/* ===== MathHub Textbook UX Features ===== */
/* Dark Mode, Progress Tracking, Bookmarks, Print CSS */

/* ─── Dark Mode Toggle Button ─── */
.ux-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    position: fixed;
    bottom: 24px;
    right: 20px;
    z-index: 9999;
    flex-direction: column;
}

.ux-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    font-size: 1.2em;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.18);
    transition: transform 0.15s, box-shadow 0.15s;
    background: #fff;
    color: #334155;
}

.ux-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 4px 14px rgba(0,0,0,0.22);
}

.ux-btn.active {
    background: #3b82f6;
    color: #fff;
}

/* ─── Reading Progress Bar ─── */
#reading-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
    width: 0%;
    z-index: 10000;
    transition: width 0.1s linear;
}

/* ─── Chapter Read Badge ─── */
.chapter-read-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #dcfce7;
    color: #15803d;
    font-size: 0.82em;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    margin-left: 12px;
    vertical-align: middle;
}

/* ─── Bookmark Icons on Headings ─── */
.bookmark-btn {
    display: inline-block;
    margin-left: 8px;
    cursor: pointer;
    font-size: 0.75em;
    opacity: 0;
    transition: opacity 0.15s;
    vertical-align: middle;
    background: none;
    border: none;
    padding: 2px 4px;
    border-radius: 4px;
    color: #94a3b8;
}

h2:hover .bookmark-btn,
h3:hover .bookmark-btn,
.bookmark-btn.bookmarked {
    opacity: 1;
}

.bookmark-btn.bookmarked {
    color: #f59e0b;
}

/* ─── Bookmarks Panel ─── */
#bookmarks-panel {
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 280px;
    max-height: 400px;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.14);
    overflow-y: auto;
    z-index: 9998;
    display: none;
    padding: 16px;
}

#bookmarks-panel.open {
    display: block;
}

#bookmarks-panel h4 {
    font-size: 0.9em;
    color: #1e3a5f;
    margin: 0 0 12px;
    font-weight: 700;
}

#bookmarks-panel ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#bookmarks-panel li {
    padding: 6px 0;
    border-bottom: 1px solid #f1f5f9;
    font-size: 0.85em;
}

#bookmarks-panel li:last-child {
    border-bottom: none;
}

#bookmarks-panel a {
    color: #3b82f6;
    text-decoration: none;
    display: block;
    line-height: 1.4;
}

#bookmarks-panel a:hover {
    text-decoration: underline;
}

#bookmarks-panel .bm-source {
    color: #94a3b8;
    font-size: 0.8em;
}

#bookmarks-panel .bm-remove {
    float: right;
    cursor: pointer;
    color: #e2e8f0;
    font-size: 1.1em;
    line-height: 1;
    padding: 0 2px;
}

#bookmarks-panel .bm-remove:hover {
    color: #ef4444;
}

#bookmarks-panel .empty-msg {
    color: #94a3b8;
    font-size: 0.88em;
    text-align: center;
    padding: 12px 0;
}

/* ─── Dark Mode ─── */
body.dark-mode {
    background-color: #0f172a;
    color: #e2e8f0;
}

body.dark-mode .global-nav {
    background: #0a0f1e;
}

body.dark-mode .blog-article h1,
body.dark-mode .blog-article h2,
body.dark-mode .blog-article h3 {
    color: #93c5fd;
}

body.dark-mode .blog-article p,
body.dark-mode .blog-article li,
body.dark-mode .blog-article ul,
body.dark-mode .blog-article ol {
    color: #cbd5e1;
}

body.dark-mode .blog-meta {
    color: #64748b;
    border-bottom-color: #1e293b;
}

body.dark-mode .blog-article h2 {
    border-top-color: #1e293b;
}

body.dark-mode .learning-objectives {
    background: #1c1917;
    border-left-color: #f97316;
}

body.dark-mode .learning-objectives li {
    color: #fed7aa;
}

body.dark-mode .example-box {
    background: #0f172a;
    border-left-color: #3b82f6;
}

body.dark-mode .example-box p,
body.dark-mode .example-box li {
    color: #cbd5e1;
}

body.dark-mode .definition-box {
    background: #052e16;
    border-left-color: #22c55e;
}

body.dark-mode .definition-box p,
body.dark-mode .definition-box ol,
body.dark-mode .definition-box li {
    color: #bbf7d0;
}

body.dark-mode .theorem-box {
    background: #1e1b4b;
    border-left-color: #8b5cf6;
}

