/* AI voiceover samples: a quiet editorial player inside the AI chapter. */
.ai-voiceover-section {
    --voice-ink: #20334d;
    --voice-muted: #6e7d91;
    --voice-line: #ced9e6;
    --voice-soft: rgba(255, 255, 255, .42);
    --voice-accent: #285cc4;
    width: 100%;
    margin: clamp(1.5rem, 3vw, 2.5rem) 0 0;
    padding: 0 0 clamp(1.5rem, 2.5vw, 2.5rem);
    border-top: 0;
    color: var(--voice-ink);
}

.ai-voiceover-heading {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, .9fr);
    align-items: end;
    gap: clamp(1.5rem, 5vw, 5rem);
    margin-bottom: clamp(2rem, 3.4vw, 3.4rem);
}

.ai-voiceover-kicker,
.ai-voiceover-card-note {
    margin: 0;
    color: var(--voice-accent);
    font-size: .62rem;
    font-weight: 650;
    letter-spacing: .14em;
    line-height: 1.2;
    text-transform: uppercase;
}

.ai-voiceover-heading h3 {
    margin: .65rem 0 0;
    color: var(--voice-ink);
    font-size: clamp(2rem, 3.4vw, 3.2rem);
    font-weight: 520;
    letter-spacing: -.045em;
    line-height: 1.02;
}

.ai-voiceover-intro {
    max-width: 42ch;
    margin: 0;
    color: var(--voice-muted);
    font-size: .92rem;
    line-height: 1.65;
}

.ai-voiceover-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(2rem, 4.5vw, 4.75rem);
    overflow: visible;
    border: 0;
    background: transparent;
}

.ai-voiceover-card {
    position: relative;
    isolation: isolate;
    display: flex;
    min-width: 0;
    flex-direction: column;
    padding: 1.2rem 0 .35rem;
    border: 0;
    background: transparent;
    transition: transform 300ms cubic-bezier(.2, .72, .2, 1);
}

.ai-voiceover-card::before {
    position: absolute;
    z-index: -1;
    top: -.45rem;
    right: -.05em;
    color: rgba(40, 92, 196, .08);
    font-family: var(--font-display, inherit);
    font-size: clamp(4.2rem, 6.6vw, 7.4rem);
    font-weight: 700;
    letter-spacing: -.08em;
    line-height: .8;
    transition: color 260ms ease, transform 300ms cubic-bezier(.2, .72, .2, 1);
    pointer-events: none;
}

.ai-voiceover-card:nth-child(1)::before { content: "01"; }
.ai-voiceover-card:nth-child(2)::before { content: "02"; }
.ai-voiceover-card:nth-child(3)::before { content: "03"; }

.ai-voiceover-card::after {
    content: "";
    position: absolute;
    inset: -.8rem -.9rem -1rem;
    z-index: -2;
    border-radius: 22px;
    background:
        radial-gradient(circle at 50% 58%, rgba(40, 92, 196, .18), transparent 58%),
        linear-gradient(145deg, rgba(255, 255, 255, .52), rgba(219, 231, 249, .16));
    box-shadow:
        0 0 0 1px rgba(40, 92, 196, .08),
        0 18px 48px rgba(40, 92, 196, .14),
        0 0 44px rgba(92, 146, 244, .14);
    opacity: 0;
    filter: blur(2px);
    transform: scale(.965);
    transition:
        opacity 520ms ease,
        filter 620ms ease,
        transform 620ms cubic-bezier(.2, .72, .18, 1);
    pointer-events: none;
}

.ai-voiceover-card.is-playing::after {
    opacity: 1;
    filter: blur(0);
    transform: scale(1);
    animation: ai-voiceover-active-glow 2.8s ease-in-out infinite;
}

.ai-voiceover-card.is-playing::before {
    color: rgba(40, 92, 196, .16);
}

@keyframes ai-voiceover-active-glow {
    0%, 100% {
        box-shadow:
            0 0 0 1px rgba(40, 92, 196, .08),
            0 18px 48px rgba(40, 92, 196, .12),
            0 0 38px rgba(92, 146, 244, .12);
    }
    50% {
        box-shadow:
            0 0 0 1px rgba(40, 92, 196, .14),
            0 20px 54px rgba(40, 92, 196, .18),
            0 0 54px rgba(92, 146, 244, .2);
    }
}

@media (hover: hover) {
    .ai-voiceover-card:hover {
        transform: none;
    }

    .ai-voiceover-card:hover::before {
        color: rgba(40, 92, 196, .14);
        transform: none;
    }
}

.ai-voiceover-time {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.ai-voiceover-card h4 {
    max-width: 70%;
    margin: 0 0 .5rem;
    color: var(--voice-ink);
    font-size: clamp(1.2rem, 1.8vw, 1.55rem);
    font-weight: 550;
    letter-spacing: -.035em;
    line-height: 1.1;
}

