:root {
    --bg: #090a0c;
    --bg-soft: #111317;
    --panel: rgba(17, 20, 24, 0.86);
    --panel-strong: #171b21;
    --panel-highlight: #1d232b;
    --border: rgba(176, 189, 204, 0.16);
    --border-strong: rgba(118, 214, 255, 0.34);
    --accent: #76d6ff;
    --accent-strong: #b9efff;
    --accent-dim: rgba(118, 214, 255, 0.14);
    --text: #f5f7fa;
    --text-muted: #b2bac5;
    --text-soft: #738091;
    --danger: #ff8c72;
    --shadow: rgba(0, 0, 0, 0.36);
    --mono: "IBM Plex Mono", monospace;
    --sans: "IBM Plex Sans", sans-serif;
    --display: "Space Grotesk", sans-serif;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, rgba(118, 214, 255, 0.1), transparent 28%),
        radial-gradient(circle at 85% 0%, rgba(118, 214, 255, 0.04), transparent 22%),
        linear-gradient(180deg, #060709 0%, #0b0d11 50%, #060709 100%);
    color: var(--text);
    font-family: var(--sans);
}

.landing-grid-bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.3;
    background-image:
        linear-gradient(rgba(160, 188, 214, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(160, 188, 214, 0.04) 1px, transparent 1px);
    background-size: 36px 36px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent 92%);
}

.landing-shell {
    position: relative;
    width: min(1240px, calc(100vw - 40px));
    margin: 0 auto;
    padding: 24px 0 72px;
}

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 28px;
    padding: 8px 0;
}

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--text);
    text-decoration: none;
    font-family: var(--display);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.site-brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--border-strong);
    background: rgba(118, 214, 255, 0.08);
    color: var(--accent);
    font-family: var(--mono);
    font-size: 0.85rem;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
}

.site-nav a,
.button-tertiary,
.inline-link {
    color: var(--text-muted);
    text-decoration: none;
}

.site-nav a:hover,
.button-tertiary:hover,
.inline-link:hover {
    color: var(--accent);
}

.hero,
.contrast-card,
.proof-step-card,
.proof-panel,
.three-up article,
.principle-grid article,
.use-case-grid article,
.trust-grid,
.runtime-card {
    border: 1px solid var(--border);
    background: var(--panel);
    box-shadow: 0 22px 50px var(--shadow);
    backdrop-filter: blur(12px);
}

.hero {
    display: grid;
    grid-template-columns: 1.12fr 0.88fr;
    gap: 28px;
    padding: 34px;
    margin-bottom: 26px;
}

.eyebrow {
    margin: 0 0 14px;
    color: var(--accent);
    font-family: var(--mono);
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.hero h1,
.section-heading h2 {
    margin: 0;
    font-family: var(--display);
    font-weight: 700;
    letter-spacing: -0.05em;
}

.hero h1 {
    max-width: 11ch;
    font-size: clamp(2.9rem, 6vw, 5.4rem);
    line-height: 0.92;
}

.hero-subtitle,
.section-heading p,
.contrast-card li,
.proof-step-card p,
.three-up p,
.principle-grid p,
.use-case-grid p,
.trust p {
    color: var(--text-muted);
    line-height: 1.65;
}

.hero-subtitle {
    max-width: 62ch;
    margin: 18px 0 0;
    font-size: 1.05rem;
}

.hero-actions,
.trust-actions,
.proof-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.hero-actions {
    margin-top: 28px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 46px;
    padding: 0 18px;
    border: 1px solid transparent;
    text-decoration: none;
    font-weight: 600;
    font-family: var(--sans);
    cursor: pointer;
    transition: transform 0.18s ease, border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.button:hover,
.button:focus-visible {
    transform: translateY(-1px);
    outline: none;
}

.button-primary {
    background: var(--accent);
    color: #061018;
}

.button-primary:hover,
.button-primary:focus-visible {
    background: var(--accent-strong);
}

.button-secondary {
    border-color: var(--border-strong);
    color: var(--text);
    background: rgba(118, 214, 255, 0.06);
}

.button-secondary:hover,
.button-secondary:focus-visible {
    border-color: var(--accent);
    color: var(--accent);
}

