/* ============================================================
   Tailwind 风格统一主题 - 暗黑/浅色双模式
   ============================================================ */

:root {
  --darkBg: #0f141e;
  --darkCard: #1a2230;
  --darkHover: #242e3f;
  --darkAccent: #818cf8;
  --darkText: #e2e8f0;
  --darkMuted: #94a3b8;

  --lightBg: #f4f6f8;
  --lightCard: #ffffff;
  --lightHover: #eef2ff;
  --lightAccent: #2563eb;
  --lightText: #1e293b;
  --lightMuted: #64748b;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  transition: background-color 0.3s, color 0.3s;
}

body {
  background: var(--darkBg);
  color: var(--darkText);
  min-height: 100vh;
  padding: 16px;
}

body.light {
  background: var(--lightBg);
  color: var(--lightText);
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--darkCard);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 16px;
  padding: 24px;
  transition: all 0.25s ease;
}
body.light .card {
  background: var(--lightCard);
  border: 1px solid rgba(0,0,0,0.06);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
body.light .card:hover {
  box-shadow: 0 6px 18px rgba(37,99,235,0.1);
}
.card h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card h2::before {
  content: '';
  width: 4px;
  height: 18px;
  background: var(--darkAccent);
  border-radius: 2px;
}
body.light .card h2::before { background: var(--lightAccent); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}
.btn-primary {
  background: var(--darkAccent);
  color: #fff;
}
.btn-primary:hover {
  background: #6366f1;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(129,140,248,0.4);
}
body.light .btn-primary {
  background: var(--lightAccent);
}
body.light .btn-primary:hover {
  background: #1d4ed8;
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}
.btn-secondary {
  background: var(--darkHover);
  color: var(--darkText);
}
.btn-secondary:hover { background: #2f3a4f; }
body.light .btn-secondary {
  background: var(--lightHover);
  color: var(--lightText);
}
body.light .btn-secondary:hover { background: #dbeafe; }
.btn-danger {
  background: rgba(239,68,68,0.15);
  color: #f87171;
}
.btn-danger:hover { background: rgba(239,68,68,0.25); }
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* ---------- 输入框 ---------- */
.input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 14px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(0,0,0,0.2);
  color: var(--darkText);
  transition: all 0.2s;
}
body.light .input {
  border: 1px solid #e2e8f0;
  background: #f8fafc;
  color: var(--lightText);
}
.input:focus {
  outline: none;
  border-color: var(--darkAccent);
  box-shadow: 0 0 0 3px rgba(129,140,248,0.15);
}
body.light .input:focus {
  border-color: var(--lightAccent);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 960px;
  margin: 0 auto 20px;
}
.topbar .brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--darkText);
  text-decoration: none;
}
body.light .topbar .brand { color: var(--lightText); }
.topbar .nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.topbar .nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--darkMuted);
  text-decoration: none;
  transition: all 0.2s;
}
body.light .topbar .nav a { color: var(--lightMuted); }
.topbar .nav a:hover {
  background: var(--darkHover);
  color: var(--darkText);
}
body.light .topbar .nav a:hover {
  background: var(--lightHover);
  color: var(--lightText);
}

/* ---------- 主题切换按钮 ---------- */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: none;
  background: var(--darkHover);
  color: var(--darkText);
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
body.light .theme-toggle {
  background: var(--lightHover);
  color: var(--lightText);
}
.theme-toggle:hover { transform: scale(1.05); }

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: 16px;
}
.grid-2 { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }

/* ---------- 标签/徽章 ---------- */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
}
.badge-success { background: rgba(34,197,94,0.15); color: #4ade80; }
.badge-warning { background: rgba(234,179,8,0.15); color: #facc15; }
.badge-danger { background: rgba(239,68,68,0.15); color: #f87171; }
.badge-info { background: rgba(99,102,241,0.15); color: #a5b4fc; }

/* ---------- 进度条 ---------- */
.progress-wrap {
  width: 100%;
  height: 8px;
  background: rgba(0,0,0,0.3);
  border-radius: 4px;
  overflow: hidden;
}
body.light .progress-wrap { background: #e2e8f0; }
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--darkAccent), #a855f7);
  transition: width 0.4s;
}
body.light .progress-bar {
  background: linear-gradient(90deg, var(--lightAccent), #8b5cf6);
}

/* ---------- 空状态 ---------- */
.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--darkMuted);
}
body.light .empty { color: var(--lightMuted); }
.empty-icon { font-size: 48px; margin-bottom: 12px; opacity: 0.5; }

/* ---------- 移动端 ---------- */
@media (max-width: 600px) {
  body { padding: 12px; }
  .card { padding: 16px; border-radius: 12px; }
  .grid-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .topbar { flex-direction: column; align-items: flex-start; }
}