/* ==================== CSS 变量与基础样式 - 现代Z世代风格 ==================== */
:root {
  /* 主色调 - 电光紫到蓝紫渐变 */
  --primary: #6366f1;
  --primary-light: #e0e7ff;
  --primary-dark: #4f46e5;
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  
  /* 辅助色 - 赛博朋克风 */
  --success: #10b981;
  --success-light: #d1fae5;
  --success-dark: #059669;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --warning-dark: #d97706;
  --danger: #f43f5e;
  --danger-light: #ffe4e6;
  --danger-dark: #e11d48;
  
  /* 强调色 - 霓虹系 */
  --neon-cyan: #00f5ff;
  --neon-pink: #ff00ff;
  --neon-purple: #bf00ff;
  --neon-green: #39ff14;
  
  /* 灰度色 */
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  
  /* 边框圆角 - 更加圆润 */
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* 阴影 - 多层阴影 */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
  --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.08), 0 10px 10px -5px rgba(0,0,0,0.04);
  --shadow-glow: 0 0 20px rgba(99,102,241,0.3);
  
  /* 玻璃态效果 */
  --glass-bg: rgba(255,255,255,0.7);
  --glass-border: rgba(255,255,255,0.5);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==================== 全局动画 ==================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 5px rgba(99,102,241,0.5); }
  50% { box-shadow: 0 0 20px rgba(99,102,241,0.8), 0 0 30px rgba(99,102,241,0.4); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.animate-fadeIn { animation: fadeIn 0.4s ease-out; }
.animate-slideInUp { animation: slideInUp 0.5s ease-out; }
.animate-pulse { animation: pulse 2s infinite; }
.animate-glow { animation: glow 2s infinite; }
.animate-float { animation: float 3s ease-in-out infinite; }

/* ==================== 布局 ==================== */
.app-header {
  background: linear-gradient(135deg, rgba(99,102,241,0.95) 0%, rgba(79,70,229,0.95) 50%, rgba(124,58,237,0.95) 100%);
  color: white;
  padding: 0 24px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.app-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  animation: shimmer 3s infinite;
  pointer-events: none;
}

.app-header h1 { 
  font-size: 22px; 
  font-weight: 700; 
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, #fff, #e0e7ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-header .nav { 
  display: flex; 
  gap: 8px; 
  align-items: center;
}

.app-header .nav button {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.15);
  color: white;
  padding: 10px 18px;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.app-header .nav button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.app-header .nav button:hover { 
  background: rgba(255,255,255,0.25);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.app-header .nav button:hover::before {
  left: 100%;
}

.app-header .nav button.active { 
  background: rgba(255,255,255,0.3);
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.main-content { 
  max-width: 1400px; 
  margin: 0 auto; 
  padding: 28px;
}

/* ==================== 卡片 ==================== */
.card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 28px;
  margin-bottom: 24px;
  border: 1px solid rgba(0,0,0,0.04);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--neon-purple), var(--neon-pink));
  opacity: 0;
  transition: opacity 0.3s;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card:hover::before {
  opacity: 1;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--gray-200);
}

.card-header h2 { 
  font-size: 20px; 
  font-weight: 700;
  color: var(--gray-900);
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ==================== 按钮 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary { 
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  box-shadow: 0 4px 14px rgba(99,102,241,0.4);
}

.btn-primary:hover { 
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99,102,241,0.5);
}

.btn-success { 
  background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
  color: white;
  box-shadow: 0 4px 14px rgba(16,185,129,0.4);
}

.btn-success:hover { 
  background: linear-gradient(135deg, var(--success-dark) 0%, var(--success) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16,185,129,0.5);
}

.btn-warning { 
  background: linear-gradient(135deg, var(--warning) 0%, var(--warning-dark) 100%);
  color: white;
  box-shadow: 0 4px 14px rgba(245,158,11,0.4);
}

.btn-warning:hover { 
  background: linear-gradient(135deg, var(--warning-dark) 0%, var(--warning) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245,158,11,0.5);
}

