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

:root {
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --primary-dark: #4338ca;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --sidebar-width: 240px;
    --sidebar-collapsed: 64px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--gray-100);
    color: var(--gray-800);
    height: 100vh;
    overflow: hidden;
}

#app { display: flex; height: 100vh; }

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--gray-900);
    color: var(--gray-300);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width 0.3s ease;
}
.sidebar.collapsed { width: var(--sidebar-collapsed); }
.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--gray-700);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.sidebar-header h2 {
    font-size: 18px;
    color: #fff;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
}
.sidebar.collapsed .sidebar-header h2 { display: none; }
.sidebar-toggle {
    background: var(--gray-800);
    border: none;
    color: var(--gray-400);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
    transition: all 0.2s;
}
.sidebar-toggle:hover { color: #fff; background: var(--primary); }
.sidebar-nav { padding: 12px 0; flex: 1; overflow-y: auto; }
.nav-item {
    display: block;
    padding: 12px 20px;
    color: var(--gray-400);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
    border-left: 3px solid transparent;
    white-space: nowrap;
    overflow: hidden;
}
.nav-item:hover { color: #fff; background: var(--gray-800); }
.nav-item.active {
    color: #fff;
    background: var(--gray-800);
    border-left-color: var(--primary-light);
}
.sidebar.collapsed .nav-item { padding: 12px 0; text-align: center; }
.sidebar.collapsed .nav-item span { display: none; }

.nav-group-toggle { cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.nav-arrow { font-size: 10px; transition: transform 0.2s; margin-left: auto; padding-left: 8px; }
.nav-group.open .nav-arrow { transform: rotate(90deg); }
.nav-submenu { display: none; }
.nav-group.open .nav-submenu { display: block; }
.nav-sub { padding-left: 36px !important; font-size: 13px; }

.tab-bar { display: flex; gap: 6px; background: var(--gray-100); padding: 8px 12px 0; border-bottom: 1px solid var(--gray-200); flex-shrink: 0; }
.tab-item { display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px; font-size: 13px; color: var(--gray-500); background: var(--gray-200); border-radius: 8px 8px 0 0; cursor: pointer; white-space: nowrap; transition: all 0.2s ease; border: 1px solid transparent; }
.tab-item:hover { color: var(--gray-700); background: #fff; }
.tab-item.active { color: #fff; background: var(--primary); font-weight: 600; border: 1px solid var(--primary); box-shadow: 0 2px 8px rgba(79,70,229,0.3); }
.tab-close { display: inline-flex; align-items: center; justify-content: center; width: 16px; height: 16px; border-radius: 50%; font-size: 14px; color: var(--gray-400); line-height: 1; transition: all 0.15s; }
.tab-close:hover { color: #fff; background: var(--danger); }
.tab-item.active .tab-close { color: rgba(255,255,255,0.7); }
.tab-item.active .tab-close:hover { color: #fff; background: rgba(255,255,255,0.3); }

/* Content */
.content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.content-header {
    background: #fff;
    padding: 14px 24px;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.content-header h1 { font-size: 20px; font-weight: 600; color: var(--gray-900); }
.header-meeting-selector { display: flex; align-items: center; gap: 8px; }
.header-meeting-selector label { font-size: 13px; color: var(--gray-500); white-space: nowrap; }
.header-meeting-selector select {
    padding: 6px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 20px;
    font-size: 13px;
    background: var(--gray-50);
    cursor: pointer;
    min-width: 160px;
}
.page-content { flex: 1; padding: 20px; overflow-y: auto; }

/* Cards */
.card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    padding: 18px;
    margin-bottom: 16px;
}
.card-title { font-size: 15px; font-weight: 600; margin-bottom: 14px; color: var(--gray-900); }

