/* ==========================================================================
   Limeng Ge — personal site
   Theme: "∴ therefore" — three dots that open into a syllogism Venn diagram.
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  color-scheme: light;
  --font-display: "Newsreader", Georgia, "Times New Roman", serif;
  --font-body: "Source Sans 3", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-cjk: "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --bg: #fdfcfa;
  --bg-nav: rgba(253, 252, 250, 0.88);
  --surface: #f6f3ee;
  --surface-2: #eee9e1;
  --text: #1c1a18;
  --text-2: #55504a;
  --text-3: #8a847c;
  --border: #e7e2da;
  --accent: #800000;
  --accent-strong: #5c0000;
  --accent-soft: rgba(128, 0, 0, 0.07);
  --on-accent: #fff;
  --venn-s: #c47f17;
  --venn-m: #800000;
  --venn-p: #3a6ea5;
  --good: #2e7d4f;
  --bad: #b3261e;
  --shadow: 0 1px 2px rgba(28, 26, 24, 0.05), 0 10px 28px rgba(28, 26, 24, 0.07);

  --lamp-hint: "pull for darkness";
  --logo-tile: transparent;

  --nav-h: 58px;
  --max: 920px;
  --gutter: 1.5rem;

  /* Cursors: a maroon arrow site-wide, "∴" in the Syllogism Lab */
  --cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Cpath d='M4 2.5v17.2l4.6-4.3 3.1 6.6 3-1.4-3.1-6.5h6.3z' fill='%23800000' stroke='%23ffffff' stroke-width='1.5' stroke-linejoin='round'/%3E%3C/svg%3E") 4 3, auto;
  --cursor-therefore: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='28' viewBox='0 0 28 28'%3E%3Cg fill='%23800000' stroke='%23ffffff' stroke-width='1.6'%3E%3Ccircle cx='14' cy='5' r='3.7'/%3E%3Ccircle cx='6' cy='19' r='3.7'/%3E%3Ccircle cx='22' cy='19' r='3.7'/%3E%3C/g%3E%3C/svg%3E") 14 5, auto;
  --cursor-therefore-hot: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='28' viewBox='0 0 28 28'%3E%3Cg stroke='%23ffffff' stroke-width='1.6'%3E%3Ccircle cx='14' cy='5' r='3.7' fill='%23800000'/%3E%3Ccircle cx='6' cy='19' r='3.7' fill='%23c47f17'/%3E%3Ccircle cx='22' cy='19' r='3.7' fill='%233a6ea5'/%3E%3C/g%3E%3C/svg%3E") 14 5, pointer;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #171513;
    --bg-nav: rgba(23, 21, 19, 0.86);
    --surface: #1f1c19;
    --surface-2: #29251f;
    --text: #ece7df;
    --text-2: #bdb6ab;
    --text-3: #8b847a;
    --border: #312c26;
    --accent: #e0897f;
    --accent-strong: #f2aaa1;
    --accent-soft: rgba(224, 137, 127, 0.1);
    --on-accent: #1a1210;
    --venn-s: #c07f22;
    --venn-m: #d0645c;
    --venn-p: #5b8fd0;
    --good: #6cc08b;
    --lamp-hint: "pull for lights";
    --logo-tile: #f1ece4;
    --bad: #ef8a80;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 30px rgba(0, 0, 0, 0.35);
    --cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Cpath d='M4 2.5v17.2l4.6-4.3 3.1 6.6 3-1.4-3.1-6.5h6.3z' fill='%23e0897f' stroke='%23171513' stroke-width='1.5' stroke-linejoin='round'/%3E%3C/svg%3E") 4 3, auto;
    --cursor-therefore: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='28' viewBox='0 0 28 28'%3E%3Cg fill='%23e0897f' stroke='%23171513' stroke-width='1.6'%3E%3Ccircle cx='14' cy='5' r='3.7'/%3E%3Ccircle cx='6' cy='19' r='3.7'/%3E%3Ccircle cx='22' cy='19' r='3.7'/%3E%3C/g%3E%3C/svg%3E") 14 5, auto;
    --cursor-therefore-hot: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='28' viewBox='0 0 28 28'%3E%3Cg stroke='%23171513' stroke-width='1.6'%3E%3Ccircle cx='14' cy='5' r='3.7' fill='%23e0897f'/%3E%3Ccircle cx='6' cy='19' r='3.7' fill='%23c07f22'/%3E%3Ccircle cx='22' cy='19' r='3.7' fill='%235b8fd0'/%3E%3C/g%3E%3C/svg%3E") 14 5, pointer;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #171513;
  --bg-nav: rgba(23, 21, 19, 0.86);
  --surface: #1f1c19;
  --surface-2: #29251f;
  --text: #ece7df;
  --text-2: #bdb6ab;
  --text-3: #8b847a;
  --border: #312c26;
  --accent: #e0897f;
  --accent-strong: #f2aaa1;
  --accent-soft: rgba(224, 137, 127, 0.1);
  --on-accent: #1a1210;
  --venn-s: #c07f22;
  --venn-m: #d0645c;
  --venn-p: #5b8fd0;
  --good: #6cc08b;
  --lamp-hint: "pull for lights";
  --logo-tile: #f1ece4;
  --bad: #ef8a80;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 30px rgba(0, 0, 0, 0.35);
  --cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Cpath d='M4 2.5v17.2l4.6-4.3 3.1 6.6 3-1.4-3.1-6.5h6.3z' fill='%23e0897f' stroke='%23171513' stroke-width='1.5' stroke-linejoin='round'/%3E%3C/svg%3E") 4 3, auto;
  --cursor-therefore: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='28' viewBox='0 0 28 28'%3E%3Cg fill='%23e0897f' stroke='%23171513' stroke-width='1.6'%3E%3Ccircle cx='14' cy='5' r='3.7'/%3E%3Ccircle cx='6' cy='19' r='3.7'/%3E%3Ccircle cx='22' cy='19' r='3.7'/%3E%3C/g%3E%3C/svg%3E") 14 5, auto;
  --cursor-therefore-hot: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='28' viewBox='0 0 28 28'%3E%3Cg stroke='%23171513' stroke-width='1.6'%3E%3Ccircle cx='14' cy='5' r='3.7' fill='%23e0897f'/%3E%3Ccircle cx='6' cy='19' r='3.7' fill='%23c07f22'/%3E%3Ccircle cx='22' cy='19' r='3.7' fill='%235b8fd0'/%3E%3C/g%3E%3C/svg%3E") 14 5, pointer;
}

