/* ==========================================
   Asset Market Cap Tracker - Premium Dark Theme
   ========================================== */

:root {
    /* Color Palette */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-card: rgba(22, 27, 34, 0.8);
    
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    
    --accent-blue: #58a6ff;
    --accent-purple: #a371f7;
    --accent-green: #3fb950;
    --accent-red: #f85149;
    --accent-yellow: #d29922;
    --accent-gold: #ffd700;
    --accent-orange: #f7931a;
    
    /* Category Colors */
    --cat-metal: linear-gradient(135deg, #ffd700, #ffb347);
    --cat-crypto: linear-gradient(135deg, #f7931a, #ff6b00);
    --cat-etf: linear-gradient(135deg, #58a6ff, #a371f7);
    --cat-company: linear-gradient(135deg, #3fb950, #2ea043);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(88, 166, 255, 0.3);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

/* App Container */
.app-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* ==========================================
   Header
   ========================================== */
.header {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    font-size: 2.5rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-stats {
    display: flex;
    gap: var(--spacing-xl);
}

.stat-item {
    text-align: right;
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-blue);
}

/* ==========================================
   Controls Bar
   ========================================== */
.controls-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.filter-tabs {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-tab {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-tab:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.filter-tab.active {
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.2), rgba(163, 113, 247, 0.2));
    border-color: var(--accent-blue);
    color: var(--text-primary);
    box-shadow: var(--shadow-glow);
}

.tab-icon {
    font-size: 1rem;
}

/* Search Box */
.search-box {
    position: relative;
    min-width: 250px;
}

.search-box input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-left: 40px;
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.875rem;
    opacity: 0.5;
}

/* ==========================================
   Loading State
   ========================================== */
.loading-overlay {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) * 2;
    gap: var(--spacing-md);
}

.loading-overlay.hidden {
    display: none;
}

.loader {
    width: 48px;
    height: 48px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ==========================================
   Table
   ========================================== */
.table-container {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.assets-table {
    width: 100%;
    border-collapse: collapse;
}

.assets-table th {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    white-space: nowrap;
}

.assets-table th.sortable {
    cursor: pointer;
    transition: color 0.2s ease;
}

.assets-table th.sortable:hover {
    color: var(--accent-blue);
}

.assets-table th.sortable.active {
    color: var(--accent-blue);
}

.assets-table th.sortable::after {
    content: '↕';
    margin-left: 6px;
    opacity: 0.3;
}

.assets-table th.sortable.asc::after {
    content: '↑';
    opacity: 1;
}

.assets-table th.sortable.desc::after {
    content: '↓';
    opacity: 1;
}

.th-right {
    text-align: right !important;
}

.th-category {
    text-align: center !important;
}

.assets-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    vertical-align: middle;
}

.assets-table tbody tr {
    transition: background 0.15s ease;
}

.assets-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* Rank */
.rank-cell {
    font-weight: 600;
    color: var(--text-muted);
    width: 50px;
}

/* Asset Name Cell */
.asset-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.asset-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

/* Asset Logo Image */
.asset-logo {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: contain;
    background: var(--bg-tertiary);
    flex-shrink: 0;
}

.asset-icon-fallback {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.asset-icon.metal {
    background: var(--cat-metal);
}

.asset-icon.crypto {
    background: var(--cat-crypto);
}

.asset-icon.etf {
    background: var(--cat-etf);
}

.asset-icon.company {
    background: var(--cat-company);
}

.asset-info {
    display: flex;
    flex-direction: column;
}

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

.asset-symbol {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Category Badge */
.category-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.category-badge.metal {
    background: rgba(255, 215, 0, 0.15);
    color: var(--accent-gold);
}

.category-badge.crypto {
    background: rgba(247, 147, 26, 0.15);
    color: var(--accent-orange);
}

.category-badge.etf {
    background: rgba(88, 166, 255, 0.15);
    color: var(--accent-blue);
}

.category-badge.company {
    background: rgba(63, 185, 80, 0.15);
    color: var(--accent-green);
}

/* Price & Values */
.price-cell {
    font-weight: 600;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.change-cell {
    text-align: right;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.change-cell.positive {
    color: var(--accent-green);
}

.change-cell.negative {
    color: var(--accent-red);
}

.marketcap-cell {
    text-align: right;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.metric-cell {
    text-align: right;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

/* ==========================================
   Footer
   ========================================== */
.footer-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.75rem;
}

.refresh-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.refresh-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--accent-blue);
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1024px) {
    .header-stats {
        gap: var(--spacing-lg);
    }
    
    .stat-value {
        font-size: 1.25rem;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-sm);
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .header-stats {
        justify-content: center;
    }
    
    .controls-bar {
        flex-direction: column;
    }
    
    .filter-tabs {
        width: 100%;
        justify-content: center;
    }
    
    .search-box {
        width: 100%;
    }
    
    .assets-table th,
    .assets-table td {
        padding: var(--spacing-sm);
    }
    
    /* Hide less important columns on mobile */
    .assets-table th:nth-child(7),
    .assets-table td:nth-child(7),
    .assets-table th:nth-child(8),
    .assets-table td:nth-child(8) {
        display: none;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .filter-tab span:not(.tab-icon) {
        display: none;
    }
    
    .filter-tab {
        padding: var(--spacing-sm);
    }
    
    /* Hide category column on small mobile */
    .assets-table th:nth-child(3),
    .assets-table td:nth-child(3) {
        display: none;
    }
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.assets-table tbody tr {
    animation: fadeIn 0.3s ease forwards;
}

.assets-table tbody tr:nth-child(1) { animation-delay: 0.02s; }
.assets-table tbody tr:nth-child(2) { animation-delay: 0.04s; }
.assets-table tbody tr:nth-child(3) { animation-delay: 0.06s; }
.assets-table tbody tr:nth-child(4) { animation-delay: 0.08s; }
.assets-table tbody tr:nth-child(5) { animation-delay: 0.1s; }
.assets-table tbody tr:nth-child(6) { animation-delay: 0.12s; }
.assets-table tbody tr:nth-child(7) { animation-delay: 0.14s; }
.assets-table tbody tr:nth-child(8) { animation-delay: 0.16s; }
.assets-table tbody tr:nth-child(9) { animation-delay: 0.18s; }
.assets-table tbody tr:nth-child(10) { animation-delay: 0.2s; }