.btn-danger { 
  background: linear-gradient(135deg, var(--danger) 0%, var(--danger-dark) 100%);
  color: white;
  box-shadow: 0 4px 14px rgba(244,63,94,0.4);
}

.btn-danger:hover { 
  background: linear-gradient(135deg, var(--danger-dark) 0%, var(--danger) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(244,63,94,0.5);
}

.btn-outline {
  background: white;
  border: 2px solid var(--gray-200);
  color: var(--gray-700);
  position: relative;
}

.btn-outline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
  opacity: 0;
  border-radius: inherit;
  transition: opacity 0.3s;
  z-index: -1;
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
  transform: translateY(-2px);
}

.btn-outline:hover::before {
  opacity: 0.1;
}

.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }

/* ==================== 表单 ==================== */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-700);
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 15px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: inherit;
  background: white;
}

.form-group input::placeholder, .form-group textarea::placeholder {
  color: var(--gray-400);
}

.form-group input:hover, .form-group select:hover, .form-group textarea:hover {
  border-color: var(--gray-300);
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.1);
  transform: translateY(-1px);
}

.form-group textarea { resize: vertical; min-height: 100px; }

.form-row { 
  display: grid; 
  grid-template-columns: 1fr 1fr; 
  gap: 20px; 
}

.form-row-3 { 
  display: grid; 
  grid-template-columns: 1fr 1fr 1fr; 
  gap: 20px; 
}

/* ==================== 表格 ==================== */
.table-wrapper { 
  overflow-x: auto; 
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
}

table { 
  width: 100%; 
  border-collapse: collapse; 
  font-size: 14px;
  background: white;
}

th, td { 
  padding: 14px 18px; 
  text-align: left; 
  border-bottom: 1px solid var(--gray-200);
}

th { 
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--gray-100) 100%);
  font-weight: 700;
  color: var(--gray-700);
  white-space: nowrap;
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.5px;
}

tr {
  transition: all 0.2s;
}

tr:hover { 
  background: var(--gray-50);
  transform: scale(1.002);
}

/* ==================== 状态标签 ==================== */
.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.status-pending { 
  background: var(--warning-light); 
  color: var(--warning-dark);
}

.status-pending::before {
  background: var(--warning);
  animation: pulse 2s infinite;
}

.status-approved { 
  background: var(--success-light); 
  color: var(--success-dark);
}

.status-approved::before {
  background: var(--success);
}

.status-rejected { 
  background: var(--danger-light); 
  color: var(--danger-dark);
}

.status-rejected::before {
  background: var(--danger);
}

.status-cancelled { 
  background: var(--gray-100); 
  color: var(--gray-600);
}

.status-cancel-pending { 
  background: var(--primary-light); 
  color: var(--primary-dark);
}

.status-cancel-pending::before {
  background: var(--primary);
  animation: pulse 2s infinite;
}

/* ==================== 模态框 ==================== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15,23,42,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-overlay.show { 
  opacity: 1; 
  visibility: visible; 
}

.modal {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg), 0 25px 50px -12px rgba(0,0,0,0.25);
  width: 92%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(30px) scale(0.95);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(255,255,255,0.1);
}

.modal-overlay.show .modal { 
  transform: translateY(0) scale(1); 
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 28px;
  border-bottom: 1px solid var(--gray-200);
  background: linear-gradient(180deg, var(--gray-50) 0%, white 100%);
}

.modal-header h3 { 
  font-size: 20px; 
  font-weight: 700;
  color: var(--gray-900);
}

.modal-close {
  background: none;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: var(--gray-500);
  padding: 4px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  transition: all 0.2s;
}

.modal-close:hover { 
  background: var(--gray-100);
  color: var(--gray-800);
  transform: rotate(90deg);
}

.modal-body { padding: 28px; }

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 20px 28px;
  border-top: 1px solid var(--gray-200);
  background: var(--gray-50);
}

/* ==================== 日历视图 ==================== */
.calendar-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
  padding: 16px;
  background: var(--gray-50);
  border-radius: var(--radius-lg);
}