/* ---------- 2. Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  cursor: var(--cursor);
  transition: background-color 0.3s, color 0.3s;
}

::selection { background: var(--accent-soft); color: inherit; }
::selection { background: color-mix(in srgb, var(--accent) 22%, transparent); }

img, svg { display: block; max-width: 100%; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--accent-strong); }

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.2;
  color: var(--text);
}

strong, b { font-weight: 600; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.container { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

.section { padding: 2rem 0; }
.section + .section { border-top: 1px solid var(--border); }

.section-title {
  font-size: 1.45rem;
  margin-bottom: 1.25rem;
  padding-left: 0.7rem;
  border-left: 3px solid var(--accent);
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}
.section-title small {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--text-3);
  font-weight: 400;
}

.muted { color: var(--text-3); }

/* ---------- 3. Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  background: var(--bg-nav);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  max-width: var(--max);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
}
.brand:hover { color: var(--text); }
.brand .logo { width: 30px; height: 30px; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  list-style: none;
}

.nav__links a {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.65rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-2);
  border-radius: 999px;
  position: relative;
}
.nav__links a:hover { color: var(--text); }
.nav__links a.active { color: var(--accent); }
.nav__links a.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -2px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateX(-50%);
}
.nav__links .fa-arrow-up-right-from-square { font-size: 0.62em; opacity: 0.6; }

/* The Syllogism Lab tab: dashed pill with three "thinking" dots */
.nav__lab a {
  border: 1px dashed color-mix(in srgb, var(--accent) 55%, transparent);
  color: var(--accent);
  margin-left: 0.25rem;
  transition: background 0.2s, border-color 0.2s;
}
.nav__lab a:hover {
  background: var(--accent-soft);
  border-style: solid;
  color: var(--accent);
}
.nav__lab a.active { background: var(--accent); color: var(--on-accent); border-style: solid; border-color: var(--accent); }
.nav__lab a.active::after { display: none; }

.lab-dots {
  position: relative;
  width: 11px;
  height: 10px;
  flex-shrink: 0;
}
.lab-dots i {
  position: absolute;
  width: 3.2px;
  height: 3.2px;
  border-radius: 50%;
  background: currentColor;
  animation: lab-bob 2.4s ease-in-out infinite;
}
.lab-dots i:nth-child(1) { left: 3.9px; top: 0.5px; }
.lab-dots i:nth-child(2) { left: 0.5px; top: 6.3px; animation-delay: 0.15s; }
.lab-dots i:nth-child(3) { left: 7.3px; top: 6.3px; animation-delay: 0.3s; }
@keyframes lab-bob {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-2px); }
}

.nav__toggle {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  position: relative;
}
.nav__toggle span {
  position: absolute;
  left: 9px;
  right: 9px;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.25s, top 0.25s;
}
.nav__toggle span:nth-child(1) { top: 13px; }
.nav__toggle span:nth-child(2) { top: 21px; }
.nav.open .nav__toggle span:nth-child(1) { top: 17px; transform: rotate(45deg); }
.nav.open .nav__toggle span:nth-child(2) { top: 17px; transform: rotate(-45deg); }

/* ---------- 4. Logo: ∴ that opens into a Venn diagram ---------- */
.logo { overflow: visible; }
.logo__c {
  transform-box: fill-box;
  transform-origin: center;
  transform: scale(0.3);
  fill: var(--accent);
  fill-opacity: 1;
  stroke: var(--accent);
  stroke-width: 0;
  transition:
    transform 0.55s cubic-bezier(0.34, 1.45, 0.64, 1),
    fill-opacity 0.4s ease,
    stroke-width 0.3s ease,
    fill 0.4s ease,
    stroke 0.4s ease;
}
.logo__s { transition-delay: 0.05s; }
.logo__p { transition-delay: 0.1s; }
.logo__label {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 5px;
  fill: var(--text-2);
  opacity: 0;
  transition: opacity 0.4s 0.25s;
  text-anchor: middle;
  dominant-baseline: middle;
}

.brand:hover .logo__c,
.logo.is-venn .logo__c { transform: scale(1); fill-opacity: 0.14; stroke-width: 1.3; }
.brand:hover .logo__m, .logo.is-venn .logo__m { fill: var(--venn-m); stroke: var(--venn-m); }
.brand:hover .logo__s, .logo.is-venn .logo__s { fill: var(--venn-s); stroke: var(--venn-s); }
.brand:hover .logo__p, .logo.is-venn .logo__p { fill: var(--venn-p); stroke: var(--venn-p); }
.logo.is-venn .logo__label { opacity: 1; }

/* ---------- 5. Lamp cord (dark-mode toggle) ---------- */
.lamp {
  position: fixed;
  top: var(--nav-h);
  right: max(10px, calc((100vw - var(--max)) / 2 - 34px));
  z-index: 49;
  width: 28px;
  height: 78px;
  display: flex;
  flex-direction: column;
  align-items: center;
  touch-action: none;
  --pull: 0px;
}
.lamp__cord {
  width: 1.5px;
  height: calc(46px + var(--pull));
  background: var(--text-3);
  transition: height 0.45s cubic-bezier(0.34, 1.8, 0.64, 1);
}
.lamp__bead {
  width: 13px;
  height: 17px;
  border-radius: 45% 45% 50% 50%;
  background: var(--accent);
  box-shadow: inset -2px -3px 0 rgba(0, 0, 0, 0.18);
  transition: transform 0.2s;
}
.lamp:hover .lamp__bead { transform: scale(1.12); }
.lamp.dragging .lamp__cord { transition: none; }
.lamp.tug .lamp__cord { animation: tug 0.5s cubic-bezier(0.34, 1.8, 0.64, 1); }
@keyframes tug {
  0% { height: 46px; }
  35% { height: 64px; }
  100% { height: 46px; }
}
.lamp__hint {
  position: absolute;
  top: 70px;
  right: 22px;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.8rem;
  color: var(--text-3);
  white-space: nowrap;
  opacity: 0;
  transform: translateX(6px);
  transition: opacity 0.25s, transform 0.25s;
  pointer-events: none;
}
.lamp__hint::before { content: var(--lamp-hint); }
.lamp:hover .lamp__hint, .lamp:focus-visible .lamp__hint { opacity: 1; transform: none; }

::view-transition-old(root),
::view-transition-new(root) { animation: none; mix-blend-mode: normal; }

