:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --success: #10b981;
    --success-dark: #059669;
    --secondary: #6b7280;
    --background: #f9fafb;
    --surface: #ffffff;
    --text: #1f2937;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    text-align: center;
    color: white;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
}

main {
    background: var(--surface);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.upload-zone {
    border: 3px dashed var(--border);
    border-radius: 12px;
    padding: 60px 40px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    background: var(--background);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: #eff6ff;
    transform: scale(1.02);
}

.upload-content {
    pointer-events: none;
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    color: var(--primary);
}

.upload-zone h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text);
}

.upload-zone p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    pointer-events: auto;
}

.btn svg {
    width: 20px;
    height: 20px;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-success:hover {
    background: var(--success-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: #4b5563;
    transform: translateY(-2px);
}

.processing {
    text-align: center;
    padding: 40px;
}

.spinner {
    width: 64px;
    height: 64px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

#status-text {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--success));
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    color: var(--text-light);
    font-size: 0.9rem;
}

.results {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.results-header {
    text-align: center;
    margin-bottom: 30px;
}

.results-header h2 {
    font-size: 1.8rem;
    color: var(--success);
    margin-bottom: 10px;
}

#results-summary {
    color: var(--text-light);
    font-size: 1.1rem;
}

.github-config {
    background: var(--background);
    border-left: 4px solid var(--primary);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.github-config h3 {
    margin-bottom: 10px;
    color: var(--text);
    font-size: 1.2rem;
}

.github-config p {
    color: var(--text-light);
    margin-bottom: 15px;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-bottom: 10px;
}

.github-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    font-family: monospace;
    transition: border-color 0.3s ease;
}

.github-input:focus {
    outline: none;
    border-color: var(--primary);
}

.url-suffix {
    font-family: monospace;
    color: var(--primary);
    font-weight: 600;
    white-space: nowrap;
}

.help-text {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 10px;
}

.help-text code {
    background: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--primary);
    border: 1px solid var(--border);
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.image-item {
    aspect-ratio: 1;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
    cursor: pointer;
}

.image-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

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

.actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.info-box {
    background: var(--background);
    border-left: 4px solid var(--primary);
    padding: 20px;
    border-radius: 8px;
}

.info-box h3 {
    margin-bottom: 15px;
    color: var(--text);
}

.info-box ol {
    margin-left: 20px;
}

.info-box li {
    margin-bottom: 8px;
    color: var(--text-light);
}

.info-box code {
    background: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--primary);
    border: 1px solid var(--border);
}

footer {
    text-align: center;
    color: white;
    margin-top: 30px;
    opacity: 0.9;
    font-size: 0.95rem;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 2rem;
    }

    main {
        padding: 20px;
    }

    .upload-zone {
        padding: 40px 20px;
    }

    .actions {
        flex-direction: column;
    }

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

    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 10px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    main {
        padding: 15px;
    }
}