/* Module narration player — /learn/* curriculum pages */
.learn-audio {
    margin: var(--space-6) auto 0;
    max-width: var(--container-max, 72rem);
    padding: 0 var(--space-5);
}

.learn-audio--in-header {
    margin: var(--space-6) 0 0;
    padding: 0;
    max-width: none;
}

.learn-audio__shell {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-5);
    background: linear-gradient(135deg, rgba(255, 106, 44, 0.12), var(--ink-3) 55%);
    border: 1px solid rgba(255, 106, 44, 0.35);
    border-radius: var(--r-lg);
    box-shadow: 0 12px 40px -24px rgba(0, 0, 0, 0.65);
}

/* Controls cluster — skip-back / play / skip-forward in an audiobook-style row */
.learn-audio__controls {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.learn-audio__skip {
    flex-shrink: 0;
    min-width: 56px;
    height: 40px;
    padding: 0 var(--space-3);
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.16);
    background: rgba(255, 255, 255, 0.04);
    color: var(--bone);
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: background 160ms ease, transform 160ms ease, border-color 160ms ease;
}

.learn-audio__skip:hover {
    background: rgba(255, 106, 44, 0.16);
    border-color: rgba(255, 106, 44, 0.45);
    transform: translateY(-1px);
}

.learn-audio__skip:focus-visible {
    outline: 2px solid var(--bone);
    outline-offset: 3px;
}

.learn-audio__skip:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
}

.learn-audio__play {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    border: none;
    border-radius: 50%;
    background: var(--edge);
    color: var(--ink);
    cursor: pointer;
    display: grid;
    place-items: center;
    font-size: 1.1rem;
    transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.learn-audio__play:hover {
    transform: scale(1.04);
    box-shadow: 0 0 0 6px rgba(255, 106, 44, 0.2);
}

.learn-audio__play:focus-visible {
    outline: 2px solid var(--bone);
    outline-offset: 3px;
}

.learn-audio__play-icon--pause {
    display: none;
    letter-spacing: -0.2em;
    font-size: 0.85rem;
}

.learn-audio--playing .learn-audio__play-icon--play {
    display: none;
}

.learn-audio--playing .learn-audio__play-icon--pause {
    display: block;
}

/* Loading state — pulse the play button until the MP3 is ready */
.learn-audio--loading .learn-audio__play {
    background: rgba(255, 106, 44, 0.65);
    animation: learn-audio-pulse 1.2s ease-in-out infinite;
}

.learn-audio--loading .learn-audio__play-icon--play,
.learn-audio--loading .learn-audio__play-icon--pause {
    opacity: 0.5;
}

@keyframes learn-audio-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(255, 106, 44, 0.45); }
    50%      { box-shadow: 0 0 0 10px rgba(255, 106, 44, 0); }
}

@media (prefers-reduced-motion: reduce) {
    .learn-audio--loading .learn-audio__play {
        animation: none;
    }
}

.learn-audio__main {
    flex: 1;
    min-width: 0;
}

.learn-audio__label {
    margin: 0 0 var(--space-2);
    font-family: var(--font-mono);
    font-size: var(--t-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--edge);
}

.learn-audio__track {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.learn-audio__scrub {
    width: 100%;
    height: 6px;
    accent-color: var(--edge);
    cursor: pointer;
}

.learn-audio__times {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: var(--t-xs);
    color: var(--bone-3);
}

.learn-audio__mode {
    margin: var(--space-2) 0 0;
    font-size: var(--t-xs);
    color: var(--bone-3);
    line-height: 1.45;
}

/* Narrative tracker — "Now reading" caption */
.learn-audio__now {
    margin: var(--space-3) 0 0;
    padding: var(--space-3) var(--space-3);
    background: rgba(255, 106, 44, 0.06);
    border: 1px dashed rgba(255, 106, 44, 0.28);
    border-radius: var(--r-sm);
    font-size: var(--t-xs);
    line-height: 1.5;
    color: var(--bone-2);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.learn-audio__now[data-state="idle"] {
    opacity: 0.6;
}

.learn-audio__now-kicker {
    font-family: var(--font-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--edge);
}

.learn-audio__now-text {
    color: var(--bone);
}

.learn-audio__follow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: var(--space-2) 0 0;
    font-family: var(--font-mono);
    font-size: var(--t-xs);
    color: var(--bone-3);
    cursor: pointer;
}

.learn-audio__follow-toggle {
    accent-color: var(--edge);
    cursor: pointer;
}

/* Per-paragraph highlight in the article body driven by JS */
.learn-audio-current {
    background-color: rgba(255, 184, 77, 0.12);
    box-shadow: -4px 0 0 rgba(255, 184, 77, 0.55);
    border-radius: 2px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

@media (prefers-reduced-motion: reduce) {
    .learn-audio-current {
        transition: none;
    }
}

/* Resume-from-position banner — only visible when there is saved progress */
.learn-audio__resume[hidden] {
    display: none !important;
}

.learn-audio__resume {
    margin: var(--space-3) 0 0;
    padding: var(--space-3) var(--space-3);
    background: rgba(255, 184, 77, 0.10);
    border: 1px solid rgba(255, 184, 77, 0.35);
    border-radius: var(--r-sm);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    font-size: var(--t-xs);
    color: var(--bone);
}

.learn-audio__resume-text {
    flex: 1;
    min-width: 12ch;
}

.learn-audio__resume-actions {
    display: inline-flex;
    gap: var(--space-2);
}