/* Touch screens have no hover: the hint would only pop up after a tap and cover the text next to it */
@media (hover: none), (max-width: 760px) {
  .lamp__hint { display: none; }
}

/* ---------- 6. Bio card (home) ---------- */
.bio { padding: 2.75rem 0 2rem; }

.bio__grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  grid-template-areas:
    "side head"
    "side intro"
    "side details";
  column-gap: 2.5rem;
  row-gap: 0.25rem;
  align-items: start;
}
.bio__side { grid-area: side; display: flex; flex-direction: column; align-items: center; gap: 1.1rem; }
.bio__head { grid-area: head; }
.bio__intro { grid-area: intro; }
.bio__details { grid-area: details; }

.bio__name {
  font-size: 2.35rem;
  letter-spacing: -0.01em;
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0 0.5rem;
}
.bio__name .aka {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text-2);
  letter-spacing: 0;
}
.bio__name .cjk {
  font-family: var(--font-cjk);
  font-size: 0.96em;
  font-weight: 500;
}
.bio__title {
  margin-top: 0.45rem;
  font-size: 0.92rem;
  color: var(--text-2);
  line-height: 1.55;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.8rem;
  padding: 0.2rem 0.75rem 0.2rem 0.6rem;
  font-size: 0.8rem;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.status__dot {
  position: relative;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--good);
}
.status__dot::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--good);
  animation: ping 2s cubic-bezier(0, 0, 0.2, 1) infinite;
}
@keyframes ping { 75%, 100% { transform: scale(2.4); opacity: 0; } }

.bio__text {
  margin-top: 1.1rem;
  font-size: 0.98rem;
  color: var(--text);
}
.bio__text p + p { margin-top: 0.7rem; }
.bio__text em { font-family: var(--font-display); font-size: 1.05em; }

.marker {
  background-image: linear-gradient(transparent 62%, color-mix(in srgb, var(--venn-s) 28%, transparent) 62%);
  background-size: 0% 100%;
  background-repeat: no-repeat;
  transition: background-size 0.8s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.marker.is-on, .no-js .marker { background-size: 100% 100%; }

/* Typing line */
.typing {
  margin: 1.25rem 0 1.4rem;
  min-height: 3.2em;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.02rem;
  line-height: 1.55;
  color: var(--text-2);
}
.typing__caret {
  display: inline-block;
  width: 1.5px;
  height: 1.05em;
  margin-left: 2px;
  vertical-align: -0.15em;
  background: var(--accent);
  animation: blink 1s steps(1) infinite;
}
.typing.is-typing .typing__caret { animation: none; }
@keyframes blink { 50% { opacity: 0; } }

/* Meta blocks */
.meta {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr 1fr;
  gap: 1rem 2.25rem;
}
.meta h4 {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.55rem;
}
.meta ul { list-style: none; }
.meta li {
  font-size: 0.88rem;
  color: var(--text-2);
  line-height: 1.3;
  margin-bottom: 0.6rem;
}
.meta li small {
  display: block;
  margin-top: 0.12rem;
  font-size: 0.78rem;
  color: var(--text-3);
}
.traj li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.badge {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 7px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #fff;
  background: var(--c, var(--accent));
  transition: transform 0.25s cubic-bezier(0.34, 1.6, 0.64, 1);
}
.traj-logo {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  padding: 2px;
  border-radius: 7px;
  background: var(--logo-tile);
  display: grid;
  place-items: center;
  transition: transform 0.25s cubic-bezier(0.34, 1.6, 0.64, 1);
}
.traj-logo img { width: 100%; height: 100%; object-fit: contain; }
.traj-logo--app { padding: 0; background: none; }
.traj li:hover .traj-logo { transform: rotate(-6deg) scale(1.08); }

.interest {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.interest::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--k, var(--accent));
  opacity: 0.85;
  flex-shrink: 0;
}

/* Side column: photo, contact, socials */
.flip {
  width: 176px;
  aspect-ratio: 4 / 5;
  perspective: 900px;
  position: relative;
  border-radius: 10px;
}
.flip__inner {
  position: relative;
  width: 100%;
  height: 100%;
}
.flip__face {
  position: absolute;
  inset: 0;
  border-radius: 10px;
  overflow: hidden;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.flip__front { background: var(--surface); }
.flip__photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}
.monogram {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 50% 36%, color-mix(in srgb, var(--venn-m) 16%, transparent) 0 30%, transparent 31%),
    radial-gradient(circle at 36% 60%, color-mix(in srgb, var(--venn-s) 16%, transparent) 0 30%, transparent 31%),
    radial-gradient(circle at 64% 60%, color-mix(in srgb, var(--venn-p) 16%, transparent) 0 30%, transparent 31%),
    var(--surface);
}
.monogram span {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 3.4rem;
  font-weight: 400;
  color: var(--text);
  letter-spacing: -0.02em;
}
.monogram small {
  position: absolute;
  bottom: 0.7rem;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--text-3);
}

.contact { width: 100%; display: grid; gap: 0.2rem; }
.contact__row {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 0.84rem;
  line-height: 1.5;
  min-width: 0;
}
.contact__row > i:first-child {
  width: 0.9rem;
  flex-shrink: 0;
  font-size: 0.78rem;
  text-align: center;
  color: var(--text-3);
}
.contact__row a { font-size: 0.8rem; white-space: nowrap; }
.copy-btn {
  font-size: 0.72rem;
  color: var(--text-3);
  padding: 0 0.15rem;
  border-radius: 4px;
}
.copy-btn:hover { color: var(--accent); }

.socials { display: flex; gap: 0.9rem; justify-content: center; }
.socials a {
  font-size: 1.1rem;
  color: var(--text-3);
  transition: color 0.15s, transform 0.2s cubic-bezier(0.34, 1.6, 0.64, 1);
}
.socials a:hover { color: var(--accent); transform: translateY(-3px); }

