/* 葬AI Web4 — Brand Style */
:root {
  --bg: #0a0a0a;
  --bg-elev: #111111;
  --bg-elev2: #181818;
  --fg: #e8e6e3;
  --fg-dim: #9a9590;
  --fg-mute: #6b6762;
  --red: #ff3b30;
  --red-dim: #b7231c;
  --accent: #ff6b35;
  --line: #232323;
  --product: #ff3b30;
  --founder: #3ea6ff;
  --vc: #c084fc;
  --company: #f5c518;
  --radius: 4px;
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
a { color: var(--fg); text-decoration: none; }
a:hover { color: var(--red); }
::selection { background: var(--red); color: #fff; }

/* Layout */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: 1180px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.nav .brand {
  font-family: var(--mono); font-weight: 700; font-size: 18px; letter-spacing: -0.02em;
}
.nav .brand .logo-x { color: var(--red); }
.nav ul { display: flex; gap: 22px; list-style: none; margin: 0; padding: 0; font-size: 14px; }
.nav ul a { color: var(--fg-dim); }
.nav ul a.active, .nav ul a:hover { color: var(--fg); }

.container { max-width: 1180px; margin: 0 auto; padding: 40px 24px 80px; }

/* Hero */
.hero { padding: 80px 0 60px; border-bottom: 1px solid var(--line); margin-bottom: 48px; }
.hero .tag {
  display: inline-block; font-family: var(--mono); font-size: 12px;
  color: var(--red); border: 1px solid var(--red-dim);
  padding: 4px 10px; border-radius: 2px; margin-bottom: 24px;
  letter-spacing: 0.1em; text-transform: uppercase;
}
.hero h1 {
  font-size: 64px; line-height: 1.05; font-weight: 800; margin: 0 0 24px;
  letter-spacing: -0.03em;
}
.hero h1 .slash { color: var(--red); }
.hero .desc { font-size: 18px; color: var(--fg-dim); max-width: 680px; line-height: 1.7; margin-bottom: 40px; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); max-width: 720px; }
.stats .stat { background: var(--bg); padding: 20px 24px; }
.stats .num { font-family: var(--mono); font-size: 32px; font-weight: 700; color: var(--red); }
.stats .label { font-size: 12px; color: var(--fg-mute); text-transform: uppercase; letter-spacing: 0.1em; margin-top: 4px; }

.cta-row { display: flex; gap: 12px; margin-top: 40px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; font-family: var(--mono); font-size: 13px;
  border: 1px solid var(--line); background: var(--bg-elev); color: var(--fg);
  cursor: pointer; transition: all 0.15s; border-radius: 2px;
}
.btn:hover { background: var(--bg-elev2); border-color: var(--fg-mute); color: var(--fg); }
.btn.primary { background: var(--red); border-color: var(--red); color: #000; font-weight: 700; }
.btn.primary:hover { background: #ff5549; color: #000; }

/* Section */
.section { margin-bottom: 64px; }
.section h2 {
  font-size: 28px; font-weight: 700; margin: 0 0 8px; letter-spacing: -0.02em;
  display: flex; align-items: center; gap: 12px;
}
.section h2::before { content: "##"; color: var(--red); font-family: var(--mono); font-size: 22px; font-weight: 400; }
.section .sub { color: var(--fg-mute); font-size: 14px; margin-bottom: 24px; }

/* Article list */
.article-grid { display: grid; grid-template-columns: 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.article-card {
  background: var(--bg); padding: 20px 24px; display: grid;
  grid-template-columns: 80px 1fr auto; gap: 20px; align-items: start;
  transition: background 0.15s; cursor: pointer;
}
.article-card:hover { background: var(--bg-elev); }
.article-card .aid { font-family: var(--mono); font-size: 13px; color: var(--fg-mute); padding-top: 2px; }
.article-card .title { font-size: 17px; font-weight: 600; margin: 0 0 6px; line-height: 1.4; }
.article-card .meta { font-family: var(--mono); font-size: 12px; color: var(--fg-mute); }
.article-card .meta .author { color: var(--red); }
.article-card .excerpt { color: var(--fg-dim); font-size: 13px; margin-top: 8px; line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.article-card .arrow { color: var(--fg-mute); font-family: var(--mono); font-size: 18px; align-self: center; }
.article-card:hover .arrow { color: var(--red); }

