:root {
    --deep-rain-black: #05070B;
    --wet-slate-blue: #182A3A;
    --glass-cyan: #7DE7FF;
    --ceramic-mist: #EAF4F1;
    --probability-violet: #8D6CFF;
    --rare-event-lightning: #F9FF6A;
    --red-misread-warning-ink: #FF4D5E;
    --pool-shadow-green: #164A45;
    --song: 'Song Myung', serif;
    --serif: 'DM Serif Display', serif;
    --sans-kr: 'IBM Plex Sans KR', sans-serif;
    --mono: 'Spline Sans Mono', monospace;
    --design-font-token-kr-stars: 'KR**';
}

* { box-sizing: border-box; }

html {
    min-height: 100%;
    background: var(--deep-rain-black);
}

body {
    margin: 0;
    min-height: 100%;
    color: var(--ceramic-mist);
    font-family: var(--sans-kr);
    background:
        radial-gradient(circle at 66% 16%, rgba(125, 231, 255, 0.16), transparent 28vw),
        radial-gradient(circle at 12% 76%, rgba(141, 108, 255, 0.13), transparent 30vw),
        linear-gradient(180deg, var(--deep-rain-black) 0%, #09111a 42%, var(--wet-slate-blue) 100%);
    overflow-x: hidden;
}

body.disturbed .droplet { animation-play-state: running; }
body.disturbed .rivulet { animation-play-state: running; }
body.disturbed .listen-line { opacity: 0.18; transform: translateY(18px); }

.rainhouse {
    position: relative;
    min-height: 500vh;
    isolation: isolate;
}

.fixed-atmosphere {
    position: fixed;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.caustics {
    position: absolute;
    inset: -10%;
    background:
        repeating-linear-gradient(118deg, transparent 0 34px, rgba(125, 231, 255, 0.045) 35px 38px, transparent 39px 86px),
        repeating-linear-gradient(73deg, transparent 0 52px, rgba(234, 244, 241, 0.035) 53px 55px, transparent 56px 120px);
    filter: blur(0.6px);
    opacity: 0.7;
    animation: waterLight 18s ease-in-out infinite alternate;
}

.fog {
    position: absolute;
    width: 78vw;
    height: 52vh;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(234, 244, 241, 0.14), rgba(125, 231, 255, 0.055) 42%, transparent 72%);
    filter: blur(34px);
    mix-blend-mode: screen;
}

.fog-one { left: -22vw; top: 6vh; animation: fogDrift 28s ease-in-out infinite alternate; }
.fog-two { right: -24vw; bottom: 2vh; animation: fogDrift 31s ease-in-out infinite alternate-reverse; }

.hangul-shadow {
    position: absolute;
    font-family: var(--song);
    font-size: clamp(20rem, 46vw, 62rem);
    line-height: 0.8;
    color: rgba(234, 244, 241, 0.06);
    text-shadow: 0 0 42px rgba(125, 231, 255, 0.11), 0 24px 80px rgba(5, 7, 11, 0.8);
    transform: rotate(-8deg);
    user-select: none;
}

.hangul-left { left: -9vw; top: 10vh; }
.hangul-right { right: -9vw; bottom: 5vh; transform: rotate(7deg); }

.rain-cylinder {
    position: absolute;
    left: 46%;
    top: -8vh;
    width: min(31vw, 420px);
    height: 116vh;
    transform: translateX(-50%);
}

.cylinder-glass {
    position: absolute;
    inset: 0 11%;
    border-left: 1px solid rgba(125, 231, 255, 0.32);
    border-right: 1px solid rgba(125, 231, 255, 0.22);
    border-radius: 48% / 3%;
    background:
        linear-gradient(90deg, transparent 0%, rgba(234, 244, 241, 0.055) 24%, rgba(125, 231, 255, 0.1) 48%, rgba(141, 108, 255, 0.075) 64%, transparent 100%),
        linear-gradient(180deg, rgba(125, 231, 255, 0.12), rgba(22, 74, 69, 0.1));
    box-shadow: inset 0 0 42px rgba(125, 231, 255, 0.14), 0 0 70px rgba(125, 231, 255, 0.07);
    backdrop-filter: blur(3px);
}

.measurement-marks {
    position: absolute;
    inset: 11vh 17% 9vh auto;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    color: rgba(234, 244, 241, 0.48);
}

.measurement-marks span::before {
    content: '';
    display: inline-block;
    width: 26px;
    height: 1px;
    margin-right: 8px;
    vertical-align: middle;
    background: rgba(125, 231, 255, 0.4);
}

.rivulet-map {
    position: absolute;
    inset: 5vh 4% 3vh;
    width: 92%;
    height: 108vh;
    overflow: visible;
}

