:root {
    color-scheme: light;
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-muted: #f2f6fb;
    --surface-strong: #e6edf5;
    --text: #14202b;
    --text-soft: #4f6071;
    --border: #d6dde7;
    --border-strong: #b8c4d1;
    --accent: #0e6a7a;
    --accent-soft: #e1f0f4;
    --note: #eff6ff;
    --shadow: 0 14px 34px rgba(18, 32, 49, 0.08);
    --sidebar-width: 18rem;
    --content-width: 78rem;
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

a {
    color: inherit;
}

code,
pre {
    font-family: "SFMono-Regular", SFMono-Regular, ui-monospace, Menlo, Consolas, "Liberation Mono", monospace;
}

code {
    font-size: 0.95em;
}

.nav-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 30;
    display: none;
    border: 1px solid var(--border-strong);
    background: var(--surface);
    color: var(--text);
    padding: 0.7rem 1rem;
    border-radius: 999px;
    box-shadow: var(--shadow);
    font: inherit;
}

.page-shell {
    display: grid;
    grid-template-columns: minmax(15rem, var(--sidebar-width)) minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    position: sticky;
    top: 0;
    align-self: start;
    height: 100vh;
    padding: 2rem 1.5rem;
    border-right: 1px solid var(--border);
    background: #eef3f8;
}

.sidebar-brand h1 {
    margin: 0.25rem 0 0.75rem;
    font-size: 1.55rem;
    line-height: 1.2;
}

.sidebar-summary,
.sidebar-meta p {
    margin: 0;
    color: var(--text-soft);
    font-size: 0.95rem;
}

.sidebar-nav {
    margin: 2rem 0;
    display: grid;
    gap: 0.42rem;
}

.sidebar-nav a {
    text-decoration: none;
    color: var(--text-soft);
    padding: 0.48rem 0.65rem;
    border-radius: 6px;
}

.sidebar-nav a.active,
.sidebar-nav a:hover {
    color: var(--accent);
    background: var(--accent-soft);
}

.sidebar-meta {
    display: grid;
    gap: 0.42rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.content {
    max-width: var(--content-width);
    width: 100%;
    padding: 2rem clamp(1.25rem, 3vw, 3rem) 4rem;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.8fr) minmax(16rem, 1fr);
    gap: 2rem;
    padding-bottom: 2.25rem;
    border-bottom: 1px solid var(--border);
}

.eyebrow,
.section-kicker {
    margin: 0;
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
}

.hero h2 {
    margin: 0.45rem 0 1rem;
    font-size: clamp(2rem, 4vw, 3.15rem);
    line-height: 1.08;
}

.hero-lead {
    margin: 0;
    max-width: 56rem;
    color: var(--text-soft);
    font-size: 1.05rem;
}

.hero-facts {
    display: grid;
    gap: 1rem;
    align-self: start;
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
}

.fact-label {
    display: block;
    color: var(--text-soft);
    font-size: 0.85rem;
}

.fact-value {
    display: block;
    margin-top: 0.18rem;
    font-weight: 600;
}

.doc-section {
    padding: 2.6rem 0;
    border-bottom: 1px solid var(--border);
}

.section-heading h3 {
    margin: 0.35rem 0 1rem;
    font-size: 1.85rem;
    line-height: 1.2;
}

.feature-grid,
.notes-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 1.25rem;
}

.feature,
.notes-grid article {
    padding: 1.15rem 1.2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.feature h4,
.notes-grid h4,
.callout h4,
.example-copy h4,
.two-column h4,
.header-card h4,
.api-group h5 {
    margin: 0 0 0.55rem;
    line-height: 1.25;
}

.feature p,
.notes-grid p,
.callout p,
.sidebar-brand p,
.two-column p,
.header-card p {
    margin: 0;
}

.supporting-copy {
    margin-top: 0.8rem;
    color: var(--text-soft);
}

.callout {
    margin-top: 1.25rem;
    padding: 1rem 1.2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.callout.note {
    background: var(--note);
}

.two-column {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.plain-list {
    margin: 0.75rem 0 0;
    padding-left: 1.15rem;
}

.plain-list li + li {
    margin-top: 0.4rem;
}

pre {
    margin: 0.95rem 0 0;
    padding: 1rem 1.15rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: #101723;
    color: #e5edf7;
    overflow: auto;
}

.reference-toolbar {
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    margin-top: 1.35rem;
}

.search-control {
    display: grid;
    gap: 0.55rem;
    max-width: 36rem;
}

.search-control span {
    font-weight: 600;
}

.search-control input {
    width: 100%;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    padding: 0.8rem 1rem;
    font: inherit;
    background: var(--surface);
}

.search-control input:focus {
    outline: 2px solid transparent;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(14, 106, 122, 0.12);
}

.toolbar-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.toolbar-button {
    border: 1px solid var(--border-strong);
    background: var(--surface);
    color: var(--text);
    padding: 0.75rem 1rem;
    border-radius: 999px;
    font: inherit;
}

