:root {
  --paper: #f4f1e9;
  --surface: #fbfaf6;
  --ink: #17213b;
  --muted: #687080;
  --indigo: #16254a;
  --indigo-deep: #0e1831;
  --mist: #a9b7d1;
  --violet: #777395;
  --gold: #bd9650;
  --gold-soft: #ece1c4;
  --sage: #647c69;
  --sage-soft: #e5ece4;
  --peach: #c47e5d;
  --peach-soft: #f3e2d5;
  --line: rgba(32, 48, 79, 0.14);
  --shadow: 0 24px 64px rgba(22, 37, 74, 0.12);
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 88% 7%, rgba(199, 172, 111, 0.2), transparent 25rem),
    radial-gradient(circle at 7% 34%, rgba(153, 169, 202, 0.2), transparent 29rem),
    linear-gradient(145deg, rgba(255, 255, 255, 0.38), transparent 42%),
    var(--paper);
  color: var(--ink);
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  min-height: 100vh;
}

body::before {
  content: none;
}

a { color: inherit; }

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(189, 150, 80, 0.48);
  outline-offset: 4px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 20;
  padding: 0.7rem 1rem;
  border-radius: 0.7rem;
  background: var(--ink);
  color: white;
}

.skip-link:focus { top: 1rem; }

.site-header {
  width: min(1160px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.35rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
}

.header-actions {
  min-width: 0;
  margin-left: auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.65rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--indigo-deep);
  font-family: Georgia, "Noto Serif SC", "Songti SC", serif;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand > span:last-child {
  max-width: 20rem;
  line-height: 1.25;
}

.brand-mark {
  width: 2.35rem;
  height: 2.35rem;
  display: grid;
  place-items: center;
  border: 1px solid rgba(189, 150, 80, 0.72);
  border-radius: 50%;
  background: var(--indigo);
  color: #f2d99a;
  font-family: Georgia, serif;
  font-size: 1.2rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.3rem;
}

.site-nav a {
  padding: 0.45rem 0.72rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: rgba(255, 255, 255, 0.62);
  color: var(--indigo);
}

.lang-switch {
  flex: 0 0 auto;
  min-width: 2.65rem;
  padding: 0.42rem 0.65rem;
  border: 1px solid rgba(189, 150, 80, 0.5);
  border-radius: 999px;
  color: var(--indigo);
  font-size: 0.8rem;
  font-weight: 760;
  text-align: center;
  text-decoration: none;
}
.lang-switch:hover { background: var(--gold-soft); }

main,
.site-footer {
  width: min(1160px, calc(100% - 2rem));
  margin-inline: auto;
}

.hero {
  position: relative;
  isolation: isolate;
  min-height: 38rem;
  padding: clamp(4rem, 9vw, 8rem) 0 5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(17rem, 0.65fr);
  align-items: center;
  gap: clamp(2rem, 7vw, 6rem);
}

.hero::before {
  content: "";
  position: absolute;
  width: min(56vw, 38rem);
  aspect-ratio: 1;
  right: -12vw;
  top: 2rem;
  z-index: -1;
  border: 1px solid rgba(189, 150, 80, 0.24);
  border-radius: 50%;
  background:
    radial-gradient(circle at 36% 38%, rgba(248, 240, 216, 0.8), transparent 24%),
    radial-gradient(circle at 62% 62%, rgba(124, 126, 164, 0.23), transparent 54%);
}

.hero::after {
  content: none;
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--gold);
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  margin-bottom: 1.25rem;
  font-family: Georgia, "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(2.75rem, 7vw, 5.7rem);
  color: var(--indigo-deep);
  font-weight: 590;
  line-height: 1.06;
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(1.7rem, 4vw, 2.55rem);
  line-height: 1.24;
}

h3 { line-height: 1.35; }

.lead {
  max-width: 44rem;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.24rem);
}

