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

:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --background: #f8f9fa;
    --surface: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --border: #e1e8ed;
    --shadow: rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: var(--surface);
    padding: 2rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border);
    position: relative;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.lang-selector {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 0.5rem;
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-primary);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.lang-btn:hover {
    background: var(--background);
    transform: translateY(-2px);
}

.lang-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Main Content */
main {
    padding: 3rem 0;
}

section {
    background: var(--surface);
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px var(--shadow);
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

/* Color Input Section */
.color-input-section {
    display: flex;
    justify-content: center;
}

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

.input-group label {
    display: block;
    margin-bottom: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--background);
    padding: 1rem;
    border-radius: 0.75rem;
    border: 2px solid var(--border);
}

#baseColor {
    width: 80px;
    height: 80px;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    background: none;
}

#colorHex {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-size: 1rem;
    width: 150px;
    text-transform: uppercase;
    font-family: 'Courier New', monospace;
}

/* Palette Type Section */
.palette-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.palette-btn {
    padding: 1rem;
    border: 2px solid var(--border);
    background: var(--surface);
    color: var(--text-primary);
    border-radius: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    font-weight: 500;
}

.palette-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px var(--shadow);
}

.palette-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: transparent;
}

/* Palette Display */
.palette-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.color-card {
    background: var(--surface);
    border-radius: 0.75rem;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.color-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow);
}

.color-sample {
    height: 120px;
    width: 100%;
    position: relative;
}

.color-info {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.color-hex {
    font-weight: 600;
    font-size: 1.1rem;
    font-family: 'Courier New', monospace;
}

.color-rgb {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-family: 'Courier New', monospace;
}

/* Export Section */
.export-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.export-btn {
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--primary-color);
    background: var(--surface);
    color: var(--primary-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

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

.export-result {
    position: relative;
}

#exportTextarea {
    width: 100%;
    height: 200px;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-family: 'Courier New', monospace;
    resize: vertical;
    background: var(--background);
}

.copy-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.copy-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

/* Preview Section */
.preview-container {
    display: flex;
    justify-content: center;
}

.preview-card {
    width: 100%;
    max-width: 400px;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 4px 15px var(--shadow);
    transition: var(--transition);
}

.preview-header {
    padding: 1.5rem;
    background: var(--primary-color);
    color: white;
}

.preview-header h3 {
    margin: 0;
    font-size: 1.25rem;
}

.preview-body {
    padding: 2rem;
    background: var(--surface);
}

.preview-body p {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.preview-button {
    padding: 0.75rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
}

.preview-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    margin-top: 3rem;
}

/* Copy Notification */
.copy-notification {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: white;
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 4px 15px var(--shadow);
    animation: slideUp 0.3s ease;
    z-index: 1000;
}

@keyframes slideUp {
    from {
        transform: translateX(-50%) translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .lang-selector {
        position: static;
        justify-content: center;
        margin-top: 1rem;
    }
    
    .palette-buttons {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
    
    .palette-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .export-buttons {
        flex-direction: column;
    }
    
    .export-btn {
        width: 100%;
    }
    
    section {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    .palette-grid {
        grid-template-columns: 1fr;
    }
    
    .color-picker-wrapper {
        flex-direction: column;
    }
    
    #baseColor {
        width: 100px;
        height: 100px;
    }
}