/* ═══════════════════════════════════════════════════════════════
   YANGRAN.ORG — v4 · Morning Lab
   Modern warmth. Two accent threads. Sediment, not popcorn.
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* Surface — sun-bleached bone, not antique parchment */
  --ground:      #F4F2EE;
  --ground-lift: #ECEAE6;
  --ground-deep: #E4E1DC;

  /* Ink — cool charcoal, not brown-black */
  --ink:         #1A1D21;
  --ink-mid:     #3A3D42;
  --ink-soft:    rgba(26,29,33,0.45);
  --ink-ghost:   rgba(26,29,33,0.18);

  /* Celadon — the humanities accent (soul, philosophy, Dao) */
  --celadon:     #5E8A78;
  --celadon-dim: rgba(94,138,120,0.15);
  --celadon-mid: rgba(94,138,120,0.50);
  --celadon-wash:rgba(94,138,120,0.06);

  /* Slate — the technical accent (science, specs, data) */
  --slate:       #8C9196;
  --slate-dim:   rgba(140,145,150,0.15);
  --slate-mid:   rgba(140,145,150,0.45);

  /* Border — clean, subtle */
  --rule:        rgba(26,29,33,0.08);
  --rule-mid:    rgba(26,29,33,0.14);

  /* Type */
  --ff-body:    'EB Garamond', 'Georgia', serif;
  --ff-display: 'Cormorant Infant', serif;
  --ff-mono:    'IBM Plex Mono', monospace;

  /* Motion */
  --ease:  cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --rise:  cubic-bezier(0.16, 1, 0.3, 1);
  --settle: cubic-bezier(0.22, 0.68, 0.36, 1);
}

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

html { scroll-behavior: smooth; font-size: 17px; -webkit-font-smoothing: antialiased; }

body {
  background: var(--ground);
  color: var(--ink);
  font-family: var(--ff-body);
  font-weight: 400;
  line-height: 1.75;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}

/* Subtle grain — like fine drawing paper */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.018;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  mix-blend-mode: multiply;
}

a { color: inherit; text-decoration: none; }
em { font-style: italic; }
sup { font-size: 0.5em; vertical-align: super; }

/* Shared utility */
.label {
  font-family: var(--ff-mono);
  font-size: 0.65rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.mono-sm {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--celadon-dim); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--celadon-mid); }

::selection { background: var(--celadon-dim); color: var(--ink); }


/* ══════════════════════════════════════════════════════════
   NAV
   ══════════════════════════════════════════════════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  gap: clamp(2rem, 5vw, 5rem);
  padding: 1.6rem 2rem;
  background: rgba(244,242,238,0.88);
  backdrop-filter: blur(24px) saturate(1.4);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  border-bottom: 1px solid var(--rule);
  transition: border-color 0.6s ease, background 0.6s ease;
}

.nav-item {
  font-family: var(--ff-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  transition: color 0.3s var(--ease);
  position: relative;
  padding-bottom: 2px;
}

.nav-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--celadon);
  transition: width 0.4s var(--settle);
}

.nav-item:hover { color: var(--ink-mid); }
.nav-item:hover::after { width: 100%; }
.nav-item.active { color: var(--ink); }
.nav-item.active::after { width: 100%; background: var(--celadon); }

.nav--scrolled {
  border-bottom-color: var(--rule-mid);
  background: rgba(244,242,238,0.95);
}


/* ══════════════════════════════════════════════════════════
   HERO (index.html)
   ══════════════════════════════════════════════════════════ */
.hero {
  position: relative;
  height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.ripple-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
}

.hero-name {
  font-family: var(--ff-display);
  font-weight: 300;
  font-size: clamp(5rem, 15vw, 12rem);
  line-height: 0.9;
  letter-spacing: -0.035em;
  color: var(--ink);
  animation: riseIn 1.6s var(--rise) both;
}

.hero-line {
  margin-top: 1.25rem;
  font-family: var(--ff-body);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  font-style: italic;
  color: var(--ink-soft);
  letter-spacing: 0.03em;
  animation: riseIn 1.6s var(--rise) 0.25s both;
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: none; }
}

