/* ================== KEYFRAMES (deduped/renamed) ================== */
    @keyframes cover-rise {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes cover-fade-in {
      to {
        opacity: 1;
      }
    }

    @keyframes cover-bounce {

      0%,
      100% {
        transform: translateY(0);
      }

      50% {
        transform: translateY(6px);
      }
    }

    @keyframes cover-scroll-left {
      from {
        transform: translateX(0);
      }

      to {
        transform: translateX(-50%);
      }
    }

    @keyframes cover-scroll-right {
      from {
        transform: translateX(-50%);
      }

      to {
        transform: translateX(0);
      }
    }

    @keyframes wall-rise {
      to {
        opacity: 1;
        transform: translateY(0) rotate(var(--tilt));
      }
    }

    @keyframes pulse {

      0%,
      100% {
        opacity: 1;
        transform: scale(1);
      }

      50% {
        opacity: 0.45;
        transform: scale(0.78);
      }
    }

    @keyframes aha1-claude-bob {
      0% {
        transform: translateY(0);
      }

      100% {
        transform: translateY(-3px);
      }
    }

    @keyframes aha1-leg-toggle-a {

      0%,
      49.99% {
        opacity: 1;
      }

      50%,
      100% {
        opacity: 0;
      }
    }

    @keyframes aha1-leg-toggle-b {

      0%,
      49.99% {
        opacity: 0;
      }

      50%,
      100% {
        opacity: 1;
      }
    }


    /* ================== SCOPE-COVER ================== */
    @scope (#slide-cover) {
      .cover-title {
        text-wrap: balance;
      }

      .cover::before {
        content: '';
        position: absolute;
        inset: 0;
        background: radial-gradient(ellipse at center,
            rgba(255, 250, 239, 0.55) 0%,
            rgba(255, 250, 239, 0.15) 35%,
            transparent 65%);
        pointer-events: none;
        z-index: 1;
      }

      .cover {
        width: 100vw;
        height: 100vh;
        display: flex;
        flex-direction: column;
        position: relative;
        z-index: 1;
        overflow: hidden;
      }

      .tape {
        position: absolute;
        height: clamp(18px, 2vw, 28px);
        z-index: 5;
        box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
      }

      .tape::before,
      .tape::after {
        content: '';
        position: absolute;
        top: 0;
        bottom: 0;
        width: 5px;
        background: rgba(255, 255, 255, 0.25);
      }

      .tape::before {
        left: 0;
      }

      .tape::after {
        right: 0;
      }

      .tape.t1 {
        top: clamp(0.8rem, 1.6vw, 1.6rem);
        left: clamp(1.5rem, 4vw, 4rem);
        width: clamp(90px, 10vw, 150px);
        background: var(--tape-mint);
        transform: rotate(-2deg);
      }

      .tape.t2 {
        top: clamp(0.8rem, 1.6vw, 1.6rem);
        right: clamp(2rem, 5vw, 5rem);
        width: clamp(70px, 8vw, 120px);
        background: var(--tape-coral);
        transform: rotate(2.5deg);
      }

      .marquee {
        flex-shrink: 0;
        height: clamp(80px, 12vh, 140px);
        display: flex;
        align-items: center;
        overflow: hidden;
        mask-image: linear-gradient(to right, transparent 0, #000 7%, #000 93%, transparent 100%);
        -webkit-mask-image: linear-gradient(to right, transparent 0, #000 7%, #000 93%, transparent 100%);
        position: relative;
        z-index: 2;
        opacity: 0;
        animation: cover-fade-in 1.4s ease forwards;
      }

      .marquee-top {
        margin-top: clamp(2.5rem, 6vh, 5rem);
        animation-delay: 0.1s;
      }

      .marquee-bottom {
        margin-bottom: clamp(1.2rem, 3vh, 2.5rem);
        animation-delay: 0.3s;
      }

      .marquee-track {
        display: flex;
        align-items: center;
        gap: clamp(50px, 6vw, 100px);
        width: max-content;
        animation-duration: 60s;
        animation-timing-function: linear;
        animation-iteration-count: infinite;
        will-change: transform;
      }

