* {
    box-sizing: border-box;
}

:root {
    /* New Theme Colors */
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #4caf50;
    --accent-hover: #45a049;
    --card-bg: #252525;
    --card-border: #333;
    --glass-blur: blur(12px);

    /* Legacy Variable Mappings (Restoring compatibility) */
    --bg-color: var(--bg-primary);
    --accent-color: var(--accent);
    --accent-hover: var(--accent-hover);
    --danger-color: #ef4444;
    --success-color: #22c55e;
}

.color-indicator {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 6px;
    border: 1px solid #666;
}

.color-indicator.white {
    background-color: #fff;
}

.color-indicator.black {
    background-color: #000;
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    background-image: radial-gradient(circle at top right, #1e293b 0%, transparent 40%),
        radial-gradient(circle at bottom left, #0f172a 0%, transparent 40%);
    min-height: 100vh;
    overflow-x: hidden;
    /* Prevent horizontal scroll on mobile */
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

@media (max-width: 600px) {
    .app-container {
        padding: 1rem;
    }
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--card-border);
}

h1 {
    margin: 0;
    font-weight: 800;
    background: linear-gradient(to right, #60a5fa, #a855f7);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

input[type="text"] {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-family: inherit;
}

/* Buttons */
button {
    cursor: pointer;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.2s;
}

.primary-btn {
    background: var(--accent-color);
    color: white;
}

.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.secondary-btn {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
}

.secondary-btn:hover {
    background: rgba(59, 130, 246, 0.1);
}

.danger-btn {
    background: transparent;
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}

.danger-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #dc2626;
}

.text-btn {
    background: transparent;
    color: var(--text-secondary);
    padding: 0;
}

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

#back-to-arenas {
    font-size: 1.1rem;
    padding: 0.75rem 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: inline-block;
    transition: all 0.2s;
}

#back-to-arenas:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--accent-color);
    transform: translateX(-2px);
}

/* Layout */
.cols {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 2rem;
}

@media (max-width: 900px) {
    .cols {
        grid-template-columns: 1fr;
    }
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 1.5rem;
    transition: transform 0.2s;
    cursor: pointer;
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-color);
}

/* Unicode Pieces */
.piece-unicode {
    font-size: 40px;
    text-align: center;
    line-height: 45px;
    /* Adjust based on square size */
    cursor: pointer;
    width: 100%;
    height: 100%;
    user-select: none;
}

.white-piece {
    color: #fff;
    text-shadow: 0 0 2px #000;
    /* Outline for visibility */
}

.black-piece {
    color: #000;
    text-shadow: 0 0 2px #fff;
    /* Outline for visibility */
}

.card h3 {
    margin-top: 0;
}

/* Board */
#board,
#board-editor {
    width: 400px;
    max-width: 100%;
    /* Prevent overflow on small screens */
    /* height: 400px; Removed to allow dynamic height with spare pieces */
    /* Force height */
    border: 4px solid var(--card-border);
    border-radius: 4px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    margin: 0 auto;
    /* Center it */
    touch-action: pan-y;
    /* Allow vertical scroll on board background, prevent horizontal */
    user-select: none;
    /* Prevent selection */
    -webkit-tap-highlight-color: transparent;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

/* Autocapture phase visual indicator */
#board.autocapture-phase,
#board-editor.autocapture-phase {
    border-color: #ef4444;
    box-shadow: 0 0 30px rgba(239, 68, 68, 0.6), 0 10px 30px rgba(0, 0, 0, 0.5);
    animation: autocapture-pulse 1s ease-in-out infinite;
}

@keyframes autocapture-pulse {

    0%,
    100% {
        border-color: #ef4444;
        box-shadow: 0 0 30px rgba(239, 68, 68, 0.6), 0 10px 30px rgba(0, 0, 0, 0.5);
    }

    50% {
        border-color: #dc2626;
        box-shadow: 0 0 40px rgba(239, 68, 68, 0.8), 0 10px 30px rgba(0, 0, 0, 0.5);
    }
}

#board img,
#board-editor img {
    touch-action: none;
    /* Critical: Prevent scroll when dragging pieces */
}

.controls {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.status-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.move-list {
    margin-top: 1rem;
    max-height: 150px;
    overflow-y: auto;
    font-family: monospace;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.5rem;
    border-radius: 0.5rem;
}

