:root {
  --ink: #102a2a;
  --muted: #607272;
  --primary: #0f766e;
  --primary-2: #14b8a6;
  --navy: #0b2f33;
  --soft: #effaf8;
  --soft-2: #f7fbfa;
  --line: #dce9e6;
  --white: #ffffff;
  --shadow: 0 20px 60px rgba(15, 61, 60, .12);
  --radius: 24px;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "Be Vietnam Pro", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  background: #fff;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input { font: inherit; }
.container { width: min(calc(100% - 36px), var(--container)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(15,118,110,.08);
}
.nav-wrap { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center;
  color: #fff; font-size: 1.35rem; font-weight: 800; background: linear-gradient(145deg,var(--primary),var(--primary-2));
  box-shadow: 0 10px 28px rgba(15,118,110,.24);
}
.brand strong { display: block; font-size: .92rem; letter-spacing: .02em; }
.brand small { display: block; color: var(--muted); font-size: .7rem; margin-top: -2px; }
.nav { display: flex; align-items: center; gap: 22px; font-size: .88rem; font-weight: 600; }
.nav a:not(.nav-cta):hover { color: var(--primary); }
.nav-cta { padding: 10px 15px; border-radius: 999px; background: var(--ink); color: #fff; }
.menu-toggle { display: none; border: 0; background: none; font-size: 1.6rem; cursor: pointer; }

.hero {
  position: relative;
  overflow: hidden;
  min-height: 720px;
  display: flex;
  align-items: center;
  background:
    radial-gradient(circle at 15% 20%, rgba(20,184,166,.13), transparent 28%),
    linear-gradient(180deg, #f9fffd 0%, #ffffff 100%);
}
.hero::after {
  content: ""; position: absolute; inset: auto 0 0 0; height: 110px;
  background: linear-gradient(to bottom, transparent, rgba(239,250,248,.6)); pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 64px; padding: 92px 0 110px; position: relative; z-index: 2; }
.eyebrow { color: var(--primary); font-size: .76rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.hero h1 { margin: 18px 0 24px; font-size: clamp(2.8rem,5.3vw,5rem); line-height: 1.06; letter-spacing: -.055em; }
.hero h1 span { color: var(--primary); }
.hero-lead { max-width: 680px; font-size: 1.08rem; color: var(--muted); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 32px 0 38px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 0 20px; border-radius: 14px; font-weight: 700; transition: .2s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: white; background: linear-gradient(135deg,var(--primary),#0d9488); box-shadow: 0 14px 35px rgba(15,118,110,.24); }
.btn-secondary { background: #fff; border: 1px solid var(--line); }
.btn-light { background: #fff; color: var(--navy); }
.hero-notes { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; max-width: 620px; }
.hero-notes div { padding: 13px 14px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.78); }
.hero-notes strong, .hero-notes span { display: block; }
.hero-notes strong { font-size: .72rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.hero-notes span { font-size: .88rem; font-weight: 700; margin-top: 3px; }

.hero-card { background: #fff; border: 1px solid var(--line); border-radius: 28px; box-shadow: var(--shadow); overflow: hidden; transform: rotate(1deg); }
.window-bar { height: 54px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 8px; padding: 0 18px; }
.window-bar span { width: 10px; height: 10px; border-radius: 50%; background: #c9d8d5; }
.window-bar em { margin-left: 8px; font-style: normal; font-size: .72rem; color: var(--muted); }
.learning-flow { padding: 28px; }
.flow-step { display: flex; align-items: center; gap: 16px; padding: 17px; border: 1px solid var(--line); border-radius: 16px; }
.flow-step i { width: 42px; height: 42px; border-radius: 13px; background: var(--soft); display: grid; place-items: center; font-style: normal; font-weight: 800; color: var(--primary); }
.flow-step b, .flow-step small { display: block; }
.flow-step small { color: var(--muted); margin-top: 2px; }
.flow-step.highlight { background: linear-gradient(135deg,var(--primary),#0d9488); color: #fff; border-color: transparent; }
.flow-step.highlight i { background: rgba(255,255,255,.16); color: #fff; }
.flow-step.highlight small { color: rgba(255,255,255,.8); }
.flow-line { width: 2px; height: 18px; margin: 0 0 0 38px; background: var(--line); }
.hero-orb { position: absolute; border-radius: 50%; filter: blur(2px); opacity: .6; }
.orb-a { width: 220px; height: 220px; background: rgba(20,184,166,.14); right: -70px; top: 80px; }
.orb-b { width: 140px; height: 140px; background: rgba(45,212,191,.12); left: -45px; bottom: 55px; }