/* Toolbar for list/graph */
.toolbar {
  display: flex; gap: 12px; margin-bottom: 24px; flex-wrap: wrap; align-items: center;
}
.search {
  flex: 1; min-width: 240px; padding: 10px 14px; font-family: var(--mono); font-size: 13px;
  background: var(--bg-elev); border: 1px solid var(--line); color: var(--fg);
  border-radius: 2px; outline: none;
}
.search:focus { border-color: var(--red); }
select, .chip {
  padding: 9px 14px; font-family: var(--mono); font-size: 12px;
  background: var(--bg-elev); border: 1px solid var(--line); color: var(--fg-dim);
  border-radius: 2px; cursor: pointer;
}
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip.active { background: var(--red); border-color: var(--red); color: #000; font-weight: 600; }

/* Leaderboard */
.boards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-bottom: 48px; }
.board { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.board h3 {
  margin: 0; padding: 16px 20px; font-size: 14px; font-family: var(--mono);
  text-transform: uppercase; letter-spacing: 0.1em;
  border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 8px;
}
.board h3 .dot { width: 8px; height: 8px; border-radius: 50%; }
.board ul { list-style: none; margin: 0; padding: 0; }
.board li {
  padding: 12px 20px; display: grid; grid-template-columns: 28px 1fr auto; gap: 12px;
  align-items: center; border-bottom: 1px solid var(--line); font-size: 13px;
  cursor: pointer; transition: background 0.12s;
}
.board li:last-child { border-bottom: none; }
.board li:hover { background: var(--bg-elev2); }
.board .rank { font-family: var(--mono); color: var(--fg-mute); font-size: 12px; }
.board .name { font-weight: 600; }
.board .name .desc { display: block; font-weight: 400; color: var(--fg-mute); font-size: 11px; margin-top: 2px; line-height: 1.4; }
.board .w { font-family: var(--mono); font-size: 11px; color: var(--red); }

/* Graph */
.graph-wrap { position: relative; border: 1px solid var(--line); background: #050505; border-radius: var(--radius); overflow: hidden; }
#graph-canvas { width: 100%; height: 680px; display: block; cursor: grab; }
#graph-canvas:active { cursor: grabbing; }
.graph-legend {
  position: absolute; top: 12px; left: 12px; background: rgba(10,10,10,0.8);
  border: 1px solid var(--line); padding: 10px 14px; border-radius: 2px;
  font-family: var(--mono); font-size: 11px;
}
.graph-legend .row { display: flex; align-items: center; gap: 8px; margin: 3px 0; }
.graph-legend .sw { width: 10px; height: 10px; border-radius: 50%; }
.graph-info {
  position: absolute; top: 12px; right: 12px; width: 280px; max-height: calc(100% - 24px); overflow-y: auto;
  background: rgba(10,10,10,0.92); border: 1px solid var(--line); border-radius: 2px;
  padding: 14px; font-size: 12px; display: none;
}
.graph-info.show { display: block; }
.graph-info h4 { margin: 0 0 4px; font-size: 14px; padding-right: 20px; word-break: break-all; }
.graph-info .close { position: absolute; top: 10px; right: 12px; cursor: pointer; color: var(--fg-mute); font-size: 16px; background: none; border: none; color: var(--fg-dim); }
.graph-info .close:hover { color: var(--red); }
.graph-info .type-tag { display: inline-block; font-family: var(--mono); font-size: 10px; padding: 2px 6px; border-radius: 2px; margin-right: 6px; text-transform: uppercase; }
.graph-info .desc { color: var(--fg-dim); margin: 8px 0; line-height: 1.5; }
.graph-info .stats-row { display: flex; gap: 12px; font-family: var(--mono); font-size: 11px; color: var(--fg-mute); margin: 8px 0; border-top: 1px solid var(--line); padding-top: 8px; }
.graph-info .conns { margin-top: 8px; }
.graph-info .conns h5 { margin: 8px 0 4px; font-size: 11px; color: var(--fg-mute); text-transform: uppercase; font-family: var(--mono); }
.graph-info .conns .conn { display: block; padding: 3px 0; font-size: 11px; color: var(--fg-dim); cursor: pointer; border-bottom: 1px dashed var(--line); }
.graph-info .conns .conn:hover { color: var(--red); }
.graph-info .conns .conn .rel { color: var(--fg-mute); font-family: var(--mono); font-size: 10px; margin-right: 4px; }
.graph-tip { position: absolute; bottom: 12px; left: 12px; font-family: var(--mono); font-size: 11px; color: var(--fg-mute); background: rgba(10,10,10,0.7); padding: 6px 10px; border-radius: 2px; border: 1px solid var(--line); }