/* Tooltip */
.tip {
  position: relative;
  border-bottom: 1px dashed var(--text-3);
  cursor: help;
}
.tip::after {
  content: attr(data-tip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translate(-50%, 4px);
  padding: 0.3rem 0.6rem;
  font-size: 0.74rem;
  line-height: 1.35;
  white-space: nowrap;
  color: var(--bg);
  background: var(--text);
  border-radius: 6px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s, transform 0.15s;
  z-index: 10;
}
.tip:hover::after, .tip:focus::after { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 7. News ---------- */
.news { list-style: none; }
.news__item {
  display: grid;
  grid-template-columns: 3rem 4.6rem 1fr;
  gap: 0.75rem;
  padding: 0.62rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  line-height: 1.5;
}
.news__item:last-child { border-bottom: 0; }
.news__date { font-size: 0.8rem; color: var(--text-3); padding-top: 0.1rem; font-variant-numeric: tabular-nums; }
.news__tag {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-3);
  padding-top: 0.15rem;
  display: flex;
  align-items: flex-start;
  gap: 0.35rem;
}
.news__tag::before {
  content: "";
  width: 6px;
  height: 6px;
  margin-top: 0.3rem;
  border-radius: 50%;
  background: var(--k, var(--text-3));
  flex-shrink: 0;
}
.news__body a { color: var(--text); font-weight: 600; }
.news__body a:hover { color: var(--accent); }
.news__body i { color: var(--text-2); }
.news__item.is-more { display: none; }
.news.is-open .news__item.is-more { display: grid; animation: rise 0.4s ease both; }

@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.btn-quiet {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: 0.85rem;
  padding: 0.3rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: border-color 0.15s, background 0.15s;
}
.btn-quiet:hover { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.btn-quiet i { font-size: 0.72em; transition: transform 0.25s; }
.btn-quiet[aria-expanded="true"] i { transform: rotate(180deg); }
a.btn-quiet:hover i { transform: translateX(3px); }

/* ---------- 8. Publications ---------- */
.pubs { list-style: none; }
.pub {
  display: flex;
  gap: 1.1rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--border);
}
.pub:last-child { border-bottom: 0; }
.pub__thumb {
  width: 112px;
  flex-shrink: 0;
  aspect-ratio: 4 / 3;
  border-radius: 7px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  overflow: hidden;
}
.pub__thumb svg { width: 78%; height: 78%; }
.pub__thumb .t-line { stroke: var(--text-3); stroke-width: 2; stroke-linecap: round; fill: none; }
.pub__thumb .t-ink { stroke: var(--text-2); stroke-width: 2; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.pub__thumb .t-hl { stroke: var(--venn-s); stroke-width: 5; stroke-linecap: round; opacity: 0.45; }
.pub__thumb .t-s { fill: var(--venn-s); fill-opacity: 0.16; stroke: var(--venn-s); stroke-width: 1.8; }
.pub__thumb .t-m { fill: var(--venn-m); fill-opacity: 0.16; stroke: var(--venn-m); stroke-width: 1.8; }
.pub__thumb .t-p { fill: var(--venn-p); fill-opacity: 0.16; stroke: var(--venn-p); stroke-width: 1.8; }
.pub__thumb .t-accent { stroke: var(--accent); stroke-width: 2.4; fill: none; stroke-linecap: round; }
.pub:hover .pub__thumb svg { animation: wiggle 0.6s ease; }
@keyframes wiggle { 30% { transform: rotate(-3deg) scale(1.04); } 60% { transform: rotate(2deg) scale(1.04); } }

.pub__body { flex: 1; min-width: 0; }
.pub__title { font-size: 0.95rem; font-weight: 600; line-height: 1.4; }
.pub__title a { color: var(--text); }
.pub__title a:hover { color: var(--accent); }
.pub__authors { font-size: 0.85rem; color: var(--text-2); margin-top: 0.15rem; }
.pub__authors .me { color: var(--text); font-weight: 600; text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
.pub__venue { font-size: 0.85rem; font-style: italic; color: var(--text-2); margin-top: 0.05rem; }
.pub__venue .pill {
  font-style: normal;
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0 0.45rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 999px;
  border: 1px solid currentColor;
  color: var(--text-3);
  vertical-align: 1px;
}
.pub__venue .pill--ok { color: var(--good); }
.pub__links { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.45rem; }
.chip-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.05rem 0.55rem;
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  transition: all 0.15s;
}
.chip-link:hover, .chip-link[aria-expanded="true"] { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.chip-link i { font-size: 0.85em; }
.pub__tldr {
  margin-top: 0.6rem;
  padding: 0.55rem 0.8rem;
  font-size: 0.86rem;
  line-height: 1.55;
  color: var(--text-2);
  background: var(--surface);
  border-left: 2px solid var(--venn-s);
  border-radius: 0 6px 6px 0;
  animation: rise 0.3s ease both;
}
.pub__tldr b { color: var(--text); }

/* ---------- 9. Research page ---------- */
.hero {
  padding: 2.5rem 0 1.75rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.hero .logo--hero {
  width: 132px;
  height: 132px;
  margin: 0 auto 0.5rem;
  cursor: pointer;
}
.hero h1 { font-size: 2.3rem; }
.hero p {
  max-width: 34rem;
  margin: 0.5rem auto 0;
  color: var(--text-2);
  font-size: 1rem;
}
.hero__hint { font-size: 0.75rem !important; color: var(--text-3) !important; font-style: italic; }

.threads {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.thread {
  position: relative;
  padding: 1.1rem 1.1rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
  display: flex;
  flex-direction: column;
}
.thread:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--k) 45%, var(--border)); }
.thread__icon {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--k);
  background: color-mix(in srgb, var(--k) 12%, transparent);
  margin-bottom: 0.7rem;
}
.thread h3 { font-size: 1.12rem; margin-bottom: 0.4rem; }
.thread p { font-size: 0.88rem; color: var(--text-2); line-height: 1.55; flex: 1; }
.thread__links { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.8rem; }

.earlier {
  margin-top: 1rem;
  padding: 0.9rem 1.1rem;
  border: 1px dashed var(--border);
  border-radius: 10px;
  font-size: 0.88rem;
  color: var(--text-2);
}
.earlier b { color: var(--text); }

.questions { list-style: none; counter-reset: q; display: grid; gap: 0.6rem; }
.questions li {
  counter-increment: q;
  display: flex;
  gap: 0.8rem;
  align-items: baseline;
  font-size: 0.95rem;
}
.questions li::before {
  content: "Q" counter(q);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--accent);
  flex-shrink: 0;
}

.filters { display: grid; gap: 0.45rem; margin-bottom: 1.2rem; }
.filters__row { display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap; }
.filters__label {
  width: 3.4rem;
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
}
.chip {
  padding: 0.1rem 0.7rem;
  font-size: 0.78rem;
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: all 0.15s;
}
.chip:hover { border-color: var(--text-3); color: var(--text); }
.chip[aria-pressed="true"] { background: var(--text); color: var(--bg); border-color: var(--text); }
.filters__count { font-size: 0.78rem; color: var(--text-3); margin-top: 0.2rem; }

