/* ============================================================
   龚作台 · 千问风配色（浅色默认 / 暗色可切换）
   设计原则：浅底、极简、无装饰图标、单一克制强调色；卡片毛玻璃新拟态 + 悬停轻微放大
   ============================================================ */

:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --surface-2: #fafafc;
  --border: #ebecef;
  --border-strong: #dfe1e7;
  --text: #23252b;
  --text-2: #6e727c;
  --text-3: #9a9ea8;
  --accent: #615ced;
  --accent-strong: #4f4ad9;
  --accent-soft: #f0f0fc;
  --danger: #d9483b;
  --danger-soft: #fceeec;
  --ok: #1d9a78;
  --shadow: 0 1px 2px rgba(20,21,26,.04), 0 6px 20px rgba(20,21,26,.05);
  --radius: 12px;
  --radius-sm: 8px;
}

html[data-theme="dark"] {
  --bg: #101014;
  --surface: #17171c;
  --surface-2: #1d1d24;
  --border: #27272f;
  --border-strong: #33333d;
  --text: #e8e9ed;
  --text-2: #a2a5af;
  --text-3: #71747e;
  --accent: #7b77f5;
  --accent-strong: #918ef8;
  --accent-soft: #23234a;
  --danger: #e5675b;
  --danger-soft: #3a2224;
  --ok: #3fbf98;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 20px rgba(0,0,0,.25);
}
html[data-theme="dark"] body {
  background:
    radial-gradient(1100px 620px at 8% -10%, #1a1a3a, rgba(16,16,20,0) 55%),
    radial-gradient(900px 520px at 100% 0%, #241a36, rgba(16,16,20,0) 55%),
    var(--bg);
}

/* ---- 课程色（浅 / 暗两套） ---- */
.c-indigo { --c-bg:#eef0fe; --c-bd:#d9dcfb; --c-tx:#4a47c4; }
.c-teal   { --c-bg:#e7f6f3; --c-bd:#c9eae4; --c-tx:#12786c; }
.c-orange { --c-bg:#fdf1e6; --c-bd:#f8e0c6; --c-tx:#a85a19; }
.c-rose   { --c-bg:#fdeef2; --c-bd:#f9d6df; --c-tx:#ae3a5d; }
.c-cyan   { --c-bg:#e9f6fd; --c-bd:#d0e9f8; --c-tx:#14699f; }
.c-violet { --c-bg:#f4effd; --c-bd:#e4d9f9; --c-tx:#6d3fbf; }
html[data-theme="dark"] .c-indigo { --c-bg:#232350; --c-bd:#33346a; --c-tx:#b9b8f5; }
html[data-theme="dark"] .c-teal   { --c-bg:#10312c; --c-bd:#1c4a43; --c-tx:#7fd8c9; }
html[data-theme="dark"] .c-orange { --c-bg:#372512; --c-bd:#523a1d; --c-tx:#e9b27e; }
html[data-theme="dark"] .c-rose   { --c-bg:#371b26; --c-bd:#522a3a; --c-tx:#efa0b8; }
html[data-theme="dark"] .c-cyan   { --c-bg:#12293a; --c-bd:#1d3e56; --c-tx:#86c8ef; }
html[data-theme="dark"] .c-violet { --c-bg:#2b2140; --c-bd:#3f3260; --c-tx:#c3a7f0; }

/* ---- 基础 ---- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background:
    radial-gradient(1100px 620px at 6% -8%, #e9f0ff, rgba(245,246,250,0) 60%),
    radial-gradient(900px 520px at 100% 0%, #f5ecff, rgba(245,246,250,0) 55%),
    var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }
button { font-family: inherit; cursor: pointer; }
select { font-family: inherit; }

