@layer ocean {
  body { isolation: isolate; }
  main, footer { position: relative; z-index: 2; }
  [hidden] { display: none !important; }

  /* The scenery is separate from the exact-color interface studies. */
  .ocean-world, .ocean-foreground, .bubble-field {
    position: fixed;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    contain: layout paint;
  }
  .ocean-world {
    z-index: 0;
    --water-light: 1;
    --look-x: 0px;
    --look-y: 0px;
    background: #00090E;
  }
  .water-column {
    position: absolute;
    inset: 0;
    background:
      radial-gradient(ellipse at 65% -18%, #427F77 0, #103E46 26%, transparent 65%),
      radial-gradient(ellipse at 0 55%, #0A3035, transparent 50%),
      linear-gradient(#031F2B, #001219 65%, #000509);
    opacity: calc(1 - var(--descent, 0) * .7);
    transition: opacity .8s ease;
  }
  .water-light {
    position: absolute;
    inset: 0;
    opacity: var(--water-light);
    transition: opacity 1.2s ease;
  }
  .water-surface {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: calc(.35 + var(--water-light) * .65);
  }
  .water-ceiling {
    position: absolute;
    top: -29%;
    left: -20%;
    width: 140%;
    height: 65%;
    background: url("water-light.svg") center / 800px 400px;
    opacity: .65;
    transform: perspective(450px) rotateX(-48deg) scale(1.2);
    mask-image: linear-gradient(#000 15%, transparent 95%);
    animation: surface-drift 22s ease-in-out infinite alternate;
  }
  .light-shafts {
    position: absolute;
    inset: -20% -30% -30%;
    background: conic-gradient(from 148deg at 65% 0,
      transparent 0deg, #A2DEC215 5deg, transparent 9deg,
      transparent 16deg, #A2DEC22B 19deg, transparent 23deg,
      transparent 30deg, #A2DEC219 33deg, transparent 37deg,
      transparent 42deg, #A2DEC227 45deg, transparent 50deg,
      transparent 57deg, #A2DEC213 60deg, transparent 66deg);
    filter: blur(8px);
    transform-origin: 65% 0;
    mask-image: linear-gradient(#000, transparent 95%);
    animation: shaft-drift 18s ease-in-out infinite alternate;
  }
  .light-shafts.secondary {
    opacity: .45;
    transform: scaleX(-1);
    animation-delay: -9s;
    animation-direction: alternate-reverse;
  }
  .reading-shade {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, #00070BA8 25%, #00070BB8 68%, transparent),
      linear-gradient(transparent 70%, #00070B66);
  }
  .kelp-bed { position: absolute; inset: 0; }
  .kelp {
    position: absolute;
    bottom: -14%;
    height: 107%;
    width: auto;
    max-width: none;
    transform-origin: 50% 100%;
    animation: kelp-sway 6.5s ease-in-out infinite alternate;
  }
  .kelp.left { left: -2%; }
  .kelp.right { right: -3%; scale: -1 1; animation-delay: -5s; animation-duration: 8.5s; }
  .kelp-far {
    opacity: .34;
    filter: blur(3px);
    transform: translate(calc(var(--look-x) * .2), calc(var(--look-y) * .2)) scale(.83);
  }
  .kelp-far .left { left: 6%; bottom: -21%; }
  .kelp-far .right { right: 7%; height: 91%; }
  .kelp-far .kelp { animation-duration: 10s; }
  .kelp-middle {
    opacity: calc(.85 - var(--descent, 0) * .45);
    transform: translate(calc(var(--look-x) * .5), calc(var(--look-y) * .5));
  }
  .kelp-middle .right { height: 90%; bottom: -10%; }
  .kelp.sprig { left: var(--x); height: var(--h); animation-delay: var(--lag); }
  .kelp.sprig:nth-child(even) { scale: -1 1; animation-duration: 12s; }
  .ocean-foreground {
    z-index: 4;
    inset: max(100px, 12vh) 0 max(150px, 18vh);