.hero-down {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: riseIn 1.4s var(--rise) 0.5s both;
}

.down-bar {
  width: 1px;
  height: 52px;
  background: linear-gradient(to bottom, var(--celadon-mid), transparent);
  animation: barBreathe 2.6s ease-in-out infinite;
}

@keyframes barBreathe {
  0%, 100% { transform: scaleY(1); opacity: 0.6; }
  50%       { transform: scaleY(0.6); opacity: 1; }
}


/* ══════════════════════════════════════════════════════════
   OPENING
   ══════════════════════════════════════════════════════════ */
.opening {
  padding: clamp(5rem, 12vw, 10rem) clamp(2rem, 8vw, 10rem);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--ground-lift);
}

.opening-text {
  font-family: var(--ff-display);
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  font-weight: 300;
  line-height: 1.65;
  color: var(--ink-mid);
  max-width: 680px;
  letter-spacing: 0.005em;
}

.opening-text em {
  color: var(--ink);
  font-style: italic;
}


/* ══════════════════════════════════════════════════════════
   PROJECT FULL (Tier 1 — index + timeline entries)
   ══════════════════════════════════════════════════════════ */
.project-full {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--rule);
  min-height: 70vh;
}

.project-full--alt {
  background: var(--ground-lift);
}

.pf-left {
  padding: clamp(4rem, 8vw, 7rem) clamp(3rem, 6vw, 6rem);
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  justify-content: flex-end;
}

.pf-right {
  padding: clamp(4rem, 8vw, 7rem) clamp(3rem, 6vw, 6rem);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  justify-content: center;
}

.pf-header { margin-bottom: 0.5rem; }

.pf-title {
  font-family: var(--ff-display);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.pf-tagline {
  font-family: var(--ff-display);
  font-size: clamp(1.1rem, 2.2vw, 1.5rem);
  font-style: italic;
  font-weight: 300;
  color: var(--ink-soft);
  line-height: 1.4;
}

.pf-right p {
  font-size: 1rem;
  color: var(--ink-mid);
  line-height: 1.8;
}

.pf-right em { color: var(--celadon); }

.pf-badges {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.badge {
  font-family: var(--ff-mono);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3em 0.8em;
  border: 1px solid var(--rule-mid);
  color: var(--ink-soft);
  transition: border-color 0.3s, color 0.3s;
}

.badge:hover { border-color: var(--celadon-dim); color: var(--celadon); }


/* ══════════════════════════════════════════════════════════
   IMPACT
   ══════════════════════════════════════════════════════════ */
.impact {
  padding: clamp(4rem, 8vw, 7rem) clamp(2rem, 6vw, 6rem);
  background: var(--ground-deep);
  border-bottom: 1px solid var(--rule);
}

.impact-note {
  display: block;
  margin-bottom: 3.5rem;
}

.impact-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
}

.impact-item {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 0 2rem 0 0;
  border-right: 1px solid var(--rule);
  transition: transform 0.4s var(--ease);
}

.impact-item:hover { transform: translateY(-2px); }
.impact-item:last-child { border-right: none; padding-right: 0; }

.inum {
  font-family: var(--ff-display);
  font-size: clamp(2.5rem, 4vw, 3.8rem);
  font-weight: 300;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.inum sup {
  font-family: var(--ff-body);
  font-size: 0.4em;
  color: var(--celadon);
}

.ilabel {
  font-family: var(--ff-mono);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  line-height: 1.5;
}


/* ══════════════════════════════════════════════════════════
   TIER 2
   ══════════════════════════════════════════════════════════ */
.tier2 {
  padding: clamp(4rem, 8vw, 7rem) clamp(2rem, 6vw, 6rem);
  border-bottom: 1px solid var(--rule);
}

.t2-rule-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.t2-rule {
  flex: 1;
  height: 1px;
  background: var(--rule);
}

.t2-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--rule);
}

.t2-card {
  background: var(--ground);
  padding: 3rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: background 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.t2-card:hover {
  background: var(--ground-lift);
  box-shadow: inset 3px 0 0 var(--celadon-dim);
}

