/* =====================================================================
   Milad Shirani — design system
   Light-first, engineering-grade aesthetic. Dark mode via [data-theme].
   Fonts: Space Grotesk (display) · IBM Plex Mono (labels/numbers)
          · Source Serif 4 (quotes / italic accents)
   ===================================================================== */

/* ---------- 1 · Tokens ---------- */
:root {
  --bg:        #f2f2ed;
  --bg-raised: #fbfbf9;
  --bg-inset:  #e9e9e2;
  --ink:       #17171c;
  --ink-soft:  #4c4c56;
  --ink-faint: #666670;
  --line:      #d8d8cf;
  --line-soft: #e4e4dc;
  --accent:    #2b3cf0;
  --accent-soft: rgba(43, 60, 240, 0.08);
  --accent-line: rgba(43, 60, 240, 0.35);
  --signal:    #d97706;
  --ok:        #0f766e;
  --grid-line: rgba(23, 23, 28, 0.055);
  --shadow:    0 1px 2px rgba(23,23,28,.04), 0 8px 28px rgba(23,23,28,.07);
  --font-d: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-m: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;
  --font-s: "Source Serif 4", Georgia, serif;
  --maxw: 1180px;
  --nav-h: 62px;
  --r: 14px;
}

[data-theme="dark"] {
  --bg:        #0d0e12;
  --bg-raised: #14151b;
  --bg-inset:  #191a21;
  --ink:       #eceded;
  --ink-soft:  #a7a8b3;
  --ink-faint: #8b8c98;
  --line:      #26272f;
  --line-soft: #1e1f26;
  --accent:    #7c8aff;
  --accent-soft: rgba(124, 138, 255, 0.10);
  --accent-line: rgba(124, 138, 255, 0.40);
  --signal:    #f0a343;
  --ok:        #34c3b5;
  --grid-line: rgba(236, 237, 237, 0.045);
  --shadow:    0 1px 2px rgba(0,0,0,.3), 0 10px 32px rgba(0,0,0,.35);
}

/* ---------- 2 · Base ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }
body {
  font-family: var(--font-d);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background .35s ease, color .35s ease;
}
::selection { background: var(--accent); color: #fff; }
img { max-width: 100%; display: block; }
a { color: inherit; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--accent); color: #fff; padding: .6rem 1rem; font-family: var(--font-m);
}
.skip-link:focus { left: 0; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(1.2rem, 4vw, 2.5rem); }

/* mono kicker used everywhere */
.kicker {
  font-family: var(--font-m);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex; align-items: center; gap: .7rem;
}
.kicker::before { content: ""; width: 26px; height: 1px; background: var(--accent); flex: none; }

/* ---------- 3 · Navigation ---------- */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
  transition: background .35s ease, border-color .35s ease;
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; height: 100%;
  padding: 0 clamp(1.2rem, 4vw, 2.5rem);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.nav-logo {
  font-family: var(--font-m); font-weight: 600; font-size: .95rem;
  text-decoration: none; letter-spacing: .04em; color: var(--ink);
  display: flex; align-items: center; gap: .55rem;
}
.nav-logo .dot { width: 9px; height: 9px; border-radius: 2px; background: var(--accent); display: inline-block; }
.nav-links { list-style: none; display: flex; align-items: center; gap: clamp(.9rem, 2.2vw, 1.9rem); }
.nav-links a {
  font-family: var(--font-m); font-size: .74rem; letter-spacing: .12em; text-transform: uppercase;
  text-decoration: none; color: var(--ink-soft); padding: .35rem 0; position: relative;
  transition: color .2s ease;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1.5px; width: 0;
  background: var(--accent); transition: width .25s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-links a.active { color: var(--accent); }

.nav-tools { display: flex; align-items: center; gap: .8rem; }
.theme-toggle {
  width: 34px; height: 34px; border-radius: 9px; cursor: pointer;
  border: 1px solid var(--line); background: var(--bg-raised); color: var(--ink-soft);
  display: grid; place-items: center; transition: border-color .2s, color .2s, transform .2s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); transform: rotate(15deg); }
.theme-toggle svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; }

