:root {
  --bg: #08111d;
  --panel: #102236;
  --line: rgba(153, 196, 223, 0.3);
  --text: #e8f5ff;
  --muted: #9fc2da;
  --a: #36c0e6;
  --b: #f2af57;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--text);
  font-family: "Noto Sans SC", sans-serif;
  background: radial-gradient(900px 480px at 10% -10%, #28486a 0%, transparent 60%),
    radial-gradient(760px 500px at 90% -10%, #3f3558 0%, transparent 55%),
    linear-gradient(160deg, var(--bg), #0f1e32 48%, #0f2339);
}

.head {
  padding: 18px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 14, 25, 0.85);
}

.kicker {
  margin: 0;
  color: #8eb5d0;
  font-size: 0.78rem;
}

h1 {
  margin: 6px 0;
  font-family: "ZCOOL XiaoWei", serif;
  font-size: clamp(1.3rem, 2.4vw, 2rem);
}

.sub { margin: 0; color: var(--muted); font-size: 0.85rem; max-width: 840px; }

nav { display: flex; gap: 8px; }
nav a {
  text-decoration: none;
  color: #c8e8f8;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.8rem;
}

.wrap { padding: 12px; display: grid; gap: 12px; }

.panel {
  background: rgba(11, 24, 39, 0.9);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
}

h2 { margin: 0 0 8px; font-size: 1.03rem; }
h3 { margin: 0 0 4px; font-size: 0.88rem; color: #c2def1; }

.roadmap { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 10px; }
.roadmap article {
  border: 1px solid var(--line);
  background: rgba(6, 16, 27, 0.92);
  border-radius: 10px;
  padding: 8px;
}

.roadmap b { display: block; color: var(--b); font-size: 0.78rem; }
.roadmap span { font-size: 0.8rem; color: #bcd8ea; line-height: 1.4; }

.code {
  margin: 0;
  border: 1px solid rgba(146, 188, 215, 0.3);
  background: rgba(3, 11, 19, 0.92);
  border-radius: 10px;
  padding: 9px;
  font-size: 0.78rem;
  color: #bbe8fa;
  white-space: pre-wrap;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }

.grid-4 article,
.grid-3 article {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px;
  background: rgba(6, 16, 27, 0.9);
}

.grid-4 p,
.grid-3 span { margin: 0; color: #b7d4e8; font-size: 0.79rem; line-height: 1.45; }

.row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
select {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #081726;
  color: #ddf3ff;
  padding: 6px;
}

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-bottom: 8px; }
.m {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(6, 16, 27, 0.9);
  padding: 6px;
}
.m span { display: block; color: #93bad4; font-size: 0.72rem; }
.m b { font-size: 0.9rem; }

.tip { color: #9bc0d8; font-size: 0.76rem; margin: 6px 0 0; }

canvas {
  width: 100%;
  background: #f9f9f9;
  border: 1px solid var(--line);
  border-radius: 10px;
}

#knowledgeTreeCanvas {
  margin-bottom: 8px;
}

.compare {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(6, 16, 27, 0.9);
  padding: 8px;
  margin-bottom: 8px;
  font-size: 0.78rem;
  color: #c1dff0;
  line-height: 1.45;
}

.ai-card {
  margin-top: 8px;
  border: 1px solid rgba(109, 139, 232, 0.42);
  border-radius: 10px;
  background: rgba(18, 23, 51, 0.9);
  padding: 8px;
  font-size: 0.78rem;
  line-height: 1.55;
  color: #d0dcff;
}

.extra { margin-top: 8px; }

@media (max-width: 1180px) {
  .roadmap { grid-template-columns: 1fr 1fr; }
  .grid-2,
  .grid-4,
  .grid-3,
  .metrics { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .head { flex-direction: column; }
  .grid-2,
  .grid-4,
  .grid-3,
  .metrics,
  .roadmap { grid-template-columns: 1fr; }
}