.t2-title {
  font-family: var(--ff-display);
  font-size: 1.9rem;
  font-weight: 300;
  line-height: 1.15;
  color: var(--ink);
}

.t2-body {
  font-size: 0.97rem;
  color: var(--ink-mid);
  line-height: 1.8;
  flex: 1;
}

.t2-link {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--celadon);
  align-self: flex-start;
  border-bottom: 1px solid var(--celadon-dim);
  padding-bottom: 1px;
  transition: opacity 0.25s;
}

.t2-link:hover { opacity: 0.7; }


/* ══════════════════════════════════════════════════════════
   TIER 3
   ══════════════════════════════════════════════════════════ */
.tier3 {
  padding: clamp(4rem, 7vw, 6rem) clamp(2rem, 6vw, 6rem);
  border-bottom: 1px solid var(--rule);
  background: var(--ground-lift);
}

.tier3-label { display: block; margin-bottom: 2.5rem; }

.tier3-list { list-style: none; }

.tier3-list li {
  display: grid;
  grid-template-columns: 56px 220px 1fr;
  gap: 2rem;
  align-items: baseline;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--rule);
  transition: opacity 0.25s, transform 0.35s var(--ease);
}

.tier3-list li:first-child { border-top: 1px solid var(--rule); }
.tier3-list li:hover { opacity: 0.65; transform: translateX(4px); }

.t3y { color: var(--ink-ghost); }
.t3n { font-size: 0.97rem; color: var(--ink-mid); }
.t3d { font-size: 0.86rem; color: var(--ink-soft); line-height: 1.6; }


/* ══════════════════════════════════════════════════════════
   DAO DE JING SECTION (index.html)
   ══════════════════════════════════════════════════════════ */
.dao {
  position: relative;
  min-height: 80vh;
  overflow: hidden;
  background: var(--ground-lift);
  border-top: 1px solid var(--rule);
  display: flex;
  align-items: center;
}

.dao-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.dao-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: clamp(5rem, 10vw, 9rem) clamp(2rem, 6vw, 6rem);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 4rem 3rem;
  align-items: start;
}

.dao-verse {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
}

.dao-verse--mid   { margin-top: clamp(3rem, 6vw, 5rem); }
.dao-verse--right { margin-top: clamp(1rem, 3vw, 2rem); }

/* Chinese characters — atmospheric, like a watermark */
.dao-zh {
  font-family: 'Noto Serif SC', serif;
  font-weight: 200;
  font-size: clamp(3.5rem, 6vw, 5.5rem);
  line-height: 1.25;
  color: var(--ink);
  opacity: 0.06;
  letter-spacing: 0.12em;
  user-select: none;
  pointer-events: none;
  transform: scaleY(1.08);
  transform-origin: top left;
  filter: blur(0.3px);
  text-shadow: 0 0 8px rgba(26, 29, 33, 0.03);
  transition: opacity 1.8s ease, filter 1.8s ease;
}

.dao-verse:hover .dao-zh {
  opacity: 0.12;
  filter: blur(0px);
  transition-duration: 0.6s;
}

.dao-en {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.dao-translation {
  font-family: var(--ff-display);
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  font-weight: 300;
  font-style: italic;
  line-height: 1.35;
  color: var(--ink);
  letter-spacing: 0.01em;
}

.dao-source {
  color: var(--ink-ghost);
  display: block;
}


/* ══════════════════════════════════════════════════════════
   CONTACT
   ══════════════════════════════════════════════════════════ */
.contact {
  padding: clamp(4rem, 8vw, 7rem) clamp(2rem, 6vw, 6rem);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: baseline;
  gap: 4rem;
  flex-wrap: wrap;
}

.contact-title {
  font-family: var(--ff-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1;
}

.contact-email {
  font-family: var(--ff-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--ink-mid);
  border-bottom: 1px solid var(--rule-mid);
  padding-bottom: 0.3rem;
  transition: color 0.35s var(--ease), border-color 0.35s var(--ease);
}

.contact-email:hover { color: var(--celadon); border-color: var(--celadon); }

.contact-link {
  font-family: var(--ff-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  transition: color 0.25s;
}