/* ---- 顶栏 ---- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  height: 60px; display: flex; align-items: center; gap: 28px;
}
.brand-link { display: flex; align-items: baseline; gap: 10px; }
.brand-title { font-size: 18px; font-weight: 700; color: var(--text); letter-spacing: .5px; }
.brand-sub { font-size: 12.5px; color: var(--text-3); }
.main-nav { display: flex; gap: 4px; flex: 1; }
.main-nav a {
  padding: 6px 14px; border-radius: 999px;
  color: var(--text-2); font-size: 14px; transition: all .15s;
}
.main-nav a:hover { color: var(--text); background: var(--surface-2); }
.main-nav a.active { color: var(--accent); background: var(--accent-soft); font-weight: 550; }
.header-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.text-btn {
  background: none; border: none; color: var(--text-2);
  font-size: 14px; padding: 6px 10px; border-radius: 8px; text-decoration: none;
}
.text-btn:hover { color: var(--text); background: var(--surface-2); }
.semester-select {
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 5px 10px; font-size: 13px; outline: none; max-width: 220px;
}
.menu-toggle { display: none; }
.mobile-nav { display: none; }

/* ---- 主区 ---- */
.app-main { flex: 1; width: 100%; max-width: 1200px; margin: 0 auto; padding: 28px 24px 60px; }
.loading { color: var(--text-3); padding: 60px 0; text-align: center; }
.view-head { margin-bottom: 20px; }
.view-title { font-size: 20px; font-weight: 650; }
.view-desc { color: var(--text-2); font-size: 13.5px; margin-top: 4px; }

/* ---- 卡片：毛玻璃新拟态 + 悬停轻微放大 ---- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease;
}
html:not([data-theme="dark"]) .card {
  background: rgba(255,255,255,.66);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-color: rgba(255,255,255,.6);
}
html[data-theme="dark"] .card {
  background: rgba(255,255,255,.06);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-color: rgba(255,255,255,.1);
}
.card:hover {
  transform: translateY(-2px) scale(1.012);
  box-shadow: 0 10px 24px rgba(31,35,60,.1), 0 22px 50px rgba(31,35,60,.10);
}
.card-pad { padding: 20px; }
.card + .card { margin-top: 16px; }

.grid { display: grid; gap: 16px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

/* ---- 首页 ---- */
.hero-week {
  display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap;
  padding: 24px 24px 20px;
}
.hero-date { font-size: 22px; font-weight: 650; }
.hero-weeknum { font-size: 15px; color: var(--accent); font-weight: 550; }
.hero-sub { color: var(--text-2); font-size: 13.5px; width: 100%; }
.stat-card { padding: 18px 20px; }
.stat-label { color: var(--text-2); font-size: 13px; }
.stat-value { font-size: 26px; font-weight: 650; margin-top: 6px; }
.stat-value small { font-size: 13px; font-weight: 400; color: var(--text-3); margin-left: 4px; }
.quick-links { display: flex; flex-wrap: wrap; gap: 10px; }
.quick-links a {
  border: 1px solid var(--border); border-radius: 999px;
  padding: 7px 16px; font-size: 13.5px; color: var(--text-2);
}
.quick-links a:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

/* ---- 课程 chip ---- */
.chip {
  display: block; border: 1px solid var(--c-bd); background: var(--c-bg);
  color: var(--c-tx); border-radius: var(--radius-sm);
  padding: 8px 10px; font-size: 12.5px; line-height: 1.5; cursor: pointer;
}
.chip .chip-name { font-weight: 600; font-size: 13px; display: block; }
.chip .chip-meta { color: var(--c-tx); opacity: .85; display: block; }
.today-list .chip { padding: 12px 14px; }
.today-list li { list-style: none; }

/* ---- 课表 ---- */
.sched-toolbar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 16px;
}
.week-nav-btn {
  border: 1px solid var(--border); background: var(--surface); color: var(--text-2);
  border-radius: 8px; padding: 6px 14px; font-size: 13.5px;
}
.week-nav-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.week-nav-btn:disabled { opacity: .4; cursor: not-allowed; }
.week-now { font-size: 15px; font-weight: 600; }
.week-select {
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  border-radius: 8px; padding: 6px 10px; font-size: 13.5px; outline: none;
}
.sched-hint { color: var(--text-3); font-size: 12.5px; margin-left: auto; }
.sched-table-wrap { overflow-x: auto; }
.sched-table { width: 100%; border-collapse: collapse; min-width: 860px; }
.sched-table th, .sched-table td {
  border: 1px solid var(--border); padding: 6px; vertical-align: top; text-align: left;
}
.sched-table thead th {
  background: var(--surface-2); font-weight: 600; font-size: 13.5px;
  text-align: center; padding: 10px 6px;
}
.sched-table thead th.weekend { color: var(--text-3); }
.sched-table thead th.today-col { color: var(--accent); background: var(--accent-soft); }
.period-cell {
  width: 92px; background: var(--surface-2); font-size: 12px; color: var(--text-2);
  white-space: nowrap;
}
.period-cell b { display: block; color: var(--text); font-size: 13px; }
.brk td { background: var(--surface-2); color: var(--text-3); font-size: 12px; text-align: center; padding: 3px; }
.chip-in-table .chip { min-height: 64px; }

