/* CSS Variables */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b0;
    --accent-primary: #6c5ce7;
    --accent-secondary: #a29bfe;
    --accent-success: #00b894;
    --accent-warning: #fdcb6e;
    --wall-color: #2d2d44;
    --path-color: #1a1a25;
    --current-cell: #fd79a8;
    --visited-cell: #74b9ff;
    --frontier-cell: #ffeaa7;
    --border-radius: 12px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    text-align: center;
    padding: 30px 0;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo {
    width: 60px;
    height: 60px;
    border-radius: var(--border-radius);
}

.header h1 {
    font-size: 2.2rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-top: 8px;
}

/* Sections */
section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: var(--shadow);
}

section h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--accent-secondary);
}

/* Controls */
.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: flex-end;
    margin-bottom: 25px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-group label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

select, input[type="range"] {
    background: var(--bg-tertiary);
    border: 1px solid var(--wall-color);
    color: var(--text-primary);
    padding: 10px 15px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: border-color 0.2s;
}

select:hover, select:focus {
    border-color: var(--accent-primary);
    outline: none;
}

input[type="range"] {
    width: 150px;
    padding: 5px;
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    border-radius: 4px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    transition: transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

#speed-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #5a4bd1);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.4);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--wall-color);
}

.btn-secondary:hover {
    background: var(--wall-color);
}

/* Canvas Container */
.canvas-container {
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

canvas {
    display: block;
    max-width: 100%;
}

.generation-status {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(0, 0, 0, 0.7);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
}

.status-text {
    color: var(--accent-secondary);
}

/* Algorithm Info */
.algorithm-info {
    margin-top: 20px;
    padding: 15px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border-left: 3px solid var(--accent-primary);
}

.algorithm-info h3 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--accent-secondary);
}

.algorithm-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Player Section */
.player-section {
    display: none;
}

.player-section.visible {
    display: block;
    animation: fadeIn 0.5s ease;
}

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

/* Character Selection */
.character-selection {
    margin-bottom: 20px;
}

.character-selection h3 {
    font-size: 1rem;
    margin-bottom: 15px;
    color: var(--text-secondary);
}

.characters {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

.character-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 15px;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s;
    min-width: 100px;
}

.character-option:hover {
    background: var(--wall-color);
    transform: translateY(-3px);
}

.character-option.selected {
    border-color: var(--accent-primary);
    background: rgba(108, 92, 231, 0.2);
}

.character-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    overflow: hidden;
}

.character-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.character-name {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Game Info */
.game-info {
    display: flex;
    align-items: center;
    gap: 25px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    align-items: center;
    gap: 8px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.stat-value {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-secondary);
    min-width: 60px;
}

/* Win Overlay */
.win-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.win-overlay.visible {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.win-content {
    text-align: center;
    padding: 40px;
}

.win-content h2 {
    font-size: 2rem;
    color: var(--accent-success);
    margin-bottom: 10px;
}

.win-content p {
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.win-stats {
    font-size: 1.1rem;
    color: var(--accent-secondary);
    margin-bottom: 25px;
}

/* Mobile Controls */
.mobile-controls {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    margin-top: 20px;
}

.control-row {
    display: flex;
    gap: 5px;
}

.arrow-btn {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--wall-color);
    color: var(--text-primary);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.1s;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.arrow-btn:active {
    background: var(--accent-primary);
    transform: scale(0.95);
}

.controls-hint {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 15px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.6rem;
    }

    .logo-container {
        flex-direction: column;
        gap: 10px;
    }

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

    .control-group {
        width: 100%;
    }

    select, .btn {
        width: 100%;
    }

    input[type="range"] {
        width: 100%;
    }

    .mobile-controls {
        display: flex;
    }

    .character-option {
        min-width: 80px;
        padding: 10px;
    }

    .character-avatar {
        width: 40px;
        height: 40px;
        font-size: 1.4rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    section {
        padding: 15px;
    }

    .canvas-container {
        min-height: 300px;
    }

    .arrow-btn {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
}

/* Touch device detection - show mobile controls */
@media (hover: none) and (pointer: coarse) {
    .mobile-controls {
        display: flex;
    }
}