@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;600;700;800&family=Noto+Serif+TC:wght@600;700;900&display=swap');

:root {
  --ink: #0b1d2a;
  --ink-2: #132e40;
  --paper: #f3eee5;
  --paper-2: #faf7f1;
  --coral: #ff6534;
  --blue: #3153d8;
  --mint: #a8d9cf;
  --muted: #61707a;
  --line: rgba(11,29,42,.16);
  --max: 1200px;
  --sans: 'Noto Sans TC', sans-serif;
  --serif: 'Noto Serif TC', serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper-2); color: var(--ink); font-family: var(--sans); line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(var(--max), calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 99; padding: 12px 18px; background: white; }
.skip-link:focus { top: 12px; }

.site-header { position: sticky; top: 0; z-index: 20; min-height: 84px; border-bottom: 1px solid rgba(255,255,255,.12); background: rgba(11,29,42,.95); color: white; backdrop-filter: blur(16px); }
.header-inner { width: min(var(--max), calc(100% - 40px)); min-height: 84px; margin: auto; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; }
.brand { display: flex; align-items: center; gap: 10px; letter-spacing: .15em; }
.brand-mark { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; background: var(--coral); color: var(--ink); font-size: 22px; font-weight: 900; }
.brand-name b, .brand-name small { display: block; }
.brand-name small { color: rgba(255,255,255,.65); font-size: 8px; }
.site-nav { display: flex; align-self: stretch; gap: 28px; }
.site-nav a { display: flex; flex-direction: column; justify-content: center; border-bottom: 3px solid transparent; color: #7589e9; font-size: 9px; font-weight: 800; letter-spacing: .13em; }
.site-nav small { color: white; font-size: 13px; letter-spacing: .04em; }
.site-nav a.active { border-color: var(--coral); }
.header-actions { justify-self: end; display: flex; align-items: center; gap: 8px; }
.header-cta { display: flex; align-items: center; min-height: 44px; padding: 10px 20px; border: 1px solid rgba(255,255,255,.25); border-radius: 999px; font-size: 13px; font-weight: 700; }
.nav-toggle { display: none; width: 44px; height: 44px; padding: 0; border: 1px solid rgba(255,255,255,.25); border-radius: 12px; background: transparent; place-content: center; gap: 6px; cursor: pointer; }
.nav-toggle span { display: block; width: 18px; height: 2px; background: white; transition: transform .2s ease; }
.site-header.menu-open .nav-toggle span:first-child { transform: translateY(4px) rotate(45deg); }
.site-header.menu-open .nav-toggle span:last-child { transform: translateY(-4px) rotate(-45deg); }

.article-hero { padding: 90px 0 100px; overflow: hidden; background: radial-gradient(circle at 78% 8%, #173e78 0, transparent 38%), linear-gradient(135deg, #071d29, #0d3340); color: white; }
.article-hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 70px; align-items: center; }
.article-back { display: inline-flex; min-height: 44px; align-items: center; color: var(--mint); font-size: 13px; font-weight: 700; }
.article-back::before { content: '←'; margin-right: 9px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 18px; margin: 28px 0 18px; color: rgba(255,255,255,.68); font-size: 12px; letter-spacing: .08em; }
.article-meta span:first-child { color: var(--coral); font-weight: 800; }
.article-hero h1 { max-width: 15ch; margin: 0; font: 700 clamp(46px, 5.3vw, 78px)/1.16 var(--serif); letter-spacing: -.04em; }
.article-hero .lead { max-width: 55ch; color: rgba(255,255,255,.74); font-size: 18px; }
.media-card { position: relative; margin: 0; overflow: hidden; border: 1px solid rgba(255,255,255,.22); border-radius: 210px 210px 28px 28px; background: var(--paper-2); box-shadow: 0 30px 80px rgba(0,0,0,.3); }
.media-card img { width: 100%; aspect-ratio: 4 / 4.2; object-fit: cover; }
.media-card figcaption { padding: 18px 24px; color: var(--muted); font-size: 12px; }

.article-layout { padding-top: 96px; padding-bottom: 108px; }
.article-layout.content-only { display: block; }
.article-body { max-width: 70ch; margin: auto; font-size: 18px; }
.article-body > p:first-child { font-size: 23px; line-height: 1.65; }
.article-body > p:first-child::first-letter { float: left; margin: 8px 10px 0 0; color: var(--coral); font: 700 68px/.75 var(--serif); }
.article-body p { margin: 0 0 1.5em; }
.article-body h2 { margin: 2.1em 0 .7em; padding-top: .6em; border-top: 1px solid var(--line); font: 700 clamp(31px, 4vw, 46px)/1.35 var(--serif); letter-spacing: -.025em; }
.article-body h3 { margin: 1.8em 0 .55em; font: 700 26px/1.4 var(--serif); }
.article-body ul, .article-body ol { margin: 0 0 1.8em; padding-left: 1.5em; }
.article-body li { margin: .6em 0; padding-left: .35em; }
.article-body a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }
.article-body blockquote { margin: 2.4em 0; padding: 28px 32px; border-left: 5px solid var(--coral); background: var(--paper); font: 600 24px/1.55 var(--serif); }

