/* ============================================
   LANGTON'S ANT & TURING MACHINE SIMULATOR
   Dark Theme Styles
   ============================================ */

:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --text-primary: #eaeaea;
    --text-secondary: #a0a0a0;
    --accent: #e94560;
    --accent-hover: #ff6b6b;
    --border: #2a2a4a;
    --success: #4ade80;
    --warning: #fbbf24;
    --danger: #ef4444;
    --tape-cell: #2a2a4a;
    --tape-head: #e94560;
}

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

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

h1 {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 10px;
}

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

/* Controls Section */
.controls-section {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid var(--border);
}

.control-group {
    margin-bottom: 20px;
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.control-label small {
    display: block;
    font-weight: 400;
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: 4px;
}

/* Buttons */
button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
    transition: all 0.2s ease;
}

.mode-btn,
.control-btn,
.preset-btn {
    padding: 10px 16px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.mode-btn:hover,
.control-btn:hover,
.preset-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
}

.mode-btn.active {
    background: var(--accent);
    border-color: var(--accent);
}

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

.control-btn.primary:hover {
    background: var(--accent-hover);
}

.control-btn.warning {
    background: var(--warning);
    color: var(--bg-primary);
    border-color: var(--warning);
}

.control-btn.warning:hover {
    background: #f59e0b;
}

.button-group {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* Input Fields */
.text-input,
.textarea-input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: 'Consolas', 'Monaco', monospace;
}

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

.textarea-input {
    resize: vertical;
    min-height: 80px;
}

/* Slider */
.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
}

.slider::-webkit-slider-thumb:hover {
    background: var(--accent-hover);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
}

.slider::-moz-range-thumb:hover {
    background: var(--accent-hover);
}

/* Mode Controls */
.mode-controls {
    display: none;
}

.mode-controls.active {
    display: block;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 20px;
    margin-bottom: 20px;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* Canvas Container */
.canvas-container {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border);
    overflow: hidden;
}

#simulation-canvas {
    display: block;
    width: 100%;
    height: 600px;
    cursor: grab;
}

#simulation-canvas:active {
    cursor: grabbing;
}

.canvas-overlay {
    position: absolute;
    top: 10px;
    left: 10px;
    background: rgba(0, 0, 0, 0.7);
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 0.85rem;
}

.overlay-info {
    color: var(--text-primary);
}

/* Stats Panel */
.stats-panel {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
    height: fit-content;
}

.stats-panel h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--accent);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.stat-value {
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Consolas', 'Monaco', monospace;
}

.turing-specific {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 2px solid var(--border);
}

/* Info Panel */
.info-panel {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 2px solid var(--border);
}

.info-panel h4 {
    font-size: 1rem;
    margin-bottom: 10px;
    color: var(--accent);
}

.info-panel p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.info-panel ul {
    margin-left: 20px;
    margin-bottom: 10px;
}

.info-panel li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.info-panel strong {
    color: var(--accent);
}

/* Tape Display */
.tape-display {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 20px;
}

.tape-display h4 {
    font-size: 1rem;
    margin-bottom: 15px;
    color: var(--accent);
}

.tape-content {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    align-items: center;
    padding: 15px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    overflow-x: auto;
}

.tape-cell {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--tape-cell);
    border: 2px solid var(--border);
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 1rem;
    font-weight: 600;
    flex-shrink: 0;
}

.tape-head {
    background: var(--tape-head);
    border-color: var(--tape-head);
    color: white;
    transform: scale(1.1);
}

.tape-indicator {
    color: var(--text-secondary);
    font-size: 1.2rem;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .controls-section {
        padding: 15px;
    }

    .main-content {
        grid-template-columns: 1fr;
    }

    #simulation-canvas {
        height: 400px;
    }

    .stats-panel {
        padding: 15px;
    }

    .button-group {
        flex-direction: column;
    }

    .button-group button {
        width: 100%;
    }

    .tape-content {
        padding: 10px;
    }

    .tape-cell {
        width: 30px;
        height: 30px;
        font-size: 0.9rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles */
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
    }

    .controls-section,
    .canvas-overlay {
        display: none;
    }

    .canvas-container,
    .stats-panel,
    .tape-display {
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

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

.mt-1 {
    margin-top: 0.5rem;
}

.mt-2 {
    margin-top: 1rem;
}

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}