/* ========================================
   CSS Design System - Free Chess Stats DB
   Auto Light/Dark Theme (System Preference)
   ======================================== */

/* ---- CSS Variables (Dark Theme - Default) ---- */
:root {
    /* Colors */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-hover: #30363d;
    --border-color: #30363d;
    --border-subtle: #21262d;

    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;

    --accent: #2563eb;
    --accent-hover: #3b82f6;
    --accent-subtle: rgba(37, 99, 235, 0.1);

    --success: #3fb950;
    --warning: #d29922;
    --danger: #f85149;

    /* Aliases for backwards compatibility */
    --accent-color: var(--accent);
    --success-color: var(--success);
    --warning-color: var(--warning);
    --danger-color: var(--danger);
    --accent-color-rgb: 37, 99, 235;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'SF Mono', 'Consolas', monospace;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 12px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* ---- Light Theme (System Preference) ---- */
@media (prefers-color-scheme: light) {
    :root {
        /* Colors - Light Theme */
        --bg-primary: #ffffff;
        --bg-secondary: #f6f8fa;
        --bg-tertiary: #eaeef2;
        --bg-hover: #d0d7de;
        --border-color: #d0d7de;
        --border-subtle: #eaeef2;

        --text-primary: #1f2328;
        --text-secondary: #656d76;
        --text-muted: #8c959f;

        --accent: #2563eb;
        --accent-hover: #1d4ed8;
        --accent-subtle: rgba(37, 99, 235, 0.1);

        --success: #1a7f37;
        --warning: #9a6700;
        --danger: #cf222e;

        /* Aliases for backwards compatibility */
        --accent-color: var(--accent);
        --success-color: var(--success);
        --warning-color: var(--warning);
        --danger-color: var(--danger);
        --accent-color-rgb: 37, 99, 235;
    }
}

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

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-hover);
}

/* ---- Navigation ---- */
.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

/* Dropdown Menu */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: var(--bg-secondary);
    min-width: 160px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs) 0;
    top: 100%;
    left: 0;
}

.dropdown-content a {
    color: var(--text-secondary);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: all var(--transition-fast);
}

.dropdown-content a:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* Ensure active state works for parent dropdown link */
.nav-link.active {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

/* Update mobile menu for dropdowns */
@media (max-width: 900px) {
    .dropdown {
        display: block;
        width: 100%;
    }

    .dropdown-content {
        position: static;
        display: none;
        width: 100%;
        box-shadow: none;
        background-color: var(--bg-tertiary);
        padding-left: var(--spacing-md);
        border: none;
    }

    .dropdown:hover .dropdown-content,
    .dropdown.active .dropdown-content {
        display: block;
    }

    .dropbtn::after {
        content: ' ▾';
    }
}

/* ---- Main Content ---- */
.main-content {
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    width: 100%;
}

.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

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

/* ---- Controls ---- */
.controls {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.search-box {
    flex: 1;
    min-width: 250px;
    max-width: 400px;
}

.search-input,
.filter-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: border-color var(--transition-fast);
}

.search-input:focus,
.filter-input:focus {
    outline: none;
    border-color: var(--accent);
}

.filter-input {
    width: 80px;
}

.filter-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.filter-controls label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ---- Data Tables ---- */
.table-container {
    overflow-x: auto;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th,
.data-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
}

.data-table th {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: default;
    /* Only sortable headers get pointer */
    user-select: none;
    transition: background-color var(--transition-fast);
    white-space: nowrap;
    text-align: center;
    /* Center-align all headers by default */
}

/* Sortable headers get pointer cursor */
.data-table th[data-sort] {
    cursor: pointer;
}

/* Keep player name column left-aligned */
.data-table th[data-sort="name"],
.data-table th[data-sort="player"],
.data-table th:first-child:not([data-sort]) {
    text-align: left;
}

.data-table th:hover {
    background-color: var(--bg-hover);
}

.data-table th.sorted-asc::after {
    content: ' ▲';
    font-size: 0.7rem;
}

.data-table th.sorted-desc::after {
    content: ' ▼';
    font-size: 0.7rem;
}

.data-table tbody tr {
    transition: background-color var(--transition-fast);
}

.data-table tbody tr:hover {
    background-color: var(--bg-hover);
}

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

.data-table .player-name {
    font-weight: 500;
}

.data-table .numeric {
    font-family: var(--font-mono);
    text-align: center;
}

/* ---- Pagination ---- */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.pagination button {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pagination button:hover:not(:disabled) {
    background-color: var(--bg-hover);
    border-color: var(--accent);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination button.active {
    background-color: var(--accent);
    border-color: var(--accent);
    color: var(--bg-primary);
}

/* ---- Stats Cards ---- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.stat-card .label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.stat-card .value {
    font-size: 2rem;
    font-weight: 700;
    font-family: var(--font-mono);
}

.stat-card .value.highlight {
    color: var(--accent);
}

/* ---- Player Profile ---- */
.profile-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.player-avatar {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--accent-subtle), var(--bg-tertiary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
}

.player-info h1 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
}

.player-meta {
    display: flex;
    gap: var(--spacing-lg);
    color: var(--text-secondary);
}

.player-meta span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* ---- Back Link ---- */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
}

.back-link:hover {
    color: var(--accent);
}

/* ---- Tournament List ---- */
.tournament-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.tournament-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-fast);
}

.tournament-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.tournament-card h3 {
    margin-bottom: var(--spacing-sm);
}