    --kelp-edge: clamp(20px, calc((100vw - var(--content)) / 2 - 18px), 128px);
    /* Clip the moving foliage to the gutters, clear of reading and fixed controls. */
    mask-image: linear-gradient(90deg, #000, #000 calc(var(--kelp-edge) * .35), transparent var(--kelp-edge), transparent calc(100% - var(--kelp-edge)), #000 calc(100% - var(--kelp-edge) * .35));
  }
  .kelp-near { opacity: .85; mask-image: linear-gradient(transparent, #000 12% 80%, transparent); }
  .kelp-near .kelp {
    height: 106%;
    bottom: -8%;
    filter: blur(5px) brightness(1.6);
    animation: near-sway 7.5s ease-in-out infinite alternate;
  }
  .kelp-near .left { left: var(--kelp-edge); translate: -78% 0; }
  .kelp-near .right { right: var(--kelp-edge); translate: 78% 0; height: 94%; animation-duration: 9.5s; animation-delay: -5s; }
  .distant-shoal {
    position: absolute;
    top: 23%;
    left: 62%;
    width: min(34vw, 480px);
    color: #000F19;
    opacity: calc(.55 * (1 - var(--descent, 0)));
    filter: blur(.7px);
    animation: shoal-drift 38s ease-in-out infinite alternate;
  }
  .marine-snow {
    position: absolute;
    inset: -120px -40px;
    background-image: radial-gradient(1px 1px at 30px 70px, #C3DDCF80 70%, transparent),
      radial-gradient(1px 1px at 130px 210px, #93A1A170 70%, transparent),
      radial-gradient(2px 2px at 220px 130px, #93A1A144 70%, transparent);
    background-size: 307px 293px;
    animation: snow-drift 28s linear infinite;
  }
  .snow-far { opacity: .32; }
  .snow-near { opacity: .27; background-size: 479px 437px; filter: blur(1px); animation-duration: 20s; animation-direction: reverse; }
  .bubble-field { z-index: 6; }
  .bubble-field i {
    position: absolute;
    aspect-ratio: 1;
    border: 1px solid #BFE3DAAA;
    border-radius: 50%;
    background: radial-gradient(circle at 28% 24%, #FDF6E377, transparent 35%);
    box-shadow: inset 1px 1px 3px #EEE8D544;
    animation: bubble-rise var(--flight) linear both;
  }
  @keyframes bubble-rise {
    from { opacity: 0; transform: translate(-50%, -50%) scale(.6); }
    12% { opacity: .8; }
    50% { transform: translate(calc(-50% - var(--drift) * .3), calc(-50% + var(--rise) * .5)) scale(1); }
    to { opacity: 0; transform: translate(calc(-50% + var(--drift)), calc(-50% + var(--rise))) scale(1.2); }
  }

  .hero {
    grid-template-columns: 1fr;
    justify-items: center;
    padding-top: clamp(95px, 16vh, 180px);
    gap: 100px;
  }
  .hero-copy { max-width: 970px; text-align: center; }
  .hero .eyebrow { justify-content: center; font-size: .66rem; letter-spacing: .22em; }
  .hero-copy h1 {
    margin: 34px -25px 30px;
    font-size: clamp(4rem, 7.5vw, 7.4rem);
    font-weight: 440;
    line-height: .98;
    letter-spacing: -.07em;
    color: var(--dsf-solid-warm);
    text-shadow: 0 4px 60px #000;
  }
  .hero-copy h1 em {
    margin-top: 0;
    color: #A6BEB8;
    font-family: Georgia, "Times New Roman", serif;
    font-weight: 400;
    font-style: italic;
    letter-spacing: -.065em;
  }
  .hero-lede { max-width: 540px; margin: 0 auto 32px; font-size: 1.02rem; }
  .hero-actions, .hero-facts { justify-content: center; }
  .hero-facts { margin-top: 44px; }
  .hero-facts div:first-child { padding-left: 28px; }
  .descent-cue {
    display: inline-flex;
    align-items: center;
    gap: 13px;
    margin-top: 50px;
    color: var(--dsf-solid-text);
    font: .58rem var(--mono);
    letter-spacing: .19em;
    text-decoration: none;
  }
