:root {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --border-focus: #3b82f6;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-light: #eff6ff;
    --accent-border: #bfdbfe;
    --success: #10b981;
    --success-bg: #ecfdf5;
    --success-border: #a7f3d0;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --warning-border: #fde68a;
    --purple: #8b5cf6;
    --purple-bg: #f5f3ff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 14px;
}

[data-theme="dark"] {
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --border-color: #334155;
    --border-focus: #60a5fa;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --accent-light: rgba(59, 130, 246, 0.15);
    --accent-border: rgba(59, 130, 246, 0.3);
    --success: #34d399;
    --success-bg: rgba(16, 185, 129, 0.15);
    --success-border: rgba(16, 185, 129, 0.3);
    --warning: #fbbf24;
    --warning-bg: rgba(245, 158, 11, 0.15);
    --warning-border: rgba(245, 158, 11, 0.3);
    --purple: #a78bfa;
    --purple-bg: rgba(139, 92, 246, 0.15);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.4);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    padding-bottom: 50px;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.stats-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(8px);
    background-color: rgba(var(--bg-card), 0.95);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-icon {
    width: 38px;
    height: 38px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--accent) 0%, var(--purple) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

.brand-title {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-badge {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
}

.brand-sub {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.pulse-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    font-size: 0.82rem;
    font-weight: 600;
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
    border-radius: 999px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    animation: pulse-ring 1.8s infinite;
}

@keyframes pulse-ring {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 7px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Range Filter Pills */
.filter-bar {
    display: flex;
    background: var(--bg-main);
    padding: 3px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    gap: 2px;
}

.range-btn {
    border: none;
    background: transparent;
    padding: 6px 13px;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.range-btn:hover {
    color: var(--text-primary);
}

.range-btn.active {
    background: var(--bg-card);
    color: var(--accent);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

/* Nav Action Buttons */
.btn-nav {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-nav:hover {
    border-color: var(--border-focus);
    color: var(--accent);
}

.btn-nav.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.btn-nav.primary:hover {
    background: var(--accent-hover);
}

.theme-toggle {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
}

.theme-toggle:hover {
    color: var(--text-primary);
}

/* KPI Cards Grid */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent);
    opacity: 0.7;
}

.kpi-card.green::before { background: var(--success); }
.kpi-card.purple::before { background: var(--purple); }
.kpi-card.orange::before { background: var(--warning); }

.kpi-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.kpi-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
}

.kpi-icon {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-sm);
    background: var(--accent-light);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
}

.kpi-card.green .kpi-icon {
    background: var(--success-bg);
    color: var(--success);
}
.kpi-card.purple .kpi-icon {
    background: var(--purple-bg);
    color: var(--purple);
}
.kpi-card.orange .kpi-icon {
    background: var(--warning-bg);
    color: var(--warning);
}

.kpi-value {
    font-size: 1.9rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    line-height: 1.2;
}

.kpi-sub {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Analytics Content Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
}

.col-12 { grid-column: span 12; }
.col-8  { grid-column: span 8; }
.col-6  { grid-column: span 6; }
.col-4  { grid-column: span 4; }

@media (max-width: 1024px) {
    .col-8, .col-6, .col-4 {
        grid-column: span 12;
    }
}

/* Cards */
.dash-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
    gap: 12px;
}

.card-title-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-title-icon {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    background: var(--accent-light);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-title {
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.card-subtitle {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.card-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-tab-btn {
    border: none;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.76rem;
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 500;
}

.card-tab-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* Charts */
.chart-container {
    position: relative;
    width: 100%;
    min-height: 220px;
}

.svg-chart {
    width: 100%;
    height: 100%;
    overflow: visible;
}

.chart-line {
    fill: none;
    stroke: var(--accent);
    stroke-width: 2.5;
    stroke-linejoin: round;
    stroke-linecap: round;
}

.chart-line-secondary {
    fill: none;
    stroke: var(--purple);
    stroke-width: 2;
    stroke-dasharray: 4,4;
}

.chart-area {
    fill: url(#accentGradient);
    opacity: 0.3;
}

.chart-grid-line {
    stroke: var(--border-color);
    stroke-dasharray: 2, 2;
    stroke-width: 1;
}

.chart-axis-text {
    font-size: 11px;
    fill: var(--text-muted);
}

.chart-point {
    fill: var(--bg-card);
    stroke: var(--accent);
    stroke-width: 2.5;
    cursor: pointer;
    transition: r 0.15s ease;
}

.chart-point:hover {
    r: 6;
}

.chart-legend {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 10px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.legend-color {
    width: 10px;
    height: 10px;
    border-radius: 2px;
}

/* Horizontal Bar Rankings */
.ranking-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ranking-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ranking-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.84rem;
}

.ranking-name {
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ranking-count {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.8rem;
}

.ranking-bar-bg {
    height: 8px;
    background: var(--bg-main);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.ranking-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, var(--purple) 100%);
    border-radius: 4px;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.ranking-bar-fill.green {
    background: linear-gradient(90deg, #10b981 0%, #34d399 100%);
}
.ranking-bar-fill.orange {
    background: linear-gradient(90deg, #f59e0b 0%, #fbbf24 100%);
}

/* Tables */
.dash-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.84rem;
}

.dash-table th {
    text-align: left;
    padding: 8px 12px;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-main);
    font-size: 0.76rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.dash-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.dash-table tr:last-child td {
    border-bottom: none;
}

.dash-table tr:hover td {
    background: var(--accent-light);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.74rem;
    font-weight: 600;
}

.badge.blue {
    background: var(--accent-light);
    color: var(--accent);
}
.badge.green {
    background: var(--success-bg);
    color: var(--success);
}
.badge.orange {
    background: var(--warning-bg);
    color: var(--warning);
}

/* Empty State */
.empty-state {
    padding: 36px 16px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.88rem;
}

.empty-state i {
    width: 32px;
    height: 32px;
    margin-bottom: 8px;
    opacity: 0.6;
}

/* Footer Notice */
.privacy-footer {
    margin-top: 40px;
    padding: 18px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.privacy-notice {
    display: flex;
    align-items: center;
    gap: 10px;
}

.privacy-shield {
    color: var(--success);
}

/* Responsive tweaks */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }
    .header-controls {
        width: 100%;
        justify-content: space-between;
    }
    .filter-bar {
        overflow-x: auto;
        width: 100%;
    }
    .range-btn {
        padding: 5px 9px;
        font-size: 0.78rem;
        white-space: nowrap;
    }
}