/* === CSS自定义属性主题系统 === */
:root, [data-theme="warmOrange"] {
  --color-primary: #FF6B35;
  --color-primary-hover: #E55A2B;
  --color-secondary: #FF6B6B;
  --color-bg: #FFF5F0;
  --color-card-bg: #FFFFFF;
  --color-text-primary: #2D3436;
  --color-text-secondary: #636E72;
  --color-success: #00B578;
  --color-warning: #FF9500;
  --color-danger: #FF3B30;
  --color-border: #EDE8E5;
  --shadow-card: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-cta: 0 -2px 12px rgba(0,0,0,0.08);
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-badge: 20px;
  --font-size-title: 18px;
  --font-size-body: 14px;
  --font-size-small: 12px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --contact-footer-h: 92px;
  --cta-bar-h: 68px;
}

[data-theme="academicBlue"] {
  --color-primary: #2D5F8E;
  --color-primary-hover: #1E4570;
  --color-secondary: #4A90D9;
  --color-bg: #F5F9FC;
  --color-card-bg: #FFFFFF;
  --color-text-primary: #1A2B3C;
  --color-text-secondary: #5A6B7C;
  --color-border: #D8E4EF;
}
[data-theme="forestGreen"] {
  --color-primary: #00B578;
  --color-primary-hover: #009966;
  --color-secondary: #34C759;
  --color-bg: #F5FFF8;
  --color-card-bg: #FFFFFF;
  --color-text-primary: #1B3A2F;
  --color-text-secondary: #4A6B5C;
  --color-border: #D4EDE4;
}
[data-theme="redBlack"] {
  --color-primary: #E94560;
  --color-primary-hover: #C73652;
  --color-secondary: #FF6B6B;
  --color-bg: #1A1A2E;
  --color-card-bg: #16213E;
  --color-text-primary: #EAEAEA;
  --color-text-secondary: #B0B0B0;
  --color-border: #2A2A4A;
}
[data-theme="darkNeon"] {
  --color-primary: #FF006E;
  --color-primary-hover: #E0005F;
  --color-secondary: #FF3366;
  --color-bg: #0A0A0A;
  --color-card-bg: #1A1A1A;
  --color-text-primary: #E0E0E0;
  --color-text-secondary: #9A9A9A;
  --color-border: #333;
}
[data-theme="warmBeige"] {
  --color-primary: #D4A574;
  --color-primary-hover: #C49564;
  --color-secondary: #C49B6C;
  --color-bg: #FFF8F0;
  --color-card-bg: #FFFFFF;
  --color-text-primary: #4A3F35;
  --color-text-secondary: #7A6B5C;
  --color-border: #EDE0D0;
}

/* === 全局基础样式 === */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
  background: var(--color-bg);
  color: var(--color-text-primary);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* === 卡片栅格 === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 16px;
}
@media (max-width: 767px) { .card-grid { grid-template-columns: 1fr; } }
@media (min-width: 768px) and (max-width: 1023px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }

/* === 卡片组件 === */
.course-card {
  background: var(--color-card-bg);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  cursor: pointer;
}
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); }
.course-card.full { opacity: 0.6; pointer-events: none; }
.course-card.conflict { border: 2px solid var(--color-danger); animation: conflictFlash 0.6s ease-in-out 2; }

/* === 名额进度条 === */
.capacity-bar { height: 6px; border-radius: 3px; background: #eee; overflow: hidden; }
.capacity-bar-fill { height: 100%; border-radius: 3px; transition: width 0.6s ease-in-out; }
.capacity-safe { background: var(--color-success); }
.capacity-warn { background: var(--color-warning); }
.capacity-danger { background: var(--color-danger); animation: pulseGlow 1s infinite; }

