/* graphers.net — observatory of structure
   palette: graphite #0F1418 / vellum #E8E2D1 / folio shadow #3A3F4A
            brass #C6A15B / cyan #7BA8B8 / carmine #B85C4A
            fog #5C6470 / deep folio #1A1F26
   typography: Cardo (body) / Fraunces (display) / Caveat (marginalia)
              JetBrains Mono ~ iA Writer Mono S substitute (numerical) */

:root {
    --graphite: #0F1418;
    --vellum: #E8E2D1;
    --folio: #3A3F4A;
    --brass: #C6A15B;
    --cyan: #7BA8B8;
    --carmine: #B85C4A;
    --fog: #5C6470;
    --deep-folio: #1A1F26;

    --font-body: 'Cardo', 'Times New Roman', serif;
    --font-display: 'Fraunces', 'Cardo', serif;
    --font-margin: 'Caveat', cursive;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    --col: 32px;
    --gutter: 16px;
    --margin-w: 96px;
    --vignette: 220px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    background: var(--graphite);
    color: var(--vellum);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.68;
    letter-spacing: -0.003em;
    overflow-x: hidden;
    min-height: 100%;
}

body {
    position: relative;
    padding-left: var(--margin-w);
    padding-right: 32px;
    padding-bottom: 0;
}

em, i {
    font-style: italic;
    color: var(--vellum);
}

strong, b {
    font-weight: 700;
}

a {
    color: var(--cyan);
    text-decoration: none;
    border-bottom: 1px dotted var(--cyan);
}

a:hover {
    color: var(--brass);
    border-bottom-color: var(--brass);
}

button {
    font-family: inherit;
    background: transparent;
    border: 1px solid var(--folio);
    color: var(--vellum);
    cursor: pointer;
}

table {
    border-collapse: collapse;
    width: 100%;
}

ul, ol {
    list-style: none;
}

/* generative grain canvas */
#grain-bg {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    opacity: 0.85;
}

/* micrometer header — upper right metadata */
.micrometer {
    position: fixed;
    top: 24px;
    right: 260px;
    z-index: 12;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
    font-family: var(--font-mono);
    font-size: 12.5px;
    letter-spacing: 0.04em;
    color: var(--fog);
    font-weight: 400;
    pointer-events: none;
}

.micrometer .meta-line:first-child {
    color: var(--vellum);
}

/* sticky reading margin (left edge, 96px wide) */
.ruler {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--margin-w);
    height: 100vh;
    z-index: 11;
    padding: 24px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    pointer-events: none;
}

.ruler-rule {
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    width: 1px;
    background: var(--folio);
}

.ruler-coord {
    font-family: var(--font-mono);
    font-size: 12.5px;
    letter-spacing: 0.04em;
    color: var(--brass);
    margin-bottom: 28px;
    margin-top: 8px;
    transition: color 320ms cubic-bezier(0.65, 0.05, 0.36, 1);
}

.ruler-minimap-wrap {
    width: 72px;
    pointer-events: auto;
}

.ruler-minimap-label {
    font-family: var(--font-mono);
    font-size: 9.5px;
    letter-spacing: 0.06em;
    text-transform: lowercase;
    color: var(--fog);
    margin-bottom: 6px;
    text-align: center;
}

.ruler-minimap {
    width: 72px;
    height: 108px;
    display: block;
    cursor: crosshair;
}

.ruler-minimap circle.mini-vertex {
    cursor: pointer;
    pointer-events: auto;
}

.ruler-minimap circle.mini-vertex.is-current {
    fill: var(--brass);
    stroke: var(--brass);
}

.ruler-minimap circle.mini-vertex.is-visited {
    stroke: var(--brass);
}

.ruler-minimap .mini-position {
    fill: var(--brass);
    filter: drop-shadow(0 0 2px var(--brass));
}

.ruler-minimap .mini-path {
    fill: none;
    stroke: var(--brass);
    stroke-width: 0.7;
    opacity: 0.85;
}

.ruler-marginalia {
    margin-top: 22px;
    width: 80px;
    font-family: var(--font-margin);
    font-size: 14px;
    color: var(--vellum);
    line-height: 1.32;
    text-align: left;
    transform: rotate(-1.4deg);
    transform-origin: left top;
    pointer-events: none;
    opacity: 0.92;
    min-height: 84px;
    transition: opacity 320ms ease;
}

/* upper-right vignette: site-graph menu */
.menu-graph-vignette {
    position: fixed;
    top: 24px;
    right: 24px;
    width: var(--vignette);
    height: var(--vignette);
    z-index: 14;
}

