*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --primary: #4e73df; --secondary: #1cc88a; --bg: #f8f9fc;
    --sidebar-bg: #fff; --header-bg: #fff; --text: #5a5c69;
    --border: #e3e6f0; --success: #1cc88a; --danger: #e74a3b;
    --warning: #f6c23e; --info: #36b9cc;
}
body { font-family: 'Segoe UI', Tahoma, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
.layout { display: flex; flex-direction: column; min-height: 100vh; }
.header { background: var(--header-bg); border-bottom: 1px solid var(--border); padding: 0 20px; position: sticky; top: 0; z-index: 100; }
.header-inner { display: flex; justify-content: space-between; align-items: center; height: 60px; max-width: 1400px; margin: 0 auto; }
.logo { font-size: 1.5rem; font-weight: 700; color: var(--primary); text-decoration: none; }
.header-nav a { margin-left: 20px; text-decoration: none; color: var(--text); font-weight: 500; }
.header-nav a:hover { color: var(--primary); }
.language-switcher { margin-left: 20px; padding: 4px 8px; border: 1px solid var(--border); border-radius: 4px; background: #fff; color: var(--text); font-size: 0.9rem; cursor: pointer; }
.layout-body { display: flex; flex: 1; max-width: 1400px; margin: 0 auto; width: 100%; }
.sidebar { width: 240px; background: var(--sidebar-bg); border-right: 1px solid var(--border); padding: 20px 0; flex-shrink: 0; }
.sidebar-nav { display: flex; flex-direction: column; }
.sidebar-nav a { padding: 10px 20px; text-decoration: none; color: var(--text); border-left: 3px solid transparent; }
.sidebar-nav a:hover, .sidebar-nav a.active { background: #f8f9fc; color: var(--primary); border-left-color: var(--primary); }
.sidebar-nav hr { margin: 10px 20px; border: none; border-top: 1px solid var(--border); }
.sidebar-group { display: flex; flex-direction: column; }
.sidebar-heading { font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.sidebar-heading::after { content: '▸'; font-size: 0.7rem; transition: transform 0.2s; }
.sidebar-group.expanded .sidebar-heading::after { transform: rotate(90deg); }
.sidebar-subs { display: none; }
.sidebar-group.expanded .sidebar-subs { display: block; }
.sidebar-sub { display: block; padding: 6px 20px 6px 32px !important; font-size: 0.9rem; }
.sidebar-nav .sidebar-link-heading { text-decoration: none; color: var(--text); padding: 10px 0; }
.sidebar-nav .sidebar-link-heading::after { display: none !important; }
.sidebar-nav .sidebar-link-heading:hover, .sidebar-nav .sidebar-link-heading.active { color: var(--primary); background: #f8f9fc; border-left: 3px solid var(--primary); padding-left: 17px; }
.sidebar-sub.active { color: var(--primary); border-left-color: var(--primary); background: #f8f9fc; }
.chart-wrapper, .table-wrapper { margin-bottom: 30px; width: 100%; flex: none; }
canvas { display: block; max-width: 100%; }
.main-content { flex: 1; padding: 30px; overflow-x: hidden; display: block; }
.charts-page, .compare-charts-page, .tables-page { display: block; }
.chart-container { display: block; background: #fff; border-radius: 8px; padding: 20px; margin-bottom: 20px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.footer { background: var(--header-bg); border-top: 1px solid var(--border); padding: 15px 20px; text-align: center; }
.dashboard-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.dashboard-header h1 { margin: 0; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin-bottom: 30px; }
.stat-card { background: #fff; border-radius: 8px; padding: 20px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.stat-card h3 { font-size: 0.85rem; text-transform: uppercase; color: #858796; margin-bottom: 8px; }
.stat-value { font-size: 1.8rem; font-weight: 700; color: var(--text); }
.chart-container h2 { margin-bottom: 15px; font-size: 1.2rem; }
.table-responsive { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.table th, .table td { padding: 12px 15px; text-align: left; border-bottom: 1px solid var(--border); }
.table th { background: #f8f9fc; font-weight: 600; color: #858796; text-transform: uppercase; font-size: 0.8rem; }
.table tr:hover { background: #f8f9fc; }
.alert { padding: 12px 20px; border-radius: 8px; margin-bottom: 20px; font-weight: 500; }
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-error { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alert-info { background: #d1ecf1; color: #0c5460; border: 1px solid #bee5eb; }
.demo-banner { display: block; width: 100%; background: #fff3cd; color: #856404; border-bottom: 2px solid #ffc107; padding: 10px 16px; text-align: center; font-weight: 700; font-size: 0.95rem; box-sizing: border-box; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 500; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 1rem; }
.form-row { display: flex; gap: 15px; flex-wrap: wrap; }
.form-row .form-group { flex: 1; min-width: 200px; }
.form-actions { margin-top: 20px; display: flex; gap: 10px; }
.btn { display: inline-block; padding: 10px 20px; border: 1px solid var(--border); border-radius: 6px; background: #fff; color: var(--text); text-decoration: none; cursor: pointer; font-size: 0.9rem; }
.btn:hover { background: #f8f9fc; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: #3a5cd4; }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.chart-controls, .compare-controls, .table-controls { display: flex; gap: 15px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 15px; padding: 15px; background: #fff; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.control-group { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.control-group label { font-size: 0.85rem; font-weight: 500; }
.period-group { padding: 10px; border: 1px solid var(--border); border-radius: 6px; }
.period-group h3 { font-size: 0.9rem; margin-bottom: 10px; }
.login-page { display: flex; justify-content: center; align-items: center; min-height: 60vh; }
.login-form { width: 400px; background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.login-form h1 { margin-bottom: 25px; text-align: center; }
.error-page { text-align: center; padding: 100px 20px; }
.error-page h1 { font-size: 5rem; color: var(--primary); }
.hamburger { display: none; font-size: 1.5rem; cursor: pointer; padding: 8px 12px; color: var(--text); line-height: 1; user-select: none; border-radius: 4px; }
.hamburger:hover { background: var(--border); }
.sidebar-overlay { display: none; }