/* === 固定底栏 === */
.cta-bar {
  position: fixed;
  left: 0; right: 0;
  bottom: calc(var(--contact-footer-h) + env(safe-area-inset-bottom));
  padding: 12px 16px; background: var(--color-card-bg);
  box-shadow: var(--shadow-cta); z-index: 100;
  display: flex; gap: 12px; align-items: center;
  transition: transform 0.3s ease;
}
.cta-bar.hidden { transform: translateY(100%); }

/* === 视图切换 === */
.view { display: none; }
.view.active { display: block; }

/* === 筛选标签 === */
.filter-tabs {
  display: flex; gap: 8px; overflow-x: auto;
  padding: 12px 16px; -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.filter-tabs::-webkit-scrollbar { display: none; }
.tab-indicator {
  position: absolute; bottom: 0; height: 3px;
  background: var(--color-primary); border-radius: 2px;
  transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === 表单 === */
.form-step { display: none; }
.form-step.active { display: block; }
.form-group { margin-bottom: 16px; }
.form-input {
  width: 100%; padding: 12px; border: 1px solid var(--color-border);
  border-radius: var(--radius-btn); font-size: 14px;
  transition: border-color var(--transition-fast);
}
.form-input:focus { border-color: var(--color-primary); outline: none; }
.form-input.error { border-color: var(--color-danger); }
.form-error-msg { color: var(--color-danger); font-size: var(--font-size-small); margin-top: 4px; }

/* === 步骤指示器 === */
.step-indicator { display: flex; justify-content: center; gap: 40px; padding: 20px 0; }
.step-dot {
  width: 32px; height: 32px; border-radius: 50%;
  background: #E0E0E0; color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; transition: all var(--transition-normal);
}
.step-dot.completed { background: var(--color-success); }
.step-dot.active { background: var(--color-primary); transform: scale(1.2); }

/* === 状态Badge === */
.status-badge {
  display: inline-block; padding: 2px 10px;
  border-radius: var(--radius-badge); font-size: var(--font-size-small);
}
.status-confirmed { background: #E8F8F0; color: var(--color-success); }
.status-pending { background: #FFF3E0; color: var(--color-warning); }
.status-waitlist { background: #F0F0F0; color: #8E8E93; }
.status-cancelled { background: #FFEBEE; color: var(--color-danger); }