.menu-graph-vignette .vignette-label {
    position: absolute;
    top: -18px;
    left: 4px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--fog);
    text-transform: lowercase;
}

#menu-graph {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: radial-gradient(circle at 50% 50%, rgba(26, 31, 38, 0.65) 0%, rgba(15, 20, 24, 0.0) 78%);
    overflow: visible;
}

#menu-graph .menu-edge {
    stroke: var(--cyan);
    stroke-width: 0.9;
    fill: none;
    opacity: 0.55;
}

#menu-graph .menu-vertex {
    cursor: pointer;
    transition: fill 240ms ease, stroke 240ms ease, r 240ms ease;
}

#menu-graph .menu-vertex.is-current {
    fill: var(--brass);
    stroke: var(--brass);
}

#menu-graph .menu-vertex.is-visited {
    fill: transparent;
    stroke: var(--brass);
}

#menu-graph .menu-vertex.is-unvisited {
    fill: transparent;
    stroke: var(--vellum);
}

#menu-graph .menu-path-trace {
    fill: none;
    stroke: var(--brass);
    stroke-width: 1.1;
    stroke-linecap: round;
    opacity: 0.88;
}

.vignette-tip {
    position: absolute;
    bottom: -22px;
    right: 0;
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.06em;
    color: var(--vellum);
    background: var(--deep-folio);
    padding: 3px 6px;
    border: 1px solid var(--folio);
    opacity: 0;
    transition: opacity 220ms ease;
    pointer-events: none;
    white-space: nowrap;
}

.vignette-tip.is-visible {
    opacity: 1;
}

/* main atlas — page layout */
.atlas {
    position: relative;
    z-index: 2;
    max-width: 880px;
    margin: 0 auto;
    padding: 120px 40px 80px;
}

/* edges svg layer — drawn on top of atlas */
.page-edges {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    pointer-events: none;
    overflow: visible;
}

.page-edges .edge {
    fill: none;
    stroke: var(--cyan);
    stroke-width: 1.0;
    opacity: 0.78;
    transition: stroke 320ms cubic-bezier(0.65, 0.05, 0.36, 1),
                stroke-width 320ms cubic-bezier(0.65, 0.05, 0.36, 1),
                opacity 320ms cubic-bezier(0.65, 0.05, 0.36, 1);
}

.page-edges .edge.is-implies {
    stroke-dasharray: 4 3;
}

.page-edges .edge.is-speculates {
    stroke-dasharray: 1 2.5;
}

.page-edges .edge.is-active {
    stroke: var(--brass);
    stroke-width: 1.6;
    opacity: 1;
}

.page-edges .edge.is-errata {
    stroke: var(--carmine);
}

.page-edges .ephemeral-edge {
    fill: none;
    stroke: var(--cyan);
    stroke-width: 0.9;
    opacity: 0.6;
    pointer-events: none;
}

/* ego hero — landing */
.ego-hero {
    position: relative;
    min-height: 720px;
    margin-bottom: 200px;
    padding-top: 24px;
}

.hero-coord {
    font-family: var(--font-mono);
    font-size: 12.5px;
    letter-spacing: 0.04em;
    color: var(--fog);
    margin-bottom: 28px;
}

.display-curve {
    font-family: var(--font-display);
    font-weight: 300;
    font-variation-settings: "opsz" 144, "SOFT" 100, "WONK" 1;
    font-size: clamp(2.6rem, 5.4vw, 4.4rem);
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--vellum);
    margin-bottom: 24px;
    display: inline-block;
    white-space: nowrap;
    transform-origin: left center;
}

.display-curve span {
    display: inline-block;
    transform-origin: 50% 80%;
    transition: transform 600ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.hero-prose {
    max-width: 540px;
    font-size: 17px;
    line-height: 1.68;
    color: var(--vellum);
    margin-bottom: 32px;
}

.ego-canvas {
    width: 100%;
    height: 540px;
    display: block;
    margin: 16px 0 24px;
    overflow: visible;
}

.ego-canvas .ego-edge {
    fill: none;
    stroke: var(--cyan);
    stroke-width: 1.1;
    opacity: 0.85;
    stroke-linecap: round;
}

.ego-canvas .ego-vertex-disc {
    fill: var(--deep-folio);
    stroke: var(--vellum);
    stroke-width: 1.25;
    transition: stroke 320ms ease, transform 320ms ease;
    filter: drop-shadow(0 1px 0 rgba(0,0,0,0.18));
}

.ego-canvas .ego-vertex-disc.is-you {
    cursor: pointer;
    stroke: var(--brass);
}

.ego-canvas .ego-vertex-disc.is-you-pulse {
    transform-origin: center;
    transform-box: fill-box;
    animation: youPulse 4s ease-in-out infinite;
}

