:root {
    /* Fraunces titles; Noto Sans KR Korean; IBM Plex Mono only for formulas; Space Grotesk for body copy and interface labels; Groteskk Grotesk* Grotesk** */
    --mint: #85F0C5;
    --cyan: #A7F3FF;
    --navy: #07111F;
    --brass: #C6A15B;
    --coral: #FF6B5F;
    --violet: #33235C;
    --cream: #F2E9D2;
    --display: 'Fraunces', serif;
    --kr: 'Noto Sans KR', sans-serif;
    --body: 'Space Grotesk', sans-serif;
    --mono: 'IBM Plex Mono', monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    overflow-x: hidden;
    color: var(--cream);
    background:
        radial-gradient(circle at 74% 18%, rgba(167, 243, 255, 0.13), transparent 24rem),
        radial-gradient(circle at 16% 76%, rgba(133, 240, 197, 0.12), transparent 28rem),
        linear-gradient(135deg, var(--navy) 0%, #0A1325 42%, var(--violet) 100%);
    font-family: var(--body);
}

#particle-field {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.8;
}

.probability-beam {
    position: fixed;
    left: -16vw;
    bottom: 4vh;
    width: 140vw;
    height: 2px;
    z-index: 2;
    pointer-events: none;
    transform: rotate(-29deg);
    transform-origin: left center;
    background: linear-gradient(90deg, transparent, rgba(133, 240, 197, 0.25), var(--cyan), rgba(198, 161, 91, 0.45), transparent);
    box-shadow: 0 0 18px rgba(167, 243, 255, 0.55), 0 0 50px rgba(133, 240, 197, 0.28);
}

.cursor-orbit {
    position: fixed;
    width: 9rem;
    height: 9rem;
    margin: -4.5rem 0 0 -4.5rem;
    border: 1px solid rgba(167, 243, 255, 0.16);
    border-radius: 50%;
    z-index: 3;
    pointer-events: none;
    transform: translate3d(50vw, 50vh, 0);
    background: radial-gradient(circle, rgba(133, 240, 197, 0.13), transparent 65%);
    filter: blur(0.5px);
}

.experiment-nav {
    position: fixed;
    right: 2.2rem;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
    z-index: 20;
    font-family: var(--mono);
    text-transform: uppercase;
    font-size: 0.62rem;
    letter-spacing: 0.12em;
}

.nav-dot {
    width: 0.82rem;
    height: 0.82rem;
    border: 1px solid rgba(242, 233, 210, 0.45);
    border-radius: 50%;
    color: var(--cream);
    text-decoration: none;
    position: relative;
    background: rgba(7, 17, 31, 0.54);
    transition: background 0.35s ease, border-color 0.35s ease, transform 0.35s ease;
}

.nav-dot span {
    position: absolute;
    right: 1.4rem;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    white-space: nowrap;
    transition: opacity 0.35s ease, color 0.35s ease;
}

.nav-dot:hover span, .nav-dot.active span { opacity: 1; color: var(--cyan); }
.nav-dot.active { background: var(--coral); border-color: var(--coral); transform: scale(1.28); box-shadow: 0 0 22px rgba(255, 107, 95, 0.7); }

.chance-scene {
    min-height: 100vh;
    position: relative;
    z-index: 1;
    overflow: hidden;
    padding: clamp(3rem, 6vw, 7rem);
    isolation: isolate;
}

.chance-scene::before {
    content: '';
    position: absolute;
    inset: 1.1rem;
    border: 1px solid rgba(242, 233, 210, 0.08);
    border-radius: 2rem;
    pointer-events: none;
}

.formula-tag {
    display: inline-flex;
    width: max-content;
    max-width: 88vw;
    padding: 0.42rem 0.62rem;
    border: 1px solid rgba(167, 243, 255, 0.22);
    border-radius: 999px;
    color: rgba(242, 233, 210, 0.82);
    background: rgba(7, 17, 31, 0.46);
    font-family: var(--mono);
    font-size: clamp(0.62rem, 1.1vw, 0.82rem);
    letter-spacing: 0.05em;
    backdrop-filter: blur(9px);
}

