/* ==========================================================================
   Eliuth Chavero Jasso — personal site
   Design system: editorial-tech. Warm ivory, serif editorial voice,
   mono/sans computational layer. MIT paper x architectural monograph.
   ========================================================================== */

:root {
  --bg: #f5f3ee;
  --bg-elevated: #fbfaf6;
  --bg-alt: #efebe2;
  --glass: rgba(255,255,255,0.55);
  --glass-strong: rgba(255,255,255,0.8);
  --ink: #161616;
  --ink-soft: #464646;
  --gray: #7a776c;
  --gray-dim: #a9a599;
  --line: rgba(22,22,22,0.11);
  --line-strong: rgba(22,22,22,0.32);
  --accent-blue: #2f5d73;
  --accent-blue-dim: rgba(47,93,115,0.09);
  --accent-green: #4f8f6a;
  --accent-green-dim: rgba(79,143,106,0.12);
  --accent-red: #b1503f;
  --accent-red-dim: rgba(177,80,63,0.1);
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --serif: 'Source Serif 4', 'Iowan Old Style', Georgia, serif;
  --max: 1200px;
  --max-narrow: 760px;
  --radius: 3px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background-image:
    linear-gradient(rgba(22,22,22,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22,22,22,0.035) 1px, transparent 1px);
  background-size: 56px 56px, 56px 56px;
  background-attachment: fixed;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 32px; }
.wrap-narrow { max-width: var(--max-narrow); }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--bg); padding: 12px 16px; z-index: 1000;
}
.skip-link:focus { left: 0; }

a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--sans); font-weight: 700; letter-spacing: -0.01em; margin: 0; }

/* Editorial voice: serif for narrative headlines and statements */
.hero-title, .section-title, .case-title, .contact-title, .pull-quote, .about-lede, .act-statement {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -0.005em;
}
.pull-quote, .act-statement { font-style: italic; }

.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent-blue); margin: 0 0 12px; opacity: 0.9;
}
.mono-line { font-family: var(--mono); font-size: 14px; color: var(--ink-soft); }
.note { font-size: 13px; color: var(--gray-dim); }

/* ---------- Glass surface utility ---------- */
.glass {
  background: var(--glass);
  border: 1px solid var(--line);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
}

/* ---------- Nav ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(245,243,238,0.78);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.mark { font-family: var(--mono); font-weight: 600; font-size: 16px; letter-spacing: 0.02em; color: var(--ink); }
.mark-dot { color: var(--accent-blue); }
.nav-links { display: flex; gap: 22px; margin-left: auto; font-size: 14px; font-weight: 500; }
.nav-links a { color: var(--ink-soft); transition: color 0.15s var(--ease); }
.nav-links a:hover { color: var(--ink); }
.nav-cta { margin-left: 8px; }
.nav-toggle { display: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; font-size: 14px; font-weight: 600;
  border-radius: var(--radius); border: 1px solid var(--line-strong);
  transition: all 0.15s var(--ease); cursor: pointer; background: transparent; color: var(--ink);
}
.btn-primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn-primary:hover { background: var(--accent-blue); border-color: var(--accent-blue); color: #fbfaf6; }
.btn-secondary { background: transparent; color: var(--ink); }
.btn-secondary:hover { background: var(--glass-strong); border-color: var(--ink); }
.btn-ghost { border-color: var(--line); font-weight: 500; padding: 8px 14px; font-size: 13px; color: var(--ink-soft); }
.btn-ghost:hover { border-color: var(--line-strong); color: var(--ink); }