.ego-canvas .ego-vertex-label {
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 14px;
    fill: var(--vellum);
    text-anchor: middle;
    dominant-baseline: middle;
    pointer-events: none;
}

.ego-canvas .ego-vertex-coord {
    font-family: var(--font-mono);
    font-size: 9.5px;
    fill: var(--fog);
    text-anchor: middle;
    letter-spacing: 0.06em;
}

@keyframes youPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.003); }
}

.hero-footnote {
    font-family: var(--font-body);
    font-style: italic;
    color: var(--fog);
    font-size: 14.5px;
    line-height: 1.55;
    max-width: 480px;
    margin-top: 12px;
}

.hero-footnote .dingbat {
    color: var(--brass);
    font-style: normal;
    margin-right: 4px;
}

/* vertex section base */
.vertex {
    position: relative;
    padding: 56px 0 56px 0;
    margin-bottom: 96px;
    transition: opacity 320ms ease;
    --left-edge: 0;
}

.vertex:nth-child(odd) {
    margin-left: 6%;
    margin-right: -6%;
}

.vertex:nth-child(even) {
    margin-left: -2%;
    margin-right: 2%;
}

.vertex-marker {
    position: absolute;
    top: 56px;
    left: -180px;
    width: 110px;
    color: var(--vellum);
    text-align: left;
}

.vertex-marker .margin-thumb {
    width: 64px;
    height: 64px;
    display: block;
    margin-bottom: 6px;
    opacity: 0.92;
}

.vertex-marker .margin-caption {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 12px;
    line-height: 1.36;
    color: var(--vellum);
    opacity: 0.78;
    max-width: 110px;
}

.vertex-marker .margin-caption.errata-caption {
    color: var(--carmine);
    opacity: 1;
}

.vertex-disc {
    width: 56px;
    height: 56px;
    margin-bottom: 18px;
}

.vertex-disc svg {
    width: 100%;
    height: 100%;
    display: block;
    overflow: visible;
}

.vertex-disc svg circle {
    transition: stroke 320ms cubic-bezier(0.65, 0.05, 0.36, 1),
                stroke-width 320ms cubic-bezier(0.65, 0.05, 0.36, 1);
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.18));
}

.vertex.is-active .vertex-disc svg circle {
    stroke: var(--brass);
    stroke-width: 1.6;
}

.vertex.is-visited .vertex-disc svg circle {
    stroke: var(--brass);
    stroke-width: 1.25;
    opacity: 0.7;
}

.vertex.errata .vertex-disc svg circle {
    stroke: var(--carmine);
}

.vertex-name {
    font-family: var(--font-display);
    font-variation-settings: "opsz" 144, "SOFT" 100, "WONK" 1;
    font-weight: 300;
    font-size: clamp(2.0rem, 3.6vw, 2.9rem);
    color: var(--vellum);
    line-height: 1.05;
    letter-spacing: -0.02em;
    margin-bottom: 22px;
    text-transform: lowercase;
}

.vertex.is-active .vertex-name {
    color: var(--brass);
}

.vertex .errata-flag {
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.08em;
    color: var(--carmine);
    background: rgba(184, 92, 74, 0.08);
    border: 1px solid var(--carmine);
    padding: 2px 6px;
    margin-left: 12px;
    text-transform: lowercase;
    vertical-align: middle;
    font-weight: 400;
}

.vertex-prose {
    max-width: 580px;
    font-size: 17px;
    line-height: 1.68;
    color: var(--vellum);
    margin-bottom: 18px;
}

.vertex-prose.errata-prose {
    border-left: 2px solid var(--carmine);
    padding-left: 16px;
    color: var(--vellum);
}

.vertex-prose.errata-prose em {
    color: var(--carmine);
}

.vertex-list {
    max-width: 580px;
    margin: 12px 0 4px;
}

.vertex-list li {
    font-size: 16px;
    line-height: 1.68;
    padding-left: 22px;
    position: relative;
    margin-bottom: 6px;
}

.vertex-list li::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 12px;
    width: 6px;
    height: 6px;
    border: 1px solid var(--vellum);
    border-radius: 50%;
    background: var(--deep-folio);
}

.incidence-table {
    max-width: 480px;
    margin: 18px 0 4px;
    font-family: var(--font-mono);
    font-size: 12.5px;
    letter-spacing: 0.04em;
    color: var(--vellum);
}

.incidence-table th {
    text-align: left;
    color: var(--fog);
    font-weight: 400;
    text-transform: lowercase;
    padding: 8px 18px 8px 0;
    border-bottom: 1px solid var(--folio);
}