.contact-link:hover { color: var(--celadon); }

.contact-profile {
  color: var(--ink-ghost);
  transition: color 0.25s;
}

.contact-profile:hover { color: var(--celadon-mid); }


/* ══════════════════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════════════════ */
.footer {
  padding: 1.75rem 3rem;
  border-top: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer p, .footer span {
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}


/* ══════════════════════════════════════════════════════════
   REVEAL ANIMATIONS
   ══════════════════════════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1.2s var(--settle), transform 1.2s var(--settle);
  will-change: opacity, transform;
}

.reveal.visible { opacity: 1; transform: none; }

/* data-reveal elements (used on subpages) */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.9s var(--settle), transform 0.9s var(--settle);
}

[data-reveal].visible {
  opacity: 1;
  transform: none;
}


/* ═══════════════════════════════════════════════════════
   TEACHING LANDING + SUBPAGES
   ═══════════════════════════════════════════════════════ */

/* ── HERO (teaching pages) ───────────────────────────── */
.t-hero {
  padding: clamp(8rem, 14vw, 12rem) clamp(2rem, 6vw, 6rem) clamp(4rem, 7vw, 6rem);
  border-bottom: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}

.t-hero::before {
  content: 'λ';
  position: absolute;
  right: -0.05em;
  bottom: -0.15em;
  font-family: var(--ff-display);
  font-size: clamp(12rem, 25vw, 20rem);
  font-style: italic;
  font-weight: 300;
  color: var(--rule);
  pointer-events: none;
  line-height: 1;
  user-select: none;
}

.t-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 3.5rem;
  transition: color 0.25s;
}

.t-back:hover { color: var(--celadon); }

.t-hero-title {
  font-family: var(--ff-display);
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 700px;
  animation: riseIn 1.6s var(--rise) both;
}

.t-hero-title em { color: var(--celadon); }

.t-hero-body {
  margin-top: 2rem;
  font-size: 1rem;
  color: var(--ink-mid);
  max-width: 620px;
  line-height: 1.8;
  animation: riseIn 1.6s var(--rise) 0.25s both;
}
/* ── Course quick-nav (teaching hero) ──────────────── */
.course-nav {
  margin-top: 3rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: riseIn 1.6s var(--rise) 0.4s both; /* <-- Added this */
}

.course-nav-item {
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: var(--ink-ghost);
  transition: color 0.3s var(--ease);
  padding: 0.2em 0;
}

.course-nav-item:hover { color: var(--celadon); }

.course-nav-dot {
  color: var(--ink-ghost);
  font-size: 0.5rem;
  opacity: 0.5;
  user-select: none;
}


/* ── PIPELINE SECTION ────────────────────────────────── */
.pipeline-banner {
  padding: clamp(4rem, 7vw, 6rem) clamp(2rem, 6vw, 6rem);
  background: var(--ground-deep);
}

.pipeline-label {
  font-family: var(--ff-mono);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--celadon-mid);
  margin-bottom: 1.5rem;
}

.pipeline-heading {
  font-family: var(--ff-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 300;
  line-height: 1.2;
  max-width: 900px;
  margin-bottom: 1.5rem;
}

.pipeline-heading em { color: var(--celadon); font-style: italic; }

.pipeline-body {
  font-size: 0.97rem;
  color: var(--ink-mid);
  max-width: 660px;
  line-height: 1.85;
  margin-bottom: 3rem;
}

/* ── PIPELINE GRID ─────────────── */
.pipeline-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.pipeline-stage {
  background: var(--ground);
  padding: clamp(1.5rem, 2.5vw, 2.5rem);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  position: relative;
  transition: background 0.35s var(--ease), box-shadow 0.35s var(--ease);
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.pipeline-stage:hover {
  background: var(--ground-lift);
  box-shadow: inset 0 3px 0 var(--celadon-dim);
}

.pipeline-stage::before {
  content: '↗';
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-family: var(--ff-mono);
  font-size: 0.9rem;
  color: var(--celadon);
  opacity: 0;
  transform: translate(-5px, 5px);
  transition: all 0.35s var(--ease);
}