.nav-burger { display: none; }

@media (max-width: 860px) {
  .nav-burger {
    display: grid; place-items: center; gap: 0; width: 34px; height: 34px;
    background: none; border: 1px solid var(--line); border-radius: 9px; cursor: pointer;
  }
  .nav-burger span { display: block; width: 15px; height: 1.6px; background: var(--ink); margin: 1.8px 0; transition: transform .25s, opacity .25s; }
  .nav-burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.2px) rotate(45deg); }
  .nav-burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.2px) rotate(-45deg); }
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--bg-raised); border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height .3s ease;
  }
  .nav-links.open { max-height: 340px; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: .95rem clamp(1.2rem, 4vw, 2.5rem); font-size: .8rem; }
  .nav-links a::after { display: none; }
}

/* ---------- 4 · Hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center;
  padding: calc(var(--nav-h) + 4rem) 0 5rem;
  overflow: hidden;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
}
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero-fade {
  position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(90deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 78%, transparent) 42%, transparent 72%);
}
@media (max-width: 860px) {
  .hero-fade { background: linear-gradient(180deg, color-mix(in srgb, var(--bg) 60%, transparent), color-mix(in srgb, var(--bg) 40%, transparent)); }
}
.hero-inner { position: relative; z-index: 2; width: 100%; }
.hero-grid { max-width: 720px; }

.hero-name {
  font-size: clamp(2.7rem, 7.2vw, 5.2rem);
  font-weight: 600; line-height: 1.02; letter-spacing: -0.035em;
  margin: 1.3rem 0 0;
}
.hero-name em {
  font-family: var(--font-s); font-style: italic; font-weight: 400;
  color: var(--accent); letter-spacing: -0.02em;
}
.hero-sub {
  margin-top: 1.1rem; font-size: clamp(1rem, 1.7vw, 1.2rem);
  color: var(--ink-soft); font-weight: 400; max-width: 34ch; line-height: 1.45;
}
.hero-desc {
  margin-top: 1.4rem; max-width: 58ch; color: var(--ink-soft);
  font-size: .98rem; line-height: 1.75;
}
.hero-cta { margin-top: 2.2rem; display: flex; flex-wrap: wrap; gap: .8rem; }

.btn {
  font-family: var(--font-m); font-size: .78rem; letter-spacing: .1em; text-transform: uppercase;
  text-decoration: none; padding: .85rem 1.5rem; border-radius: 10px;
  display: inline-flex; align-items: center; gap: .55rem;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s, border-color .18s;
  cursor: pointer;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: #fff; border: 1px solid var(--accent); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 22px var(--accent-line); }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn .arr { transition: transform .18s ease; }
.btn:hover .arr { transform: translateX(3px); }

.hero-meta {
  margin-top: 2.6rem; display: flex; flex-wrap: wrap; gap: 1.6rem;
  font-family: var(--font-m); font-size: .74rem; letter-spacing: .05em;
}
.hero-meta a { color: var(--ink-faint); text-decoration: none; transition: color .2s; display: inline-flex; gap: .4rem; align-items: center; }
.hero-meta a:hover { color: var(--accent); }
.hero-meta .sep { color: var(--line); }

/* equations behind the canvas: dim layer + bright copy revealed around the source */
.hero-eq { position: absolute; inset: 0; z-index: 0; pointer-events: none; overflow: hidden;
  font-size: clamp(.62rem, 1.05vw, 1rem); }
.eq-set { position: absolute; inset: 0; opacity: 0; transition: opacity .7s ease; }
.eq-set.is-on { opacity: 1; }
.eq-layer { position: absolute; inset: 0; }
.eq-layer.dim { color: var(--ink); opacity: .15; }
.eq-layer.lit {
  color: var(--accent); opacity: .85;
  -webkit-mask-image: radial-gradient(circle 260px at var(--mx, -999px) var(--my, -999px), #000 0%, transparent 100%);
          mask-image: radial-gradient(circle 260px at var(--mx, -999px) var(--my, -999px), #000 0%, transparent 100%);
}
:root[data-theme="dark"] .eq-layer.dim { opacity: .2; }
.eq { position: absolute; white-space: nowrap; font-size: calc(1em * var(--k, 1.3)); line-height: 1.2; }
.eq .katex { font-size: 1em; }
@media (max-width: 700px) { .eq.long { display: none; } }

