/* ==========================================================================
   Course Player — public/css/course-player.css
   Variation C: collapsible left nav + practice companion panel.
   No hex literals — all colours via design-system tokens.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Archive / Overview pages (unchanged)
   -------------------------------------------------------------------------- */


.sbn-courses-grid,
.sbn-courses-carousel {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
@media (max-width: 900px)  { .sbn-courses-grid, .sbn-courses-carousel { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px)  { .sbn-courses-grid, .sbn-courses-carousel { grid-template-columns: 1fr; } }

/* .sbn-course-genre-section replaced by .sbn-lib-category-section in design system */

.sbn-course-show-hero {
    background: var(--clr-white); border: 1px solid var(--clr-border);
    border-radius: var(--radius); padding: 24px; margin-bottom: 20px;
}
.sbn-course-show-hero h1 { margin: 6px 0 8px; }
.sbn-course-show-cta { display: flex; gap: 10px; margin-top: 16px; }
.sbn-course-lesson-list {
    background: var(--clr-white); border: 1px solid var(--clr-border);
    border-radius: var(--radius); padding: 18px;
}
.sbn-course-lesson-list ol { margin: 0; padding-left: 20px; }
.sbn-course-lesson-list li { margin-bottom: 8px; color: var(--clr-text); }

/* --------------------------------------------------------------------------
   2. Player shell — 3-column grid
   -------------------------------------------------------------------------- */

.vC-grid {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr) 320px;
    gap: 20px;
    padding: 16px 0 40px;
    min-height: calc(100vh - var(--header-height, 96px));
    transition: grid-template-columns 0.25s ease;
}

.sbn-player-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}


.vC-grid.is-collapsed {
    grid-template-columns: 64px minmax(0, 1fr) 320px;
}

/* --------------------------------------------------------------------------
   3. Left nav — EXPANDED state
   -------------------------------------------------------------------------- */

.vC-nav {
    background: var(--clr-white);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: calc(var(--header-height, 96px) + 16px);
    max-height: calc(100vh - var(--header-height, 96px) - 32px);
    overflow: hidden;
    align-self: start;
}

.vC-nav-hero {
    padding: 14px 16px 12px;
    border-bottom: 1px solid var(--clr-border);
    flex-shrink: 0;
}

.vC-nav-hero-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.vC-nav-hero h3 {
    margin: 0 0 10px;
    font-size: 15px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--clr-text);
}

.vC-nav-collapse {
    width: 26px; height: 26px;
    border-radius: 999px;
    border: 1px solid var(--clr-border);
    background: var(--clr-white);
    cursor: pointer;
    color: var(--clr-text-muted);
    display: grid; place-items: center;
    flex-shrink: 0;
    transition: all 0.12s;
}
.vC-nav-collapse:hover { color: var(--clr-accent-dim); border-color: var(--clr-accent-border); }

.vC-nav-progress-bar {
    height: 5px;
    background: var(--clr-surface-3);
    border-radius: 999px;
    overflow: hidden;
}
.vC-nav-progress-bar span {
    display: block; height: 100%;
    background: var(--clr-gradient);
    border-radius: 999px;
    transition: width 0.3s ease;
}
.vC-nav-progress-text {
    display: block;
    margin-top: 5px;
    font-size: 11px;
    color: var(--clr-text-muted);
}

.vC-nav-list {
    overflow-y: auto;
    padding: 6px 0 12px;
    flex: 1;
    min-height: 0;
}

.vC-nav-section { padding: 6px 0; }

.vC-nav-label {
    font-size: 10.5px; font-weight: 700;
    letter-spacing: 0.08em; text-transform: uppercase;
    color: var(--clr-text-muted);
    padding: 6px 16px;
}

