/* ================================================================
   BOOKMARKS — button (subject pages) + hub section
   ================================================================ */

/* ---- Bookmark toggle button on topic cards ---- */
.bookmark-btn {
    position: absolute;
    top: 8px;
    left: 8px;
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.35;
    transition: opacity 0.2s, transform 0.2s;
    z-index: 2;
    padding: 4px;
    color: var(--text-light, #6c757d);
    line-height: 1;
}
.bookmark-btn:hover {
    opacity: 0.8;
    transform: scale(1.15);
}
.bookmark-btn.active {
    opacity: 1;
}
.bookmark-btn.active svg {
    fill: var(--primary, #4a90d9);
    stroke: var(--primary, #4a90d9);
}

/* ---- Hub: My Study List section ---- */
.bookmarks-section {
    margin-bottom: 28px;
}
.bookmarks-section h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text, #2b2d42);
    margin-bottom: 14px;
}

.bookmarks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.bookmark-card {
    display: block;
    position: relative;
    background: var(--card, #ffffff);
    border-radius: var(--radius, 16px);
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    padding: 14px 16px;
    padding-right: 36px;
    text-decoration: none;
    color: inherit;
    border-left: 4px solid var(--primary, #4361ee);
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}
.bookmark-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
}

.bookmark-subject {
    display: block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.bookmark-title {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text, #2b2d42);
    margin-bottom: 4px;
    line-height: 1.3;
}

.bookmark-type {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 8px;
    background: var(--primary-light, #eef0ff);
    color: var(--primary, #4361ee);
}

.bookmark-remove {
    position: absolute;
    top: 8px;
    right: 8px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    color: var(--text-light, #6c757d);
    opacity: 0.5;
    transition: opacity 0.2s, color 0.2s;
    padding: 2px 6px;
}
.bookmark-remove:hover {
    opacity: 1;
    color: var(--error);
}

/* ---- Dark mode ---- */
body.dark-mode .bookmarks-section h2 { color: var(--text); }
body.dark-mode .bookmark-card {
    background: var(--card);
    box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}
body.dark-mode .bookmark-title { color: var(--text); }

/* ---- Wallpaper glassmorphism ---- */
body.has-bg .bookmark-card {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}
body.dark-mode.has-bg .bookmark-card {
    background: rgba(22,33,62,0.88);
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
    .bookmarks-grid {
        grid-template-columns: 1fr;
    }
}