.prior-scene {
    display: grid;
    align-items: center;
    background: radial-gradient(circle at 54% 46%, rgba(51, 35, 92, 0.38), transparent 32rem);
}

.fog-layer {
    position: absolute;
    inset: -20%;
    opacity: 0.48;
    filter: blur(34px);
    background:
        radial-gradient(circle at 24% 46%, rgba(167, 243, 255, 0.16), transparent 26rem),
        radial-gradient(circle at 68% 40%, rgba(242, 233, 210, 0.12), transparent 20rem),
        radial-gradient(circle at 48% 72%, rgba(133, 240, 197, 0.11), transparent 28rem);
    animation: fogDrift 18s ease-in-out infinite alternate;
}

.fog-b { animation-duration: 24s; animation-direction: alternate-reverse; opacity: 0.34; }

.title-cluster {
    margin-left: 7vw;
    max-width: 62rem;
    transform: rotate(-3deg);
}

.korean-stamp {
    font-family: var(--kr);
    color: var(--mint);
    font-weight: 700;
    letter-spacing: 0.24em;
    text-transform: uppercase;
}

h1 {
    margin: -0.2rem 0 0;
    font-family: var(--display);
    font-size: clamp(8rem, 22vw, 23rem);
    line-height: 0.82;
    font-weight: 900;
    font-variation-settings: 'SOFT' 100, 'WONK' 1;
    color: rgba(242, 233, 210, 0.94);
    text-shadow: 0 0 28px rgba(167, 243, 255, 0.28), 0 0 90px rgba(133, 240, 197, 0.12);
    animation: emerge 2.8s cubic-bezier(.2,.8,.2,1) both;
}

.title-cluster p {
    width: min(34rem, 86vw);
    margin-left: clamp(1rem, 12vw, 13rem);
    color: rgba(242, 233, 210, 0.72);
    font-size: clamp(1rem, 1.6vw, 1.35rem);
    line-height: 1.65;
}

.scene-label { position: absolute; left: 8vw; top: 10vh; }
.marginal-note { position: absolute; right: 10vw; bottom: 16vh; transform: rotate(4deg); }

.bead-field { position: absolute; inset: 0; pointer-events: none; }
.sample-bead, .marble {
    position: absolute;
    width: var(--size, 1rem);
    height: var(--size, 1rem);
    border-radius: 50%;
    transform: translate3d(var(--x, 50vw), var(--y, 50vh), 0);
    box-shadow: 0 0 18px currentColor;
    animation: beadDrift var(--dur, 8s) ease-in-out infinite alternate;
}
.sample-bead:nth-child(1){--x:18vw;--y:34vh;--size:1.1rem;--dur:9s}.sample-bead:nth-child(2){--x:76vw;--y:28vh;--size:.8rem;--dur:11s}.sample-bead:nth-child(3){--x:58vw;--y:72vh;--size:1.3rem;--dur:10s}.sample-bead:nth-child(4){--x:32vw;--y:78vh;--size:.65rem;--dur:7s}.sample-bead:nth-child(5){--x:83vw;--y:64vh;--size:.95rem;--dur:12s}.sample-bead:nth-child(6){--x:10vw;--y:62vh;--size:.75rem;--dur:8.5s}.sample-bead:nth-child(7){--x:48vw;--y:18vh;--size:.5rem;--dur:9.5s}.sample-bead:nth-child(8){--x:68vw;--y:45vh;--size:.72rem;--dur:13s}
.bead-cyan { color: var(--cyan); background: var(--cyan); }.bead-mint { color: var(--mint); background: var(--mint); }.bead-brass { color: var(--brass); background: var(--brass); }.bead-cream { color: var(--cream); background: var(--cream); }.bead-coral { color: var(--coral); background: var(--coral); }
.small { opacity: 0.78; }.tiny { opacity: 0.68; }

