:root {
  --bg: #0a0a0b;
  --bg-elev: #121214;
  --bg-elev-2: #1a1a1e;
  --border: #26262c;
  --fg: #e8e8ea;
  --fg-dim: #8a8a92;
  --fg-mute: #5a5a62;
  --accent: #c8ff3c;
  --accent-2: #f05d23;
  --product: #6ea8ff;
  --founder: #ff6ec7;
  --vc: #ffd24d;
  --company: #c8ff3c;
  --person: #ff6ec7;
  --vc-firm: #ffd24d;
  --danger: #ff4d4d;
  --mono: "JetBrains Mono", "SF Mono", "Menlo", "Consolas", "PingFang SC", monospace;
  --sans: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #fff; }

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.nav-brand {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--fg);
}
.nav-brand .rip { color: var(--accent); }
.nav-links { display: flex; gap: 22px; font-family: var(--mono); font-size: 13px; }
.nav-links a { color: var(--fg-dim); }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

.container { max-width: 1240px; margin: 0 auto; padding: 0 28px; }

/* ========== HOME ========== */
.hero {
  min-height: calc(100vh - 56px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 60px 0 80px;
}
.hero-tag {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 28px;
  text-transform: uppercase;
  border: 1px solid var(--accent);
  padding: 6px 12px;
}
.hero h1 {
  font-size: clamp(56px, 11vw, 148px);
  line-height: 0.95;
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 28px;
}
.hero h1 .zh { color: var(--accent); }
.hero h1 .en {
  display: block;
  font-size: 0.38em;
  font-weight: 500;
  color: var(--fg-dim);
  letter-spacing: 0.04em;
  margin-top: 8px;
}
.hero-desc {
  max-width: 680px;
  font-size: 17px;
  color: var(--fg-dim);
  margin-bottom: 44px;
  line-height: 1.8;
}
.hero-desc strong { color: var(--fg); }

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  margin-bottom: 44px;
  width: 100%;
  max-width: 720px;
}
.stat {
  padding: 24px 28px;
  border-right: 1px solid var(--border);
}
.stat:last-child { border-right: none; }
.stat-num {
  font-family: var(--mono);
  font-size: 38px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label { font-size: 12px; color: var(--fg-mute); letter-spacing: 0.1em; text-transform: uppercase; font-family: var(--mono); }

.cta-row { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  font-family: var(--mono);
  font-size: 13px;
  padding: 14px 26px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #0a0a0b;
  font-weight: 700;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all .15s;
  display: inline-block;
}
.btn:hover { background: transparent; color: var(--accent); }
.btn.ghost { background: transparent; color: var(--fg); border-color: var(--border); }
.btn.ghost:hover { color: var(--accent); border-color: var(--accent); }

.manifesto {
  border-top: 1px solid var(--border);
  padding: 80px 0;
}
.manifesto h2 {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.25em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 28px;
}
.manifesto p { max-width: 720px; font-size: 17px; color: var(--fg-dim); margin-bottom: 18px; }
.manifesto p strong { color: var(--fg); }

.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ========== GRAPH ========== */
.page-title {
  padding: 48px 0 24px;
}
.page-title h1 {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.page-title p { color: var(--fg-dim); margin-top: 8px; font-size: 14px; font-family: var(--mono); }

.graph-wrap {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 20px;
  margin-bottom: 40px;
}
@media (max-width: 960px) { .graph-wrap { grid-template-columns: 1fr; } }

.canvas-box {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  position: relative;
  height: 640px;
  overflow: hidden;
}
#graph-canvas { width: 100%; height: 100%; display: block; cursor: grab; }
#graph-canvas:active { cursor: grabbing; }

.graph-legend {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(10,10,11,.8);
  border: 1px solid var(--border);
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 11px;
  z-index: 5;
}
.legend-item { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.legend-item:last-child { margin-bottom: 0; }
.legend-dot { width: 10px; height: 10px; border-radius: 50%; }

.graph-controls {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  gap: 6px;
  z-index: 5;
}
.ctrl-btn {
  background: rgba(10,10,11,.8);
  border: 1px solid var(--border);
  color: var(--fg);
  width: 32px; height: 32px;
  font-family: var(--mono);
  font-size: 14px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.ctrl-btn:hover { border-color: var(--accent); color: var(--accent); }

