:root {
    --bg: #070b14;
    --panel: #0d1424;
    --panel-2: #101a2f;
    --ink: #f8fbff;
    --muted: #a9b6c9;
    --line: rgba(255, 255, 255, 0.12);
    --space: #ff4fb3;
    --space-2: #7dd3fc;
    --gold: #ffd166;
    --green: #6ee7a8;
    --orange: #ff9f6e;
    --purple: #b784ff;
    --cyan: #8be9f1;
    --gray: #8d99aa;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(ellipse at 72% 12%, rgba(255,255,255,0.24), transparent 18%),
        radial-gradient(ellipse at 58% 20%, rgba(255,255,255,0.12), transparent 32%),
        radial-gradient(circle at 12% 8%, rgba(125, 211, 252, 0.15), transparent 20%),
        radial-gradient(circle at 92% 16%, rgba(255, 79, 179, 0.16), transparent 26%),
        radial-gradient(circle at 8% 18%, rgba(255,255,255,0.7) 0 1px, transparent 2px),
        radial-gradient(circle at 22% 10%, rgba(255,255,255,0.55) 0 1px, transparent 2px),
        radial-gradient(circle at 35% 24%, rgba(255,255,255,0.45) 0 1px, transparent 2px),
        radial-gradient(circle at 72% 30%, rgba(255,255,255,0.35) 0 1px, transparent 2px),
        linear-gradient(120deg, rgba(255,255,255,0.13), transparent 28%, rgba(255,255,255,0.04) 42%, transparent 70%),
        #070b14;
    filter: contrast(1.08);
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(circle at 17% 21%, rgba(255,255,255,0.55) 0 1px, transparent 2px),
        radial-gradient(circle at 31% 42%, rgba(255,255,255,0.34) 0 1px, transparent 2px),
        radial-gradient(circle at 64% 18%, rgba(255,255,255,0.45) 0 1px, transparent 2px),
        radial-gradient(circle at 84% 38%, rgba(255,255,255,0.3) 0 1px, transparent 2px);
    opacity: 0.55;
}

a {
    color: inherit;
}

.hero {
    min-height: 62vh;
    display: grid;
    align-content: center;
    gap: 22px;
    padding: clamp(24px, 4vw, 56px);
}

.eyebrow,
.chapter,
.chart-heading span,
.scenario-controls span {
    color: var(--space-2);
    font-size: clamp(0.78rem, 1.1vw, 0.94rem);
    font-weight: 850;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.hero h1 {
    max-width: 1320px;
    margin: 0;
    font-size: clamp(2.8rem, 4.8vw, 5.6rem);
    line-height: 0.95;
    letter-spacing: 0;
}

.lede {
    max-width: 1320px;
    margin: 0;
    color: #d7deea;
    font-size: clamp(1.2rem, 1.9vw, 2.05rem);
    line-height: 1.42;
}

.scenario-controls,
.step {
    border: 1px solid var(--line);
    background: linear-gradient(145deg, rgba(16, 26, 47, 0.86), rgba(8, 12, 22, 0.86));
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.24);
    backdrop-filter: blur(12px);
}

.story-shell {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(330px, 36vw);
    min-height: 520vh;
}

.chart-panel {
    position: sticky;
    top: 0;
    height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr auto;
    padding: clamp(18px, 3vw, 44px);
    border-right: 1px solid var(--line);
    background: rgba(7, 11, 20, 0.72);
}

.chart-heading {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: start;
}

.chart-heading strong {
    display: block;
    width: fit-content;
    color: var(--ink);
    font-size: clamp(1.9rem, 4vw, 4.6rem);
    font-weight: 900;
    line-height: 0.9;
    white-space: nowrap;
}

.chart-heading p {
    max-width: none;
    margin: 0;
    color: #c8d3e4;
    font-size: clamp(0.9rem, 1.05vw, 1.02rem);
    line-height: 1.25;
    text-align: right;
    white-space: nowrap;
}

#chart {
    min-height: 0;
}

svg {
    width: 100%;
    height: 100%;
    display: block;
    overflow: visible;
}

.axis path {
    display: none;
}

.axis line,
.grid line {
    stroke: rgba(255,255,255,0.08);
}

.axis text {
    fill: #b8c4d8;
    font-size: 13px;
}

.grid path {
    display: none;
}

.bar-bg {
    fill: rgba(255,255,255,0.055);
}

.bar {
    rx: 12;
}

.stem {
    stroke: rgba(255,255,255,0.22);
    stroke-width: 1.5;
}

.dot {
    cursor: default;
}

.label {
    fill: var(--ink);
    font-size: 15px;
    font-weight: 780;
}

.label-small {
    fill: #b8c4d8;
    font-size: 12px;
    font-weight: 780;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.big-number {
    fill: var(--ink);
    font-size: clamp(42px, 7vw, 92px);
    font-weight: 950;
}