.sim-chip {
  position: absolute; right: clamp(1.2rem, 4vw, 2.5rem); bottom: 1.4rem; z-index: 3;
  display: flex; flex-direction: column; align-items: flex-end; gap: .5rem;
  max-width: calc(100% - 2.4rem); pointer-events: none;
}
.sim-tabs, .sim-cap {
  background: color-mix(in srgb, var(--bg-raised) 80%, transparent);
  border: 1px solid var(--line-soft); border-radius: 999px;
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.sim-tabs { display: flex; gap: 2px; padding: 3px; pointer-events: auto; }
.sim-tabs button {
  font-family: var(--font-m); font-size: .66rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-faint); background: none; border: 0; border-radius: 999px;
  padding: .42rem .85rem; cursor: pointer; transition: background .18s, color .18s;
}
.sim-tabs button:hover { color: var(--ink); }
.sim-tabs button[aria-pressed="true"] { background: var(--accent); color: #fff; }
.sim-cap {
  font-family: var(--font-m); font-size: .66rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-faint); padding: .45rem .95rem; display: flex; align-items: center; gap: .55rem;
}
.hero[data-bg="mesh"], .hero[data-bg="static"], .hero[data-bg="lattice"], .hero[data-bg="film"] { background-image: none; }
@media (max-width: 640px) { .hero { padding-bottom: 11.5rem; } .sim-tabs { flex-wrap: wrap; justify-content: flex-end; border-radius: 18px; } .sim-cap { letter-spacing: .06em; font-size: .6rem; } .sim-tabs button { padding: .4rem .3rem; font-size: .5rem; letter-spacing: .03em; } }
.sim-cap .pulse {
  width: 7px; height: 7px; border-radius: 50%; background: var(--ok);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; transform: scale(1);} 50% { opacity: .35; transform: scale(.75);} }

.scroll-hint {
  position: absolute; left: 50%; bottom: 1.3rem; transform: translateX(-50%); z-index: 3;
  color: var(--ink-faint); animation: hint 2.4s ease-in-out infinite; pointer-events: none;
}
.scroll-hint svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 1.6; }
@keyframes hint { 0%,100% { transform: translate(-50%, 0);} 50% { transform: translate(-50%, 7px);} }
@media (max-width: 860px) { .scroll-hint { display: none; } }

/* ---------- 5 · Sections ---------- */
.section { padding: clamp(4.5rem, 9vw, 7.5rem) 0; position: relative; }
.section-band { background: var(--bg-raised); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.sec-head { margin-bottom: clamp(2.2rem, 5vw, 3.6rem); display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.sec-title {
  font-size: clamp(1.9rem, 4.2vw, 3rem); font-weight: 600; letter-spacing: -0.03em; line-height: 1.08;
  margin-top: 1rem;
}
.sec-title em { font-family: var(--font-s); font-style: italic; font-weight: 400; color: var(--accent); }
.sec-note { font-family: var(--font-m); font-size: .72rem; color: var(--ink-faint); letter-spacing: .08em; max-width: 30ch; text-align: right; }
@media (max-width: 640px) { .sec-note { text-align: left; } }

/* ---------- 6 · Profile band ---------- */
.profile-grid { display: grid; grid-template-columns: 300px 1fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
@media (max-width: 860px) { .profile-grid { grid-template-columns: 1fr; } }

.photo-frame { position: relative; }
.photo-frame img {
  width: 100%; aspect-ratio: 4/4.6; object-fit: cover; border-radius: var(--r);
  filter: saturate(.92) contrast(1.02);
}
.photo-frame::after {
  content: ""; position: absolute; inset: 0; border-radius: var(--r);
  border: 1px solid var(--line); pointer-events: none;
}
.photo-frame .corner {
  position: absolute; width: 22px; height: 22px; border: 2px solid var(--accent); z-index: 2;
}
.photo-frame .corner.tl { top: -7px; left: -7px; border-right: none; border-bottom: none; }
.photo-frame .corner.br { bottom: -7px; right: -7px; border-left: none; border-top: none; }
.photo-cap { margin-top: .9rem; font-family: var(--font-m); font-size: .68rem; letter-spacing: .1em; color: var(--ink-faint); text-transform: uppercase; }

.aff-list { display: flex; flex-direction: column; }
.aff-item {
  display: grid; grid-template-columns: 1fr; gap: .2rem;
  padding: 1.15rem 0; border-bottom: 1px solid var(--line-soft);
}
.aff-item:first-child { padding-top: 0; }
.aff-title { font-weight: 600; font-size: 1.02rem; letter-spacing: -0.01em; }
.aff-title span { color: var(--accent); font-weight: 500; }
.aff-sub { color: var(--ink-faint); font-size: .85rem; }