.hero-note {
  position: relative;
  overflow: hidden;
  padding: 2.4rem;
  border: 1px solid rgba(211, 188, 132, 0.32);
  border-radius: 1.4rem 1.4rem 4rem 0.4rem;
  background: linear-gradient(145deg, var(--indigo-deep), #27345a 68%, #424368);
  color: #f8f5ed;
  box-shadow: var(--shadow);
}

.hero-note::before {
  content: "“";
  position: absolute;
  top: -1.65rem;
  left: 1rem;
  color: #e3c47f;
  font: 5rem Georgia, serif;
}

.hero-note p { margin: 0; font-family: Georgia, "Noto Serif SC", serif; font-size: 1.22rem; line-height: 1.9; }
.hero-note small { display: block; margin-top: 1.2rem; color: #bec8dd; }

.section { padding: 4rem 0; }
.section-head { max-width: 45rem; margin-bottom: 2rem; }
.section-head p { color: var(--muted); }

.category-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
}

.category-card {
  --card-accent: var(--indigo);
  grid-column: span 4;
  min-height: 15rem;
  padding: 1.7rem;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  overflow: hidden;
  background: rgba(251, 250, 246, 0.82);
  box-shadow: 0 12px 34px rgba(22, 37, 74, 0.06);
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.category-card::before { content: none; }
.category-card:hover { transform: translateY(-5px); border-color: rgba(189, 150, 80, 0.44); box-shadow: var(--shadow); }
.category-card.music { --card-accent: #263a68; }
.category-card.psychology { --card-accent: #697f89; }
.category-card.relationships { --card-accent: #8b6e82; }
.category-card.values { --card-accent: #a48245; }
.category-card.physics { --card-accent: #415a7c; }
.category-card.ai { --card-accent: #5b6388; }
.category-card.novel { --card-accent: #7d5062; grid-column: span 12; min-height: 10rem; }

.card-symbol {
  width: 3.1rem;
  height: 3.1rem;
  margin-bottom: 2rem;
  display: grid;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--card-accent) 30%, transparent);
  border-radius: 50%;
  background: color-mix(in srgb, var(--card-accent) 13%, white);
  color: var(--card-accent);
  font-weight: 780;
}

.category-card h3 { margin-bottom: 0.45rem; font-size: 1.35rem; }
.category-card p { margin-bottom: 1.5rem; color: var(--muted); font-size: 0.94rem; }
.card-link { margin-top: auto; color: var(--card-accent); font-size: 0.9rem; font-weight: 720; }

.portal-hero { min-height: 34rem; }
.portal-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.portal-card {
  position: relative;
  min-height: 14rem;
  padding: clamp(1.5rem, 4vw, 2.2rem);
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 1.3rem;
  background: linear-gradient(145deg, rgba(251,250,246,.88), rgba(231,236,240,.72));
  box-shadow: 0 14px 38px rgba(22,37,74,.07);
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.portal-card:nth-child(2) { background: linear-gradient(145deg, rgba(251,250,246,.9), rgba(229,236,228,.78)); }
.portal-card:nth-child(3) { background: linear-gradient(145deg, rgba(251,250,246,.9), rgba(240,226,218,.76)); }
.portal-card:nth-child(4) { background: linear-gradient(145deg, rgba(251,250,246,.9), rgba(226,226,239,.76)); }
.portal-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.portal-card h2 { margin-bottom: 0.6rem; color: var(--indigo-deep); }
.portal-card p:not(.eyebrow) { max-width: 34rem; margin-bottom: 1.2rem; color: var(--muted); }
.portal-card > span { margin-top: auto; color: var(--gold); font-size: 1.35rem; }

.feature {
  padding: clamp(2rem, 6vw, 4rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(17rem, 0.72fr);
  gap: 2.5rem;
  align-items: center;
  border: 1px solid rgba(153, 124, 88, 0.16);
  border-radius: 1.6rem 1.6rem 4.5rem 1.6rem;
  background: linear-gradient(135deg, #f5e7da 0%, #edf1e8 58%, #e2e9e4 100%);
  box-shadow: 0 22px 54px rgba(75, 82, 67, 0.1);
}