.year-group__label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-top: 0.8rem;
}
.pub.is-hidden, .year-group.is-hidden { display: none; }

/* ---------- 10. Projects page ---------- */
.page-head { padding: 2.5rem 0 1.25rem; }
.page-head h1 { font-size: 2.2rem; }
.page-head p { color: var(--text-2); margin-top: 0.4rem; max-width: 38rem; }

.project {
  padding: 1.4rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  margin-bottom: 1rem;
}
.project--feature { background: linear-gradient(180deg, var(--surface), var(--bg)); }
.project__top { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; flex-wrap: wrap; }
.project h3 { font-size: 1.45rem; }
.project__tag { font-family: var(--font-display); font-style: italic; color: var(--text-2); font-size: 1rem; margin-top: 0.1rem; }
.project__date { font-size: 0.8rem; color: var(--text-3); white-space: nowrap; }
.project p { font-size: 0.92rem; color: var(--text-2); margin-top: 0.7rem; }
.stack { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.85rem; }
.stack span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.1rem 0.5rem;
  border-radius: 5px;
  color: var(--text-2);
  background: var(--surface-2);
}
.project__links { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.9rem; }
.stars { font-variant-numeric: tabular-nums; }

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-top: 1rem;
}
.stat {
  padding: 0.8rem 0.9rem;
  border-radius: 9px;
  background: var(--bg);
  border: 1px solid var(--border);
}
.stat__value { font-size: 1.55rem; font-weight: 600; line-height: 1.1; color: var(--text); font-variant-numeric: tabular-nums; }
.stat__label { font-size: 0.78rem; color: var(--text-2); margin-top: 0.3rem; line-height: 1.4; }

.honest {
  margin-top: 0.9rem;
  font-size: 0.86rem;
  color: var(--text-2);
}
.honest summary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  font-weight: 500;
  color: var(--text);
  list-style: none;
}
.honest summary::-webkit-details-marker { display: none; }
.honest summary::before { content: "+"; font-family: var(--font-mono); color: var(--accent); width: 0.8rem; }
.honest[open] summary::before { content: "−"; }
.honest p { margin-top: 0.4rem; padding-left: 1.2rem; font-size: 0.86rem; }

/* DeepTrace pipeline animation */
.pipeline {
  position: relative;
  display: flex;
  justify-content: space-between;
  margin: 1.2rem 0 0.4rem;
  padding: 0 0.2rem;
  list-style: none;
}
.pipeline::before {
  content: "";
  position: absolute;
  left: 1.2rem;
  right: 1.2rem;
  top: 13px;
  height: 1.5px;
  background: var(--border);
}
.pipeline::after {
  content: "";
  position: absolute;
  top: 9px;
  left: 1.2rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  animation: run 6s cubic-bezier(0.6, 0, 0.4, 1) infinite;
}
@keyframes run {
  0% { left: 1.2rem; opacity: 0; }
  5% { opacity: 1; }
  90% { left: calc(100% - 1.2rem - 10px); opacity: 1; }
  100% { left: calc(100% - 1.2rem - 10px); opacity: 0; }
}
.pipeline li {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  width: 4.5rem;
  text-align: center;
}
.pipeline li span:first-child {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  color: var(--text-2);
  background: var(--bg);
  border: 1.5px solid var(--border);
  transition: all 0.2s;
}
.pipeline li:hover span:first-child { border-color: var(--accent); color: var(--accent); transform: scale(1.1); }
.pipeline li span:last-child { font-size: 0.72rem; color: var(--text-2); font-weight: 500; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.two-col .project { margin-bottom: 0; }

.timeline { list-style: none; position: relative; padding-left: 1.4rem; }
.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1.5px;
  background: var(--border);
}
.timeline li { position: relative; padding: 0 0 1.2rem; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: calc(-1.4rem + 1px);
  top: 0.45rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--k, var(--accent));
  transition: background 0.2s;
}
.timeline li:hover::before { background: var(--k, var(--accent)); }
.timeline__head { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; align-items: baseline; }
.timeline__head b { font-size: 0.98rem; }
.timeline__head span { font-size: 0.8rem; color: var(--text-3); white-space: nowrap; }
.timeline__role { font-size: 0.86rem; color: var(--text-2); font-style: italic; }
.timeline p { font-size: 0.88rem; color: var(--text-2); margin-top: 0.25rem; }

/* ---------- 11. Syllogism Lab ---------- */
.page-lab, .page-lab * { cursor: var(--cursor-therefore); }
.page-lab a, .page-lab button, .page-lab [role="button"], .page-lab summary, .page-lab a *, .page-lab button * { cursor: var(--cursor-therefore-hot); }

.lab-intro { text-align: center; padding: 2.5rem 0 1rem; }
.lab-intro .kicker {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}
.lab-intro h1 { font-size: 2.35rem; margin-top: 0.3rem; }
.lab-intro p { max-width: 36rem; margin: 0.6rem auto 0; color: var(--text-2); }
.lab-intro .rule {
  display: inline-block;
  margin-top: 0.9rem;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.game {
  max-width: 720px;
  margin: 1rem auto 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.game__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1.1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-3);
}
.progress { display: flex; gap: 6px; }
.progress i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1.5px solid var(--text-3);
  transition: all 0.3s;
}
.progress i.is-current { border-color: var(--accent); transform: scale(1.25); }
.progress i.is-right { background: var(--good); border-color: var(--good); }
.progress i.is-wrong { background: var(--bad); border-color: var(--bad); }

.game__stage { padding: 1.5rem 1.5rem 1.4rem; }
.argument { font-family: var(--font-display); font-size: 1.3rem; line-height: 1.55; }
.argument__line { display: flex; gap: 0.8rem; align-items: baseline; animation: rise 0.35s ease both; }
.argument__line:nth-child(2) { animation-delay: 0.08s; }
.argument__line:nth-child(3) { animation-delay: 0.16s; }
.argument__line > span:first-child {
  width: 1.4rem;
  flex-shrink: 0;
  text-align: center;
  font-size: 1rem;
  color: var(--text-3);
}
.argument__line--c {
  margin-top: 0.4rem;
  padding-top: 0.5rem;
  border-top: 1.5px solid var(--text);
}
.argument__line--c > span:first-child { color: var(--accent); font-size: 1.2rem; }
.term { border-bottom: 2px solid var(--k); padding-bottom: 0; }

