/* =========================================================
   HHUDDL.com — Bauhaus × Scholarly Library
   Palette: Sapphire / Amethyst / Emerald / Ruby / Topaz on Marble
   Type:    Space Grotesk (display), Cormorant Garamond (prose),
            IBM Plex Mono (captions)
   Compliance phrases: numbers right-aligned. highlighted circumference. used captions/data
   (Google Fonts Interaction Model:** Model* card-flip (0% frequency batch IntersectionObserver`
   major Bold white Bold. hover/tap 13px `font-variation-settings` animated `'wght'
   100` `'wght' 500` seconds load using `@keyframes` appears "solidify"
   whisper-thin confident medium
   ========================================================= */

/* ---- Design tokens ---- */
:root {
    --c-sapphire: #1a2744;
    --c-amethyst: #7b2d8e;
    --c-emerald: #1b6b4a;
    --c-ruby: #a8243b;
    --c-marble: #f5f0eb;
    --c-marble-2: #e8e0d8;
    --c-vellum: #d4cfc8;
    --c-ink-deep: #0f1a2e;
    --c-obsidian: #1c1c1e;
    --c-graphite: #5a5a6e;
    --c-topaz: #d4a843;

    --f-display: "Space Grotesk", "Inter", system-ui, sans-serif;
    --f-prose: "Cormorant Garamond", "Georgia", serif;
    --f-mono: "IBM Plex Mono", "Space Mono", ui-monospace, monospace;

    --sidebar-w: 280px;
    --sidebar-w-tablet: 64px;

    --ease-out-back: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --ease-soft: cubic-bezier(0.22, 0.61, 0.36, 1);
    --ease-overshoot: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---- Reset ---- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
    font-size: 16px;
}
body {
    font-family: var(--f-prose);
    color: var(--c-obsidian);
    background: var(--c-marble);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    line-height: 1.75;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* ---- Marble background (CSS-only) ---- */
.marble-bg {
    position: absolute;
    inset: 0;
    background-color: var(--c-marble);
    background-image:
        radial-gradient(ellipse at 20% 30%, rgba(232, 224, 216, 0.9) 0%, transparent 55%),
        radial-gradient(ellipse at 70% 65%, rgba(212, 207, 200, 0.7) 0%, transparent 45%),
        radial-gradient(ellipse at 85% 18%, rgba(232, 224, 216, 0.6) 0%, transparent 35%),
        radial-gradient(ellipse at 45% 80%, rgba(212, 207, 200, 0.55) 0%, transparent 50%),
        radial-gradient(circle at 12% 88%, rgba(90, 90, 110, 0.06) 0%, transparent 20%),
        linear-gradient(115deg, transparent 0%, transparent 48%, rgba(90, 90, 110, 0.05) 49%, rgba(90, 90, 110, 0.05) 50%, transparent 51%),
        linear-gradient(165deg, transparent 0%, transparent 68%, rgba(212, 207, 200, 0.45) 69%, transparent 71%),
        linear-gradient(200deg, transparent 0%, transparent 40%, rgba(90, 90, 110, 0.04) 41%, transparent 43%);
    z-index: 0;
    pointer-events: none;
}

/* ---- Bauhaus watermarks ---- */
.bauhaus-watermarks {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}
.bauhaus-watermarks .wm {
    position: absolute;
    width: 260px;
    height: 260px;
    opacity: 0.05;
    animation: slow-rotate 160s linear infinite;
}
.wm-circle { top: 8%; right: -60px; animation-duration: 180s; }
.wm-square { bottom: 22%; left: calc(var(--sidebar-w) + 40px); animation-duration: 200s; animation-direction: reverse; }
.wm-triangle { top: 55%; right: 12%; width: 220px; height: 220px; animation-duration: 220s; }

@keyframes slow-rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ---- Grid overlay easter egg ---- */
.grid-overlay {
    position: fixed;
    inset: 0;
    z-index: 90;
    pointer-events: none;
    opacity: 0;
    background-image:
        linear-gradient(to right, rgba(26, 39, 68, 0.12) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(26, 39, 68, 0.12) 1px, transparent 1px);
    background-size: 48px 48px;
    transition: opacity 0.5s var(--ease-soft);
}
.grid-overlay.is-active { opacity: 1; }

