:root {
    --bg: #f7f7f8;
    --surface: #ffffff;
    --border: #e2e2e6;
    --text: #1b1b1f;
    --muted: #6b6b76;
    --accent: #2f6fed;
    --accent-contrast: #ffffff;
    --danger: #d64545;
    --radius: 10px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #17181c;
        --surface: #1f2025;
        --border: #303138;
        --text: #ececef;
        --muted: #9a9aa5;
        --accent: #6d97ff;
        --accent-contrast: #10131a;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.45;
}

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

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); }
.topnav { display: flex; gap: 16px; align-items: center; }

.link-button {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font: inherit;
    padding: 4px 8px;
}
.link-button:hover { text-decoration: underline; }
.inline-form { display: inline; }

main { max-width: 1200px; margin: 0 auto; padding: 20px 24px 60px; }
main.compact-main { padding: 4px 24px 8px; }

.browse-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 28px;
    align-items: start;
}

.sidebar h2 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
    margin: 20px 0 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.sidebar h2:first-child { margin-top: 0; }
.sidebar h2 .manage-link { text-transform: none; letter-spacing: normal; font-size: 0.75rem; }

.category-tree, .tag-list { list-style: none; margin: 0; padding: 0; }
.tag-list { max-height: 280px; overflow-y: auto; }
.category-tree li, .tag-list li { margin: 2px 0; }
.category-tree a, .tag-list a {
    color: var(--text);
    display: block;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.9rem;
}
.category-tree a:hover, .tag-list a:hover { background: var(--border); text-decoration: none; }
.category-tree a.active, .tag-list a.active { background: var(--accent); color: var(--accent-contrast); }
.tag-list .count { color: var(--muted); font-size: 0.8em; }
.tag-list a.active .count { color: inherit; opacity: 0.8; }

.filter-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.filter-bar input[type="search"] {
    flex: 1;
    min-width: 200px;
}
.view-toggle { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.view-toggle button {
    border: none;
    background: var(--surface);
    color: var(--text);
    padding: 8px 14px;
    cursor: pointer;
}
.view-toggle button.active { background: var(--accent); color: var(--accent-contrast); }

.active-tag-filters {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 0.85rem;
    color: var(--muted);
}
.active-tag-filters .tag-chip { background: var(--accent); color: var(--accent-contrast); border-color: var(--accent); }

input, select, textarea, button {
    font: inherit;
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
}
button { cursor: pointer; }
button.secondary { background: var(--border); }
button[type="submit"]:not(.view-toggle button) {
    background: var(--accent);
    color: var(--accent-contrast);
    border-color: var(--accent);
}

.empty-state { color: var(--muted); padding: 40px 0; text-align: center; }

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.card-image img { width: 100%; height: 140px; object-fit: cover; display: block; }
.card-body { padding: 14px; display: flex; flex-direction: column; gap: 8px; }
.card-header { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 0.8rem; }
.card h3 { margin: 0; font-size: 1rem; }
.card-description { margin: 0; color: var(--muted); font-size: 0.88rem; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-meta { display: flex; flex-wrap: wrap; gap: 6px; }
.card-footer { display: flex; align-items: center; gap: 12px; font-size: 0.8rem; color: var(--muted); margin-top: auto; }

.category-chip, .tag-chip {
    display: inline-block;
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--border);
    color: var(--text);
}
.tag-chip { background: transparent; border: 1px solid var(--border); }

.link-table { width: 100%; border-collapse: collapse; }
.link-table td { padding: 8px 6px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.link-table .fav img { display: block; }
.link-table .main { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.link-title { font-weight: 600; }
.link-domain { color: var(--muted); font-size: 0.8rem; }
.link-table .date { color: var(--muted); font-size: 0.8rem; white-space: nowrap; }
.link-table .actions { white-space: nowrap; font-size: 0.85rem; display: flex; gap: 10px; }

.auth-page, .install-page, .manage-page { max-width: 480px; margin: 40px auto; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.install-page, .manage-page { max-width: 640px; }

.add-page { max-width: 480px; margin: 4px auto 16px; padding: 0 20px; }
.add-page h1 { margin-top: 0; margin-bottom: 12px; font-size: 1.4rem; }

.inline-category-form { display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap; }
.inline-category-form input[type="text"] { flex: 1; min-width: 160px; }

.category-manage-list { list-style: none; margin: 0 0 20px; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.category-manage-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.category-manage-row .cat-name { flex: 1; min-width: 120px; }

.stacked-form { display: flex; flex-direction: column; gap: 12px; }
.stacked-form label { display: flex; flex-direction: column; gap: 3px; font-size: 0.9rem; color: var(--muted); }
.stacked-form input, .stacked-form select, .stacked-form textarea { color: var(--text); }
.form-actions { display: flex; gap: 10px; }

.fetch-row { display: flex; align-items: center; gap: 10px; }
.fetch-row button { flex-shrink: 0; }

.toast {
    position: fixed;
    top: 54px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: var(--accent-contrast);
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
    z-index: 100;
    white-space: nowrap;
}
.toast.hidden { display: none; }

.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 0.85rem; }
.error { color: var(--danger); font-size: 0.9rem; }

.tag-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: -6px; }
.tag-chips .chip { display: inline-flex; align-items: center; gap: 6px; background: var(--border); padding: 3px 10px; border-radius: 999px; font-size: 0.85rem; }
.tag-chips .chip button { border: none; background: none; padding: 0; color: var(--muted); cursor: pointer; font-size: 1rem; line-height: 1; }

.new-category-fields { display: flex; flex-direction: column; gap: 14px; padding: 12px; border: 1px dashed var(--border); border-radius: 8px; }

.bookmarklet-button {
    display: inline-block;
    background: var(--accent);
    color: var(--accent-contrast);
    padding: 10px 18px;
    border-radius: 999px;
    font-weight: 600;
    cursor: grab;
}

@media (max-width: 720px) {
    .browse-layout { grid-template-columns: 1fr; }
    .sidebar { display: flex; flex-wrap: wrap; gap: 24px; }
}