:root {
    /* Design typography tokens: "Righteous" (Google Fonts), "DM Sans" (Google Fonts), "Space Mono" (Google Fonts). Scroll-Driven Transitions: Use IntersectionObserver (not scroll event listeners). Space Mono used only for tiny labels. */
    --bg-light: #e8ecf1;
    --bg-mid: #b0bec5;
    --bg-dark: #37474f;
    --ink: #263238;
    --ink-soft: #78909c;
    --ripple: #00bcd4;
    --lavender: #b39ddb;
    --gold: #ffd54f;
    --display: Righteous, Cooper Black, Arial Rounded MT Bold, system-ui, sans-serif;
    --body: DM Sans, Inter, Avenir, system-ui, sans-serif;
    --mono: Space Mono, SFMono-Regular, Consolas, monospace;
    --inflate: 0 4px 6px rgba(0,0,0,.07), 0 10px 20px rgba(0,0,0,.06), 0 20px 40px rgba(0,0,0,.05), 0 40px 80px rgba(0,0,0,.04), inset 0 -8px 16px rgba(0,0,0,.10);
    --inflate-dark: 0 6px 10px rgba(0,0,0,.22), 0 14px 28px rgba(0,0,0,.18), 0 28px 56px rgba(0,0,0,.14), 0 50px 100px rgba(0,0,0,.10), inset 0 -10px 20px rgba(0,0,0,.18);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: #e8ecf1; color: #263238; font-family: var(--body); font-size: 1.125rem; line-height: 1.75; overflow-x: hidden; }
.section { min-height: 70vh; overflow: hidden; padding: 6rem 8vw; position: relative; width: 100%; }
.label { color: #78909c; display: inline-block; font-family: var(--mono); font-size: .875rem; letter-spacing: .08em; margin-bottom: 1.5rem; text-transform: uppercase; }

.section--drop { align-items: center; background: #e8ecf1; display: flex; justify-content: center; min-height: 100vh; padding: 0 8vw; }
.drop-stage { align-items: center; display: flex; flex-direction: column; gap: 2.5rem; justify-content: center; position: relative; text-align: center; }
.sphere { background: radial-gradient(circle at 35% 30%, #b0bec5 0%, #78909c 50%, #37474f 100%); border-radius: 50%; box-shadow: var(--inflate); height: 200px; opacity: 0; position: relative; transform: scale(.8); width: 200px; }
.sphere::after { background: radial-gradient(ellipse, rgba(255,255,255,.5), transparent 68%); border-radius: 50%; content: ""; height: 30%; left: 25%; position: absolute; top: 15%; width: 40%; }
.sphere--hero { animation: sphere-in .8s cubic-bezier(.34,1.56,.64,1) .3s forwards, sphere-breath 6s ease-in-out 1.4s infinite; }
.sphere--hero.pulse { animation: sphere-squish .8s ease-out; opacity: 1; transform: scale(1); }
.brand { color: #263238; font-family: var(--display); font-size: clamp(2.5rem, 8vw, 7rem); font-weight: 700; letter-spacing: .04em; line-height: 1; min-height: 1.1em; }
.brand .char { display: inline-block; opacity: 0; transform: translateY(18px); transition: opacity .5s ease, transform .5s cubic-bezier(.34,1.56,.64,1); }
.brand .char.on { opacity: 1; transform: translateY(0); }
.eyebrow, .scroll-hint span, .hint { color: #78909c; font-family: var(--mono); font-size: .875rem; letter-spacing: .08em; text-transform: uppercase; }
.eyebrow { opacity: 0; transform: translateY(10px); transition: opacity .8s ease, transform .8s ease; }
.section--drop.ready .eyebrow { opacity: 1; transform: translateY(0); }
.ripple-halo { height: 0; left: 50%; pointer-events: none; position: absolute; top: 100px; transform: translate(-50%,-50%); width: 0; }
.ring, .field-ring { border: 2px solid #00bcd4; border-radius: 50%; opacity: 0; position: absolute; }
.ring { height: 200px; left: 0; margin: -100px 0 0 -100px; top: 0; width: 200px; }
.ring--1 { animation: ring-out 3.2s ease-out .8s infinite; } .ring--2 { animation: ring-out 3.2s ease-out 1.2s infinite; } .ring--3 { animation: ring-out 3.2s ease-out 1.6s infinite; } .ring--4 { animation: ring-out 3.2s ease-out 2s infinite; }
.scroll-hint { align-items: center; animation: fade-up 1s ease 2.2s forwards; bottom: 2.5rem; display: flex; flex-direction: column; gap: .75rem; left: 50%; opacity: 0; position: absolute; transform: translateX(-50%); }
.scroll-hint span { font-size: .75rem; letter-spacing: .18em; }
.scroll-hint i { animation: scroll-pulse 2.2s ease-in-out infinite; background: linear-gradient(to bottom, #78909c, transparent); display: block; height: 48px; width: 1px; }