.incidence-table td {
    padding: 6px 18px 6px 0;
    border-bottom: 1px dotted var(--folio);
}

.incidence-table .errata-cell {
    color: var(--carmine);
}

.girth-glyph {
    margin-top: 24px;
    width: 96px;
    height: 96px;
    opacity: 0.5;
}

.girth-glyph svg {
    width: 100%;
    height: 100%;
    display: block;
}

.vertex-caveat {
    font-family: var(--font-margin);
    font-size: 18px;
    color: var(--vellum);
    opacity: 0.78;
    transform: rotate(-1.6deg);
    margin-top: 14px;
    max-width: 320px;
}

.vertex.orphan {
    margin-top: 64px;
    margin-left: auto;
    margin-right: 0;
    text-align: left;
    max-width: 460px;
    padding-bottom: 120px;
}

.vertex.orphan .vertex-disc {
    width: 32px;
    height: 32px;
    opacity: 0.85;
}

.vertex.orphan .vertex-name {
    font-size: clamp(1.6rem, 2.6vw, 2.2rem);
    color: var(--fog);
}

/* footer — force-directed snowfall */
.snowfall-footer {
    position: relative;
    z-index: 5;
    margin-top: 80px;
    padding: 40px 24px 64px;
    border-top: 1px solid var(--folio);
    background: linear-gradient(180deg, transparent 0%, rgba(26, 31, 38, 0.35) 100%);
}

.footer-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.06em;
    color: var(--fog);
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.ambience-toggle {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.06em;
    background: transparent;
    color: var(--fog);
    border: 1px solid var(--folio);
    padding: 5px 10px;
    cursor: pointer;
    transition: color 220ms ease, border-color 220ms ease;
}

.ambience-toggle:hover,
.ambience-toggle.is-on {
    color: var(--brass);
    border-color: var(--brass);
}

.footer-graph {
    width: 100%;
    height: 600px;
    display: block;
    overflow: visible;
}

.footer-graph .footer-edge {
    stroke: var(--cyan);
    stroke-width: 0.7;
    opacity: 0.4;
    fill: none;
}

.footer-graph .footer-vertex {
    fill: var(--deep-folio);
    stroke: var(--vellum);
    stroke-width: 1;
    cursor: pointer;
    transition: stroke 240ms ease, fill 240ms ease;
}

.footer-graph .footer-vertex:hover {
    stroke: var(--brass);
}

.footer-graph .footer-label {
    font-family: var(--font-body);
    font-size: 12.5px;
    fill: var(--vellum);
    text-anchor: middle;
    pointer-events: none;
    opacity: 0.85;
}

.footer-rule {
    height: 1px;
    background: var(--folio);
    margin: 24px 0 16px;
}

.footer-colophon {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.06em;
    color: var(--fog);
    text-transform: lowercase;
}

/* responsive — collapse marginalia at narrow viewports */
@media (max-width: 1100px) {
    .vertex-marker {
        position: relative;
        top: 0;
        left: 0;
        margin-bottom: 12px;
        display: flex;
        align-items: flex-start;
        gap: 14px;
        max-width: 460px;
    }
    .vertex-marker .margin-thumb {
        flex-shrink: 0;
    }
    .vertex-marker .margin-caption {
        max-width: 280px;
        padding-top: 6px;
    }
}

@media (max-width: 860px) {
    body {
        padding-left: 64px;
        padding-right: 16px;
    }
    .ruler {
        width: 64px;
        padding: 16px 6px;
    }
    .ruler-minimap-wrap {
        display: none;
    }
    .ruler-marginalia {
        display: none;
    }
    .menu-graph-vignette {
        width: 140px;
        height: 140px;
        top: 16px;
        right: 16px;
    }
    .micrometer {
        right: 168px;
        font-size: 10.5px;
    }
    .atlas {
        padding: 96px 16px 60px;
    }
    .vertex {
        margin-bottom: 64px;
    }
    .vertex:nth-child(odd),
    .vertex:nth-child(even) {
        margin-left: 0;
        margin-right: 0;
    }
    .ego-canvas {
        height: 380px;
    }
    .footer-graph {
        height: 420px;
    }
}

@media (max-width: 560px) {
    .micrometer {
        position: relative;
        right: auto;
        top: auto;
        align-items: flex-start;
        padding: 16px 16px 0;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px 14px;
    }
    body {
        padding-left: 48px;
    }
    .ruler {
        width: 48px;
    }
    .menu-graph-vignette {
        width: 110px;
        height: 110px;
    }
    .vertex-name {
        font-size: 1.7rem;
    }
}