/* ---- 日历 ---- */
.cal-toolbar { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.cal-title { font-size: 17px; font-weight: 650; min-width: 130px; }
.cal-week-badge { font-size: 13.5px; color: var(--accent); background: var(--accent-soft); border-radius: 999px; padding: 4px 12px; font-weight: 550; }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); border-left: 1px solid var(--border); border-top: 1px solid var(--border); }
.cal-dow { text-align: center; padding: 8px 4px; font-size: 13px; color: var(--text-2); background: var(--surface-2); border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.cal-cell {
  min-height: 96px; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border);
  padding: 6px 8px; cursor: pointer; position: relative; transition: background .12s;
}
.cal-cell:hover { background: var(--surface-2); }
.cal-cell.other-month { background: var(--surface-2); opacity: .55; }
.cal-cell.today { background: var(--accent-soft); }
.cal-date-row { display: flex; justify-content: space-between; align-items: center; gap: 4px; }
.cal-day-num { font-size: 14px; font-weight: 600; }
.cal-cell.today .cal-day-num { color: var(--accent); }
.cal-week-tag { font-size: 10.5px; color: var(--text-3); white-space: nowrap; }
.cal-week-tag.mine { color: var(--accent); font-weight: 600; }
.cal-holiday { color: var(--danger); font-size: 11px; margin-top: 2px; }
.cal-event { color: var(--text-2); font-size: 11px; margin-top: 2px; }
.cal-dots { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 8px; }
.cal-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--c-bd); border: 1px solid var(--c-tx); }
.cal-legend { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 14px; color: var(--text-2); font-size: 12.5px; }
.cal-legend span { display: inline-flex; align-items: center; gap: 6px; }
.day-detail h3 { font-size: 15px; margin-bottom: 10px; }
.day-detail ul { list-style: none; display: grid; gap: 8px; }

/* ---- 教学计划 ---- */
.plan-card .plan-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.plan-course { font-size: 16px; font-weight: 650; }
.plan-class { color: var(--text-2); font-size: 13px; }
.progress-row { display: flex; align-items: center; gap: 12px; margin: 12px 0; }
.progress-track { flex: 1; height: 8px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); overflow: hidden; }
.progress-fill { height: 100%; background: var(--accent); border-radius: 999px; transition: width .3s; }
.progress-num { font-size: 13px; color: var(--text-2); min-width: 88px; text-align: right; }
.chapter-list { list-style: none; border-top: 1px solid var(--border); }
.chapter-list li { display: flex; align-items: center; gap: 12px; padding: 10px 4px; border-bottom: 1px solid var(--border); font-size: 13.5px; }
.chapter-title { flex: 1; }
.chapter-meta { color: var(--text-3); font-size: 12.5px; white-space: nowrap; }
.status-chip { font-size: 11.5px; border-radius: 999px; padding: 2px 10px; white-space: nowrap; }
.status-done { background: var(--accent-soft); color: var(--accent); }
.status-doing { background: var(--c-bg, #fdf1e6); color: var(--c-tx, #a85a19); }
.status-todo { background: var(--surface-2); color: var(--text-3); border: 1px solid var(--border); }

