:root {
  --ink: #f5fbff;
  --muted: #a9c1d1;
  --panel: rgba(13, 34, 52, 0.78);
  --line: rgba(211, 238, 250, 0.16);
  --accent: #ffd45c;
  --accent-rgb: 255, 212, 92;
  --deep: #071420;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; overflow-x: hidden; }
body {
  background: #071420;
  color: var(--ink);
  font-family: "Segoe UI Variable", "Segoe UI", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
button { font: inherit; }

.learning-path {
  --accent: #ffd45c;
  --accent-rgb: 255, 212, 92;
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(circle at 78% 15%, rgba(var(--accent-rgb), .12), transparent 28%),
    linear-gradient(145deg, #081a2a 0%, #07131f 55%, #0a2030 100%);
  transition: background 700ms ease;
}

.tone-blue { --accent:#70d5ff; --accent-rgb:112,213,255; }
.tone-indigo { --accent:#a6a7ff; --accent-rgb:166,167,255; }
.tone-lime { --accent:#b9e46d; --accent-rgb:185,228,109; }
.tone-coral { --accent:#ff8f74; --accent-rgb:255,143,116; }
.tone-cyan { --accent:#6ce0da; --accent-rgb:108,224,218; }
.tone-violet { --accent:#c296ff; --accent-rgb:194,150,255; }
.tone-orange { --accent:#ffb34d; --accent-rgb:255,179,77; }
.tone-rose { --accent:#ff9ca0; --accent-rgb:255,156,160; }
.tone-red { --accent:#ff716b; --accent-rgb:255,113,107; }
.tone-mint { --accent:#70dfae; --accent-rgb:112,223,174; }
.tone-navy { --accent:#7eb5e7; --accent-rgb:126,181,231; }
.tone-yellow { --accent:#ffe35a; --accent-rgb:255,227,90; }
.tone-spectrum { --accent:#d39cff; --accent-rgb:211,156,255; }
.tone-teal { --accent:#73d6d6; --accent-rgb:115,214,214; }

.ambient { position: absolute; pointer-events: none; border-radius: 999px; filter: blur(2px); z-index: -1; }
.ambient-one { width: 38vw; height: 38vw; right: -18vw; top: 18vh; border: 1px solid rgba(var(--accent-rgb), .18); box-shadow: 0 0 100px rgba(var(--accent-rgb), .05); }
.ambient-two { width: 18vw; height: 18vw; left: -8vw; bottom: 8vh; background: rgba(var(--accent-rgb), .035); }

.topbar {
  height: 84px;
  padding: 0 clamp(22px, 4vw, 72px);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 6;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center; color: #101b22; background: var(--accent); box-shadow: 0 8px 30px rgba(var(--accent-rgb), .16); }
.brand > span:last-child { display: flex; flex-direction: column; line-height: 1.05; }
.brand strong { font-size: 13px; letter-spacing: .11em; }
.brand small { color: var(--muted); font-size: 12px; margin-top: 5px; }
.path-title { color: var(--muted); font-size: 13px; letter-spacing: .14em; text-transform: uppercase; }
.page-count { justify-self: end; display: flex; gap: 8px; align-items: baseline; font-size: 14px; color: var(--muted); font-variant-numeric: tabular-nums; }
.page-count span { color: var(--ink); font-size: 24px; font-weight: 700; }
.page-count i { color: var(--accent); font-style: normal; }
.progress-track { height: 3px; width: 100%; background: rgba(255,255,255,.04); position: relative; z-index: 6; }
.progress-track span { display: block; height: 100%; background: var(--accent); transition: width .55s cubic-bezier(.2,.8,.2,1); box-shadow: 0 0 18px rgba(var(--accent-rgb), .6); }