.toolbar-button:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

.header-card {
    padding: 1.15rem 1.2rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
}

.header-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-top: 0.9rem;
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: 0.28rem 0.62rem;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 600;
}

.api-groups {
    display: grid;
    gap: 1.4rem;
    margin-top: 1.4rem;
}

.api-group {
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-muted);
}

.api-group h5 {
    font-size: 1.05rem;
}

.api-group-copy {
    color: var(--text-soft);
    margin-bottom: 1rem;
}

.api-card-stack {
    display: grid;
    gap: 0.85rem;
}

.api-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    overflow: hidden;
}

.api-card[hidden],
.api-group[hidden] {
    display: none;
}

.api-card summary {
    list-style: none;
    cursor: pointer;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: start;
    padding: 1rem 1.05rem;
}

.api-card summary::-webkit-details-marker {
    display: none;
}

.api-card summary:hover {
    background: var(--surface-muted);
}

.api-card-title {
    margin: 0;
    font-size: 1rem;
}

.api-card-signature {
    margin: 0.35rem 0 0;
    color: var(--text-soft);
    font-size: 0.92rem;
}

.api-card-meta {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.45rem;
}

.api-card-body {
    padding: 0 1.05rem 1.05rem;
    border-top: 1px solid var(--border);
}

.api-body-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.api-panel {
    min-width: 0;
}

.api-panel h6 {
    margin: 1rem 0 0.45rem;
    font-size: 0.9rem;
    color: var(--text-soft);
    text-transform: uppercase;
}

.api-panel p {
    margin: 0;
}

.api-panel ul {
    margin: 0.5rem 0 0;
    padding-left: 1.15rem;
}

.api-panel li + li {
    margin-top: 0.32rem;
}

.api-panel pre {
    margin-top: 0.55rem;
}

.api-meta-list {
    display: grid;
    gap: 0.35rem;
    margin-top: 0.8rem;
    color: var(--text-soft);
    font-size: 0.92rem;
}

.api-meta-list strong {
    color: var(--text);
}

.example-switcher {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.example-tab {
    border: 1px solid var(--border-strong);
    background: var(--surface);
    color: var(--text-soft);
    padding: 0.7rem 1rem;
    border-radius: 999px;
    font: inherit;
}

.example-tab.active,
.example-tab:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
}

.example-stage {
    display: grid;
    gap: 1.75rem;
    grid-template-columns: minmax(18rem, 1.1fr) minmax(0, 1.35fr);
    margin-top: 1.4rem;
}

.example-copy {
    min-width: 0;
}

.example-visuals {
    display: grid;
    gap: 1rem;
    align-content: start;
}

.visual-block {
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
}

.visual-block h5 {
    margin: 0 0 0.85rem;
    font-size: 1rem;
}

.equation-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.9rem;
}

.equation-symbol {
    color: var(--accent);
    font-size: 1.35rem;
    font-weight: 700;
}

.matrix-figure {
    display: inline-block;
    position: relative;
    padding: 0.5rem 0.95rem;
}

.matrix-figure::before,
.matrix-figure::after {
    content: "";
    position: absolute;
    top: 0.2rem;
    bottom: 0.2rem;
    width: 0.6rem;
}

.matrix-figure::before {
    left: 0;
    border-left: 2px solid var(--text);
    border-top: 2px solid var(--text);
    border-bottom: 2px solid var(--text);
}

.matrix-figure::after {
    right: 0;
    border-right: 2px solid var(--text);
    border-top: 2px solid var(--text);
    border-bottom: 2px solid var(--text);
}

.matrix-grid {
    display: grid;
    gap: 0.35rem 0.85rem;
    align-items: center;
    justify-items: center;
    min-width: 8rem;
    font-variant-numeric: tabular-nums;
}

.matrix-grid span {
    min-width: 2.4rem;
    text-align: center;
    white-space: nowrap;
}

.visual-caption {
    margin-top: 0.6rem;
    color: var(--text-soft);
    font-size: 0.92rem;
}

.code-panel {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    overflow: hidden;
}

.code-panel pre {
    margin: 0;
    border: none;
    border-radius: 0;
}

@media (max-width: 1100px) {
    .page-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: min(20rem, 86vw);
        transform: translateX(-100%);
        transition: transform 180ms ease;
        z-index: 20;
        box-shadow: var(--shadow);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .content {
        padding-top: 5rem;
    }

    .hero,
    .two-column,
    .example-stage,
    .feature-grid,
    .notes-grid,
    .reference-toolbar,
    .api-body-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .content {
        padding-inline: 1rem;
    }

    .api-card summary {
        grid-template-columns: 1fr;
    }

    .api-card-meta {
        justify-content: flex-start;
    }

    .matrix-grid span {
        min-width: 2.1rem;
    }
}