.tournament-card .meta {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ---- Loading State ---- */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
}

.loading::after {
    content: '';
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    margin-left: var(--spacing-md);
    animation: spin 1s linear infinite;
}

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

/* ---- Game Card ---- */
.game-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.game-players {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.game-player {
    text-align: center;
}

.game-player.white {
    text-align: left;
}

.game-player.black {
    text-align: right;
}

.game-result {
    font-weight: 700;
    font-size: 1.25rem;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

/* ---- Footer ---- */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ---- Color-Coded Ratings ---- */
.rating-elite {
    color: #ffd700;
    font-weight: 600;
}

/* 2700+ Gold */
.rating-super {
    color: #c0c0c0;
    font-weight: 600;
}

/* 2600-2699 Silver */
.rating-gm {
    color: #cd7f32;
    font-weight: 600;
}

/* 2500-2599 Bronze */
.rating-im {
    color: #58a6ff;
}

/* 2400-2499 Blue */
.rating-fm {
    color: #3fb950;
}

/* 2300-2399 Green */
.rating-cm {
    color: #8b949e;
}

/* Below 2300 Gray */

/* Light mode rating color overrides for better contrast */
@media (prefers-color-scheme: light) {
    .rating-elite {
        color: #b8860b;
        /* Dark Goldenrod */
    }

    .rating-super {
        color: #708090;
        /* Slate Gray */
    }

    .rating-gm {
        color: #8b4513;
        /* Saddle Brown */
    }

    .rating-im {
        color: #2563eb;
        /* Blue */
    }

    .rating-fm {
        color: #16a34a;
        /* Green */
    }

    .rating-cm {
        color: #6b7280;
        /* Gray */
    }
}

/* ---- Win/Draw/Loss Bars ---- */
.wdl-bar {
    display: flex;
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    background-color: var(--bg-tertiary);
}

.wdl-bar .win {
    background-color: var(--success);
}

.wdl-bar .draw {
    background-color: var(--warning);
}

.wdl-bar .loss {
    background-color: var(--danger);
}

/* ---- Badges ---- */
.badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-elite {
    background-color: rgba(255, 215, 0, 0.2);
    color: #ffd700;
}

.badge-super {
    background-color: rgba(88, 166, 255, 0.2);
    color: var(--accent);
}

.badge-open {
    background-color: rgba(63, 185, 80, 0.2);
    color: var(--success);
}

.badge-women {
    background-color: rgba(210, 153, 34, 0.2);
    color: var(--warning);
}

.badge-league {
    background-color: rgba(139, 148, 158, 0.2);
    color: var(--text-secondary);
}

.badge-rapid {
    background-color: rgba(255, 165, 0, 0.2);
    color: #ffa500;
}

.badge-blitz {
    background-color: rgba(147, 112, 219, 0.2);
    color: #9370db;
}

/* ---- Chart Container ---- */
.chart-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.chart-container img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

.chart-container h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

/* ---- Charts Grid ---- */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
}

/* ---- Global Stats Cards ---- */
.global-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.global-stat {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
}

.global-stat .number {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent);
}

.global-stat .label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ---- Performance Block ---- */
.performance-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.performance-item {
    text-align: center;
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.performance-item .big-number {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
}

.performance-item.wins .big-number {
    color: var(--success);
}

.performance-item.draws .big-number {
    color: var(--warning);
}

.performance-item.losses .big-number {
    color: var(--danger);
}

/* ---- Compare Tool ---- */
.compare-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.compare-vs {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-muted);
    padding-top: var(--spacing-xl);
}

/* ---- Mobile Hamburger Menu ---- */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 30px;
    height: 30px;
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 0;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-xs);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        z-index: 99;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        display: block;
        padding: var(--spacing-md);
        border-radius: var(--radius-md);
    }

    .charts-grid {
        grid-template-columns: 1fr;
    }

    .compare-container {
        grid-template-columns: 1fr;
    }

    .compare-vs {
        text-align: center;
        padding: var(--spacing-md) 0;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--spacing-md);
    }

    .main-content {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        max-width: none;
    }

    .profile-header {
        flex-direction: column;
        text-align: center;
    }

    .player-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .data-table {
        font-size: 0.8rem;
    }

    .data-table th,
    .data-table td {
        padding: var(--spacing-sm);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .performance-grid {
        grid-template-columns: 1fr;
    }

    .global-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ---- Download CSV Button ---- */
.table-actions {
    display: flex;
    justify-content: flex-start;
    margin-top: var(--spacing-md);
    gap: var(--spacing-md);
}

.download-csv-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.download-csv-btn:hover {
    background-color: var(--bg-hover);
    border-color: var(--accent);
    color: var(--text-primary);
}

.download-csv-btn::before {
    content: '⬇';
    font-size: 0.9rem;
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .global-stats {
        grid-template-columns: 1fr;
    }
}

/* ---- Info Icon Tooltips ---- */
.info-tooltip {
    position: relative;
    cursor: help;
    display: inline-block;
    margin-left: 4px;
}

.info-tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    top: 130%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-size: 0.8rem;
    font-weight: 400;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    pointer-events: none;
}

.info-tooltip::before {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-bottom-color: var(--border-color);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    z-index: 1001;
}

.info-tooltip:hover::after,
.info-tooltip:hover::before {
    opacity: 1;
    visibility: visible;
}

/* Prevent sorting when clicking the info icon */
.info-tooltip {
    pointer-events: auto;
}