.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: var(--r); overflow: hidden; margin-top: 2rem; }
@media (max-width: 640px) { .stat-grid { grid-template-columns: repeat(2, 1fr); } }
.stat { background: var(--bg-raised); padding: 1.4rem 1.2rem; }
.stat b { display: block; font-family: var(--font-m); font-weight: 600; font-size: clamp(1.7rem, 3.4vw, 2.4rem); color: var(--accent); letter-spacing: -0.02em; line-height: 1; }
.stat b sup { font-size: .55em; }
.stat span { display: block; margin-top: .45rem; font-family: var(--font-m); font-size: .68rem; text-transform: uppercase; letter-spacing: .12em; color: var(--ink-faint); }

/* ---------- 7 · Theme cards ---------- */
.themes-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(268px, 1fr)); gap: 1rem; }
.theme-card {
  position: relative; background: var(--bg-raised); border: 1px solid var(--line-soft);
  border-radius: var(--r); padding: 1.6rem 1.5rem 1.5rem; overflow: hidden;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
a.theme-link { display: block; color: inherit; text-decoration: none; }
.theme-card .t-more { display: inline-block; margin-top: .9rem; font-family: var(--font-m); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.theme-card:hover { transform: translateY(-4px); border-color: var(--accent-line); box-shadow: var(--shadow); }
.theme-card .t-num {
  position: absolute; top: 1.15rem; right: 1.3rem;
  font-family: var(--font-m); font-size: .68rem; color: var(--ink-faint); letter-spacing: .1em;
}
.theme-card .t-icon {
  width: 44px; height: 44px; border-radius: 11px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent);
  font-size: 1.25rem; font-family: var(--font-s); font-style: italic;
  transition: transform .25s ease;
}
.theme-card:hover .t-icon { transform: scale(1.08) rotate(-4deg); }
.theme-card h3 { margin-top: 1.05rem; font-size: 1.04rem; font-weight: 600; letter-spacing: -0.015em; line-height: 1.3; }
.theme-card p { margin-top: .55rem; font-size: .86rem; color: var(--ink-soft); line-height: 1.65; }

/* ---------- 8 · Timeline ---------- */
.timeline { position: relative; max-width: 780px; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 1.5px;
  background: linear-gradient(var(--accent-line), var(--line-soft));
}
.tl-item { position: relative; padding: 0 0 2.4rem 2.5rem; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: 0; top: 7px; width: 15px; height: 15px;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--accent);
  transition: background .25s ease, transform .25s ease;
}
.tl-item:hover::before { background: var(--accent); transform: scale(1.15); }
.tl-years { font-family: var(--font-m); font-size: .72rem; letter-spacing: .12em; color: var(--accent); text-transform: uppercase; }
.tl-title { margin-top: .35rem; font-size: 1.12rem; font-weight: 600; letter-spacing: -0.015em; }
.tl-sub { margin-top: .45rem; color: var(--ink-soft); font-size: .89rem; line-height: 1.7; max-width: 62ch; }

/* ---------- 9 · Footer ---------- */
.site-footer { border-top: 1px solid var(--line-soft); background: var(--bg-raised); }
.foot-cta { padding: clamp(3.5rem, 8vw, 6rem) 0 2.5rem; }
.foot-cta h2 { font-size: clamp(1.8rem, 4.6vw, 3.2rem); font-weight: 600; letter-spacing: -0.03em; line-height: 1.08; max-width: 18ch; }
.foot-cta h2 em { font-family: var(--font-s); font-style: italic; font-weight: 400; color: var(--accent); }
.foot-cta .btn { margin-top: 1.8rem; }
.foot-grid {
  display: flex; justify-content: space-between; align-items: flex-end; gap: 2rem; flex-wrap: wrap;
  padding-bottom: 2.5rem; border-bottom: 1px solid var(--line-soft);
}
.foot-links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.foot-links a { font-family: var(--font-m); font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); text-decoration: none; transition: color .2s; }
.foot-links a:hover { color: var(--accent); }
.foot-base { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding: 1.4rem 0 1.8rem; font-family: var(--font-m); font-size: .68rem; color: var(--ink-faint); letter-spacing: .06em; }