.feature p { color: #657267; }

.button-row { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.6rem; }

.button {
  min-height: 3rem;
  padding: 0.72rem 1.15rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--indigo);
  border-radius: 0.8rem;
  background: var(--indigo);
  color: white;
  font-weight: 730;
  text-decoration: none;
}

.button:hover { background: var(--indigo-deep); }
.button.secondary { background: transparent; color: var(--indigo); }
.button.download { min-height: 3.5rem; padding-inline: 1.5rem; }

.notebook-mini {
  max-width: 22rem;
  margin-inline: auto;
  padding: 1.6rem;
  border: 1px solid #d9c9b7;
  border-radius: 0.75rem;
  background: #fffaf0;
  box-shadow: 0.65rem 0.7rem 0 #c9d8c9;
}

.notebook-mini strong { display: block; margin-bottom: 1.1rem; }
.score-line { margin-bottom: 1.2rem; font-size: 1.25rem; font-weight: 760; }
.score-before { color: var(--peach); }
.score-after { color: var(--sage); }
.score-arrow { padding: 0 0.45rem; color: var(--muted); font-weight: 400; }
.note-line { display: none; }

.breadcrumb {
  padding-top: 2rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.breadcrumb a { color: var(--sage); text-decoration: none; }
.breadcrumb span { padding: 0 0.45rem; }

.page-hero {
  padding: clamp(3.5rem, 8vw, 6.5rem) 0 3rem;
  max-width: 52rem;
  border-bottom: 1px solid var(--line);
}
.page-hero h1 { font-size: clamp(2.6rem, 6vw, 4.8rem); }

.topic-list { display: grid; gap: 1rem; }
.topic-card {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.2rem;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(251, 250, 246, 0.82);
  text-decoration: none;
}
.topic-card:hover { border-color: rgba(189, 150, 80, 0.52); }
.topic-number { color: var(--gold); font-family: Georgia, serif; font-size: 1.5rem; }
.topic-card h2, .topic-card h3 { margin: 0 0 0.2rem; font-size: 1.25rem; }
.topic-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.topic-arrow { color: var(--indigo); font-size: 1.3rem; }
.topic-card.pending { opacity: 0.62; pointer-events: none; }

.post {
  padding: clamp(1.5rem, 4vw, 2.2rem);
  margin-bottom: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  background: rgba(251, 250, 246, 0.82);
}
.post .eyebrow { margin-bottom: 0.5rem; }
.post h2 { margin-bottom: 1rem; }
.post video {
  display: block;
  width: 100%;
  margin-bottom: 1.25rem;
  border-radius: 0.9rem;
  background: #000;
}
.post p { margin-bottom: 0.9rem; }
.post p:last-child { margin-bottom: 0; }
.post .credit { color: var(--muted); font-size: 0.88rem; }

.download-layout {
  padding-bottom: 5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.68fr);
  gap: clamp(2rem, 7vw, 5rem);
  align-items: start;
}

.download-panel {
  padding: 2rem;
  border: 1px solid rgba(114, 135, 118, 0.32);
  border-radius: 1.3rem;
  background: linear-gradient(150deg, rgba(245, 231, 218, 0.9), rgba(232, 239, 231, 0.9));
}
.download-panel h2 { margin-bottom: 0.6rem; font-size: 1.45rem; }
.panel-meta { margin: 1rem 0 1.5rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--line); font-size: 0.9rem; }
.panel-meta p { margin-bottom: 0.55rem; }
.panel-meta a { color: var(--sage); }
.version-meta { margin: 1.1rem 0; color: var(--muted); font-size: 0.9rem; }
.download-version + .download-version { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.download-version h3 { margin: 1.1rem 0 0; font-size: 1.08rem; }
.download-version .version-meta { margin: 0.45rem 0 1rem; }
.hash { margin-top: 1.4rem; overflow-wrap: anywhere; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 0.76rem; line-height: 1.5; color: var(--muted); }

