* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #1a1a2e;
  --accent: #e94560;
  --bg: #f8f9fa;
  --white: #ffffff;
  --text: #1a1a2e;
  --text-light: #6c757d;
  --border: #e9ecef;
  --success: #28a745;
  --warning: #fd7e14;
}
body { font-family: -apple-system, BlinkMacSystemFont, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; padding-bottom: 70px; }
.header { background: var(--white); color: var(--text); padding: 12px 16px; position: sticky; top: 0; z-index: 100; display: flex; align-items: center; gap: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
.header h1 { font-size: 16px; font-weight: 600; flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.header-refresh { background: transparent; border: none; color: var(--accent); font-size: 15px; padding: 6px 12px; border-radius: 16px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: background 0.2s; font-weight: 500; }
.header-refresh:active { background: var(--bg); }
.header-btn-text { background: transparent; border: none; color: var(--text-light); font-size: 15px; cursor: pointer; padding: 6px 10px; border-radius: 4px; text-decoration: underline; }
.header-btn-text:active { background: var(--bg); }
.header-actions { display: flex; gap: 8px; }
.header-btn { background: var(--bg); border: none; color: var(--text); font-size: 15px; padding: 8px 14px; border-radius: 20px; cursor: pointer; font-weight: 500; }
.header-btn.primary { background: var(--accent); color: white; }
.subscription-badge { font-size: 13px; padding: 3px 8px; border-radius: 10px; font-weight: 500; cursor: pointer; margin-left: 4px; white-space: nowrap; }
.subscription-badge.trial { background: #e8f5e9; color: #2e7d32; }
.subscription-badge.warning { background: #fff3e0; color: #e65100; }
.subscription-badge.expired { background: #ffebee; color: #c62828; }
.subscription-badge.paid { background: #e3f2fd; color: #1565c0; }
.tab-bar { position: fixed; bottom: 0; left: 0; right: 0; background: var(--white); display: flex; border-top: 1px solid var(--border); z-index: 100; padding-bottom: env(safe-area-inset-bottom, 0); }
.tab-item { flex: 1; text-align: center; padding: 10px 0; font-size: 13px; color: var(--text-light); cursor: pointer; text-decoration: none; }
.tab-item.active { color: var(--accent); }
.tab-item span { display: block; font-size: 22px; margin-bottom: 4px; }
.tab-item-ai { color: var(--accent) !important; font-weight: 600; }
.tab-item-ai span { color: var(--accent); }
.page { display: none; padding: 16px; }
.page.active { display: block; }
.login-page.active { display: flex; }
.card { background: var(--white); border-radius: 16px; padding: 20px; margin-bottom: 16px; }
.card-title { font-size: 15px; font-weight: 600; margin-bottom: 16px; color: var(--text); display: flex; justify-content: space-between; align-items: center; letter-spacing: -0.01em; }
.card-title button { background: var(--accent); color: white; border: none; padding: 8px 16px; border-radius: 20px; font-size: 15px; font-weight: 500; cursor: pointer; }
.card-title small { font-size: 14px; color: var(--text-light); font-weight: normal; }
.input-group { margin-bottom: 16px; }
.input-group label { font-size: 15px; color: var(--text-light); display: block; margin-bottom: 6px; font-weight: 500; }
.input-group input, .input-group select, .input-group textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 12px; font-size: 15px; outline: none; background: var(--bg); transition: border-color 0.2s; }
.input-group input:focus, .input-group select:focus, .input-group textarea:focus { border-color: var(--accent); background: var(--white); }
.input-group textarea { resize: vertical; min-height: 80px; }
.btn { width: 100%; padding: 14px; border: none; border-radius: 12px; font-size: 15px; font-weight: 600; cursor: pointer; transition: transform 0.1s, opacity 0.2s; }
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: white; }
.btn-success { background: var(--success); color: white; }
.btn-secondary { background: var(--bg); color: var(--text); }
.btn-outline { background: white; color: var(--text); border: 1px solid var(--border); }
/* Date Selector */
.date-selector { background: var(--white); border-radius: 16px; padding: 20px; margin-bottom: 16px; }
.date-nav { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.date-nav-btn { background: var(--bg); border: none; width: 36px; height: 36px; border-radius: 50%; font-size: 18px; cursor: pointer; color: var(--text); }
.date-nav-btn:active { background: var(--border); }
.date-display { text-align: center; }