/* Article detail */
.article-page { max-width: 760px; margin: 0 auto; padding: 60px 24px 80px; }
.article-page .back { font-family: var(--mono); font-size: 12px; color: var(--fg-mute); display: inline-block; margin-bottom: 40px; }
.article-page .back:hover { color: var(--red); }
.article-page h1 { font-size: 36px; line-height: 1.25; margin: 0 0 16px; letter-spacing: -0.02em; font-weight: 800; }
.article-page .meta { font-family: var(--mono); font-size: 13px; color: var(--fg-mute); border-bottom: 1px solid var(--line); padding-bottom: 24px; margin-bottom: 40px; }
.article-page .meta .author { color: var(--red); font-weight: 600; }
.article-body { font-size: 16px; line-height: 1.85; color: var(--fg); }
.article-body h1, .article-body h2, .article-body h3, .article-body h4 { margin: 2em 0 0.6em; letter-spacing: -0.01em; line-height: 1.3; }
.article-body h2 { font-size: 24px; border-bottom: 1px solid var(--line); padding-bottom: 8px; }
.article-body h3 { font-size: 19px; }
.article-body p { margin: 1em 0; }
.article-body a { color: var(--red); border-bottom: 1px solid var(--red-dim); }
.article-body a:hover { color: #ff7a70; }
.article-body strong { color: #fff; font-weight: 700; }
.article-body em { color: var(--accent); font-style: normal; border-bottom: 1px dashed var(--accent); }
.article-body blockquote {
  margin: 1.5em 0; padding: 12px 20px; border-left: 3px solid var(--red);
  background: var(--bg-elev); color: var(--fg-dim); font-style: italic;
}
.article-body ul, .article-body ol { padding-left: 1.5em; margin: 1em 0; }
.article-body li { margin: 0.4em 0; }
.article-body code {
  font-family: var(--mono); background: var(--bg-elev); padding: 2px 6px;
  border-radius: 2px; font-size: 0.9em; color: var(--accent);
}
.article-body pre {
  background: var(--bg-elev); padding: 16px; border-radius: var(--radius);
  overflow-x: auto; border: 1px solid var(--line);
}
.article-body pre code { background: none; color: var(--fg); padding: 0; }
.article-body hr { border: none; border-top: 1px solid var(--line); margin: 2em 0; }
.article-body img { max-width: 100%; border-radius: var(--radius); border: 1px solid var(--line); }
.article-body table { border-collapse: collapse; width: 100%; margin: 1em 0; }
.article-body th, .article-body td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.article-body th { background: var(--bg-elev); font-family: var(--mono); font-weight: 600; }

.article-entities { margin-top: 60px; padding-top: 32px; border-top: 1px solid var(--line); }
.article-entities h3 { font-family: var(--mono); font-size: 13px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--fg-mute); margin: 0 0 16px; }
.article-entities .ent { display: inline-block; margin: 4px 6px 4px 0; padding: 4px 10px; background: var(--bg-elev); border: 1px solid var(--line); font-size: 12px; font-family: var(--mono); border-radius: 2px; }
.article-entities .ent .type-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; margin-right: 6px; vertical-align: middle; }

.pager { display: flex; justify-content: space-between; margin-top: 60px; padding-top: 32px; border-top: 1px solid var(--line); font-family: var(--mono); font-size: 13px; }
.pager a { color: var(--fg-dim); }
.pager a:hover { color: var(--red); }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 40px 24px; text-align: center; color: var(--fg-mute); font-family: var(--mono); font-size: 12px; }
footer .hearts { color: var(--red); }

/* Utility */
.mono { font-family: var(--mono); }
.muted { color: var(--fg-mute); }

/* Responsive */
@media (max-width: 720px) {
  .hero h1 { font-size: 42px; }
  .stats { grid-template-columns: 1fr; }
  .boards { grid-template-columns: 1fr; }
  .article-card { grid-template-columns: 60px 1fr; }
  .article-card .arrow { display: none; }
  .graph-info { width: calc(100% - 24px); }
  #graph-canvas { height: 500px; }
  .nav { padding: 12px 16px; }
  .container { padding: 24px 16px 60px; }
}