.section { padding: 104px 0; }
.section-soft { background: var(--soft-2); }
.section-heading { max-width: 800px; margin-bottom: 44px; }
.section-heading h2 { margin: 12px 0 14px; font-size: clamp(2rem,3.6vw,3.25rem); line-height: 1.16; letter-spacing: -.04em; }
.section-heading p { color: var(--muted); font-size: 1.02rem; }

.problem-grid, .feature-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.info-card, .feature-card, .conclusion-card { border: 1px solid var(--line); border-radius: var(--radius); background: #fff; padding: 28px; }
.info-card .icon { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 14px; background: var(--soft); color: var(--primary); font-size: 1.25rem; font-weight: 800; }
.info-card h3, .feature-card h3 { margin: 20px 0 8px; font-size: 1.15rem; }
.info-card p, .feature-card p, .conclusion-card li { color: var(--muted); font-size: .94rem; }
.research-box { margin-top: 22px; padding: 32px; border-radius: 28px; background: var(--navy); color: #fff; display: grid; grid-template-columns: .9fr 1.1fr; gap: 40px; align-items: start; }
.box-label { display: inline-block; font-size: .72rem; text-transform: uppercase; letter-spacing: .11em; color: #5eead4; font-weight: 800; }
.research-box h3 { font-size: 1.55rem; line-height: 1.35; margin: 10px 0 0; }
.rq-list { display: grid; gap: 10px; }
.rq-list p { margin: 0; padding: 12px 14px; border: 1px solid rgba(255,255,255,.12); border-radius: 13px; color: rgba(255,255,255,.84); font-size: .9rem; }
.rq-list b { color: #5eead4; }

.feature-card { position: relative; overflow: hidden; }
.feature-card span { display: inline-flex; font-size: .74rem; font-weight: 800; color: var(--primary); letter-spacing: .08em; }
.feature-card::after { content:""; position: absolute; width: 76px; height: 76px; border-radius: 50%; right: -24px; top: -24px; background: var(--soft); }
.structure-card { margin-top: 24px; padding: 32px; border: 1px solid var(--line); border-radius: 28px; background: #fff; display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; align-items: center; }
.structure-card h3 { font-size: 2rem; margin: 10px 0; }
.structure-card p { color: var(--muted); }
.score-bars { display: grid; gap: 15px; }
.score-row { display: grid; grid-template-columns: 120px 1fr 82px; gap: 12px; align-items: center; font-size: .85rem; }
.score-row div { height: 10px; background: #e7f2f0; border-radius: 999px; overflow: hidden; }
.score-row i { display: block; height: 100%; background: linear-gradient(90deg,var(--primary),var(--primary-2)); border-radius: 999px; }
.score-row b { text-align: right; }

.timeline { position: relative; max-width: 900px; }
.timeline::before { content:""; position:absolute; left: 27px; top: 14px; bottom: 14px; width: 2px; background: var(--line); }
.timeline-item { position: relative; display: grid; grid-template-columns: 56px 1fr; gap: 20px; padding: 0 0 30px; }
.timeline-item b { width: 56px; height: 56px; border-radius: 50%; display: grid; place-items: center; color: #fff; background: var(--primary); z-index: 1; box-shadow: 0 8px 22px rgba(15,118,110,.2); }
.timeline-item h3 { margin: 3px 0 5px; }
.timeline-item p { margin: 0; color: var(--muted); }