.vC-nav-item {
    display: grid;
    grid-template-columns: 24px 1fr;
    gap: 10px;
    align-items: center;
    width: 100%;
    padding: 8px 14px;
    text-align: left;
    font-size: 13px;
    color: var(--clr-text-dim);
    border-left: 2px solid transparent;
    text-decoration: none;
    transition: background 0.12s;
}
.vC-nav-item:hover { background: var(--clr-surface-2); color: var(--clr-text); }
.vC-nav-item.is-current {
    background: var(--clr-accent-bg);
    color: var(--clr-text);
    font-weight: 600;
    border-left-color: var(--clr-accent);
}

.vC-nav-num {
    display: grid; place-items: center;
    width: 22px; height: 22px;
    border-radius: 999px;
    background: var(--clr-white);
    border: 1.5px solid var(--clr-border);
    font-size: 11px; font-weight: 700;
    color: var(--clr-text-muted);
    flex-shrink: 0;
    transition: all 0.12s;
}
.vC-nav-item.is-current .vC-nav-num {
    background: var(--clr-gradient);
    color: var(--clr-white);
    border-color: transparent;
    box-shadow: 0 0 0 3px rgba(243, 156, 18, 0.18);
}


.vC-nav-title { line-height: 1.3; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }

.vC-nav-lock { font-size: 11px; opacity: 0.7; }

.vC-nav-preview {
    font-size: 10px; font-weight: 700; letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--clr-accent-dim);
    background: var(--clr-accent-bg);
    border: 1px solid var(--clr-accent-border);
    padding: 2px 6px; border-radius: 999px;
}

/* Subsection indented items */
.vC-nav-subs { padding: 0 0 4px 50px; }

.vC-nav-sub-btn {
    display: block; width: 100%;
    border: 0; background: transparent; cursor: pointer;
    text-align: left;
    font-size: 12.5px;
    color: var(--clr-text-muted);
    padding: 5px 8px;
    border-radius: var(--radius-sm);
    transition: color 0.12s, background 0.12s;
}
.vC-nav-sub-btn::before { content: '›'; margin-right: 6px; opacity: 0.5; }
.vC-nav-sub-btn:hover { color: var(--clr-text-dim); background: var(--clr-surface-2); }
.vC-nav-sub-btn.is-active { color: var(--clr-accent-dim); font-weight: 600; background: var(--clr-accent-bg); }

/* --------------------------------------------------------------------------
   4. Left nav — COLLAPSED rail (B-style)
   -------------------------------------------------------------------------- */

.vC-rail {
    position: sticky;
    top: calc(var(--header-height, 96px) + 16px);
    align-self: start;
    background: var(--clr-white);
    border: 1px solid var(--clr-border);
    border-radius: 999px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 12px 0;
    width: 56px;
    margin: 0 auto;
}

.vC-rail-toggle {
    width: 32px; height: 32px;
    border-radius: 999px;
    border: 1px solid var(--clr-border);
    background: var(--clr-white);
    cursor: pointer;
    color: var(--clr-text-muted);
    display: grid; place-items: center;
    transition: all 0.12s;
}
.vC-rail-toggle:hover { color: var(--clr-accent-dim); border-color: var(--clr-accent-border); }

.vC-rail-progress { padding: 2px 0; }
.vC-rail-divider { width: 24px; height: 1px; background: var(--clr-border); }
.vC-rail-lessons {
    list-style: none; padding: 0; margin: 0;
    display: grid; gap: 6px;
}

.vC-rail-node {
    display: grid; place-items: center;
    width: 32px; height: 32px;
    border-radius: 999px;
    border: 1.5px solid var(--clr-border-strong);
    background: var(--clr-white);
    font-size: 12px; font-weight: 700;
    color: var(--clr-text-muted);
    text-decoration: none;
    transition: all 0.12s;
    padding: 0;
    cursor: pointer;
}
.is-current .vC-rail-node {
    background: var(--clr-gradient);
    border-color: transparent;
    color: var(--clr-white);
    box-shadow: 0 0 0 4px rgba(243, 156, 18, 0.18);
}
.is-upcoming .vC-rail-node:hover { border-color: var(--clr-accent-border); color: var(--clr-accent-dim); }