.section--manifesto { align-items: center; background: #e8ecf1; display: flex; min-height: 90vh; }
.manifesto-text { margin-left: 6vw; max-width: 90%; position: relative; width: 540px; z-index: 2; }
.manifesto-body { color: #263238; font-size: clamp(1.15rem, 1.8vw, 1.5rem); line-height: 1.8; }
.manifesto-body em { color: #00bcd4; font-style: normal; font-weight: 500; }
.ripple-field { height: 720px; max-height: 70vw; max-width: 70vw; pointer-events: none; position: absolute; right: -4vw; top: 50%; transform: translateY(-50%); width: 720px; }
.field-ring { height: 60px; left: 50%; margin: -30px 0 0 -30px; top: 50%; width: 60px; }
.reveal.on .field-ring--1 { animation: field-out 5s ease-out 0s infinite; } .reveal.on .field-ring--2 { animation: field-out 5s ease-out 1.25s infinite; } .reveal.on .field-ring--3 { animation: field-out 5s ease-out 2.5s infinite; } .reveal.on .field-ring--4 { animation: field-out 5s ease-out 3.75s infinite; }

.section--propagation { background-color: #e8ecf1; background-image: radial-gradient(circle, rgba(176,190,197,.18) 1.2px, transparent 1.4px); background-size: 40px 40px; min-height: 110vh; padding: 8rem 6vw 10rem; }
.section-header { margin-bottom: 4rem; max-width: 640px; }
.section-title, .echo-statement { color: inherit; font-family: var(--display); font-weight: 700; letter-spacing: .02em; line-height: 1.1; }
.section-title { color: #263238; font-size: clamp(1.8rem, 4vw, 3.5rem); }
.card-cluster { height: 820px; margin: 0 auto; max-width: 1100px; position: relative; width: 100%; }
.card-wrap { filter: drop-shadow(0 20px 40px rgba(0,0,0,.12)); position: absolute; }
.card-wrap--a { left: 4%; top: 20px; } .card-wrap--b { left: 42%; top: 260px; } .card-wrap--c { right: 3%; top: 80px; }
.card { cursor: pointer; height: 380px; perspective: 1000px; position: relative; width: 280px; }
.card-inner { height: 100%; position: relative; transform-style: preserve-3d; transition: transform .7s cubic-bezier(.25,.46,.45,.94); width: 100%; }
.card:hover .card-inner, .card.is-flipped .card-inner { transform: rotateY(180deg); }
.card-face { backface-visibility: hidden; border-radius: 24px; box-shadow: var(--inflate); display: flex; flex-direction: column; inset: 0; justify-content: space-between; overflow: hidden; padding: 2.25rem; position: absolute; }
.card-face--front { background: radial-gradient(circle at 30% 25%, #e8ecf1 0%, #b0bec5 58%, #78909c 100%); color: #263238; }
.card-face--front::after, .card-face--back::before { background: radial-gradient(ellipse, rgba(255,255,255,.55), transparent 65%); border-radius: 50%; content: ""; height: 28%; left: 10%; position: absolute; top: 8%; width: 42%; }
.card-face--back { align-items: center; background: linear-gradient(135deg, #00bcd4 0%, #b39ddb 100%); color: #e8ecf1; justify-content: center; text-align: center; transform: rotateY(180deg); }
.card-face--back::before { opacity: .55; }
.card-label { color: #78909c; font-family: var(--mono); font-size: .75rem; letter-spacing: .12em; position: relative; text-transform: uppercase; z-index: 2; }
.card-word { color: #263238; font-family: var(--display); font-size: 2.5rem; font-weight: 700; letter-spacing: .02em; position: relative; z-index: 2; }
.card-poem { font-size: 1.1rem; font-weight: 500; line-height: 1.65; position: relative; z-index: 2; }
.icon { align-self: flex-end; height: 96px; position: relative; width: 96px; z-index: 2; }
.icon--impact span { border: 3px solid #263238; border-radius: 50%; inset: 0; position: absolute; } .icon--impact i { background: #00bcd4; border-radius: 3px; height: 3px; left: -8%; position: absolute; top: 50%; transform: translateY(-50%) rotate(-12deg); width: 116%; }
.icon--propagate span { border: 3px solid #263238; border-radius: 14px; left: 50%; position: absolute; top: 50%; transform: translate(-50%,-50%); } .icon--propagate span:nth-child(1) { height: 32px; width: 32px; } .icon--propagate span:nth-child(2) { border-color: #78909c; height: 60px; width: 60px; } .icon--propagate span:nth-child(3) { border-color: #00bcd4; height: 88px; width: 88px; }
.icon--radiance span, .icon--radiance i { background: #263238; border-radius: 6px; height: 52px; left: 50%; margin: -26px 0 0 -26px; position: absolute; top: 50%; transform: rotate(45deg); width: 52px; } .icon--radiance i { background: #00bcd4; opacity: .75; transform: rotate(0); }
.hint { font-size: .8rem; letter-spacing: .12em; margin-top: 4rem; text-align: center; }