.fortune-strip {
    position: absolute;
    padding: 1.1rem 0.8rem;
    writing-mode: vertical-rl;
    font-family: var(--kr);
    color: var(--violet);
    background: linear-gradient(180deg, var(--cream), rgba(242, 233, 210, 0.76));
    box-shadow: 0 18px 40px rgba(0,0,0,0.28);
    letter-spacing: 0.12em;
}
.strip-one { right: 18vw; top: 18vh; transform: rotate(8deg); }.strip-two { left: 11vw; bottom: 9vh; transform: rotate(-10deg); }

.scene-heading { position: absolute; z-index: 4; max-width: 34rem; }
.off-left { left: 7vw; top: 12vh; }.off-right { right: 8vw; top: 14vh; text-align: right; }.lower { top: auto; bottom: 11vh; }
.scene-number { font-family: var(--mono); color: var(--brass); letter-spacing: 0.22em; }
h2 {
    margin: 0.2rem 0;
    font-family: var(--display);
    font-size: clamp(3.6rem, 9vw, 9rem);
    line-height: 0.92;
    color: var(--cream);
    font-weight: 820;
    font-variation-settings: 'SOFT' 90, 'WONK' 1;
}
.kr-line { font-family: var(--kr); color: rgba(167, 243, 255, 0.78); font-size: clamp(1rem, 1.7vw, 1.45rem); }

.experiment-plate {
    position: absolute;
    border: 1px solid rgba(167, 243, 255, 0.17);
    border-radius: 3rem;
    background: linear-gradient(145deg, rgba(242, 233, 210, 0.07), rgba(7, 17, 31, 0.32));
    box-shadow: inset 0 0 60px rgba(167, 243, 255, 0.06), 0 30px 80px rgba(0,0,0,0.3);
    backdrop-filter: blur(8px);
}
.urn-plate { right: 9vw; bottom: 10vh; width: min(43rem, 82vw); height: 58vh; transform: rotate(3deg); }
.transparent-urn { position: absolute; left: 21%; bottom: 13%; width: 46%; height: 74%; }
.urn-neck { position: absolute; left: 35%; top: 0; width: 30%; height: 25%; border: 2px solid rgba(167,243,255,.55); border-bottom: none; border-radius: 2rem 2rem 0 0; }
.urn-glass { position: absolute; left: 5%; bottom: 0; width: 90%; height: 82%; border: 2px solid rgba(167,243,255,.45); border-radius: 22% 22% 44% 44%; background: radial-gradient(circle at 44% 74%, rgba(167,243,255,.14), transparent 55%); }
.marble { --size: 1.35rem; color: var(--mint); background: currentColor; animation: marbleQuiver 2.4s ease-in-out infinite alternate; }
.m1{left:24%;top:60%;color:var(--mint)}.m2{left:40%;top:70%;color:var(--cyan)}.m3{left:54%;top:62%;color:var(--brass)}.m4{left:31%;top:78%;color:var(--cream)}.m5{left:61%;top:76%;color:var(--coral)}.m6{left:46%;top:52%;color:var(--mint)}.released{left:78%;top:16%;color:var(--cyan);animation:releaseMarble 4.5s ease-in-out infinite}
.specimen-tags { position: absolute; right: 4%; top: 11%; display: grid; gap: 0.7rem; }
.galton-lines { position: absolute; left: 3vw; bottom: 4vh; width: min(52rem, 70vw); height: auto; opacity: 0.8; }
.galton-lines path { fill: none; stroke: rgba(242,233,210,.46); stroke-width: 2; stroke-dasharray: 8 10; animation: dash 7s linear infinite; }
.galton-lines .delay { stroke: rgba(133,240,197,.38); animation-delay: -2s; }
.galton-lines circle { fill: var(--brass); opacity: .78; }