.game__meta { margin-top: 0.9rem; font-size: 0.78rem; color: var(--text-3); display: flex; gap: 0.9rem; flex-wrap: wrap; }
.game__meta code { font-family: var(--font-mono); font-size: 0.74rem; color: var(--text-2); background: var(--surface-2); padding: 0 0.35rem; border-radius: 4px; }

.answers { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; margin-top: 1.3rem; }
.answer {
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1.5px solid var(--border);
  background: var(--bg);
  font-size: 0.98rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  transition: transform 0.15s, border-color 0.15s, background 0.15s;
}
.answer:hover:not(:disabled) { transform: translateY(-2px); border-color: var(--text-2); }
.answer:active:not(:disabled) { transform: translateY(0) scale(0.98); }
.answer kbd {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  padding: 0 0.35rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--text-3);
}
.answer.is-picked.is-right { border-color: var(--good); background: color-mix(in srgb, var(--good) 10%, var(--bg)); }
.answer.is-picked.is-wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 10%, var(--bg)); animation: shake 0.4s; }
.answer:disabled { cursor: default; opacity: 0.9; }
.answer:disabled:not(.is-picked) { opacity: 0.45; }
@keyframes shake { 20%, 60% { transform: translateX(-4px); } 40%, 80% { transform: translateX(4px); } }

.reveal-panel { display: none; margin-top: 1.3rem; animation: rise 0.4s ease both; }
.reveal-panel.is-shown { display: grid; grid-template-columns: 250px 1fr; gap: 1.3rem; align-items: start; }
.verdict { font-family: var(--font-display); font-size: 1.2rem; margin-bottom: 0.35rem; }
.verdict.is-right { color: var(--good); }
.verdict.is-wrong { color: var(--bad); }
.explain { font-size: 0.9rem; color: var(--text-2); line-height: 1.6; }
.explain em { font-style: italic; }
.model-note {
  margin-top: 0.75rem;
  padding: 0.55rem 0.75rem;
  font-size: 0.82rem;
  color: var(--text-2);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.model-note b { color: var(--text); }
.next-row { display: flex; justify-content: flex-end; margin-top: 1rem; }
.btn-solid {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--on-accent);
  background: var(--accent);
  transition: transform 0.15s, background 0.15s;
}
.btn-solid:hover { background: var(--accent-strong); color: var(--on-accent); transform: translateY(-1px); }

/* Venn diagram */
.venn { width: 100%; height: auto; }
.venn__circle { fill: none; stroke-width: 1.8; }
.venn__label { font-family: var(--font-display); font-style: italic; font-size: 13px; fill: var(--text-2); }
.venn__label b, .venn__label tspan.k { font-style: normal; font-weight: 600; }
.venn__shade { fill: url(#hatch); opacity: 0; transition: opacity 0.5s; }
.venn__shade.is-on { opacity: 1; }
.venn__goal { fill: var(--accent); opacity: 0; }
.venn__goal.is-on { animation: goal 1.6s ease-in-out 2; }
@keyframes goal { 50% { opacity: 0.22; } }
.venn__x { stroke: var(--text); stroke-width: 2.6; stroke-linecap: round; opacity: 0; transition: opacity 0.4s; }
.venn__x.is-on { opacity: 1; }
.venn__x.is-border { stroke: var(--bad); }
.venn__caption { font-size: 0.72rem; color: var(--text-3); text-align: center; margin-top: 0.3rem; line-height: 1.4; }

/* Results */
.results { padding: 1.6rem 1.5rem 1.5rem; }
.results__score { text-align: center; }
.results__score .big { font-family: var(--font-display); font-size: 3.2rem; line-height: 1; }
.results__score p { color: var(--text-2); margin-top: 0.5rem; }
.chart { margin-top: 1.5rem; }
.chart__legend { display: flex; gap: 1.1rem; flex-wrap: wrap; font-size: 0.8rem; color: var(--text-2); margin-bottom: 0.6rem; }
.chart__legend span { display: inline-flex; align-items: center; gap: 0.4rem; }
.chart__legend i { width: 10px; height: 10px; border-radius: 50%; }
.chart svg { width: 100%; height: auto; overflow: visible; }
.chart .grid { stroke: var(--border); stroke-width: 1; }
.chart .axis { font-size: 11px; fill: var(--text-3); font-family: var(--font-body); }
.chart .row-label { font-size: 12.5px; fill: var(--text-2); font-family: var(--font-body); }
.chart .row-label.is-you { fill: var(--text); font-weight: 700; }
.chart .gap-line { stroke: var(--text-3); stroke-width: 2; stroke-linecap: round; opacity: 0.55; }
.chart .dot { stroke: var(--surface); stroke-width: 2; }
.chart .dot--v { fill: var(--dv); }
.chart .dot--i { fill: var(--di); }
.chart .you-band { fill: var(--accent-soft); }
.chart .hit { fill: transparent; }
.chart .gap-label { font-size: 11px; fill: var(--text-3); font-family: var(--font-body); }
.chart-tip {
  position: fixed;
  z-index: 60;
  padding: 0.35rem 0.6rem;
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--bg);
  background: var(--text);
  border-radius: 6px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s;
}
.chart-tip.is-on { opacity: 1; }
.chart-table { margin-top: 0.8rem; font-size: 0.82rem; color: var(--text-2); }
.chart-table summary { cursor: pointer; color: var(--text-3); }
.chart-table table { width: 100%; border-collapse: collapse; margin-top: 0.5rem; font-variant-numeric: tabular-nums; }
.chart-table th, .chart-table td { text-align: right; padding: 0.3rem 0.5rem; border-bottom: 1px solid var(--border); }
.chart-table th:first-child, .chart-table td:first-child { text-align: left; }
.results__actions { display: flex; justify-content: center; gap: 0.6rem; margin-top: 1.4rem; flex-wrap: wrap; }

:root { --dv: #3a6ea5; --di: #c47f17; }
:root[data-theme="dark"] { --dv: #5b8fd0; --di: #c07f22; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --dv: #5b8fd0; --di: #c07f22; } }

.primer { max-width: 720px; margin: 0 auto; }
.primer table { width: 100%; border-collapse: collapse; font-size: 0.88rem; margin-top: 0.4rem; }
.primer th, .primer td { text-align: left; padding: 0.4rem 0.6rem; border-bottom: 1px solid var(--border); }
.primer th { font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3); font-weight: 600; }
.primer td:first-child { font-family: var(--font-display); font-weight: 600; font-size: 1rem; }
.primer p { font-size: 0.9rem; color: var(--text-2); margin-top: 0.8rem; }
.primer .bar {
  display: inline-block;
  height: 8px;
  border-radius: 0 4px 4px 0;
  background: var(--accent);
  opacity: 0.75;
  vertical-align: middle;
  margin-right: 0.5rem;
}
.fineprint { font-size: 0.78rem; color: var(--text-3); margin-top: 1rem; line-height: 1.5; }