.date-display .date-str { font-size: 17px; font-weight: 600; color: var(--text); }
.date-display .week-str { font-size: 15px; color: var(--text-light); margin-top: 4px; }
.week-days { display: flex; gap: 8px; justify-content: center; }
.day-btn { min-width: 44px; text-align: center; padding: 10px 6px; border-radius: 12px; cursor: pointer; background: var(--white); border: 1px solid var(--border); flex-shrink: 0; transition: all 0.2s; }
.day-btn:active { transform: scale(0.95); }
.day-btn .day-name { font-size: 13px; color: var(--text-light); }
.day-btn .day-num { font-size: 16px; font-weight: 600; margin-top: 4px; }
.day-btn.today { border-color: var(--accent); }
.day-btn.selected { background: var(--accent); color: white; border-color: var(--accent); }
.day-btn.selected .day-name { color: rgba(255,255,255,0.75); }
.cal-btn { display: block; width: 100%; margin-top: 16px; padding: 12px; background: var(--bg); border: none; border-radius: 12px; font-size: 14px; color: var(--text-light); cursor: pointer; }
.cal-btn:active { background: var(--border); }
/* Calendar Popup */
.cal-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.4); display: none; align-items: center; justify-content: center; z-index: 300; padding: 20px; }
.cal-overlay.show { display: flex; }
.cal-content { background: var(--white); border-radius: 20px; width: 100%; max-width: 340px; padding: 24px; }
.cal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.cal-header select { padding: 8px 12px; border: 1px solid var(--border); border-radius: 10px; font-size: 14px; }
.cal-close { width: 32px; height: 32px; border-radius: 50%; background: var(--bg); border: none; font-size: 20px; cursor: pointer; color: var(--text-light); }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; margin-bottom: 12px; }
.cal-weekday { text-align: center; font-size: 13px; color: var(--text-light); padding: 8px 0; font-weight: 500; }
.cal-day { text-align: center; padding: 10px 4px; font-size: 14px; border-radius: 50%; cursor: pointer; }
.cal-day:active { background: var(--bg); }
.cal-day.today { border: 1px solid var(--accent); }
.cal-day.selected { background: var(--accent); color: white; }
.cal-day.other-month { color: #ccc; }
/* List */
.list-item { display: flex; justify-content: space-between; align-items: flex-start; padding: 16px 0; border-bottom: 1px solid var(--border); }
.list-item:last-child { border-bottom: none; }
.list-item h4 { font-size: 15px; margin-bottom: 4px; font-weight: 500; }
.list-item p { font-size: 15px; color: var(--text-light); }
.status-tag { display: inline-block; padding: 4px 10px; border-radius: 20px; font-size: 14px; font-weight: 500; }
.status-已约 { background: #e3f2fd; color: #1976d2; }
.status-已消课 { background: #e8f5e9; color: #388e3c; }
.status-已取消 { background: var(--bg); color: #999; }
.clickable-card { cursor: pointer; transition: transform 0.15s; }
.clickable-card:active { transform: scale(0.98); }
.empty-state { text-align: center; }
.empty-state span { font-size: 40px; display: block; margin-bottom: 8px; }
.loading-state { text-align: center; padding: 32px; color: var(--text-light); font-size: 14px; }
.error-state { text-align: center; padding: 32px; color: var(--accent); font-size: 14px; }
.error-state span { font-size: 30px; display: block; margin-bottom: 8px; }
/* Toast */
.toast { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: rgba(26,26,46,0.95); color: white; padding: 20px 40px; border-radius: 16px; font-size: 16px; z-index: 10000; opacity: 0; transition: opacity 0.3s; pointer-events: none; text-align: center; max-width: 80%; }
.toast.show { opacity: 1; }
.toast.error { background: var(--accent); box-shadow: 0 8px 30px rgba(233,69,96,0.4); }
.toast.success { background: var(--success); }
/* Modal */
.modal { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.4); display: none; align-items: center; justify-content: center; z-index: 200; padding: 20px; }
.modal.active { display: flex; }
.modal-content { background: var(--white); border-radius: 20px; width: 100%; max-width: 380px; max-height: 85vh; overflow-y: auto; padding: 24px; }
.modal-header { font-size: 17px; font-weight: 600; margin-bottom: 20px; display: flex; justify-content: space-between; align-items: center; }
.modal-close { width: 32px; height: 32px; border-radius: 50%; background: var(--bg); border: none; font-size: 20px; cursor: pointer; color: var(--text-light); }
/* Role Select */
.role-item { display: flex; align-items: center; padding: 16px; border-radius: 12px; background: var(--bg); margin-bottom: 12px; cursor: pointer; transition: background 0.2s; }