.formula-card,
.callout-card,
.quote-share-card,
.comparison-card,
.model-card,
.table-card { margin: 2.2em 0; border: 1px solid var(--line); border-radius: 24px; background: var(--paper); box-shadow: 0 18px 50px rgba(11,29,42,.08); }
.formula-card { padding: 30px; text-align: center; }
.formula-card small { display: block; color: var(--coral); font-size: 11px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.formula-card strong { display: block; margin-top: 10px; font: 700 clamp(28px, 4vw, 44px)/1.35 var(--serif); }
.formula-card p { margin: 10px auto 0; color: var(--muted); font-size: 14px; }
.callout-card { padding: 28px 30px; border-left: 5px solid var(--blue); }
.callout-card h3 { margin: 0 0 12px; font-size: 24px; }
.callout-card ol,
.callout-card ul { margin-bottom: 0; }
.pull-quote { position: relative; margin: 2.4em 0; padding: 34px 36px 30px; color: white; background: linear-gradient(135deg, var(--ink), var(--ink-2)); border-radius: 24px; font: 700 clamp(25px, 4vw, 38px)/1.5 var(--serif); }
.pull-quote::before { position: absolute; top: 10px; left: 18px; color: var(--coral); content: '“'; font-size: 58px; line-height: 1; }
.comparison-card { overflow: hidden; }
.comparison-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.comparison-column { padding: 28px; }
.comparison-column + .comparison-column { border-left: 1px solid var(--line); background: rgba(168,217,207,.18); }
.comparison-column small { color: var(--coral); font-size: 11px; font-weight: 800; letter-spacing: .14em; }
.comparison-column h3 { margin: 8px 0 14px; font-size: 26px; }
.comparison-column ul { margin-bottom: 0; }
.checklist { padding: 28px 30px; }
.checklist h3 { margin-top: 0; }
.checklist ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 24px; padding: 0; list-style: none; }
.checklist li { position: relative; margin: 0; padding: 10px 10px 10px 34px; border-bottom: 1px solid var(--line); }
.checklist li::before { position: absolute; left: 5px; color: var(--blue); content: '✓'; font-weight: 900; }
.model-card { padding: 30px; }
.venn-model { position: relative; width: min(100%, 520px); height: 390px; margin: 12px auto 24px; }
.venn-circle { position: absolute; display: grid; width: 220px; height: 220px; place-items: center; padding: 32px; border: 2px solid currentColor; border-radius: 50%; font-weight: 800; text-align: center; }
.venn-circle:nth-child(1) { top: 0; left: 50%; color: var(--blue); transform: translateX(-50%); }
.venn-circle:nth-child(2) { top: 112px; left: 30px; color: var(--coral); }
.venn-circle:nth-child(3) { top: 112px; right: 30px; color: #12806a; }
.venn-circle:nth-child(4) { right: 50%; bottom: 0; color: #8c5bbd; transform: translateX(50%); }
.venn-center { position: absolute; z-index: 2; top: 50%; left: 50%; width: 116px; padding: 12px; color: white; background: var(--ink); border-radius: 999px; font-size: 13px; font-weight: 900; text-align: center; transform: translate(-50%,-50%); }
.table-card { overflow-x: auto; }
.article-table { width: 100%; min-width: 620px; border-collapse: collapse; }
.article-table th,
.article-table td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.article-table th { color: white; background: var(--ink); font-size: 13px; }
.article-table tr:last-child td { border-bottom: 0; }
.quote-share-card { padding: 30px; }
.quote-share-card small { color: var(--coral); font-size: 11px; font-weight: 800; letter-spacing: .14em; }
.quote-share-card blockquote { margin: 14px 0 22px; padding: 0; border: 0; background: transparent; font-size: clamp(23px, 3.2vw, 32px); }
.quote-share-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.quote-share-actions button,
.quote-share-actions a { min-height: 44px; padding: 10px 16px; color: var(--ink); background: white; border: 1px solid var(--line); border-radius: 12px; font: 700 13px var(--sans); cursor: pointer; }
.quote-share-actions button:hover,
.quote-share-actions a:hover { border-color: var(--blue); }

.section { padding: 100px 0; }
.section.soft { background: var(--paper); }
.section.ink { background: linear-gradient(145deg, var(--ink), var(--ink-2)); color: white; }
.section-header { max-width: 820px; margin-bottom: 42px; }
.eyebrow { color: var(--coral); font-size: 12px; font-weight: 800; letter-spacing: .2em; text-transform: uppercase; }
.section-header h2, .cta-panel h2 { margin: 10px 0; font: 700 clamp(36px, 4.5vw, 60px)/1.25 var(--serif); letter-spacing: -.03em; }
.section-header .lead, .cta-panel .lead { color: var(--muted); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.value-card { min-height: 240px; padding: 26px; border: 1px solid var(--line); border-radius: 24px; background: var(--paper-2); }
.card-label { color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .1em; }
.value-card p { font-size: 14px; }
.cta-panel { display: grid; grid-template-columns: 1.2fr .8fr; gap: 70px; align-items: end; }
.cta-panel .lead { color: rgba(255,255,255,.7); }
.cta-actions { display: flex; justify-content: flex-end; gap: 12px; flex-wrap: wrap; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 22px; border: 1px solid transparent; border-radius: 12px; font-size: 14px; font-weight: 700; }
.button.primary { background: var(--coral); color: var(--ink); }
.button.ghost { border-color: rgba(255,255,255,.35); color: white; }