/* ---------- Hero ---------- */
.hero { padding: 140px 0 100px; border-bottom: 1px solid var(--line); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 64px; align-items: center; }
.hero-title { font-size: clamp(26px, 3.6vw, 40px); line-height: 1.18; max-width: 620px; }
.hero-title .sep { color: var(--gray-dim); font-weight: 400; margin: 0 4px; }
.hero-sub { font-size: 18px; color: var(--ink-soft); max-width: 560px; margin: 22px 0 32px; }
.hero-thesis {
  font-family: var(--mono); font-size: 13px; color: var(--ink-soft);
  letter-spacing: 0.01em; max-width: 560px; margin: 0 0 28px; line-height: 1.7;
}
.hero-thesis .arrow { color: var(--accent-blue); margin: 0 2px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }
.hero-links { font-family: var(--mono); font-size: 14px; color: var(--gray); }
.hero-links a { color: var(--ink-soft); }
.hero-links a:hover { color: var(--accent-blue); }
.hero-links .dot { margin: 0 10px; color: var(--line-strong); }
.hero-tags { margin-top: 30px; font-family: var(--mono); font-size: 12.5px; color: var(--gray-dim); letter-spacing: 0.01em; }

/* ---------- Hero animated flow-chain ---------- */
.hero-visual { position: relative; display: flex; gap: 28px; min-height: 460px; }
.flow-chain {
  list-style: none; margin: 0; padding: 0 0 0 26px; position: relative;
  display: flex; flex-direction: column;
  flex: 0 0 auto;
}
.chain-stage-label {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--gray-dim); padding-left: 26px; margin: 16px 0 6px;
}
.chain-stage-label:first-child { margin-top: 0; }
.chain-stage-label span { color: var(--accent-blue); margin-right: 6px; }
.flow-chain::before {
  content: ""; position: absolute; left: 5px; top: 8px; bottom: 8px; width: 1px;
  background: linear-gradient(var(--line-strong), var(--line-strong)) no-repeat;
  background-size: 1px 100%;
}
.chain-node {
  position: relative; padding: 4px 0 4px 26px; cursor: pointer;
  outline: none;
}
.chain-dot {
  position: absolute; left: -26px; top: 50%; transform: translateY(-50%);
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--bg); border: 1px solid var(--line-strong);
  transition: all 0.25s var(--ease);
}
.chain-node.active .chain-dot, .chain-node:hover .chain-dot, .chain-node:focus-visible .chain-dot {
  border-color: var(--accent-blue); background: var(--accent-blue);
  box-shadow: 0 0 0 5px var(--accent-blue-dim);
}
.chain-label {
  font-family: var(--mono); font-size: 13.5px; color: var(--gray);
  transition: color 0.25s var(--ease);
}
.chain-node.active .chain-label, .chain-node:hover .chain-label, .chain-node:focus-visible .chain-label { color: var(--ink); }

.chain-pulse {
  position: absolute; left: 5px; width: 3px; height: 3px; margin-left: -1px;
  border-radius: 50%; background: var(--accent-blue);
  box-shadow: 0 0 8px 2px var(--accent-blue);
  animation: pulseTravel 5.5s linear infinite;
  opacity: 0;
}
.chain-pulse:nth-child(2) { animation-delay: 1.8s; }
.chain-pulse:nth-child(3) { animation-delay: 3.6s; }
@keyframes pulseTravel {
  0% { top: 4%; opacity: 0; }
  6% { opacity: 1; }
  94% { opacity: 1; }
  100% { top: 96%; opacity: 0; }
}

.chain-caption {
  flex: 1; border: 1px solid var(--line); background: var(--glass);
  backdrop-filter: blur(14px); border-radius: var(--radius);
  padding: 26px; display: flex; flex-direction: column; justify-content: center;
  min-height: 200px; align-self: center;
  transition: border-color 0.3s var(--ease);
}
.chain-caption-eyebrow { font-family: var(--mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent-blue); margin: 0 0 10px; }
.chain-caption-text { margin: 0; color: var(--ink-soft); font-size: 14.5px; line-height: 1.65; }
.chain-caption-formula { display: block; margin-top: 14px; font-family: var(--mono); font-size: 14px; color: var(--ink); }

@media (prefers-reduced-motion: reduce) { .chain-pulse { animation: none; opacity: 0; } }