.slide {
  width: min(1500px, 100%);
  min-height: calc(100dvh - 170px);
  margin: 0 auto;
  padding: clamp(28px, 4vw, 68px) clamp(22px, 5vw, 84px) 106px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(350px, .85fr);
  align-items: center;
  gap: clamp(34px, 5vw, 90px);
  animation: slideIn .55s cubic-bezier(.2,.75,.25,1) both;
}
@keyframes slideIn { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.visual-column { min-width: 0; min-height: 480px; display: grid; place-items: center; }
.visual-column::before { content: ""; position: absolute; width: min(58vw, 820px); aspect-ratio: 1.45; border-radius: 44%; background: rgba(var(--accent-rgb), .035); filter: blur(35px); z-index: -1; }
.content-column { max-width: 520px; position: relative; z-index: 2; }
.eyebrow { margin: 0 0 17px; color: var(--accent); font-size: 12px; font-weight: 750; letter-spacing: .18em; text-transform: uppercase; }
.content-column h1 { margin: 0; max-width: 10em; font-size: clamp(38px, 4.45vw, 68px); line-height: .98; letter-spacing: -.045em; text-wrap: balance; }
.memory-card { margin-top: clamp(27px, 4vh, 46px); padding: 22px 24px 24px; border-left: 3px solid var(--accent); background: linear-gradient(100deg, rgba(var(--accent-rgb), .11), rgba(255,255,255,.025)); border-radius: 0 18px 18px 0; }
.memory-card span { color: var(--accent); font-size: 10px; font-weight: 800; letter-spacing: .2em; }
.memory-card p { margin: 9px 0 0; color: #eef8fd; font-size: clamp(18px, 1.55vw, 23px); line-height: 1.44; font-weight: 520; text-wrap: pretty; }
.fact-row { margin-top: 20px; display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.fact-row span { min-height: 43px; padding: 10px 14px; display: flex; align-items: center; gap: 13px; background: rgba(8,26,41,.82); color: #c4d8e4; font-size: 13px; }
.fact-row b { color: var(--accent); font-size: 10px; letter-spacing: .08em; }

.diagram { width: 100%; max-width: 840px; height: auto; overflow: visible; filter: drop-shadow(0 30px 38px rgba(0,0,0,.2)); }
.svgLabel { fill: #edf8fc; font-size: 15px; font-weight: 750; letter-spacing: .12em; }
.svgDarkLabel { fill: #4b3500; font-size: 14px; font-weight: 800; letter-spacing: .08em; }
.svgCaption { fill: #b9d0dc; font-size: 14px; font-weight: 600; }
.svgTiny { fill: #b9d0dc; font-size: 12px; }
.digitalText { fill: #62e0b4; font-size: 22px; font-family: monospace; font-weight: 700; }
.angleText { fill: white; font-size: 25px; font-style: italic; }

/* Ruhige Fachanimationen: Bewegung zeigt einen Vorgang, nicht bloß Dekoration. */
.earth-surface { transform-origin:500px 235px; animation:earthSpin 14s linear infinite; }
.rotation-arrow,.orbit-path { animation:dashFlow 7s linear infinite; }
.season-earth { animation:seasonFocus 9.6s ease-in-out infinite; }
.season-halo { fill:transparent; stroke:#ffd75a; stroke-width:3; opacity:0; }
.sun-pulse { transform-origin:380px 230px; animation:sunPulse 3.8s ease-in-out infinite; }
.thermometer-fill,.liquid-fill { transform-box:fill-box; transform-origin:center bottom; animation:liquidRise 5.5s ease-in-out infinite; }
.bimetal-needle { transform-origin:90px 130px; animation:needleSweep 5.5s ease-in-out infinite; }
.sensor-reading { animation:sensorBlink 3.2s ease-in-out infinite; }
.particle { transform-box:fill-box; transform-origin:center; }
.cold-particle { animation:coldJitter 2.4s ease-in-out infinite alternate; }
.warm-particle { animation:warmJitter 1.25s ease-in-out infinite alternate; }
.flow-arrow,.heat-flow,.heat-flow path,.light-rays path,.reflection-ray,.white-light,.spectrum-ray,.red-reflection,.eye-ray { stroke-dasharray:18 12; animation:dashFlow 2.7s linear infinite; }
.heat-convection { animation-duration:3.4s; }
.heat-radiation,.heat-radiation path { animation-duration:2.1s; }
.radiant-source,.lamp-glow { transform-box:fill-box; transform-origin:center; animation:radiantPulse 2.8s ease-in-out infinite; }
.light-field { animation:fieldBreathe 4.4s ease-in-out infinite; }
.shadow-space { animation:shadowBreathe 4.4s ease-in-out infinite; }
.reflection-ray { stroke-dasharray:620; stroke-dashoffset:620; animation:rayTravel 4.4s ease-in-out infinite; }
.outgoing-ray { animation-delay:1.35s; }
.white-light { stroke-dasharray:240; animation:dashFlow 2.4s linear infinite; }
.spectrum-ray { stroke-dasharray:290; stroke-dashoffset:290; animation:spectrumReveal 4.8s ease-in-out infinite; }
.red-reflection { stroke-dasharray:90; animation:dashFlow 1.8s linear infinite reverse; }

