:root {
    --ink: #1B1712;
    --paper: #F6F3EE;
    --paper-2: #FCFAF7;
    --card: #FFFFFF;
    --caramel: #B4692A;
    --caramel-soft: #E8B778;
    --muted: #8A8178;
    --line: #E2DBD0;

    --font-display: "Space Grotesk", system-ui, sans-serif;
    --font-body: "Inter", system-ui, sans-serif;
    --font-mono: "IBM Plex Mono", ui-monospace, monospace;

    --wrap: 1120px;
    --radius: 14px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.08;
    margin: 0;
}

p {
    margin: 0;
}

a {
    color: inherit;
    text-decoration: none;
}

.wrap {
    width: 100%;
    max-width: var(--wrap);
    margin: 0 auto;
    padding: 0 28px;
}

.accent {
    color: var(--caramel);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 15px;
    letter-spacing: -0.01em;
    padding: 12px 20px;
    border-radius: 999px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn-solid {
    background: var(--ink);
    color: var(--paper);
}

.btn-solid:hover {
    background: var(--caramel);
}

.btn-ghost {
    background: transparent;
    border-color: var(--line);
    color: var(--ink);
}

.btn-ghost:hover {
    border-color: var(--ink);
}

.btn-ghost-light {
    border-color: rgba(246, 243, 238, 0.35);
    color: var(--paper);
}

.btn-ghost-light:hover {
    border-color: var(--paper);
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(246, 243, 238, 0.82);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color .2s ease, background .2s ease;
}

.site-header.scrolled {
    border-bottom-color: var(--line);
}

.header-inner {
    display: flex;
    align-items: center;
    gap: 24px;
    height: 68px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.02em;
    font-size: 17px;
}

.brand-mark {
    display: block;
}

.nav {
    display: flex;
    gap: 28px;
    margin-left: auto;
    font-size: 15px;
    color: var(--muted);
}

.nav a {
    transition: color .15s ease;
}

.nav a:hover {
    color: var(--ink);
}

.header-inner .btn-solid {
    padding: 10px 18px;
}

/* Hero */
.hero {
    padding: 104px 0 88px;
}

.eyebrow {
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--caramel);
    margin-bottom: 26px;
}

.hero-title {
    font-size: clamp(44px, 7vw, 82px);
    font-weight: 600;
    max-width: 14ch;
}

.hero-sub {
    margin-top: 26px;
    max-width: 52ch;
    font-size: 19px;
    color: #52493f;
}

.hero-cta {
    margin-top: 34px;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.stat-strip {
    margin: 72px 0 0;
    padding: 28px 0 0;
    border-top: 1px solid var(--line);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.stat dt {
    font-size: 14px;
    color: var(--muted);
    margin-bottom: 8px;
}

.stat dd {
    margin: 0;
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: clamp(28px, 4vw, 40px);
    letter-spacing: -0.02em;
    color: var(--ink);
}

/* Sections */
.section {
    padding: 92px 0;
}

.section-alt {
    background: var(--paper-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.section-head {
    max-width: 60ch;
    margin-bottom: 52px;
}

.section-index {
    display: block;
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--caramel);
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.section-head h2 {
    font-size: clamp(30px, 4.4vw, 44px);
}

.section-head p {
    margin-top: 16px;
    font-size: 18px;
    color: #52493f;
}

/* Dataset catalog */
.catalog {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.ds-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px;
    display: flex;
    flex-direction: column;
    transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.ds-card:hover {
    transform: translateY(-4px);
    border-color: var(--caramel-soft);
    box-shadow: 0 18px 40px -24px rgba(27, 23, 18, 0.35);
}

.ds-top {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.ds-top h3 {
    font-size: 21px;
}

.ds-count {
    font-family: var(--font-mono);
    font-size: 12.5px;
    color: var(--caramel);
    background: rgba(180, 105, 42, 0.09);
    border: 1px solid rgba(180, 105, 42, 0.2);
    padding: 4px 9px;
    border-radius: 999px;
    white-space: nowrap;
}

.ds-desc {
    color: #52493f;
    font-size: 15px;
    margin-bottom: 20px;
}

.schema {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 13.5px;
    margin-top: auto;
}

.schema tr {
    border-top: 1px solid var(--line);
}

.schema tr:last-child {
    border-bottom: 1px solid var(--line);
}

.schema td {
    padding: 9px 0;
}

.schema .field {
    color: var(--ink);
}

.schema .type {
    text-align: right;
    color: var(--muted);
}

/* Steps */
.steps {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
    counter-reset: none;
}

.step {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px;
}

.step-n {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--caramel);
    letter-spacing: 0.08em;
}

.step h3 {
    font-size: 20px;
    margin: 14px 0 10px;
}

.step p {
    color: #52493f;
    font-size: 15px;
}

.format-row {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 32px 0 0;
    padding: 0;
}

.format-row li {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--ink);
    border: 1px solid var(--line);
    background: var(--card);
    padding: 8px 14px;
    border-radius: 999px;
}

/* Compliance */
.compliance-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.note {
    padding: 26px;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    background: var(--paper-2);
}

.note h3 {
    font-size: 19px;
    margin-bottom: 10px;
}

.note p {
    color: #52493f;
    font-size: 15px;
}

/* CTA */
.cta {
    background: var(--ink);
    color: var(--paper);
    padding: 96px 0;
}

.cta-inner {
    text-align: center;
    max-width: 640px;
}

.cta h2 {
    font-size: clamp(32px, 5vw, 52px);
}

.cta p {
    margin: 20px auto 0;
    color: #cbc2b6;
    font-size: 18px;
    max-width: 46ch;
}

.cta-actions {
    margin-top: 34px;
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

.cta .btn-solid {
    background: var(--caramel);
    color: #fff;
}

.cta .btn-solid:hover {
    background: var(--caramel-soft);
    color: var(--ink);
}

/* Footer */
.footer {
    background: var(--paper);
    padding: 44px 0;
}

.footer-inner {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    font-family: var(--font-display);
    font-weight: 600;
}

.footer-tag {
    color: var(--muted);
    font-size: 15px;
}

.footer-copy {
    margin-left: auto;
    color: var(--muted);
    font-size: 14px;
}

/* Reveal animation */
[data-reveal] {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .6s ease, transform .6s ease;
}

[data-reveal].is-visible {
    opacity: 1;
    transform: none;
}

@media (prefers-reduced-motion: reduce) {
    [data-reveal] {
        opacity: 1;
        transform: none;
        transition: none;
    }

    html {
        scroll-behavior: auto;
    }
}

/* Responsive */
@media (max-width: 860px) {
    .catalog,
    .steps,
    .compliance-grid {
        grid-template-columns: 1fr;
    }

    .nav {
        display: none;
    }
}

@media (max-width: 560px) {
    body {
        font-size: 16px;
    }

    .hero {
        padding: 72px 0 64px;
    }

    .stat-strip {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .header-inner .btn-solid {
        display: none;
    }

    .footer-copy {
        margin-left: 0;
        width: 100%;
    }
}