.rivulet, .gate-path {
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.rivulet {
    stroke: var(--glass-cyan);
    stroke-width: 3;
    filter: drop-shadow(0 0 8px rgba(125, 231, 255, 0.75));
    stroke-dasharray: 1280;
    stroke-dashoffset: 1280;
    animation: drawRivulet 7s ease-in-out infinite;
    animation-play-state: paused;
}

.branch-a { stroke: var(--probability-violet); animation-delay: 1.2s; }
.branch-b { stroke: var(--ceramic-mist); animation-delay: 2.1s; opacity: 0.76; }
.branch-c { stroke: var(--pool-shadow-green); animation-delay: 3s; }
.gate-path { stroke: rgba(249, 255, 106, 0.4); stroke-width: 2; stroke-dasharray: 8 13; }

.sluice {
    position: absolute;
    left: 20%;
    width: 62%;
    height: 34px;
    border: 1px solid rgba(249, 255, 106, 0.44);
    background: linear-gradient(90deg, rgba(249, 255, 106, 0.06), rgba(125, 231, 255, 0.08));
    transform: rotate(-11deg);
    box-shadow: 0 0 22px rgba(249, 255, 106, 0.12);
}

.sluice span {
    position: absolute;
    right: 10px;
    top: -20px;
    font: 500 0.65rem var(--mono);
    color: var(--rare-event-lightning);
}

.gate-one { top: 31vh; }
.gate-two { top: 57vh; transform: rotate(-16deg); }

.droplet-field {
    position: absolute;
    inset: 0;
    transform: translate(var(--bend-x, 0px), var(--bend-y, 0px));
    transition: transform 0.45s ease-out;
}

.droplet {
    position: absolute;
    left: var(--x);
    top: -8vh;
    width: var(--size);
    height: calc(var(--size) * 1.45);
    border-radius: 58% 58% 62% 62% / 48% 48% 74% 74%;
    background: radial-gradient(circle at 35% 24%, var(--ceramic-mist), rgba(125, 231, 255, 0.78) 30%, rgba(141, 108, 255, 0.28) 64%, rgba(22, 74, 69, 0.18));
    box-shadow: 0 0 16px rgba(125, 231, 255, 0.56), inset -4px -8px 14px rgba(5, 7, 11, 0.45);
    opacity: 0.82;
    animation: dropletFall var(--dur) cubic-bezier(0.36, 0.02, 0.32, 1) infinite;
    animation-delay: var(--delay);
    animation-play-state: paused;
}

.droplet::after {
    content: attr(data-p);
    position: absolute;
    left: 130%;
    top: 18%;
    font: 500 0.55rem var(--mono);
    color: rgba(234, 244, 241, 0.52);
    white-space: nowrap;
}

.rare-lightning {
    position: absolute;
    inset: 0;
    opacity: 0;
    background:
        linear-gradient(116deg, transparent 0 46%, rgba(249, 255, 106, 0.9) 46.3% 46.9%, transparent 47.2% 54%, rgba(249, 255, 106, 0.42) 54.4% 54.8%, transparent 55.2%),
        radial-gradient(circle at 54% 48%, rgba(249, 255, 106, 0.42), transparent 23vw);
    mix-blend-mode: screen;
}

.rare-lightning.flash { animation: lightningFlash 1.15s ease-out; }

.outcome-basins {
    position: absolute;
    left: 37%;
    bottom: 2vh;
    display: flex;
    gap: 1.4vw;
    transform: translateX(-50%);
}

.basin {
    position: relative;
    width: clamp(86px, 10vw, 150px);
    height: clamp(34px, 4vw, 60px);
    border-radius: 50%;
    background: radial-gradient(ellipse at center, rgba(125, 231, 255, 0.36), rgba(22, 74, 69, 0.5) 45%, rgba(5, 7, 11, 0.9) 72%);
    border: 1px solid rgba(234, 244, 241, 0.28);
    box-shadow: inset 0 0 20px rgba(125, 231, 255, 0.26), 0 12px 34px rgba(5, 7, 11, 0.76);
}

.basin::after {
    content: '';
    position: absolute;
    inset: 18% 10%;
    border: 1px solid rgba(125, 231, 255, 0.42);
    border-radius: 50%;
    animation: basinRipple 3.8s ease-out infinite;
}

.basin span {
    position: absolute;
    inset: auto 0 -24px;
    text-align: center;
    font: 500 0.68rem var(--mono);
    color: var(--glass-cyan);
}

.condensation-labels span {
    position: absolute;
    left: var(--x);
    top: var(--y);
    font: 500 0.7rem var(--mono);
    color: rgba(234, 244, 241, 0.42);
    letter-spacing: 0.05em;
    text-shadow: 0 0 12px rgba(125, 231, 255, 0.24);
}

.site-inscription {
    position: fixed;
    top: 24px;
    right: 30px;
    z-index: 6;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 3px;
    color: var(--ceramic-mist);
    mix-blend-mode: screen;
}

