.reveal {
        position: relative;
        z-index: 1;
        width: 100%;
        height: 100%;
      }

      .reveal .slides {
        position: relative;
        width: 100%;
        height: 100%;
        overflow: hidden;
      }

      .reveal .slides section {
        position: absolute;
        inset: 0;
        text-align: left;
        padding: 3.8vh 4.5vw;
        opacity: 0;
        transform: translateY(14px) scale(0.99);
        transition:
          opacity 420ms ease,
          transform 520ms ease;
        pointer-events: none;
        overflow-y: auto;
      }

      .reveal .slides section.active {
        opacity: 1;
        transform: translateY(0) scale(1);
        pointer-events: auto;
      }

      h1,
      h2 {
        font-family:
          "Avenir Next", "Segoe UI", "SF Pro Display", "Helvetica Neue", Arial,
          sans-serif;
        margin: 0;
        line-height: 1.03;
      }

      h1 {
        font-size: clamp(2.6rem, 7vw, 6rem);
      }

      h2 {
        font-size: clamp(2rem, 5.4vw, 4.5rem);
      }

      .kicker {
        letter-spacing: 0.16em;
        text-transform: uppercase;
        color: var(--cyan);
        font-size: 0.8rem;
        font-weight: 700;
        margin-bottom: 1.2rem;
      }

      .hero-sub {
        color: var(--muted);
        font-size: clamp(1rem, 1.9vw, 1.45rem);
        margin-top: 1.3rem;
      }

      .title-hero h1 {
        animation: titleFloat 3.8s ease-in-out infinite;
        text-shadow: 0 6px 22px rgba(33, 141, 201, 0.2);
        max-width: 12ch;
      }

      .title-hero {
        max-width: min(980px, 92vw);
        margin: 0 auto;
      }

      .title-hero .hero-sub {
        animation: subtitleFade 4.2s ease-in-out infinite;
        max-width: 40ch;
      }

      .title-hero .title-meta {
        animation: metaPulse 3.2s ease-in-out infinite;
        margin-top: 2.1rem;
        color: var(--title-meta-color);
        font-weight: 600;
        letter-spacing: 0.01em;
      }

      @keyframes titleFloat {
        0%,
        100% {
          transform: translateY(0px);
        }
        50% {
          transform: translateY(-7px);
        }
      }

      @keyframes subtitleFade {
        0%,
        100% {
          opacity: 0.88;
        }
        50% {
          opacity: 1;
        }
      }

      @keyframes metaPulse {
        0%,
        100% {
          opacity: 0.9;
        }
        50% {
          opacity: 1;
        }
      }

      .glass {
        background: var(--glass);
        border: 1px solid var(--glass-stroke);
        border-radius: 22px;
        backdrop-filter: blur(8px);
      }

      .full {
        min-height: 72vh;
        display: grid;
        align-content: center;
      }

      .outcomes-card {
        margin-top: 1.5rem;
        padding: 1.2rem 1.3rem;
        max-width: 960px;
      }

      .outcomes-list {
        margin: 0;
        padding-left: 1.2rem;
        display: grid;
        gap: 0.7rem;
        color: var(--text);
        line-height: 1.45;
        font-size: clamp(1rem, 1.7vw, 1.3rem);
      }

      .outcomes-list strong {
        color: var(--title-contrast);
      }

      .question-stack {
        margin-top: 2rem;
      }

      .examples-grid {
        margin-top: 1.8rem;
        display: grid;
        grid-template-columns: repeat(3, minmax(220px, 1fr));
        gap: 1rem;
      }

      .example-card {
        padding: 1rem;
        border-radius: 20px;
        min-height: 320px;
        display: grid;
        grid-template-rows: auto 1fr auto;
        gap: 0.75rem;
      }

      .example-title {
        color: var(--title-contrast);
        font-size: 0.95rem;
        letter-spacing: 0.04em;
      }

      .example-figure {
        border-radius: 14px;
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.14);
        padding: 0.8rem;
        display: grid;
        place-items: center;
      }

      .example-note {
        font-size: 0.85rem;
        color: var(--note-contrast);
      }

      .test-wrap {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr 1fr;
        align-items: end;
        gap: 0.8rem;
      }

      .tube {
        width: 54px;
        height: 128px;
        border-radius: 0 0 18px 18px;
        border: 2px solid rgba(214, 236, 255, 0.7);
        position: relative;
        overflow: hidden;
        background: rgba(70, 108, 142, 0.2);
      }