@keyframes earthSpin { to { transform:rotate(360deg); } }
@keyframes dashFlow { to { stroke-dashoffset:-120; } }
@keyframes seasonFocus { 0%,18% { filter:drop-shadow(0 0 13px #ffd75a); } 24%,100% { filter:none; } }
@keyframes sunPulse { 0%,100% { transform:scale(.94); opacity:.08; } 50% { transform:scale(1.12); opacity:.22; } }
@keyframes liquidRise { 0%,12% { transform:scaleY(.38); } 55%,68% { transform:scaleY(1); } 100% { transform:scaleY(.38); } }
@keyframes needleSweep { 0%,12% { transform:rotate(-28deg); } 55%,68% { transform:rotate(18deg); } 100% { transform:rotate(-28deg); } }
@keyframes sensorBlink { 0%,100% { opacity:.55; } 45%,70% { opacity:1; filter:drop-shadow(0 0 6px #62e0b4); } }
@keyframes coldJitter { from { transform:translate(-2px,1px); } to { transform:translate(2px,-1px); } }
@keyframes warmJitter { 0% { transform:translate(-8px,5px); } 35% { transform:translate(7px,-7px); } 70% { transform:translate(5px,8px); } 100% { transform:translate(-7px,-4px); } }
@keyframes radiantPulse { 0%,100% { transform:scale(.94); filter:drop-shadow(0 0 2px #ffd24f); } 50% { transform:scale(1.08); filter:drop-shadow(0 0 16px #ffd24f); } }
@keyframes fieldBreathe { 0%,100% { opacity:.55; } 50% { opacity:.9; } }
@keyframes shadowBreathe { 0%,100% { opacity:.78; } 50% { opacity:.98; } }
@keyframes rayTravel { 0% { stroke-dashoffset:620; opacity:0; } 18%,68% { opacity:1; } 82%,100% { stroke-dashoffset:0; opacity:0; } }
@keyframes spectrumReveal { 0%,10% { stroke-dashoffset:290; opacity:0; } 35%,76% { stroke-dashoffset:0; opacity:1; } 100% { stroke-dashoffset:0; opacity:.2; } }

.photo-visual { width: 100%; max-width: 880px; aspect-ratio: 1.48; position: relative; overflow: hidden; border-radius: clamp(24px,3vw,44px); border: 1px solid rgba(255,255,255,.14); box-shadow: 0 35px 80px rgba(0,0,0,.38); background: #0d2639; }
.photo-visual::after { content:""; position:absolute; inset:0; pointer-events:none; box-shadow: inset 0 0 0 1px rgba(255,255,255,.05), inset 0 -80px 100px rgba(5,18,28,.28); }
.photo-visual img { width:100%; height:100%; object-fit:cover; display:block; }
.hero-photo img { animation:heroDrift 15s ease-in-out infinite alternate; }
.energy-photo img { object-position:center; }
.energy-photo::before,.protection-photo::before { content:""; position:absolute; inset:-25%; z-index:1; pointer-events:none; background:linear-gradient(110deg,transparent 39%,rgba(255,220,96,.25) 49%,transparent 59%); transform:translateX(-52%); animation:sunSweep 7s ease-in-out infinite; }
.image-tags { position:absolute; left:20px; right:20px; bottom:18px; display:flex; justify-content:space-between; gap:8px; z-index:1; }
.image-tags span { padding:8px 12px; border:1px solid rgba(255,255,255,.24); border-radius:999px; background:rgba(4,18,28,.66); backdrop-filter:blur(12px); color:white; font-size:12px; font-weight:700; }
.image-tags span { animation:tagFocus 8s ease-in-out infinite; }.image-tags span:nth-child(2){animation-delay:2s}.image-tags span:nth-child(3){animation-delay:4s}.image-tags span:nth-child(4){animation-delay:6s}
.lens-inset { position:absolute; top:18px; right:18px; z-index:2; min-width:210px; padding:11px 14px; display:flex; align-items:center; gap:10px; border:1px solid rgba(255,255,255,.28); border-radius:16px; background:rgba(4,18,28,.72); backdrop-filter:blur(12px); color:#dbeaf0; font-size:11px; line-height:1.25; }
.lens-inset svg { width:82px; height:52px; fill:none; stroke:#ffd95d; stroke-width:2.2; stroke-linecap:round; }
.lens-inset b { color:#ffd95d; font-size:12px; }
.lens-inset svg path { stroke-dasharray:80; animation:dashFlow 2.5s linear infinite; }
@keyframes heroDrift { from { transform:scale(1); } to { transform:scale(1.035); } }
@keyframes sunSweep { 0%,18% { transform:translateX(-55%); opacity:0; } 45%,70% { opacity:1; } 88%,100% { transform:translateX(55%); opacity:0; } }
@keyframes tagFocus { 0%,16% { color:#14202a; background:var(--accent); transform:translateY(-4px); } 24%,100% { color:white; background:rgba(4,18,28,.66); transform:none; } }

