static/css/board.css

/* Premium Chess Engine Styles */

:root {
    /* Light Mode Variables */
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --secondary: #64748b;
    --secondary-hover: #475569;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    
    --light-square: #f0d9b5;
    --dark-square: #b58863;
    --highlight: rgba(186, 202, 68, 0.7);
    --last-move: rgba(170, 162, 58, 0.5);

    --eval-white: #ffffff;
    --eval-black: #333333;
}

[data-theme="dark"] {
    /* Dark Mode Variables */
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    
    --primary: #3b82f6;
    --primary-hover: #60a5fa;

    --light-square: #b0b2b5;
    --dark-square: #5c6268;
    
    --eval-white: #e2e8f0;
    --eval-black: #1e293b;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    transition: background-color 0.3s, color 0.3s;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: 'Outfit', sans-serif;
    color: var(--text-main);
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
}

.nav-brand {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 1rem;
}

.nav-btn {
    background: none;
    border: none;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
}

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

.nav-controls {
    display: flex;
    gap: 0.5rem;
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    color: var(--text-muted);
    transition: background 0.2s;
}

.icon-btn:hover {
    background: var(--bg-hover);
}

/* App Container */
.app-container {
    flex: 1;
    overflow-y: auto;
    position: relative;
}

/* Views */
.view-section {
    display: none;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    animation: fadeIn 0.3s ease;
}

.view-section.active {
    display: block;
}

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

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    width: 100%;
    margin-top: 1rem;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: var(--secondary); color: white; }
.btn-secondary:hover { background: var(--secondary-hover); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: var(--danger-hover); }

/* Home / New Game View */
.hero-container {
    text-align: center;
    max-width: 600px;
    margin: 4rem auto;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    color: var(--text-muted);
    font-size: 1.2rem;
    margin-bottom: 3rem;
}

.new-game-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.new-game-card h2 {
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-muted);
}

.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-main);
    color: var(--text-main);
    font-size: 1rem;
}

/* Game Layout */
.game-layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 2rem;
    align-items: start;
}

.board-area {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Evaluation Bar */
.eval-bar-container {
    width: 24px;
    background-color: var(--eval-black);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.eval-fill {
    background-color: var(--eval-white);
    width: 100%;
    height: 50%; /* 50% means 0.0 */
    transition: height 0.5s ease;
}

.eval-text {
    position: absolute;
    width: 100%;
    text-align: center;
    font-size: 0.7rem;
    font-weight: bold;
    color: #888;
    top: 50%;
    transform: translateY(-50%);
    mix-blend-mode: difference;
    z-index: 10;
}

/* Chess Board */
.board-wrapper {
    flex-grow: 1;
    max-width: 800px;
    position: relative;
}

.chess-board {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    width: 100%;
    aspect-ratio: 1;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2);
}

.square {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: clamp(2rem, 6vw, 4.5rem);
    cursor: pointer;
    position: relative;
    user-select: none;
    transition: background-color 0.1s;
}

.square.light { background-color: var(--light-square); }
.square.dark { background-color: var(--dark-square); }

.square[data-color="black"] {
    color: #000000;
}
.square[data-color="white"] {
    color: var(--text-main);
}

.square.selected { background-color: var(--highlight) !important; }
.square.last-move { background-color: var(--last-move) !important; }

.square.legal-move::after {
    content: '';
    position: absolute;
    width: 25%;
    height: 25%;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 50%;
}
.square.legal-move.has-piece::after {
    width: 85%;
    height: 85%;
    background-color: transparent;
    border: 6px solid rgba(0, 0, 0, 0.2);
    border-radius: 50%;
    box-sizing: border-box;
}

.board-labels {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
}
.file-label, .rank-label {
    position: absolute;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
}
.file-label { bottom: -20px; }
.rank-label { left: -20px; }

/* Sidebar */
.game-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.sidebar-controls {
    display: flex;
    gap: 0.5rem;
}

.sidebar-controls .btn { flex: 1; }

.game-info-card, .move-history-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.info-row span:first-child { color: var(--text-muted); }

.move-history-card { flex-grow: 1; }
.move-list {
    max-height: 400px;
    overflow-y: auto;
    font-family: 'Inter', monospace;
    font-size: 0.9rem;
    margin-top: 1rem;
}
.move-pair {
    display: flex;
    padding: 0.3rem 0;
}
.move-number { width: 30px; color: var(--text-muted); }
.move { flex: 1; cursor: pointer; padding: 2px 4px; border-radius: 4px; }
.move:hover { background: var(--bg-hover); }

/* Analysis Panel */
.analysis-panel {
    margin-top: 2rem;
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}
.analysis-panel h3 { margin-bottom: 1.5rem; }

.analysis-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}
.summary-card, .profile-card {
    background: var(--bg-main);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
}
.summary-label, .profile-label { display: block; color: var(--text-muted); margin-bottom: 0.5rem; }
.summary-value, .profile-value { font-size: 1.5rem; font-weight: 700; color: var(--primary); }

.analysis-details-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.move-analysis, .critical-moments-list {
    max-height: 300px;
    overflow-y: auto;
    margin-top: 1rem;
}

.move-analysis-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
}
.move-analysis-item:hover { background: var(--bg-hover); }

.critical-moment {
    padding: 1rem;
    background: var(--bg-main);
    border-left: 4px solid var(--danger);
    margin-bottom: 0.5rem;
    border-radius: 0 4px 4px 0;
}

/* Classification Colors */
.classification { padding: 2px 6px; border-radius: 4px; font-size: 0.8rem; font-weight: 600; }
.classification.best { background: var(--success); color: white; }
.classification.great { background: #2ecc71; color: white; }
.classification.good { background: #f1c40f; color: #333; }
.classification.inaccuracy { background: #f39c12; color: white; }
.classification.mistake { background: #e67e22; color: white; }
.classification.blunder { background: var(--danger); color: white; }

/* Profile View */
.profile-layout {
    max-width: 1000px;
    margin: 0 auto;
}

.profile-header {
    text-align: center;
    margin-bottom: 3rem;
}

.elo-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: white;
    font-size: 3rem;
    font-weight: 700;
    padding: 1rem 3rem;
    border-radius: 50px;
    margin-top: 1rem;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.profile-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.profile-details-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.profile-box {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}
.profile-box h4 { margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border-color); }
.strengths-list, .weaknesses-list, .recommendations-list { list-style: none; }
.strengths-list li { color: var(--success); margin-bottom: 0.5rem; }
.weaknesses-list li { color: var(--danger); margin-bottom: 0.5rem; }
.recommendations-list li { color: var(--text-muted); margin-bottom: 0.5rem; }

.hidden { display: none !important; }

/* Modal Styles */
.modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.modal-content {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 400px;
}
.text-center { text-align: center; }
.promo-btn:hover { background: var(--bg-hover) !important; transform: scale(1.05); }

/* Responsive */
@media (max-width: 900px) {
    .game-layout { grid-template-columns: 1fr; }
    .analysis-details-grid { grid-template-columns: 1fr; }
    .profile-summary, .profile-details-grid { grid-template-columns: 1fr; }
    .board-wrapper { max-width: 100%; }
}