.section--echo { align-items: center; display: flex; min-height: 85vh; padding: 8rem 8vw; }
.echo--light { background: #e8ecf1; color: #263238; } .echo--mid { background-color: #b0bec5; background-image: radial-gradient(circle, rgba(38,50,56,.15) 1.2px, transparent 1.4px); background-size: 40px 40px; color: #263238; } .echo--dark { background: #37474f; color: #e8ecf1; } .echo--dark .label { color: #b0bec5; }
.echo-inner { align-items: center; display: flex; gap: 4rem; justify-content: space-between; margin: 0 auto; max-width: 1200px; position: relative; width: 100%; } .echo-inner--reverse { flex-direction: row-reverse; }
.echo-text { flex: 1 1 55%; max-width: 620px; } .echo-statement { font-size: clamp(2rem, 5vw, 3.5rem); margin-bottom: 1.5rem; } .echo-body { font-size: 1.15rem; line-height: 1.8; max-width: 520px; opacity: .88; }
.object { flex: 0 0 auto; position: relative; }
.object--torus { animation: float-a 4s ease-in-out infinite alternate; background: radial-gradient(circle at 32% 28%, #e8ecf1 0%, #78909c 55%, #37474f 100%); border-radius: 50%; box-shadow: var(--inflate); height: 260px; width: 260px; } .object--torus::after { background: radial-gradient(ellipse, rgba(255,255,255,.55), transparent 65%); border-radius: 50%; content: ""; height: 26%; left: 22%; position: absolute; top: 12%; width: 38%; } .object--torus span { background: #e8ecf1; border-radius: 50%; box-shadow: inset 0 6px 14px rgba(0,0,0,.25), inset 0 -2px 6px rgba(255,255,255,.6); height: 36%; left: 32%; position: absolute; top: 32%; width: 36%; }
.object--pill { animation: float-b 3.5s ease-in-out infinite alternate; background: radial-gradient(circle at 28% 25%, #e8ecf1 0%, #b0bec5 45%, #78909c 100%); border-radius: 80px; box-shadow: var(--inflate); height: 160px; width: 320px; } .object--pill::after { background: radial-gradient(ellipse, rgba(255,255,255,.55), transparent 65%); border-radius: 50%; content: ""; height: 36%; left: 10%; position: absolute; top: 14%; width: 38%; }
.object--cube { animation: float-c 4.5s ease-in-out infinite alternate; background: radial-gradient(circle at 30% 28%, #78909c 0%, #37474f 55%, #263238 100%); border-radius: 40px; box-shadow: var(--inflate-dark); height: 240px; width: 240px; } .object--cube::after { background: radial-gradient(ellipse, rgba(179,157,219,.45), transparent 65%); border-radius: 36px; content: ""; height: 32%; left: 12%; position: absolute; top: 10%; width: 44%; }