/* ---------- Sections ---------- */
.section { padding: 100px 0; border-bottom: 1px solid var(--line); }
.section-alt { background: var(--bg-alt); }
.section-title { font-size: clamp(22px, 3vw, 30px); max-width: 780px; margin-bottom: 8px; }
.case-title { font-size: 20px; font-weight: 500; color: var(--ink-soft); margin: 0 0 48px; max-width: 700px; }
.section-intro { color: var(--gray); max-width: 620px; margin: 8px 0 40px; }

/* ---------- Generic flow diagrams (kept for architecture/deploy strips) ---------- */
.flow-diagram { display: flex; flex-direction: column; margin: 40px 0; max-width: 720px; }
.flow-step { border: 1px solid var(--line); background: var(--glass); backdrop-filter: blur(10px); padding: 20px 24px; position: relative; }
.flow-step + .flow-step { margin-top: 28px; }
.flow-step + .flow-step::before {
  content: "↓"; position: absolute; top: -28px; left: 24px;
  font-family: var(--mono); color: var(--gray-dim); font-size: 16px; line-height: 28px;
}
.flow-label { display: block; font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--gray); margin-bottom: 6px; }
.flow-step p { margin: 0; }
.flow-compact .flow-step { padding: 14px 20px; }
.flow-compact .flow-step p { font-family: var(--mono); font-size: 13.5px; }
.flow-compact .flow-step + .flow-step { margin-top: 22px; }
.flow-compact .flow-step + .flow-step::before { top: -22px; font-size: 14px; line-height: 22px; }

.diagram-block { margin-top: 56px; }
.diagram-caption { font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--gray); margin: 0 0 4px; }

/* ---------- Architecture canvas ("What I Build") ---------- */
.arch-canvas { margin-top: 48px; }
.arch-reference { margin-top: 80px; }
.arch-layers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.arch-layer { background: var(--bg-alt); padding: 24px 20px; }
.arch-layer-title { font-family: var(--mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--gray); margin: 0 0 16px; }
.arch-layer-stage { color: var(--gray-dim); text-transform: none; letter-spacing: normal; }
.arch-chip {
  display: block; width: 100%; text-align: left; background: transparent; border: 1px solid var(--line);
  color: var(--ink-soft); font-family: var(--sans); font-size: 13.5px; font-weight: 500;
  padding: 10px 12px; margin-bottom: 8px; border-radius: var(--radius); cursor: pointer;
  transition: all 0.18s var(--ease);
}
.arch-chip:hover, .arch-chip:focus-visible { border-color: var(--accent-blue); color: var(--ink); background: var(--accent-blue-dim); }
.arch-chip.active { border-color: var(--accent-blue); color: var(--ink); background: var(--accent-blue-dim); box-shadow: 0 0 0 1px var(--accent-blue) inset; }

.arch-detail {
  margin-top: 1px; border: 1px solid var(--line); border-top: none; background: var(--glass);
  backdrop-filter: blur(14px); padding: 28px 32px; min-height: 120px;
}
.arch-detail-empty { color: var(--gray-dim); font-family: var(--mono); font-size: 13.5px; }
.arch-detail-title { font-size: 17px; margin-bottom: 4px; }
.arch-detail-layer { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent-blue); margin-bottom: 14px; display: block; }
.arch-detail-blurb { color: var(--ink-soft); font-size: 14.5px; max-width: 640px; margin: 0 0 14px; }
.arch-detail-meta { font-family: var(--mono); font-size: 12.5px; color: var(--gray); }

.pull-quote { margin-top: 72px; font-size: 26px; max-width: 640px; }

/* ---------- Case study: 4 acts ---------- */
.acts { margin-top: 48px; display: flex; flex-direction: column; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.act { background: var(--bg-alt); padding: 40px; }
.act-head { display: flex; flex-direction: column; gap: 6px; margin-bottom: 18px; }
.act-num { font-family: var(--mono); font-size: 11.5px; text-transform: uppercase; color: var(--accent-blue); letter-spacing: 0.08em; }
.act-title { font-size: 19px; font-weight: 700; max-width: 640px; line-height: 1.3; }
.act-body { color: var(--ink-soft); font-size: 15px; max-width: 640px; }
.act-statement { font-size: 19px; color: var(--ink); margin: 16px 0 0; max-width: 560px; }