.search-box {
  position: absolute;
  bottom: 12px;
  left: 12px;
  right: 12px;
  z-index: 5;
}
.search-box input {
  width: 100%;
  padding: 10px 14px;
  background: rgba(10,10,11,.9);
  border: 1px solid var(--border);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 13px;
  outline: none;
}
.search-box input:focus { border-color: var(--accent); }
.search-results {
  position: absolute;
  bottom: 44px;
  left: 0; right: 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  max-height: 240px;
  overflow-y: auto;
  display: none;
}
.search-results.show { display: block; }
.search-result {
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; gap: 8px;
}
.search-result:hover { background: var(--bg-elev-2); color: var(--accent); }
.search-result .type { color: var(--fg-mute); font-family: var(--mono); font-size: 11px; }

.node-detail {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 22px;
  overflow-y: auto;
  max-height: 640px;
}
.node-detail.empty { color: var(--fg-mute); font-family: var(--mono); font-size: 12px; display: flex; align-items: center; justify-content: center; text-align: center; }
.node-detail h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 4px;
  word-break: break-word;
}
.node-detail .type-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  padding: 2px 8px;
  border: 1px solid currentColor;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.node-detail .desc { color: var(--fg-dim); font-size: 13px; margin-bottom: 16px; line-height: 1.7; }
.node-detail .meta { font-family: var(--mono); font-size: 11px; color: var(--fg-mute); margin-bottom: 16px; display: flex; gap: 16px; flex-wrap: wrap; }
.node-detail .meta span strong { color: var(--fg); }
.node-detail h4 { font-family: var(--mono); font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--fg-mute); margin-bottom: 8px; margin-top: 18px; }
.related-list { list-style: none; }
.related-list li {
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 13px;
  cursor: pointer;
  display: flex; justify-content: space-between; gap: 8px;
}
.related-list li:hover { color: var(--accent); }
.related-list .rel-type { color: var(--fg-mute); font-family: var(--mono); font-size: 10px; }
.article-refs { list-style: none; }
.article-refs li { padding: 6px 0; font-size: 13px; border-bottom: 1px dashed var(--border); }
.article-refs a { color: var(--fg); }
.article-refs a:hover { color: var(--accent); }

/* ========== LEADERBOARDS ========== */
.boards { margin-bottom: 60px; }
.boards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.board {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 22px;
}
.board h3 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.board h3 .dot { width: 8px; height: 8px; border-radius: 50%; }
.board ol { list-style: none; counter-reset: rank; }
.board li {
  counter-increment: rank;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 13px;
  cursor: pointer;
}
.board li::before {
  content: counter(rank);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-mute);
  min-width: 20px;
}
.board li.top3::before { color: var(--accent); font-weight: 700; }
.board li:hover { color: var(--accent); }
.board .name { flex: 1; }
.board .score { font-family: var(--mono); font-size: 11px; color: var(--fg-mute); }

/* ========== ARTICLES LIST ========== */
.article-list-header {
  padding: 48px 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 20px;
}
.article-list-header h1 { font-size: 42px; font-weight: 800; letter-spacing: -0.02em; }
.article-list-header p { color: var(--fg-dim); font-family: var(--mono); font-size: 13px; margin-top: 8px; }
.article-list-search {
  display: flex; gap: 8px;
}
.article-list-search input {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 13px;
  outline: none;
  min-width: 260px;
}
.article-list-search input:focus { border-color: var(--accent); }
.author-filter { display: flex; gap: 6px; margin-bottom: 24px; flex-wrap: wrap; }
.filter-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 12px;
  padding: 6px 12px;
  cursor: pointer;
  letter-spacing: 0.05em;
}
.filter-btn.active, .filter-btn:hover { border-color: var(--accent); color: var(--accent); }