/* Sidebar */
.col-sidebar {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 1rem;
    height: fit-content;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 0.5rem;
}

.tab-btn {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.5rem;
}

.tab-btn.active {
    color: var(--accent-color);
    border-bottom: 2px solid var(--accent-color);
    border-radius: 0;
}

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

th,
td {
    text-align: left;
    padding: 0.75rem 0.5rem;
    border-bottom: 1px solid var(--card-border);
}

th {
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.hidden {
    display: none !important;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--card-border);
    border-radius: 4px;
}

/* Leaderboards Grid */
.leaderboards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.leaderboard-card {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 1.5rem;
    transition: all 0.2s;
}

.leaderboard-card.clickable {
    cursor: pointer;
}

.leaderboard-card.clickable:hover {
    transform: translateY(-4px);
    border-color: var(--accent-color);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.2);
}

.leaderboard-card h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.mini-leaderboard {
    width: 100%;
    font-size: 0.9rem;
}

.mini-leaderboard th {
    font-size: 0.75rem;
    padding: 0.5rem 0.25rem;
}

.mini-leaderboard td {
    padding: 0.6rem 0.25rem;
}

/* Color-coded Rankings */
.rank-1 {
    background: linear-gradient(90deg, rgba(255, 215, 0, 0.2) 0%, rgba(255, 215, 0, 0.05) 100%);
    border-left: 3px solid #FFD700;
    font-weight: 600;
}

.rank-2 {
    background: linear-gradient(90deg, rgba(192, 192, 192, 0.2) 0%, rgba(192, 192, 192, 0.05) 100%);
    border-left: 3px solid #C0C0C0;
    font-weight: 600;
}

.rank-3 {
    background: linear-gradient(90deg, rgba(205, 127, 50, 0.2) 0%, rgba(205, 127, 50, 0.05) 100%);
    border-left: 3px solid #CD7F32;
    font-weight: 600;
}

.rank-top10 {
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.15) 0%, rgba(59, 130, 246, 0.03) 100%);
    border-left: 3px solid rgba(59, 130, 246, 0.4);
}

/* User Position Highlight */
.user-row {
    position: relative;
    box-shadow: 0 0 15px rgba(168, 85, 247, 0.4);
    border: 2px solid rgba(168, 85, 247, 0.6) !important;
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {

    0%,
    100% {
        box-shadow: 0 0 15px rgba(168, 85, 247, 0.4);
    }

    50% {
        box-shadow: 0 0 25px rgba(168, 85, 247, 0.6);
    }
}

/* Section Spacing */
#leaderboards-section {
    margin-bottom: 3rem;
}

#leaderboards-section h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

/* Modal Styles */
.modal {
    display: flex;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal.hidden {
    display: none;
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 2rem;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    /* Limit height */
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    position: relative;
    animation: modalSlideIn 0.3s ease-out;
}

.modal-body {
    overflow-y: auto;
    /* Enable scrolling */
    padding-right: 0.5rem;
    /* Space for scrollbar */
    margin-top: 1rem;
}

/* Custom Scrollbar for Modal */
.modal-body::-webkit-scrollbar {
    width: 8px;
}

.modal-body::-webkit-scrollbar-track {
    background: transparent;
}

.modal-body::-webkit-scrollbar-thumb {
    background: var(--card-border);
    border-radius: 4px;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close-modal {
    color: var(--text-secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}

.close-modal:hover,
.close-modal:focus {
    color: var(--text-primary);
    text-decoration: none;
}

.modal-body h3 {
    margin-top: 1.5rem;
    color: var(--accent-color);
    font-size: 1.1rem;
}

.modal-body p {
    color: var(--text-primary);
    line-height: 1.6;
}

.alert-box {
    background: rgba(59, 130, 246, 0.1);
    border-left: 4px solid var(--accent-color);
    padding: 1rem;
    margin-top: 1.5rem;
    border-radius: 0.25rem;
    color: var(--text-primary);
}

/* Edit Mode */
#edit-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Spare Pieces (Chessboard.js) */
.spare-pieces-7492f {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.edit-mode .spare-pieces-7492f {
    opacity: 1;
    pointer-events: auto;
}

/* When in edit mode, maybe highlight the board? */
.edit-mode #board {
    border-color: var(--accent-color);
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.3);
}