.ai-voiceover-card p {
    margin: 0;
    color: var(--voice-muted);
    font-size: .78rem;
    line-height: 1.55;
}

.ai-voiceover-player {
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr);
    align-items: center;
    gap: .85rem;
    margin-top: clamp(1.75rem, 3vw, 2.65rem);
    padding-top: 0;
}

.ai-voiceover-visualizer {
    grid-column: 1 / -1;
    width: 100%;
    height: 42px;
    margin-bottom: .2rem;
    border-bottom: 0;
    -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 7%, #000 93%, transparent 100%);
    mask-image: linear-gradient(90deg, transparent 0, #000 7%, #000 93%, transparent 100%);
    opacity: .78;
    transition: opacity .3s ease;
}

/* The samples belong to the same section surface; keep the player free of
   card fills and column dividers. */
.ai-voiceover-grid,
.ai-voiceover-card {
    border: 0 !important;
    background: transparent !important;
    box-shadow: none !important;
}

.ai-voiceover-card.is-playing .ai-voiceover-visualizer {
    opacity: 1;
}

.ai-voiceover-waveform {
    display: block;
    width: 100%;
    height: 42px;
}

.ai-voiceover-play {
    display: grid;
    width: 42px;
    height: 42px;
    place-items: center;
    border: 1px solid var(--voice-ink);
    border-radius: 50% !important;
    background: var(--voice-ink);
    color: #fff;
    box-shadow: 0 8px 22px rgba(32, 51, 77, .14);
    cursor: pointer;
    transition: transform .25s ease, background-color .25s ease, color .25s ease;
}

.ai-voiceover-play:hover,
.ai-voiceover-play:focus-visible {
    background: var(--voice-accent);
    border-color: var(--voice-accent);
    transform: scale(1.05);
}

.ai-voiceover-play:focus-visible,
.ai-voiceover-progress:focus-visible {
    outline: 2px solid var(--voice-accent);
    outline-offset: 4px;
}

.ai-voiceover-play-icon {
    width: 0;
    height: 0;
    margin-left: 3px;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 9px solid currentColor;
}

.ai-voiceover-card.is-playing .ai-voiceover-play-icon {
    width: 10px;
    height: 12px;
    margin-left: 0;
    border: 0;
    border-left: 3px solid currentColor;
    border-right: 3px solid currentColor;
}

.ai-voiceover-controls {
    min-width: 0;
}

.ai-voiceover-time {
    margin-bottom: .45rem;
    color: var(--voice-muted);
    font-size: .66rem;
    font-variant-numeric: tabular-nums;
    letter-spacing: .04em;
}

.ai-voiceover-progress {
    --progress: 0%;
    display: block;
    width: 100%;
    height: 4px;
    margin: 0;
    appearance: none;
    border: 0;
    border-radius: 99px;
    background: linear-gradient(to right, var(--voice-accent) 0 var(--progress), var(--voice-line) var(--progress) 100%);
    cursor: pointer;
}

.ai-voiceover-progress::-webkit-slider-runnable-track {
    height: 4px;
    background: transparent;
}

.ai-voiceover-progress::-webkit-slider-thumb {
    width: 11px;
    height: 11px;
    margin-top: -3.5px;
    appearance: none;
    border: 2px solid var(--voice-accent);
    border-radius: 50%;
    background: var(--voice-soft);
}

.ai-voiceover-progress::-moz-range-track {
    height: 4px;
    background: transparent;
}

.ai-voiceover-progress::-moz-range-progress {
    height: 4px;
    border-radius: 99px;
    background: var(--voice-accent);
}

.ai-voiceover-progress::-moz-range-thumb {
    width: 8px;
    height: 8px;
    border: 2px solid var(--voice-accent);
    border-radius: 50%;
    background: var(--voice-soft);
}

html[data-theme="dark"] .ai-voiceover-section {
    --voice-ink: #e7edf6;
    --voice-muted: #9eafc4;
    --voice-line: rgba(168, 191, 220, .24);
    --voice-soft: rgba(255, 255, 255, .045);
    --voice-accent: #82b3ff;
}

html[data-theme="dark"] .ai-voiceover-card::before {
    color: rgba(130, 179, 255, .09);
}

html[data-theme="dark"] .ai-voiceover-card::after {
    background:
        radial-gradient(circle at 50% 58%, rgba(130, 179, 255, .2), transparent 58%),
        linear-gradient(145deg, rgba(34, 57, 91, .5), rgba(12, 27, 49, .2));
    box-shadow:
        0 0 0 1px rgba(130, 179, 255, .12),
        0 18px 48px rgba(0, 0, 0, .24),
        0 0 48px rgba(72, 134, 231, .16);
}

html[data-theme="dark"] .ai-voiceover-card.is-playing::before {
    color: rgba(130, 179, 255, .2);
}