/* ---------- 10 · Sub-page headers ---------- */
.page-head { padding: calc(var(--nav-h) + clamp(3rem, 7vw, 5.5rem)) clamp(1.2rem, 4vw, 2.5rem) clamp(2.4rem, 5vw, 3.8rem); }
.page-title { font-size: clamp(2.4rem, 6vw, 4.2rem); font-weight: 600; letter-spacing: -0.035em; line-height: 1.04; margin-top: 1.1rem; }
.page-title em { font-family: var(--font-s); font-style: italic; font-weight: 400; color: var(--accent); }
.page-summary { margin-top: 1.3rem; font-family: var(--font-m); font-size: .78rem; letter-spacing: .06em; color: var(--ink-faint); }
.page-intro { margin-top: 1.5rem; max-width: 68ch; color: var(--ink-soft); font-size: 1.02rem; line-height: 1.8; }
.page-intro em { font-family: var(--font-s); color: var(--ink); }

/* ---------- 11 · Research: philosophy + tabs ---------- */
.philosophy { border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); background: var(--bg-raised); }
.philosophy-inner { max-width: 860px; margin: 0 auto; padding: clamp(2.8rem, 6vw, 4.5rem) clamp(1.2rem, 4vw, 2.5rem); position: relative; }
.philosophy-inner::before {
  content: "\201C"; position: absolute; top: .8rem; left: clamp(1.2rem, 4vw, 2.5rem);
  font-family: var(--font-s); font-size: 5rem; line-height: 1; color: var(--accent-line);
}
.philosophy-quote { font-family: var(--font-s); font-size: clamp(1.15rem, 2.4vw, 1.5rem); font-style: italic; line-height: 1.65; padding-top: 2.2rem; }
.philosophy-quote em { color: var(--accent); }
.philosophy-attr { margin-top: 1.4rem; font-family: var(--font-m); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-faint); }

.tabs-wrapper { display: grid; grid-template-columns: 280px 1fr; gap: clamp(1.6rem, 4vw, 3.5rem); align-items: start; }
@media (max-width: 960px) { .tabs-wrapper { grid-template-columns: 1fr; } }

.tab-nav { position: sticky; top: calc(var(--nav-h) + 1.4rem); display: flex; flex-direction: column; gap: .35rem; }
@media (max-width: 960px) { .tab-nav { position: static; flex-direction: row; flex-wrap: wrap; } }
.tab-btn {
  display: flex; align-items: center; gap: .85rem; text-align: left; cursor: pointer;
  background: none; border: 1px solid transparent; border-radius: 11px;
  padding: .8rem 1rem; color: var(--ink-soft); font-family: var(--font-d); font-size: .88rem; line-height: 1.3;
  transition: background .2s, color .2s, border-color .2s;
}
.tab-btn .roman { font-family: var(--font-m); font-size: .7rem; color: var(--ink-faint); width: 2.2em; flex: none; letter-spacing: .06em; }
.tab-btn:hover { background: var(--accent-soft); color: var(--ink); }
.tab-btn.active { background: var(--accent-soft); border-color: var(--accent-line); color: var(--ink); font-weight: 600; }
.tab-btn.active .roman { color: var(--accent); }
@media (max-width: 960px) { .tab-btn { padding: .55rem .8rem; font-size: .8rem; } .tab-btn br { display: none; } }

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: panelIn .4s ease both; }
@keyframes panelIn { from { opacity: 0; transform: translateY(10px);} to { opacity: 1; transform: none;} }
.tab-panel h2 { font-size: clamp(1.35rem, 2.6vw, 1.85rem); font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; }
.tab-panel .panel-rule { width: 44px; height: 3px; border-radius: 2px; background: var(--accent); margin: 1.1rem 0 1.5rem; }
.tab-panel p { color: var(--ink-soft); font-size: .95rem; line-height: 1.85; margin-bottom: 1.1rem; }
.tab-panel p strong { color: var(--ink); font-weight: 600; }
.tab-panel p em { font-family: var(--font-s); color: var(--ink); }

