/* ========== 全局变量 ========== */
:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #dbeafe;
  --primary-dark: #1e40af;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --success: #10b981;
  --success-light: #d1fae5;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --bg: #f0f4ff;
  --card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --radius: 12px;
  --radius-sm: 8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

/* ========== Reset ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; }

/* ========== Hero 横幅 ========== */
.hero {
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  color: #fff;
  text-align: center;
  padding: 3rem 1rem 2.5rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 300px;
  height: 300px;
  background: rgba(255,255,255,0.08);
  border-radius: 50%;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 200px;
  height: 200px;
  background: rgba(255,255,255,0.06);
  border-radius: 50%;
}
.hero-inner { position: relative; z-index: 1; }
.hero-title { font-size: 2rem; font-weight: 800; margin-bottom: 0.3rem; letter-spacing: 2px; }
.hero-subtitle { font-size: 1.1rem; opacity: 0.9; margin-bottom: 0.8rem; }
.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(10px);
  padding: 0.4rem 1.2rem;
  border-radius: 50px;
  font-size: 0.9rem;
  border: 1px solid rgba(255,255,255,0.3);
}

/* ========== 容器 ========== */
.container { max-width: 1200px; margin: 0 auto; padding: 1.5rem 1rem 3rem; }

/* ========== 标签 ========== */
.tabs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 0.6rem 1.5rem;
  border: 2px solid var(--border);
  background: var(--card);
  border-radius: 50px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.25s;
  color: var(--text-muted);
}
.tab-btn:hover { border-color: var(--primary); color: var(--primary); }
.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}
.tab-right { margin-left: auto; display: flex; gap: 0.5rem; }
.link-btn {
  padding: 0.5rem 1rem;
  border: none;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}
.link-btn:hover { background: var(--primary-light); }

/* ========== 报名须知 ========== */
.notice-bar {
  background: var(--warning-light);
  border-left: 4px solid var(--warning);
  border-radius: var(--radius-sm);
  padding: 0.8rem 1rem;
  margin-bottom: 1.5rem;
}
.notice-item { font-size: 0.85rem; color: #92400e; line-height: 1.8; }

/* ========== 课程网格 ========== */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

/* ========== 课程卡片 ========== */
.course-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
}
.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.course-card.full { opacity: 0.78; border-color: var(--border); background: var(--bg); }
.course-card.full:hover { transform: none; box-shadow: var(--shadow); }

.full-badge {
  flex-shrink: 0;
  margin-left: 0.5rem;
  background: var(--danger);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.12rem 0.5rem;
  border-radius: 50px;
  letter-spacing: 0.05em;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}
.header-right { display: flex; align-items: center; gap: 0.4rem; flex-shrink: 0; }
.course-name { font-size: 1.2rem; font-weight: 700; color: var(--text); }
.course-session {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--primary-light);
  padding: 0.15rem 0.5rem;
  border-radius: 50px;
  white-space: nowrap;
}
.course-info {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
  flex: 1;
}
.info-row {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.info-row .label {
  color: var(--text-light);
  min-width: 3rem;
  flex-shrink: 0;
}
.info-row .value { color: var(--text); }
.info-row .notes-text { font-size: 0.8rem; line-height: 1.5; white-space: pre-line; }

.course-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  margin-top: 0.5rem;
}
.capacity-info { font-size: 0.85rem; }
.capacity-info .full-text { color: var(--danger); font-weight: 600; }
.capacity-info .available-text { color: var(--success); font-weight: 600; }
.capacity-info .unlimited-text { color: var(--text-muted); }

.age-badge {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.15rem 0.6rem;
  border-radius: 50px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 500;
}

/* ========== 按钮 ========== */
.btn {
  padding: 0.55rem 1.2rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); box-shadow: 0 4px 12px rgba(37,99,235,0.3); }
.btn-primary:disabled { background: var(--text-light); cursor: not-allowed; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; }
.btn-secondary { background: var(--border); color: var(--text); }
.btn-secondary:hover { background: #cbd5e1; }
.btn-block { width: 100%; }
.btn-sm { padding: 0.35rem 0.8rem; font-size: 0.82rem; }

/* ========== 空状态 ========== */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
  font-size: 1rem;
}

/* ========== 弹窗 ========== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}
.modal {
  background: var(--card);
  border-radius: var(--radius);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalIn 0.25s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}
.modal-header h2 { font-size: 1.15rem; }
.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s;
}
.close-btn:hover { background: var(--border); }
.modal-body { padding: 1.5rem; }

/* ========== 课程信息卡片 ========== */
.course-detail {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 1.25rem;
}
.course-detail .detail-row {
  display: flex;
  gap: 0.5rem;
  font-size: 0.88rem;
  margin-bottom: 0.4rem;
}
.course-detail .detail-label { color: var(--text-light); min-width: 4rem; }
.course-detail .detail-value { color: var(--text); }

