:root {
  --green: #176c2b;
  --signal: #39ff68;
  --ink: #101310;
  --paper: #f7f7f2;
  --white: #ffffff;
  --line: #cfd3cd;
  --muted: #626862;
  --sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --serif: "Noto Serif TC", "Songti TC", "PMingLiU", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
[id] { scroll-margin-top: 78px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); font-size: 16px; line-height: 1.8; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
code { padding: 2px 5px; background: #e8ebe6; font-family: var(--sans); font-size: 16px; }

.article-header {
  position: sticky;
  z-index: 20;
  top: 0;
  height: 78px;
  display: grid;
  grid-template-columns: 170px 1fr auto;
  align-items: center;
  gap: 30px;
  padding: 0 32px;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}
.article-brand { width: 108px; height: 58px; overflow: hidden; }
.article-brand img { width: 76px; height: 76px; object-fit: cover; transform: translateY(-8px); }
.article-header nav { display: flex; justify-content: center; gap: clamp(20px, 4vw, 56px); font-size: 13px; font-weight: 800; }
.article-header nav a, .back-home { padding: 8px 0; border-bottom: 2px solid transparent; }
.article-header nav a:hover, .article-header nav a:focus-visible, .back-home:hover, .back-home:focus-visible { color: var(--green); border-color: var(--green); }
.back-home { font-weight: 900; }

.article-hero {
  min-height: calc(100svh - 78px);
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, .6fr);
  gap: clamp(42px, 7vw, 120px);
  align-items: end;
  padding: clamp(80px, 10vw, 160px) clamp(24px, 7vw, 110px);
  background: var(--white);
}
.article-hero h1 { margin: 0; font-family: var(--serif); font-size: clamp(58px, 7vw, 96px); font-weight: 900; line-height: 1.07; letter-spacing: -.035em; }
.article-hero h1 span { display: block; white-space: nowrap; }
.hero-intro { padding-bottom: 12px; }
.hero-intro p { margin: 0 0 36px; font-size: clamp(18px, 1.45vw, 22px); }
.hero-intro a { display: inline-block; padding-bottom: 8px; border-bottom: 2px solid var(--ink); font-weight: 900; }
.hero-intro a:hover { color: var(--green); border-color: var(--green); }

.metaphor { display: grid; grid-template-columns: 1fr 1fr; color: var(--white); background: var(--ink); }
.metaphor > div { min-height: 480px; display: flex; flex-direction: column; justify-content: space-between; padding: clamp(50px, 7vw, 110px); }
.metaphor > div + div { color: var(--white); background: var(--green); }
.metaphor h2 { max-width: 8em; margin: 0; font-family: var(--serif); font-size: clamp(46px, 5.6vw, 86px); line-height: 1.08; letter-spacing: -.035em; }
.metaphor p { max-width: 31em; margin: 70px 0 0; font-size: clamp(18px, 1.5vw, 23px); }

.definition, .preferred-source, .seed-example, .article-faq {
  display: grid;
  grid-template-columns: minmax(280px, .65fr) minmax(0, 1.35fr);
  gap: clamp(48px, 9vw, 150px);
  padding: clamp(80px, 10vw, 150px) clamp(24px, 7vw, 110px);
  background: var(--white);
  border-bottom: 1px solid var(--line);
}
.definition h2, .preferred-source h2, .seed-example h2, .article-faq h2, .checks > h2, .no-shortcuts > h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(48px, 6vw, 92px);
  line-height: 1.05;
  letter-spacing: -.035em;
}
.definition-copy { max-width: 760px; }
.definition-copy .lead { margin-top: 0; font-size: clamp(24px, 2.2vw, 34px); font-weight: 800; line-height: 1.48; }
.definition-copy p:last-child { margin-bottom: 0; }

.checks { padding: clamp(80px, 10vw, 150px) clamp(24px, 7vw, 110px); background: var(--paper); }
.checks > h2 { max-width: 9em; margin-bottom: 80px; }
.check-list { border-top: 2px solid var(--ink); }
.check-list section { display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(30px, 6vw, 100px); padding: 34px 0; border-bottom: 1px solid var(--line); }
.check-list h3 { margin: 0; font-size: clamp(23px, 2.4vw, 36px); line-height: 1.35; }
.check-list p { max-width: 48em; margin: 0; }

.no-shortcuts { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(48px, 9vw, 150px); padding: clamp(80px, 10vw, 150px) clamp(24px, 7vw, 110px); color: var(--white); background: var(--ink); }
.shortcut-list { border-top: 2px solid var(--white); }
.shortcut-list p { margin: 0; padding: 28px 0; border-bottom: 1px solid #4b504b; font-size: clamp(18px, 1.6vw, 24px); }
.shortcut-list strong { color: var(--signal); }