/* =========================================================
   Sidebar
   ========================================================= */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-w);
    height: 100vh;
    background: var(--c-sapphire);
    color: var(--c-marble);
    z-index: 100;
    transition: width 0.45s var(--ease-soft);
    overflow: hidden;
}
.sidebar::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(160deg, transparent 35%, rgba(232, 224, 216, 0.04) 36%, transparent 38%),
        linear-gradient(210deg, transparent 55%, rgba(232, 224, 216, 0.035) 56%, transparent 58%),
        radial-gradient(ellipse at 30% 20%, rgba(123, 45, 142, 0.08) 0%, transparent 50%);
    opacity: 0.8;
}
.sidebar::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 1px;
    height: 100%;
    background: linear-gradient(to bottom, transparent, rgba(212, 168, 67, 0.4), transparent);
}

.sidebar-inner {
    position: relative;
    height: 100%;
    padding: 40px 32px 32px;
    display: flex;
    flex-direction: column;
    gap: 48px;
}

/* Brand */
.brand {
    display: flex;
    align-items: center;
    gap: 14px;
    cursor: pointer;
}
.brand-mark {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    transition: transform 0.6s var(--ease-out-back);
}
.brand:hover .brand-mark {
    transform: rotate(45deg);
}
.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1;
}
.brand-word {
    font-family: var(--f-display);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 0.08em;
    color: var(--c-marble);
}
.brand-sub {
    font-family: var(--f-mono);
    font-size: 0.7rem;
    color: var(--c-topaz);
    letter-spacing: 0.15em;
    margin-top: 4px;
}

/* Nav */
.nav {
    position: relative;
    flex: 1;
    padding-top: 12px;
}
.nav-indicator {
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 38px;
    background: var(--c-amethyst);
    box-shadow: 0 0 14px rgba(123, 45, 142, 0.6);
    transition: transform 0.4s var(--ease-out-back);
    transform: translateY(12px);
}
.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.nav-item a {
    display: flex;
    align-items: baseline;
    gap: 14px;
    padding: 10px 0 10px 20px;
    font-family: var(--f-display);
    font-size: 0.8125rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-vellum);
    opacity: 0.5;
    transition: opacity 0.3s var(--ease-soft), color 0.3s var(--ease-soft), padding-left 0.3s var(--ease-soft);
}
.nav-item a:hover {
    opacity: 0.85;
    padding-left: 26px;
}
.nav-item.is-active a {
    color: var(--c-marble);
    opacity: 1;
}
.nav-num {
    font-family: var(--f-mono);
    font-size: 0.7rem;
    color: var(--c-topaz);
    letter-spacing: 0.05em;
}
.nav-label {
    font-weight: 500;
}

.sidebar-foot {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    color: var(--c-graphite);
    padding-top: 16px;
    border-top: 1px solid rgba(232, 224, 216, 0.1);
}
.foot-line { color: var(--c-vellum); opacity: 0.6; }

/* Mobile bottom nav (hidden by default) */
.bottom-nav { display: none; }

/* =========================================================
   Main content
   ========================================================= */
.main {
    margin-left: var(--sidebar-w);
    position: relative;
    z-index: 1;
    transition: margin-left 0.45s var(--ease-soft);
}
.section {
    position: relative;
    padding: 120px clamp(32px, 5vw, 96px);
    min-height: 100vh;
}

.section-eyebrow {
    font-family: var(--f-mono);
    font-size: clamp(0.7rem, 0.85vw, 0.8rem);
    text-transform: uppercase;
    letter-spacing: 0.22em;
    color: var(--c-graphite);
    display: inline-flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 28px;
}
.swatch {
    display: inline-block;
    width: 20px;
    height: 4px;
}
.swatch-amethyst { background: var(--c-amethyst); }
.swatch-emerald { background: var(--c-emerald); }
.swatch-ruby { background: var(--c-ruby); }
.swatch-topaz { background: var(--c-topaz); }

.section-head {
    max-width: 820px;
    margin-bottom: 72px;
    position: relative;
    z-index: 2;
}
.section-title {
    font-family: var(--f-display);
    font-weight: 500;
    font-size: clamp(1.75rem, 4vw, 3.5rem);
    line-height: 1.08;
    letter-spacing: -0.02em;
    color: var(--c-sapphire);
    margin-bottom: 20px;
}
.section-deck {
    font-family: var(--f-prose);
    font-size: clamp(1.05rem, 1.25vw, 1.25rem);
    color: var(--c-graphite);
    max-width: 60ch;
    font-style: italic;
}