.site-inscription span {
    font: 400 1.12rem var(--serif);
    letter-spacing: 0.05em;
}

.site-inscription em {
    font: 400 0.62rem var(--mono);
    color: rgba(125, 231, 255, 0.66);
    font-style: normal;
    text-transform: uppercase;
    letter-spacing: 0.18em;
}

main { position: relative; z-index: 2; }

.chamber {
    position: relative;
    min-height: 100vh;
    padding: clamp(80px, 10vh, 120px) clamp(22px, 6vw, 88px);
}

.chamber-hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
    align-items: center;
    gap: 8vw;
}

.scene-title h1 {
    margin: 0;
    font-family: var(--song);
    font-size: clamp(8rem, 23vw, 28rem);
    line-height: 0.74;
    letter-spacing: -0.12em;
    color: rgba(234, 244, 241, 0.72);
    text-shadow: 0 0 32px rgba(125, 231, 255, 0.24), 0 18px 70px rgba(5, 7, 11, 0.9);
    filter: blur(0.2px);
}

.kicker {
    margin: 0 0 18px;
    font: 600 0.72rem var(--mono);
    color: var(--glass-cyan);
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.title-refraction {
    margin-top: 22px;
    font: italic clamp(2rem, 5vw, 5.8rem) var(--serif);
    color: var(--ceramic-mist);
    max-width: 720px;
    text-shadow: 0 0 24px rgba(141, 108, 255, 0.28);
}

.observation-plaque, .chamber-copy, .rare-copy {
    max-width: 480px;
    padding: 26px 28px;
    border: 1px solid rgba(125, 231, 255, 0.22);
    background: linear-gradient(145deg, rgba(5, 7, 11, 0.5), rgba(24, 42, 58, 0.26));
    box-shadow: inset 0 1px 0 rgba(234, 244, 241, 0.08), 0 22px 70px rgba(5, 7, 11, 0.5);
    backdrop-filter: blur(9px);
}

.observation-plaque h2, .chamber-copy h2, .rare-copy h2 {
    margin: 0 0 16px;
    font: 400 clamp(2.2rem, 4.4vw, 4.8rem)/0.94 var(--serif);
    color: var(--ceramic-mist);
}

.observation-plaque p, .chamber-copy p, .rare-copy p {
    margin: 0;
    font-size: clamp(1rem, 1.4vw, 1.2rem);
    line-height: 1.8;
    color: rgba(234, 244, 241, 0.76);
}

.observation-plaque p span { color: var(--rare-event-lightning); font-family: var(--mono); }

.formula, .warning-stamp {
    display: inline-block;
    margin-top: 22px;
    font: 500 0.78rem var(--mono);
    color: var(--glass-cyan);
    letter-spacing: 0.04em;
    border-bottom: 1px solid rgba(125, 231, 255, 0.34);
}

.listen-line {
    position: absolute;
    left: 8vw;
    bottom: 9vh;
    font: 500 0.82rem var(--mono);
    letter-spacing: 0.18em;
    color: var(--rare-event-lightning);
    text-transform: uppercase;
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.chamber-samples { display: flex; align-items: center; justify-content: flex-start; }
.left-copy { margin-left: 4vw; transform: rotate(-1.2deg); }

.decimal-cloud {
    position: absolute;
    right: 7vw;
    top: 17vh;
    width: min(35vw, 440px);
    height: 58vh;
    font-family: var(--mono);
    color: rgba(234, 244, 241, 0.5);
}

.decimal-cloud span {
    position: absolute;
    padding: 10px 12px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(125, 231, 255, 0.15), transparent 72%);
    animation: decimalFloat 6s ease-in-out infinite alternate;
}

.decimal-cloud span:nth-child(1) { left: 4%; top: 10%; }
.decimal-cloud span:nth-child(2) { left: 62%; top: 4%; animation-delay: -1s; }
.decimal-cloud span:nth-child(3) { left: 30%; top: 34%; animation-delay: -2s; }
.decimal-cloud span:nth-child(4) { left: 72%; top: 50%; animation-delay: -3s; }
.decimal-cloud span:nth-child(5) { left: 8%; top: 69%; animation-delay: -1.8s; }
.decimal-cloud span:nth-child(6) { left: 47%; top: 82%; color: var(--rare-event-lightning); }

.chamber-conditional { display: grid; place-items: center end; }
.conditional-plaque { margin-right: 5vw; }

.sluice-diagram {
    position: absolute;
    left: 5vw;
    bottom: 17vh;
    width: min(44vw, 580px);
    filter: drop-shadow(0 0 20px rgba(125, 231, 255, 0.24));
}