.pipeline-stage:hover::before {
  opacity: 1;
  transform: translate(0, 0);
}

/* Flow arrow between stages */
.pipeline-stage::after {
  content: '→';
  position: absolute;
  right: -0.6rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--ff-mono);
  font-size: 0.9rem;
  color: var(--celadon-mid);
  z-index: 2;
}

.pipeline-stage:last-child::after { display: none; }

.ps-year {
  font-family: var(--ff-mono);
  font-size: 0.5rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--celadon-mid);
}

.ps-code {
  font-family: var(--ff-display);
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  font-weight: 400;
  line-height: 1.15;
}

.ps-name {
  font-family: var(--ff-mono);
  font-size: 0.52rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.ps-desc {
  font-size: 0.85rem;
  color: var(--ink-mid);
  line-height: 1.7;
  margin-top: auto;
}


/* ── PAGE QUOTE (all pages) ──────────────────────────── */
.page-quote {
  padding: clamp(4rem, 7vw, 6rem) clamp(2rem, 6vw, 6rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--ground);
}

.page-quote blockquote {
  max-width: 600px;
  margin: 0 auto;
}

.page-quote .quote-zh {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.2rem;
  color: var(--ink);
  opacity: 0.08;
  font-weight: 300;
  display: block;
  margin-bottom: 1.5rem;
  letter-spacing: 0.2em;
  user-select: none;
}

.page-quote .quote-en {
  font-family: var(--ff-display);
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
  line-height: 1.6;
  color: var(--ink-mid);
  font-style: italic;
  font-weight: 300;
  margin-bottom: 1.5rem;
}

.page-quote cite {
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-style: normal;
}

/* ── EXPERIENCE CALLOUT  ──── */
.exp-callout {
  display: flex;
  gap: 0;
  margin-top: 0;
  position: relative;
  padding-left: 2rem;
}

.exp-callout::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.2rem;
  bottom: 0.2rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--celadon), var(--celadon-dim));
  border-radius: 1px;
}

.exp-text {
  font-size: 0.95rem;
  color: var(--ink-mid);
  line-height: 1.8;
  max-width: 680px;
}

.exp-text strong {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--celadon);
  display: block;
  margin-bottom: 0.75rem;
  font-weight: 400;
}


/* ═══════════════════════════════════════════════════════
   COURSE SUBPAGES (252, 351, eng-physics)
   ═══════════════════════════════════════════════════════ */

/* Reusable section containers */
.teaching-section {
  padding: clamp(4rem, 7vw, 6rem) clamp(2rem, 6vw, 6rem);
}

.section-intro {
  max-width: 800px;
}

.section-label {
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate-mid);
  margin-bottom: 1rem;
}

.section-heading {
  font-family: var(--ff-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 300;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.section-heading em { color: var(--celadon); font-style: italic; }

.section-desc {
  font-size: 0.95rem;
  color: var(--ink-mid);
  line-height: 1.7;
}

/* Section links row */
.sec-links {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}


/* ── TIMELINE PROJECT LAYOUT ─────────────────────────── */
.timeline-container {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  display: flex;
  flex-direction: column;
}

/* Override the global project-full for timeline entries */
.timeline-container .project-full {
  display: grid;
  grid-template-columns: 220px 1fr;
  border-bottom: 1px solid var(--rule);
  min-height: auto;
  transition: background 0.35s var(--ease);
}

.timeline-container .project-full:hover {
  background: var(--ground-lift);
}

.timeline-container .pf-left {
  padding: 2.5rem 2rem;
  border-right: 1px solid var(--rule);
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
}

.timeline-container .pf-year {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  color: var(--slate-mid);
  text-transform: uppercase;
  line-height: 1.6;
}

.timeline-container .pf-right {
  padding: 2.5rem 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.timeline-container .pf-title {
  font-family: var(--ff-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400;
  color: var(--ink);
  line-height: 1.1;
  margin-bottom: 1rem;
}

.pf-quote {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--celadon);
  font-style: italic;
}

.pf-desc {
  font-size: 0.95rem;
  color: var(--ink-mid);
  line-height: 1.75;
  max-width: 700px;
  margin-bottom: 1.5rem;
}

