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

:root {
    --parchment: #f5f0e6;
    --parchment-dark: #e8e0d0;
    --ink: #1a1a1a;
    --ink-light: #4a4a4a;
    --accent: #8b4513;
    --shadow: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Crimson Pro', Georgia, serif;
    background: var(--parchment);
    color: var(--ink);
    min-height: 100vh;
    background-image: 
        radial-gradient(ellipse at 20% 20%, rgba(139, 69, 19, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(139, 69, 19, 0.03) 0%, transparent 50%);
}

.page-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--ink-light);
    margin-bottom: 1.5rem;
}

.section-number {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 2rem;
    font-weight: 400;
    font-style: italic;
}

.ornament {
    font-size: 1.5rem;
    opacity: 0.7;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
    flex: 1;
}

.canvas-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}

#canvas {
    background: var(--parchment);
    border: 1px solid var(--ink-light);
    box-shadow: 
        0 4px 20px var(--shadow),
        inset 0 0 100px rgba(139, 69, 19, 0.05);
    max-width: 100%;
    height: auto;
}

.figure-label {
    font-family: 'Crimson Pro', Georgia, serif;
    font-style: italic;
    font-size: 0.9rem;
    margin-top: 1rem;
    color: var(--ink-light);
}

.controls-panel {
    background: var(--parchment-dark);
    padding: 1.5rem;
    border: 1px solid var(--ink-light);
    box-shadow: 0 2px 10px var(--shadow);
    height: fit-content;
    max-height: calc(100vh - 150px);
    overflow-y: auto;
}

.panel-section {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px dashed rgba(26, 26, 26, 0.2);
}

.panel-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.section-title {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
    color: var(--ink);
}

.control-group {
    margin-bottom: 0.75rem;
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
    color: var(--ink-light);
}

.control-group .value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    background: var(--parchment);
    padding: 0.1rem 0.4rem;
    border-radius: 2px;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--ink-light);
    border-radius: 3px;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--ink);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--ink);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.toggle-group {
    display: flex;
    gap: 0.5rem;
}

.toggle-btn {
    flex: 1;
    padding: 0.5rem 0.5rem;
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 0.85rem;
    background: var(--parchment);
    border: 1px solid var(--ink-light);
    cursor: pointer;
    transition: all 0.15s ease;
    min-height: 44px;
}

.toggle-btn:hover {
    background: var(--ink-light);
    color: var(--parchment);
}

.toggle-btn.active {
    background: var(--ink);
    color: var(--parchment);
    border-color: var(--ink);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    min-height: 44px;
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--ink);
    cursor: pointer;
}

.preset-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.preset-btn {
    padding: 0.6rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    background: var(--parchment);
    border: 1px solid var(--ink-light);
    cursor: pointer;
    transition: all 0.15s ease;
    min-height: 44px;
}

.preset-btn:hover {
    background: var(--ink-light);
    color: var(--parchment);
}

.preset-btn.active {
    background: var(--ink);
    color: var(--parchment);
    border-color: var(--ink);
}

.actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.action-btn {
    padding: 0.75rem 0.75rem;
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 0.9rem;
    background: var(--ink);
    color: var(--parchment);
    border: 1px solid var(--ink);
    cursor: pointer;
    transition: all 0.15s ease;
    min-height: 48px;
}

.action-btn:hover {
    background: var(--parchment);
    color: var(--ink);
}

.action-btn:first-child {
    grid-column: span 2;
}

.page-footer {
    text-align: center;
    padding: 1.5rem;
    font-size: 0.85rem;
    color: var(--ink-light);
    border-top: 1px solid var(--ink-light);
    margin-top: 2rem;
}

.page-footer a {
    color: var(--accent);
    text-decoration: none;
}

.page-footer a:hover {
    text-decoration: underline;
}

.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--ink);
    color: var(--parchment);
    padding: 0.75rem 1.5rem;
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 0.9rem;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    z-index: 1000;
    border-radius: 4px;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Scrollbar styling */
.controls-panel::-webkit-scrollbar {
    width: 6px;
}

.controls-panel::-webkit-scrollbar-track {
    background: var(--parchment);
}

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

/* Mobile responsive */
@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .controls-panel {
        max-height: none;
        order: 2;
    }
    
    .canvas-section {
        order: 1;
    }
    
    #canvas {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .page-container {
        padding: 0.5rem;
    }
    
    .controls-panel {
        padding: 1rem;
    }
    
    .preset-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .section-number {
        font-size: 1.5rem;
    }
    
    .toggle-btn,
    .preset-btn,
    .action-btn {
        min-height: 48px;
        font-size: 0.9rem;
    }
    
    input[type="range"] {
        height: 8px;
    }
    
    input[type="range"]::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }
    
    input[type="range"]::-moz-range-thumb {
        width: 24px;
        height: 24px;
    }
}