:root {
    --beyond-ink: #2D2722;
    --beyond-paper: #FBF8F2;
    --beyond-muted: #74695D;
    --beyond-line: #D8CCBC;
    --beyond-accent: #7A5237;
    --beyond-panel: #302823;
    --beyond-cognac: #A06B43;
    --beyond-brass: #B49357;
    --beyond-clay: #A86650;
    --beyond-moss: #70785E;
    --beyond-oat: #C6A98D;
    --beyond-cream: #FFF9EF;
    --beyond-nav-background: rgba(251, 248, 242, 0.95);
    --beyond-control-background: rgba(48, 40, 35, 0.96);
    --beyond-control-border: rgba(255, 249, 239, 0.15);
    --beyond-glow: rgba(160, 107, 67, 0.45);
    --beyond-grid: rgba(255, 249, 239, 0.06);
    --beyond-canvas-text: rgba(255, 249, 239, 0.7);
}

html[data-theme="dark"] {
    --beyond-ink: #FFF9EF;
    --beyond-paper: #211B18;
    --beyond-muted: #C6B8A8;
    --beyond-line: #5A4032;
    --beyond-accent: #C99062;
    --beyond-panel: #181311;
    --beyond-cognac: #C99062;
    --beyond-brass: #D2B36E;
    --beyond-clay: #C97A60;
    --beyond-moss: #899174;
    --beyond-oat: #D8BCA3;
    --beyond-cream: #FFF9EF;
    --beyond-nav-background: rgba(33, 27, 24, 0.96);
    --beyond-control-background: rgba(24, 19, 17, 0.96);
    --beyond-control-border: rgba(255, 249, 239, 0.18);
    --beyond-glow: rgba(201, 144, 98, 0.38);
    --beyond-grid: rgba(255, 249, 239, 0.08);
    --beyond-canvas-text: rgba(255, 249, 239, 0.78);
}

html {
    scroll-behavior: smooth;
}

.beyond-page {
    background: var(--beyond-paper);
    color: var(--beyond-ink);
    font-family: "Lato", sans-serif;
    margin: 0;
}

.beyond-page * {
    box-sizing: border-box;
}

.beyond-page a {
    color: inherit;
}

.beyond-nav {
    background: var(--beyond-nav-background);
    border-bottom: 1px solid var(--beyond-line);
    position: sticky;
    top: 0;
    z-index: 20;
}

.beyond-nav-inner,
.beyond-shell {
    margin: 0 auto;
    max-width: 1080px;
    padding-left: 2rem;
    padding-right: 2rem;
}

.beyond-nav-inner {
    align-items: center;
    display: flex;
    justify-content: space-between;
    min-height: 58px;
}

.beyond-brand {
    font-family: "Raleway", sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
}

.beyond-nav nav {
    align-items: center;
    display: flex;
    gap: 1.25rem;
}

.beyond-nav .theme-toggle {
    align-items: center;
    background: transparent;
    border: 0;
    color: var(--beyond-ink);
    cursor: pointer;
    display: inline-flex;
    height: 1.9rem;
    justify-content: center;
    margin-left: 0.1rem;
    padding: 0;
    transition: background-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
    width: 1.9rem;
}

.beyond-nav .theme-toggle:hover,
.beyond-nav .theme-toggle:focus {
    color: var(--beyond-accent);
    outline: 0;
    transform: translateY(-1px);
}

.beyond-nav .theme-toggle:focus-visible {
    outline: 2px solid var(--beyond-line);
    outline-offset: 2px;
}

.beyond-nav .theme-toggle-icon {
    height: 1rem;
    width: 1rem;
}

.beyond-nav .theme-toggle-icon-sun,
html[data-theme="dark"] .beyond-nav .theme-toggle-icon-moon {
    display: none;
}

html[data-theme="dark"] .beyond-nav .theme-toggle-icon-sun {
    display: block;
}

.beyond-nav .theme-toggle-text {
    clip: rect(0, 0, 0, 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    position: absolute;
    width: 1px;
}

.beyond-nav nav a {
    color: var(--beyond-muted);
    font-size: 0.92rem;
    text-decoration: none;
}

.beyond-nav nav a:hover,
.beyond-nav nav a:focus,
.beyond-nav nav a.is-active {
    color: var(--beyond-ink);
    font-weight: 700;
}

.beyond-hero {
    border-bottom: 1px solid var(--beyond-line);
    padding: 4.2rem 0 2.8rem;
}

.beyond-kicker {
    color: var(--beyond-accent);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    margin: 0 0 0.8rem;
    text-transform: uppercase;
}