  .descent-cue span { height: 35px; width: 1px; background: linear-gradient(transparent, var(--dsf-solid-accent)); }
  .descent-cue b { color: var(--dsf-solid-accent); font-size: 1rem; }
  .workstation-wrap { width: min(850px, 100%); }
  .workstation { box-shadow: 0 40px 100px #000B; }
  .surface-decision, .palette-section, .applications, .final-cta {
    width: min(1320px, calc(100% - 96px));
    margin-inline: auto;
    background: #001219C9;
    border: 1px solid var(--dsf-overlay-separator);
    border-radius: 12px;
  }
  .surface-decision .section-shell, .palette-section .section-shell,
  .applications .section-shell, .final-cta .section-shell {
    width: min(1080px, calc(100% - 64px));
  }
  .surface-stage { width: min(1080px, calc(100% - 64px)); margin-inline: auto; }
  .principles, .hierarchy, .extension-note, .footer-grid { max-width: min(1120px, calc(100% - 128px)); }
  .principle-grid article { background: #00090DBB; }
  .site-header { width: min(1180px, calc(100% - 80px)); }
  .site-header nav a, .header-download { text-shadow: 0 2px 9px #000; }
  .section-intro h2, .hierarchy h2, .extension-note h2 { text-wrap: balance; }
  footer { background: #00090DD9; margin-top: 80px; padding-bottom: 64px; }
  .final-mark { opacity: .35; }

  .dive-entry {
    display: none;
    position: fixed;
    z-index: 30;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
  }
  .is-diving .dive-entry { display: block; animation: dive-clear 2.8s ease both; }
  .surface-crossing {
    position: absolute;
    inset: -100%;
    background: linear-gradient(#03151B 25%, #255553 44%, #90B8A4AA 49.4%, #102F38 50.4%, #001018EE 70%);
    animation: cross-surface 2.8s cubic-bezier(.3, .05, .15, 1) both;
  }
  .surface-crossing::after {
    content: "";
    position: absolute;
    inset: 37% 0 46%;
    background: url("water-light.svg") center / 800px 400px;
    opacity: .65;
    filter: blur(2px);
    mask-image: linear-gradient(transparent, #000 30% 70%, transparent);
  }
  .dive-entry > p {
    position: absolute;
    top: 48%;
    width: 100%;
    text-align: center;
    color: var(--dsf-solid-warm);
    font: .65rem var(--mono);
    letter-spacing: .35em;
    animation: entry-caption 2.8s ease both;
  }
  .entry-bubbles i {
    position: absolute;
    top: 110%;
    left: 13%;
    width: 27px;
    aspect-ratio: .85;
    border: 1px solid #D0E5CF88;
    border-radius: 47% 53% 41% 59%;
    box-shadow: inset 2px 3px 5px #EEE8D566, 0 0 12px #00A59133;
    animation: entry-bubble 2.6s cubic-bezier(.16, .4, .5, 1) both;
  }
  .entry-bubbles i:nth-child(2) { left: 24%; width: 12px; animation-delay: .15s; }
  .entry-bubbles i:nth-child(3) { left: 77%; width: 44px; animation-delay: .1s; filter: blur(2px); }
  .entry-bubbles i:nth-child(4) { left: 66%; width: 18px; animation-delay: .3s; }
  .entry-bubbles i:nth-child(5) { left: 89%; width: 70px; filter: blur(3px); }
  .entry-bubbles i:nth-child(6) { left: 5%; width: 85px; filter: blur(4px); animation-delay: .2s; }
  .is-diving .ocean-world { animation: camera-descent 2.8s var(--ease-out) both; }
  .scene-controls {
    position: fixed;
    z-index: 50;
    bottom: max(18px, env(safe-area-inset-bottom));
    right: max(18px, env(safe-area-inset-right));
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    max-width: calc(100vw - 36px);
    gap: 5px;
    padding: 4px;
    border: 1px solid var(--dsf-overlay-separator);
    border-radius: 7px;
    background: #00131BEC;
  }
  .dive-controls { display: contents; }