body.dark-mode .theorem-box p { color: #ddd6fe; }

body.dark-mode .try-it-box {
    background: #052e16;
    border-color: #16a34a;
}

body.dark-mode .try-it-box p { color: #bbf7d0; }

body.dark-mode .try-it-answer {
    background: #0f2016;
    color: #bbf7d0;
}

body.dark-mode .chapter-nav {
    background: #1e293b;
    border-radius: 8px;
}

body.dark-mode .chapter-nav a { color: #60a5fa; }
body.dark-mode .chapter-nav .disabled { color: #475569; }

body.dark-mode .footer {
    background: #020617;
    color: #475569;
}

body.dark-mode .breadcrumb { color: #475569; }
body.dark-mode .breadcrumb a { color: #60a5fa; }

body.dark-mode .key-term-item {
    background: #1e293b;
    border-color: #334155;
}

body.dark-mode .key-term-item strong { color: #93c5fd; }
body.dark-mode .key-term-item span { color: #94a3b8; }

body.dark-mode .summary-box,
body.dark-mode .chapter-summary {
    background: #1e293b;
}

body.dark-mode .summary-card {
    background: #0f172a;
    border-color: #334155;
}

body.dark-mode .summary-card strong { color: #93c5fd; }
body.dark-mode .summary-card p { color: #94a3b8; }

body.dark-mode .desmos-wrap {
    background: #1e293b;
    border-color: #334155;
}

body.dark-mode .fig-label { color: #475569; }

body.dark-mode #bookmarks-panel {
    background: #1e293b;
    border-color: #334155;
}

body.dark-mode #bookmarks-panel h4 { color: #93c5fd; }
body.dark-mode #bookmarks-panel li { border-bottom-color: #334155; }
body.dark-mode #bookmarks-panel a { color: #60a5fa; }

body.dark-mode .ux-btn {
    background: #1e293b;
    color: #e2e8f0;
}

body.dark-mode .ux-btn.active {
    background: #3b82f6;
    color: #fff;
}

/* ─── Print Styles ─── */
@media print {
    .global-nav,
    .ux-toolbar,
    #reading-progress-bar,
    #bookmarks-panel,
    .bookmark-btn,
    .try-it-box details summary,
    .chapter-nav,
    .adsbygoogle,
    script,
    .footer a {
        display: none !important;
    }

    body {
        background: #fff !important;
        color: #000 !important;
        font-size: 11pt;
        line-height: 1.6;
    }

    .blog-article {
        max-width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
    }

    .blog-article h1 {
        font-size: 18pt;
        color: #000 !important;
        margin-bottom: 6pt;
    }

    .blog-article h2 {
        font-size: 14pt;
        color: #000 !important;
        page-break-after: avoid;
        border-top: 1pt solid #ccc !important;
    }

    .blog-article h3 {
        font-size: 12pt;
        color: #000 !important;
        page-break-after: avoid;
    }

    .blog-article p,
    .blog-article li {
        color: #000 !important;
        orphans: 3;
        widows: 3;
    }

    .example-box,
    .definition-box,
    .theorem-box {
        border-left: 3pt solid #888 !important;
        background: #f9f9f9 !important;
        padding: 8pt 12pt !important;
        margin: 8pt 0 !important;
        page-break-inside: avoid;
    }

    .example-box h4,
    .definition-box h4,
    .theorem-box h4 {
        color: #000 !important;
    }

    .example-box p,
    .definition-box p,
    .theorem-box p,
    .example-box li,
    .definition-box li {
        color: #000 !important;
    }

    .learning-objectives {
        border-left: 3pt solid #f97316 !important;
        background: #fff8f0 !important;
        page-break-inside: avoid;
    }

    .learning-objectives li { color: #000 !important; }

    .try-it-box {
        border: 1pt dashed #aaa !important;
        background: #f9f9f9 !important;
        page-break-inside: avoid;
    }

    .try-it-box p { color: #000 !important; }

    .try-it-answer { display: block !important; }

    .desmos-wrap { display: none !important; }

    .key-terms-grid {
        display: block !important;
    }

    .key-term-item {
        border: 1pt solid #ccc !important;
        padding: 6pt !important;
        margin-bottom: 6pt !important;
        page-break-inside: avoid;
    }

    .summary-grid {
        display: block !important;
    }

    .summary-card {
        border: 1pt solid #ccc !important;
        padding: 6pt !important;
        margin-bottom: 6pt !important;
        page-break-inside: avoid;
    }

    a[href]:after {
        content: none !important;
    }
}