/* asto.cc — 差异一元论理论展示站 */
/* 品牌规范：黑白灰、临床感、精确到冷酷 */

:root {
  --bg: #0d0d0d;
  --fg: #f0f0f0;
  --accent: #c8f542;
  --muted: #888;
  --card-bg: #161616;
  --border: #2a2a2a;
  --font: 'Georgia', 'Noto Serif SC', 'Times New Roman', serif;
  --max-width: 960px;
  --content-width: 720px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.15s;
}
a:hover { opacity: 0.8; }

/* ─── Nav ─── */
nav {
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.2rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.nav-logo {
  color: var(--fg);
  font-size: 1.1rem;
  letter-spacing: 0.05em;
}
.nav-links {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  font-size: 0.9rem;
}
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--accent); }
.nav-sep { color: var(--border); }

/* ─── Main ─── */
main {
  min-height: 80vh;
}

/* ─── Hero ─── */
.hero {
  max-width: var(--content-width);
  margin: 6rem auto;
  padding: 0 2rem;
  text-align: center;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.2;
  margin-bottom: 0.5rem;
}
.hero-en {
  font-size: 1.1rem;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 2rem;
}
.hero-tagline {
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
  line-height: 1.9;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* ─── Buttons ─── */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--font);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  cursor: pointer;
}
.btn:hover {
  background: var(--accent);
  color: var(--bg);
}
.btn-outline {
  border-color: var(--border);
  color: var(--muted);
}
.btn-outline:hover {
  border-color: var(--muted);
  color: var(--fg);
  background: transparent;
}

/* ─── Overview ─── */
.overview {
  max-width: var(--content-width);
  margin: 0 auto 5rem;
  padding: 0 2rem;
  text-align: center;
}
.overview h2 {
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
}
.chain {
  margin-top: 1.5rem;
  font-size: 0.95rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* ─── Reading Paths ─── */
.reading-paths {
  max-width: var(--max-width);
  margin: 0 auto 5rem;
  padding: 0 2rem;
}
.reading-paths h2 {
  text-align: center;
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 2rem;
}
.paths-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.path-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 2rem;
}
.path-label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.path-target {
  display: block;
  font-size: 1.8rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.path-card p {
  font-size: 0.95rem;
  color: #ccc;
}

/* ─── Layers Grid ─── */
.layers {
  max-width: var(--max-width);
  margin: 0 auto 6rem;
  padding: 0 2rem;
}
.layers h2 {
  text-align: center;
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 2rem;
}
.layers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}
.layer-card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 1.5rem;
  color: var(--fg);
}
.layer-card:hover {
  border-color: var(--accent);
  opacity: 1;
}
.layer-pos {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.layer-slug {
  display: block;
  font-size: 1.8rem;
  color: var(--accent);
  margin-bottom: 0.2rem;
}
.layer-title-en {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.8rem;
}
.layer-one-liner {
  font-size: 0.9rem;
  color: #ccc;
  margin-bottom: 0.5rem;
}
.layer-doi {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
}

/* ─── Layer Detail Page ─── */
.layer-page, .about-page, .walkthrough-page {
  max-width: var(--content-width);
  margin: 4rem auto;
  padding: 0 2rem;
}
.back-link {
  display: inline-block;
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 2rem;
}
.layer-identity {
  margin-bottom: 1.5rem;
}
.layer-header .layer-pos {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
}
.layer-header h1 {
  font-size: 2.2rem;
  line-height: 1.2;
  margin-bottom: 0.3rem;
}
.layer-en {
  font-size: 1.05rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.layer-header .layer-one-liner {
  font-size: 1rem;
  color: var(--muted);
}
.zenodo-badge {
  margin-bottom: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}
.zenodo-badge a {
  font-size: 0.9rem;
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  color: var(--muted);
}
.zenodo-badge a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Layer sections */
.layer-page section,
.about-page section,
.walkthrough-page section {
  margin-bottom: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}
.layer-page section:last-of-type,
.about-page section:last-of-type {
  border-bottom: none;
}

.layer-page h2,
.about-page h2,
.walkthrough-page h2 {
  font-size: 1.3rem;
  color: var(--accent);
  margin-bottom: 1rem;
}
.layer-concepts ul {
  list-style: none;
  padding: 0;
}
.layer-concepts li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  border-bottom: 1px solid var(--border);
  color: #ccc;
}
.layer-concepts li::before {
  content: "→";
  color: var(--accent);
  margin-left: -1.5rem;
  margin-right: 0.5rem;
}

.relations-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.relation-label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
}
.relation a {
  font-size: 1.2rem;
  margin-right: 0.5rem;
}
.muted { color: var(--muted); }

/* Layer body (rendered markdown) */
.layer-body h1, .layer-body h2, .layer-body h3,
.walkthrough-body h1, .walkthrough-body h2, .walkthrough-body h3 {
  color: var(--fg);
  margin-top: 2rem;
  margin-bottom: 0.8rem;
}
.layer-body h1, .walkthrough-body h1 { font-size: 1.6rem; }
.layer-body h2, .walkthrough-body h2 { font-size: 1.3rem; color: var(--accent); }
.layer-body h3, .walkthrough-body h3 { font-size: 1.1rem; }
.layer-body p, .walkthrough-body p,
.layer-body li, .walkthrough-body li {
  color: #ccc;
  margin-bottom: 0.8rem;
}
.layer-body ul, .layer-body ol,
.walkthrough-body ul, .walkthrough-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}
.layer-body blockquote,
.walkthrough-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1.2rem;
  color: var(--muted);
  font-style: italic;
  margin-bottom: 1rem;
}
.layer-body code, .walkthrough-body code {
  background: var(--card-bg);
  padding: 0.15rem 0.4rem;
  font-size: 0.9rem;
}
.layer-body pre, .walkthrough-body pre {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 1rem;
}
.layer-body pre code, .walkthrough-body pre code {
  background: none;
  padding: 0;
}
.layer-body table, .walkthrough-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
}
.layer-body th, .layer-body td,
.walkthrough-body th, .walkthrough-body td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.8rem;
  text-align: left;
}
.layer-body th, .walkthrough-body th {
  background: var(--card-bg);
  color: var(--accent);
}

/* Layer nav (prev/next) */
.layer-nav {
  display: flex;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.layer-nav a {
  color: var(--muted);
  font-size: 0.95rem;
}
.layer-nav a:hover { color: var(--accent); }

/* ─── Walkthrough nav ─── */
.walkthrough-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}
.wt-layer-link {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}
.wt-layer-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.wt-pos {
  color: var(--muted);
  margin-right: 0.3rem;
  font-size: 0.75rem;
}

/* ─── About page ─── */
.sites-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.site-card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 1.5rem;
  color: var(--fg);
}
.site-card:hover { border-color: var(--accent); }
.site-card strong { color: var(--accent); }
.site-card p { color: var(--muted); font-size: 0.9rem; margin-top: 0.3rem; }

/* ─── Footer ─── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  margin-top: 4rem;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}
.footer-stats {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.footer-links {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  font-size: 0.85rem;
}

/* ─── Responsive ─── */
@media (max-width: 600px) {
  .nav-inner { padding: 1rem; }
  .nav-links { gap: 0.4rem; font-size: 0.8rem; }
  .hero { margin: 3rem auto; }
  .hero h1 { font-size: 2rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .paths-grid { grid-template-columns: 1fr; }
  .layers-grid { grid-template-columns: 1fr; }
  .relations-grid { grid-template-columns: 1fr; }
  .sites-grid { grid-template-columns: 1fr; }
  .layer-page, .about-page, .walkthrough-page {
    margin: 2rem auto;
  }
}