:root {
    /* Compliance tokens from DESIGN.md: Interaction Layer:** IntersectionObserver` `threshold: 0.3` This rarest category batch (1% (Google Roboto Slab" */
    --abyss: #0a1f14;
    --canopy: #0d3b24;
    --glass: #1a4d33;
    --mint: #b8e6cc;
    --sage: #6b9f83;
    --neon: #39ff8e;
    --teal: #00d4aa;
    --deep: #0d5c3f;
    --pink: #ff3d7f;
    --display: "Inter", system-ui, sans-serif;
    --body: "Zilla Slab", serif;
    --mono: "Overpass Mono", monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    background: var(--abyss);
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
    scroll-snap-type: y mandatory;
    background:
        radial-gradient(circle at 20% 15%, rgba(57, 255, 142, 0.12), transparent 22rem),
        radial-gradient(circle at 85% 70%, rgba(0, 212, 170, 0.11), transparent 26rem),
        var(--abyss);
    color: var(--mint);
    font-family: var(--body);
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 20;
    pointer-events: none;
    background:
        repeating-linear-gradient(90deg, rgba(184, 230, 204, 0.025) 0 1px, transparent 1px 78px),
        repeating-linear-gradient(0deg, rgba(184, 230, 204, 0.02) 0 1px, transparent 1px 78px),
        linear-gradient(rgba(10, 31, 20, 0), rgba(10, 31, 20, 0.22));
    mix-blend-mode: screen;
}

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 50;
    width: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--deep), var(--neon), var(--pink));
    box-shadow: 0 0 18px rgba(57, 255, 142, 0.72);
}

.hex-nav {
    position: fixed;
    top: 50%;
    right: 1.25rem;
    z-index: 40;
    display: grid;
    gap: 0.72rem;
    transform: translateY(-50%);
}

.hex-button {
    width: 3.05rem;
    height: 3.42rem;
    border: 0;
    clip-path: polygon(50% 0%, 94% 25%, 94% 75%, 50% 100%, 6% 75%, 6% 25%);
    background: linear-gradient(145deg, rgba(26, 77, 51, 0.78), rgba(10, 31, 20, 0.62));
    color: var(--sage);
    cursor: pointer;
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.08em;
    box-shadow: inset 0 0 0 2px rgba(57, 255, 142, 0.58), 0 0 0 rgba(57, 255, 142, 0);
    transition: transform 240ms ease, color 240ms ease, box-shadow 240ms ease, background 240ms ease;
}

.hex-button span {
    display: inline-block;
    transform: rotate(-8deg);
}

.hex-button:hover,
.hex-button.active {
    color: var(--neon);
    transform: scale(1.16) rotate(8deg);
    background: linear-gradient(145deg, rgba(57, 255, 142, 0.22), rgba(13, 92, 63, 0.82));
    box-shadow: inset 0 0 0 2px var(--neon), 0 0 16px rgba(57, 255, 142, 0.55), 0 0 34px rgba(0, 212, 170, 0.22);
}

.hex-button.neighbor {
    transform: scale(1.06);
}

.crystal-scroll {
    position: relative;
    z-index: 1;
}

.facet-section {
    position: relative;
    display: grid;
    place-items: center;
    width: 100vw;
    min-height: 100vh;
    padding: clamp(2rem, 6vw, 6rem);
    overflow: hidden;
    isolation: isolate;
    scroll-snap-align: start;
    background:
        linear-gradient(120deg, rgba(184, 230, 204, 0.04), transparent 28%, rgba(57, 255, 142, 0.08) 50%, transparent 72%),
        var(--abyss);
}

.facet-section:nth-child(odd) {
    transform: rotate(1.5deg) scale(1.045);
}

.facet-section:nth-child(even) {
    transform: rotate(-1.5deg) scale(1.045);
}

.facet-section:nth-child(even) {
    background:
        linear-gradient(300deg, rgba(0, 212, 170, 0.1), transparent 34%, rgba(57, 255, 142, 0.08) 63%, transparent),
        var(--canopy);
}

.facet-section::before {
    content: "";
    position: absolute;
    inset: -12%;
    z-index: -2;
    opacity: 0.55;
    background-image:
        linear-gradient(30deg, transparent 45%, rgba(184, 230, 204, 0.08) 46%, transparent 48%),
        linear-gradient(150deg, transparent 43%, rgba(57, 255, 142, 0.09) 44%, transparent 47%),
        radial-gradient(circle at 50% 55%, rgba(13, 92, 63, 0.4), transparent 36rem);
}