.kp-block { margin-top: 1.6rem; border: 1px solid var(--line-soft); border-radius: var(--r); background: var(--bg-raised); padding: 1.4rem 1.5rem; }
.kp-label { font-family: var(--font-m); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin-bottom: .9rem; }
.kp-list { list-style: none; }
.kp-list li { position: relative; padding: .42rem 0 .42rem 1.4rem; font-size: .88rem; color: var(--ink-soft); line-height: 1.6; }
.kp-list li::before { content: "▸"; position: absolute; left: 0; color: var(--accent); font-size: .8rem; top: .52rem; }

.tab-table { margin-top: 1.6rem; overflow-x: auto; }
.tab-table table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.tab-table caption { text-align: left; font-family: var(--font-m); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); padding-bottom: .7rem; }
.tab-table th { font-family: var(--font-m); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); text-align: left; padding: .6rem .9rem; border-bottom: 1px solid var(--line); }
.tab-table td { padding: .7rem .9rem; border-bottom: 1px solid var(--line-soft); color: var(--ink-soft); }
.tab-table tr.hl td { background: var(--accent-soft); color: var(--ink); }

.tab-links { margin-top: 1.6rem; display: flex; flex-wrap: wrap; gap: .7rem; }
.tab-links a, .tab-links span {
  font-family: var(--font-m); font-size: .72rem; letter-spacing: .08em;
  padding: .6rem 1.05rem; border-radius: 999px; text-decoration: none;
  border: 1px solid var(--line); transition: border-color .2s, color .2s, transform .2s;
}
.tab-links a { color: var(--ink); }
.tab-links a:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.tab-links span { color: var(--ink-faint); border-style: dashed; }

/* ---------- 12 · Publications ---------- */
.pub-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: var(--r); overflow: hidden; margin-bottom: 2.4rem; }
@media (max-width: 640px) { .pub-stats { grid-template-columns: repeat(2, 1fr); } }

.filter-bar { display: flex; flex-wrap: wrap; gap: .55rem; margin-bottom: 2.6rem; }
.filter-btn {
  font-family: var(--font-m); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase;
  padding: .55rem 1.1rem; border-radius: 999px; cursor: pointer;
  background: var(--bg-raised); color: var(--ink-soft); border: 1px solid var(--line);
  transition: all .2s ease;
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.pub-group { margin-bottom: 3rem; }
.pub-group-head { display: flex; align-items: baseline; gap: .9rem; margin-bottom: 1.3rem; }
.pub-group-head .g-icon { font-family: var(--font-s); font-style: italic; color: var(--accent); font-size: 1.3rem; }
.pub-group-head h2 { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.015em; }
.pub-group-head .g-count { font-family: var(--font-m); font-size: .7rem; color: var(--ink-faint); letter-spacing: .08em; }

.pub-item {
  display: grid; grid-template-columns: 3.2rem 1fr; gap: 1rem;
  padding: 1.05rem 1rem 1.05rem .6rem; border-radius: 12px; position: relative;
  border-bottom: 1px solid var(--line-soft);
  transition: background .2s ease;
}
.pub-item::before {
  content: ""; position: absolute; left: 0; top: 14%; bottom: 14%; width: 2.5px; border-radius: 2px;
  background: var(--accent); opacity: 0; transition: opacity .2s ease;
}
.pub-item:hover { background: var(--accent-soft); }
.pub-item:hover::before { opacity: 1; }
.pub-num { font-family: var(--font-m); font-size: .74rem; color: var(--ink-faint); padding-top: .2rem; }
.pub-body .p-title { font-weight: 600; font-size: .98rem; letter-spacing: -0.01em; line-height: 1.45; }
.pub-body .p-title a { text-decoration: none; color: inherit; transition: color .2s; }
.pub-body .p-title a:hover { color: var(--accent); }
.pub-body .p-meta { margin-top: .3rem; font-size: .84rem; color: var(--ink-soft); }
.pub-body .p-meta strong { color: var(--ink); font-weight: 600; }
.pub-body .p-venue { margin-top: .2rem; font-family: var(--font-m); font-size: .72rem; color: var(--ink-faint); letter-spacing: .03em; }
.pub-body .p-venue a { color: var(--accent); text-decoration: none; }
.pub-body .p-venue a:hover { text-decoration: underline; }

.tag {
  display: inline-block; font-family: var(--font-m); font-size: .62rem; letter-spacing: .1em; text-transform: uppercase;
  padding: .2rem .6rem; border-radius: 999px; margin-left: .6rem; vertical-align: middle;
  background: var(--accent-soft); color: var(--accent); border: 1px solid var(--accent-line);
}
.tag.under-review { background: rgba(217, 119, 6, .1); color: var(--signal); border-color: rgba(217, 119, 6, .35); }