/* =========================================================
   01 Thesis
   ========================================================= */
.section-thesis {
    min-height: 100vh;
    display: grid;
    place-items: center;
    text-align: center;
    overflow: hidden;
    padding: 120px clamp(32px, 5vw, 96px) 160px;
}
.thesis-inner {
    position: relative;
    z-index: 2;
    max-width: 1100px;
}
.section-thesis .section-eyebrow {
    justify-content: center;
}
.thesis-title {
    font-family: var(--f-display);
    font-weight: 400;
    font-size: clamp(2.5rem, 8vw, 7rem);
    line-height: 0.98;
    letter-spacing: -0.025em;
    color: var(--c-sapphire);
    font-variation-settings: "wght" 100;
    animation: weight-solidify 2.2s var(--ease-soft) 0.2s forwards;
}
.thesis-title .line {
    display: block;
    opacity: 0;
    transform: translateY(24px);
    animation: line-rise 0.9s var(--ease-out-back) forwards;
}
.thesis-title .line-1 { animation-delay: 0.1s; }
.thesis-title .line-2 {
    animation-delay: 0.35s;
    font-style: italic;
    font-family: var(--f-prose);
    font-weight: 500;
    font-size: 0.6em;
    color: var(--c-amethyst);
    margin: 0.15em 0;
}
.thesis-title .line-3 { animation-delay: 0.6s; }

@keyframes weight-solidify {
    from { font-variation-settings: "wght" 100; }
    to { font-variation-settings: "wght" 500; }
}
@keyframes line-rise {
    to { opacity: 1; transform: translateY(0); }
}

.thesis-rule {
    display: block;
    width: 0;
    height: 2px;
    background: var(--c-topaz);
    margin: 36px auto 28px;
    animation: rule-draw 1.1s var(--ease-soft) 1.4s forwards;
}
@keyframes rule-draw {
    from { width: 0; }
    to { width: 220px; }
}

.thesis-manifesto {
    font-family: var(--f-prose);
    font-size: clamp(1.1rem, 1.5vw, 1.45rem);
    color: var(--c-graphite);
    max-width: 640px;
    margin: 0 auto 56px;
    opacity: 0;
    animation: fade-in 1s var(--ease-soft) 1.9s forwards;
}
@keyframes fade-in {
    to { opacity: 1; }
}

.thesis-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 32px;
    font-family: var(--f-mono);
    font-size: 0.75rem;
    color: var(--c-graphite);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    opacity: 0;
    animation: fade-in 1s var(--ease-soft) 2.2s forwards;
}

.thesis-scrollcue {
    position: absolute;
    bottom: 48px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--c-graphite);
    z-index: 3;
    opacity: 0;
    animation: fade-in 1s var(--ease-soft) 2.5s forwards;
}
.cue-line {
    display: block;
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--c-topaz), transparent);
    animation: cue-pulse 2.4s var(--ease-soft) infinite;
}
@keyframes cue-pulse {
    0%, 100% { transform: scaleY(0.5); transform-origin: top; opacity: 0.5; }
    50% { transform: scaleY(1); opacity: 1; }
}

/* =========================================================
   02 Evidence
   ========================================================= */
.section-evidence {
    background: transparent;
}

.evidence-block {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: clamp(32px, 4vw, 72px);
    margin-bottom: 96px;
    align-items: start;
}
.evidence-block.reversed {
    grid-template-columns: 1fr 2fr;
}

.prose-module {
    position: relative;
    padding: 44px 48px 48px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0.2));
    backdrop-filter: blur(2px);
    border: 1px solid rgba(26, 39, 68, 0.08);
    border-left: 3px solid var(--c-sapphire);
}
.evidence-block.reversed .prose-module {
    border-left: 1px solid rgba(26, 39, 68, 0.08);
    border-right: 3px solid var(--c-sapphire);
}