.related-section { padding: 96px 0; background: var(--paper); }
.related-heading { max-width: 760px; margin-bottom: 40px; }
.related-heading h2 { margin: 8px 0 0; font: 700 clamp(34px, 4.5vw, 58px)/1.25 var(--serif); letter-spacing: -.03em; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.related-card { display: grid; min-height: 230px; padding: 26px; border: 1px solid var(--line); border-radius: 24px; background: var(--paper-2); box-shadow: 0 18px 50px rgba(11,29,42,.07); }
.related-card span { color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .08em; }
.related-card b { align-self: center; font: 700 23px/1.4 var(--serif); }
.related-card small { align-self: end; color: var(--coral); font-weight: 800; }
.article-pagination { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 32px; padding-top: 28px; border-top: 1px solid var(--line); }
.article-pagination a { display: grid; min-height: 88px; padding: 16px 18px; border-radius: 14px; background: rgba(255,255,255,.55); }
.article-pagination small { color: var(--coral); font-weight: 800; }
.article-pagination b { align-self: end; font: 700 17px/1.45 var(--serif); }
.article-pagination .next { text-align: right; }

.footer { padding: 46px 0; background: var(--ink); color: white; }
.footer-inner { width: min(var(--max), calc(100% - 40px)); margin: auto; display: flex; align-items: center; gap: 30px; }
.footer-inner p { margin-right: auto; color: rgba(255,255,255,.6); }
.footer-nav { display: flex; gap: 20px; }
.footer-nav a { min-height: 44px; display: flex; align-items: center; }
:focus-visible { outline: 3px solid var(--mint); outline-offset: 4px; }

@media (max-width: 1020px) {
  .header-inner { grid-template-columns: 1fr auto; }
  .site-nav { display: none; }
  .nav-toggle { display: grid; }
  .site-header.menu-open .site-nav { position: absolute; top: 84px; left: max(20px, calc((100vw - var(--max)) / 2)); right: max(20px, calc((100vw - var(--max)) / 2)); display: grid; height: auto; gap: 0; padding: 10px; border: 1px solid rgba(255,255,255,.15); border-radius: 0 0 18px 18px; background: var(--ink-2); box-shadow: 0 24px 60px rgba(0,0,0,.32); }
  .site-header.menu-open .site-nav a { min-height: 56px; padding: 8px 12px; border-bottom: 1px solid rgba(255,255,255,.12); }
  .site-header.menu-open .site-nav a:last-child { border-bottom: 0; }
  .article-hero-grid, .cta-panel { grid-template-columns: 1fr; }
  .article-hero h1 { max-width: 18ch; }
  .media-card { max-width: 650px; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .cta-actions { justify-content: flex-start; }
}

@media (max-width: 640px) {
  .container, .header-inner, .footer-inner { width: min(100% - 32px, var(--max)); }
  .site-header, .header-inner { min-height: 72px; }
  .header-cta { padding: 10px 13px; }
  .site-header.menu-open .site-nav { top: 72px; left: 16px; right: 16px; }
  .article-hero { padding: 64px 0 76px; }
  .article-hero-grid { gap: 48px; }
  .article-hero h1 { font-size: clamp(39px, 11.5vw, 50px); }
  .article-hero .lead { font-size: 16px; }
  .media-card { border-radius: 110px 110px 22px 22px; }
  .article-layout { padding-top: 70px; padding-bottom: 82px; }
  .article-body { font-size: 17px; }
  .article-body > p:first-child { font-size: 20px; }
  .comparison-grid,
  .checklist ul { grid-template-columns: 1fr; }
  .comparison-column + .comparison-column { border-top: 1px solid var(--line); border-left: 0; }
  .formula-card,
  .callout-card,
  .quote-share-card,
  .model-card { padding: 22px 20px; }
  .venn-model { height: auto; display: grid; gap: 10px; }
  .venn-circle { position: static; width: 100%; height: auto; min-height: 76px; border-radius: 18px; transform: none !important; }
  .venn-center { position: static; width: 100%; transform: none; }
  .section { padding: 82px 0; }
  .grid-4 { grid-template-columns: 1fr; }
  .related-section { padding: 82px 0; }
  .related-grid, .article-pagination { grid-template-columns: 1fr; }
  .related-card { min-height: 190px; }
  .article-pagination .next { text-align: left; }
  .value-card { min-height: auto; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-inner p { margin: 0; }
  .footer-nav { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}