/* ---- 科研成果 ---- */
.pub-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.pub-tab {
  border: 1px solid var(--border); background: var(--surface); color: var(--text-2);
  border-radius: 999px; padding: 6px 18px; font-size: 13.5px;
}
.pub-tab.active { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); font-weight: 550; }
.pub-year { font-size: 15px; font-weight: 650; color: var(--text-2); margin: 20px 0 10px; }
.pub-item { display: flex; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--border); align-items: baseline; flex-wrap: wrap; }
.pub-item:last-child { border-bottom: none; }
.pub-title { font-size: 14.5px; font-weight: 550; }
.pub-meta { color: var(--text-3); font-size: 12.5px; display: flex; gap: 10px; flex-wrap: wrap; }
.pub-tag { font-size: 11.5px; border: 1px solid var(--border); border-radius: 999px; padding: 1px 10px; color: var(--text-2); }
.pub-tag.ongoing { border-color: var(--accent); color: var(--accent); }
.pub-note { width: 100%; color: var(--text-3); font-size: 12.5px; }

/* ---- 关于 ---- */
.about-head { display: flex; gap: 20px; align-items: baseline; flex-wrap: wrap; }
.about-name { font-size: 22px; font-weight: 650; }
.about-title { color: var(--text-2); }
.about-bio { color: var(--text-2); margin-top: 12px; max-width: 720px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.tag {
  font-size: 12.5px; border: 1px solid var(--border); border-radius: 999px;
  padding: 4px 14px; color: var(--text-2); background: var(--surface-2);
}
.link-list { list-style: none; display: grid; gap: 8px; }
.link-list a { color: var(--text-2); }
.link-list a:hover { color: var(--accent); }

/* ---- 空态 / 提示 ---- */
.empty { color: var(--text-3); padding: 40px 0; text-align: center; font-size: 14px; }
.notice {
  background: var(--danger-soft); color: var(--danger);
  border-radius: var(--radius-sm); padding: 12px 16px; font-size: 13.5px; margin-bottom: 16px;
}
.holiday-banner {
  background: var(--danger-soft); color: var(--danger);
  border-radius: var(--radius-sm); padding: 10px 16px; font-size: 13.5px;
}

/* ---- 弹窗（日历点选当天课程） ---- */
.modal-overlay {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: center; justify-content: center;
  background: rgba(20,22,33,.4);
  -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px);
  padding: 20px;
}
.modal-overlay[hidden] { display: none; }
.modal {
  width: min(540px, 100%); max-height: 84vh; overflow: auto;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: 0 24px 60px rgba(0,0,0,.25);
  padding: 22px 24px; position: relative;
}
html:not([data-theme="dark"]) .modal { background: rgba(255,255,255,.92); -webkit-backdrop-filter: blur(20px) saturate(150%); backdrop-filter: blur(20px) saturate(150%); }
.modal-close {
  position: absolute; top: 12px; right: 16px; border: none; background: none;
  font-size: 24px; line-height: 1; color: var(--text-3); cursor: pointer;
}
.modal-close:hover { color: var(--text); }
.modal .day-detail h3 { font-size: 16px; margin-bottom: 12px; }
.modal .day-detail ul { list-style: none; display: grid; gap: 10px; }

/* ---- 页脚 ---- */
.site-footer {
  border-top: 1px solid var(--border); color: var(--text-3);
  font-size: 12.5px; text-align: center; padding: 18px;
  background: var(--surface);
}

/* ---- 响应式 ---- */
@media (max-width: 900px) {
  .main-nav { display: none; }
  .menu-toggle { display: block; }
  .mobile-nav {
    display: none; flex-direction: column; padding: 8px 16px 14px;
    border-top: 1px solid var(--border); background: var(--surface);
  }
  .mobile-nav.open { display: flex; }
  .mobile-nav a { padding: 10px 8px; color: var(--text-2); border-radius: 8px; }
  .mobile-nav a.active { color: var(--accent); background: var(--accent-soft); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .header-inner { gap: 14px; padding: 0 16px; }
  .app-main { padding: 20px 16px 50px; }
  .semester-select { max-width: 150px; }
}
@media (max-width: 560px) {
  .grid-4 { grid-template-columns: 1fr; }
  .cal-cell { min-height: 72px; padding: 4px 5px; }
  .cal-week-tag { display: none; }
  .cal-week-tag.mine { display: inline; }
  .hero-week { padding: 18px 16px 14px; }
  .github-link-desktop { display: none; }
}