/* ---------- 13 · Honors ---------- */
.honor-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; }
.honor-card {
  background: var(--bg-raised); border: 1px solid var(--line-soft); border-radius: var(--r);
  padding: 1.5rem 1.5rem 1.4rem; position: relative; overflow: hidden;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.honor-card:hover { transform: translateY(-4px); border-color: var(--accent-line); box-shadow: var(--shadow); }
.honor-year {
  font-family: var(--font-m); font-weight: 600; font-size: 1.9rem; letter-spacing: -0.02em;
  color: var(--accent); opacity: .85; line-height: 1;
}
.honor-name { margin-top: .8rem; font-weight: 600; font-size: 1rem; line-height: 1.4; letter-spacing: -0.01em; }
.honor-inst { margin-top: .4rem; font-size: .84rem; color: var(--ink-soft); }
.honor-loc { margin-top: .25rem; font-family: var(--font-m); font-size: .68rem; color: var(--ink-faint); letter-spacing: .04em; }
.honor-card .tag { margin: .95rem 0 0; margin-left: 0; }
.tag.fellowship { background: var(--accent-soft); color: var(--accent); border-color: var(--accent-line); }
.tag.travel { background: rgba(15, 118, 110, .1); color: var(--ok); border-color: rgba(15, 118, 110, .35); }
.tag.scholarship { background: rgba(217, 119, 6, .1); color: var(--signal); border-color: rgba(217, 119, 6, .35); }

/* ---------- 14 · Article (research detail) ---------- */
.article { max-width: 820px; margin: 0 auto; padding-bottom: clamp(4rem, 8vw, 6rem); }
.article p { color: var(--ink-soft); font-size: .98rem; line-height: 1.85; margin-bottom: 1.2rem; }
.article p strong { color: var(--ink); }
.article p em { font-family: var(--font-s); color: var(--ink); }
.article h2 { font-size: 1.5rem; font-weight: 600; letter-spacing: -0.02em; margin: 2.4rem 0 1rem; }
.fig-grid { display: grid; grid-template-columns: 1fr; gap: 1.2rem; margin: 2rem 0; }
.fig-card { background: var(--bg-raised); border: 1px solid var(--line-soft); border-radius: var(--r); overflow: hidden; }
.fig-card img { width: 100%; }
.fig-card figcaption { padding: .9rem 1.2rem; font-family: var(--font-m); font-size: .7rem; letter-spacing: .08em; color: var(--ink-faint); text-transform: uppercase; border-top: 1px solid var(--line-soft); }
.back-link { display: inline-flex; align-items: center; gap: .5rem; font-family: var(--font-m); font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); text-decoration: none; margin-bottom: 1rem; transition: color .2s; }
.back-link:hover { color: var(--accent); }

/* ---------- 15 · Reveal animations ---------- */
[data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity .7s cubic-bezier(.2,.65,.25,1), transform .7s cubic-bezier(.2,.65,.25,1); transition-delay: var(--d, 0s); }
[data-reveal].revealed { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- 16 · Print ---------- */
@media print {
  .site-nav, .theme-toggle, .scroll-hint, .sim-chip, .hero-canvas, .filter-bar { display: none !important; }
  body { background: #fff; color: #000; }
}

/* wide single-column figure stacks for animations */
.article-wide { max-width: 1100px; }
.article-wide > p, .article-wide > h2 { max-width: 820px; margin-left: auto; margin-right: auto; }
.fig-note { font-family: var(--font-m); font-size: .7rem; letter-spacing: .04em; color: var(--ink-faint); }