.sluice-diagram .pipe, .sluice-diagram circle {
    fill: none;
    stroke: var(--glass-cyan);
    stroke-width: 5;
    stroke-linecap: round;
    stroke-dasharray: 650;
    stroke-dashoffset: 650;
    animation: drawRivulet 6s ease-in-out infinite;
}

.sluice-diagram .thin { stroke: var(--probability-violet); stroke-width: 3; animation-delay: 1s; }
.sluice-diagram text { fill: var(--rare-event-lightning); font: 600 28px var(--mono); }

.chamber-rare { display: grid; place-items: center start; }
.rare-copy { margin-left: 8vw; border-color: rgba(249, 255, 106, 0.28); }
.warning-stamp { color: var(--red-misread-warning-ink); border-color: rgba(255, 77, 94, 0.5); }

.chamber-pool {
    display: grid;
    grid-template-columns: minmax(260px, 44vw) minmax(280px, 500px);
    align-items: center;
    gap: 7vw;
}

.posterior-pool {
    position: relative;
    width: min(42vw, 560px);
    aspect-ratio: 1 / 0.62;
    border-radius: 50%;
    background: radial-gradient(ellipse at center, rgba(125, 231, 255, 0.22), rgba(22, 74, 69, 0.58) 45%, rgba(5, 7, 11, 0.95) 73%);
    border: 1px solid rgba(234, 244, 241, 0.3);
    box-shadow: inset 0 0 60px rgba(125, 231, 255, 0.18), 0 34px 90px rgba(5, 7, 11, 0.86);
}

.posterior-pool span {
    position: absolute;
    inset: 50% auto auto 50%;
    transform: translate(-50%, -50%);
    font: italic 2.6rem var(--serif);
    color: rgba(234, 244, 241, 0.7);
}

.pool-ripple {
    position: absolute;
    inset: 16%;
    border: 1px solid rgba(125, 231, 255, 0.38);
    border-radius: 50%;
    animation: posteriorRipple 5s ease-out infinite;
}

.ripple-two { inset: 27%; animation-delay: 1.4s; border-color: rgba(141, 108, 255, 0.42); }
.ripple-three { inset: 38%; animation-delay: 2.8s; border-color: rgba(249, 255, 106, 0.3); }
.pool-copy { transform: rotate(1deg); }

@keyframes waterLight {
    from { transform: translate3d(-2%, -1%, 0) rotate(-1deg); opacity: 0.46; }
    to { transform: translate3d(2%, 1%, 0) rotate(1deg); opacity: 0.84; }
}

@keyframes fogDrift {
    from { transform: translate3d(-4vw, -2vh, 0) scale(0.96); }
    to { transform: translate3d(5vw, 3vh, 0) scale(1.08); }
}

@keyframes drawRivulet {
    0% { stroke-dashoffset: 1280; opacity: 0; }
    16% { opacity: 0.96; }
    58% { stroke-dashoffset: 0; opacity: 0.9; }
    100% { stroke-dashoffset: -1280; opacity: 0; }
}

@keyframes dropletFall {
    0% { transform: translate3d(0, -10vh, 0) scale(0.8); opacity: 0; }
    9% { opacity: 0.9; }
    38% { transform: translate3d(var(--drift-a), 42vh, 0) scale(1); }
    61% { transform: translate3d(var(--drift-b), 68vh, 0) scale(0.88); }
    88% { opacity: 0.86; }
    100% { transform: translate3d(var(--drift-c), 110vh, 0) scale(0.45); opacity: 0; }
}

@keyframes basinRipple {
    from { transform: scale(0.2); opacity: 0.82; }
    to { transform: scale(1.5); opacity: 0; }
}

@keyframes decimalFloat {
    from { transform: translate3d(-8px, 12px, 0); filter: blur(0.2px); }
    to { transform: translate3d(10px, -16px, 0); filter: blur(1px); }
}

@keyframes lightningFlash {
    0%, 100% { opacity: 0; }
    8% { opacity: 0.95; }
    14% { opacity: 0.1; }
    21% { opacity: 0.75; }
    39% { opacity: 0.18; }
}

@keyframes posteriorRipple {
    from { transform: scale(0.45); opacity: 0.78; }
    to { transform: scale(1.55); opacity: 0; }
}

@media (max-width: 760px) {
    .rain-cylinder { left: 59%; width: 54vw; opacity: 0.82; }
    .chamber-hero, .chamber-pool { grid-template-columns: 1fr; }
    .hero-plaque, .conditional-plaque, .rare-copy, .left-copy, .pool-copy { margin: 0; }
    .scene-title h1 { font-size: 36vw; }
    .title-refraction { font-size: 3rem; }
    .decimal-cloud, .sluice-diagram { opacity: 0.5; width: 70vw; }
    .posterior-pool { width: 86vw; }
    .site-inscription { right: 18px; top: 18px; }
}