.evidence-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin: 24px 0; max-width: 720px; }
.evidence-stat-num { display: block; font-family: var(--mono); font-size: 28px; font-weight: 600; }
.evidence-stat-label { display: block; font-size: 12px; color: var(--gray); margin-top: 4px; }
.evidence-stat.fail .evidence-stat-num { color: var(--accent-red); }

.predicate-box {
  border: 1px solid var(--line); background: var(--glass); backdrop-filter: blur(10px);
  padding: 18px 22px; margin-top: 20px; max-width: 640px;
}
.predicate-formula { font-family: var(--mono); font-size: 15px; color: var(--ink); }
.predicate-counterexample { font-family: var(--mono); font-size: 13px; color: var(--accent-red); margin-top: 10px; }

.act-diagram-strip { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.act-diagram-strip span {
  font-family: var(--mono); font-size: 12px; color: var(--ink-soft);
  border: 1px solid var(--line); padding: 6px 12px; border-radius: 20px;
}

.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 56px; padding-top: 40px; border-top: 1px solid var(--line); }
.case-evolution { margin-top: 32px; padding-top: 24px; border-top: 1px dashed var(--line); max-width: 640px; }
.case-evolution p:not(.case-label) { color: var(--ink-soft); font-size: 14.5px; margin: 0; }
.case-label { font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray); margin: 0 0 10px; }
.decisions { margin: 0; padding-left: 18px; }
.decisions li { margin-bottom: 6px; color: var(--ink-soft); }

/* ---------- Evidence Graph ---------- */
.evidence-graph-wrap { margin-top: 40px; border: 1px solid var(--line); background: var(--glass); backdrop-filter: blur(14px); }
.evidence-graph-canvas { width: 100%; height: 520px; display: block; cursor: grab; }
.evidence-graph-canvas:active { cursor: grabbing; }
.graph-legend { display: flex; flex-wrap: wrap; gap: 20px; padding: 16px 22px; border-top: 1px solid var(--line); }
.graph-legend-item { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 12px; color: var(--gray); }
.graph-legend-swatch { width: 12px; height: 12px; flex: none; }
.graph-hint { font-size: 12.5px; color: var(--gray-dim); margin: 12px 0 0; }

/* Evidence graph node/link palette (read by evidence-graph.js via getComputedStyle) */
.graph-link { stroke: var(--line-strong); stroke-width: 1; fill: none; }
.graph-link.rel-contradicts { stroke: var(--accent-red); stroke-dasharray: 3 3; }
.graph-link.rel-supports { stroke: var(--accent-green); }
.graph-link.rel-governs { stroke: var(--accent-blue); }
.graph-link.dim { opacity: 0.12; }
.graph-link.lit { opacity: 1; stroke-width: 1.5; }

.graph-node-shape { fill: var(--bg-elevated); stroke: var(--ink-soft); stroke-width: 1.25; transition: opacity 0.2s var(--ease); }
.graph-node.type-requirement .graph-node-shape { stroke: var(--accent-blue); fill: var(--accent-blue-dim); }
.graph-node.type-obligation .graph-node-shape { stroke: var(--accent-blue); }
.graph-node.type-drawing .graph-node-shape, .graph-node.type-schedule .graph-node-shape { stroke: var(--gray); }
.graph-node.type-room .graph-node-shape, .graph-node.type-element .graph-node-shape { stroke: var(--accent-green); }
.graph-node.type-predicate .graph-node-shape { stroke: var(--ink); fill: var(--bg-elevated); }
.graph-node.type-finding .graph-node-shape { stroke: var(--accent-red); }
.graph-node.type-determination .graph-node-shape { stroke: var(--ink); fill: var(--ink); }
.graph-node.dim { opacity: 0.2; }
.graph-node-label { font-family: var(--mono); font-size: 10.5px; fill: var(--ink-soft); pointer-events: none; }
.graph-node.type-determination .graph-node-label { fill: var(--ink); font-weight: 600; }
.graph-node { cursor: pointer; }

