:root {
    --bg-primary: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --bg-card-hover: rgba(51, 65, 85, 0.8);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: rgba(255, 255, 255, 0.1);
    
    --primary-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --secondary-gradient: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 100%);
    
    --primary-glow: rgba(16, 185, 129, 0.25);
    --secondary-glow: rgba(59, 130, 246, 0.25);
    
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --shadow-main: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
    --bg-primary: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: rgba(0, 0, 0, 0.08);
    --shadow-main: 0 10px 30px -10px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem 1.5rem;
}

.dashboard-container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    width: 52px;
    height: 52px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: #fff;
    box-shadow: 0 0 20px var(--primary-glow);
}

.brand h1 {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.brand .subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.data-badge {
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.theme-toggle-btn:hover {
    transform: scale(1.05);
}

/* Filters */
.filter-section {
    display: flex;
    gap: 1.5rem;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.filter-group select {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.65rem 1.2rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    outline: none;
    cursor: pointer;
}

[data-theme="light"] .filter-group select {
    background: #ffffff;
}

.filter-group select:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.select-group {
    flex-grow: 1;
}

.select-group select {
    width: 100%;
    max-width: 500px;
}

/* Primary KPI Hero Grid */
.kpi-hero-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.hero-card {
    position: relative;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    overflow: hidden;
    box-shadow: var(--shadow-main);
}

.hero-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.25);
}

.primary-theme .kpi-icon-wrapper {
    background: var(--primary-gradient);
    box-shadow: 0 0 25px var(--primary-glow);
}

.secondary-theme .kpi-icon-wrapper {
    background: var(--secondary-gradient);
    box-shadow: 0 0 25px var(--secondary-glow);
}

.kpi-icon-wrapper {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #fff;
    flex-shrink: 0;
}

.kpi-content {
    display: flex;
    flex-direction: column;
}

.kpi-label {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.kpi-value {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.1;
    margin: 0.3rem 0;
    letter-spacing: -0.02em;
    background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

[data-theme="light"] .kpi-value {
    background: linear-gradient(180deg, #0f172a 0%, #334155 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.kpi-subtext {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.kpi-glow {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 250px;
    height: 250px;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
}

.primary-theme .kpi-glow { background: var(--primary-glow); }
.secondary-theme .kpi-glow { background: var(--secondary-glow); }

/* Secondary Cards */
.secondary-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.mini-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-main);
}

.mini-card-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.mini-card-value {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0.5rem 0 0.2rem 0;
    color: var(--text-primary);
}

.mini-card-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Charts */
.charts-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 1.5rem;
}

.chart-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chart-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chart-container {
    position: relative;
    height: 280px;
    width: 100%;
}

/* Footer */
.dashboard-footer {
    text-align: center;
    padding: 1.5rem 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 900px) {
    .kpi-hero-grid, .charts-grid, .secondary-grid {
        grid-template-columns: 1fr;
    }
}