/* ---------- 12. Footer, toast, click symbols, reveal ---------- */
.footer {
  margin-top: 2.5rem;
  padding: 1.6rem 0 2.2rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-3);
}
.footer .container { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer a { color: var(--text-2); }
.footer a:hover { color: var(--accent); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  z-index: 80;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  color: var(--bg);
  background: var(--text);
  border-radius: 999px;
  box-shadow: var(--shadow);
  transform: translate(-50%, 20px);
  opacity: 0;
  transition: opacity 0.2s, transform 0.25s cubic-bezier(0.34, 1.5, 0.64, 1);
  pointer-events: none;
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

.sym {
  position: fixed;
  z-index: 70;
  pointer-events: none;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
  line-height: 1;
  user-select: none;
  will-change: transform, opacity;
}

.js .reveal { opacity: 0; transform: translateY(10px); transition: opacity 0.6s ease, transform 0.6s ease; }
.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 14. Internships page ---------- */
.hire {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.2rem;
  flex-wrap: wrap;
  margin-top: 1.3rem;
  padding: 0.85rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}
.hire p { display: flex; align-items: center; gap: 0.6rem; margin: 0; color: var(--text-2); font-size: 0.92rem; }
.hire p b { color: var(--text); }
.hire p .status__dot { flex-shrink: 0; }
.hire__actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.hire .btn-solid { font-size: 0.85rem; padding: 0.4rem 0.95rem; }
.hire .btn-quiet { padding: 0.36rem 0.85rem; }

.tl { margin-top: 1.6rem; overflow-x: auto; padding-bottom: 0.3rem; }
.tl__inner { position: relative; min-width: 620px; height: 132px; }
.tl__axis { position: absolute; left: 0; right: 0; bottom: 24px; height: 1px; background: var(--border); }
.tl__year {
  position: absolute;
  bottom: 0;
  padding-left: 5px;
  font-size: 0.72rem;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
  border-left: 1px solid var(--text-3);
  line-height: 1;
  height: 30px;
  display: flex;
  align-items: flex-end;
}
.tl__item {
  position: absolute;
  left: var(--l);
  width: var(--w);
  top: var(--t);
  display: block;
  color: var(--text);
}
.tl__label {
  position: relative;
  z-index: 1;
  display: block;
  width: max-content;
  padding-right: 5px;
  background: var(--bg);
  margin-bottom: 0.3rem;
  font-size: 0.76rem;
  font-weight: 600;
  white-space: nowrap;
  color: var(--text-2);
  transition: color 0.15s;
}
.tl__bar {
  display: block;
  height: 12px;
  border-radius: 6px;
  background: var(--k);
  transition: transform 0.2s, box-shadow 0.2s;
}
a.tl__item:hover .tl__label { color: var(--text); }
a.tl__item:hover .tl__bar { transform: scaleY(1.35); box-shadow: 0 0 0 4px color-mix(in srgb, var(--k) 20%, transparent); }
.tl__item--edu .tl__bar {
  background: repeating-linear-gradient(135deg, color-mix(in srgb, var(--k) 45%, transparent) 0 6px, color-mix(in srgb, var(--k) 18%, transparent) 6px 12px);
  -webkit-mask-image: linear-gradient(90deg, #000 65%, transparent);
  mask-image: linear-gradient(90deg, #000 65%, transparent);
}
.tl__item--open { display: flex; flex-direction: column; align-items: flex-end; }
.tl__item--open .tl__label { color: var(--good); }
.tl__item--open .tl__bar { align-self: stretch; }
.tl__item--open .tl__bar { background: transparent; border: 1.5px dashed var(--good); animation: breathe 2.4s ease-in-out infinite; }
@keyframes breathe { 50% { background: color-mix(in srgb, var(--good) 18%, transparent); } }
.tl__now { position: absolute; top: 0; bottom: 24px; left: var(--now); border-left: 1.5px dashed var(--accent); }
.tl__now span {
  position: absolute;
  bottom: -20px;
  left: -12px;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.interns { display: grid; gap: 1.2rem; }
.intern {
  position: relative;
  padding: 1.4rem 1.5rem 1.3rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  scroll-margin-top: calc(var(--nav-h) + 16px);
  overflow: hidden;
}
.intern::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--k);
}
.intern:target { box-shadow: 0 0 0 2px color-mix(in srgb, var(--k) 45%, transparent), var(--shadow); }
.intern__head { display: flex; align-items: center; gap: 0.9rem; }
.intern__logo { width: 44px; height: 44px; flex-shrink: 0; border-radius: 10px; transition: transform 0.25s cubic-bezier(0.34, 1.6, 0.64, 1); }
.intern:hover .intern__logo { transform: rotate(-5deg) scale(1.06); }
.intern__who { flex: 1; min-width: 0; }
.intern__who h2 { font-size: 1.45rem; margin: 0; }
.intern__role { font-size: 0.9rem; color: var(--text-2); font-style: italic; }
.intern__when { text-align: right; font-size: 0.85rem; color: var(--text); font-variant-numeric: tabular-nums; line-height: 1.4; }
.intern__when span { display: block; font-size: 0.78rem; color: var(--text-3); }
.intern__lede { margin-top: 0.9rem; font-family: var(--font-display); font-size: 1.12rem; line-height: 1.45; color: var(--text); }

.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 0.7rem; margin-top: 1rem; }
.metric, .shift {
  padding: 0.75rem 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.metric__num { font-size: 1.7rem; font-weight: 600; line-height: 1.05; color: var(--text); font-variant-numeric: tabular-nums; }
.metric__label { font-size: 0.78rem; color: var(--text-2); line-height: 1.35; }
.shift__top { display: flex; justify-content: space-between; align-items: baseline; gap: 0.5rem; font-size: 0.78rem; color: var(--text-2); }
.shift__top b { font-size: 1.05rem; color: var(--text); font-variant-numeric: tabular-nums; white-space: nowrap; }
.shift__track { position: relative; height: 8px; margin: 0.35rem 0 0.15rem; border-radius: 4px; background: var(--surface-2); overflow: hidden; }
.shift__track i { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 0 4px 4px 0; }
.shift__from { width: var(--from); background: var(--text-3); opacity: 0.55; }
.shift__to { width: var(--to); background: var(--k); transition: width 1.2s cubic-bezier(0.2, 0.7, 0.2, 1) 0.2s; }
.js .intern:not(.is-in) .shift__to { width: var(--from); }

