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

:root {
    --bg-color: #1a1a2e;
    --card-bg: #16213e;
    --text-color: #eaeaea;
    --text-muted: #888;
    --accent-color: #0f3460;
    --primary-color: #e94560;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --danger-color: #f44336;
    --border-color: #2a2a4a;
    --input-bg: #0f0f1a;
}

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

header {
    background: linear-gradient(135deg, var(--accent-color), var(--card-bg));
    padding: 2rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

header .subtitle {
    color: var(--text-muted);
    font-size: 1rem;
}

nav.tabs {
    display: flex;
    gap: 0;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0 1rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-size: 1rem;
    border-bottom: 3px solid transparent;
    transition: all 0.2s;
}

.tab-btn:hover {
    color: var(--text-color);
    background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

main {
    flex: 1;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.status-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.image-card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.image-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.image-card h3 {
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.image-card .uuid {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: monospace;
    margin-bottom: 1rem;
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
}

.status-pending {
    background: var(--warning-color);
    color: #000;
}

.status-building {
    background: #2196f3;
    color: #fff;
}

.status-completed {
    background: var(--success-color);
    color: #fff;
}

.status-failed {
    background: var(--danger-color);
    color: #fff;
}

.image-meta {
    margin: 1rem 0;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.image-meta span {
    display: block;
    margin-bottom: 0.25rem;
}

.image-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: #d63850;
}

.btn-secondary {
    background: var(--accent-color);
    color: #fff;
}

.btn-secondary:hover {
    background: #1a4a7a;
}

.btn-danger {
    background: var(--danger-color);
    color: #fff;
}

.btn-danger:hover {
    background: #d32f2f;
}

.btn-small {
    padding: 0.35rem 0.75rem;
    font-size: 0.85rem;
}

/* Upload Form */
.upload-form {
    max-width: 700px;
}

.upload-form h2 {
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input[type="text"],
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    font-size: 1rem;
    font-family: inherit;
}

.form-group textarea {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    resize: vertical;
}

.form-group input[type="file"] {
    padding: 0.5rem 0;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.status-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 4px;
    display: none;
}

.status-message.success {
    display: block;
    background: rgba(76, 175, 80, 0.2);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.status-message.error {
    display: block;
    background: rgba(244, 67, 54, 0.2);
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    max-width: 700px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.modal-small {
    max-width: 400px;
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

.close-btn:hover {
    color: var(--text-color);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    justify-content: flex-end;
}

.dockerfile-preview {
    background: var(--input-bg);
    padding: 1rem;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9rem;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 300px;
    overflow-y: auto;
    margin-top: 1rem;
}

.error-message {
    background: rgba(244, 67, 54, 0.2);
    border: 1px solid var(--danger-color);
    padding: 1rem;
    border-radius: 4px;
    margin-top: 1rem;
    color: var(--danger-color);
}

/* Loading */
.loading {
    color: var(--text-muted);
    text-align: center;
    padding: 2rem;
}

footer {
    text-align: center;
    padding: 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }

    main {
        padding: 1rem;
    }

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

    .tab-btn {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
}