.button-tertiary {
    padding: 0;
    min-height: auto;
    border: 0;
    background: transparent;
}

.hero-proof {
    margin: 16px 0 0;
    color: var(--text-soft);
    font-family: var(--mono);
    font-size: 0.88rem;
}

.proof-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.proof-strip span,
.panel-badge,
.status-pill,
.step-index {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 10px;
    border: 1px solid var(--border);
    color: var(--text-soft);
    font-family: var(--mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.hero-runtime {
    display: grid;
    gap: 16px;
    align-content: start;
}

.hero-chain {
    display: grid;
    gap: 10px;
    padding: 18px;
    border: 1px solid var(--border);
    background: rgba(10, 12, 15, 0.78);
}

.hero-chain-step {
    padding: 12px 14px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.01);
    color: var(--text-muted);
    font-weight: 500;
}

.hero-chain-step code,
.proof-step-card code {
    font-family: var(--mono);
    color: var(--accent);
}

.hero-chain-step.is-active {
    border-color: var(--border-strong);
    background: rgba(118, 214, 255, 0.08);
    color: var(--text);
    transform: translateX(6px);
}

.hero-chain-arrow {
    width: 1px;
    height: 14px;
    margin-left: 18px;
    background: linear-gradient(180deg, var(--accent), transparent);
}

.runtime-card {
    display: grid;
    grid-template-columns: 1fr 0.92fr;
    gap: 16px;
    padding: 18px;
}

.runtime-visual,
.runtime-receipt {
    border: 1px solid var(--border);
    background: rgba(9, 11, 14, 0.78);
}

.runtime-visual {
    padding: 12px;
}

.runtime-map {
    width: 100%;
    height: auto;
    display: block;
}

.map-boundary,
.proof-boundary {
    fill: rgba(79, 92, 112, 0.22);
    stroke: rgba(118, 214, 255, 0.46);
    stroke-width: 2;
}

.map-points circle,
.proof-points circle {
    fill: var(--accent);
    opacity: 0;
    transform-origin: center;
    transform: scale(0.2);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.map-buffers circle,
.proof-buffers circle {
    fill: rgba(118, 214, 255, 0.08);
    stroke: rgba(118, 214, 255, 0.36);
    stroke-width: 2;
    opacity: 0;
    transform-origin: center;
    transform: scale(0.3);
    transition: transform 0.34s ease, opacity 0.34s ease;
}

.runtime-receipt {
    padding: 14px;
    display: grid;
    gap: 14px;
    align-content: space-between;
}

.receipt-terminal,
.code-block,
.code-snippet {
    margin: 0;
    padding: 16px;
    border: 1px solid rgba(118, 214, 255, 0.12);
    background: #090b0e;
    color: #d7e0ea;
    font-family: var(--mono);
    font-size: 0.84rem;
    line-height: 1.6;
    overflow: auto;
}

.receipt-line {
    opacity: 0.28;
    transform: translateX(-4px);
    transition: opacity 0.24s ease, transform 0.24s ease;
}

.receipt-line.is-live {
    opacity: 1;
    transform: translateX(0);
}

.runtime-export-chip {
    color: var(--text-soft);
    font-family: var(--mono);
    font-size: 0.78rem;
}

.runtime-export-chip span {
    color: var(--accent);
}

.hero-runtime[data-phase="discover"] [data-step="discover"],
.hero-runtime[data-phase="points"] [data-step="points"],
.hero-runtime[data-phase="buffer"] [data-step="buffer"],
.hero-runtime[data-phase="export"] [data-step="export"] {
    border-color: var(--border-strong);
    background: rgba(118, 214, 255, 0.08);
    color: var(--text);
    transform: translateX(6px);
}

.hero-runtime[data-phase="discover"] [data-line="discover"],
.hero-runtime[data-phase="points"] [data-line="points"],
.hero-runtime[data-phase="buffer"] [data-line="buffer"],
.hero-runtime[data-phase="export"] [data-line="export"] {
    opacity: 1;
    transform: translateX(0);
}

.hero-runtime[data-phase="points"] .map-points circle,
.hero-runtime[data-phase="buffer"] .map-points circle,
.hero-runtime[data-phase="export"] .map-points circle,
.proof-map.has-points .proof-points circle,
.proof-map.has-buffers .proof-points circle {
    opacity: 1;
    transform: scale(1);
}

