:where([data-lesson-narration], [data-narration-player], [data-narration-root]) {
    --narration-surface: #14211e;
    --narration-surface-soft: #20312d;
    --narration-accent: #d9ff57;
    --narration-warm: #ff6a3d;
    --narration-paper: #fffef9;
    --narration-muted: rgba(255, 254, 249, .7);
    position: relative;
    isolation: isolate;
    max-width: 900px;
    margin-top: 32px;
    overflow: hidden;
    border: 1px solid rgba(20, 33, 30, .26);
    border-radius: 24px;
    background:
        radial-gradient(circle at 92% -20%, rgba(217, 255, 87, .25), transparent 42%),
        var(--narration-surface);
    box-shadow: 0 22px 65px rgba(20, 33, 30, .15);
    color: var(--narration-paper);
}

.lesson-narration {
    display: grid;
    grid-template-columns: minmax(210px, .72fr) minmax(390px, 1.28fr);
    gap: 12px clamp(24px, 4vw, 52px);
    align-items: center;
    padding: clamp(22px, 4vw, 36px);
}

:where([data-lesson-narration], [data-narration-player], [data-narration-root])::before {
    position: absolute;
    top: -55px;
    right: -40px;
    z-index: -1;
    width: 170px;
    height: 170px;
    border: 1px solid rgba(255, 254, 249, .12);
    border-radius: 50%;
    content: "";
}

.lesson-narration__body,
[data-narration-body] {
    display: grid;
    grid-template-columns: minmax(220px, .72fr) minmax(360px, 1.28fr);
    gap: clamp(24px, 5vw, 58px);
    align-items: center;
    padding: clamp(22px, 4vw, 36px);
}

.lesson-narration__intro,
[data-narration-intro] {
    min-width: 0;
}

.lesson-narration > .lesson-narration__intro {
    grid-row: 1 / span 4;
    grid-column: 1;
}

.lesson-narration__intro {
    display: grid;
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 15px;
    align-items: start;
}

.lesson-narration__icon {
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border: 1px solid rgba(20, 33, 30, .18);
    border-radius: 50%;
    background: var(--narration-accent);
    color: var(--narration-surface);
    font-size: 25px;
    font-weight: 850;
    line-height: 1;
    transform: rotate(-13deg);
}

.lesson-narration__intro .section-kicker {
    margin: 1px 0 8px;
    color: var(--narration-accent);
}

.lesson-narration__intro h2 {
    margin: 0;
    color: var(--narration-paper);
    font-size: clamp(22px, 3vw, 31px);
    font-weight: 780;
    line-height: 1.04;
    letter-spacing: -.045em;
}

.lesson-narration__intro h2 + p {
    margin: 10px 0 0;
    color: var(--narration-muted);
    font-size: 11px;
    line-height: 1.55;
}

.lesson-narration__kicker,
[data-narration-kicker] {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 10px;
    color: var(--narration-accent);
    font: 800 10px/1.3 var(--mono, monospace);
    letter-spacing: .12em;
}

.lesson-narration__kicker::before,
[data-narration-kicker]::before {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: currentColor;
    box-shadow: 0 0 0 5px rgba(217, 255, 87, .1);
    content: "";
}

.lesson-narration__title,
[data-narration-title] {
    margin: 0;
    color: var(--narration-paper);
    font-size: clamp(22px, 3vw, 31px);
    font-weight: 780;
    line-height: 1.04;
    letter-spacing: -.045em;
}

.lesson-narration__description,
[data-narration-description] {
    max-width: 42ch;
    margin: 11px 0 0;
    color: var(--narration-muted);
    font-size: 12px;
    line-height: 1.55;
}

.lesson-narration__engine,
[data-narration-engine] {
    display: inline-flex;
    align-items: center;
    min-height: 25px;
    margin-top: 15px;
    padding: 5px 9px;
    border: 1px solid rgba(255, 254, 249, .13);
    border-radius: 999px;
    color: rgba(255, 254, 249, .62);
    font: 700 9px/1.2 var(--mono, monospace);
    letter-spacing: .04em;
}

.lesson-narration__panel,
[data-narration-panel] {
    min-width: 0;
    padding: 16px;
    border: 1px solid rgba(255, 254, 249, .12);
    border-radius: 18px;
    background: rgba(255, 254, 249, .055);
    backdrop-filter: blur(8px);
}

.lesson-narration__now,
[data-narration-current] {
    display: block;
    min-height: 18px;
    margin-bottom: 11px;
    overflow: hidden;
    color: var(--narration-paper);
    font-size: 11px;
    font-weight: 730;
    line-height: 1.45;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.lesson-narration__progress-row,
[data-narration-progress-row] {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    align-items: center;
    margin-bottom: 15px;
}