.pf-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

/* Spec / tag pills */
.proj-spec {
  font-family: var(--ff-mono);
  font-size: 0.52rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35em 0.8em;
  border: 1px solid var(--rule-mid);
  color: var(--ink-soft);
  transition: border-color 0.3s, color 0.3s;
  display: inline-block;
}

.proj-spec-hl {
  border-color: var(--celadon-dim);
  color: var(--celadon);
}

/* Advisor credit line */
.pf-advisors {
  margin-top: 1rem;
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}


/* ── LAB GRID ────────────────────────────────────────── */
.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin-top: 2rem;
}

.lab-cell {
  background: var(--ground);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.lab-cell:hover {
  background: var(--ground-lift);
  box-shadow: inset 0 2px 0 var(--celadon-dim);
}

.lab-week {
  font-family: var(--ff-mono);
  font-size: 0.52rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate-mid);
}

.lab-title {
  font-family: var(--ff-display);
  font-size: 1.15rem;
  font-weight: 400;
  line-height: 1.2;
  color: var(--ink);
}

.lab-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: auto;
  padding-top: 1rem;
}

.lab-tag {
  font-family: var(--ff-mono);
  font-size: 0.44rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
  background: var(--ground-deep);
  padding: 0.25em 0.6em;
  border-radius: 1px;
}


/* ── IMPACT STATS GRID ───────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
  border-top: 1px solid var(--rule);
  padding-top: 2rem;
}

.stat-card {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-family: var(--ff-display);
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  line-height: 1;
  color: var(--celadon);
  margin-bottom: 0.5rem;
}

.stat-unit {
  font-family: var(--ff-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mid);
  display: inline-block;
  transform: translateY(-0.25rem);
}

.stat-desc {
  font-size: 0.88rem;
  color: var(--ink-mid);
  line-height: 1.5;
  max-width: 200px;
}



/* ══════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════ */

/* Tier 1 projects */
@media (max-width: 900px) {
  .project-full:not(.timeline-container .project-full) {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .project-full:not(.timeline-container .project-full) .pf-left {
    border-right: none;
    border-bottom: 1px solid var(--rule);
    padding: clamp(3rem, 6vw, 5rem) clamp(2rem, 4vw, 4rem) 2rem;
  }
  .project-full:not(.timeline-container .project-full) .pf-right {
    padding: 2rem clamp(2rem, 4vw, 4rem) clamp(3rem, 6vw, 5rem);
  }
}

/* Timeline entries */
@media (max-width: 820px) {
  .timeline-container .project-full { grid-template-columns: 1fr; }
  .timeline-container .pf-left {
    padding: 2rem 2rem 0.5rem 2rem;
    border-right: none;
  }
  .timeline-container .pf-right { padding: 0.5rem 2rem 2rem 2rem; }
}

/* Impact row */
@media (max-width: 900px) {
  .impact-row {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
  .impact-item { border-right: none; padding: 0; }
}

@media (max-width: 550px) {
  .impact-row { grid-template-columns: repeat(2, 1fr); }
}

/* Tier 2 */
@media (max-width: 700px) {
  .t2-grid { grid-template-columns: 1fr; }
}

/* Tier 3 */
@media (max-width: 700px) {
  .tier3-list li {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
}

/* Pipeline grid */
@media (max-width: 1100px) {
  .pipeline-track { grid-template-columns: 1fr 1fr; }
  .pipeline-stage:nth-child(2)::after { display: none; }
}

@media (max-width: 768px) {
  .pipeline-track { grid-template-columns: 1fr; }
  .pipeline-stage::after { display: none; }
  .pipeline-stage { padding: 1.5rem; }
}

/* Dao section */
@media (max-width: 900px) {
  .dao-inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .dao-verse--mid,
  .dao-verse--right { margin-top: 0; }
}

/* Nav */
@media (max-width: 500px) {
  .nav { gap: 1.5rem; padding: 1.2rem 1rem; }
  .nav-item { font-size: 0.6rem; letter-spacing: 0.1em; }
}