:root {
    /* Governing palette, same values as admin.css and presentation.css.
       Variable NAMES are unchanged from before this refactor since
       several PHP templates (glossary.php, glossary-term.php) reference
       them directly via inline var(--name) styles. */
    --navy: #264D73;          /* Dark Blue - header/nav/gate chrome */
    --forest: #336699;        /* Brand Blue - links, primary accents */
    --stone: #F5F7F9;         /* Subtle Alternate Background */
    --copper: #336699;        /* Brand Blue - highlight accents (learning
                                  objective border, callout labels, pills) */
    --ink: #1A1A1A;           /* Primary Text */
    --card-border: #D9DEE3;   /* Borders / Rules */
    --muted: #6B7280;         /* Secondary Text */
    --brand-blue-light: #DCE8F2;
}

* { box-sizing: border-box; }

body.student-body {
    margin: 0;
    background: var(--stone);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Georgia, serif;
}

.preview-banner {
    background: #5b3a29;
    color: #fff;
    text-align: center;
    padding: 10px 16px;
    font-size: 0.9rem;
}
.preview-banner a {
    color: #fff;
    text-decoration: underline;
    margin-left: 12px;
}

.site-header {
    background: var(--navy);
    color: #fff;
    padding: 40px 20px 32px;
}
.site-header-inner {
    max-width: 860px;
    margin: 0 auto;
    text-align: center;
}
.site-header h1 {
    margin: 0 0 12px;
    font-size: 3rem;
}
.site-header .professor-line {
    margin: 0 0 6px;
    color: var(--brand-blue-light);
    font-size: 0.95rem;
}
.site-header .professor-line a { color: #fff; }
.site-header .tagline {
    margin: 0;
    color: var(--brand-blue-light);
    font-size: 0.9rem;
}

.site-nav {
    background: var(--forest);
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 4px;
    padding: 6px;
    position: sticky;
    top: 0;
    z-index: 10;
}
.site-nav a {
    color: #fff;
    text-decoration: none;
    padding: 10px 16px;
    font-size: 0.9rem;
    border-radius: 4px;
}
.site-nav a:hover { background: rgba(255,255,255,0.15); }

.page-content {
    max-width: 860px;
    margin: 0 auto;
    padding: 32px 20px 64px;
}

.no-semester {
    text-align: center;
    color: var(--muted);
    padding: 48px 20px;
}

.schedule {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.class-row {
    background: #fff;
    border: 1px solid var(--card-border);
    border-radius: 4px;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.class-row .class-number {
    background: var(--navy);
    color: #fff;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.class-row .class-main {
    flex: 1 1 260px;
    min-width: 200px;
}
.class-row .class-title {
    margin: 0 0 4px;
    font-size: 1.1rem;
}
.class-row .class-date {
    margin: 0;
    color: var(--muted);
    font-size: 0.85rem;
}

.class-row .class-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.action-pill {
    display: inline-block;
    padding: 8px 14px;
    border-radius: 4px;
    font-size: 0.85rem;
    text-decoration: none;
    white-space: nowrap;
}
.action-pill.available {
    background: var(--copper);
    color: #fff;
}
.action-pill.unavailable {
    background: var(--stone);
    color: var(--muted);
    cursor: default;
    border: 1px solid var(--card-border);
}

@media (max-width: 640px) {
    .class-row {
        flex-direction: column;
        align-items: flex-start;
    }
    .class-row .class-actions {
        width: 100%;
    }
    .action-pill {
        flex: 1 1 auto;
        text-align: center;
    }
}

.gate-form {
    max-width: 360px;
    margin: 64px auto;
    background: #fff;
    border: 1px solid var(--card-border);
    border-radius: 4px;
    padding: 32px;
    text-align: center;
}
.gate-form input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--card-border);
    border-radius: 4px;
    margin: 6px 0 16px;
    font-size: 1rem;
}
.gate-form button {
    background: var(--navy);
    color: #fff;
    border: none;
    padding: 10px 24px;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
}
.gate-error { color: #B3261E; font-weight: 600; }

/* ===================== Reading / Long-Form Content ===================== */

:root[data-theme="dark"] {
    --stone: #1b1c1e;
    --ink: #e8e6e0;
    --card-border: #3a3b3d;
    --muted: #a8a29a;
    --navy: #7fa0c9;
    --forest: #4a7a5f;
}
:root[data-theme="dark"] body.student-body { background: #141516; }
:root[data-theme="dark"] .reading-article { background: #202123; color: #e8e6e0; }
:root[data-theme="dark"] .block-callout { background: #26282a; border-color: #3a3b3d; }
:root[data-theme="dark"] .site-header { background: #10182a; }

:root[data-font="sans"] .reading-article { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; }
:root[data-font="serif"] .reading-article { font-family: Georgia, "Times New Roman", Times, serif; }
:root[data-font="high-legibility"] .reading-article { font-family: Verdana, Tahoma, "Trebuchet MS", sans-serif; letter-spacing: 0.01em; }

