:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --secondary: #6b7280;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --background: #ffffff;
    --surface: #f9fafb;
    --border: #e5e7eb;
    --text: #111827;
    --text-secondary: #6b7280;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

html, body {
    width: 360px;
    height: 500px;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text);
    background: var(--background);
    overflow: hidden;
}

header {
    padding: 12px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

header h1 {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
}

section {
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

h2 {
    font-size: 13px;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 8px;
}

.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 13px;
    background: var(--background);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

button {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

button#submit {
    width: 100%;
    background: var(--primary);
    color: white;
}

button#submit:hover {
    background: var(--primary-hover);
}

button#sync-btn,
button#settings-btn {
    width: 100%;
    padding: 8px;
    margin-bottom: 8px;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

button#sync-btn:hover,
button#settings-btn:hover {
    background: var(--border);
}

#search-filter {
    margin-bottom: 8px;
}

#search {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 13px;
}

.bookmark-item {
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 4px;
    margin-bottom: 8px;
    background: var(--surface);
}

.bookmark-item a {
    display: block;
    color: var(--primary);
    text-decoration: none;
    word-break: break-all;
    margin-bottom: 4px;
}

.bookmark-item a:hover {
    text-decoration: underline;
}

.bookmark-item .title {
    font-weight: 500;
    margin-bottom: 4px;
}

.bookmark-item .description {
    font-size: 12px;
    color: var(--text-secondary);
}

.bookmark-item .tags {
    margin-top: 4px;
    font-size: 11px;
    color: var(--secondary);
}

#collections-list {
    max-height: 150px;
    overflow-y: auto;
}

.collection-item {
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    margin-bottom: 4px;
    background: var(--surface);
    font-size: 12px;
}

.collection-item h3 {
    font-size: 13px;
    margin-bottom: 4px;
}

.collection-item p {
    color: var(--text-secondary);
    font-size: 11px;
}

#sync-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 4px;
}

.syncing {
    background: var(--warning);
    animation: pulse 1.5s infinite;
}

.synced {
    background: var(--success);
}

.error {
    background: var(--error);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

#last-sync {
    font-size: 11px;
    color: var(--text-secondary);
}

#bookmarks-container {
    max-height: 150px;
    overflow-y: auto;
}

#collections-panel,
#bookmark-list {
    max-height: 180px;
}

footer {
    padding: 12px;
    background: var(--surface);
    border-top: 1px solid var(--border);
}

footer button {
    width: 100%;
}