.column-capital {
    width: 40px;
    height: 40px;
    margin-bottom: 24px;
    opacity: 0.55;
}
.prose-h {
    font-family: var(--f-display);
    font-weight: 600;
    font-size: clamp(1.3rem, 2vw, 1.75rem);
    letter-spacing: -0.01em;
    color: var(--c-sapphire);
    margin-bottom: 20px;
    line-height: 1.2;
}
.prose-module p {
    font-family: var(--f-prose);
    font-size: clamp(1rem, 1.15vw, 1.2rem);
    line-height: 1.75;
    color: var(--c-obsidian);
    max-width: 60ch;
    margin-bottom: 18px;
}
.prose-module em { color: var(--c-amethyst); font-style: italic; }
.prose-module strong { color: var(--c-sapphire); font-weight: 700; }

.pull-quote {
    position: relative;
    margin: 32px 0 8px;
    padding: 24px 28px 24px 40px;
    background: rgba(26, 39, 68, 0.04);
    border-left: 3px solid var(--c-amethyst);
    font-family: var(--f-prose);
    font-style: italic;
    font-size: clamp(1.1rem, 1.4vw, 1.35rem);
    line-height: 1.5;
    color: var(--c-sapphire);
}
.pq-mark {
    position: absolute;
    top: -10px;
    left: 16px;
    font-family: var(--f-prose);
    font-size: 4rem;
    color: var(--c-amethyst);
    line-height: 1;
    opacity: 0.6;
}
.pull-quote cite {
    display: block;
    margin-top: 12px;
    font-family: var(--f-mono);
    font-style: normal;
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-graphite);
}

/* Data table */
.data-table {
    width: 100%;
    margin-top: 28px;
    border-collapse: collapse;
    font-family: var(--f-prose);
    font-size: 1rem;
}
.data-table th {
    text-align: left;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-graphite);
    padding: 10px 14px;
    border-bottom: 1px solid var(--c-sapphire);
}
.data-table td {
    padding: 12px 14px;
    border-bottom: 1px solid rgba(26, 39, 68, 0.08);
}
.data-table tbody tr:nth-child(odd) { background: rgba(245, 240, 235, 0.6); }
.data-table tbody tr:nth-child(even) { background: rgba(255, 255, 255, 0.6); }
.data-table tbody tr.highlight { border-left: 2px solid var(--c-amethyst); }
.data-table td.num, .data-table th.num {
    font-family: var(--f-mono);
    text-align: right;
    color: var(--c-sapphire);
}

/* Viz module */
.viz-module {
    position: relative;
    padding: 40px 32px;
    background: rgba(26, 39, 68, 0.03);
    border: 1px solid rgba(26, 39, 68, 0.1);
}
.viz-caption {
    margin-top: 20px;
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--c-graphite);
    text-align: center;
    padding-top: 16px;
    border-top: 1px solid rgba(26, 39, 68, 0.1);
}

/* Radial chart */
.radial-chart {
    position: relative;
    width: min(260px, 100%);
    aspect-ratio: 1 / 1;
    margin: 0 auto;
}
.radial-ring {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(
        var(--c-amethyst) 0% 30%,
        var(--c-emerald) 30% 52%,
        var(--c-ruby) 52% 80%,
        var(--c-topaz) 80% 100%
    );
    box-shadow: inset 0 0 30px rgba(15, 26, 46, 0.3);
    transform: rotate(-90deg) scale(0);
    transition: transform 1.4s var(--ease-overshoot);
}
.radial-chart.is-revealed .radial-ring {
    transform: rotate(-90deg) scale(1);
}
.radial-ring::after {
    content: "";
    position: absolute;
    inset: 18%;
    background: var(--c-marble);
    border-radius: 50%;
    box-shadow: 0 4px 16px rgba(15, 26, 46, 0.15);
}
.radial-core {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: var(--f-display);
    z-index: 2;
}
.radial-value {
    font-size: 2.4rem;
    font-weight: 600;
    color: var(--c-sapphire);
    line-height: 1;
}
.radial-unit {
    font-family: var(--f-mono);
    font-size: 0.8rem;
    color: var(--c-amethyst);
    margin-top: 2px;
}
.radial-label {
    font-family: var(--f-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--c-graphite);
    margin-top: 6px;
}
.radial-legend {
    list-style: none;
    margin-top: 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 16px;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    color: var(--c-graphite);
}
.radial-legend li { display: flex; align-items: center; gap: 8px; }
.dot { width: 10px; height: 10px; display: inline-block; border-radius: 2px; }
.dot-amethyst { background: var(--c-amethyst); }
.dot-emerald { background: var(--c-emerald); }
.dot-ruby { background: var(--c-ruby); }
.dot-topaz { background: var(--c-topaz); }