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1rem 0 1.75rem;
}
.detail-box { padding: 1.25rem; border-top: 1px solid var(--line); }
.detail-box strong { display: block; margin-bottom: 0.35rem; }
.detail-box h3 { margin-bottom: 0.4rem; }
.detail-box p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.download-layout > div > h2 { margin-bottom: 0.6rem; }
.download-layout > div > h3 { margin-bottom: 0.35rem; }
.download-layout > div > p { margin-bottom: 0.9rem; }

.steps { padding-left: 1.25rem; }
.steps li { margin-bottom: 0.65rem; padding-left: 0.25rem; }

.author-card {
  padding: clamp(2rem, 6vw, 4rem);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 3.5rem);
  align-items: center;
  border: 1px solid rgba(211, 188, 132, 0.28);
  border-radius: 1.5rem 1.5rem 5rem 1.5rem;
  background: linear-gradient(145deg, var(--indigo-deep), #25365d 62%, #44466b);
  color: #f8f5ed;
  box-shadow: var(--shadow);
}

.author-monogram {
  width: clamp(6.5rem, 14vw, 9rem);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1px solid rgba(231, 202, 137, 0.5);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.07);
  color: #e4c77f;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
}

.author-card h2 { margin-bottom: 0.35rem; color: #fffdf8; }
.author-card .eyebrow { color: #e4c77f; }
.author-role { margin-bottom: 0.85rem; color: #d6cba9; font-weight: 720; }
.author-bio { max-width: 42rem; color: #c8d0df; }
.author-card .button { border-color: #e4c77f; background: #e4c77f; color: var(--indigo-deep); }
.author-card .button.secondary { background: transparent; color: #f2dda5; }

.license-summary {
  padding: clamp(1.5rem, 4vw, 2.4rem);
  border: 1px solid #cddace;
  border-radius: 1.2rem;
  background: linear-gradient(150deg, rgba(245, 231, 218, 0.84), rgba(232, 239, 231, 0.84));
}

.license-summary h2 { font-size: 1.45rem; }
.license-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 1.6rem 0; }
.license-item { padding: 1.2rem; border-radius: 0.9rem; background: rgba(255, 255, 255, 0.62); }
.license-item strong { display: block; margin-bottom: 0.35rem; }
.license-item p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.notice { padding: 1rem 1.2rem; border-left: 3px solid var(--peach); background: var(--peach-soft); color: var(--muted); }

.relativity-hero {
  max-width: none;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(18rem, 0.85fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}

.question-card {
  padding: clamp(1.6rem, 4vw, 2.4rem);
  border: 1px solid rgba(189, 150, 80, 0.34);
  border-radius: 1.2rem 1.2rem 3.4rem 1.2rem;
  background: linear-gradient(145deg, var(--indigo-deep), #28385f 72%, #4b4d72);
  color: #f8f5ed;
  box-shadow: var(--shadow);
}

.question-card .eyebrow { color: #e7cb8b; }
.question-card p { margin-bottom: 1.5rem; color: #d8deea; font-size: 1.08rem; }
.question-card strong { display: block; color: #fffdf7; font: 600 clamp(1.8rem, 4vw, 3rem)/1.2 Georgia, "Noto Serif SC", serif; }
.question-card small { display: block; margin-top: 0.6rem; color: #bdc7da; }

.formula-grid,
.concept-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.formula-card,
.concept-card {
  padding: 1.45rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(251, 250, 246, 0.82);
}

.formula-card h3,
.concept-card h3 { margin-bottom: 0.65rem; }
.formula-card p,
.concept-card p { margin-bottom: 0; color: var(--muted); }
.equation { color: var(--indigo-deep); font: 600 clamp(1.4rem, 3vw, 2rem)/1.4 Georgia, "Times New Roman", serif; letter-spacing: 0.02em; }

.calculation-panel {
  margin-top: 1.5rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-left: 4px solid var(--gold);
  border-radius: 0 1.2rem 1.2rem 0;
  background: rgba(255, 255, 255, 0.54);
}
.calculation-panel p:last-child { margin-bottom: 0; }