.branch-tree { position: absolute; left: 9vw; top: 20vh; width: 72vw; height: 62vh; }
.branch-node {
    position: absolute;
    min-width: 5.4rem;
    padding: 0.85rem 1rem;
    border: 1px solid rgba(133, 240, 197, 0.45);
    border-radius: 50%;
    color: var(--cream);
    background: rgba(7,17,31,.64);
    font-family: var(--mono);
    text-align: center;
    box-shadow: 0 0 24px rgba(133,240,197,.12);
    transition: transform 0.45s ease, border-color 0.45s ease, background 0.45s ease;
}
.branch-tree.perturbed .branch-node { transform: translateX(var(--push, 0)) translateY(var(--lift, 0)) scale(1.04); border-color: var(--coral); }
.root{left:3%;top:43%;--push:-.2rem}.n1{left:25%;top:18%;--push:1rem;--lift:-.4rem}.n2{left:26%;top:66%;--push:.5rem;--lift:.6rem}.n3{left:50%;top:8%;--push:1.5rem}.n4{left:52%;top:36%;--push:2.1rem;--lift:.3rem}.n5{left:74%;top:18%;--push:2.8rem;--lift:-.5rem}.n6{left:76%;top:62%;--push:2.2rem;--lift:.8rem}
.branch-line { position:absolute; height:1px; background:linear-gradient(90deg,rgba(167,243,255,.12),rgba(167,243,255,.75),rgba(198,161,91,.2)); transform-origin:left center; }
.l1{left:10%;top:48%;width:21%;transform:rotate(-28deg)}.l2{left:10%;top:51%;width:22%;transform:rotate(28deg)}.l3{left:33%;top:25%;width:22%;transform:rotate(-18deg)}.l4{left:33%;top:72%;width:24%;transform:rotate(-39deg)}.l5{left:59%;top:16%;width:20%;transform:rotate(12deg)}.l6{left:59%;top:45%;width:21%;transform:rotate(31deg)}
.chalk-equations { position: absolute; left: 7vw; bottom: 12vh; display: grid; gap: .9rem; font-family: var(--mono); color: rgba(242,233,210,.56); transform: rotate(-2deg); }
.chalk-equations span { filter: blur(.15px); text-shadow: 0 0 12px rgba(242,233,210,.18); }

.moon-system { position: absolute; inset: 4vh 6vw; }
.distribution-moon {
    position: absolute;
    right: 14vw;
    top: 10vh;
    width: clamp(10rem, 22vw, 22rem);
    height: clamp(10rem, 22vw, 22rem);
    border-radius: 50%;
    background: radial-gradient(circle at 38% 32%, var(--cream), var(--cyan) 34%, rgba(167,243,255,.28) 58%, transparent 70%);
    box-shadow: 0 0 50px rgba(167,243,255,.58), 0 0 110px rgba(133,240,197,.2);
    animation: moonCross 14s ease-in-out infinite alternate;
}
.distribution-veil { position: absolute; left: 0; right: 0; bottom: 10vh; width: 100%; height: 54vh; overflow: visible; }
.curve { fill: none; stroke-linecap: round; stroke-width: 5; filter: drop-shadow(0 0 14px rgba(167,243,255,.26)); }
.curve-main { stroke: var(--cyan); animation: breatheCurve 6s ease-in-out infinite; }
.curve-alt { stroke: rgba(133,240,197,.5); stroke-width: 3; animation: breatheCurve 7s ease-in-out infinite reverse; }
.curve-tail { stroke: rgba(255,107,95,.68); stroke-width: 3; stroke-dasharray: 10 14; animation: dash 8s linear infinite; }
.density-readout { position: absolute; right: 8vw; bottom: 14vh; }
.venn-shadow { position:absolute; width:18rem; height:18rem; border-radius:50%; mix-blend-mode:screen; filter:blur(1px); opacity:.28; }
.v1{left:16vw;top:18vh;background:rgba(133,240,197,.38)}.v2{left:26vw;top:24vh;background:rgba(167,243,255,.32)}