.role-item:active { background: var(--border); }
.role-icon { font-size: 28px; margin-right: 14px; }
.role-info { flex: 1; }
.role-name { font-size: 16px; font-weight: 600; color: var(--text); display: block; }
.role-label { font-size: 15px; color: var(--text-light); display: block; margin-top: 2px; }
.role-arrow { font-size: 22px; color: var(--text-light); }
/* Stats Overview */
.stats-overview { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 16px; }
.stats-overview .stat-card { background: var(--white); border-radius: 16px; padding: 20px 16px; text-align: center; }
.stats-overview .stat-card .num { font-size: 28px; font-weight: 700; }
.stats-overview .stat-card .num.accent { color: var(--accent); }
.stats-overview .stat-card .num.success { color: var(--success); }
.stats-overview .stat-card .num.warning { color: var(--warning); }
.stats-overview .stat-card .label { font-size: 14px; color: var(--text-light); margin-top: 6px; font-weight: 500; }
/* Member */
.member-item { display: flex; justify-content: space-between; align-items: center; padding: 16px; border-radius: 0; margin-bottom: 0; background: transparent; }
.member-item:nth-child(odd) { background: transparent; }
.member-item:nth-child(even) { background: transparent; }
.member-item:hover { background: var(--bg); }
.member-info h4 { font-size: 15px; margin-bottom: 2px; font-weight: 500; }
.member-info p { font-size: 15px; color: var(--text-light); }
.member-courses { text-align: right; }
.member-courses .num { font-size: 22px; font-weight: 700; color: var(--accent); }
.member-courses .label { font-size: 13px; color: var(--text-light); }
.action-btns { display: flex; gap: 8px; margin-top: 10px; justify-content: flex-end; }
.action-btn { padding: 6px 12px; border: none; border-radius: 8px; font-size: 14px; cursor: pointer; font-weight: 500; }
.action-btn.primary { background: #e3f2fd; color: #1976d2; }
.action-btn.warning { background: #fff3e0; color: #f57c00; }
.action-btn.danger { background: #ffebee; color: #c62828; }
.course-tag { display: inline-block; background: var(--bg); padding: 4px 10px; border-radius: 6px; font-size: 14px; margin-right: 6px; margin-bottom: 4px; }
/* Quick Actions */
.quick-actions { display: flex; gap: 12px; margin-bottom: 16px; }
.quick-btn { flex: 1; padding: 16px; background: var(--white); border: none; border-radius: 14px; font-size: 14px; font-weight: 500; cursor: pointer; color: var(--text); }
.quick-btn:active { transform: scale(0.98); }
/* Login */
.login-page { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; background: url('/Index.jpg') no-repeat center center fixed; background-size: cover; }
.login-logo { position: fixed; bottom: 60px; left: 50%; transform: translateX(-50%); width: 120px; height: auto; }
.login-title { font-size: 26px; font-weight: 700; margin-bottom: 8px; color: var(--text); text-align: center; }
.login-subtitle { font-size: 14px; color: var(--text-light); margin-bottom: 40px; text-align: center; }
.login-form { width: 100%; max-width: 320px; }
.login-form .input-group input { background: var(--bg); border: 1px solid var(--border); color: var(--text); }
.login-form .input-group input::placeholder { color: var(--text-light); }
.login-form .btn { margin-top: 20px; }
/* Info box */
.info-box { background: var(--bg); border-radius: 12px; padding: 14px; margin-bottom: 14px; font-size: 15px; line-height: 1.5; }
/* Settings menu */
.settings-menu { background: var(--white); border-radius: 16px; overflow: hidden; }
.settings-item { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border); cursor: pointer; }
.settings-item:last-child { border-bottom: none; }
.settings-item:active { background: var(--bg); }
.settings-item .icon { font-size: 20px; margin-right: 12px; }
.settings-item .label { font-size: 15px; font-weight: 500; }
.settings-item .arrow { color: var(--text-light); font-size: 14px; }
/* Section header */
.section-header { font-size: 15px; color: var(--text-light); font-weight: 500; margin-bottom: 10px; padding-left: 4px; text-transform: uppercase; letter-spacing: 0.5px; }
/* Detail tab btn */
.detail-tab-btn { display: flex; background: var(--bg); border-radius: 10px; padding: 4px; margin-bottom: 16px; }
.detail-tab-btn .tab-btn { flex: 1; padding: 8px; text-align: center; font-size: 15px; border-radius: 8px; cursor: pointer; color: var(--text-light); }
.detail-tab-btn .tab-btn.active { background: var(--white); color: var(--text); font-weight: 500; }
/* Utility */
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }