/* college-ai-intro 共用視覺 —— 大專生用、沉穩學術感，跟 kids-ai-lab 同構但換色 */
:root {
  --bg: #f4f6fb;
  --ink: #1e2433;
  --brand: #3454d1;
  --brand-2: #16a596;
  --accent: #f2b134;
  --card: #ffffff;
  --shadow: 0 6px 20px rgba(0,0,0,.08);
  --radius: 16px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}
a { color: var(--brand); }

/* ===== hub 首頁 ===== */
.hub-head { text-align: center; padding: 40px 20px 8px; }
.hub-head h1 { font-size: 2.1rem; margin: 0 0 8px; }
.hub-head p { color: #666; margin: 4px 0; }

.wrap { max-width: 980px; margin: 0 auto; padding: 24px 20px 80px; }

.panel {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 20px 24px; margin-bottom: 24px;
}
.panel h2 { margin-top: 0; font-size: 1.15rem; }
.panel p { font-size: .92rem; color: #444; }
.panel table { width: 100%; border-collapse: collapse; font-size: .88rem; margin-top: 10px; }
.panel table th, .panel table td { text-align: left; padding: 6px 8px; border-bottom: 1px solid #eee; }

.chapter {
  display: flex; align-items: center; gap: 10px;
  margin: 32px 0 12px; font-size: 1.15rem; font-weight: 800; color: var(--ink);
}
.chapter::before {
  content: ""; width: 8px; height: 22px; border-radius: 6px; background: var(--brand);
}

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }

.card {
  display: flex; align-items: center; gap: 16px;
  text-decoration: none; color: inherit;
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 16px 20px; transition: transform .1s ease, box-shadow .1s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 26px rgba(0,0,0,.12); }
.card .emoji {
  flex-shrink: 0; width: 60px; height: 60px; border-radius: 16px;
  font-size: 2rem; background: #eef1fb;
  display: flex; align-items: center; justify-content: center;
}
.card .meta { flex: 1; min-width: 0; }
.card .t { font-weight: 800; font-size: 1rem; margin: 0 0 3px; }
.card .d { font-size: .84rem; color: #777; margin: 0; }
.card .badges { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 9px; }
.badge {
  display: inline-block; font-size: .72rem; font-weight: 800;
  padding: 3px 9px; border-radius: 999px;
}
.badge.new    { background: #e2e0ff; color: #4b3fa0; }  /* 平白新增章節 */
.badge.deepen { background: #d3f0ef; color: #0b6b66; }  /* 承接小學版、理論挖深 */
.badge.wip    { background: #ffe6c7; color: #a05a00; }  /* 大綱階段 */

footer { text-align: center; color: #999; font-size: .8rem; padding: 20px; }