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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --error-color: #ef4444;
    --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);
}

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

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

.header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.nav {
    display: flex;
    gap: 2rem;
}

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

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

.hero {
    padding: 4rem 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 1rem;
    padding: 3rem;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--card-bg);
    max-width: 600px;
    margin: 0 auto;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(99, 102, 241, 0.05);
}

.upload-icon {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-area p {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-area .hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-top: 3rem;
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.ad-section {
    padding: 1.5rem 0;
}

.ad-banner {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    border-radius: 0.75rem;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 2px dashed #cbd5e1;
}

.ad-placeholder {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.features {
    padding: 4rem 0;
}

.features h2 {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 0.75rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    margin-bottom: 1.25rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.preview-section {
    padding: 4rem 0;
}

.preview-container {
    max-width: 1000px;
    margin: 0 auto;
}

.preview-container h3 {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 2rem;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem;
    background-color: var(--card-bg);
    border-radius: 1rem;
    color: var(--text-secondary);
}

.empty-state svg {
    margin-bottom: 1rem;
}

.image-card {
    background-color: var(--card-bg);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.image-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.image-info {
    padding: 1rem;
}

.image-info h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.image-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.progress-bar {
    height: 6px;
    background-color: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    border-radius: 3px;
    transition: width 0.3s ease;
}

.image-actions {
    display: flex;
    gap: 0.5rem;
}

.btn {
    flex: 1;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: #cbd5e1;
}

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

.btn-success:hover {
    background-color: #059669;
}

.settings {
    padding: 4rem 0;
    background-color: var(--card-bg);
}

.settings h2 {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.setting-item {
    background-color: var(--bg-color);
    padding: 1.5rem;
    border-radius: 1rem;
}

.setting-item label {
    display: block;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

#qualitySlider {
    flex: 1;
    height: 8px;
    border-radius: 4px;
    background-color: var(--border-color);
    appearance: none;
    cursor: pointer;
}

#qualitySlider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    cursor: pointer;
}

#qualityValue {
    min-width: 50px;
    text-align: right;
    font-weight: 600;
    color: var(--primary-color);
}

.format-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.format-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

.format-option:hover {
    background-color: rgba(99, 102, 241, 0.05);
}

.format-option input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

.format-option span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.setting-item select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background-color: var(--card-bg);
    font-size: 0.9rem;
    color: var(--text-primary);
    cursor: pointer;
}

.setting-item select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.setting-hint {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.how-it-works {
    padding: 4rem 0;
    background-color: var(--card-bg);
}

.how-it-works h2 {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

.steps {
    display: flex;
    justify-content: center;
    gap: 4rem;
}

.step {
    text-align: center;
    max-width: 200px;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.step p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer {
    background-color: var(--text-primary);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

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

.footer-section ul {
    list-style: none;
}

.footer-section li {
    padding: 0.5rem 0;
}

.footer-section a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.2s ease;
}

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

.footer-section p {
    color: #94a3b8;
    font-size: 0.9rem;
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding-top: 2rem;
    text-align: center;
    color: #64748b;
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .steps {
        flex-direction: column;
        gap: 2rem;
    }

    .step {
        max-width: 100%;
    }

    .upload-area {
        padding: 2rem 1rem;
    }
}

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--text-primary);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    transform: translateX(120%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

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

.toast.success {
    background-color: var(--success-color);
}

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