.temperature-stage { width:100%; max-width:760px; min-height:480px; position:relative; display:grid; grid-template-columns:1fr 190px 1fr; align-items:center; gap:26px; }
.temperature-stage > svg { width:190px; height:480px; overflow:visible; filter:drop-shadow(0 22px 30px rgba(0,0,0,.3)); }
.temperature-context { min-height:180px; padding:27px 18px; border-radius:28px; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; border:1px solid rgba(255,255,255,.12); }
.temperature-context.cold { background:linear-gradient(160deg,rgba(44,164,231,.24),rgba(10,50,78,.55)); }
.temperature-context.hot { background:linear-gradient(160deg,rgba(255,109,80,.25),rgba(82,32,23,.55)); }
.temperature-context span { font-size:42px; }
.temperature-context strong { font-size:31px; margin-top:10px; }
.temperature-context small { color:#bad0dc; margin-top:8px; }
.micro-note { position:absolute; right:20px; bottom:40px; color:#8da8b8; font-size:11px; }

.three-panels { width:100%; max-width:820px; display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.instrument-card { min-height:440px; padding:20px 15px 24px; display:flex; flex-direction:column; align-items:center; justify-content:flex-end; border-radius:30px; border:1px solid rgba(255,255,255,.11); background:linear-gradient(160deg,rgba(var(--accent-rgb),.1),rgba(12,37,55,.72)); box-shadow:0 24px 50px rgba(0,0,0,.2); }
.instrument-card svg { width:100%; height:270px; }
.instrument-card strong { color:white; font-size:18px; }
.instrument-card span { margin-top:7px; color:#a9c3d0; font-size:12px; }