      .liquid {
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        height: 64%;
        background: linear-gradient(180deg, #ff7a8a, #be3951);
        animation: pulseFill 1.8s ease-in-out infinite;
      }

      .risk-bars {
        width: 100%;
      }

      .risk-track {
        height: 10px;
        border-radius: 999px;
        background: rgba(255, 255, 255, 0.16);
        margin-bottom: 9px;
        overflow: hidden;
      }

      .risk-fill {
        height: 100%;
        border-radius: 999px;
      }

      .risk-fill.base {
        width: 12%;
        background: linear-gradient(90deg, #4de4c4, #2b8dab);
        animation: tinyGlow 1.8s ease-in-out infinite;
      }

      .risk-fill.test {
        width: 78%;
        background: linear-gradient(90deg, #ff9aa7, #d84b66);
      }

      .coin-zone {
        width: 100%;
        height: 150px;
        position: relative;
      }

      .coin {
        width: 78px;
        height: 78px;
        border-radius: 50%;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        background: radial-gradient(
          circle at 30% 30%,
          #ffe7a8,
          #efb952 65%,
          #b57627 100%
        );
        box-shadow: 0 8px 22px rgba(0, 0, 0, 0.34);
        display: grid;
        place-items: center;
        color: #5f3a00;
        font-weight: 800;
        animation: coinFlip 1.6s linear infinite;
      }

      .heads-row {
        position: absolute;
        left: 6%;
        right: 6%;
        bottom: 8px;
        display: flex;
        justify-content: space-between;
        color: var(--heads-contrast);
        font-size: 0.85rem;
      }

      .heads-row span {
        opacity: 0;
        animation: headPop 1.6s ease-in-out infinite;
      }

      .heads-row span:nth-child(2) {
        animation-delay: 0.12s;
      }
      .heads-row span:nth-child(3) {
        animation-delay: 0.24s;
      }
      .heads-row span:nth-child(4) {
        animation-delay: 0.36s;
      }
      .heads-row span:nth-child(5) {
        animation-delay: 0.48s;
      }
      .heads-row span:nth-child(6) {
        animation-delay: 0.6s;
      }

      .birthday-wrap {
        width: 100%;
        display: grid;
        gap: 0.7rem;
      }

      .birthday-grid {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0.4rem;
      }

      .birthday-pill {
        font-size: 0.7rem;
        padding: 0.22rem 0.32rem;
        text-align: center;
        border-radius: 999px;
        border: 1px solid rgba(255, 255, 255, 0.28);
        background: rgba(255, 255, 255, 0.06);
        color: var(--text);
      }

      .birthday-pill.match {
        border-color: rgba(255, 180, 120, 0.78);
        background: rgba(255, 172, 94, 0.24);
        color: var(--title-contrast);
      }

      .birthday-meter {
        display: grid;
        gap: 0.35rem;
      }

      .birthday-meter-label {
        font-size: 0.74rem;
        letter-spacing: 0.03em;
        color: var(--note-contrast);
      }

      .birthday-track {
        height: 10px;
        border-radius: 999px;
        background: rgba(255, 255, 255, 0.14);
        overflow: hidden;
      }

      .birthday-fill {
        width: 51%;
        height: 100%;
        border-radius: 999px;
        background: linear-gradient(90deg, #67d5f8, #5fa7ff);
        animation: barBreathe 1.7s ease-in-out infinite;
      }

      @keyframes pulseFill {
        0%,
        100% {
          height: 60%;
        }
        50% {
          height: 68%;
        }
      }

      @keyframes tinyGlow {
        0%,
        100% {
          filter: brightness(1);
        }
        50% {
          filter: brightness(1.25);
        }
      }

      @keyframes coinFlip {
        0% {
          transform: translate(-50%, -50%) rotateY(0deg);
        }
        100% {
          transform: translate(-50%, -50%) rotateY(360deg);
        }
      }

      @keyframes headPop {
        0% {
          opacity: 0;
          transform: translateY(5px);
        }
        35% {
          opacity: 1;
          transform: translateY(0);
        }
        100% {
          opacity: 0.55;
          transform: translateY(0);
        }
      }

      @keyframes barBreathe {
        0%,
        100% {
          opacity: 0.9;
        }
        50% {
          opacity: 1;
        }
      }