/* CSS Variables */
:root {
    --primary-color: #6B46C1;
    --secondary-color: #9333EA;
    --accent-color: #A855F7;
    --dark-color: #1F2937;
    --light-color: #F9FAFB;
    --white: #FFFFFF;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --success: #10B981;
    --error: #EF4444;
    --warning: #F59E0B;
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* Base Styles */
body {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

/* App Layout */
.app {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    min-height: 600px;
    animation: fadeInUp 0.6s ease;
}

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

/* Header */
.header {
    background: linear-gradient(135deg, var(--dark-color) 0%, var(--primary-color) 100%);
    color: var(--white);
    padding: 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.05)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
    pointer-events: none;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    position: relative;
    z-index: 1;
}

.title .icon {
    color: var(--accent-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 500px;
    margin: 0 auto;
    font-weight: 300;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

/* Content Layout */
.content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    padding: 40px;
}

/* Generator Section */
.generator-section {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.palette-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.color-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
}

.color-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.color-display {
    height: 120px;
    width: 100%;
    position: relative;
    transition: var(--transition);
}

.color-display::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, transparent 49%, rgba(255,255,255,0.1) 50%, transparent 51%);
    opacity: 0;
    transition: var(--transition-fast);
}

.color-card:hover .color-display::before {
    opacity: 1;
}

.color-info {
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--gray-50);
}

.color-code {
    font-weight: 600;
    font-size: 1rem;
    color: var(--gray-700);
    font-family: 'Courier New', monospace;
    letter-spacing: 0.5px;
}

.copy-btn {
    background: var(--primary-color);
    color: var(--white);
    padding: 8px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.copy-btn:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}

.copy-btn:active {
    transform: scale(0.95);
}

/* Controls */
.controls {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.generate-btn,
.save-btn {
    flex: 1;
    padding: 16px 24px;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 56px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.generate-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    box-shadow: var(--shadow);
}

.generate-btn:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

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

.save-btn {
    background: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.save-btn:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

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

/* Info Section */
.info-section {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.info-card {
    background: linear-gradient(135deg, var(--gray-100), var(--white));
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
}

.info-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.features-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.features-list li {
    padding: 8px 0;
    color: var(--gray-700);
    font-weight: 400;
    position: relative;
    padding-left: 20px;
}

.features-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

/* Saved Palettes */
.saved-palettes {
    background: var(--white);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 2px solid var(--gray-100);
}

.saved-palettes h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.saved-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.no-saved {
    color: var(--gray-500);
    text-align: center;
    font-style: italic;
    padding: 20px;
}

.saved-palette {
    background: var(--gray-50);
    padding: 15px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--gray-200);
    transition: var(--transition-fast);
}

.saved-palette:hover {
    background: var(--gray-100);
}

.saved-palette-colors {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.saved-color {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid var(--white);
    box-shadow: var(--shadow);
}

.saved-palette-date {
    font-size: 0.85rem;
    color: var(--gray-500);
}

.saved-palette-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.load-btn,
.delete-btn {
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.load-btn {
    background: var(--primary-color);
    color: var(--white);
}

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

.delete-btn {
    background: var(--error);
    color: var(--white);
}

.delete-btn:hover {
    background: #dc2626;
}

/* Toast Notification */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--success);
    color: var(--white);
    padding: 16px 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    transform: translateX(400px);
    transition: var(--transition);
    z-index: 1000;
    font-weight: 500;
}

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

.toast.error {
    background: var(--error);
}

.toast.warning {
    background: var(--warning);
}

/* Loading Animation */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .palette-container {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        gap: 15px;
    }
    
    .header {
        padding: 30px;
    }
    
    .title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .content {
        padding: 20px;
        gap: 20px;
    }
    
    .header {
        padding: 20px;
    }
    
    .title {
        font-size: 1.8rem;
        flex-direction: column;
        gap: 8px;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .palette-container {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: 10px;
    }
    
    .color-display {
        height: 80px;
    }
    
    .color-info {
        padding: 12px;
    }
    
    .color-code {
        font-size: 0.9rem;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .info-card,
    .saved-palettes {
        padding: 20px;
    }
    
    .toast {
        top: 10px;
        right: 10px;
        left: 10px;
        transform: translateY(-100px);
    }
    
    .toast.show {
        transform: translateY(0);
    }
}

@media (max-width: 480px) {
    .palette-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .color-display {
        height: 60px;
    }
    
    .color-info {
        padding: 8px;
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
    
    .color-code {
        font-size: 0.8rem;
    }
    
    .copy-btn {
        width: 100%;
        padding: 6px;
    }
    
    .generate-btn,
    .save-btn {
        padding: 12px 16px;
        font-size: 0.9rem;
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.bounce-in {
    animation: bounceIn 0.6s ease;
}

@keyframes bounceIn {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.05); opacity: 0.8; }
    70% { transform: scale(0.9); opacity: 0.9; }
    100% { transform: scale(1); opacity: 1; }
}

.shake {
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

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

/* High contrast mode */
@media (prefers-contrast: high) {
    .color-card {
        border: 3px solid var(--dark-color);
    }
    
    .copy-btn {
        border: 2px solid var(--white);
    }
}