/* Stats cards */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 20px; }
.stat-card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    border-left: 4px solid var(--primary);
}
.stat-card.success { border-left-color: var(--success); }
.stat-card.warning { border-left-color: var(--warning); }
.stat-card.info { border-left-color: var(--info); }
.stat-card.danger { border-left-color: var(--danger); }
.stat-card .stat-label { font-size: 13px; color: var(--gray-500); margin-bottom: 6px; }
.stat-card .stat-value { font-size: 26px; font-weight: 700; color: var(--gray-900); }
.stat-card .stat-unit { font-size: 14px; color: var(--gray-500); margin-left: 4px; }

/* Tables - compact mode */
.table-wrap { overflow-x: auto; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
table { width: 100%; border-collapse: collapse; font-size: 13px; background: #fff; }
th { text-align: left; padding: 10px 12px; background: linear-gradient(180deg, #f9fafb, #f3f4f6); color: var(--gray-600); font-weight: 600; border-bottom: 2px solid var(--gray-200); white-space: nowrap; position: sticky; top: 0; z-index: 1; }
.stats-section th { text-align: center; }
th:first-child { border-top-left-radius: 8px; }
th:last-child { border-top-right-radius: 8px; }
td { padding: 9px 12px; border-bottom: 1px solid var(--gray-100); color: var(--gray-700); transition: background 0.15s ease; white-space: nowrap; }
tbody tr:nth-child(even) td { background: #f9fafb; }
tbody tr:hover td { background: #e0e7ff; }
tbody tr:last-child td { border-bottom: none; }
td:first-child { font-weight: 500; color: var(--gray-500); }
.filter-row th { padding: 4px 6px; background: #f3f4f6; border-bottom: 1px solid var(--gray-200); }
.filter-input { width: 100%; padding: 3px 6px; font-size: 12px; border: 1px solid var(--gray-200); border-radius: 4px; background: #fff; color: var(--gray-600); }
.filter-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 2px rgba(79,70,229,0.1); }

/* Buttons - rounded style */
.btn {
    display: inline-block;
    padding: 8px 18px;
    border: none;
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    white-space: nowrap;
    font-weight: 500;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 2px 8px rgba(79,70,229,0.3); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 2px 8px rgba(16,185,129,0.3); }
.btn-warning { background: var(--warning); color: #fff; }
.btn-warning:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 2px 8px rgba(239,68,68,0.3); }
.btn-default { background: var(--gray-200); color: var(--gray-700); }
.btn-default:hover { background: var(--gray-300); }
.btn-sm { padding: 4px 12px; font-size: 12px; border-radius: 16px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Forms - rounded style */
.form-group { margin-bottom: 14px; }
.form-group label { display: block; margin-bottom: 5px; font-size: 13px; font-weight: 500; color: var(--gray-700); }
.form-control {
    width: 100%;
    padding: 8px 14px;
    border: 1px solid var(--gray-300);
    border-radius: 10px;
    font-size: 14px;
    transition: all 0.2s;
    background: var(--gray-50);
}
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.1); background: #fff; }
.form-row { display: flex; gap: 14px; }
.form-row .form-group { flex: 1; }

/* Badges */
.badge { display: inline-block; padding: 2px 10px; border-radius: 12px; font-size: 12px; font-weight: 500; }
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #dbeafe; color: #1e40af; }
.badge-primary { background: #ede9fe; color: #6d28d9; }
.badge-default { background: var(--gray-100); color: var(--gray-600); }

/* Toolbar */
.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; gap: 12px; flex-wrap: wrap; }
.toolbar-left { display: flex; gap: 10px; align-items: center; flex: 1; }
.search-box { padding: 8px 14px; border: 1px solid var(--gray-300); border-radius: 20px; font-size: 13px; min-width: 200px; background: var(--gray-50); }
.search-box:focus { outline: none; border-color: var(--primary); background: #fff; }

/* Select meeting */
.meeting-select-wrap { margin-bottom: 16px; }
.meeting-select-wrap label { display: block; margin-bottom: 5px; font-size: 13px; font-weight: 500; }