.articles-table {
  border-top: 1px solid var(--border);
  margin-bottom: 60px;
}
.article-row {
  display: grid;
  grid-template-columns: 90px 1fr 120px 80px;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
  text-decoration: none;
  color: inherit;
  transition: background .15s;
}
.article-row:hover { background: rgba(200, 255, 60, 0.04); }
.article-row:hover .title { color: var(--accent); }
.article-row .num { font-family: var(--mono); font-size: 13px; color: var(--fg-mute); }
.article-row .title { font-size: 17px; font-weight: 600; line-height: 1.4; color: var(--fg); }
.article-row .author { font-family: var(--mono); font-size: 12px; color: var(--fg-dim); }
.article-row .date { font-family: var(--mono); font-size: 12px; color: var(--fg-mute); text-align: right; }
@media (max-width: 720px) {
  .article-row { grid-template-columns: 60px 1fr 70px; }
  .article-row .author { display: none; }
}

/* ========== ARTICLE DETAIL ========== */
.article-nav {
  padding: 28px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  display: flex; gap: 8px; flex-wrap: wrap;
}
.article-nav a { color: var(--fg-dim); }
.article-nav a:hover { color: var(--accent); }

.article-header {
  padding: 40px 0 32px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}
.article-header .num { font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: 0.2em; margin-bottom: 16px; }
.article-header h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
}
.article-meta {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-dim);
  display: flex; gap: 20px; flex-wrap: wrap;
}
.article-meta .author-col { color: var(--fg); }

.article-body {
  max-width: 720px;
  margin: 0 auto;
  padding-bottom: 80px;
  font-size: 16px;
  line-height: 1.9;
  color: #d4d4d8;
  font-family: var(--sans);
}
.article-body h1, .article-body h2, .article-body h3, .article-body h4 {
  color: var(--fg);
  margin: 2em 0 0.8em;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.article-body h1 { font-size: 1.7em; border-bottom: 1px solid var(--border); padding-bottom: 0.3em; }
.article-body h2 { font-size: 1.4em; }
.article-body h3 { font-size: 1.2em; }
.article-body h4 { font-size: 1.05em; }
.article-body p { margin: 1em 0; }
.article-body ul, .article-body ol { margin: 1em 0; padding-left: 1.6em; }
.article-body li { margin: 0.4em 0; }
.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.4em 1.2em;
  margin: 1.4em 0;
  color: var(--fg-dim);
  background: var(--bg-elev);
  font-style: italic;
}
.article-body code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-elev-2);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--accent);
}
.article-body pre {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 16px 20px;
  overflow-x: auto;
  margin: 1.4em 0;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
}
.article-body pre code { background: none; padding: 0; color: var(--fg); }
.article-body hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }
.article-body strong { color: var(--fg); }
.article-body em { color: var(--fg); }
.article-body a { color: var(--accent); border-bottom: 1px dashed var(--accent); }
.article-body img { max-width: 100%; margin: 1em 0; border: 1px solid var(--border); }
.article-body table { border-collapse: collapse; margin: 1.4em 0; width: 100%; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; font-size: 14px; }
.article-body th { background: var(--bg-elev); font-family: var(--mono); font-size: 12px; }

.article-footer-nav {
  max-width: 720px;
  margin: 0 auto;
  padding: 30px 0 60px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-family: var(--mono);
  font-size: 12px;
}
.article-footer-nav a { color: var(--fg-dim); }
.article-footer-nav a:hover { color: var(--accent); }
.article-footer-nav .label { color: var(--fg-mute); display: block; margin-bottom: 4px; }

/* scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); }
::-webkit-scrollbar-thumb:hover { background: var(--fg-mute); }

/* tag pills (used in node detail) */
.tag-list { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 6px; }
.tag {
  font-family: var(--mono);
  font-size: 10px;
  padding: 2px 7px;
  border: 1px solid var(--border);
  color: var(--fg-mute);
  letter-spacing: 0.05em;
}

@media (max-width: 640px) {
  .container { padding: 0 20px; }
  .nav { padding: 12px 20px; }
  .nav-links { gap: 14px; font-size: 12px; }
  .stats { grid-template-columns: 1fr; }
  .stat { border-right: none; border-bottom: 1px solid var(--border); }
  .stat:last-child { border-bottom: none; }
}