:root {
  --ink: #17211d;
  --muted: #5e6b65;
  --paper: #f6f3eb;
  --surface: #fffdf8;
  --surface-strong: #ffffff;
  --line: #d9ddd7;
  --forest: #174f3c;
  --forest-dark: #0d3528;
  --mint: #d9efe5;
  --orange: #e77732;
  --orange-soft: #f9dfca;
  --blue: #335f83;
  --blue-soft: #dfeaf3;
  --violet: #665681;
  --violet-soft: #ebe4f2;
  --shadow: 0 20px 50px rgba(23, 33, 29, 0.09);
  --radius-lg: 30px;
  --radius-md: 20px;
  --radius-sm: 12px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% -10%, rgba(217, 239, 229, 0.95), transparent 28rem),
    var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 14px;
  color: white;
  background: var(--forest-dark);
  border-radius: 8px;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(23, 33, 29, 0.1);
  background: rgba(246, 243, 235, 0.9);
  backdrop-filter: blur(16px);
}

.nav-shell {
  width: min(calc(100% - 32px), var(--max-width));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  font-weight: 850;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  color: white;
  background: var(--forest);
  border-radius: 12px 12px 12px 4px;
  box-shadow: 0 8px 20px rgba(23, 79, 60, 0.2);
}

.brand small {
  display: block;
  margin-top: -3px;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.09em;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 5px;
  flex-wrap: wrap;
}

.site-nav a {
  padding: 9px 12px;
  color: var(--muted);
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--forest-dark);
  background: var(--mint);
}

.container {
  width: min(calc(100% - 32px), var(--max-width));
  margin-inline: auto;
}

.hero {
  padding: clamp(68px, 10vw, 124px) 0 64px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  align-items: center;
  gap: clamp(42px, 7vw, 90px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--forest);
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 32px;
  height: 2px;
  background: var(--orange);
}

.hero h1,
.page-hero h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(2.8rem, 7vw, 6rem);
  line-height: 1.01;
  letter-spacing: -0.065em;
}

.hero h1 em,
.page-hero h1 em {
  color: var(--forest);
  font-family: Georgia, "Noto Serif TC", serif;
  font-style: italic;
  font-weight: 500;
}

.hero-title-line {
  display: block;
}

.page-hero h1 em {
  display: block;
  margin-top: 0.08em;
}

.hero-copy {
  max-width: 700px;
  margin: 27px 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.hero-actions,
.card-actions,
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 11px;
  margin-top: 30px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid var(--forest);
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: white;
  background: var(--forest);
  box-shadow: 0 12px 24px rgba(23, 79, 60, 0.18);
}

.button-primary:hover {
  background: var(--forest-dark);
}

.button-secondary {
  color: var(--forest-dark);
  background: transparent;
}

.button-quiet {
  min-height: auto;
  padding: 7px 0;
  border: 0;
  border-radius: 0;
  color: var(--forest);
}

.hero-panel {
  position: relative;
  min-height: 430px;
  padding: 28px;
  overflow: hidden;
  color: white;
  background: var(--forest-dark);
  border-radius: 46px 46px 46px 12px;
  box-shadow: var(--shadow);
}

.hero-panel::before,
.hero-panel::after {
  content: "";
  position: absolute;
  border-radius: 50%;
}

.hero-panel::before {
  width: 260px;
  height: 260px;
  top: -90px;
  right: -60px;
  background: rgba(231, 119, 50, 0.85);
}

.hero-panel::after {
  width: 190px;
  height: 190px;
  right: 60px;
  bottom: -90px;
  border: 1px solid rgba(255, 255, 255, 0.34);
}

.panel-label,
.panel-list,
.panel-foot {
  position: relative;
  z-index: 1;
}

.panel-label {
  color: var(--orange-soft);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.panel-list {
  display: grid;
  gap: 0;
  margin: 46px 0 54px;
}

.panel-list a {
  display: grid;
  grid-template-columns: 42px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  text-decoration: none;
}

.panel-list a:first-child {
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.panel-list span:first-child {
  color: var(--orange-soft);
  font-size: 0.76rem;
  font-weight: 800;
}

.panel-list strong {
  font-size: 1.05rem;
}

.panel-list a:hover strong {
  color: var(--orange-soft);
}

.panel-foot {
  max-width: 260px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.86rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 56px;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.stat {
  padding: 23px;
  background: rgba(255, 253, 248, 0.92);
}

.stat strong {
  display: block;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.stat span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.85rem;
}

.section {
  padding: clamp(64px, 9vw, 108px) 0;
}

.section-tight {
  padding-top: 24px;
}

.section-head {
  max-width: 760px;
  margin-bottom: 38px;
}

.section-kicker {
  margin: 0 0 10px;
  color: var(--orange);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section h2,
.section-head h2 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.8rem);
  line-height: 1.06;
  letter-spacing: -0.045em;
}

.section-head p {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.category-card {
  min-height: 360px;
  display: flex;
  flex-direction: column;
  padding: clamp(26px, 4vw, 40px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.category-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.category-card:nth-child(2) {
  background: var(--orange-soft);
}

.category-card:nth-child(3) {
  background: var(--blue-soft);
}

.category-card:nth-child(4) {
  background: var(--violet-soft);
}

.category-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.category-number {
  color: var(--forest);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.12em;
}

.category-count {
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.55);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 750;
}

.category-card h3 {
  max-width: 500px;
  margin: 58px 0 12px;
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  line-height: 1.03;
  letter-spacing: -0.045em;
}