.annotation {
    fill: #d7deea;
    font-size: 15px;
    line-height: 1.35;
}

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
    min-height: 30px;
    align-items: center;
    color: #dce5f4;
    font-size: 0.9rem;
}

.legend-item {
    display: inline-flex;
    gap: 7px;
    align-items: center;
}

.legend-swatch {
    width: 10px;
    height: 10px;
    border-radius: 999px;
}

.steps {
    display: grid;
    align-content: start;
    gap: 58vh;
    padding: 72vh clamp(18px, 3vw, 48px) 72vh;
}

.step {
    min-height: 330px;
    display: grid;
    align-content: center;
    gap: 18px;
    padding: clamp(24px, 3vw, 42px);
    opacity: 0.34;
    transform: translateY(14px);
    transition: opacity 240ms ease, transform 240ms ease, border-color 240ms ease;
}

.step.is-active {
    opacity: 1;
    transform: translateY(0);
    border-color: rgba(255, 79, 179, 0.52);
}

.story-text {
    paint-order: stroke;
    stroke: rgba(7, 11, 20, 0.72);
    stroke-width: 5px;
    stroke-linejoin: round;
}

.step h2 {
    margin: 0;
    font-size: clamp(2rem, 3.4vw, 4.2rem);
    line-height: 0.98;
    letter-spacing: 0;
}

.step p {
    max-width: 620px;
    margin: 0;
    color: #cbd5e1;
    font-size: clamp(1rem, 1.35vw, 1.28rem);
    line-height: 1.58;
}

.scenario-controls {
    width: min(1180px, calc(100vw - 36px));
    margin: 8vh auto;
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(220px, 0.7fr) minmax(220px, 0.7fr);
    gap: 28px;
    align-items: end;
    padding: clamp(24px, 4vw, 52px);
}

.scenario-controls h2 {
    margin: 8px 0 12px;
    font-size: clamp(2.4rem, 5vw, 5.2rem);
    line-height: 0.92;
}

.scenario-controls p {
    margin: 0;
    color: #cbd5e1;
    font-size: 1.1rem;
    line-height: 1.55;
}

.scenario-controls label {
    display: grid;
    gap: 14px;
    color: var(--ink);
    font-size: 1rem;
    font-weight: 780;
}

.scenario-controls input {
    accent-color: var(--space);
    width: 100%;
}

.scenario-controls output {
    color: var(--space);
    font-size: 2.5rem;
    font-weight: 950;
}

.source-note {
    width: min(1180px, calc(100vw - 36px));
    margin: 0 auto 56px;
    color: #aebbd0;
    font-size: 0.95rem;
    line-height: 1.65;
}

.source-note a {
    color: #e6f4ff;
    font-weight: 850;
}

@media (max-width: 1020px) {
    .story-shell {
        display: block;
        min-height: auto;
    }

    .chart-panel {
        position: sticky;
        z-index: 1;
        height: 66vh;
        min-height: 460px;
        border-right: 0;
        border-bottom: 1px solid var(--line);
        box-shadow: 0 22px 70px rgba(0, 0, 0, 0.34);
    }

    .steps {
        position: relative;
        z-index: 2;
        gap: 48vh;
        padding: 16vh 18px 72vh;
    }

    .step {
        opacity: 0.42;
        min-height: 0;
        transform: translateY(10px);
    }

    .step.is-active {
        opacity: 1;
        transform: translateY(0);
    }

    .scenario-controls {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 680px) {
    .hero {
        min-height: auto;
        gap: 18px;
        padding: 34px 18px 42px;
    }

    .hero h1 {
        font-size: clamp(2.5rem, 13vw, 4.25rem);
        line-height: 0.98;
    }

    .lede {
        font-size: 1.08rem;
        line-height: 1.52;
    }

    .chart-heading {
        gap: 10px;
        align-items: start;
        flex-direction: row;
    }

    .chart-heading span {
        font-size: 0.68rem;
        letter-spacing: 0.13em;
    }

    .chart-heading strong {
        font-size: clamp(1.9rem, 9.5vw, 2.75rem);
    }

    .chart-heading p {
        max-width: 48vw;
        overflow: hidden;
        font-size: 0.72rem;
        line-height: 1.3;
        text-align: right;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .chart-panel {
        height: 68vh;
        min-height: 430px;
        padding: 16px;
    }

    .axis text {
        font-size: 10px;
    }

    .label {
        font-size: 11px;
    }

    .label-small {
        font-size: 9px;
        letter-spacing: 0.06em;
    }

    .legend {
        gap: 6px 10px;
        font-size: 0.72rem;
        line-height: 1.2;
    }

    .legend-swatch {
        width: 8px;
        height: 8px;
    }

    .steps {
        gap: 52vh;
        padding: 13vh 14px 68vh;
    }

    .step {
        gap: 12px;
        padding: 20px;
    }

    .step h2 {
        font-size: clamp(1.85rem, 10vw, 3.1rem);
        line-height: 1;
    }

    .step p {
        font-size: 0.96rem;
        line-height: 1.5;
    }
}