[data-narration-progress] {
    width: 100%;
    height: 6px;
    overflow: hidden;
    border: 0;
    border-radius: 999px;
    background: rgba(255, 254, 249, .13);
    color: var(--narration-accent);
    appearance: none;
}

progress[data-narration-progress]::-webkit-progress-bar {
    border-radius: 999px;
    background: rgba(255, 254, 249, .13);
}

progress[data-narration-progress]::-webkit-progress-value {
    border-radius: 999px;
    background: linear-gradient(90deg, var(--narration-accent), #f4ffbd);
}

progress[data-narration-progress]::-moz-progress-bar {
    border-radius: 999px;
    background: linear-gradient(90deg, var(--narration-accent), #f4ffbd);
}

div[data-narration-progress]::after {
    display: block;
    width: var(--narration-progress, 0%);
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--narration-accent), #f4ffbd);
    content: "";
    transition: width 180ms ease;
}

[data-narration-progress-text] {
    color: var(--narration-muted);
    font: 700 9px/1.2 var(--mono, monospace);
    white-space: nowrap;
}

.lesson-narration__controls,
[data-narration-controls] {
    display: grid;
    grid-template-columns: minmax(138px, 1fr) repeat(3, auto) auto;
    gap: 8px;
    align-items: center;
}

.lesson-narration > .lesson-narration__controls {
    grid-row: 1;
    grid-column: 2;
    padding: 14px;
    border: 1px solid rgba(255, 254, 249, .12);
    border-radius: 18px;
    background: rgba(255, 254, 249, .055);
    backdrop-filter: blur(8px);
}

.lesson-narration__progress {
    display: grid;
    grid-row: 2;
    grid-column: 2;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    align-items: center;
    padding-inline: 4px;
}

.lesson-narration > .lesson-narration__current {
    grid-row: 3;
    grid-column: 2;
}

.lesson-narration > .lesson-narration__status {
    grid-row: 4;
    grid-column: 2;
}

.lesson-narration > .lesson-narration__unavailable {
    grid-row: 5;
    grid-column: 2;
}

.lesson-narration__current {
    min-height: 18px;
    margin: 1px 4px 0;
    overflow: hidden;
    color: var(--narration-paper);
    font-size: 11px;
    font-weight: 730;
    line-height: 1.45;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.lesson-narration__status {
    min-height: 16px;
    margin: -7px 4px 0 !important;
}

[data-narration-toggle],
[data-narration-play],
[data-narration-stop],
[data-narration-previous],
[data-narration-prev],
[data-narration-next] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 46px;
    min-height: 46px;
    margin: 0;
    border: 1px solid rgba(255, 254, 249, .2);
    border-radius: 999px;
    background: rgba(255, 254, 249, .07);
    color: var(--narration-paper);
    font-size: 12px;
    font-weight: 760;
    line-height: 1;
    cursor: pointer;
    transition: border-color 160ms ease, background 160ms ease, color 160ms ease, transform 160ms ease;
}

[data-narration-toggle],
[data-narration-play] {
    gap: 9px;
    justify-content: flex-start;
    min-width: 0;
    padding: 0 17px;
    border-color: var(--narration-accent);
    background: var(--narration-accent);
    color: var(--narration-surface);
}

[data-narration-toggle]::before,
[data-narration-play]::before {
    display: grid;
    flex: 0 0 auto;
    place-items: center;
    width: 24px;
    height: 24px;
    border: 1px solid rgba(20, 33, 30, .22);
    border-radius: 50%;
    content: "▶";
    font-size: 9px;
    text-indent: 1px;
}

[data-state="playing"] [data-narration-toggle]::before,
[data-state="playing"] [data-narration-play]::before {
    content: "Ⅱ";
    font-size: 10px;
    text-indent: 0;
}

[data-state="paused"] [data-narration-toggle]::before,
[data-state="paused"] [data-narration-play]::before,
[data-state="completed"] [data-narration-toggle]::before,
[data-state="completed"] [data-narration-play]::before {
    content: "▶";
}

[data-narration-toggle]:hover:not(:disabled),
[data-narration-play]:hover:not(:disabled),
[data-narration-stop]:hover:not(:disabled),
[data-narration-previous]:hover:not(:disabled),
[data-narration-prev]:hover:not(:disabled),
[data-narration-next]:hover:not(:disabled) {
    transform: translateY(-2px);
}

[data-narration-stop]:hover:not(:disabled),
[data-narration-previous]:hover:not(:disabled),
[data-narration-prev]:hover:not(:disabled),
[data-narration-next]:hover:not(:disabled) {
    border-color: rgba(255, 254, 249, .42);
    background: rgba(255, 254, 249, .13);
}

[data-narration-toggle]:disabled,
[data-narration-play]:disabled,
[data-narration-stop]:disabled,
[data-narration-previous]:disabled,
[data-narration-prev]:disabled,
[data-narration-next]:disabled,
[data-narration-rate]:disabled {
    opacity: .42;
    cursor: not-allowed;
    transform: none;
}

.lesson-narration__rate,
[data-narration-rate-field] {
    display: grid;
    gap: 4px;
    justify-items: start;
    margin-left: 3px;
}

.lesson-narration__rate label,
[data-narration-rate-field] label {
    color: var(--narration-muted);
    font: 700 8px/1.1 var(--mono, monospace);
    letter-spacing: .08em;
}