  .scene-controls button, .music-fallback {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 6px 13px;
    border: 0;
    border-radius: 3px;
    background: transparent;
    color: var(--dsf-solid-warm);
    font: .65rem var(--mono);
    cursor: pointer;
    text-decoration: none;
  }
  .scene-controls button:hover, .music-fallback:hover { background: var(--dsf-overlay-hover); }
  #motion-toggle, #music-toggle { border: 1px solid color-mix(in srgb, var(--dsf-solid-accent) 70%, var(--dsf-solid-panel)); box-shadow: 0 0 9px color-mix(in srgb, var(--dsf-solid-accent) 18%, transparent); }
  .scene-controls button > span:first-child { color: var(--dsf-solid-accent); margin-right: 7px; }
  #skip-dive, .music-status { position: absolute; bottom: calc(100% + 8px); right: 0; background: #00131BF5; border: 1px solid var(--dsf-overlay-separator); border-radius: 7px; }
  .music-status { width: min(280px, calc(100vw - 36px)); margin: 0; padding: 8px 10px; color: var(--dsf-solid-text); font: .65rem/1.5 var(--mono); }
  .is-diving .music-status { bottom: calc(100% + 60px); }
  .music-status:empty { width: 1px; height: 1px; padding: 0; border: 0; overflow: hidden; clip-path: inset(50%); }
  #music-toggle[data-state="playing"] { background: var(--dsf-overlay-hover); }
  #music-toggle[data-state="error"] { box-shadow: inset 0 0 0 1px var(--dsf-solid-warning); }
  .depth-gauge {
    position: fixed;
    z-index: 5;
    bottom: 28px;
    left: 24px;
    display: flex;
    gap: 15px;
    color: var(--dsf-solid-text);
    font: .5rem var(--mono);
    letter-spacing: .15em;
    pointer-events: none;
  }
  .depth-gauge strong { display: block; margin: 7px 0 9px; color: var(--dsf-solid-warm); font-size: 1.15rem; font-weight: 400; }
  .depth-gauge small { font-size: .5rem; }
  .depth-track { position: relative; width: 8px; border-block: 1px solid var(--dsf-solid-border); background: repeating-linear-gradient(transparent 0 7px, #586E7577 7px 8px); }
  .depth-track i { position: absolute; top: calc(var(--depth-progress, 0) * 100%); width: 14px; height: 2px; background: var(--dsf-solid-accent); }
  .replay-dive {
    min-height: 44px;
    margin-top: 12px;
    padding: 0;
    border: 0;
    background: none;
    color: var(--dsf-solid-accent);
    font: .7rem var(--mono);
    cursor: pointer;
  }
  .copy-toast { bottom: 145px; }

  /* Keep the free-roaming nautilus above the ocean, but below every readable surface. */
  .nautilus-zone { position: fixed; inset: 0; z-index: 1; overflow: hidden; pointer-events: none; contain: layout paint; }
  .nautilus {
    position: absolute; top: 50%; left: 50%;
    width: clamp(120px, 16vw, 190px); max-width: 90%; max-height: 80%;
    transform: translate(-50%, -50%); transform-origin: 50% 50%;
  }
  .nautilus-zone:not([data-nautilus-state]) .nautilus,
  .nautilus-zone[data-nautilus-state="static"] .nautilus {
    top: 75%; left: 80%; max-width: 35%; max-height: 40%;
  }
  .is-diving .nautilus-zone { visibility: hidden; }
  .blobfish-zone { position: relative; height: clamp(340px, 38vw, 430px); margin-top: 28px; overflow: hidden; }
  .blobfish-hideout { position: relative; width: min(840px, 100%); height: 100%; margin-inline: auto; }
  .blobfish-toggle { position: absolute; inset: 0; display: block; cursor: pointer; border-radius: 12px; }
  .blobfish {
    position: absolute; z-index: 1; width: clamp(230px, 56%, 420px); height: auto;
    left: 50%; bottom: 52px;
    transform: translate(-50%, 85px) scale(.88);