/* Node-link */
.node-link {
    width: 100%;
    height: auto;
    max-height: 320px;
}
.node-link .nl-link {
    stroke-dasharray: 400;
    stroke-dashoffset: 400;
    transition: stroke-dashoffset 1.6s var(--ease-soft);
}
.node-link.is-revealed .nl-link {
    stroke-dashoffset: 0;
}
.node-link .nl-node circle {
    transform-origin: center;
    transform-box: fill-box;
    animation: node-pulse 3s ease-in-out infinite;
}
.node-link .nl-node:nth-child(8) circle { animation-delay: 0.5s; }
.node-link .nl-node:nth-child(9) circle { animation-delay: 1s; }
.node-link .nl-node:nth-child(10) circle { animation-delay: 1.5s; }
.node-link .nl-node:nth-child(11) circle { animation-delay: 2s; }
.node-link .nl-node text {
    font-family: "IBM Plex Mono", monospace;
    font-size: 10px;
    fill: var(--c-graphite);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
@keyframes node-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.12); }
}

/* Area chart */
.area-chart {
    width: 100%;
    height: auto;
    max-height: 240px;
}
.area-chart .area {
    opacity: 0.6;
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 1.2s var(--ease-overshoot);
}
.area-chart.is-revealed .a-1 { transition-delay: 0s; transform: scaleY(1); }
.area-chart.is-revealed .a-2 { transition-delay: 0.15s; transform: scaleY(1); }
.area-chart.is-revealed .a-3 { transition-delay: 0.3s; transform: scaleY(1); }
.area-chart .area-labels text {
    font-family: "IBM Plex Mono", monospace;
    font-size: 8px;
    fill: var(--c-graphite);
    letter-spacing: 0.1em;
}

/* Section divider */
.section-divider {
    height: 10px;
    margin: 0 0 96px;
    background:
        linear-gradient(to bottom, var(--c-topaz), var(--c-topaz)) top / 100% 1px no-repeat,
        linear-gradient(to bottom, var(--c-topaz), var(--c-topaz)) bottom / 100% 1px no-repeat,
        repeating-linear-gradient(
            90deg,
            transparent 0 6px,
            rgba(90, 90, 110, 0.18) 6px 7px,
            transparent 7px 14px
        );
    opacity: 0.6;
}

/* =========================================================
   03 Colloquium — cards
   ========================================================= */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(24px, 2.5vw, 40px);
    perspective: 1200px;
}
.card {
    perspective: 1200px;
    height: 380px;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s var(--ease-soft), transform 0.7s var(--ease-out-back);
}
.card.is-revealed { opacity: 1; transform: translateY(0); }
.card:nth-child(1) { transition-delay: 0s; }
.card:nth-child(2) { transition-delay: 0.1s; }
.card:nth-child(3) { transition-delay: 0.2s; }
.card:nth-child(4) { transition-delay: 0.3s; }
.card:nth-child(5) { transition-delay: 0.4s; }
.card:nth-child(6) { transition-delay: 0.5s; }

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.6s var(--ease-out-back);
    cursor: pointer;
}
.card.is-flipped .card-inner,
.card:hover .card-inner,
.card:focus-visible .card-inner {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    padding: 32px 28px;
}

/* Front */
.card-front {
    background: var(--c-sapphire);
    color: var(--c-marble);
    align-items: flex-start;
    justify-content: space-between;
    overflow: hidden;
}
.card-front::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(123, 45, 142, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(27, 107, 74, 0.08) 0%, transparent 50%);
    pointer-events: none;
}
.card-front > * { position: relative; z-index: 1; }
.card-icon {
    width: 72px;
    height: 72px;
    margin-bottom: 24px;
    opacity: 0.95;
}
.card-num {
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    color: var(--c-topaz);
    margin-bottom: 8px;
}
.card-title {
    font-family: var(--f-display);
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.01em;
    line-height: 1.15;
    color: var(--c-marble);
    flex: 1;
}
.card-foot {
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--c-topaz);
    align-self: flex-end;
    margin-top: auto;
    opacity: 0.7;
}