.beyond-hero h1 {
    font-size: clamp(2.4rem, 5.5vw, 4.1rem);
    letter-spacing: -0.045em;
    line-height: 1.03;
    margin: 0;
    max-width: 900px;
}

.beyond-description {
    color: var(--beyond-muted);
    font-size: clamp(1.04rem, 2vw, 1.28rem);
    line-height: 1.55;
    margin: 1.2rem 0 0;
    max-width: 700px;
}

.beyond-meta {
    border-bottom: 1px solid var(--beyond-line);
}

.beyond-meta-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding-bottom: 1.35rem;
    padding-top: 1.35rem;
}

.beyond-meta-grid > div > span {
    color: var(--beyond-muted);
    display: block;
    font-size: 0.69rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    margin-bottom: 0.38rem;
    text-transform: uppercase;
}

.beyond-meta strong {
    color: var(--beyond-ink);
    font-size: 0.92rem;
    font-weight: 700;
    line-height: 1.35;
}

.beyond-meta-status span {
    color: var(--beyond-ink);
    display: block;
    font: inherit;
    letter-spacing: normal;
    margin: 0;
    text-transform: none;
}

.beyond-content {
    display: grid;
    gap: 3rem;
    grid-template-columns: 185px minmax(0, 1fr);
    padding-bottom: 5rem;
    padding-top: 2.2rem;
}

.beyond-toc {
    align-self: start;
    border-right: 1px solid var(--beyond-line);
    display: flex;
    flex-direction: column;
    gap: 0.74rem;
    padding-right: 1.5rem;
    position: sticky;
    top: 85px;
}

.beyond-toc h2 {
    font-size: 1.08rem;
    margin: 0 0 0.7rem;
}

.beyond-toc a {
    color: var(--beyond-ink);
    font-size: 0.8rem;
    font-weight: 700;
    line-height: 1.25;
    text-decoration: none;
}

.beyond-toc a:hover,
.beyond-toc a:focus {
    color: var(--beyond-accent);
}

.beyond-toc-group {
    display: grid;
    gap: 0.5rem;
}

.beyond-toc-group-heading {
    align-items: center;
    display: flex;
    gap: 0.45rem;
    justify-content: space-between;
}

.beyond-toc-toggle {
    background: transparent;
    border: 0;
    color: var(--beyond-muted);
    cursor: pointer;
    font: 700 1rem/1 Lato, sans-serif;
    padding: 0.1rem 0.2rem;
}

.beyond-toc-toggle:hover,
.beyond-toc-toggle:focus-visible {
    color: var(--beyond-accent);
}

.beyond-toc-subsections {
    display: grid;
    gap: 0.42rem;
    padding-left: 0.75rem;
}

.beyond-toc-subsections[hidden] {
    display: none;
}

.beyond-toc-subsections a {
    color: var(--beyond-muted);
    font-size: 0.72rem;
    font-weight: 400;
}

.beyond-article {
    max-width: 760px;
}

.beyond-article > h2 {
    border-bottom: 1px solid var(--beyond-line);
    font-size: clamp(1.8rem, 4vw, 2.35rem);
    letter-spacing: -0.035em;
    line-height: 1.08;
    margin: 4.2rem 0 1.25rem;
    padding-bottom: 0.9rem;
}

.beyond-article > h2:first-child {
    margin-top: 0;
}

.beyond-article h3 {
    font-size: 1.22rem;
    margin: 2.3rem 0 0.75rem;
}

.beyond-article p,
.beyond-article li {
    font-size: 1.02rem;
    line-height: 1.72;
}

.beyond-article strong {
    color: var(--beyond-accent);
}

.beyond-article .katex {
    color: inherit;
    font-size: 1em;
}

.beyond-article .katex-display {
    margin: 1.25rem 0;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.15rem 0;
}

.beyond-article .katex-display > .katex {
    font-size: 1.05em;
}

.beyond-article table {
    border-collapse: collapse;
    display: block;
    font-size: 0.88rem;
    margin: 1.35rem 0;
    max-width: 100%;
    overflow-x: auto;
    white-space: nowrap;
}

.beyond-article th,
.beyond-article td {
    border-bottom: 1px solid var(--beyond-line);
    padding: 0.55rem 0.8rem;
    text-align: right;
}

.beyond-article th:first-child,
.beyond-article td:first-child {
    text-align: left;
}