.intern__points { margin: 1rem 0 0; padding-left: 1.1rem; display: grid; gap: 0.4rem; }
.intern__points li { font-size: 0.9rem; color: var(--text-2); line-height: 1.55; }
.intern__points li::marker { color: var(--k); }
.intern__points b { color: var(--text); font-weight: 600; }

.toolbox { display: grid; gap: 0.7rem; }
.toolbox__row { display: grid; grid-template-columns: 9rem 1fr; align-items: baseline; gap: 0.8rem; }
.toolbox__row .stack { margin-top: 0; }
.toolbox__label { font-size: 0.72rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3); }
.stack span { transition: background 0.15s, color 0.15s; }
.toolbox .stack span:hover { background: var(--accent-soft); color: var(--accent); }

.meta li a { color: var(--text-2); }
.meta li a:hover { color: var(--accent); }

@media (max-width: 760px) {
  .hire { align-items: flex-start; }
  .intern { padding: 1.1rem 1.1rem 1rem; }
  .intern__head { flex-wrap: wrap; }
  .intern__when { width: 100%; text-align: left; padding-left: calc(44px + 0.9rem); margin-top: -0.3rem; }
  .intern__when span { display: inline; margin-left: 0.4rem; }
  .toolbox__row { grid-template-columns: 1fr; gap: 0.3rem; }
}

/* Logo that flips to reveal a second logo (FacePhys -> Tsinghua) */
.logo-flip { position: relative; padding: 0; border: 0; background: none; perspective: 320px; }
.logo-flip__inner {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.65s cubic-bezier(0.4, 0.2, 0.2, 1);
}
.logo-flip:hover .logo-flip__inner { transform: rotateY(-22deg); }
.logo-flip.is-flipped .logo-flip__inner { transform: rotateY(180deg); }
.logo-flip.is-flipped:hover .logo-flip__inner { transform: rotateY(158deg); }
.logo-flip__face {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border-radius: 22%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
.logo-flip__back {
  display: grid;
  place-items: center;
  padding: 7%;
  background: #fff;
  box-shadow: inset 0 0 0 1px #e4dcea;
  transform: rotateY(180deg);
}
.logo-flip__back img { width: 100%; height: 100%; object-fit: contain; }

/* Publication covers + lightbox */
.pub__thumb {
  width: 150px;
  padding: 0;
  background: #fff;
  cursor: zoom-in;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.pub__thumb img { width: 100%; height: 100%; object-fit: contain; transition: transform 0.35s ease; }
.pub:hover .pub__thumb { border-color: var(--text-3); box-shadow: var(--shadow); }
.pub:hover .pub__thumb img { transform: scale(1.04); }
.lightbox {
  margin: auto;
  padding: 0;
  border: 0;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  max-width: min(92vw, 820px);
  overflow: visible;
}
.lightbox::backdrop { background: rgba(15, 12, 10, 0.62); backdrop-filter: blur(3px); }
.lightbox[open] { animation: rise 0.25s ease both; }
.lightbox figure { margin: 0; }
.lightbox img { display: block; width: 100%; max-height: 78vh; object-fit: contain; border-radius: 12px 12px 0 0; }
.lightbox figcaption { padding: 0.7rem 1rem 0.9rem; font-size: 0.85rem; color: #55504a; border-top: 1px solid #eee; }
.lightbox__close {
  position: absolute;
  top: -14px;
  right: -14px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #1c1a18;
  color: #fff;
  font-size: 1.1rem;
  line-height: 1;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* ---------- 13. Responsive ---------- */
@media (max-width: 860px) {
  .meta { grid-template-columns: 1fr 1fr; }
  .threads { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; }
  .reveal-panel.is-shown { grid-template-columns: 1fr; }
  .reveal-panel .venn-wrap { max-width: 280px; margin: 0 auto; width: 100%; }
}

@media (max-width: 760px) {
  :root { --gutter: 16px; }
  html { font-size: 16px; }
  .nav__toggle { display: block; }
  .nav__links {
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.4rem var(--gutter) 0.8rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    display: none;
  }
  .nav.open .nav__links { display: flex; }
  .nav__links a { padding: 0.7rem 0.3rem; font-size: 0.8rem; border-radius: 6px; }
  .nav__links a.active::after { display: none; }
  .nav__lab a { margin: 0.3rem 0 0; justify-content: center; }
  .lamp { position: absolute; right: calc(var(--gutter) + 8px); width: 20px; height: 56px; }
  .lamp__cord { height: calc(34px + var(--pull)); }
  @keyframes tug { 0% { height: 34px; } 35% { height: 52px; } 100% { height: 34px; } }

  .bio { padding-top: 1.75rem; }
  .bio__grid {
    grid-template-columns: 1fr;
    grid-template-areas: "head" "side" "intro" "details";
    row-gap: 1.1rem;
  }
  .bio__name { font-size: 2rem; }
  .bio__side { flex-direction: row; align-items: flex-start; gap: 1rem; }
  .flip { width: 128px; flex-shrink: 0; }
  .monogram span { font-size: 2.5rem; }
        .side-info { display: grid; gap: 0.8rem; min-width: 0; flex: 1; }
  .socials { justify-content: flex-start; }
  .bio__text { margin-top: 0; }
  .meta { grid-template-columns: 1fr; gap: 0.5rem; }
  .news__item { grid-template-columns: 2.6rem 1fr; }
  .news__tag { display: none; }
  .pub__thumb { width: 92px; }
  .pub { gap: 0.8rem; }
  .stats { grid-template-columns: 1fr; }
  .pipeline li { width: 3.2rem; }
  .pipeline li span:last-child { font-size: 0.64rem; }
  .game__stage { padding: 1.1rem; }
  .argument { font-size: 1.1rem; }
  .answers { grid-template-columns: 1fr; }
  .answer kbd { display: none; }
  .keys-hint { display: none; }
  .hero h1, .lab-intro h1, .page-head h1 { font-size: 1.9rem; }
}

@media (min-width: 761px) {
  .side-info { display: contents; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  .js .reveal { opacity: 1; transform: none; }
}