/* --------------------------------------------------------------------------
   5. Middle content column
   -------------------------------------------------------------------------- */

.vC-content-wrap {
    background: var(--clr-white);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    padding: 28px 36px 24px;
    min-height: 720px;
    display: flex;
    flex-direction: column;
}

.vC-head {
    padding-bottom: 12px;
    border-bottom: 1px solid var(--clr-border);
    margin-bottom: 16px;
    flex-shrink: 0;
}

.vC-head-eyebrow {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--clr-text-muted);
    font-weight: 600;
    margin-bottom: 6px;
}

.vC-mobile-menu-btn {
    display: none;
    width: 28px; height: 28px;
    border: 1px solid var(--clr-border);
    background: var(--clr-white);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--clr-text-muted);
    place-items: center;
}

.vC-title {
    font-size: 28px; font-weight: 700;
    margin: 0 0 10px;
    letter-spacing: -0.015em;
    color: var(--clr-text);
    line-height: 1.2;
}

.vC-head-tabs { display: flex; gap: 6px; flex-wrap: wrap; }

.vC-tab {
    border: 0;
    background: var(--clr-surface-3);
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 12.5px; font-weight: 600;
    color: var(--clr-text-dim);
    cursor: pointer;
    transition: all 0.12s;
}
.vC-tab:hover { background: var(--clr-accent-bg); color: var(--clr-accent-dim); border-color: var(--clr-accent-border); transform: translateY(-1px); }
.vC-tab.is-active { background: var(--clr-gradient); color: var(--clr-white); }

.vC-prose { flex: 1; }

/* Edu widget embedded in lesson body — matches theory-card presentation */
.vC-prose sbn-widget.sbn-widget-embed {
    display: block;
    margin: 1.5rem 0;
    border: 1px solid var(--clr-border);
    border-radius: 0.875rem;
    overflow: hidden;
    max-width: 480px;
}

/* Subsection chunk visibility — controlled via JS */
.sbn-subsection-chunk { display: none; }
.sbn-subsection-chunk.is-active { display: block; }

/* Lesson HTML content styles */
.vC-lesson-html { color: var(--clr-text); font-size: 16px; line-height: 1.65; }
.vC-lesson-html p { margin: 0 0 16px; }
.vC-lesson-html h2 { font-size: 22px; font-weight: 700; margin: 12px 0 12px; color: var(--clr-text); letter-spacing: -0.01em; }
.vC-lesson-html h3 { font-size: 17px; font-weight: 700; margin: 24px 0 10px; color: var(--clr-text); }
.vC-lesson-html strong { font-weight: 600; color: var(--clr-text); }
.vC-lesson-html em { font-style: italic; color: var(--clr-accent-dim); }
.vC-lesson-html ul { padding-left: 22px; margin: 0 0 18px; }
.vC-lesson-html ul li { margin-bottom: 8px; }

/* --------------------------------------------------------------------------
   Rhythm Embed — layout only (frame styles live in sbn-design-system.css)
   -------------------------------------------------------------------------- */
.sbn-rhythm-embed-wrap {
    margin: 32px auto;
    max-width: 640px;
}

/* --------------------------------------------------------------------------
   Chord Embed — layout only (card styles live in sbn-design-system.css)
   -------------------------------------------------------------------------- */
.sbn-chord-embed {
    display: inline-block;
    vertical-align: top;
    width: 140px;
    margin: 10px 14px 10px 0;
}

.sbn-chord-embed .sbn-chord-card {
    width: 100%;
    max-width: 140px;
}

.sbn-pattern-row-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.sbn-pattern-row-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--clr-text);
}