.eye-visual-v2 { width:100%; max-width:900px; aspect-ratio:1.777; position:relative; overflow:hidden; border:1px solid rgba(255,255,255,.15); border-radius:36px; background:#071729; box-shadow:0 35px 80px rgba(0,0,0,.4); }
.eye-visual-v2::after { content:""; position:absolute; inset:0; z-index:5; pointer-events:none; border-radius:inherit; box-shadow:inset 0 0 0 1px rgba(255,255,255,.05),inset 0 -75px 90px rgba(3,12,20,.3); }
.eye-visual-v2 > img { width:100%; height:100%; object-fit:cover; display:block; }
.eye-optics { position:absolute; inset:0; z-index:2; width:100%; height:100%; overflow:visible; }
.eye-ray { fill:none; stroke:#ffe36d; stroke-width:5; stroke-linecap:round; filter:url(#rayGlow); stroke-dasharray:1350; stroke-dashoffset:1350; animation:eyeRayTravel 5.2s ease-in-out infinite; }
.eye-ray-center { animation-delay:.16s; }.eye-ray-lower { animation-delay:.32s; }
.focus-point { fill:#fff8a8; transform-origin:1280px 470px; animation:focusPulse 5.2s ease-in-out infinite; filter:drop-shadow(0 0 13px #ffe36d); }
.eye-label { position:absolute; z-index:4; padding:7px 10px; border:1px solid rgba(255,255,255,.27); border-radius:10px; color:#f2fbff; background:rgba(4,18,29,.76); backdrop-filter:blur(9px); box-shadow:0 7px 18px rgba(0,0,0,.25); font-size:10px; font-weight:800; letter-spacing:.02em; }
.eye-cornea { left:2%; top:20%; }.eye-pupil { left:2%; top:47%; }.eye-lens { left:31%; top:7%; }.eye-retina { right:4%; top:17%; }.eye-nerve { right:3%; bottom:17%; }.eye-vitreous { left:59%; bottom:5%; }
.eye-key { position:absolute; left:12px; bottom:11px; z-index:4; display:flex; gap:8px; }
.eye-key span { padding:6px 9px; display:flex; align-items:center; gap:6px; border-radius:9px; color:#dcecf2; background:rgba(4,18,29,.76); font-size:8px; font-weight:750; }
.eye-key i { width:19px; height:3px; border-radius:3px; background:#ffe36d; box-shadow:0 0 6px #ffe36d; }.eye-key b { width:8px; height:8px; border-radius:50%; background:#fff8a8; box-shadow:0 0 7px #ffe36d; }
@keyframes eyeRayTravel { 0%,8% { stroke-dashoffset:1350; opacity:0; } 42%,76% { stroke-dashoffset:0; opacity:.95; } 100% { stroke-dashoffset:0; opacity:0; } }
@keyframes focusPulse { 0%,40%,100% { transform:scale(.45); opacity:.3; } 58%,78% { transform:scale(1.45); opacity:1; } }
.skin-visual-v2 { width:100%; max-width:900px; aspect-ratio:1.5; position:relative; overflow:hidden; border:1px solid rgba(255,255,255,.14); border-radius:36px; background:radial-gradient(circle at 52% 42%,#6b3529,#0a1118 72%); box-shadow:0 35px 80px rgba(0,0,0,.4); }
.skin-visual-v2::after { content:""; position:absolute; inset:0; pointer-events:none; border-radius:inherit; box-shadow:inset 0 0 0 1px rgba(255,255,255,.05),inset 0 -85px 95px rgba(4,14,22,.46); }
.skin-visual-v2 > img { width:100%; height:100%; object-fit:cover; display:block; }
.skin-layers { position:absolute; top:15%; right:2%; bottom:17%; z-index:3; width:148px; display:flex; flex-direction:column; justify-content:space-between; }
.skin-layers > span { padding:8px 10px 8px 25px; position:relative; border:1px solid rgba(255,255,255,.25); border-radius:12px; color:white; background:rgba(7,20,30,.78); backdrop-filter:blur(10px); font-size:12px; font-weight:800; box-shadow:0 9px 24px rgba(0,0,0,.22); }
.skin-layers i { position:absolute; left:10px; top:13px; width:8px; height:8px; border-radius:50%; background:#ffb195; box-shadow:0 0 10px currentColor; }
.skin-layers small { display:block; margin-top:3px; color:#a9c1cf; font-size:8px; font-weight:650; letter-spacing:.03em; }
.skin-layers .layer-dermis i { background:#db4f69; }
.skin-layers .layer-hypodermis i { background:#f4bd37; }
.skin-pin { position:absolute; z-index:4; width:29px; height:29px; display:grid; place-items:center; border:2px solid white; border-radius:50%; color:#15202a; background:var(--accent); font-size:11px; font-weight:900; box-shadow:0 7px 18px rgba(0,0,0,.38); }
.pin-sebum { left:42%; top:39%; }.pin-sweat { left:57%; top:58%; }.pin-touch { left:69%; top:69%; }.pin-vessel { left:48%; top:77%; }
.skin-legend { position:absolute; left:16px; right:16px; bottom:14px; z-index:3; min-height:46px; padding:8px 12px; display:grid; grid-template-columns:repeat(4,1fr); gap:9px; border:1px solid rgba(255,255,255,.19); border-radius:14px; background:rgba(5,17,26,.8); backdrop-filter:blur(12px); }
.skin-legend span { display:flex; align-items:center; gap:7px; color:#dceaf0; font-size:9px; font-weight:750; white-space:nowrap; }
.skin-legend b { width:21px; height:21px; display:grid; place-items:center; flex:0 0 auto; border-radius:50%; color:#16222a; background:var(--accent); font-size:9px; }

.hazard-grid { width:100%; max-width:820px; display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.hazard-card { min-height:350px; padding:34px 22px; border-radius:32px; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; border:1px solid rgba(255,255,255,.12); background:#102c41; box-shadow:0 28px 55px rgba(0,0,0,.22); }
.hazard-card.uv { background:linear-gradient(160deg,#5b3928,#261b1e); }
.hazard-card.cut { background:linear-gradient(160deg,#4b3042,#231b2b); }
.hazard-card.chemical { background:linear-gradient(160deg,#234c4d,#13272e); }
.hazard-icon { width:118px; height:118px; margin-bottom:28px; display:grid; place-items:center; border-radius:50%; color:var(--accent); background:rgba(255,255,255,.075); font-size:72px; line-height:1; }
.hazard-card strong { font-size:19px; }
.hazard-card span { margin-top:10px; color:#b8cbd5; font-size:12px; line-height:1.5; }

