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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
    --gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient);
    -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;
}

/* Upload Section */
.upload-section {
    margin-bottom: 2rem;
}

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

.upload-box {
    position: relative;
    border-radius: 1rem;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.upload-box:hover {
    transform: translateY(-4px);
}

.upload-label {
    display: block;
    cursor: pointer;
    background: var(--surface);
    border: 2px dashed var(--border);
    border-radius: 1rem;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    min-height: 300px;
}

.upload-label:hover {
    border-color: var(--primary-color);
    background: var(--surface-light);
}

.upload-label.has-image {
    border-style: solid;
    border-color: var(--primary-color);
    padding: 0;
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-label.has-image .upload-content {
    display: none;
}

.upload-icon {
    width: 48px;
    height: 48px;
    stroke-width: 2;
    color: var(--primary-color);
}

.upload-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.upload-hint {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.preview-image {
    display: none;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 1rem;
}

.preview-image.visible {
    display: block;
}

/* Accessibility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Section Title */
.section-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* Settings Section */
.settings-section,
.preview-section,
.action-section {
    background: var(--surface);
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border);
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-item label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.setting-item input[type="range"],
.setting-item select {
    width: 100%;
    padding: 0.5rem;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-size: 1rem;
}

.setting-item input[type="range"] {
    cursor: pointer;
    height: 8px;
    padding: 0;
}

.setting-item input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
}

.setting-item input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
}

.setting-value {
    font-weight: 600;
    color: var(--primary-color);
    text-align: center;
}

/* Preview Section */
.preview-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

#previewCanvas {
    max-width: 100%;
    border-radius: 0.5rem;
    background: var(--background);
    box-shadow: 0 4px 6px var(--shadow);
}

.preview-controls {
    display: flex;
    gap: 1rem;
}

/* Buttons */
.action-section {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn-icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 6px var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px var(--shadow);
}

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

.btn-secondary {
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Progress Section */
.progress-section {
    text-align: center;
    padding: 2rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--surface);
    border-radius: 1rem;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background: var(--gradient);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 1rem;
}

.progress-text {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Info Section */
.info-section {
    background: var(--surface);
    border-radius: 1rem;
    padding: 3rem 2rem;
    margin: 3rem 0;
    border: 1px solid var(--border);
}

.info-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    text-align: center;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.info-section > p {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.feature-card {
    background: var(--background);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
    text-align: center;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

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

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

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

.use-cases {
    background: var(--background);
    padding: 2rem;
    border-radius: 1rem;
    margin-top: 2rem;
}

.use-cases h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.use-cases ul {
    list-style: none;
    padding: 0;
}

.use-cases li {
    padding: 0.75rem 0;
    color: var(--text-secondary);
    line-height: 1.8;
    border-bottom: 1px solid var(--border);
}

.use-cases li:last-child {
    border-bottom: none;
}

.use-cases li strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* FAQ Section */
.faq-section {
    background: var(--surface);
    border-radius: 1rem;
    padding: 3rem 2rem;
    margin: 3rem 0;
    border: 1px solid var(--border);
}

.faq-section h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.faq-item {
    background: var(--background);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-3px);
    border-color: var(--primary-color);
}

.faq-item h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-weight: 600;
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Footer */
footer {
    text-align: center;
    padding: 3rem 0 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border);
    margin-top: 3rem;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-content p {
    margin: 0.5rem 0;
}

.footer-links {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin: 1rem 0 !important;
}

.copyright {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: 1.5rem !important;
}

/* Drag and Drop */
.upload-label.drag-over {
    border-color: var(--primary-color);
    background: var(--surface-light);
    transform: scale(1.02);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.settings-section,
.preview-section,
.action-section {
    animation: fadeIn 0.5s ease;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .upload-grid {
        grid-template-columns: 1fr;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }

    .action-section {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .faq-grid {
        grid-template-columns: 1fr;
    }

    .info-section,
    .faq-section {
        padding: 2rem 1.5rem;
    }

    .info-section h2,
    .faq-section h2 {
        font-size: 1.5rem;
    }

    .feature-icon {
        font-size: 2.5rem;
    }

    .use-cases {
        padding: 1.5rem;
    }
}