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

:root {
    --primary-color: #000;
    --primary-hover: #333;
    --secondary-color: #f5f5f5;
    --accent-color: #6366f1;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --background: #ffffff;
    --background-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Header Styles */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.nav {
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand .logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-menu a:hover {
    color: var(--text-primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.language-selector {
    position: relative;
}

.language-select {
    appearance: none;
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.5rem 2rem 0.5rem 0.75rem;
    font-size: 0.875rem;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
}

.pro-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-xl);
    padding: 0.625rem 1.25rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.pro-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

/* Main Content */
.main {
    min-height: calc(100vh - 80px);
}

/* Hero Section */
.hero {
    padding: 4rem 0 6rem;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    text-align: center;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Generator Card */
.generator-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.input-section {
    position: relative;
    margin-bottom: 1.5rem;
}

.prompt-input {
    width: 100%;
    min-height: 120px;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.2s ease;
}

.prompt-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.surprise-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.surprise-btn:hover {
    background: var(--border-color);
}

.options-section {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.option-group {
    display: flex;
    gap: 0.75rem;
    flex: 1;
}

.option-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 0.875rem 1rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 120px;
    justify-content: center;
    height: 56px;
}

.option-btn .selected-value {
    font-size: 0.75rem;
    opacity: 0.8;
    margin-left: 0.25rem;
}

.option-btn:hover {
    border-color: var(--accent-color);
    background: rgba(99, 102, 241, 0.05);
}

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

.generate-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 140px;
    justify-content: center;
}

.generate-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.generate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s ease;
}

.modal-close:hover {
    background: var(--background-secondary);
}

.style-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.75rem;
    padding: 1.5rem;
}

.style-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem 0.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    min-height: 80px;
    background: white;
    font-size: 0.75rem;
}

.style-item:hover {
    border-color: var(--accent-color);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.style-item.active {
    border-color: #8b5cf6;
    background: linear-gradient(135deg, #8b5cf6 0%, #a855f7 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.style-preview {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    margin-bottom: 0.375rem;
    position: relative;
    overflow: hidden;
}

/* 为每种风格添加独特的图示 */
.style-item[data-style="traditional"] .style-preview {
    background: linear-gradient(135deg, #8B4513 0%, #A0522D 50%, #8B4513 100%);
}

.style-item[data-style="traditional"] .style-preview::after {
    content: "⚓";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 16px;
    color: white;
}

.style-item[data-style="realistic"] .style-preview {
    background: linear-gradient(135deg, #2C2C2C 0%, #4A4A4A 50%, #2C2C2C 100%);
}

.style-item[data-style="realistic"] .style-preview::after {
    content: "🦅";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 14px;
}

.style-item[data-style="minimalist"] .style-preview {
    background: linear-gradient(135deg, #E5E7EB 0%, #F3F4F6 50%, #E5E7EB 100%);
    border: 1px solid #D1D5DB;
}

.style-item[data-style="minimalist"] .style-preview::after {
    content: "○";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 12px;
    color: #6B7280;
    font-weight: bold;
}

.style-item[data-style="geometric"] .style-preview {
    background: linear-gradient(45deg, #667eea 25%, transparent 25%, transparent 75%, #667eea 75%, #667eea), linear-gradient(45deg, #667eea 25%, transparent 25%, transparent 75%, #667eea 75%, #667eea);
    background-size: 8px 8px;
    background-position: 0 0, 4px 4px;
}

.style-item[data-style="watercolor"] .style-preview {
    background: linear-gradient(135deg, #FF6B6B 0%, #4ECDC4 25%, #45B7D1 50%, #96CEB4 75%, #FFEAA7 100%);
    background-size: 200% 200%;
    animation: watercolor 3s ease-in-out infinite;
}

@keyframes watercolor {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.style-item[data-style="tribal"] .style-preview {
    background: linear-gradient(135deg, #1a1a1a 0%, #333333 100%);
}

.style-item[data-style="tribal"] .style-preview::after {
    content: "🔺";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 12px;
    color: white;
}

/* Results Section */
.results-section {
    margin-top: 3rem;
    padding: 2rem;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.results-section h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.75rem;
    font-weight: 600;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.result-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--background-secondary);
}

.result-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.download-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.download-btn:hover {
    background: #5b5fef;
}

.result-image {
    aspect-ratio: 1;
    background: var(--background-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.result-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.loading-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Features Section */
.features {
    padding: 6rem 0;
    background: var(--background-secondary);
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand .logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-brand p {
    color: #9ca3af;
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-section a {
    display: block;
    color: #9ca3af;
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: color 0.2s ease;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid #374151;
    text-align: center;
    color: #9ca3af;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        order: 3;
        width: 100%;
        justify-content: center;
    }
    
    .nav-actions {
        order: 2;
    }
    
    .hero {
        padding: 2rem 0 4rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .generator-card {
        padding: 1.5rem;
    }
    
    .options-section {
        flex-direction: column;
        align-items: stretch;
    }
    
    .option-group {
        width: 100%;
    }
    
    .generate-btn {
        width: 100%;
    }
    
    .surprise-btn {
        position: static;
        margin-top: 1rem;
        align-self: flex-start;
    }
    
    .input-section {
        display: flex;
        flex-direction: column;
    }
    
    .features h2 {
        font-size: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .modal-content {
        margin: 1rem;
    }
    
    .style-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
        padding: 1rem;
    }
    
    .style-item {
        padding: 1rem 0.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .generator-card {
        padding: 1rem;
    }
    
    .option-btn {
        min-width: auto;
        flex: 1;
    }
    
    .style-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}