.controls { position:fixed; z-index:12; left:50%; bottom:20px; transform:translateX(-50%); width:min(770px,calc(100% - 28px)); height:66px; padding:8px; display:flex; justify-content:space-between; align-items:center; gap:14px; border:1px solid rgba(255,255,255,.14); border-radius:22px; background:rgba(7,22,34,.82); backdrop-filter:blur(20px); box-shadow:0 22px 55px rgba(0,0,0,.38); }
.control-group { display:flex; align-items:center; gap:6px; }
.icon-button,.text-control,.voice-control,.speed-control { height:48px; border:0; color:#d8e8ef; background:transparent; border-radius:15px; cursor:pointer; transition:background .2s,color .2s,transform .15s; }
.icon-button { width:48px; display:grid; place-items:center; }
.icon-button:hover,.text-control:hover,.voice-control:hover,.speed-control:hover { background:rgba(255,255,255,.08); color:white; }
.icon-button:active,.text-control:active,.voice-control:active,.speed-control:active { transform:scale(.96); }
.icon-button.active { color:#07141e; background:var(--accent); }
.icon-button svg { width:23px; height:23px; fill:none; stroke:currentColor; stroke-width:1.9; stroke-linecap:round; stroke-linejoin:round; }
.text-control { padding:0 13px; font-size:12px; font-weight:700; }
.voice-control { padding:0 13px; color:var(--accent); font-size:12px; font-weight:800; }
.speed-control { width:48px; font-size:12px; font-weight:800; color:var(--accent); }
.motion-paused *, .motion-paused *::before, .motion-paused *::after { animation-play-state:paused !important; }

.voice-menu { position:fixed; left:50%; bottom:102px; z-index:20; width:min(420px,calc(100% - 32px)); padding:20px; transform:translateX(-50%); border:1px solid rgba(255,255,255,.14); border-radius:22px; background:rgba(8,27,42,.97); backdrop-filter:blur(24px); box-shadow:0 24px 70px rgba(0,0,0,.45); animation:voiceRise .24s ease both; }
@keyframes voiceRise { from{opacity:0;transform:translate(-50%,10px)} to{opacity:1;transform:translate(-50%,0)} }
.voice-menu > div { display:flex; justify-content:space-between; align-items:center; margin-bottom:6px; }
.voice-menu > div span { color:var(--accent); font-size:11px; font-weight:800; letter-spacing:.13em; text-transform:uppercase; }
.voice-menu > div button { width:32px; height:32px; border:0; border-radius:50%; color:#dcecf3; background:rgba(255,255,255,.07); cursor:pointer; font-size:20px; }
.voice-menu > p { margin:6px 0 12px; color:#91acba; font-size:12px; }
.voice-menu > button:not(:first-child) { width:100%; min-height:42px; margin-top:5px; padding:8px 12px; display:flex; justify-content:space-between; align-items:center; border:1px solid transparent; border-radius:12px; color:#d8e8ef; background:rgba(255,255,255,.04); cursor:pointer; text-align:left; font-size:12px; }
.voice-menu > button.selected { border-color:rgba(var(--accent-rgb),.55); background:rgba(var(--accent-rgb),.1); color:white; }
.voice-menu > button b { color:var(--accent); font-size:9px; letter-spacing:.08em; text-transform:uppercase; }
.voice-menu > small { display:block; padding:12px; color:#ff9d91; }

.transcript { position:fixed; right:clamp(16px,4vw,54px); bottom:102px; z-index:20; width:min(510px,calc(100% - 32px)); padding:22px 24px; border:1px solid rgba(255,255,255,.14); border-radius:22px; background:rgba(8,27,42,.96); backdrop-filter:blur(24px); box-shadow:0 24px 70px rgba(0,0,0,.45); animation:slideIn .25s ease both; }
.transcript > div { display:flex; justify-content:space-between; align-items:center; }
.transcript span { color:var(--accent); font-size:11px; font-weight:800; letter-spacing:.13em; text-transform:uppercase; }
.transcript button { width:32px; height:32px; border:0; border-radius:50%; color:#dcecf3; background:rgba(255,255,255,.07); cursor:pointer; font-size:20px; }
.transcript p { margin:13px 0 0; color:#d7e7ed; font-size:15px; line-height:1.62; }
.transcript small { display:block; margin-top:12px; color:#ff9d91; }