@media (max-width: 768px) {
    .hamburger { display: block; }
    .header-inner .logo { font-size: 1.1rem; }
    .header-nav a { margin-left: 12px; font-size: 0.85rem; }
    .language-switcher { margin-left: 8px; font-size: 0.8rem; padding: 2px 6px; }
    .sidebar { display: block; position: fixed; top: 0; left: -280px; width: 260px; height: 100vh; z-index: 200; transition: left 0.25s ease; box-shadow: none; overflow-y: auto; }
    .sidebar-visible .sidebar { left: 0; box-shadow: 0 0 20px rgba(0,0,0,0.3); }
    .sidebar-visible .sidebar-overlay { display: block; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 199; }
    .main-content { padding: 15px; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .dashboard-header { flex-direction: column; align-items: flex-start; gap: 8px; }
    .dashboard-header h1 { font-size: 1.2rem; }
    .chart-container { padding: 12px; }
    .chart-container h2 { font-size: 1rem; }
    .stat-card { padding: 12px; }
    .stat-value { font-size: 1.3rem; }
    .table th, .table td { padding: 6px 8px; font-size: 0.8rem; }
    .login-form { width: 90%; max-width: 360px; padding: 25px; }
    .login-form h1 { font-size: 1.2rem; }
    .chart-controls, .compare-controls, .table-controls { flex-direction: column; gap: 8px; }
    .control-group { width: 100%; }
    .form-row { flex-direction: column; }
    .form-row .form-group { min-width: 100%; }
    .footer { padding: 10px 15px; font-size: 0.8rem; }
}
@media (min-width: 769px) and (max-width: 1024px) {
    .sidebar { width: 200px; }
    .sidebar-nav a { padding: 8px 15px; font-size: 0.85rem; }
    .main-content { padding: 20px; }
    .stats-grid { gap: 15px; }
    .chart-container { padding: 15px; }
}

.theme-toggle { cursor: pointer; font-size: 1.2rem; background: none; border: none; padding: 4px 8px; border-radius: 4px; color: var(--text); }
.theme-toggle:hover { background: var(--border); }

html.dark-mode body { --bg: #1a1d23; --sidebar-bg: #22262e; --header-bg: #22262e; --text: #d1d5db; --border: #374151; background: var(--bg); }
html.dark-mode .chart-container,
html.dark-mode .chart-controls,
html.dark-mode .compare-controls,
html.dark-mode .table-controls,
html.dark-mode .stat-card,
html.dark-mode .table,
html.dark-mode .login-form { background: #22262e; }
html.dark-mode .table th { background: #2a2f38; color: #9ca3af; }
html.dark-mode .table tr:hover { background: #2a2f38; }
html.dark-mode input, html.dark-mode select, html.dark-mode textarea,
html.dark-mode .btn { background: #2a2f38; color: var(--text); border-color: var(--border); }
html.dark-mode .btn:hover { background: #374151; }
html.dark-mode .language-switcher { background: #2a2f38; color: var(--text); }
html.dark-mode .sidebar-nav a:hover, html.dark-mode .sidebar-nav a.active,
html.dark-mode .sidebar-sub.active { background: #2a2f38; }
html.dark-mode .demo-banner { background: #664d03; color: #ffc107; border-color: #ffc107; }
.layout-compact .demo-banner { padding: 4px 12px; font-size: 0.8rem; }