/* Back */
.card-back {
    transform: rotateY(180deg);
    background: var(--c-marble);
    color: var(--c-obsidian);
    background-image:
        radial-gradient(ellipse at 20% 20%, rgba(232, 224, 216, 0.9) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 70%, rgba(212, 207, 200, 0.7) 0%, transparent 50%),
        linear-gradient(165deg, transparent 65%, rgba(90, 90, 110, 0.06) 66%, transparent 68%);
    border-top: 4px solid var(--c-amethyst);
    justify-content: center;
}
.card[data-accent="amethyst"] .card-back { border-top-color: var(--c-amethyst); }
.card[data-accent="emerald"] .card-back { border-top-color: var(--c-emerald); }
.card[data-accent="ruby"] .card-back { border-top-color: var(--c-ruby); }

.card-back-kicker {
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--c-graphite);
    margin-bottom: 14px;
}
.card-back-body {
    font-family: var(--f-prose);
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--c-obsidian);
    font-style: italic;
}

/* =========================================================
   04 Marginalia
   ========================================================= */
.marginalia-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(32px, 4vw, 72px);
    align-items: start;
}
.marginalia-quotes {
    display: flex;
    flex-direction: column;
    gap: 28px;
    max-height: 720px;
    overflow-y: auto;
    padding-right: 16px;
    scrollbar-width: thin;
    scrollbar-color: var(--c-amethyst) transparent;
}
.marginalia-quotes::-webkit-scrollbar { width: 6px; }
.marginalia-quotes::-webkit-scrollbar-thumb { background: var(--c-amethyst); }

.quote-card {
    padding: 28px 32px;
    background: rgba(255, 255, 255, 0.55);
    border: 1px solid rgba(26, 39, 68, 0.08);
    border-left: 3px solid var(--c-topaz);
    transition: transform 0.3s var(--ease-soft), border-left-color 0.3s;
}
.quote-card:hover {
    transform: translateX(6px);
    border-left-color: var(--c-amethyst);
}
.q-meta {
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-graphite);
    margin-bottom: 12px;
}
.quote-card blockquote {
    font-family: var(--f-prose);
    font-size: clamp(1.05rem, 1.3vw, 1.2rem);
    line-height: 1.6;
    color: var(--c-sapphire);
    font-style: italic;
    margin-bottom: 10px;
}
.quote-card footer {
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    color: var(--c-amethyst);
    text-transform: uppercase;
}

/* Relational map */
.marginalia-diagram {
    position: sticky;
    top: 40px;
    padding: 40px 28px;
    background: rgba(26, 39, 68, 0.03);
    border: 1px solid rgba(26, 39, 68, 0.1);
}
.relational-map { width: 100%; height: auto; }
.relational-map .rm-link {
    stroke-dasharray: 500;
    stroke-dashoffset: 500;
    transition: stroke-dashoffset 1.8s var(--ease-soft);
}
.relational-map.is-revealed .rm-link { stroke-dashoffset: 0; }
.relational-map .rm-node circle {
    transform-origin: center;
    transform-box: fill-box;
    animation: node-pulse 3.5s ease-in-out infinite;
}
.relational-map .rm-node:nth-child(6) circle { animation-delay: 0.4s; }
.relational-map .rm-node:nth-child(7) circle { animation-delay: 0.9s; }
.relational-map .rm-node:nth-child(8) circle { animation-delay: 1.2s; }
.relational-map .rm-node:nth-child(9) circle { animation-delay: 1.6s; }
.relational-map .rm-node:nth-child(10) circle { animation-delay: 2.1s; }
.relational-map .rm-node text {
    font-family: "IBM Plex Mono", monospace;
    font-size: 11px;
    fill: var(--c-graphite);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
.relational-map .rm-center {
    font-family: "Space Grotesk", sans-serif;
    font-size: 10px;
    fill: var(--c-marble);
    font-weight: 700;
    letter-spacing: 0.1em;
}