.msl-intro { position:fixed; inset:0; z-index:50; display:grid; place-items:center; padding:20px; background:#06131f; transition:opacity .42s ease; }
.msl-intro.finishing { opacity:0; pointer-events:none; }
.msl-intro-card { position:relative; width:min(520px,calc(100vmin - 48px)); aspect-ratio:1; overflow:hidden; border:5px solid rgba(255,255,255,.98); border-radius:22px; background:#101a29; box-shadow:0 18px 55px rgba(0,0,0,.42); }
.msl-intro-video { display:block; width:100%; height:100%; object-fit:cover; background:#101a29; }
.msl-intro-start { position:absolute; left:50%; bottom:8%; z-index:3; min-width:48%; padding:11px 18px; border:3px solid white; border-radius:999px; color:white; background:rgba(0,91,218,.94); box-shadow:0 7px 24px rgba(0,0,0,.38); font:inherit; font-size:clamp(.85rem,1.7vw,1.2rem); font-weight:900; cursor:pointer; transform:translateX(-50%); transition:opacity .18s ease,transform .18s ease,background .18s ease; }
.msl-intro-start:hover,.msl-intro-start:focus-visible { background:#0758c7; transform:translateX(-50%) scale(1.04); }
.msl-intro.playing .msl-intro-start { opacity:0; pointer-events:none; }
.msl-intro-progress { position:absolute; right:0; bottom:0; left:0; z-index:4; height:7px; overflow:hidden; background:rgba(255,255,255,.25); }
.msl-intro-progress-bar { width:0; height:100%; background:#0c8ee7; box-shadow:0 0 10px rgba(255,255,255,.8); }
.msl-intro.counting .msl-intro-progress-bar { animation:introProgress 8s linear forwards; }
@keyframes introProgress { to { width:100%; } }

.start-screen { position:fixed; inset:0; z-index:30; display:grid; place-items:center; padding:20px; overflow:hidden; background:#06131f; }
.start-screen::before { content:""; position:absolute; inset:-20px; z-index:-2; background:linear-gradient(90deg,rgba(4,15,24,.84),rgba(4,15,24,.36)),url('./sun-earth-hero.png') center/cover no-repeat; filter:saturate(.9); }
.start-screen::after { content:""; position:absolute; inset:0; z-index:-1; background:radial-gradient(circle at 50% 35%,rgba(255,211,77,.12),transparent 38%); }
.start-card { width:min(640px,100%); padding:48px 34px 38px; display:flex; flex-direction:column; align-items:center; text-align:center; border:1px solid rgba(255,255,255,.13); border-radius:38px; background:linear-gradient(145deg,rgba(18,49,70,.96),rgba(8,26,41,.96)); box-shadow:0 38px 110px rgba(0,0,0,.5); animation:startRise .7s cubic-bezier(.2,.8,.2,1) both; }
@keyframes startRise { from{opacity:0;transform:translateY(22px) scale(.98)} to{opacity:1;transform:none} }
.start-sun { width:106px; height:106px; display:grid; place-items:center; border-radius:34px; color:#182129; background:#ffd456; box-shadow:0 0 0 12px rgba(255,212,86,.06),0 22px 55px rgba(255,200,45,.18); }
.start-card > p { margin:30px 0 12px; color:#ffd456; font-size:11px; font-weight:800; letter-spacing:.2em; }
.start-card h2 { margin:0; font-size:clamp(48px,7vw,76px); line-height:.94; letter-spacing:-.055em; }
.start-note { margin-top:22px; color:#acc3cf; font-size:14px; }
.start-card > button { margin-top:34px; height:60px; padding:0 24px 0 27px; display:flex; align-items:center; gap:16px; border:0; border-radius:18px; color:#13202a; background:#ffd456; font-weight:800; cursor:pointer; box-shadow:0 16px 35px rgba(255,200,50,.16); }
.start-card > button svg { width:23px; height:23px; fill:none; stroke:currentColor; stroke-width:2; stroke-linejoin:round; }
.start-card > small { margin-top:19px; color:#7793a4; font-size:11px; }

