:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #242424;
    --text-primary: #e5e5e5;
    --text-secondary: #a0a0a0;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --border: #333;
    --error: #ef4444;
    --success: #22c55e;
    --radius: 8px;
    --radius-lg: 12px;
}

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

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

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

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 15, 15, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: opacity 0.3s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.loading-hint {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

main {
    display: grid;
    gap: 2rem;
}

section {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border);
}

h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.input-tabs, .output-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tab-btn, .output-tab-btn {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

.tab-btn:hover, .output-tab-btn:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}

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

.tab-content {
    display: none;
}

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

.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.05);
}

.drop-zone-content svg {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.drop-zone-content .link {
    color: var(--accent);
    text-decoration: underline;
}

.drop-zone-content .hint {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.image-preview-container {
    position: relative;
    display: inline-block;
    max-width: 100%;
}

.image-preview-container.hidden {
    display: none;
}

#image-preview {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius);
    display: block;
}

.clear-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.7);
    border: none;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
}

.clear-btn:hover {
    background: var(--error);
}

#text-content {
    width: 100%;
    min-height: 150px;
    padding: 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: 'Cascadia Code', 'Consolas', monospace;
    font-size: 1rem;
    resize: vertical;
}

#text-content:focus {
    outline: none;
    border-color: var(--accent);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-group.hidden {
    display: none;
}

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

.option-group label span {
    color: var(--accent);
    font-weight: 500;
}

.option-group select,
.option-group input[type="text"],
.option-group input[type="number"] {
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.option-group select:focus,
.option-group input[type="text"]:focus,
.option-group input[type="number"]:focus {
    outline: none;
    border-color: var(--accent);
}

.option-group input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    appearance: none;
    cursor: pointer;
}

.option-group input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

.option-group input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

.color-input-wrapper {
    display: flex;
    gap: 0.5rem;
}

.color-input-wrapper input[type="text"] {
    flex: 1;
}

.color-input-wrapper input[type="color"] {
    width: 36px;
    height: 36px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    background: var(--bg-tertiary);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-primary) !important;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

.generate-btn {
    width: 100%;
    padding: 1rem;
    background: var(--accent);
    border: none;
    border-radius: var(--radius);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.generate-btn:hover:not(:disabled) {
    background: var(--accent-hover);
}

.generate-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.generate-btn .btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.generate-btn .btn-loading.hidden {
    display: none;
}

.generate-btn .btn-text.hidden {
    display: none;
}

.btn-spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.output-section.hidden {
    display: none;
}

.output-content {
    display: none;
}

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

.output-info {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.art-preview {
    overflow: auto;
    max-height: 70vh;
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    padding: 1rem;
}

.output-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.action-btn {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.code-block {
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    padding: 1rem;
    overflow: auto;
    max-height: 400px;
    font-family: 'Cascadia Code', 'Consolas', monospace;
    font-size: 0.75rem;
    line-height: 1.5;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-break: break-all;
}

.code-block.plaintext {
    font-size: 0.5rem;
    line-height: 1;
    white-space: pre;
    word-break: normal;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    border-radius: var(--radius);
    padding: 1rem;
    color: var(--error);
    margin-top: 1rem;
}

.error-message.hidden {
    display: none;
}

footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 1.75rem;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .drop-zone {
        padding: 2rem 1rem;
    }
}