/* === 响应式工具 === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* === 扩展组件 === */
.btn-primary, .btn-secondary {
  padding: 12px 20px; border: none; border-radius: var(--radius-btn);
  font-size: var(--font-size-body); font-weight: 600; cursor: pointer;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-secondary { background: transparent; color: var(--color-primary); border: 1px solid var(--color-border); }
.top-nav {
  position: sticky; top: 0; z-index: 90; display: flex; align-items: center; gap: 8px;
  padding: 10px 16px; background: var(--color-card-bg); border-bottom: 1px solid var(--color-border);
}
.top-nav button { background: none; border: none; font-size: 14px; color: var(--color-primary); cursor: pointer; }
.hero-wrap {
  min-height: 52vh; display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 48px 24px; text-align: center; background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
}
.hero-title { font-size: 32px; font-weight: 700; margin-bottom: 8px; }
.hero-subtitle { font-size: 18px; opacity: 0.95; margin-bottom: 24px; }
.hero-mode-btns { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.hero-mode-btn {
  padding: 14px 24px; border-radius: 999px; border: 2px solid rgba(255,255,255,.8);
  background: transparent; color: #fff; font-size: 16px; cursor: pointer;
}
.hero-mode-btn.active { background: #fff; color: var(--color-primary); border-color: #fff; }
.card-cover { width: 100%; aspect-ratio: 16/9; object-fit: cover; background: #eee; }
.card-body { padding: 12px 14px; }
.card-title { font-size: var(--font-size-title); font-weight: 600; margin-bottom: 4px; }
.card-sub { font-size: var(--font-size-small); color: var(--color-text-secondary); margin-bottom: 8px; }
.card-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 8px; }
.tag-pill { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: var(--color-bg); color: var(--color-text-secondary); }
.card-footer { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 8px; }
.card-select { width: 22px; height: 22px; accent-color: var(--color-primary); }
.detail-hero { position: relative; min-height: 200px; }
.detail-hero img { width: 100%; height: 220px; object-fit: cover; }
.detail-hero-overlay { position: absolute; inset: 0; background: linear-gradient(transparent, rgba(0,0,0,.55)); }
.detail-hero-text { position: absolute; bottom: 16px; left: 16px; right: 16px; color: #fff; }
.detail-section { padding: 16px; }
.detail-section h3 { margin-bottom: 8px; font-size: 16px; }
.schedule-row { display: flex; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--color-border); font-size: 14px; }
.conflict-banner { background: #FFEBEE; color: var(--color-danger); padding: 12px; margin: 12px 16px; border-radius: 8px; }
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.6); z-index: 200; display: flex; align-items: center; justify-content: center; }
.modal.hidden { display: none; }
.modal-content { background: var(--color-card-bg); padding: 16px; border-radius: 12px; max-width: 90vw; text-align: center; }
.theme-toggle { position: fixed; top: 12px; right: 12px; z-index: 110; width: 40px; height: 40px; border-radius: 50%; border: none; background: var(--color-card-bg); box-shadow: var(--shadow-card); cursor: pointer; }
.theme-picker { position: fixed; top: 56px; right: 12px; z-index: 110; background: var(--color-card-bg); padding: 12px; border-radius: 12px; box-shadow: var(--shadow-card); display: flex; gap: 8px; }
.theme-picker.hidden { display: none; }
.theme-dot { width: 28px; height: 28px; border-radius: 50%; border: 2px solid var(--color-border); cursor: pointer; }
.offline-banner { background: var(--color-warning); color: #fff; text-align: center; padding: 8px; font-size: 13px; }
.offline-banner.hidden { display: none; }
.hidden { display: none !important; }
.toast-r135 { position: fixed; bottom: 100px; left: 50%; transform: translateX(-50%); background: rgba(0,0,0,.8); color: #fff; padding: 10px 20px; border-radius: 999px; z-index: 300; font-size: 13px; }
.success-wrap { text-align: center; padding: 48px 24px; }
.success-icon { font-size: 64px; margin-bottom: 16px; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.admin-table th, .admin-table td { border: 1px solid var(--color-border); padding: 8px; text-align: left; }
.filter-tab { padding: 8px 14px; border-radius: 999px; border: 1px solid var(--color-border); background: var(--color-card-bg); cursor: pointer; white-space: nowrap; font-size: 13px; }
.filter-tab.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.countdown-bar { text-align: center; padding: 8px 16px; background: var(--color-card-bg); font-size: 13px; color: var(--color-warning); font-weight: 600; }
body.has-contact-footer { padding-bottom: calc(var(--contact-footer-h) + env(safe-area-inset-bottom)); }
body.has-contact-footer.has-cta-stack {
  padding-bottom: calc(var(--contact-footer-h) + var(--cta-bar-h) + env(safe-area-inset-bottom));
}
body.has-contact-footer .zw-root .zw-fab {
  bottom: calc(var(--contact-footer-h) + 12px + env(safe-area-inset-bottom));
}
.contact-footer {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 110;
  padding: 16px 16px calc(16px + env(safe-area-inset-bottom));
  background: #1a1a1a; color: #fff; text-align: center;
}
.contact-footer__btns { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-bottom: 8px; }
.contact-footer__cta, .contact-footer__btn { padding: 8px 16px; border-radius: 999px; font-size: 13px; text-decoration: none; }
.contact-footer__cta { background: var(--color-primary); color: #fff; }
.contact-footer__btn { background: #333; color: #fff; border: none; cursor: pointer; }
.contact-footer__brand { font-size: 11px; opacity: 0.7; margin: 0; }
.anim-card { animation: fadeInUp 0.5s ease both; }