[data-narration-rate] {
    min-width: 72px;
    min-height: 32px;
    padding: 0 25px 0 9px;
    border: 1px solid rgba(255, 254, 249, .2);
    border-radius: 9px;
    background: var(--narration-surface-soft);
    color: var(--narration-paper);
    font-size: 11px;
    font-weight: 750;
    cursor: pointer;
}

[data-narration-status] {
    min-height: 17px;
    margin: 12px 0 0;
    color: var(--narration-muted);
    font-size: 10px;
    line-height: 1.5;
}

[data-narration-unavailable] {
    margin: 0;
    padding: 16px;
    border: 1px solid rgba(255, 106, 61, .38);
    border-radius: 14px;
    background: rgba(255, 106, 61, .08);
    color: var(--narration-paper);
    font-size: 12px;
    line-height: 1.55;
}

:where([data-lesson-narration], [data-narration-player], [data-narration-root])[data-state="playing"] {
    border-color: rgba(217, 255, 87, .48);
    box-shadow: 0 24px 75px rgba(20, 33, 30, .22), 0 0 0 3px rgba(217, 255, 87, .08);
}

:where([data-lesson-narration], [data-narration-player], [data-narration-root])[data-state="paused"] {
    border-color: rgba(255, 106, 61, .42);
}

:where([data-lesson-narration], [data-narration-player], [data-narration-root])[data-state="error"] [data-narration-unavailable] {
    margin-top: 12px;
}

.guide-section.is-narration-active,
.guide-lede.is-narration-active,
[data-narration-active="true"] {
    scroll-margin-top: 24px;
    box-shadow: inset 4px 0 0 var(--orange, #ff6a3d);
}

@media (min-width: 981px) {
    :where([data-lesson-narration], [data-narration-player], [data-narration-root])[data-narration-sticky="true"][data-state="playing"],
    :where([data-lesson-narration], [data-narration-player], [data-narration-root])[data-narration-sticky="true"][data-state="paused"] {
        position: sticky;
        top: 12px;
        z-index: 18;
    }
}

@media (max-width: 760px) {
    :where([data-lesson-narration], [data-narration-player], [data-narration-root]) {
        width: 100%;
        margin-top: 26px;
        border-radius: 20px;
    }

    .lesson-narration {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 22px;
    }

    .lesson-narration > .lesson-narration__intro,
    .lesson-narration > .lesson-narration__controls,
    .lesson-narration > .lesson-narration__progress,
    .lesson-narration > .lesson-narration__current,
    .lesson-narration > .lesson-narration__status,
    .lesson-narration > .lesson-narration__unavailable {
        grid-row: auto;
        grid-column: 1;
    }

    .lesson-narration__intro {
        grid-template-columns: 44px minmax(0, 1fr);
        gap: 13px;
    }

    .lesson-narration__icon {
        width: 44px;
        height: 44px;
        font-size: 22px;
    }

    .lesson-narration__body,
    [data-narration-body] {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 22px;
    }

    .lesson-narration__description,
    [data-narration-description] {
        max-width: none;
    }

    .lesson-narration__panel,
    [data-narration-panel] {
        padding: 14px;
    }
}

@media (max-width: 520px) {
    .lesson-narration__body,
    [data-narration-body] {
        padding: 18px;
    }

    .lesson-narration {
        padding: 18px;
    }

    .lesson-narration__controls,
    [data-narration-controls] {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    [data-narration-toggle],
    [data-narration-play] {
        grid-column: 1 / -1;
        justify-content: center;
        min-height: 50px;
    }

    .lesson-narration__rate,
    [data-narration-rate-field] {
        grid-column: 1 / -1;
        grid-template-columns: auto minmax(0, 1fr);
        gap: 10px;
        align-items: center;
        margin: 4px 0 0;
    }

    [data-narration-rate] {
        width: 100%;
        min-height: 44px;
    }

    .lesson-narration__now,
    [data-narration-current] {
        white-space: normal;
    }
}

@media (prefers-reduced-motion: reduce) {
    [data-narration-progress]::after,
    [data-narration-toggle],
    [data-narration-play],
    [data-narration-stop],
    [data-narration-previous],
    [data-narration-prev],
    [data-narration-next] {
        transition: none !important;
    }

    [data-narration-toggle]:hover:not(:disabled),
    [data-narration-play]:hover:not(:disabled),
    [data-narration-stop]:hover:not(:disabled),
    [data-narration-previous]:hover:not(:disabled),
    [data-narration-prev]:hover:not(:disabled),
    [data-narration-next]:hover:not(:disabled) {
        transform: none;
    }
}

@media (forced-colors: active) {
    :where([data-lesson-narration], [data-narration-player], [data-narration-root]),
    [data-narration-toggle],
    [data-narration-play],
    [data-narration-stop],
    [data-narration-previous],
    [data-narration-prev],
    [data-narration-next],
    [data-narration-rate] {
        border: 1px solid CanvasText;
    }

    [data-narration-toggle],
    [data-narration-play] {
        background: Highlight;
        color: HighlightText;
    }
}