/* Modal - rounded */
.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;
    backdrop-filter: blur(2px);
}
.modal {
    background: #fff; border-radius: 16px; padding: 24px;
    width: 500px; max-width: 90vw; max-height: 90vh; overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    margin: auto;
}
.modal-title { font-size: 18px; font-weight: 600; margin-bottom: 20px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 24px; }
.edit-form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 20px; }
.edit-form-grid .form-group { margin-bottom: 0; }
.edit-form-grid .form-group label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 600; color: #374151; }
.edit-form-grid .form-group .form-control { width: 100%; padding: 8px 12px; font-size: 14px; }

/* Toast */
#toast-container { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 2000; display: flex; flex-direction: column; align-items: center; }
.toast {
    background: #fff; border-radius: 10px; padding: 12px 20px;
    margin-bottom: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border-left: 4px solid var(--primary); font-size: 14px; min-width: 250px;
    animation: toastFadeIn 0.3s ease;
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }
@keyframes toastFadeIn { from { transform: scale(0.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* Seat grid */
.seat-grid { display: grid; grid-template-columns: repeat(10, 1fr); gap: 8px; max-width: 800px; }
.seat {
    aspect-ratio: 1;
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 12px; font-weight: 500; cursor: pointer; transition: all 0.2s;
    border: 2px solid transparent;
}
.seat.empty { background: var(--gray-100); color: var(--gray-400); }
.seat.occupied { background: #dbeafe; color: #1e40af; border-color: var(--info); }
.seat.occupied:hover { background: var(--info); color: #fff; }
.seat.selected { background: var(--primary); color: #fff; border-color: var(--primary-dark); }
.seat-stage { grid-column: 1 / -1; background: var(--gray-800); color: #fff; padding: 12px; text-align: center; border-radius: 8px; margin-bottom: 8px; }

/* Empty state */
.empty-state { text-align: center; padding: 48px 20px; color: var(--gray-400); }
.empty-state h3 { font-size: 18px; margin-bottom: 8px; }

/* Meeting detail */

.meeting-detail-header {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}
.meeting-detail-info { display: flex; gap: 24px; flex-wrap: wrap; align-items: center; }
.meeting-detail-info h2 { font-size: 20px; font-weight: 700; color: var(--gray-900); }
.meeting-detail-info .meta { font-size: 13px; color: var(--gray-500); }

/* Tabs */
.tab-bar {
    display: flex;
    gap: 4px;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: 16px;
    flex-wrap: wrap;
}
.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    font-size: 14px;
    color: var(--gray-500);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
    border-radius: 8px 8px 0 0;
    font-weight: 500;
}
.tab-btn:hover { color: var(--primary); background: var(--gray-50); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Sticky table headers in meeting detail */
.meeting-detail-page .table-wrap {
    overflow-y: auto !important;
}
.meeting-detail-page .table-wrap table {
    border-collapse: separate !important;
    border-spacing: 0;
}
.meeting-detail-page .table-wrap thead {
    position: sticky;
    top: 0;
    z-index: 2;
    background: #fff;
    box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

/* Back button */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 20px;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 13px;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}
.back-btn:hover { background: var(--gray-200); color: var(--gray-800); }

/* Room blocks */
.room-grid { display: flex; flex-wrap: wrap; gap: 12px; }
.room-block { position: relative; text-align: center; width: 72px; height: 72px; border-radius: 12px; cursor: pointer; transition: all 0.2s; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.room-block:hover { transform: scale(1.08); z-index: 10; box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.room-block .room-num { font-weight: 700; font-size: 15px; }
.room-block .room-type-label { font-size: 11px; color: #6b7280; margin-top: 2px; }
.room-tip { position: fixed; background: #1f2937; color: #fff; padding: 8px 12px; border-radius: 6px; font-size: 12px; z-index: 9999; box-shadow: 0 2px 8px rgba(0,0,0,0.3); pointer-events: none; max-width: 250px; }

/* Responsive */
@media (max-width: 768px) {
    :root { --sidebar-width: 60px; }
    .sidebar-header h2 { display: none; }
    .nav-item { padding: 12px; text-align: center; font-size: 0; }
    .nav-item::first-letter { font-size: 14px; }
    .header-meeting-selector { display: none; }
}
@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}