.basin-takeaway {
    background: var(--beyond-paper);
    border: 1px solid var(--beyond-line);
    border-left: 3px solid var(--beyond-accent);
    border-radius: 0.65rem;
    margin: 1.4rem 0 2.4rem;
    padding: 1.35rem;
}

.basin-takeaway > p {
    margin-top: 0;
}

.basin-metrics {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin: 1.2rem 0 0;
}

.basin-metrics div {
    border-left: 1px solid var(--beyond-line);
    padding-left: 0.8rem;
}

.basin-metrics dt {
    color: var(--beyond-muted);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.basin-metrics dd {
    color: var(--beyond-accent);
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0.3rem 0 0;
}

.article-figure-placeholder {
    background: linear-gradient(135deg, var(--beyond-paper), color-mix(in srgb, var(--beyond-paper) 82%, var(--beyond-line)));
    border: 1px dashed var(--beyond-line);
    border-radius: 0.65rem;
    margin: 1.6rem 0;
    padding: 1.25rem 1.35rem;
}

.article-figure-placeholder p {
    color: var(--beyond-muted);
    font-size: 0.88rem;
    line-height: 1.55;
    margin: 0;
}

.article-figure-placeholder .article-figure-label {
    color: var(--beyond-accent);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    margin-bottom: 0.45rem;
    text-transform: uppercase;
}

.interactive-demo section {
    margin-bottom: 4.2rem;
    scroll-margin-top: 88px;
}

.interactive-demo h2 {
    border-bottom: 1px solid var(--beyond-line);
    font-size: clamp(1.8rem, 4vw, 2.35rem);
    letter-spacing: -0.035em;
    line-height: 1.08;
    margin: 0 0 1.25rem;
    padding-bottom: 0.9rem;
}

.interactive-demo p {
    font-size: 1.02rem;
    line-height: 1.72;
    margin: 0 0 1.15rem;
}

.demo-panel {
    background: var(--beyond-paper);
    border: 1px solid var(--beyond-line);
    border-radius: 0.8rem;
    margin-top: 1.4rem;
    overflow: hidden;
    padding: 1.35rem;
}

.demo-panel-dark {
    background: var(--beyond-panel);
    border: 0;
    color: var(--beyond-cream);
    padding: 0;
    position: relative;
}

.physics-controls {
    background: var(--beyond-control-background);
    border: 1px solid var(--beyond-control-border);
    border-radius: 0.7rem;
    display: grid;
    gap: 0.7rem;
    left: 1.1rem;
    max-width: 285px;
    padding: 1.05rem;
    position: absolute;
    top: 1.1rem;
    z-index: 2;
}

.demo-label {
    font-size: 1.12rem !important;
    font-weight: 700;
    margin-bottom: 0.1rem !important;
}

.demo-hint {
    color: var(--beyond-oat);
    font-size: 0.77rem !important;
    line-height: 1.35 !important;
    margin-bottom: 0 !important;
}

.physics-controls label,
.demo-range {
    align-items: center;
    display: grid;
    font-size: 0.8rem;
    font-weight: 700;
    gap: 0.35rem;
}

.physics-controls input,
.demo-range input {
    accent-color: var(--beyond-accent);
    width: 100%;
}

.interactive-demo button {
    background: transparent;
    border: 1px solid currentColor;
    border-radius: 0.35rem;
    color: inherit;
    cursor: pointer;
    font: inherit;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 0.5rem 0.65rem;
}

.interactive-demo button:hover,
.interactive-demo button:focus {
    background: var(--beyond-accent);
    border-color: var(--beyond-accent);
    color: var(--beyond-cream);
}

[data-physics-canvas] {
    cursor: crosshair;
    display: block;
    height: auto;
    min-height: 390px;
    touch-action: none;
    width: 100%;
}

.figure-caption,
.demo-readout,
.demo-citation-count {
    color: var(--beyond-muted);
    font-size: 0.82rem !important;
    text-align: center;
}

.demo-motion {
    align-items: center;
    background: linear-gradient(135deg, var(--beyond-panel), var(--beyond-accent));
    border-radius: 0.8rem;
    display: flex;
    gap: 0.65rem;
    justify-content: center;
    margin-top: 1.35rem;
    min-height: 230px;
    overflow: hidden;
    padding: 2rem;
}

.demo-motion span {
    animation: demo-pulse 2.8s ease-in-out infinite;
    background: linear-gradient(135deg, var(--beyond-cognac), var(--beyond-brass));
    border-radius: 0.3rem;
    box-shadow: 0 0 2.5rem var(--beyond-glow);
    display: block;
    height: 62px;
    transform: rotate(45deg);
    width: 62px;
}

