:root {
  --bg: #0b0f17;
  --bg2: #0f1522;
  --card: #131b29;
  --border: #1f2a3c;
  --text: #e6edf3;
  --muted: #8b98ab;
  --accent: #4f8ff7;
  --accent2: #7c5cff;
  --ok: #3fb950;
  --warn: #d29922;
  --err: #f85149;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.3; margin: 0 0 .5em; }
p { margin: 0 0 .8em; }
.muted { color: var(--muted); }
.hidden { display: none !important; }

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 32px;
  background: rgba(11, 15, 23, .85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  font-size: 13px;
  font-family: var(--mono);
}
.nav-links { display: flex; gap: 20px; }
.nav-links a { color: var(--muted); font-size: 15px; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav .spacer, .nav .badge-demo { margin-left: auto; }
.badge-demo {
  font-size: 12px;
  color: var(--warn);
  border: 1px solid rgba(210, 153, 34, .4);
  border-radius: 999px;
  padding: 2px 10px;
}

/* ---------- hero ---------- */
.hero {
  padding: 96px 32px 72px;
  background:
    radial-gradient(800px 400px at 70% -10%, rgba(79, 143, 247, .18), transparent),
    radial-gradient(600px 300px at 15% 110%, rgba(124, 92, 255, .12), transparent);
  border-bottom: 1px solid var(--border);
}
.hero-inner { max-width: 960px; margin: 0 auto; }
.hero h1 { font-size: 44px; letter-spacing: -.02em; }
.hero .accent {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .sub { font-size: 18px; color: var(--muted); max-width: 640px; }
.hero-cta { display: flex; gap: 14px; margin: 28px 0 36px; }

.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 15px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.primary:hover { background: #3f7fe0; }

.hero-stats { display: flex; gap: 48px; }
.stat .num { font-size: 28px; font-weight: 700; font-family: var(--mono); }
.stat .lbl { color: var(--muted); font-size: 13px; }

/* ---------- sections ---------- */
.section, .section-wide { max-width: 1080px; margin: 0 auto; padding: 56px 32px; width: 100%; }
.section h2 { font-size: 26px; }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 24px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
}
.feature h3 { font-size: 17px; }
.feature p { color: var(--muted); font-size: 14px; margin: 0; }

.top-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; margin-top: 24px; }
.top-card .rank-line { display: flex; align-items: center; gap: 10px; }
.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--bg2);
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-weight: 700;
}
.top-card .name { font-weight: 700; font-size: 17px; }
.top-card .score { margin-left: auto; font-family: var(--mono); font-weight: 700; color: var(--accent); }
.top-card .vendor { color: var(--muted); font-size: 13px; margin: 8px 0 12px; }

.bar { height: 8px; border-radius: 4px; background: var(--bg2); overflow: hidden; }
.bar-fill { height: 100%; border-radius: 4px; background: linear-gradient(90deg, var(--accent), var(--accent2)); }

/* ---------- rankings ---------- */
.page-head { display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.page-head h1 { font-size: 30px; margin: 0; }
.tabs { display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap; }
.tab {
  padding: 7px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 14px;
}
.tab:hover { color: var(--text); border-color: var(--accent); }
.tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.rank-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 20px; align-items: start; }
@media (max-width: 900px) { .rank-layout { grid-template-columns: 1fr; } }

.rank-table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.rank-table th, .rank-table td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
.rank-table thead th { color: var(--muted); font-weight: 600; font-size: 13px; background: var(--bg2); }
.rank-table tbody tr { cursor: pointer; }
.rank-table tbody tr:hover { background: rgba(79, 143, 247, .06); }
.rank-table tbody tr.selected { background: rgba(79, 143, 247, .12); }
.rank-table td.rank, .rank-table td.score { font-family: var(--mono); }
.rank-table td.score { font-weight: 700; color: var(--accent); }
.rank-table .model-name { font-weight: 600; }
.rank-table .model-release { color: var(--muted); font-size: 12px; }
.license-badge {
  font-size: 12px;
  border-radius: 999px;
  padding: 1px 10px;
  border: 1px solid var(--border);
}
.license-badge.open { color: var(--ok); border-color: rgba(63, 185, 80, .4); }
.license-badge.prop { color: var(--accent); border-color: rgba(79, 143, 247, .4); }

.detail h3 { font-size: 20px; margin-bottom: 2px; }
.detail .vendor { color: var(--muted); margin-bottom: 14px; }
.meta-row { display: flex; justify-content: space-between; font-size: 13px; padding: 6px 0; border-bottom: 1px dashed var(--border); }
.meta-row .k { color: var(--muted); }
.meta-row .v { font-family: var(--mono); }
.bar-row { margin: 12px 0; }
.bar-row .bar-label { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 5px; }
.bar-row .bar-label .val { font-family: var(--mono); color: var(--accent); }

/* ---------- playground ---------- */
.playground { max-width: 1280px; margin: 0 auto; padding: 28px 32px 40px; width: 100%; }
.pg-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.pg-head h1 { font-size: 26px; margin: 0; }
.pg-actions { display: flex; gap: 10px; }

.pg-layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 18px; align-items: stretch; }
@media (max-width: 980px) { .pg-layout { grid-template-columns: 1fr; } }

.editor-pane { padding: 0; display: flex; flex-direction: column; overflow: hidden; }
.editor-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
#doc-id { font-family: var(--mono); color: var(--muted); }
.conn { display: inline-flex; align-items: center; gap: 7px; }
.conn::before { content: ""; width: 8px; height: 8px; border-radius: 50%; }
.conn.on::before { background: var(--ok); box-shadow: 0 0 6px var(--ok); }
.conn.off::before { background: var(--err); }

#editor {
  flex: 1;
  min-height: 56vh;
  width: 100%;
  border: 0;
  outline: none;
  resize: none;
  background: transparent;
  color: var(--text);
  padding: 16px;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.7;
  tab-size: 4;
}

.side-pane { display: flex; flex-direction: column; gap: 18px; }
.peers-card h3, .log-card h3 { font-size: 15px; }
.peers-card ul { list-style: none; margin: 0; padding: 0; }
.peers-card li { display: flex; align-items: center; gap: 10px; padding: 7px 0; font-size: 14px; }
.peer-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.peer-dot.ai { background: var(--accent2); }
.peer-dot.you { background: var(--ok); }
.peer-state { margin-left: auto; color: var(--muted); font-size: 12px; }
.peers-card li.typing .peer-state { color: var(--accent2); }

.log-card { flex: 1; display: flex; flex-direction: column; min-height: 240px; }
.log {
  flex: 1;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.55;
  max-height: 300px;
}
.log-line { padding: 2px 0; border-bottom: 1px dashed rgba(31, 42, 60, .6); word-break: break-all; }
.log-line.ok { color: var(--ok); }
.log-line.info { color: var(--muted); }
.log-line.warn { color: var(--warn); }
.log-line.error { color: var(--err); }

.statusbar {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin-top: 16px;
  padding: 10px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 13px;
  color: var(--muted);
}
.statusbar b { color: var(--text); font-family: var(--mono); font-weight: 600; margin-left: 4px; }

/* ---------- footer ---------- */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 26px 32px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}