/* ========== 表单 ========== */
.form-group { margin-bottom: 1rem; }
.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.35rem;
}
.form-group input,
.form-group select {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font);
  transition: border-color 0.2s;
  background: var(--card);
  color: var(--text);
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
}
.form-group input.error {
  border-color: var(--danger);
}
.form-error {
  color: var(--danger);
  font-size: 0.82rem;
  margin-top: 0.25rem;
}
.form-hint {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

/* ========== 复选框 ========== */
.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  cursor: pointer;
  accent-color: var(--primary);
}
.checkbox-group label {
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  font-weight: 400;
}

/* ========== 报名成功 ========== */
.success-result {
  text-align: center;
  padding: 1rem;
}
.success-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 0.75rem;
  background: var(--success-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}
.success-result h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.success-detail {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  margin: 0.75rem 0;
  text-align: left;
  font-size: 0.88rem;
}
.success-detail .row { margin-bottom: 0.3rem; }
.success-detail .row .label { color: var(--text-light); display: inline-block; min-width: 4rem; }

/* ========== 我的报名记录 ========== */
.reg-record {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  border-left: 3px solid var(--primary);
}
.reg-record .reg-name { font-weight: 600; font-size: 0.95rem; }
.reg-record .reg-info { font-size: 0.82rem; color: var(--text-muted); margin-top: 0.2rem; }
.reg-record .reg-status {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.1rem 0.5rem;
  border-radius: 50px;
  background: var(--success-light);
  color: var(--success);
  margin-top: 0.25rem;
}

/* ========== Toast ========== */
.toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.toast {
  background: var(--card);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow-lg);
  min-width: 280px;
  max-width: 360px;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  animation: toastIn 0.25s ease;
  border-left: 4px solid var(--primary);
}
@keyframes toastIn {
  from { opacity: 0; transform: translateX(100%); }
  to { opacity: 1; transform: translateX(0); }
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }
.toast-icon { font-size: 1.1rem; }
.toast-content { flex: 1; }
.toast-title { font-weight: 600; font-size: 0.9rem; }
.toast-msg { font-size: 0.82rem; color: var(--text-muted); margin-top: 0.15rem; }

/* ========== 分页 ========== */
.pagination { display:flex; justify-content:space-between; align-items:center; margin-top:1rem; flex-wrap:wrap; gap:0.5rem; }
.page-info { font-size:0.85rem; color:var(--text-muted); }
.page-btns { display:flex; align-items:center; gap:0.5rem; }
.page-cur { font-size:0.85rem; color:var(--text); padding:0 0.5rem; }
.page-btns .btn:disabled { opacity:0.5; cursor:not-allowed; }

/* ========== 屏蔽标记 ========== */
.badge-block { display:inline-block; background:var(--danger-light); color:var(--danger); font-size:0.75rem; font-weight:700; padding:0.15rem 0.6rem; border-radius:50px; white-space:nowrap; }

/* ========== 页脚 ========== */
.footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  background: var(--card);
}

/* ========== 加载状态 ========== */
.loading {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}
.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 0.75rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ========== 年份切换 ========== */
.year-switch {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 1.25rem 0 0.5rem;
  flex-wrap: wrap;
}
.year-switch label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}
.year-switch select {
  padding: 0.5rem 0.9rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--card);
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
}
.year-switch select:focus { outline: none; border-color: var(--primary); }

/* ========== 活动状态横幅 ========== */
.activity-banner {
  padding: 0.85rem 1.25rem;
  margin: 0 auto;
  max-width: 960px;
  border-radius: var(--radius);
  font-size: 0.92rem;
  line-height: 1.6;
  text-align: center;
  font-weight: 500;
}
.banner-warning {
  background: #fff8e1;
  color: #8a6d3b;
  border: 1px solid #ffe082;
}
.banner-success {
  background: #e8f5e9;
  color: #2e7d32;
  border: 1px solid #a5d6a7;
}
.banner-danger {
  background: #ffebee;
  color: #c62828;
  border: 1px solid #ef9a9a;
}

/* ========== 须知弹窗内容 ========== */
.notice-content {
  font-size: 0.92rem;
  line-height: 1.9;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  max-height: 50vh;
  overflow-y: auto;
}
.notice-content p { margin: 0 0 0.35rem; }

/* ========== 响应式 ========== */
@media (max-width: 640px) {
  .hero { padding: 2rem 1rem 1.5rem; }
  .hero-title { font-size: 1.5rem; }
  .hero-subtitle { font-size: 0.95rem; }
  .tabs { flex-direction: column; align-items: stretch; }
  .tab-btn { width: 100%; }
  .tab-right { margin-left: 0; justify-content: flex-end; margin-top: 0.25rem; }
  .course-grid { grid-template-columns: 1fr; }
  .modal { max-width: 100%; }
  .toast { min-width: auto; max-width: calc(100vw - 2rem); }
}