/* ===================================
   CSS Variables
   =================================== */

:root {
    /* Colors - Artist Studio Palette */
    --color-canvas: #faf8f3;
    --color-wood: #8b6f47;
    --color-wood-dark: #5d4e37;
    --color-terracotta: #ff6b35;
    --color-burnt-orange: #f7931e;
    --color-ochre: #d4a574;
    --color-charcoal: #2c1810;
    --color-cream: #fff8e7;
    --color-teal: #4ecdc4;

    /* Typography */
    --font-display: 'Caveat', cursive;
    --font-body: 'Poppins', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Effects */
    --shadow-soft: 0 4px 20px rgba(44, 24, 16, 0.15);
    --shadow-md: 0 8px 30px rgba(44, 24, 16, 0.2);
    --transition: all 0.3s ease;
}

/* ===================================
   Global Styles
   =================================== */

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

body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, #f5ebe0 0%, #e3d5ca 100%);
    color: var(--color-charcoal);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* ===================================
   Canvas Texture Background
   =================================== */

.canvas-texture {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255, 255, 255, 0.1) 2px, rgba(255, 255, 255, 0.1) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(255, 255, 255, 0.1) 2px, rgba(255, 255, 255, 0.1) 4px);
    opacity: 0.3;
    z-index: 0;
    pointer-events: none;
}

/* ===================================
   Container
   =================================== */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* ===================================
   Header
   =================================== */

.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.8s ease-out;
}

.logo {
    display: inline-block;
}

.logo-icon {
    font-size: 5rem;
    animation: swing 3s ease-in-out infinite;
    display: inline-block;
    transform-origin: top center;
}

.logo-text h1 {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 700;
    color: var(--color-terracotta);
    margin: var(--spacing-sm) 0;
    text-shadow: 2px 2px 4px rgba(44, 24, 16, 0.2);
    letter-spacing: 0.1rem;
}

.subtitle {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-wood-dark);
    text-transform: uppercase;
    letter-spacing: 0.3rem;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes swing {
    0%, 100% {
        transform: rotate(0deg);
    }
    25% {
        transform: rotate(5deg);
    }
    75% {
        transform: rotate(-5deg);
    }
}

/* ===================================
   Canvas Section
   =================================== */

.canvas-section {
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.canvas-container {
    background: var(--color-canvas);
    border: 12px solid var(--color-wood);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.canvas-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        repeating-linear-gradient(0deg, transparent, transparent 1px, rgba(139, 111, 71, 0.03) 1px, rgba(139, 111, 71, 0.03) 2px),
        repeating-linear-gradient(90deg, transparent, transparent 1px, rgba(139, 111, 71, 0.03) 1px, rgba(139, 111, 71, 0.03) 2px);
    pointer-events: none;
    z-index: 1;
}

#drawingCanvas {
    display: block;
    background: white;
    cursor: crosshair;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 100%;
    border-radius: 4px;
    position: relative;
    z-index: 2;
}

/* ===================================
   Toolbar
   =================================== */

.toolbar {
    background: linear-gradient(135deg, var(--color-wood) 0%, var(--color-wood-dark) 100%);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.tool-group {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: var(--spacing-md);
    backdrop-filter: blur(10px);
}

.tool-group-title {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-cream);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.1rem;
}

.tool-group-title i {
    color: var(--color-burnt-orange);
}

/* Tool Controls */
.tool-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.control-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.control-item label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-ochre);
    text-transform: uppercase;
    letter-spacing: 0.05rem;
}

.control-item input[type="range"] {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
}

.control-item input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--color-terracotta);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.control-item input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--color-burnt-orange);
    transform: scale(1.1);
}

.control-item input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--color-terracotta);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.control-item input[type="range"]::-moz-range-thumb:hover {
    background: var(--color-burnt-orange);
    transform: scale(1.1);
}

#brushSizeValue {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-cream);
    text-align: center;
}

/* Color Picker */
.color-picker-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

#brushColor {
    width: 100%;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

#brushColor:hover {
    border-color: var(--color-burnt-orange);
    transform: scale(1.02);
}

.color-presets {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xs);
}

.color-preset {
    width: 100%;
    aspect-ratio: 1;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.color-preset:hover {
    transform: scale(1.1);
    border-color: var(--color-cream);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Mode Buttons */
.mode-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.mode-btn {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-cream);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.mode-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--color-burnt-orange);
    transform: translateY(-2px);
}

.mode-btn.active {
    background: var(--color-terracotta);
    border-color: var(--color-terracotta);
    color: white;
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.action-btn {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-cream);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.action-btn:hover {
    background: var(--color-burnt-orange);
    border-color: var(--color-burnt-orange);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(247, 147, 30, 0.4);
}

.action-btn i {
    font-size: 1.1rem;
}

/* ===================================
   Instructions
   =================================== */

.instructions {
    background: var(--color-cream);
    border: 3px solid var(--color-ochre);
    border-radius: 12px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-soft);
    animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

.instructions h3 {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--color-terracotta);
    text-align: center;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.instruction-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.instruction-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.instruction-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.instruction-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.instruction-item p {
    font-size: 0.95rem;
    color: var(--color-wood-dark);
    line-height: 1.5;
}

/* ===================================
   Toast Notification
   =================================== */

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--color-charcoal);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(0);
}

.toast i {
    color: var(--color-teal);
    font-size: 1.3rem;
}

/* ===================================
   Animations
   =================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .logo-text h1 {
        font-size: 3rem;
    }

    .subtitle {
        font-size: 0.8rem;
        letter-spacing: 0.2rem;
    }

    .toolbar {
        grid-template-columns: 1fr;
        padding: var(--spacing-md);
    }

    #drawingCanvas {
        width: 100%;
        height: auto;
    }

    .instruction-list {
        grid-template-columns: 1fr;
    }

    .toast {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
    }
}

@media (max-width: 480px) {
    .logo-text h1 {
        font-size: 2.5rem;
    }

    .color-presets {
        grid-template-columns: repeat(4, 1fr);
    }
}