:root{--c-cream-50:#FFF9EF;--c-cream-100:#FCF5E8;--c-cream-200:#F6EAD3;--c-orange-50:#FFF1E4;--c-orange-200:#FBC6A0;--c-orange-500:#E8753F;--c-orange-600:#D55F26;--c-orange-700:#B14A18;--c-navy-700:#2D3142;--c-navy-800:#1F2335;--c-navy-900:#13172A;--c-text:#2D3142;--c-text-muted:#6B7280;--c-bg:#FFFBF3;--c-card:#FFFFFF;--c-line:#F1E4CC;--c-success:#2D8659;--c-info:#2563EB;--c-warn:#E8A03F;--c-danger:#C0392B;--radius-sm:8px;--radius:14px;--radius-lg:22px;--radius-xl:28px;--shadow-sm:0 2px 6px rgba(45,49,66,.06);--shadow:0 8px 24px rgba(45,49,66,.08);--shadow-lg:0 20px 50px rgba(45,49,66,.12);--max-w:1180px;--gutter:clamp(16px,3vw,32px);--f-display:'Be Vietnam Pro','Plus Jakarta Sans',system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;--f-body:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica 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var(--c-line)}.btn-ghost:hover{border-color:var(--c-orange-500);color:var(--c-orange-700)}.btn-sm{padding:8px 16px;font-size:.9rem}.hero{position:relative;background:linear-gradient(180deg,var(--c-cream-50) 0%,var(--c-cream-100) 100%);overflow:hidden}.hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 20% 10%,rgba(232,117,63,.16),transparent 38%),radial-gradient(circle at 90% 30%,rgba(232,117,63,.10),transparent 35%);pointer-events:none}.hero__inner{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding:clamp(48px,7vw,96px) 0}@media (max-width:900px){.hero__inner{grid-template-columns:1fr;text-align:center}}.eyebrow{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--c-line);color:var(--c-orange-700);padding:6px 14px;border-radius:999px;font-size:.85rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.hero h1 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p{margin:0;color:var(--c-text-muted)}.callout{background:var(--c-navy-800);color:#fff;border-radius:var(--radius-lg);padding:24px 28px;box-shadow:var(--shadow);position:relative;overflow:hidden}.callout::before{content:"";position:absolute;top:-30px;right:-30px;width:160px;height:160px;background:radial-gradient(circle,rgba(232,117,63,.28),transparent 70%)}.callout h3{color:#fff;margin-bottom:6px}.callout p{color:#FCD9C2;margin:0}.compare{overflow-x:auto;border:1px solid var(--c-line);border-radius:var(--radius);background:#fff;-webkit-overflow-scrolling:touch}.compare table{width:100%;border-collapse:collapse;min-width:560px}.compare th,.compare td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--c-line);font-size:.95rem;vertical-align:top}.compare th{background:var(--c-cream-100);font-weight:700;color:var(--c-navy-800)}.compare tr:last-child td{border-bottom:0}.tip{background:linear-gradient(135deg,var(--c-orange-50),#FFF7ED);border:1px solid #F8D5B5;border-radius:var(--radius);padding:16px 20px;display:flex;gap:14px;align-items:flex-start}.tip__icon{flex:0 0 36px;height:36px;border-radius:10px;background:var(--c-orange-500);color:#fff;display:grid;place-items:center;font-size:1.1rem;font-weight:800}.tip strong{display:block;color:var(--c-orange-700);margin-bottom:4px}.lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:36px}@media (max-width:640px){.lesson-nav{grid-template-columns:1fr}}.lesson-nav a{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:14px 18px;color:var(--c-navy-800);transition:border-color .2s,transform .15s}.lesson-nav a:hover{border-color:var(--c-orange-500);transform:translateY(-1px);color:var(--c-orange-700)}.lesson-nav a span{display:block;font-size:.75rem;color:var(--c-text-muted);text-transform:uppercase;letter-spacing:.06em;font-weight:700}.lesson-nav a strong{display:block;font-size:1rem;color:var(--c-navy-800)}.lesson-nav .next{justify-content:flex-end;text-align:right}.site-footer{background:var(--c-navy-900);color:#D6D9E3;padding:36px 0 22px;margin-top:48px}.site-footer a{color:#FFCFAA}.site-footer__top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px}.site-footer__brand{display:flex;align-items:center;gap:10px;font-weight:800;color:#fff}.site-footer__bottom{margin-top:18px;padding-top:18px;border-top:1px solid #2A2F46;font-size:.85rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;color:#8E94A8}.fade-in{opacity:0;transform:translateY(12px);animation:fade .55s ease forwards}@keyframes fade{to{opacity:1;transform:none}}.skip-link{position:absolute;left:-1000px;top:auto;width:1px;height:1px;overflow:hidden}.skip-link:focus{position:fixed;left:8px;top:8px;width:auto;height:auto;background:#fff;padding:8px 14px;border-radius:8px;z-index:100;border:2px solid 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.15s,transform .15s}.outline a:hover{border-color:var(--c-orange-500);transform:translateY(-1px)}.outline a .n{flex:0 0 36px;height:36px;border-radius:10px;background:var(--c-orange-50);color:var(--c-orange-700);display:grid;place-items:center;font-weight:800}.toc{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:18px 20px}.toc h4{margin:0 0 10px;color:var(--c-orange-700)}.toc ol{margin:0;padding-left:1.2em}.toc a{color:var(--c-navy-800);font-weight:600}.toc a:hover{color:var(--c-orange-700)}.original-figure{margin-top:32px;text-align:center}.original-figure figcaption{margin-top:10px;font-size:.85rem;color:var(--c-text-muted)}.original-figure img{margin:0 auto;border-radius:var(--radius-lg);box-shadow:var(--shadow);border:1px solid 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