/* ---------- About ---------- */
.about-lede { font-size: 20px; margin-bottom: 20px; }
.about-location { font-family: var(--mono); font-size: 13px; color: var(--gray); margin-top: 28px; }

/* ---------- Timeline ---------- */
.timeline { list-style: none; margin: 48px 0 0; padding: 0; max-width: 760px; }
.timeline-item { display: grid; grid-template-columns: 140px 1fr 1fr; gap: 20px; align-items: baseline; padding: 20px 0; border-top: 1px solid var(--line); }
.timeline-item:last-child { border-bottom: 1px solid var(--line); }
.timeline-date { font-family: var(--mono); font-size: 13px; color: var(--gray); }
.timeline-org { font-weight: 700; }
.timeline-role { color: var(--ink-soft); font-size: 14px; }

/* ---------- Capabilities ---------- */
.cap-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); margin-top: 48px; border: 1px solid var(--line); }
.cap-card { background: var(--bg-alt); padding: 28px 24px; }
.cap-card h3 { font-size: 15px; margin-bottom: 16px; }
.cap-card ul { margin: 0; padding: 0; list-style: none; }
.cap-card li { font-size: 13.5px; color: var(--ink-soft); padding: 6px 0; border-top: 1px solid var(--line); }
.cap-card li:first-child { border-top: none; }

/* ---------- Writing / articles ---------- */
.article-list { margin-top: 40px; border-top: 1px solid var(--line); }
.article-row { display: grid; grid-template-columns: 160px 1fr auto; align-items: center; gap: 20px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.article-tag { font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--gray); }
.article-title { font-weight: 600; font-size: 15.5px; color: var(--ink-soft); }
.article-status, .project-status {
  font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--gray-dim); justify-self: end; border: 1px solid var(--line); padding: 3px 9px; border-radius: 20px;
}
.project-status { justify-self: start; }

/* ---------- Research (SEION) ---------- */
.research-list { margin-top: 40px; display: flex; flex-direction: column; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.research-item { background: var(--bg-alt); padding: 26px 28px; display: block; transition: background 0.15s var(--ease); }
.research-item:hover { background: var(--glass-strong); }
.research-item-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 8px; }
.research-item-title { font-size: 16px; font-weight: 700; }
.research-item-tag { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent-green); flex: none; }
.research-item-desc { color: var(--ink-soft); font-size: 14px; max-width: 700px; margin: 0; }
.research-item-link { font-family: var(--mono); font-size: 12.5px; color: var(--gray); margin-top: 10px; display: block; }

/* ---------- Project gallery ---------- */
.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 40px; }
.project-card { background: var(--bg-alt); padding: 28px 24px; display: flex; flex-direction: column; align-items: flex-start; gap: 10px; min-height: 160px; }
.project-name { font-weight: 700; font-size: 15px; }
.project-desc { color: var(--ink-soft); font-size: 13.5px; flex-grow: 1; }

/* ---------- Demo ---------- */
.demo-box, .verify-box { border: 1px solid var(--line); background: var(--glass); backdrop-filter: blur(14px); padding: 32px; margin-top: 40px; }