.section-dark { background: #082f33; color: #fff; }
.section-heading.light p { color: rgba(255,255,255,.72); }
.section-dark .eyebrow { color: #5eead4; }
.stats-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; }
.stat-card { padding: 24px; border: 1px solid rgba(255,255,255,.12); border-radius: 20px; background: rgba(255,255,255,.055); }
.stat-card strong { display: block; color: #5eead4; font-size: 2.1rem; letter-spacing: -.04em; }
.stat-card span { display: block; margin-top: 6px; font-size: .85rem; color: rgba(255,255,255,.72); }
.result-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 18px; margin-top: 18px; }
.result-card { padding: 30px; border-radius: 24px; background: #fff; color: var(--ink); }
.result-tag { display: inline-block; padding: 6px 10px; border-radius: 999px; background: var(--soft); color: var(--primary); font-size: .72rem; font-weight: 800; }
.result-card h3 { line-height: 1.42; font-size: 1.22rem; }
.metric-row { display: flex; justify-content: space-between; padding: 12px 0; border-top: 1px solid var(--line); font-size: .9rem; }
.metric-row b { color: var(--primary); font-size: 1.05rem; }
.muted { color: var(--muted); font-size: .9rem; }
.note-pill { margin-top: 18px; display: inline-block; padding: 9px 12px; border-radius: 12px; background: #f5f9f8; color: #315655; font-size: .8rem; font-weight: 700; }
.insight-banner { margin-top: 18px; padding: 24px 28px; border-radius: 20px; background: linear-gradient(135deg,#0f766e,#0d9488); display: grid; grid-template-columns: 170px 1fr; gap: 20px; align-items: center; }
.insight-banner span { color: #99f6e4; font-size: .76rem; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; }
.insight-banner p { margin: 0; }

.conclusion-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 18px; }
.conclusion-card h3 { margin-top: 0; }
.conclusion-card ul { padding-left: 20px; margin-bottom: 0; }
.conclusion-card li + li { margin-top: 9px; }
.conclusion-card.accent { background: var(--soft); border-color: #cdebe5; }
.cta-panel { margin-top: 28px; padding: 34px; border-radius: 28px; background: linear-gradient(135deg,var(--navy),var(--primary)); color: #fff; display: flex; justify-content: space-between; align-items: center; gap: 30px; }
.cta-panel h2 { margin: 8px 0 8px; font-size: 2rem; }
.cta-panel p { margin: 0; color: rgba(255,255,255,.78); max-width: 760px; }
.cta-panel .eyebrow { color: #99f6e4; }

.footer { border-top: 1px solid var(--line); padding: 36px 0; background: #fbfdfd; }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: end; }
.footer p { margin: 5px 0 0; color: var(--muted); font-size: .82rem; }
.footer-links { display: flex; gap: 18px; font-size: .82rem; font-weight: 600; }
.copyright { grid-column: 1 / -1; padding-top: 18px; border-top: 1px solid var(--line); }
.back-top { position: fixed; right: 20px; bottom: 20px; width: 44px; height: 44px; border: 0; border-radius: 14px; color: #fff; background: var(--ink); cursor: pointer; box-shadow: 0 12px 30px rgba(0,0,0,.16); opacity: 0; pointer-events: none; transition: .2s; z-index: 50; }
.back-top.show { opacity: 1; pointer-events: auto; }

.reveal { opacity: 0; transform: translateY(18px); transition: .65s ease; }
.reveal.visible { opacity: 1; transform: none; }
.delay-1 { transition-delay: .08s; }
.delay-2 { transition-delay: .16s; }

@media (max-width: 980px) {
  .menu-toggle { display: block; }
  .nav { position: absolute; top: 76px; left: 18px; right: 18px; padding: 16px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: var(--shadow); display: none; flex-direction: column; align-items: stretch; gap: 8px; }
  .nav.open { display: flex; }
  .nav a { padding: 9px 10px; }
  .hero-grid { grid-template-columns: 1fr; gap: 36px; padding-top: 70px; }
  .hero { min-height: auto; }
  .hero-card { transform: none; max-width: 680px; }
  .problem-grid, .feature-grid { grid-template-columns: repeat(2,1fr); }
  .research-box, .structure-card { grid-template-columns: 1fr; gap: 26px; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 700px) {
  .section { padding: 76px 0; }
  .brand small { display: none; }
  .hero h1 { font-size: 2.65rem; }
  .hero-grid { padding-bottom: 84px; }
  .hero-notes, .problem-grid, .feature-grid, .result-grid, .conclusion-grid, .stats-grid { grid-template-columns: 1fr; }
  .hero-notes { max-width: none; }
  .learning-flow { padding: 18px; }
  .research-box, .structure-card, .info-card, .feature-card, .result-card, .conclusion-card, .cta-panel { padding: 23px; }
  .score-row { grid-template-columns: 1fr 80px; }
  .score-row div { grid-column: 1 / -1; grid-row: 2; }
  .score-row b { grid-column: 2; grid-row: 1; }
  .insight-banner { grid-template-columns: 1fr; }
  .cta-panel { flex-direction: column; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; }
  .copyright { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
}