    transition: transform 1.6s cubic-bezier(.22, .61, .36, 1);
  }
  .blobfish-cover { position: absolute; z-index: 2; inset: 0; pointer-events: none; }
  .cover-kelp {
    position: absolute; bottom: -50%; left: var(--x); width: clamp(200px, 40%, 336px); max-width: none;
    transform-origin: 50% 100%; translate: -50% 0; rotate: var(--lean);
    animation: kelp-sway 8s ease-in-out var(--lag) infinite alternate;
    transition: translate 1.6s cubic-bezier(.22, .61, .36, 1), rotate 1.6s ease;
  }
  .cover-kelp:nth-child(even) { scale: -1 1; animation-duration: 9.5s; }
  .blobfish-hint {
    position: absolute; z-index: 3; bottom: 15px; width: 100%; text-align: center;
    color: var(--dsf-solid-text); font: .65rem var(--mono); transition: opacity .4s ease;
  }
  #blobfish-awake:checked + .blobfish-toggle .blobfish { transform: translate(-50%, -45px); }
  #blobfish-awake:checked + .blobfish-toggle .cover-kelp { translate: calc(-50% + var(--part) * clamp(150px, 24vw, 230px)) 80px; rotate: calc(var(--lean) + var(--part) * 12deg); }
  #blobfish-awake:checked + .blobfish-toggle .blobfish-hint { opacity: 0; }
  #blobfish-awake:focus-visible + .blobfish-toggle::after {
    content: ""; position: absolute; z-index: 4; inset: 4px; pointer-events: none;
    border: 2px solid var(--dsf-solid-light-edge); border-radius: 8px;
  }
  .angler-zone { display: flex; justify-content: flex-end; min-height: 320px; padding: 0 clamp(16px, 10vw, 180px); }
  .angler-discovery { position: relative; width: min(380px, 100%); }
  .angler-toggle { display: block; cursor: pointer; }
  .angler { width: 100%; overflow: visible; }
  .angler-drift { animation: angler-drift 9s ease-in-out infinite alternate; transform-origin: center; }
  .fish-body { opacity: 0; }
  #angler-awake:checked + .angler-toggle .fish-body { opacity: 1; transition: opacity 1.2s ease; }
  .lure-focus { opacity: 0; }
  #angler-awake:focus-visible + .angler-toggle .lure-focus { opacity: 1; }
  .angler-lure { animation: lure-breathe 4s ease-in-out infinite alternate; }
  .lure-bulb { filter: drop-shadow(0 0 5px #EEE8D5) drop-shadow(0 0 14px var(--dsf-solid-accent)); }

  @keyframes surface-drift {
    to { transform: perspective(450px) rotateX(-48deg) scale(1.3) translate(2%, 3%); }
  }
  @keyframes shaft-drift { from { rotate: -4deg; } to { rotate: 5deg; } }
  @keyframes kelp-sway { from { transform: translateX(-12px) rotate(-8deg) skewX(-4deg); } to { transform: translateX(12px) rotate(9deg) skewX(5deg); } }
  @keyframes near-sway { from { transform: translate(-6px, 2px) rotate(-4deg) skewX(-2deg); } to { transform: translate(8px, -4px) rotate(4deg) skewX(3deg); } }
  @keyframes shoal-drift { from { transform: translateX(5%) translateY(0); } to { transform: translateX(-60%) translateY(-20px); } }
  @keyframes snow-drift { from { transform: translate(0, 70px); } to { transform: translate(30px, -120px); } }
  @keyframes angler-drift { to { transform: translateY(-9px) rotate(-3deg); } }
  @keyframes lure-breathe { from { opacity: .8; } to { opacity: 1; } }
  @keyframes dive-clear { 0%, 40% { opacity: 1; } 100% { opacity: 0; } }
  @keyframes cross-surface { from { transform: translateY(27%); } to { transform: translateY(-32%); } }
  @keyframes entry-caption { 0%, 25% { opacity: .8; } 55%, 100% { opacity: 0; } }
  @keyframes entry-bubble { from { transform: translateY(0) scale(.6); } to { transform: translateY(-130vh) scale(1.4); } }