/* ---------- Verification Playground ---------- */
.verify-top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 20px; margin-bottom: 24px; }
.verify-top .demo-requirement { margin: 0; flex: 1 1 320px; }
.verify-formula {
  font-family: var(--mono); font-size: 17px; color: var(--ink); margin: 0;
  padding: 10px 16px; border: 1px solid var(--line-strong); background: var(--bg-elevated);
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.verify-formula-fail { color: var(--accent-red); border-color: var(--accent-red); background: var(--accent-red-dim); }
.verify-plot-wrap { margin: 20px 0 24px; }
.verify-plot { width: 100%; height: auto; display: block; }
.verify-threshold-line { stroke: var(--line-strong); stroke-width: 1; stroke-dasharray: 4 4; }
.verify-threshold-label { font-family: var(--mono); font-size: 10px; fill: var(--gray); }
.verify-point { fill: var(--ink-soft); }
.verify-point-fail { fill: var(--accent-red); }
.demo-requirement { font-size: 17px; margin: 0 0 24px; }
.demo-req-label { display: block; font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray); margin-bottom: 6px; }
.demo-output { margin-top: 28px; }
.demo-steps { list-style: none; margin: 0; padding: 0; font-family: var(--mono); font-size: 13.5px; }
.demo-steps li { padding: 8px 0; color: var(--gray-dim); opacity: 0; transform: translateY(4px); transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), color 0.3s var(--ease); }
.demo-steps li.show { opacity: 1; transform: translateY(0); color: var(--ink-soft); }
.demo-steps li.done::before { content: "✓ "; color: var(--accent-green); }
.demo-evidence { margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--line); }
.demo-evidence-title { font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray); margin: 0 0 12px; }
.demo-evidence-list { margin: 0 0 20px; padding-left: 18px; font-size: 14px; color: var(--ink-soft); }
.demo-evidence-list li { margin-bottom: 4px; }
.demo-result { display: flex; align-items: center; gap: 12px; border: 1px solid var(--line-strong); padding: 14px 18px; font-family: var(--mono); }
.demo-result span { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray); }
.demo-result strong { font-size: 16px; letter-spacing: 0.04em; }
.demo-result-fail { background: var(--accent-red-dim); border-color: var(--accent-red); }
.demo-result-fail strong { color: var(--accent-red); }

/* ---------- Digital Twin ---------- */
.twin-wrap { margin-top: 40px; }
.twin-modes { display: inline-flex; border: 1px solid var(--line-strong); margin-bottom: 20px; }
.twin-mode {
  font-family: var(--mono); font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--ink-soft); background: transparent; border: none; padding: 10px 18px; cursor: pointer;
  border-right: 1px solid var(--line-strong); transition: all 0.15s var(--ease);
}
.twin-mode:last-child { border-right: none; }
.twin-mode:hover { background: var(--glass-strong); }
.twin-mode.active { background: var(--ink); color: var(--bg); }
.twin-canvas-wrap { border: 1px solid var(--line); background: var(--bg-elevated); }
.twin-canvas { width: 100%; height: 440px; position: relative; }
.twin-activate-hint {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--gray); background: var(--glass-strong); border: 1px solid var(--line);
  padding: 8px 16px; pointer-events: none; white-space: nowrap;
}
.twin-canvas canvas { display: block; width: 100% !important; height: 100% !important; }
.twin-caption { margin: 0; padding: 14px 20px; border-top: 1px solid var(--line); font-size: 13.5px; color: var(--gray); }
@media (max-width: 720px) { .twin-canvas { height: 320px; } }

/* ---------- Computational lab ---------- */
.lab-box { border: 1px solid var(--line); background: var(--glass); backdrop-filter: blur(14px); padding: 32px; margin-top: 56px; }
.lab-title { font-size: 18px; margin: 6px 0 10px; }
.lab-body { color: var(--ink-soft); font-size: 14.5px; max-width: 640px; margin: 0 0 24px; }
.lab-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 32px; align-items: center; }
.lab-plot { width: 100%; height: auto; }
.lab-axis path, .lab-axis line { stroke: var(--line-strong); }
.lab-axis text { fill: var(--gray); font-family: var(--mono); font-size: 10px; }
.lab-axis-label { font-family: var(--mono); font-size: 10px; fill: var(--gray); text-transform: uppercase; letter-spacing: 0.06em; }
.lab-line { fill: none; stroke-width: 2; }
.lab-line-baseline { stroke: var(--line-strong); stroke-dasharray: 3 3; }
.lab-line-active { stroke: var(--accent-blue); }
.lab-marker { fill: var(--accent-red); stroke: var(--bg-elevated); stroke-width: 2; }
.lab-controls { display: flex; flex-direction: column; gap: 20px; }
.lab-control { display: flex; flex-direction: column; gap: 8px; }
.lab-control-label { font-family: var(--mono); font-size: 12.5px; color: var(--ink-soft); }
.lab-control-label span { color: var(--ink); font-weight: 600; }
.lab-control input[type="range"] { width: 100%; accent-color: var(--accent-blue); }
.lab-readout { border-top: 1px solid var(--line); padding-top: 16px; margin-top: 4px; }
.lab-readout-label { display: block; font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray); }
.lab-readout-num { display: block; font-family: var(--mono); font-size: 26px; font-weight: 600; margin-top: 4px; }
@media (max-width: 720px) { .lab-grid { grid-template-columns: 1fr; } }