.sbn-pattern-row-badges {
    display: flex;
    gap: 6px;
}


/* Locked lesson CTA */
.vC-lock-cta {
    display: flex; flex-direction: column; align-items: center;
    text-align: center;
    padding: 60px 32px;
    gap: 12px;
    color: var(--clr-text-dim);
}
.vC-lock-icon { font-size: 40px; }
.vC-lock-cta h3 { margin: 0; font-size: 20px; color: var(--clr-text); }
.vC-lock-cta p { margin: 0; color: var(--clr-text-muted); }

.vC-empty { color: var(--clr-text-muted); font-style: italic; padding: 32px; text-align: center; }

.vC-foot {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding-top: 22px;
    margin-top: 16px;
    border-top: 1px solid var(--clr-border);
    flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   6. Right — Practice companion panel
   -------------------------------------------------------------------------- */

.vC-practice {
    position: sticky;
    top: calc(var(--header-height, 96px) + 16px);
    align-self: start;
    background: linear-gradient(180deg, var(--clr-accent-bg) 0%, var(--clr-white) 60%);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    /* No outer padding — sections run edge to edge so media (the video) can
       be full-bleed. Section content is re-inset by .vC-card; the head and
       transport carry their own gutter. */
    padding: 0;
    display: flex;
    flex-direction: column;
    /* Sections butt against each other; .vC-card draws a divider between. */
    gap: 0;
    max-height: calc(100vh - var(--header-height, 96px) - 32px);
    overflow-y: auto;
}

/* Horizontal gutter for the edge elements that aren't .vC-card sections. */
.vC-practice-head {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 11px; font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--clr-accent-dim);
    padding: 16px 16px 12px;
}

.vC-practice-dot {
    width: 7px; height: 7px;
    border-radius: 999px;
    background: var(--clr-success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18);
    flex-shrink: 0;
}

/* Shared section. Once boxed cards; now flat stacked sections separated by a
   hairline divider. Horizontal padding keeps content off the sidebar edge —
   only media (the video card) opts out of that inset. */
.vC-card {
    padding: 14px 16px;
    border-top: 1px solid var(--clr-border);
}
/* First section needs no divider — the head sits above it. */
.vC-practice-head + .vC-card {
    border-top: 0;
}

.vC-hero-chord-link,
.vC-practice .sbn-chord-card--mini {
    display: block;
    text-decoration: none;
    color: inherit;
    border-radius: var(--radius-sm);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    max-width: 160px;
    margin: 0 auto;
    width: 100%;
}
.vC-hero-chord-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.vC-card-eyebrow {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px; font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--clr-text-muted);
    margin-bottom: 10px;
}

.vC-card-meta {
    font-weight: 600;
    color: var(--clr-text-muted);
    letter-spacing: 0;
    text-transform: none;
    font-size: 12px;
}

.vC-card-cta {
    width: 100%;
    margin-top: 8px;
    justify-content: center;
}

/* Chord grid */
.vC-chord-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(64px, 1fr));
    gap: 6px;
}

.vC-chord-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    border: 0;
    background: transparent;
    cursor: pointer;
    padding: 6px 4px;
    border-radius: var(--radius-sm);
    transition: background 0.12s;
}
.vC-chord-cell:hover { background: var(--clr-surface-2); }

.vC-chord-cell-diagram { width: 44px; }
.vC-chord-canvas { display: block; width: 44px; height: 56px; }

.vC-chord-cell-name {
    font-family: var(--font-chord);
    font-size: 15px;
    line-height: 1.1;
    color: var(--clr-text);
    text-align: center;
}

/* Cinema link (below exercise video) */
.vC-video-cinema-link {
    display: block;
    margin-top: 8px;
    font-size: 11.5px;
    color: var(--clr-text-muted);
    text-decoration: none;
    text-align: right;
    padding: 0 2px;
}
.vC-video-cinema-link:hover { color: var(--clr-accent); }