.section--closing { align-items: center; background: #263238; display: flex; justify-content: center; min-height: 90vh; }
.closing-stage { align-items: center; display: flex; flex-direction: column; gap: 2rem; text-align: center; }
.sphere--closing { animation: sphere-breath 5s ease-in-out infinite; background: radial-gradient(circle at 35% 30%, #b0bec5 0%, #78909c 50%, #263238 100%); box-shadow: var(--inflate-dark); height: 120px; opacity: 1; transform: scale(1); width: 120px; }
.tagline { color: #ffd54f; font-family: var(--display); font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 700; letter-spacing: .04em; text-shadow: 0 2px 0 rgba(0,0,0,.15); }
.closing-mark { color: rgba(232,236,241,.4); font-family: var(--mono); font-size: .75rem; letter-spacing: .22em; margin-top: 2rem; text-transform: uppercase; }

.reveal { opacity: 0; transform: translateY(30px); transition: opacity .8s ease, transform .8s ease; } .reveal.on { opacity: 1; transform: translateY(0); }
@keyframes sphere-in { from { opacity: 0; transform: scale(.8); } to { opacity: 1; transform: scale(1); } }
@keyframes sphere-breath { 0%,100% { transform: scale(1); } 50% { transform: scale(1.03); } }
@keyframes sphere-squish { 0% { transform: scale(1); } 30% { transform: scale(1.05) scaleY(.88); } 60% { transform: scale(.97) scaleY(1.06); } 100% { transform: scale(1); } }
@keyframes ring-out { 0% { opacity: 0; transform: scale(.5); } 10% { opacity: .55; } 100% { opacity: 0; transform: scale(3); } }
@keyframes field-out { 0% { opacity: 0; transform: scale(.4); } 10% { opacity: .35; } 100% { opacity: 0; transform: scale(10); } }
@keyframes fade-up { from { opacity: 0; transform: translate(-50%,10px); } to { opacity: 1; transform: translate(-50%,0); } }
@keyframes scroll-pulse { 0%,100% { opacity: .6; transform: scaleY(1); transform-origin: top; } 50% { opacity: 1; transform: scaleY(.3); transform-origin: top; } }
@keyframes float-a { from { transform: translateY(0) rotate(0); } to { transform: translateY(-12px) rotate(3deg); } } @keyframes float-b { from { transform: translateY(0) rotate(-2deg); } to { transform: translateY(-10px) rotate(2deg); } } @keyframes float-c { from { transform: translateY(0) rotate(-3deg) scale(1); } to { transform: translateY(-14px) rotate(2deg) scale(1.02); } }

@media (max-width: 900px) { .section { padding: 5rem 6vw; } .manifesto-text { margin-left: 0; } .ripple-field { display: none; } .card-cluster { align-items: center; display: flex; flex-direction: column; gap: 2.5rem; height: auto; } .card-wrap { left: auto; position: relative; right: auto; top: auto; } .echo-inner, .echo-inner--reverse { flex-direction: column; gap: 3rem; } .object { align-self: center; } }
@media (max-width: 520px) { .sphere--hero { height: 160px; width: 160px; } .ring { height: 160px; margin: -80px 0 0 -80px; width: 160px; } .card { height: 360px; width: 260px; } .object--pill { height: 130px; width: 260px; } .object--torus, .object--cube { height: 210px; width: 210px; } }