.demo-motion span:nth-child(2) { animation-delay: 0.18s; }
.demo-motion span:nth-child(3) { animation-delay: 0.36s; }
.demo-motion span:nth-child(4) { animation-delay: 0.54s; }
.demo-motion span:nth-child(5) { animation-delay: 0.72s; }

.demo-range {
    color: var(--beyond-ink);
    margin-bottom: 1rem;
}

[data-tangent-plot],
[data-force-graph] {
    display: block;
    height: auto;
    touch-action: none;
    width: 100%;
}

.demo-graph-actions {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 0.7rem;
}

.demo-static-visual {
    background: var(--beyond-paper);
    border: 1px solid var(--beyond-line);
    border-radius: 0.8rem;
    display: grid;
    gap: 1rem;
    margin-top: 1.4rem;
    padding: clamp(1.4rem, 5vw, 2.6rem);
}

.demo-static-title {
    color: var(--beyond-accent);
    font-family: "Raleway", sans-serif;
    font-size: clamp(1.3rem, 4vw, 2.1rem);
    font-weight: 700;
    text-align: center;
}

.demo-static-row {
    display: flex;
    gap: 0.55rem;
    justify-content: center;
}

.demo-static-row.is-shifted {
    transform: translateX(7%);
}

.demo-static-row span {
    background: linear-gradient(135deg, var(--beyond-cognac), var(--beyond-oat));
    border-radius: 0.25rem;
    display: block;
    height: clamp(24px, 7vw, 46px);
    width: clamp(24px, 7vw, 46px);
}

.demo-static-row:nth-of-type(3) span { background: linear-gradient(135deg, var(--beyond-brass), var(--beyond-oat)); }
.demo-static-row:nth-of-type(4) span { background: linear-gradient(135deg, var(--beyond-clay), var(--beyond-cognac)); }

.demo-equation {
    background: var(--beyond-paper);
    border-left: 3px solid var(--beyond-accent);
    margin-top: 1.3rem;
    overflow-x: auto;
    padding: 1.5rem;
    text-align: center;
}

.interactive-demo pre {
    background: var(--beyond-panel);
    border-radius: 0.6rem;
    color: var(--beyond-cream);
    font-size: 0.84rem;
    line-height: 1.55;
    margin: 1.3rem 0 0;
    overflow-x: auto;
    padding: 1.3rem;
}

.demo-resource-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.demo-resource-links a {
    color: var(--beyond-accent);
    font-weight: 700;
}

@keyframes demo-pulse {
    0%, 100% { opacity: 0.38; transform: rotate(45deg) scale(0.75); }
    45% { opacity: 1; transform: rotate(45deg) scale(1.12); }
}

@media (max-width: 760px) {
    .beyond-nav-inner,
    .beyond-shell {
        padding-left: 1.15rem;
        padding-right: 1.15rem;
    }

    .beyond-nav-inner {
        align-items: flex-start;
        flex-direction: column;
        gap: 0.65rem;
        padding-bottom: 0.8rem;
        padding-top: 0.8rem;
    }

    .beyond-nav nav {
        gap: 1rem;
    }

    .beyond-hero {
        padding: 3rem 0 2rem;
    }

    .beyond-meta-grid {
        gap: 1.1rem;
        grid-template-columns: 1fr;
    }

    .beyond-content {
        display: block;
        padding-top: 1.5rem;
    }

    .beyond-toc {
        border-bottom: 1px solid var(--beyond-line);
        border-right: 0;
        display: grid;
        gap: 0.65rem 1rem;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        margin-bottom: 2rem;
        padding-bottom: 1.35rem;
        padding-right: 0;
        position: static;
    }

    .beyond-toc h2 {
        grid-column: 1 / -1;
        margin-bottom: 0.1rem;
    }

    .basin-metrics {
        grid-template-columns: 1fr;
    }

    .physics-controls {
        left: 0.8rem;
        max-width: calc(100% - 1.6rem);
        right: 0.8rem;
        top: 0.8rem;
    }

    [data-physics-canvas] {
        min-height: 520px;
    }
}

@media (max-width: 460px) {
    .beyond-nav nav {
        gap: 0.75rem;
    }

    .beyond-nav nav a {
        font-size: 0.82rem;
    }

    .beyond-toc {
        grid-template-columns: 1fr;
    }

    .demo-motion {
        gap: 0.35rem;
        min-height: 175px;
    }

    .demo-motion span {
        height: 42px;
        width: 42px;
    }
}