.category-card p {
  max-width: 560px;
  margin: 0;
  color: var(--muted);
}

.category-link {
  margin-top: auto;
  padding-top: 28px;
  color: var(--forest-dark);
  font-weight: 850;
}

.principles {
  color: white;
  background: var(--forest-dark);
}

.principles .section-kicker {
  color: var(--orange-soft);
}

.principles .section-head p {
  color: rgba(255, 255, 255, 0.68);
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.principle {
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
}

.principle span {
  color: var(--orange-soft);
  font-size: 0.78rem;
  font-weight: 850;
}

.principle h3 {
  margin: 30px 0 10px;
  font-size: 1.25rem;
}

.principle p {
  margin: 0;
  color: rgba(255, 255, 255, 0.67);
  font-size: 0.92rem;
}

.directory {
  border-top: 1px solid var(--line);
}

.directory-row {
  display: grid;
  grid-template-columns: minmax(170px, 0.62fr) minmax(240px, 1.4fr) auto;
  align-items: center;
  gap: 28px;
  padding: 24px 4px;
  border-bottom: 1px solid var(--line);
}

.directory-row h3 {
  margin: 0;
  font-size: 1.06rem;
}

.directory-row p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.directory-row a {
  color: var(--forest);
  font-weight: 800;
  text-decoration: none;
}

.directory-row a:hover {
  text-decoration: underline;
}

.page-hero {
  padding: clamp(62px, 9vw, 108px) 0 56px;
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  font-size: clamp(2.6rem, 6.2vw, 4.8rem);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.65fr);
  align-items: end;
  gap: 48px;
}

.page-summary {
  margin: 0;
  padding: 24px 0 4px 28px;
  color: var(--muted);
  border-left: 3px solid var(--orange);
  font-size: 1.08rem;
}

.category-home {
  margin: 18px 0 0 28px;
}

.breadcrumb {
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.breadcrumb a {
  color: var(--forest);
  text-decoration: none;
}

.project-stack {
  display: grid;
  gap: 28px;
}

.project-card {
  display: grid;
  grid-template-columns: minmax(200px, 0.5fr) minmax(0, 1.5fr);
  gap: clamp(28px, 5vw, 70px);
  padding: clamp(28px, 5vw, 54px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.project-index {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 40px;
}

.project-index span {
  color: var(--orange);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.13em;
}

.project-index strong {
  color: var(--forest);
  font-size: clamp(3.5rem, 8vw, 7rem);
  font-weight: 500;
  line-height: 0.8;
  letter-spacing: -0.08em;
}

.project-content h2 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3.1rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.project-lead {
  max-width: 700px;
  margin: 16px 0 24px;
  color: var(--muted);
  font-size: 1.03rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: 6px 10px;
  color: var(--forest-dark);
  background: var(--mint);
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 750;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 28px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  position: relative;
  padding-left: 19px;
  color: var(--muted);
  font-size: 0.92rem;
}

.feature-list li::before {
  content: "";
  position: absolute;
  top: 0.67em;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--orange);
  border-radius: 50%;
}

.use-case-grid,
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.use-case,
.article-card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.use-case span,
.article-card span {
  color: var(--orange);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.use-case h3,
.article-card h3 {
  margin: 28px 0 10px;
  font-size: 1.25rem;
  line-height: 1.25;
}

.use-case p,
.article-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.article-card {
  display: flex;
  flex-direction: column;
  min-height: 280px;
}

.article-card .button-quiet {
  align-self: flex-start;
  margin-top: auto;
}

.next-categories {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.next-categories a {
  min-height: 150px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  text-decoration: none;
}

.next-categories a:hover {
  border-color: var(--forest);
}

.next-categories small {
  color: var(--muted);
  font-weight: 700;
}

.next-categories strong {
  font-size: 1.1rem;
}

.site-footer {
  padding: 42px 0;
  color: rgba(255, 255, 255, 0.72);
  background: #0a251c;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 30px;
}

.site-footer strong {
  display: block;
  color: white;
  font-size: 1.2rem;
}

.site-footer p {
  max-width: 570px;
  margin: 8px 0 0;
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
}

.footer-links a:hover {
  color: white;
}

@media (max-width: 900px) {
  .nav-shell {
    padding: 12px 0;
    align-items: flex-start;
  }

  .site-nav {
    max-width: 430px;
  }

  .hero-grid,
  .page-hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    min-height: 390px;
  }

  .principle-grid,
  .use-case-grid,
  .article-grid,
  .next-categories {
    grid-template-columns: repeat(2, 1fr);
  }

  .project-card {
    grid-template-columns: 150px minmax(0, 1fr);
  }
}

@media (max-width: 680px) {
  .site-header {
    position: static;
  }

  .nav-shell {
    display: block;
  }

  .site-nav {
    margin-top: 12px;
    justify-content: flex-start;
    gap: 2px;
  }

  .site-nav a {
    padding: 7px 9px;
    font-size: 0.82rem;
  }

  .hero {
    padding-top: 58px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 2.45rem;
    letter-spacing: -0.052em;
    overflow-wrap: anywhere;
  }

  .hero h1 {
    font-size: 2.6rem;
  }

  .stats,
  .category-grid,
  .principle-grid,
  .use-case-grid,
  .article-grid,
  .next-categories {
    grid-template-columns: 1fr;
  }

  .category-card {
    min-height: 310px;
  }

  .directory-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .project-card {
    grid-template-columns: 1fr;
  }

  .project-index {
    flex-direction: row;
    align-items: center;
  }

  .project-index strong {
    font-size: 3.8rem;
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}

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