.calendar-nav button {
  background: white;
  border: 2px solid var(--gray-200);
  padding: 10px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s;
  color: var(--gray-700);
}

.calendar-nav button:hover { 
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.calendar-nav .current-date { 
  font-size: 20px; 
  font-weight: 700;
  min-width: 200px; 
  text-align: center;
  color: var(--gray-800);
  letter-spacing: 0.5px;
}

.time-slots {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.time-slot {
  padding: 14px 10px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 14px;
  font-weight: 600;
  background: white;
}

.time-slot:hover:not(.busy) { 
  border-color: var(--primary);
  background: var(--primary-light);
  transform: translateY(-3px);
  box-shadow: 0 8px 16px rgba(99,102,241,0.2);
}

.time-slot.selected { 
  border-color: var(--primary);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(99,102,241,0.4);
}

.time-slot.busy {
  background: var(--danger-light);
  border-color: var(--danger);
  color: var(--danger);
  cursor: not-allowed;
  text-decoration: line-through;
  opacity: 0.7;
}

.time-slot.pending {
  background: var(--warning-light);
  border-color: var(--warning);
  color: var(--warning-dark);
}

.time-slot .slot-label { 
  font-size: 11px; 
  color: var(--gray-500); 
  margin-top: 4px;
  font-weight: 500;
}

.time-slot.selected .slot-label {
  color: rgba(255,255,255,0.8);
}

.time-slot.busy .slot-label { color: var(--danger); }
.time-slot.pending .slot-label { color: var(--warning); }

/* ==================== 统计卡片 ==================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}

.stat-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(0,0,0,0.04);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--neon-purple));
  opacity: 0;
  transition: opacity 0.3s;
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat-card:hover::before {
  opacity: 1;
}

.stat-card .stat-value { 
  font-size: 40px; 
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-card .stat-label { 
  font-size: 14px; 
  color: var(--gray-500);
  margin-top: 8px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-card.warning .stat-value { 
  background: linear-gradient(135deg, var(--warning) 0%, var(--warning-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-card.success .stat-value { 
  background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ==================== 筛选栏 ==================== */
.filter-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 20px;
}

.filter-bar input, .filter-bar select {
  padding: 10px 16px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-full);
  font-size: 14px;
  background: white;
  transition: all 0.2s;
  min-width: 140px;
}

.filter-bar input:focus, .filter-bar select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.1);
}

/* ==================== 分页 ==================== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
}

.pagination button {
  padding: 8px 16px;
  border: 2px solid var(--gray-200);
  background: white;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.pagination button:hover:not(:disabled) { 
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.pagination button:disabled { 
  opacity: 0.5; 
  cursor: not-allowed;
  background: var(--gray-100);
}

.pagination .page-info { 
  font-size: 14px; 
  color: var(--gray-600);
  font-weight: 500;
}

/* ==================== Toast 提示 ==================== */
.toast-container {
  position: fixed;
  top: 90px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  padding: 16px 24px;
  border-radius: var(--radius);
  color: white;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: slideInRight 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  max-width: 400px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
  overflow: hidden;
}

.toast::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.toast-success { 
  background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
}

.toast-success::before {
  background: rgba(255,255,255,0.5);
}

.toast-error { 
  background: linear-gradient(135deg, var(--danger) 0%, var(--danger-dark) 100%);
}

.toast-error::before {
  background: rgba(255,255,255,0.5);
}

.toast-warning { 
  background: linear-gradient(135deg, var(--warning) 0%, var(--warning-dark) 100%);
  color: white;
}

.toast-warning::before {
  background: rgba(255,255,255,0.5);
}

/* ==================== 登录页 ==================== */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 25%, #f093fb 50%, #4facfe 75%, #00f2fe 100%);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  position: relative;
  overflow: hidden;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.login-page::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(255,255,255,0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(255,255,255,0.05) 0%, transparent 30%);
  pointer-events: none;
}