:root[data-size="-2"] .reading-article { font-size: 0.85rem; }
:root[data-size="-1"] .reading-article { font-size: 0.925rem; }
:root[data-size="0"] .reading-article { font-size: 1rem; }
:root[data-size="1"] .reading-article { font-size: 1.15rem; }
:root[data-size="2"] .reading-article { font-size: 1.3rem; }
:root[data-size="3"] .reading-article { font-size: 1.45rem; }
:root[data-size="4"] .reading-article { font-size: 1.6rem; }

#readability-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    justify-content: center;
    background: #fff;
    border: 1px solid var(--card-border);
    border-radius: 4px;
    padding: 10px 14px;
    margin-bottom: 24px;
    font-size: 0.85rem;
}
:root[data-theme="dark"] #readability-controls { background: #202123; border-color: #3a3b3d; }
#readability-controls .group { display: flex; gap: 4px; align-items: center; }
#readability-controls button {
    background: var(--stone);
    border: 1px solid var(--card-border);
    border-radius: 4px;
    padding: 6px 10px;
    font-size: 0.85rem;
    cursor: pointer;
    color: inherit;
}
#readability-controls button[aria-pressed="true"] {
    background: var(--navy);
    color: #fff;
    border-color: var(--navy);
}
#readability-controls button:focus-visible {
    outline: 2px solid var(--copper);
    outline-offset: 1px;
}

.reading-article {
    max-width: 680px;
    margin: 0 auto;
    background: #fff;
    border-radius: 4px;
    padding: 40px 44px;
    line-height: 1.7;
}
:root[data-theme="dark"] .reading-article a { color: #9dc3ee; }

.reading-title-block { text-align: center; margin-bottom: 32px; }
.reading-title-block .reading-kicker {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.8rem;
    color: var(--muted);
    margin: 0 0 4px;
}
.reading-title-block h1 { margin: 0; }

.block-learning-objective {
    background: var(--stone);
    border-left: 4px solid var(--copper);
    padding: 16px 20px;
    margin: 24px 0;
    border-radius: 0 4px 4px 0;
}

.block-callout {
    background: var(--stone);
    border: 1px solid var(--card-border);
    border-radius: 4px;
    padding: 18px 22px;
    margin: 28px 0;
}
.block-callout .callout-label {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    color: var(--copper);
    margin: 0 0 10px;
}
.term-list dt { font-weight: 700; margin-top: 12px; }
.term-list dd { margin: 4px 0 0; }

.block-quotation {
    border-left: 4px solid var(--forest);
    margin: 24px 0;
    padding: 4px 0 4px 20px;
    font-style: italic;
}
.block-quotation cite { display: block; margin-top: 8px; font-style: normal; font-size: 0.85rem; color: var(--muted); }

.block-sources { margin-top: 40px; border-top: 1px solid var(--card-border); padding-top: 24px; }
.block-sources ul { padding-left: 20px; }
.block-sources li { margin-bottom: 12px; }

.block-image { margin: 28px 0; text-align: center; }
.block-image img { max-width: 100%; height: auto; border-radius: 4px; }
.block-image figcaption { font-size: 0.85rem; color: var(--muted); margin-top: 6px; }

.block-section-break { border: none; border-top: 1px solid var(--card-border); margin: 40px 0; }

.table-scroll { overflow-x: auto; margin: 24px 0; }
.table-scroll table { width: 100%; border-collapse: collapse; }
.table-scroll th, .table-scroll td { border: 1px solid var(--card-border); padding: 8px 12px; text-align: left; }
.table-scroll th { background: var(--stone); }

.glossary-link {
    color: var(--forest);
    border-bottom: 1px dotted var(--forest);
    text-decoration: none;
}

.reading-article a:focus-visible,
#readability-controls button:focus-visible,
.site-nav a:focus-visible {
    outline: 2px solid var(--copper);
    outline-offset: 2px;
}

@media (max-width: 640px) {
    .reading-article { padding: 24px 20px; }
}

/* Confidential assignment / exercise rendering */
.exercise-eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.8rem;
    color: var(--muted);
    margin: 0 0 4px;
    text-align: center;
}
.exercise-assignment > h1 {
    text-align: center;
    margin: 0 0 32px;
}
.exercise-round {
    border-top: 1px solid var(--card-border);
    padding-top: 24px;
    margin-top: 24px;
}
.exercise-round:first-of-type {
    border-top: none;
    padding-top: 0;
}
.round-heading {
    color: var(--copper);
    margin-bottom: 4px;
}
.matter-label {
    color: var(--muted);
    font-size: 0.9rem;
    margin-top: 0;
    margin-bottom: 16px;
}
.exercise-embedded-phase {
    background: var(--stone);
    border: 1px solid var(--card-border);
    border-radius: 4px;
    padding: 20px 24px;
    margin-top: 32px;
}
.exercise-embedded-phase .round-heading {
    margin-top: 0;
}

/* Floating badge for switching between student and admin views -
   only rendered at all when the visitor is actually logged in as
   admin, so an ordinary student never sees this. */
.view-toggle-badge {
    position: fixed;
    bottom: 16px;
    right: 16px;
    background: var(--navy);
    color: #fff;
    text-decoration: none;
    padding: 10px 18px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 1000;
}
.view-toggle-badge:hover {
    background: var(--forest);
}