.facet-section::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    opacity: 0.13;
    background-image: url("data:image/svg+xml,%3Csvg width='64' height='74' viewBox='0 0 64 74' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M32 1 62 18v38L32 73 2 56V18Z' fill='none' stroke='%2339ff8e' stroke-width='1'/%3E%3C/svg%3E");
    background-size: 64px 74px;
}

.facet-entry { background-color: var(--abyss); }
.facet-structure { background-color: var(--canopy); }
.facet-bubbles { background-color: #0a1f14; }
.facet-type { background-color: #0d3b24; }
.facet-vapor { background-color: #0a1f14; }
.facet-feedback { background-color: #0d3b24; }
.facet-close { background-color: #0a1f14; }

.hangul-rain {
    position: absolute;
    inset: 8% auto auto -8%;
    width: 120%;
    white-space: nowrap;
    color: rgba(184, 230, 204, 0.08);
    font-family: var(--mono);
    font-size: clamp(3rem, 11vw, 10rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    transform: rotate(-11deg);
    animation: driftText 18s linear infinite alternate;
}

.bubble-container {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.bubble {
    position: absolute;
    left: var(--x);
    bottom: -7rem;
    width: var(--size);
    height: var(--size);
    border-radius: 50%;
    opacity: 0;
    filter: blur(var(--blur));
    background:
        radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.42), transparent 12%),
        radial-gradient(circle at 30% 30%, rgba(57, 255, 142, 0.4), rgba(0, 212, 170, 0.1), transparent 70%);
    box-shadow: inset -0.4rem -0.5rem 1rem rgba(10, 31, 20, 0.18), 0 0 1rem rgba(57, 255, 142, 0.16);
    animation: bubbleRise var(--duration) linear var(--delay) infinite;
}

.bubble.sparked {
    background:
        radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.5), transparent 10%),
        radial-gradient(circle at 40% 35%, rgba(255, 61, 127, 0.44), rgba(57, 255, 142, 0.2), transparent 72%);
}

.facet-lines {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
}

.facet-lines svg {
    width: 100%;
    height: 100%;
}

.facet-lines polyline,
.facet-lines line,
.facet-lines circle {
    fill: none;
    stroke: var(--neon);
    stroke-width: 0.38;
    opacity: 0.34;
    vector-effect: non-scaling-stroke;
    stroke-dasharray: 220;
    stroke-dashoffset: 220;
}

.facet-section.visible .facet-lines polyline,
.facet-section.visible .facet-lines line,
.facet-section.visible .facet-lines circle {
    animation: fractureReveal 1800ms cubic-bezier(0.19, 1, 0.22, 1) forwards;
}

.content-block {
    position: relative;
    z-index: 5;
    width: min(78vw, 780px);
    padding: clamp(2rem, 5vw, 4.8rem);
    background:
        linear-gradient(135deg, rgba(184, 230, 204, 0.12), transparent 24%),
        rgba(26, 77, 51, 0.58);
    border: 1px solid rgba(57, 255, 142, 0.36);
    border-radius: 1rem;
    box-shadow: 0 2rem 6rem rgba(0, 0, 0, 0.35), inset 0 0 2.6rem rgba(57, 255, 142, 0.08);
    backdrop-filter: blur(13px) saturate(1.35);
    text-align: center;
    transform: skewY(-3deg);
}

.facet-section:nth-child(even) .content-block {
    transform: skewY(3deg);
}

.content-block > * {
    transform: skewY(3deg);
}

.facet-section:nth-child(even) .content-block > * {
    transform: skewY(-3deg);
}

.content-block::before,
.content-block::after {
    content: "";
    position: absolute;
    border: 1px solid rgba(57, 255, 142, 0.23);
    pointer-events: none;
}

.content-block::before {
    inset: 0.75rem;
    clip-path: polygon(0 0, 38% 0, 50% 14%, 62% 0, 100% 0, 100% 100%, 62% 100%, 50% 86%, 38% 100%, 0 100%);
}

.content-block::after {
    inset: -0.9rem;
    opacity: 0.35;
    transform: rotate(2deg);
}

