:root {
    --bg-color: #f5f5f5;
    --container-bg: white;
    --text-color: #333;
    --border-color: #dee2e6;
    --input-bg: white;
    --input-border: #ddd;
    --button-bg: #3498db;
    --button-hover: #2980b9;
    --button-disabled: #95a5a6;
    --preview-bg: #f8f9fa;
    --preview-border: #dee2e6;
    --success-color: #2ecc71;
    --error-bg: #f8d7da;
    --error-color: #721c24;
    --error-border: #f5c6cb;
    --pattern-bg: #e9ecef;
    --pattern-hover: #dee2e6;
    --pattern-active: #ced4da;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 1rem;
}

.fixed-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0.5rem 0;
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.header-buttons {
    display: flex;
    align-items: center;
    position: absolute;
    top: 0.5rem;
    right: 2rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 1.5rem;
    background-color: var(--container-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow-color);
    flex: 1;
}

h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: #2c3e50;
}

h3 {
    margin: 1rem 0;
    color: #2c3e50;
}

.input-section {
    margin-bottom: 2rem;
}

textarea {
    width: 100%;
    height: 200px;
    padding: 1rem;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    resize: vertical;
    margin-bottom: 1rem;
    font-family: monospace;
    background-color: var(--input-bg);
    color: var(--text-color);
}

.filename-customization {
    margin: 1rem 0;
    font-size: 0.9rem;
}

.filename-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem;
    color: #666;
}

.filename-toggle input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.filename-content {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background-color: #f8f9fa;
    border-radius: 4px;
    border: 1px solid #dee2e6;
}

.filename-preview {
    margin-bottom: 0.5rem;
    padding: 0.25rem;
    font-size: 0.85rem;
    color: #666;
}

.filename-pattern {
    margin-bottom: 0.5rem;
}

#filenamePattern {
    width: 100%;
    padding: 0.25rem;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    font-size: 0.9rem;
}

.pattern-options {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.pattern-option {
    padding: 0.25rem 0.5rem;
    background-color: var(--pattern-bg);
    border: 1px solid var(--preview-border);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--text-color);
    transition: all 0.2s;
}

.pattern-option:hover {
    background-color: var(--pattern-hover);
}

.pattern-option:active {
    background-color: var(--pattern-active);
}

.pattern-help {
    background-color: white;
    padding: 1rem;
    border-radius: 4px;
    border: 1px solid #ddd;
    font-size: 0.9rem;
}

.pattern-help ul {
    margin-left: 1rem;
    margin-top: 0.5rem;
}

.pattern-help code {
    background-color: #f8f9fa;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: monospace;
}

button {
    display: block;
    width: 100%;
    padding: 1rem;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

button:hover {
    background-color: var(--button-hover);
}

button:disabled {
    background-color: var(--button-disabled);
    cursor: not-allowed;
}

.progress-section {
    margin-bottom: 2rem;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background-color: #ecf0f1;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress {
    width: 0%;
    height: 100%;
    background-color: #2ecc71;
    transition: width 0.3s ease;
}

.progress-details {
    text-align: center;
}

.progress-details p {
    margin: 0.5rem 0;
    font-size: 0.9rem;
}

#status {
    font-weight: bold;
    color: #2c3e50;
}

#progressText {
    color: #3498db;
    font-size: 1.1rem;
}

#countText {
    color: #7f8c8d;
}

.download-link-container {
    text-align: center;
    margin-top: 2rem;
}

.download-zip {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: #2ecc71;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.download-zip:hover {
    background-color: #27ae60;
}

.url-limit-warning,
.size-limit-warning {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    text-align: right;
}

.filename-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding: 0.5rem;
    background-color: #f8f9fa;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.toggle-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: #666;
    cursor: pointer;
    padding: 0.2rem 0.5rem;
}

.error-message {
    background-color: var(--error-bg);
    color: var(--error-color);
    padding: 0.75rem;
    margin: 0.5rem 0;
    border-radius: 4px;
    border: 1px solid var(--error-border);
    font-size: 0.9rem;
    white-space: pre-line;
}

.error-message::before {
    content: "⚠️";
    margin-right: 0.5rem;
}

.preview-section {
    margin: 1rem 0;
    padding: 1rem;
    background-color: var(--preview-bg);
    border-radius: 4px;
    border: 1px solid var(--preview-border);
}

.preview-section h3 {
    margin: 0 0 1rem 0;
    font-size: 1rem;
    color: #495057;
}

.preview-customization {
    margin: 1rem 0;
    font-size: 0.9rem;
}

.preview-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem;
    color: #666;
}

.preview-toggle input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.preview-content {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background-color: #f8f9fa;
    border-radius: 4px;
    border: 1px solid #dee2e6;
}

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

.preview-progress .progress-bar {
    flex: 1;
    height: 8px;
    background-color: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
}

.preview-progress .progress {
    height: 100%;
    background-color: #3498db;
    width: 0%;
    transition: width 0.3s ease;
}

.preview-progress .progress-text {
    font-size: 0.8rem;
    color: #666;
    min-width: 40px;
    text-align: right;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
    max-height: 300px;
    overflow-y: auto;
    padding: 0.5rem;
}

.preview-grid.collapsed {
    max-height: 150px;
    overflow: hidden;
}

.preview-item {
    position: relative;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
    background-color: var(--container-bg);
    border: 1px solid var(--border-color);
}

.preview-item:hover {
    transform: scale(1.02);
}

.preview-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    display: block;
}

.preview-item .remove-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background-color: rgba(220, 53, 69, 0.8);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.preview-item .remove-btn:hover {
    background-color: #dc3545;
}

.preview-item .url-text {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.25rem;
    font-size: 0.75rem;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.show-more-btn {
    display: block;
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.5rem;
    background-color: #e9ecef;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    color: #495057;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.show-more-btn:hover {
    background-color: #dee2e6;
    border-color: #ced4da;
}

.app-footer {
    background-color: var(--container-bg);
    padding: 1.5rem 0;
    margin-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1.5rem;
    text-align: center;
}

.footer-text {
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.footer-text strong {
    color: #2c3e50;
    font-weight: 600;
}

.footer-button {
    display: flex;
    justify-content: center;
    align-items: center;
}

.options-row {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.preview-customization,
.filename-customization {
    flex: 1;
    margin: 0;
}

.preview-toggle,
.filename-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem;
    color: #666;
    background-color: var(--preview-bg);
    border-radius: 4px;
    transition: background-color 0.2s;
}

.preview-toggle:hover,
.filename-toggle:hover {
    background-color: var(--pattern-hover);
}

.preview-toggle input[type="checkbox"],
.filename-toggle input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.preview-content,
.filename-content {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--preview-bg);
    border-radius: 4px;
    border: 1px solid var(--preview-border);
}