.calculator {
  padding: clamp(1.5rem, 4vw, 2.6rem);
  border: 1px solid rgba(100, 124, 105, 0.28);
  border-radius: 1.3rem;
  background: linear-gradient(145deg, rgba(244, 237, 219, 0.9), rgba(225, 234, 231, 0.9));
}
.calculator-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(12rem, 0.8fr); gap: 1.5rem; }
.calculator label { display: block; margin-bottom: 0.55rem; font-weight: 720; }
.calculator input[type="range"] { width: 100%; accent-color: var(--gold); }
.calculator input[type="number"] { width: 100%; min-height: 2.8rem; padding: 0.55rem 0.7rem; border: 1px solid var(--line); border-radius: 0.65rem; background: rgba(255,255,255,.7); color: var(--ink); font: inherit; }
.calculator-output { margin-top: 1.5rem; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.metric { padding: 1.25rem; border-radius: 0.9rem; background: rgba(255,255,255,.62); }
.metric span { display: block; color: var(--muted); font-size: 0.85rem; }
.metric strong { display: block; margin-top: 0.2rem; color: var(--indigo-deep); font: 600 clamp(1.5rem, 3vw, 2.2rem)/1.2 Georgia, serif; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 1rem; background: rgba(251,250,246,.78); }
.relativity-table { width: 100%; border-collapse: collapse; min-width: 36rem; }
.relativity-table th,
.relativity-table td { padding: 0.95rem 1rem; text-align: left; border-bottom: 1px solid var(--line); }
.relativity-table th { color: var(--indigo-deep); background: rgba(169,183,209,.16); }
.relativity-table tr:last-child td { border-bottom: 0; }

.reference-note { padding: 1.4rem 1.6rem; border-radius: 1rem; background: var(--gold-soft); color: #4f4b43; }
.source-list li { margin-bottom: 0.65rem; }
.source-list a { color: var(--indigo); }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}
.stat-card {
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(251, 250, 246, 0.82);
}
.stat-card strong { display: block; color: var(--indigo-deep); font: 600 clamp(1.8rem, 4vw, 2.7rem)/1.1 Georgia, serif; }
.stat-card span { display: block; margin-top: 0.45rem; color: var(--muted); font-size: 0.9rem; }

.memory-grid,
.nvc-steps,
.practice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.memory-card,
.nvc-step,
.practice-card {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(251, 250, 246, 0.82);
}
.memory-card h3,
.nvc-step h3,
.practice-card h3 { margin-bottom: 0.55rem; }
.memory-card p,
.nvc-step p,
.practice-card p { margin-bottom: 0; color: var(--muted); }
.memory-meta { margin-bottom: 0.65rem; color: var(--gold); font-size: 0.82rem; font-weight: 730; letter-spacing: 0.08em; }

.filter-panel {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.48);
}
.filter-row { display: flex; flex-wrap: wrap; gap: 0.55rem; align-items: center; }
.catalog-search {
  width: min(100%, 24rem);
  min-height: 2.8rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: rgba(255,255,255,.76);
  color: var(--ink);
  font: inherit;
}
.filter-button {
  min-height: 2.5rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.55);
  color: var(--muted);
  cursor: pointer;
  font: inherit;
}
.filter-button[aria-pressed="true"] { border-color: rgba(189,150,80,.52); background: var(--gold-soft); color: var(--indigo-deep); }
.catalog-count { margin: 0.9rem 0 0; color: var(--muted); font-size: 0.88rem; }
.catalog-grid { margin-top: 1rem; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.8rem; }
.script-card { padding: 1.15rem; border: 1px solid var(--line); border-radius: 0.9rem; background: rgba(251,250,246,.8); }
.script-card h3 { margin-bottom: 0.35rem; font-size: 1.05rem; }
.script-meta { margin-bottom: 0.7rem; color: var(--muted); font-size: 0.8rem; }
.script-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.script-tag { padding: 0.18rem 0.5rem; border-radius: 999px; background: rgba(169,183,209,.2); color: var(--indigo); font-size: 0.75rem; }
.score-pair { margin-top: 0.8rem; font-size: 0.86rem; }
.score-pair strong { color: var(--sage); }
.privacy-note { margin-top: 1.25rem; padding: 1rem 1.2rem; border-left: 3px solid var(--sage); background: var(--sage-soft); color: #536257; }