.project-status-live { border-color: var(--accent-green); color: var(--accent-green); }

/* ---------- Philosophy ---------- */
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 48px; }
.principle-num { font-family: var(--mono); font-size: 13px; color: var(--accent-blue); display: block; margin-bottom: 12px; }
.principle h3 { font-size: 17px; margin-bottom: 10px; line-height: 1.35; }
.principle p { color: var(--ink-soft); font-size: 14.5px; margin: 0; }

/* ---------- Metrics ---------- */
.metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; margin-top: 40px; }
.metrics-grid-3 { grid-template-columns: repeat(3, 1fr); max-width: 780px; }
.metric-num { display: block; font-family: var(--mono); font-size: 34px; font-weight: 600; }
.metric-label { display: block; font-size: 13px; color: var(--gray); margin-top: 8px; }

/* ---------- Testimonials ---------- */
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin-top: 40px; }
.testimonial-card { border: 1px solid var(--line); padding: 28px; background: var(--glass); }
.placeholder-card { border-style: dashed; color: var(--gray-dim); background: transparent; }
.testimonial-quote { font-size: 15.5px; line-height: 1.5; margin: 0 0 16px; }
.testimonial-attr { font-family: var(--mono); font-size: 12.5px; color: var(--gray); margin: 0; }

/* ---------- Resume ---------- */
.resume-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 40px; }
.resume-card { border: 1px solid var(--line); background: var(--glass); padding: 28px; display: flex; flex-direction: column; gap: 8px; transition: all 0.15s var(--ease); }
.resume-card:hover { border-color: var(--accent-blue); background: var(--accent-blue-dim); }
.resume-name { font-weight: 700; font-size: 16px; }
.resume-desc { color: var(--ink-soft); font-size: 14px; }
.resume-link { font-family: var(--mono); font-size: 13px; margin-top: 8px; }

/* ---------- Contact ---------- */
.section-contact { text-align: center; padding: 130px 0; }
.contact-title { font-size: clamp(22px, 3.4vw, 32px); max-width: 680px; margin: 0 auto 28px; }
.section-contact .hero-links { justify-content: center; display: flex; margin-bottom: 20px; }

/* ---------- Footer ---------- */
.site-footer { padding: 32px 0; font-family: var(--mono); font-size: 12.5px; color: var(--gray-dim); }
.site-footer .wrap { display: flex; justify-content: space-between; }

/* ---------- Reveal-on-scroll ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { min-height: 320px; }
  .case-grid, .arch-layers, .cap-grid, .project-grid, .principles, .testimonial-grid, .metrics-grid, .evidence-stats { grid-template-columns: repeat(2, 1fr); }
  .timeline-item { grid-template-columns: 100px 1fr; }
  .timeline-role { grid-column: 2; }
}
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; flex-direction: column; justify-content: center; gap: 5px; width: 32px; height: 32px; margin-left: auto; background: none; border: none; cursor: pointer; }
  .nav-toggle span { display: block; height: 2px; background: var(--ink); }
  .hero { padding: 100px 0 64px; }
  .case-grid, .arch-layers, .cap-grid, .project-grid, .principles, .testimonial-grid, .metrics-grid, .resume-grid, .evidence-stats { grid-template-columns: 1fr; }
  .act { padding: 28px 24px; }
  .site-footer .wrap { flex-direction: column; gap: 6px; }
}