.learn-audio__resume-btn {
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.04);
    color: var(--bone);
    font-family: var(--font-mono);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 8px 12px;
    border-radius: 999px;
    cursor: pointer;
    transition: background 160ms ease, border-color 160ms ease;
}

.learn-audio__resume-btn:hover {
    background: rgba(255, 106, 44, 0.18);
    border-color: rgba(255, 106, 44, 0.5);
}

.learn-audio__resume-btn--resume {
    background: var(--edge);
    color: var(--ink);
    border-color: transparent;
}

.learn-audio__resume-btn--resume:hover {
    background: var(--edge);
    filter: brightness(1.08);
    border-color: transparent;
}

/* Meta area beneath the player — module navigator + sections list */
.learn-audio__meta {
    margin: var(--space-3) 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    align-items: center;
}

.learn-audio__module-nav {
    flex: 1 1 16rem;
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--bone-3);
}

.learn-audio__module-nav-select {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    text-transform: none;
    letter-spacing: 0;
    padding: 10px 12px;
    border-radius: var(--r-sm);
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: var(--ink-4);
    color: var(--bone);
    cursor: pointer;
    width: 100%;
}

.learn-audio__module-nav-select:focus-visible {
    outline: 2px solid var(--edge);
    outline-offset: 2px;
}

.learn-audio__sections {
    flex: 1 1 16rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: var(--r-sm);
    padding: 0;
}

.learn-audio__sections summary {
    list-style: none;
    cursor: pointer;
    padding: 10px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    font-family: var(--font-mono);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--bone-2);
}

.learn-audio__sections summary::-webkit-details-marker { display: none; }

.learn-audio__sections summary::after {
    content: "▾";
    color: var(--edge);
    font-size: 10px;
    transition: transform 160ms ease;
}

.learn-audio__sections[open] summary::after { transform: rotate(180deg); }

.learn-audio__sections-count {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--edge);
    background: rgba(255, 106, 44, 0.12);
    border-radius: 999px;
    padding: 2px 8px;
    letter-spacing: 0.06em;
}

.learn-audio__sections-list {
    margin: 0;
    padding: 0 var(--space-4) var(--space-3) calc(var(--space-4) + 1.2em);
    color: var(--bone-2);
    font-size: 0.95rem;
    line-height: 1.5;
}

.learn-audio__sections-link {
    color: var(--bone-2);
    text-decoration: none;
    border-bottom: 1px solid transparent;
}

.learn-audio__sections-link:hover {
    color: var(--edge);
    border-bottom-color: rgba(255, 106, 44, 0.45);
}

@media (max-width: 640px) {
    .learn-audio__controls {
        order: 2;
        width: 100%;
        justify-content: space-between;
        gap: var(--space-2);
    }

    .learn-audio__main { order: 1; flex: 1 1 100%; }

    .learn-audio__speed-wrap { order: 3; }

    .learn-audio__skip {
        flex: 1;
        min-width: 0;
        font-size: 11px;
    }

    .learn-audio__meta { flex-direction: column; align-items: stretch; }
}

/* ---------------------------------------------------------------
   Curriculum prev/next navigation appended to lesson pages
   --------------------------------------------------------------- */
.lesson-nav {
    margin: var(--space-9) auto 0;
    max-width: var(--container-max, 72rem);
    padding: var(--space-6) var(--space-5);
    background: linear-gradient(135deg, rgba(255, 106, 44, 0.10), rgba(255, 255, 255, 0.02));
    border: 1px solid rgba(255, 106, 44, 0.32);
    border-radius: var(--r-lg);
}

.lesson-nav__eyebrow {
    margin: 0 0 var(--space-3);
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--edge);
}

.lesson-nav__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.lesson-nav__link {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: var(--space-4) var(--space-5);
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: var(--r-md, 10px);
    color: var(--bone);
    text-decoration: none;
    transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.lesson-nav__link:hover,
.lesson-nav__link:focus-visible {
    transform: translateY(-2px);
    border-color: rgba(255, 106, 44, 0.55);
    background: rgba(255, 106, 44, 0.08);
    outline: none;
}

.lesson-nav__link--prev { text-align: left; }
.lesson-nav__link--next { text-align: right; }

.lesson-nav__direction {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--edge);
}

.lesson-nav__module {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    color: var(--bone);
    line-height: 1.3;
}

.lesson-nav__tier {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--bone-3);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.lesson-nav__hint {
    margin: var(--space-4) 0 0;
    font-size: var(--t-xs);
    color: var(--bone-3);
    line-height: 1.55;
}

.lesson-nav__hint a {
    color: var(--edge);
    text-decoration: underline;
    text-underline-offset: 3px;
}

@media (max-width: 640px) {
    .lesson-nav {
        margin: var(--space-7) auto 0;
        padding: var(--space-5);
    }
    .lesson-nav__row {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
    .lesson-nav__link--next {
        text-align: left;
    }
}

.learn-audio__speed-wrap {
    flex-shrink: 0;
}

.learn-audio__speed {
    font-family: var(--font-mono);
    font-size: var(--t-xs);
    padding: 6px 8px;
    border-radius: var(--r-sm);
    border: 1px solid var(--line-2);
    background: var(--ink-4);
    color: var(--bone);
    cursor: pointer;
}

.learn-audio__element {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 640px) {
    .learn-audio__shell {
        flex-wrap: wrap;
    }

    .learn-audio__speed-wrap {
        width: 100%;
    }

    .learn-audio__speed {
        width: 100%;
    }
}