, .boundary h2, .instructor h2, .offer h2, .register h2 { font-size: 35px; line-height: 1.12; }
  .section-heading > p:last-child, .legal-copy > p, .offer-copy > p, .register-copy > p { margin-top: 18px; font-size: 15px; }
  .pain-grid { grid-template-columns: 1fr; }
  .pain-grid article { min-height: 190px; padding: 22px; }
  .pain-grid h3 { margin-top: 42px; }
  .walkthrough-grid { gap: 32px; }
  .work-steps { grid-template-columns: 1fr; }
  .work-steps li { min-height: auto; }
  .work-output { min-height: 380px; padding: 16px; }
  .output-head { display: block; }
  .output-head b { display: block; margin-top: 7px; }
  .output-body { min-height: 250px; padding-right: 0; padding-left: 0; }
  .input-file { grid-template-columns: 34px 1fr auto; gap: 10px; padding: 11px; }
  .input-file i { width: 34px; height: 34px; }
  .case-card { min-height: auto; padding: 26px 22px; }
  .case-card h3 { margin-top: 44px; font-size: 29px; }
  .document-grid { grid-template-columns: 1fr; }
  .document-grid article { min-height: 180px; padding: 22px; }
  .document-grid h3 { margin-top: 36px; }
  .legal { gap: 42px; }
  .lesson-list article { grid-template-columns: 46px 1fr; gap: 14px; }
  .lesson-number { font-size: 26px; }
  .lesson-list h3 { font-size: 23px; }
  .boundary-grid { gap: 34px; }
  .boundary-note { margin-top: 38px; }
  .instructor { gap: 42px; padding-top: 76px; }
  .portrait-wrap { max-width: 100%; }
  .instructor-copy blockquote { font-size: 21px; }
  .offer { gap: 42px; }
  .price-card { padding: 24px 20px; }
  .price-head strong { font-size: 43px; }
  .faq-list summary { min-height: 64px; font-size: 13px; }
  .cross-upsell { padding: 72px 16px; }
  .cross-upsell-intro { margin-bottom: 28px; }
  .cross-upsell-intro h2 { font-size: 34px; }
  .cross-upsell-intro > p:last-child { font-size: 15px; }
  .cross-card-top { padding: 22px 18px 14px; }
  .cross-card-offer { padding: 18px; }
  .cross-card h3 { font-size: 28px; }
  .cross-card-offer > strong { font-size: 32px; }
  .register { gap: 42px; padding: 76px 16px calc(128px + env(safe-area-inset-bottom)); }
  .contact-cards { grid-template-columns: 1fr; }
  .form-shell { min-height: auto; padding: 24px 18px; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .site-footer { display: grid; padding-right: 16px; padding-left: 16px; }
  .site-footer nav { flex-wrap: wrap; }
  .cookie-banner { right: 12px; bottom: calc(76px + env(safe-area-inset-bottom)); width: calc(100% - 24px); }
  .policy-content { padding-top: 64px; }
  .policy-content h1 { font-size: 42px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}