.layout-compact .header { padding: 0 12px; }
.layout-compact .header-inner { height: 40px; }
.layout-compact .logo { font-size: 1.2rem; }
.layout-compact .sidebar { width: 200px; padding: 10px 0; }
.layout-compact .sidebar-nav a { padding: 6px 15px; font-size: 0.9rem; }
.layout-compact .sidebar-sub { padding: 4px 15px 4px 25px !important; font-size: 0.82rem; }
.layout-compact .main-content { padding: 15px; }
.layout-compact .chart-container { padding: 12px; margin-bottom: 12px; }
.layout-compact .chart-container h2 { font-size: 1rem; margin-bottom: 10px; }
.layout-compact .stats-grid { gap: 10px; margin-bottom: 15px; }
.layout-compact .stat-card { padding: 12px; }
.layout-compact .stat-value { font-size: 1.3rem; }
.layout-compact .table th, .layout-compact .table td { padding: 6px 8px; font-size: 0.85rem; }
.layout-compact .table th { font-size: 0.75rem; }
.layout-compact .chart-wrapper, .layout-compact .table-wrapper { margin-bottom: 15px; }
.layout-compact .chart-controls, .layout-compact .compare-controls, .layout-compact .table-controls { padding: 10px; margin-bottom: 10px; gap: 10px; }
.layout-compact .dashboard-header { margin-bottom: 12px; }
.layout-compact .dashboard-header h1 { font-size: 1.3rem; }
.layout-compact .alert { padding: 8px 15px; margin-bottom: 12px; }
.layout-compact .footer { padding: 8px 12px; font-size: 0.85rem; }
.layout-compact .form-group { margin-bottom: 10px; }
.layout-compact .form-group input, .layout-compact .form-group select, .layout-compact .form-group textarea { padding: 6px 10px; font-size: 0.9rem; }
.layout-compact .btn { padding: 6px 14px; font-size: 0.85rem; }
.layout-compact .control-group label { font-size: 0.8rem; }
.layout-compact .login-form { padding: 25px; }
.layout-compact .login-form h1 { font-size: 1.3rem; }

.skeleton-widget .stat-content { display: none; }
.skeleton-widget .skeleton-box {
    background: #e9ecef;
    border-radius: 4px;
    animation: skeleton-pulse 1.5s ease-in-out infinite;
}
html.dark-mode .skeleton-widget .skeleton-box {
    background: #374151;
}
@keyframes skeleton-pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}
.skeleton-widget.loaded .skeleton-box { display: none; }
.skeleton-widget.loaded .stat-content {
    display: block;
    animation: skeleton-fade-in 0.35s ease-out forwards;
}
.skeleton-chart {
    min-height: 300px;
    background: #e9ecef;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
}
html.dark-mode .skeleton-chart {
    background: #374151;
}
.skeleton-chart::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.3) 50%, transparent 100%);
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
}
html.dark-mode .skeleton-chart::after {
    background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.06) 50%, transparent 100%);
}
@keyframes skeleton-shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}
.skeleton-chart.loaded {
    background: none;
    min-height: 0;
}
.skeleton-chart.loaded::after { display: none; }
.js .skeleton-fade {
    opacity: 0;
    animation: skeleton-fade-in 0.4s ease-out forwards;
}
@keyframes skeleton-fade-in {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}
.help-tip {
    display: inline-flex; align-items: center; justify-content: center;
    cursor: help; position: relative; font-size: 14px; color: var(--info);
    margin-left: 4px; vertical-align: middle; user-select: none;
}
.help-tip .help-text {
    visibility: hidden; opacity: 0; transition: opacity 0.15s, visibility 0.15s;
    position: absolute; z-index: 99999;
    bottom: calc(100% + 8px); left: 50%; transform: translateX(-50%);
    background: #333; color: #fff; font-size: 0.78rem; line-height: 1.35;
    padding: 6px 10px; border-radius: 5px;
    max-width: 260px; white-space: nowrap; text-align: left;
    font-weight: 400; box-shadow: 0 3px 10px rgba(0,0,0,0.3);
    pointer-events: none;
    white-space: normal;
}
.help-tip:hover .help-text,
.help-tip:focus .help-text,
.help-tip:focus-within .help-text {
    visibility: visible; opacity: 1;
}
.help-tip .help-text::after {
    content: ''; position: absolute; top: 100%; left: 50%;
    transform: translateX(-50%); border: 5px solid transparent;
    border-top-color: #333;
}
html.dark-mode .help-tip .help-text { background: #444; }
html.dark-mode .help-tip .help-text::after { border-top-color: #444; }
html.dark-mode #weatherGeocodeInput { background: #2a2f38; color: var(--text); border-color: var(--border); }
html.dark-mode .config-item[style*="background:#f8f9fc"] { background: #22262e !important; }

.weather-widget { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.weather-main { display: flex; align-items: center; gap: 16px; }
.weather-icon { color: var(--warning); display: flex; align-items: center; }
.weather-temp { display: flex; flex-direction: column; }
.weather-temp-value { font-size: 2.2rem; font-weight: 700; line-height: 1; color: var(--text); }
.weather-desc { font-size: 0.85rem; color: #858796; margin-top: 2px; }
.weather-details { display: flex; gap: 16px; flex-wrap: wrap; }
.weather-detail { display: flex; align-items: center; gap: 4px; font-size: 0.85rem; color: #858796; white-space: nowrap; }
html.dark-mode .weather-icon { color: #f6c23e; }
html.dark-mode .weather-temp-value { color: var(--text); }
html.dark-mode .weather-desc,
html.dark-mode .weather-detail { color: #9ca3af; }
.layout-compact .weather-temp-value { font-size: 1.6rem; }
.layout-compact .weather-icon svg { width: 28px; height: 28px; }
.layout-compact .weather-details { gap: 10px; }
.layout-compact .weather-detail { font-size: 0.8rem; }