.login-box {
  background: rgba(255,255,255,0.95);
  border-radius: var(--radius-xl);
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25), 0 0 0 1px rgba(255,255,255,0.1);
  padding: 48px;
  width: 90%;
  max-width: 440px;
  position: relative;
  z-index: 1;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.5);
}

.login-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--neon-purple), var(--neon-pink));
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.login-box h2 { 
  text-align: center; 
  margin-bottom: 8px; 
  color: var(--gray-900);
  font-size: 28px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gray-900) 0%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.login-box .subtitle { 
  text-align: center; 
  color: var(--gray-500); 
  margin-bottom: 32px; 
  font-size: 15px;
  font-weight: 500;
}

.login-box .btn { 
  width: 100%; 
  justify-content: center; 
  padding: 14px; 
  font-size: 16px;
  margin-top: 8px;
}

.login-box .form-group input {
  background: var(--gray-50);
  border-color: var(--gray-200);
}

.login-box .form-group input:focus {
  background: white;
}

.login-box a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  position: relative;
}

.login-box a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--neon-purple));
  transition: width 0.3s;
}

.login-box a:hover::after {
  width: 100%;
}

/* ==================== 隐藏/显示 ==================== */
.hidden { display: none !important; }

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
  .app-header { 
    padding: 0 16px;
    height: 60px;
  }
  .app-header h1 { font-size: 18px; }
  .app-header .nav button { 
    padding: 8px 12px; 
    font-size: 12px;
  }
  .main-content { padding: 16px; }
  .form-row, .form-row-3 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .time-slots { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); }
  .login-box { 
    padding: 32px 24px;
    max-width: 100%;
    margin: 16px;
  }
  .login-box h2 {
    font-size: 24px;
  }
}

/* ==================== 空状态 ==================== */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--gray-500);
}

.empty-state .icon { 
  font-size: 56px; 
  margin-bottom: 16px;
  opacity: 0.8;
  animation: float 3s ease-in-out infinite;
}

.empty-state p { 
  font-size: 16px;
  font-weight: 500;
}

/* ==================== 场地卡片 ==================== */
.venue-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.venue-card {
  background: white;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.venue-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--neon-purple));
  opacity: 0;
  transition: opacity 0.3s;
}

.venue-card:hover { 
  border-color: var(--primary);
  box-shadow: 0 20px 40px -12px rgba(99,102,241,0.25);
  transform: translateY(-4px);
}

.venue-card:hover::before {
  opacity: 1;
}

.venue-card.selected { 
  border-color: var(--primary);
  background: linear-gradient(135deg, var(--primary-light) 0%, rgba(99,102,241,0.1) 100%);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.2), 0 20px 40px -12px rgba(99,102,241,0.3);
}

.venue-card.selected::before {
  opacity: 1;
}

.venue-card h3 { 
  font-size: 18px; 
  margin-bottom: 12px;
  color: var(--gray-900);
  font-weight: 700;
}

.venue-card .info { 
  font-size: 14px; 
  color: var(--gray-600);
  line-height: 1.8;
}

.venue-card .info span { 
  display: inline-block; 
  margin-right: 16px;
}

.venue-card .type-badge {
  display: inline-block;
  padding: 4px 12px;
  background: linear-gradient(135deg, var(--primary-light) 0%, rgba(99,102,241,0.15) 100%);
  color: var(--primary-dark);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ==================== Tab 切换 ==================== */
.tabs { 
  display: flex; 
  gap: 0; 
  border-bottom: 2px solid var(--gray-200); 
  margin-bottom: 24px;
  background: var(--gray-50);
  padding: 4px;
  border-radius: var(--radius) var(--radius) 0 0;
}

.tab {
  padding: 12px 24px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-500);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.tab::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--neon-purple));
  transition: all 0.3s;
  transform: translateX(-50%);
}

.tab:hover { 
  color: var(--primary);
  background: rgba(99,102,241,0.05);
}

.tab:hover::before {
  width: 80%;
}

.tab.active { 
  color: var(--primary);
  background: rgba(99,102,241,0.1);
}

.tab.active::before {
  width: 100%;
}