.nvc-step { position: relative; padding-left: 4.2rem; }
.nvc-number { position: absolute; left: 1.35rem; top: 1.35rem; color: var(--gold); font: 600 1.7rem Georgia, serif; }
.language-shift { display: grid; grid-template-columns: 1fr auto 1fr; gap: 1rem; align-items: stretch; }
.language-box { padding: 1.5rem; border-radius: 1rem; background: rgba(251,250,246,.8); border: 1px solid var(--line); }
.language-box.before { border-left: 4px solid var(--peach); }
.language-box.after { border-left: 4px solid var(--sage); }
.language-box p:last-child { margin-bottom: 0; }
.shift-arrow { align-self: center; color: var(--gold); font-size: 1.7rem; }
.source-note { margin-top: 2rem; color: var(--muted); font-size: 0.88rem; }

.site-footer {
  margin-top: 3rem;
  padding: 2.5rem 0 3rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.85rem;
}
.site-footer p { margin: 0; }

/* Use color, spacing and soft surfaces instead of ornamental horizontal or vertical lines. */
hr { display: none; }
.site-header,
.hero-note,
.category-card,
.portal-card,
.feature,
.notebook-mini,
.page-hero,
.topic-card,
.download-panel,
.detail-box,
.author-card,
.license-summary,
.notice,
.question-card,
.formula-card,
.concept-card,
.calculation-panel,
.calculator,
.table-wrap,
.relativity-table th,
.relativity-table td,
.stat-card,
.memory-card,
.nvc-step,
.practice-card,
.filter-panel,
.script-card,
.privacy-note,
.language-box,
.site-footer {
  border: 0;
}
.lang-switch,
.button,
.catalog-search,
.filter-button,
.calculator input[type="number"] {
  border: 0;
}
.lang-switch,
.button.secondary,
.filter-button,
.catalog-search,
.calculator input[type="number"] {
  background: rgba(255, 255, 255, 0.66);
}
.hero::before,
.brand-mark,
.card-symbol,
.author-monogram {
  border: 0;
}
.relativity-table {
  border-collapse: separate;
  border-spacing: 0 0.35rem;
}
.relativity-table td,
.relativity-table th {
  background-clip: padding-box;
}

@media (max-width: 780px) {
  .site-header { align-items: flex-start; flex-wrap: wrap; }
  .header-actions { width: 100%; margin-left: 0; align-items: center; }
  .site-nav { min-width: 0; flex: 1 1 auto; flex-wrap: nowrap; justify-content: flex-start; overflow-x: auto; scrollbar-width: none; }
  .site-nav::-webkit-scrollbar { display: none; }
  .site-nav a { flex: 0 0 auto; }
  .hero, .feature, .download-layout, .relativity-hero { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 4rem; }
  .hero::before { width: 34rem; right: -22rem; top: 3rem; }
  .hero::after { left: 38%; opacity: 0.22; }
  .hero-note { max-width: 28rem; }
  .category-card { grid-column: span 12; min-height: 12rem; }
  .topic-card { grid-template-columns: auto 1fr; }
  .topic-arrow { display: none; }
  .detail-grid { grid-template-columns: 1fr; }
  .author-card { grid-template-columns: 1fr; }
  .license-grid { grid-template-columns: 1fr; }
  .formula-grid, .concept-grid, .calculator-grid, .stat-grid, .memory-grid, .nvc-steps, .practice-grid, .catalog-grid, .portal-grid { grid-template-columns: 1fr; }
  .language-shift { grid-template-columns: 1fr; }
  .shift-arrow { justify-self: center; transform: rotate(90deg); }
  .site-footer { flex-direction: column; }
}

@media (max-width: 480px) {
  .brand { font-size: 0.88rem; letter-spacing: 0.035em; }
  .brand-mark { width: 2rem; height: 2rem; flex: 0 0 2rem; }
  .calculator-output { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .category-card { transition: none; }
}