.preferred-source { background: var(--paper); }
.preferred-source > div:last-child, .seed-example > div:last-child { max-width: 760px; }
.source-links { display: flex; flex-wrap: wrap; gap: 12px 28px; margin-top: 34px; padding-top: 24px; border-top: 1px solid var(--line); }
.source-links a { font-weight: 800; text-decoration: underline; text-underline-offset: 5px; }
.source-links a:hover { color: var(--green); }

.seed-example { color: var(--white); background: var(--green); }
.seed-example h2 { font-size: clamp(44px, 3.6vw, 52px); }
.seed-example h2 span { display: block; white-space: nowrap; }
.seed-example p:first-child { margin-top: 0; font-size: clamp(21px, 1.9vw, 29px); font-weight: 800; }

.article-faq > div:last-child { border-top: 2px solid var(--ink); }
.article-faq details { border-bottom: 1px solid var(--line); }
.article-faq summary { display: flex; justify-content: space-between; gap: 24px; padding: 25px 0; cursor: pointer; list-style: none; font-size: clamp(19px, 1.7vw, 27px); font-weight: 800; }
.article-faq summary::-webkit-details-marker { display: none; }
.faq-toggle { position: relative; flex: 0 0 22px; width: 22px; height: 22px; margin-top: 4px; }
.faq-toggle::before, .faq-toggle::after { content: ""; position: absolute; top: 10px; left: 2px; width: 18px; height: 2px; background: var(--green); }
.faq-toggle::after { transform: rotate(90deg); transition: transform 160ms ease; }
.article-faq details[open] .faq-toggle::after { transform: rotate(90deg) scaleX(0); }
.article-faq details p { max-width: 48em; margin: 0; padding: 0 48px 28px 0; color: var(--muted); }

.article-contact { padding: clamp(80px, 10vw, 150px) clamp(24px, 7vw, 110px); color: var(--white); background: var(--ink); }
.article-contact h2 { margin: 0 0 48px; font-family: var(--serif); font-size: clamp(54px, 7vw, 96px); line-height: 1; letter-spacing: -.035em; }
.article-contact h2 span { display: block; white-space: nowrap; }
.article-contact p { max-width: 42em; margin: 0 0 36px; font-size: clamp(18px, 1.5vw, 23px); }
.article-contact > a { display: inline-block; padding: 16px 22px; color: var(--ink); background: var(--signal); font-weight: 900; transition: color 160ms ease, background-color 160ms ease, transform 160ms ease; }
.article-contact > a:hover, .article-contact > a:focus-visible { color: var(--white); background: var(--green); }
.article-contact > a:active { transform: translateY(2px); }

.article-footer { min-height: 210px; display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: end; gap: 30px; padding: 42px clamp(24px, 7vw, 110px); background: var(--white); }
.article-footer img { width: 110px; }
.article-footer p { margin: 0; }
.article-footer p:last-child { text-align: right; color: var(--muted); }

:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; }

@media (max-width: 1040px) {
  .article-header nav { display: none; }
  .article-header { grid-template-columns: 1fr auto; }
  .article-hero { grid-template-columns: 1fr; align-content: end; }
  .hero-intro { max-width: 660px; }
  .definition, .preferred-source, .seed-example, .article-faq, .no-shortcuts { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  [id] { scroll-margin-top: 68px; }
  body { font-size: 16px; }
  .article-header { height: 68px; padding: 0 16px; }
  .article-brand { height: 54px; }
  .article-brand img { width: 70px; height: 70px; }
  .back-home { font-size: 15px; }
  .article-hero { min-height: calc(100svh - 68px); gap: 38px; padding: 72px 24px 58px; }
  .article-hero h1 { font-size: 31px; line-height: 1.18; letter-spacing: -.035em; }
  .article-hero h1 span { white-space: nowrap; }
  .hero-intro p { font-size: 17px; }
  .metaphor { grid-template-columns: 1fr; }
  .metaphor > div { min-height: 370px; padding: 60px 24px; }
  .metaphor h2 { font-size: 48px; }
  .metaphor p { margin-top: 54px; }
  .definition, .preferred-source, .seed-example, .article-faq, .no-shortcuts, .checks { padding: 76px 24px; }
  .definition h2, .preferred-source h2, .article-faq h2, .checks > h2, .no-shortcuts > h2 { font-size: 52px; }
  .seed-example h2 { font-size: 44px; }
  .check-list section { grid-template-columns: 1fr; gap: 14px; padding: 28px 0; }
  .checks > h2 { margin-bottom: 50px; }
  .check-list h3 { font-size: 26px; }
  .source-links { flex-direction: column; align-items: flex-start; }
  .article-contact { padding: 76px 24px; }
  .article-contact h2 { font-size: 43px; }
  .article-contact h2 span { white-space: nowrap; }
  .article-footer { grid-template-columns: 1fr; align-items: start; }
  .article-footer p:last-child { text-align: left; }
}

@media (max-width: 390px) {
  .article-hero h1 { font-size: 29px; }
  .article-contact h2 { font-size: 40px; }
}

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