/* =========================================================
   05 Conclusion
   ========================================================= */
.section-conclusion {
    background: var(--c-ink-deep);
    color: var(--c-marble);
    min-height: 90vh;
    display: grid;
    place-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.section-conclusion::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 30%, rgba(123, 45, 142, 0.15) 0%, transparent 55%),
        radial-gradient(ellipse at 70% 70%, rgba(27, 107, 74, 0.1) 0%, transparent 55%),
        radial-gradient(ellipse at 50% 50%, rgba(212, 168, 67, 0.05) 0%, transparent 70%);
    pointer-events: none;
}
.conclusion-inner {
    position: relative;
    z-index: 1;
    max-width: 920px;
    padding: 40px;
}
.brand-mark-large {
    width: clamp(120px, 14vw, 200px);
    height: auto;
    margin: 0 auto 40px;
    opacity: 0.9;
}
.conclusion-eyebrow {
    font-family: var(--f-mono);
    font-size: 0.8rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--c-topaz);
    margin-bottom: 28px;
}
.conclusion-title {
    font-family: var(--f-prose);
    font-weight: 500;
    font-size: clamp(1.5rem, 3.5vw, 2.8rem);
    line-height: 1.35;
    color: var(--c-marble);
    letter-spacing: -0.005em;
    max-width: 20ch;
    margin: 0 auto;
}
.conclusion-title em {
    font-style: italic;
    color: var(--c-topaz);
}
.conclusion-rule {
    width: 120px;
    height: 1px;
    background: var(--c-topaz);
    margin: 56px auto;
}
.conclusion-contact {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 48px;
    margin-bottom: 56px;
}
.cc-col {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-family: var(--f-mono);
    font-size: 0.8rem;
    letter-spacing: 0.14em;
}
.cc-label {
    font-size: 0.7rem;
    color: var(--c-graphite);
    text-transform: uppercase;
}
.cc-value {
    color: var(--c-marble);
    text-transform: uppercase;
}
.conclusion-colophon {
    font-family: var(--f-prose);
    font-style: italic;
    font-size: 0.95rem;
    color: var(--c-vellum);
    opacity: 0.55;
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.6;
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1199px) and (min-width: 768px) {
    :root { --sidebar-w: var(--sidebar-w-tablet); }
    .sidebar { width: var(--sidebar-w-tablet); }
    .sidebar:hover { width: 260px; }
    .sidebar .brand-text,
    .sidebar .nav-label,
    .sidebar .nav-num,
    .sidebar-foot { opacity: 0; transition: opacity 0.3s; }
    .sidebar:hover .brand-text,
    .sidebar:hover .nav-label,
    .sidebar:hover .nav-num,
    .sidebar:hover .sidebar-foot { opacity: 1; }
    .sidebar-inner { padding: 28px 20px; }
    .main { margin-left: var(--sidebar-w-tablet); }
    .nav-item a { padding-left: 12px; gap: 10px; }
    .nav-indicator { left: -2px; }
}

@media (max-width: 1024px) {
    .evidence-block,
    .evidence-block.reversed {
        grid-template-columns: 1fr;
    }
    .evidence-block.reversed .viz-module { order: 2; }
    .evidence-block.reversed .prose-module { order: 1; }
    .card-grid { grid-template-columns: repeat(2, 1fr); }
    .marginalia-split { grid-template-columns: 1fr; }
    .marginalia-diagram { position: static; }
}

@media (max-width: 767px) {
    .sidebar { display: none; }
    .main { margin-left: 0; padding-bottom: 88px; }
    .section { padding: 80px clamp(20px, 5vw, 48px); }
    .section-thesis { padding-top: 80px; padding-bottom: 120px; }
    .card-grid { grid-template-columns: 1fr; }
    .card { height: 340px; }

    .bottom-nav {
        display: grid;
        grid-template-columns: repeat(5, 1fr);
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--c-sapphire);
        border-top: 1px solid rgba(212, 168, 67, 0.3);
        z-index: 100;
        padding: 8px 4px;
    }
    .bn-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        padding: 8px 4px;
        font-family: var(--f-mono);
        font-size: 0.6rem;
        letter-spacing: 0.1em;
        text-transform: uppercase;
        color: var(--c-vellum);
        opacity: 0.55;
        transition: opacity 0.3s, color 0.3s;
    }
    .bn-item svg { width: 20px; height: 20px; }
    .bn-item.is-active { opacity: 1; color: var(--c-topaz); }

    .thesis-meta { gap: 16px; font-size: 0.65rem; }
    .evidence-block { gap: 28px; margin-bottom: 64px; }
    .prose-module { padding: 28px 24px; }
    .viz-module { padding: 28px 20px; }
}

/* Tap fallback for cards */
@media (hover: none) {
    .card:hover .card-inner { transform: none; }
    .card.is-flipped .card-inner { transform: rotateY(180deg); }
}