.label {
    display: inline-block;
    margin-bottom: 1rem;
    color: var(--sage);
    font-family: var(--mono);
    font-size: clamp(0.66rem, 1vw, 0.82rem);
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

h1,
h2 {
    margin-bottom: 1.25rem;
    color: var(--neon);
    font-family: var(--display);
    font-size: clamp(3rem, 7vw, 6rem);
    font-weight: 900;
    line-height: 0.92;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-shadow: 0 0 18px rgba(57, 255, 142, 0.32), 0.06em 0.06em 0 rgba(13, 92, 63, 0.55);
}

h2 {
    font-size: clamp(2.4rem, 6vw, 5.3rem);
}

p {
    color: var(--mint);
    font-family: var(--body);
    font-size: clamp(1.05rem, 1.85vw, 1.45rem);
    font-weight: 300;
    line-height: 1.65;
    letter-spacing: 0.01em;
}

small {
    display: block;
    margin-top: 1.6rem;
    color: var(--teal);
    font-family: var(--mono);
    letter-spacing: 0.24em;
    text-transform: uppercase;
}

.prism-meter,
.stat-row,
.glyph-strip {
    display: flex;
    justify-content: center;
    gap: 0.85rem;
    margin-top: 1.75rem;
}

.prism-meter span {
    width: 5rem;
    height: 0.8rem;
    transform: skewX(-26deg);
    background: linear-gradient(90deg, var(--deep), var(--neon), var(--teal));
    box-shadow: 0 0 18px rgba(57, 255, 142, 0.42);
}

.stat-row b,
.glyph-strip span {
    min-width: 4.7rem;
    padding: 0.72rem 0.95rem;
    clip-path: polygon(15% 0, 85% 0, 100% 50%, 85% 100%, 15% 100%, 0 50%);
    background: rgba(10, 31, 20, 0.54);
    color: var(--teal);
    font-family: var(--mono);
    font-size: 0.85rem;
    letter-spacing: 0.08em;
}

.glyph-strip span {
    color: var(--neon);
    font-family: var(--display);
    font-size: 1.5rem;
    font-weight: 900;
}

.interactive-link,
.pulse-button {
    display: inline-block;
    margin-top: 1.55rem;
    color: var(--teal);
    font-family: var(--mono);
    font-size: 0.86rem;
    font-weight: 700;
    letter-spacing: 0.13em;
    text-decoration: none;
    text-transform: uppercase;
}

.pulse-button {
    padding: 0.9rem 1.25rem;
    border: 1px solid rgba(57, 255, 142, 0.55);
    clip-path: polygon(10% 0, 100% 0, 90% 100%, 0 100%);
    background: rgba(10, 31, 20, 0.44);
    cursor: pointer;
}

.interactive-link {
    padding-bottom: 0.2rem;
    background: linear-gradient(90deg, var(--pink), var(--neon)) 0 100% / 0 2px no-repeat;
    transition: color 220ms ease, text-shadow 220ms ease, background-size 220ms ease;
}

.interactive-link:hover,
.pulse-button:hover {
    color: var(--neon);
    text-shadow: 0 0 16px rgba(255, 61, 127, 0.55);
    background-size: 100% 2px;
}

.pulse-button:hover {
    background: rgba(255, 61, 127, 0.14);
    box-shadow: 0 0 26px rgba(255, 61, 127, 0.26);
}

.facet-section.pulse::before {
    animation: pinkFacetPulse 540ms ease-out;
}

@keyframes bubbleRise {
    0% { transform: translate3d(0, 8vh, 0) scale(0.62); opacity: 0; }
    10% { opacity: var(--opacity); }
    52% { transform: translate3d(var(--sway), -52vh, 0) scale(1); }
    92% { opacity: calc(var(--opacity) * 0.8); }
    100% { transform: translate3d(calc(var(--sway) * -0.65), -116vh, 0) scale(1.24); opacity: 0; }
}

@keyframes fractureReveal {
    to { stroke-dashoffset: 0; }
}

@keyframes driftText {
    from { transform: translateX(-6%) rotate(-11deg); }
    to { transform: translateX(6%) rotate(-11deg); }
}

@keyframes pinkFacetPulse {
    0% { opacity: 0.95; filter: hue-rotate(0deg) brightness(1.5); }
    100% { opacity: 0.55; filter: hue-rotate(80deg) brightness(1); }
}

@media (max-width: 780px) {
    .hex-nav {
        right: 0.45rem;
        gap: 0.42rem;
    }

    .hex-button {
        width: 2.25rem;
        height: 2.54rem;
        font-size: 0.52rem;
    }

    .facet-section {
        padding: 1.4rem 3.25rem 1.4rem 1.4rem;
    }

    .content-block {
        width: min(86vw, 660px);
        padding: 2rem 1.5rem;
    }

    .stat-row,
    .glyph-strip,
    .prism-meter {
        flex-wrap: wrap;
    }
}