@media (max-width: 980px) {
  .slide { grid-template-columns:1fr; gap:22px; padding-top:30px; padding-bottom:112px; align-items:start; }
  .visual-column { min-height:unset; order:1; }
  .content-column { order:2; max-width:none; display:grid; grid-template-columns:1fr 1fr; gap:14px 24px; align-items:start; }
  .eyebrow,.content-column h1 { grid-column:1; }
  .content-column h1 { font-size:clamp(34px,6vw,58px); }
  .memory-card { grid-column:2; grid-row:1 / span 2; margin-top:0; }
  .fact-row { grid-column:1 / -1; grid-template-columns:repeat(3,1fr); }
  .photo-visual { max-width:750px; }
  .diagram { max-height:45vh; }
  .visual-column::before { width:82vw; }
}

@media (max-width: 680px) {
  .topbar { height:66px; padding:0 16px; grid-template-columns:1fr auto; }
  .brand-mark { width:36px;height:36px;border-radius:12px; }
  .brand small,.path-title { display:none; }
  .page-count span { font-size:19px; }
  .slide { min-height:calc(100dvh - 69px); padding:18px 16px 104px; }
  .content-column { display:block; }
  .eyebrow { margin:18px 0 9px; }
  .content-column h1 { font-size:36px; line-height:1.02; }
  .memory-card { margin-top:18px; padding:16px 17px; }
  .memory-card p { font-size:17px; }
  .fact-row { display:none; }
  .visual-column { min-height:250px; }
  .photo-visual { border-radius:24px; aspect-ratio:1.3; }
  .diagram { max-height:39vh; }
  .skin-visual-v2 { aspect-ratio:1.27; border-radius:23px; }
  .eye-visual-v2 { aspect-ratio:1.38; border-radius:23px; }
  .eye-visual-v2 > img { object-position:center; }
  .eye-label { padding:5px 6px; border-radius:7px; font-size:7px; }
  .eye-key { display:none; }
  .skin-layers { width:104px; top:11%; bottom:18%; }
  .skin-layers > span { padding:6px 6px 6px 18px; border-radius:8px; font-size:9px; }
  .skin-layers i { left:6px; top:9px; width:7px; height:7px; }
  .skin-layers small { display:none; }
  .skin-pin { width:22px; height:22px; font-size:8px; }
  .skin-legend { left:7px; right:7px; bottom:7px; min-height:34px; padding:5px; gap:3px; }
  .skin-legend span { gap:3px; font-size:7px; }
  .skin-legend b { width:16px; height:16px; font-size:7px; }
  .three-panels,.hazard-grid { grid-template-columns:repeat(3,1fr); gap:6px; }
  .instrument-card,.hazard-card { min-height:245px; padding:10px 5px 16px; border-radius:17px; }
  .instrument-card svg { height:180px; }
  .instrument-card strong,.hazard-card strong { font-size:12px; }
  .instrument-card span,.hazard-card span { display:none; }
  .hazard-icon { width:70px;height:70px;margin-bottom:18px;font-size:40px; }
  .temperature-stage { min-height:330px; grid-template-columns:1fr 110px 1fr; gap:7px; }
  .temperature-stage > svg { width:110px;height:330px; }
  .temperature-context { min-height:130px;padding:12px 4px;border-radius:18px; }
  .temperature-context span { font-size:24px; }.temperature-context strong{font-size:18px}.temperature-context small{font-size:9px}
  .micro-note { display:none; }
  .controls { bottom:10px; height:60px; border-radius:19px; }
  .icon-button,.text-control,.voice-control,.speed-control { height:44px; }
  .icon-button { width:44px; }
  .text-control { display:none; }
  .voice-control { padding:0 9px; }
  .msl-intro-card { width:min(92vw,390px); border-width:3px; border-radius:14px; }
  .start-card { padding:36px 22px 30px;border-radius:28px; }
  .start-sun { width:84px;height:84px;border-radius:27px; }
  .start-card h2 { font-size:51px; }
  .start-note { font-size:12px; }
  .image-tags { display:none; }
  .lens-inset { min-width:0; padding:7px 9px; top:9px; right:9px; }
  .lens-inset svg { width:54px; height:35px; }
  .lens-inset span { display:none; }
}

@media (prefers-reduced-motion: reduce) {
  *,*::before,*::after { animation-duration:.01ms !important; transition-duration:.01ms !important; scroll-behavior:auto !important; }
}