/* ============================================
   VARIABLES & RESET
   ============================================ */
:root {
    /* Colors - Premium Dark Theme */
    --color-bg: hsl(220, 15%, 10%);
    --color-surface: hsl(220, 15%, 15%);
    --color-surface-hover: hsl(220, 15%, 18%);
    --color-border: hsl(220, 15%, 25%);
    
    --color-primary: hsl(220, 90%, 56%);
    --color-primary-light: hsl(220, 90%, 65%);
    --color-primary-dark: hsl(220, 90%, 45%);
    
    --color-success: hsl(142, 71%, 45%);
    --color-warning: hsl(45, 93%, 47%);
    --color-danger: hsl(0, 84%, 60%);
    --color-info: hsl(199, 89%, 48%);
    
    --color-text: hsl(0, 0%, 95%);
    --color-text-secondary: hsl(0, 0%, 70%);
    --color-text-muted: hsl(0, 0%, 50%);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, hsl(220, 90%, 56%) 0%, hsl(260, 90%, 60%) 100%);
    --gradient-success: linear-gradient(135deg, hsl(142, 71%, 45%) 0%, hsl(162, 71%, 50%) 100%);
    --gradient-surface: linear-gradient(135deg, hsl(220, 15%, 15%) 0%, hsl(220, 15%, 18%) 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.4);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ============================================
   CONTAINER & LAYOUT
   ============================================ */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* ============================================
   HEADER
   ============================================ */
.header {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--gradient-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.header-title {
    font-family: 'Inter', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-direction: column;
    align-items: flex-start;
}

.header-title .icon {
    font-size: 3rem;
}

.subtitle {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    -webkit-text-fill-color: var(--color-text-secondary);
}

.sync-btn {
    padding: 1rem 2rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.sync-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.sync-btn:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.2rem;
    animation: rotate 2s linear infinite paused;
}

.sync-btn.syncing .btn-icon {
    animation-play-state: running;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ============================================
   LOADING OVERLAY
   ============================================ */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: none;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 9999;
    gap: var(--spacing-md);
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--color-surface);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    color: var(--color-text);
    font-size: 1.2rem;
    font-weight: 500;
}

/* ============================================
   STATS GRID
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--gradient-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.stat-icon {
    font-size: 3rem;
    opacity: 0.9;
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.stat-value {
    font-family: 'Inter', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary-light);
    line-height: 1;
}

.stat-value.small {
    font-size: 1.5rem;
}

/* ============================================
   CHARTS GRID
   ============================================ */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.chart-card {
    grid-column: span 6;
    background: var(--gradient-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.chart-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.chart-card.large {
    grid-column: span 8;
}

.chart-card.full-width {
    grid-column: span 12;
}

.card-header {
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-family: 'Inter', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

.chart-container {
    position: relative;
    height: 300px;
}

.chart-card.large .chart-container {
    height: 350px;
}

/* ============================================
   KEYWORDS CLOUD
   ============================================ */
.keywords-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    min-height: 300px;
    align-items: center;
    justify-content: center;
}

.keyword-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--color-surface-hover);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: default;
}

.keyword-tag:hover {
    background: var(--color-primary);
    border-color: var(--color-primary-light);
    transform: scale(1.05);
}

.loading-keywords {
    color: var(--color-text-muted);
    font-style: italic;
}

/* ============================================
   CATEGORY BREAKDOWN TABLE
   ============================================ */
.table-section {
    margin-bottom: var(--spacing-xl);
}

.category-breakdown {
    display: grid;
    gap: var(--spacing-sm);
}

.category-row {
    display: grid;
    grid-template-columns: 2fr 1fr 3fr;
    gap: var(--spacing-md);
    align-items: center;
    padding: var(--spacing-md);
    background: var(--color-surface-hover);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.category-row:hover {
    background: var(--color-border);
    transform: translateX(4px);
}

.category-name {
    font-weight: 600;
    color: var(--color-text);
}

.category-count {
    color: var(--color-primary-light);
    font-weight: 700;
    font-family: 'Inter', sans-serif;
}

.category-bar-wrapper {
    position: relative;
    height: 24px;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.category-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    transition: width var(--transition-slow);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 0.5rem;
}

.category-percentage {
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .chart-card.large {
        grid-column: span 12;
    }
    
    .chart-card {
        grid-column: span 12;
    }
}

@media (max-width: 768px) {
    .header-title {
        font-size: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .category-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .container {
        padding: var(--spacing-sm);
    }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-card,
.chart-card {
    animation: fadeIn var(--transition-slow) ease-out;
}

/* Stagger animation */
.stat-card:nth-child(1) { animation-delay: 0ms; }
.stat-card:nth-child(2) { animation-delay: 100ms; }
.stat-card:nth-child(3) { animation-delay: 200ms; }
.stat-card:nth-child(4) { animation-delay: 300ms; }