      .marquee-top .marquee-track {
        animation-name: cover-scroll-left;
      }

      .marquee-bottom .marquee-track {
        animation-name: cover-scroll-right;
        animation-duration: 75s;
      }

      .logo-item {
        height: clamp(42px, 5.6vh, 72px);
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        filter: saturate(0.82);
        opacity: 0.85;
        transition: filter 0.4s ease, opacity 0.4s ease, transform 0.4s ease;
      }

      .logo-item:hover {
        filter: saturate(1);
        opacity: 1;
        transform: scale(1.05);
      }

      .logo-item img {
        height: 100%;
        width: auto;
        max-width: 220px;
        display: block;
        object-fit: contain;
        -webkit-user-drag: none;
        user-select: none;
      }

      .title-block {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: clamp(1rem, 2.5vh, 2.5rem) clamp(2rem, 5vw, 5rem);
        min-height: 0;
        position: relative;
        z-index: 3;
      }

      .title-inner {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: clamp(0.5rem, 1.4vh, 1.4rem);
        max-width: 1200px;
      }

      .cover-kicker {
        font-family: 'Caveat', cursive;
        font-weight: 600;
        font-size: clamp(1.3rem, 1.9vw, 2.1rem);
        color: var(--coral);
        display: inline-flex;
        align-items: center;
        gap: 0.55em;
        opacity: 0;
        transform: translateY(14px);
        animation: cover-rise 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.25s forwards;
      }

      .cover-kicker::before {
        content: '✦';
        color: var(--mint);
        font-size: 0.85em;
      }

      .cover-title {
        font-family: 'Noto Sans SC', sans-serif;
        font-weight: 900;
        font-size: clamp(2.6rem, 6.2vw, 6.4rem);
        line-height: 1.05;
        letter-spacing: -0.012em;
        color: var(--ink);
        opacity: 0;
        transform: translateY(18px);
        animation: cover-rise 1s cubic-bezier(0.16, 1, 0.3, 1) 0.5s forwards;
      }

      .cover-title .underline {
        position: relative;
        display: inline-block;
      }

      .cover-title .underline::after {
        content: '';
        position: absolute;
        bottom: 8px;
        left: -3%;
        right: -3%;
        height: clamp(10px, 1.3vw, 18px);
        background: var(--coral-pale);
        z-index: -1;
        transform: skewX(-3deg);
        border-radius: 4px;
      }

      .cover-subtitle {
        font-family: 'Quicksand', 'Noto Sans SC', sans-serif;
        font-weight: 500;
        font-size: clamp(1.1rem, 1.65vw, 1.85rem);
        color: var(--ink-soft);
        line-height: 1.5;
        margin-top: clamp(0.3rem, 0.9vh, 0.9rem);
        opacity: 0;
        transform: translateY(14px);
        animation: cover-rise 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.75s forwards;
      }

      .cover-subtitle .sep {
        color: var(--coral);
        margin: 0 0.55em;
        font-weight: 700;
      }

      .scroll-hint {
        flex-shrink: 0;
        padding-bottom: clamp(1rem, 2.5vh, 2rem);
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.2em;
        font-family: 'Caveat', cursive;
        font-size: clamp(1rem, 1.25vw, 1.4rem);
        color: var(--ink-faint);
        position: relative;
        z-index: 3;
        opacity: 0;
        animation: cover-fade-in 1.4s ease 1.1s forwards;
      }

      .scroll-hint .arrow {
        font-size: 1.5em;
        line-height: 0.6;
        color: var(--coral);
        animation: cover-bounce 2.4s ease-in-out infinite;
        animation-delay: 1.5s;
      }

      @media (prefers-reduced-motion: reduce) {

        .marquee-track,
        .scroll-hint .arrow {
          animation: none !important;
        }

        .cover-kicker,
        .cover-title,
        .cover-subtitle,
        .marquee,
        .scroll-hint {
          opacity: 1 !important;
          transform: none !important;
        }
      }
    }