/**
 * ============================================
 * Pure JS 3D Renderer - Enhanced Stylesheet
 * ============================================
 * Modern, responsive styling with new controls
 * ============================================
 */

/* ============================================
 * CSS Variables
 * ============================================ */
:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-input: #1e293b;
    --accent: #4f46e5;
    --accent-hover: #6366f1;
    --accent-light: rgba(79, 70, 229, 0.15);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --border-light: #475569;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --canvas-bg: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ============================================
 * Header
 * ============================================ */
.header {
    text-align: center;
    padding: 1.5rem 1rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: 0.5px;
}

/* ============================================
 * Main Container
 * ============================================ */
#container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
    flex-wrap: wrap;
}

/* ============================================
 * Canvas Container
 * ============================================ */
.canvas-container {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    padding: 0 0.25rem;
}

.shape-name {
    font-weight: 600;
    color: var(--accent);
    font-size: 0.9rem;
}

.fps-counter {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: 'Courier New', monospace;
    background: var(--bg-input);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

#myCanvas {
    display: block;
    background: var(--canvas-bg);
    border-radius: var(--radius-sm);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.canvas-footer {
    margin-top: 0.75rem;
    text-align: center;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.canvas-footer kbd {
    background: var(--bg-input);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    font-family: inherit;
    font-size: 0.65rem;
    border: 1px solid var(--border);
}

/* ============================================
 * Controls Panel
 * ============================================ */
.controls-panel {
    background: var(--bg-card);
    padding: 1.25rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    width: 320px;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
}

.controls-panel::-webkit-scrollbar {
    width: 6px;
}

.controls-panel::-webkit-scrollbar-track {
    background: var(--bg-input);
    border-radius: 3px;
}

.controls-panel::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 3px;
}

.controls-panel h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

/* ============================================
 * Control Groups (Fieldsets)
 * ============================================ */
.control-group {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    margin-bottom: 0.75rem;
    background: rgba(255, 255, 255, 0.02);
}

.control-group legend {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent);
    padding: 0 0.4rem;
}

/* ============================================
 * Shape Buttons
 * ============================================ */
.shape-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.4rem;
}

.shape-btn {
    padding: 0.4rem 0.5rem;
    background: var(--bg-input);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

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

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

/* ============================================
 * Slider Rows
 * ============================================ */
.slider-row {
    display: grid;
    grid-template-columns: 70px 1fr 45px;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.slider-row:last-child {
    margin-bottom: 0;
}

.slider-row label {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.value-display {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-light);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    text-align: center;
    font-family: 'Courier New', monospace;
}

/* ============================================
 * Checkbox Rows
 * ============================================ */
.checkbox-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
}

.checkbox-row input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    cursor: pointer;
}

.checkbox-row label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
}

/* ============================================
 * Range Slider Styling
 * ============================================ */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 5px;
    background: var(--border);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
}

input[type="range"]:hover {
    background: var(--border-light);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(79, 70, 229, 0.4);
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--accent-hover);
    transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(79, 70, 229, 0.4);
}

/* ============================================
 * Button Group
 * ============================================ */
.button-group {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.btn {
    flex: 1;
    padding: 0.6rem 0.75rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

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

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

.btn:active {
    transform: translateY(0);
}

/* ============================================
 * Info Panel
 * ============================================ */
.info-panel {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem 1.5rem;
}

.info-panel details {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
}

.info-panel summary {
    padding: 1rem 1.25rem;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-secondary);
    transition: var(--transition);
}

.info-panel summary:hover {
    background: var(--border);
}

.info-content {
    padding: 1.25rem;
}

.info-content h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--accent);
}

.info-content ul {
    list-style: none;
}

.info-content li {
    padding: 0.4rem 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.info-content li:last-child {
    border-bottom: none;
}

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

/* ============================================
 * Footer
 * ============================================ */
.footer {
    text-align: center;
    padding: 1.5rem 1rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

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

.footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.footer-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ============================================
 * Responsive Design
 * ============================================ */
@media (max-width: 900px) {
    #container {
        flex-direction: column;
        align-items: center;
    }
    
    .controls-panel {
        width: 100%;
        max-width: 500px;
        max-height: none;
    }
    
    .canvas-container {
        width: 100%;
        max-width: 520px;
    }
    
    #myCanvas {
        width: 100%;
        height: auto;
    }
}

@media (max-width: 600px) {
    .header h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 0.8rem;
    }
    
    #container {
        padding: 1rem;
        gap: 1rem;
    }
    
    .shape-buttons {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .shape-btn {
        padding: 0.35rem 0.25rem;
        font-size: 0.6rem;
    }
    
    .slider-row {
        grid-template-columns: 60px 1fr 40px;
    }
    
    .canvas-footer {
        display: none;
    }
}

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

.canvas-container,
.controls-panel {
    animation: fadeIn 0.4s ease-out;
}

.controls-panel {
    animation-delay: 0.1s;
}

/* Smooth shape button transitions */
.shape-btn {
    position: relative;
    overflow: hidden;
}

.shape-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s;
}

.shape-btn:active::after {
    width: 200%;
    height: 200%;
}