@media (hover: hover) {
    html[data-theme="dark"] .ai-voiceover-card:hover::before {
        color: rgba(130, 179, 255, .16);
    }
}

html[data-theme="dark"] .ai-voiceover-play {
    background: var(--voice-accent);
    border-color: var(--voice-accent);
    color: #102039;
}

@media (max-width: 900px) {
    .ai-voiceover-heading {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .ai-voiceover-grid {
        grid-template-columns: 1fr;
        gap: 2.75rem;
    }

    .ai-voiceover-card {
        min-height: 0;
    }
}

@media (max-width: 520px) {
    .ai-voiceover-section {
        margin-top: 2.5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .ai-voiceover-play {
        transition: none;
    }

    .ai-voiceover-card.is-playing::after {
        animation: none;
    }
}

/* Volume stays out of the way until a sample is actually started. The speaker
   button is the visible affordance; the range only appears on demand. */
.ai-voiceover-volume {
    position: relative;
    display: flex;
    min-height: 1.75rem;
    align-items: center;
    justify-content: flex-end;
    margin-top: .55rem;
    color: var(--voice-muted);
    font-size: .62rem;
    line-height: 1;
}

.ai-voiceover-volume[hidden],
.ai-voiceover-volume-popover[hidden] {
    display: none;
}

.ai-voiceover-volume-toggle {
    display: grid;
    width: 1.75rem;
    height: 1.75rem;
    place-items: center;
    padding: 0;
    border: 1px solid var(--voice-line);
    border-radius: 0;
    background: transparent;
    color: var(--voice-muted);
    cursor: pointer;
    transition: border-color .2s ease, background-color .2s ease, color .2s ease;
}

.ai-voiceover-volume-toggle:hover,
.ai-voiceover-volume-toggle:focus-visible,
.ai-voiceover-volume.is-open .ai-voiceover-volume-toggle {
    border-color: var(--voice-accent);
    background: var(--voice-accent);
    color: #fff;
}

.ai-voiceover-volume-toggle:focus-visible {
    outline: 2px solid var(--voice-accent);
    outline-offset: 3px;
}

.ai-voiceover-volume-icon {
    width: 1rem;
    height: 1rem;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.7;
}

.ai-voiceover-volume-popover {
    position: absolute;
    right: 0;
    bottom: calc(100% + .45rem);
    z-index: 3;
    display: flex;
    width: min(11rem, calc(100vw - 2rem));
    align-items: center;
    gap: .6rem;
    padding: .65rem .7rem;
    border: 1px solid var(--voice-line);
    border-radius: 0;
    background: rgba(255, 255, 255, .96);
    box-shadow: 0 12px 28px rgba(32, 51, 77, .16);
    opacity: 0;
    pointer-events: none;
    transform: translateY(5px);
    transition: opacity .18s ease, transform .18s ease;
}

.ai-voiceover-volume.is-open .ai-voiceover-volume-popover:not([hidden]) {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.ai-voiceover-volume-range {
    --volume: 25%;
    flex: 1 1 auto;
    width: 100%;
    height: 3px;
    appearance: none;
    border: 0;
    border-radius: 99px;
    background: linear-gradient(to right, var(--voice-accent) 0 var(--volume), var(--voice-line) var(--volume) 100%);
    cursor: pointer;
}

.ai-voiceover-volume-range::-webkit-slider-runnable-track {
    height: 3px;
    background: transparent;
}

.ai-voiceover-volume-range::-webkit-slider-thumb {
    width: 9px;
    height: 9px;
    margin-top: -3px;
    appearance: none;
    border: 2px solid var(--voice-accent);
    border-radius: 50%;
    background: var(--voice-soft);
}

.ai-voiceover-volume-range::-moz-range-track {
    height: 3px;
    background: var(--voice-line);
}

.ai-voiceover-volume-range::-moz-range-progress {
    height: 3px;
    border-radius: 99px;
    background: var(--voice-accent);
}

.ai-voiceover-volume-range::-moz-range-thumb {
    width: 7px;
    height: 7px;
    border: 2px solid var(--voice-accent);
    border-radius: 50%;
    background: var(--voice-soft);
}

.ai-voiceover-volume-range:focus-visible {
    outline: 2px solid var(--voice-accent);
    outline-offset: 4px;
}

.ai-voiceover-volume-popover output {
    min-width: 2.3rem;
    color: var(--voice-muted);
    font-variant-numeric: tabular-nums;
    text-align: right;
}

html[data-theme="dark"] .ai-voiceover-volume-popover {
    border-color: rgba(168, 191, 220, .3);
    background: rgba(15, 30, 53, .97);
    box-shadow: 0 12px 28px rgba(0, 0, 0, .25);
}