/* Rhythm selector */
.vC-rhythm-row {
    display: flex; gap: 4px; margin-top: 10px; flex-wrap: wrap;
}
.vC-rhythm-pill {
    border: 1px solid var(--clr-border);
    background: var(--clr-white);
    padding: 4px 10px; border-radius: 999px;
    font-size: 11.5px; cursor: pointer;
    color: var(--clr-text-dim);
    transition: all 0.12s;
}
.vC-rhythm-pill.is-active {
    background: var(--clr-text-muted);
    color: var(--clr-white);
    border-color: var(--clr-text-muted);
}

/* Transport */
.vC-transport {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 10px;
    align-items: center;
    background: var(--clr-white);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    padding: 12px;
    /* Sidebar has no outer padding now — inset the transport so the boxed
       action bar doesn't touch the edges. */
    margin: 14px 16px 16px;
}

.vC-play {
    width: 56px; height: 56px;
    border-radius: 999px;
    background: var(--clr-gradient);
    border: 0; cursor: pointer;
    display: grid; place-items: center;
    box-shadow: var(--shadow);
    transition: transform 0.15s;
    grid-row: span 2;
}
.vC-play:hover { transform: scale(1.05); }

.vC-bpm {
    display: flex; align-items: center; justify-content: space-between;
    gap: 6px;
}

.vC-bpm-step {
    width: 28px; height: 28px; border-radius: 999px;
    border: 1px solid var(--clr-border);
    background: var(--clr-white); cursor: pointer;
    font-size: 16px; line-height: 1; color: var(--clr-text-dim);
    display: grid; place-items: center;
    transition: all 0.12s;
}
.vC-bpm-step:hover { border-color: var(--clr-accent-border); color: var(--clr-accent-dim); }

.vC-bpm-val { display: flex; align-items: baseline; gap: 4px; }
.vC-bpm-num { font-family: var(--font-chord, serif); font-size: 26px; font-weight: 600; color: var(--clr-text); line-height: 1; }
.vC-bpm-lbl { font-size: 11px; color: var(--clr-text-muted); }

.vC-bpm-presets { display: flex; gap: 4px; grid-column: 2; }
.vC-bpm-preset {
    flex: 1;
    border: 1px solid var(--clr-border);
    background: var(--clr-white);
    padding: 4px;
    border-radius: var(--radius-sm);
    font-size: 11px; cursor: pointer;
    color: var(--clr-text-dim);
    transition: all 0.12s;
}
.vC-bpm-preset.is-active {
    background: var(--clr-accent-bg);
    color: var(--clr-accent-dim);
    border-color: var(--clr-accent-border);
    font-weight: 700;
}

/* --------------------------------------------------------------------------
   7. Shared sbn-btn overrides (player context)
   -------------------------------------------------------------------------- */

.vC-foot .sbn-btn { min-width: 120px; justify-content: center; }

/* --------------------------------------------------------------------------
   8. Mobile
   -------------------------------------------------------------------------- */

.vC-mobile-overlay {
    display: none;
}

@media (max-width: 900px) {
    .vC-grid {
        grid-template-columns: 1fr !important;
        grid-template-rows: auto;
        padding: 12px 16px 40px;
        gap: 0;
    }

    .vC-grid.mobile-sidebar-open .vC-nav {
        position: fixed;
        top: 0; left: 0; bottom: 0;
        width: 280px;
        z-index: 200;
        border-radius: 0;
        max-height: 100vh;
    }

    .vC-grid.mobile-sidebar-open .vC-mobile-overlay {
        display: block;
        position: fixed; inset: 0;
        background: rgba(0,0,0,0.35);
        z-index: 199;
        border: 0;
        cursor: pointer;
    }

    /* Rail hidden on mobile; the mobile-menu-btn inside content header replaces it */
    .vC-rail { display: none; }

    .vC-mobile-menu-btn { display: grid; }

    .vC-content-wrap {
        padding: 20px 18px;
        min-height: auto;
        border-radius: var(--radius) var(--radius) 0 0;
    }

    .vC-practice {
        position: static;
        max-height: none;
        border-radius: 0 0 var(--radius) var(--radius);
        border-top: 0;
    }
}