.hero-runtime[data-phase="buffer"] .map-buffers circle,
.hero-runtime[data-phase="export"] .map-buffers circle,
.proof-map.has-buffers .proof-buffers circle {
    opacity: 1;
    transform: scale(1);
}

section {
    margin-top: 26px;
}

.section-heading {
    margin-bottom: 18px;
}

.section-heading h2 {
    font-size: clamp(2rem, 3vw, 3rem);
    line-height: 0.98;
}

.contrast-grid,
.proof-cards,
.proof-grid,
.three-up,
.principle-grid,
.use-case-grid {
    display: grid;
    gap: 18px;
}

.contrast-grid,
.principle-grid,
.use-case-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.contrast-card,
.proof-step-card,
.proof-panel,
.three-up article,
.principle-grid article,
.use-case-grid article,
.trust-grid {
    padding: 22px;
}

.contrast-card h3,
.proof-step-card h3,
.proof-panel h3,
.three-up h3,
.principle-grid h3,
.use-case-grid h3 {
    margin: 0 0 10px;
    font-family: var(--display);
    font-size: 1.15rem;
    letter-spacing: -0.03em;
}

.contrast-card ul {
    margin: 0;
    padding-left: 18px;
}

.contrast-card-accent {
    background: linear-gradient(180deg, rgba(118, 214, 255, 0.08), rgba(23, 27, 33, 0.95));
}

.proof-toolbar {
    margin-bottom: 18px;
}

.status-pill {
    color: var(--accent);
    border-color: var(--border-strong);
}

.status-pill.is-error {
    color: var(--danger);
    border-color: rgba(255, 140, 114, 0.4);
}

.status-pill.is-running {
    color: var(--text);
}

.proof-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-bottom: 18px;
}

.proof-step-card {
    position: relative;
    min-height: 220px;
}

.proof-step-card.is-active {
    border-color: var(--border-strong);
    box-shadow: 0 0 0 1px rgba(118, 214, 255, 0.18), 0 22px 50px var(--shadow);
}

.proof-step-card.is-done .step-index {
    color: var(--accent);
    border-color: var(--border-strong);
}

.proof-step-card dl {
    display: grid;
    gap: 10px;
    margin: 16px 0 0;
}

.proof-step-card dt {
    color: var(--text-soft);
    font-family: var(--mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.proof-step-card dd {
    margin: 4px 0 0;
    font-family: var(--mono);
    color: var(--text);
}

.step-index {
    margin-bottom: 16px;
    color: var(--text-soft);
}

.proof-grid {
    grid-template-columns: 1.04fr 0.96fr;
}

.proof-panel:last-child {
    grid-column: span 2;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
}

.proof-map {
    width: 100%;
    height: auto;
    display: block;
    border: 1px solid rgba(118, 214, 255, 0.1);
    background: #090b0e;
}

.inline-link.is-disabled {
    pointer-events: none;
    opacity: 0.48;
}

.three-up {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.code-snippet {
    margin-top: 18px;
}

.principle-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
}

.use-case-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.trust-grid {
    display: grid;
    gap: 18px;
    align-items: start;
}

.trust-actions {
    justify-content: flex-start;
}

@media (max-width: 1100px) {
    .hero,
    .runtime-card,
    .proof-grid {
        grid-template-columns: 1fr;
    }

    .principle-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 820px) {
    .landing-shell {
        width: min(100vw - 24px, 100%);
        padding-bottom: 48px;
    }

    .site-header,
    .hero-actions,
    .proof-toolbar,
    .trust-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero,
    .contrast-grid,
    .proof-cards,
    .three-up,
    .principle-grid,
    .use-case-grid {
        grid-template-columns: 1fr;
    }

    .hero,
    .contrast-card,
    .proof-step-card,
    .proof-panel,
    .three-up article,
    .principle-grid article,
    .use-case-grid article,
    .trust-grid {
        padding: 18px;
    }

    .hero h1 {
        max-width: none;
        font-size: clamp(2.4rem, 11vw, 4.1rem);
    }

    .proof-panel:last-child {
        grid-column: auto;
    }
}