  @keyframes camera-descent { from { transform: scale(1.16) translateY(6%); } to { transform: none; } }

  @media (max-width: 1100px) {
    .hero { padding-top: 110px; gap: 80px; }
    .hero-copy h1 { font-size: clamp(4rem, 9vw, 6rem); }
    .kelp-middle .left { left: -11%; }
    .kelp-middle .right { right: -11%; }
    .depth-gauge { left: 12px; }
    .depth-gauge > div { display: none; }
    .depth-track { height: 70px; }
  }
  @media (max-width: 780px) {
    .site-header { width: calc(100% - 40px); }
    .hero { width: calc(100% - 48px); padding-top: 90px; gap: 70px; }
    .hero-copy h1 { margin-inline: 0; font-size: clamp(3.3rem, 10vw, 5rem); }
    .hero-copy h1 em { line-height: 1.05; }
    .hero-lede { max-width: 430px; font-size: .92rem; }
    .hero-facts div, .hero-facts div:first-child { padding-inline: 12px; }
    .surface-decision, .palette-section, .applications, .final-cta { width: calc(100% - 32px); border-radius: 8px; }
    .surface-decision .section-shell, .palette-section .section-shell,
    .applications .section-shell, .final-cta .section-shell, .surface-stage { width: calc(100% - 32px); }
    .principles, .hierarchy, .footer-grid, .footer-bottom { max-width: calc(100% - 64px); }
    .kelp-middle { opacity: .6; }
    .kelp-middle .kelp { height: 88%; }
    .kelp-middle .left { left: -150px; }
    .kelp-middle .right { right: -155px; height: 75%; }
    .kelp-far .left { left: -120px; }
    .kelp-far .right { right: -120px; }
    .kelp-far .sprig { left: calc(var(--x) - 26%); height: calc(var(--h) * .75); }
    .kelp-middle .sprig { left: calc(var(--x) - 17%); opacity: .65; }
    .water-ceiling { top: -14%; height: 50%; }
    .water-light { opacity: calc(var(--water-light) * .85); }
    .reading-shade { background: linear-gradient(90deg, transparent, #00070B99 15% 85%, transparent); }
    .depth-gauge { display: none; }
    .scene-controls { bottom: max(12px, env(safe-area-inset-bottom)); right: max(12px, env(safe-area-inset-right)); max-width: calc(100vw - 24px); }
    .scene-controls button, .music-fallback { padding: 6px 10px; font-size: .6rem; }
    .descent-cue { margin-top: 35px; font-size: .5rem; }
  }
  /* Freeze all motion, including the original cursor and scroll animations. */
  body:not(.ocean-ready) *, body:not(.ocean-ready) *::before, body:not(.ocean-ready) *::after,
  .motion-paused *, .motion-paused *::before, .motion-paused *::after,
  .page-hidden *, .page-hidden *::before, .page-hidden *::after { animation-play-state: paused !important; }
  .motion-paused, .motion-paused * { scroll-behavior: auto !important; transition: none !important; }
  @media (prefers-reduced-motion: reduce) {
    .dive-entry { display: none !important; }
    .ocean-world, .kelp-bed { transform: none !important; }
    .water-ceiling { animation: none; }
    .angler-drift { animation: none; }
  }
  .photo-reference { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); margin-top: 48px; border: 1px solid var(--dsf-solid-border); border-radius: 8px; background: var(--dsf-solid-panel); overflow: hidden; }
  .photo-reference img { width: 100%; height: auto; }
  .photo-reference > a:focus-visible { outline-offset: -4px; }
  .photo-reference figcaption { padding: clamp(20px, 3vw, 32px); align-self: center; font-size: .85rem; }
  .photo-reference h3 { margin-block: 12px; color: var(--dsf-solid-warm); font-size: 1.45rem; line-height: 1.25; }
  .photo-reference p + p { margin-top: 16px; }
  @media (max-width: 780px) { .photo-reference { grid-template-columns: 1fr; } }
}