.final-heading { left: 8vw; top: 8vh; max-width: 48rem; }
.collapse-stage { position: absolute; inset: 20vh 8vw 10vh 8vw; border-radius: 50%; }
.possible-ending {
    position: absolute;
    padding: 1rem 1.2rem;
    border: 1px solid rgba(242,233,210,.17);
    border-radius: 1.2rem;
    color: rgba(242,233,210,.68);
    font-family: var(--mono);
    background: rgba(51,35,92,.32);
    animation: endingHover 4s ease-in-out infinite alternate;
    transition: opacity .8s ease, transform .8s ease, filter .8s ease;
}
.e1{left:18%;top:32%;animation-delay:-1s}.e2{right:24%;top:20%;animation-delay:-2s}.e3{left:42%;bottom:20%;animation-delay:-3s}.e4{right:12%;bottom:32%;animation-delay:-.5s}
.collapse-mark {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 2rem;
    height: 2rem;
    margin: -1rem 0 0 -1rem;
    border-radius: 50%;
    background: var(--coral);
    box-shadow: 0 0 26px rgba(255,107,95,.9), 0 0 90px rgba(255,107,95,.46);
    transform: scale(0.55);
    animation: coralPulse 1.8s ease-in-out infinite;
}
.collapse-stage.resolved .possible-ending { opacity: .14; transform: scale(.82); filter: blur(3px); }
.collapse-stage.resolved .collapse-mark { animation: collapseSnap .7s cubic-bezier(.2,1.4,.2,1) both, coralPulse 1.8s ease-in-out .7s infinite; }
.observed-label { position: absolute; left: 54%; top: 56%; border-color: rgba(255,107,95,.44); }
.closing-line { position: absolute; left: 8vw; bottom: 9vh; display: grid; gap: .35rem; }
.closing-line span { font-family: var(--mono); color: var(--brass); letter-spacing: .14em; }
.closing-line strong { font-family: var(--display); font-size: clamp(2rem,5vw,5.2rem); color: var(--cream); font-weight: 760; }

@keyframes fogDrift { from { transform: translate3d(-3%, -2%, 0) scale(1); } to { transform: translate3d(4%, 3%, 0) scale(1.08); } }
@keyframes emerge { from { opacity: 0; filter: blur(28px); transform: translateY(4rem) scale(.94); } to { opacity: 1; filter: blur(0); transform: translateY(0) scale(1); } }
@keyframes beadDrift { from { margin-left: -1.8rem; margin-top: .7rem; filter: blur(.2px); } to { margin-left: 2.1rem; margin-top: -1.4rem; filter: blur(1px); } }
@keyframes marbleQuiver { to { transform: translate3d(var(--x, 0), var(--y, 0), 0) scale(1.08); } }
@keyframes releaseMarble { 0% { transform: translate(0,0) scale(.8); opacity:.2 } 28% { opacity:1 } 65% { transform: translate(8rem, 6rem) scale(1); } 100% { transform: translate(13rem, 13rem) scale(.5); opacity:.1 } }
@keyframes dash { to { stroke-dashoffset: -120; } }
@keyframes moonCross { from { transform: translate(-8vw, 2vh) scale(.95); } to { transform: translate(5vw, -4vh) scale(1.07); } }
@keyframes breatheCurve { 0%,100% { transform: scaleY(1); transform-origin: 50% 85%; opacity:.75; } 50% { transform: scaleY(1.12); opacity:1; } }
@keyframes endingHover { to { margin-top: -1.2rem; transform: rotate(2deg); } }
@keyframes coralPulse { 50% { transform: scale(.82); box-shadow: 0 0 42px rgba(255,107,95,1), 0 0 130px rgba(255,107,95,.58); } }
@keyframes collapseSnap { from { transform: scale(.4); } to { transform: scale(3.2); } }

@media (max-width: 760px) {
    .chance-scene { padding: 2.2rem; }
    .experiment-nav { right: 1rem; }
    .nav-dot span { display: none; }
    .title-cluster { margin-left: 0; }
    .title-cluster p { margin-left: 0; }
    .urn-plate { right: 4vw; width: 88vw; }
    .branch-tree { left: 2vw; width: 92vw; transform: scale(.82); transform-origin: left center; }
    .galton-lines { width: 94vw; }
    .observed-label { left: 20%; top: 66%; }
}