/* theory section */
.article .eq { position: static; font-size: 1em; line-height: 1.6; overflow-x: auto; margin: 1.1rem 0 1.4rem; padding: .2rem 0; text-align: center; color: var(--ink); }
.article .cond { background: var(--bg-raised); border: 1px solid var(--line-soft); border-left: 3px solid var(--accent); border-radius: var(--r); padding: 1.2rem 1.5rem .4rem; margin: 1.6rem 0; }
.article .cond h3 { font-size: 1.05rem; font-weight: 600; letter-spacing: -0.01em; margin-bottom: .7rem; }
.article .plain-list { color: var(--ink-soft); font-size: .98rem; line-height: 1.8; margin: 0 0 1.4rem 1.2rem; }
.article .plain-list li { margin-bottom: .5rem; }
.article-wide > .eq, .article-wide > .cond, .article-wide > .plain-list, .article-wide > .tab-links { max-width: 820px; margin-left: auto; margin-right: auto; }
.article h3.sub { font-size: 1.15rem; font-weight: 600; letter-spacing: -0.01em; margin: 2rem 0 .7rem; }
.article-wide > h3.sub { max-width: 820px; margin-left: auto; margin-right: auto; }
.article .ref { font-size: .88rem; }
.article .ref a, .article sup a { color: var(--accent); text-decoration: none; }

/* ---------- Projects: filter chips + cards ---------- */
[hidden], a.proj-card[hidden] { display: none !important; }
.filter-bar { display: flex; flex-wrap: wrap; gap: .55rem; margin-bottom: 1.6rem; }
.chip {
  font-family: var(--font-m); font-size: .74rem; letter-spacing: .06em; cursor: pointer;
  padding: .5rem .95rem; border-radius: 999px; background: var(--bg-raised); color: var(--ink-soft);
  border: 1px solid var(--line); transition: border-color .2s ease, color .2s ease, background .2s ease;
}
.chip b { font-weight: 500; color: var(--ink-faint); margin-left: .3rem; }
.chip:hover { border-color: var(--accent); color: var(--ink); }
.chip.active { background: var(--accent-soft); border-color: var(--accent-line); color: var(--accent); }
.chip.active b { color: var(--accent); }
a.proj-card { display: flex; flex-direction: column; }
.proj-card h3 { margin-top: .9rem; }
.proj-card p { flex: 1; }
.p-tags { display: flex; flex-wrap: wrap; gap: .4rem; }
.p-tag { font-family: var(--font-m); font-size: .62rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); border: 1px solid var(--line-soft); border-radius: 999px; padding: .22rem .6rem; }
.p-tag.main { color: var(--accent); border-color: var(--accent-line); background: var(--accent-soft); }
.sec-more { margin-top: 1.6rem; }

/* ---------- Grouped themes + tab groups ---------- */
.theme-group + .theme-group { margin-top: 2.4rem; }
.group-head { display: flex; align-items: baseline; gap: .8rem; margin-bottom: 1rem; padding-bottom: .7rem; border-bottom: 1px solid var(--line-soft); }
.group-title { font-family: var(--font-m); font-size: .78rem; font-weight: 500; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.group-count { font-family: var(--font-m); font-size: .7rem; color: var(--ink-faint); }
.group-link { margin-left: auto; font-family: var(--font-m); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-soft); text-decoration: none; }
.group-link:hover { color: var(--accent); }
.tab-group { font-family: var(--font-m); font-size: .64rem; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-faint); padding: 1rem 1rem .25rem; }
.tab-nav .tab-group:first-child { padding-top: 0; }
@media (max-width: 960px) { .tab-group { width: 100%; padding: .6rem 0 .1rem; } }

/* =====================================================================
   17 · Positioning layer: hero headline + chain, credibility strip,
        What I Build, featured blocks, flow diagrams, structured projects,
        research architecture, status blocks.  Uses the tokens above only.
   ===================================================================== */

/* ---------- hero headline + chain ---------- */
.hero-sub.is-headline {
  font-size: clamp(1.5rem, 3.3vw, 2.35rem); font-weight: 500; color: var(--ink);
  letter-spacing: -0.025em; line-height: 1.12; max-width: 20ch;
}
.hero-sub.is-headline em { font-family: var(--font-s); font-style: italic; font-weight: 400; color: var(--accent); }
.hero-chain {
  margin-top: 1.7rem; display: flex; flex-wrap: wrap; align-items: center; gap: .4rem .45rem;
  font-family: var(--font-m); font-size: .66rem; letter-spacing: .08em; text-transform: uppercase;
}
.hero-chain .node {
  color: var(--ink-soft); border: 1px solid var(--line); border-radius: 999px; padding: .34rem .7rem;
  background: color-mix(in srgb, var(--bg-raised) 82%, transparent);
}
.hero-chain .node:last-child { color: var(--accent); border-color: var(--accent-line); background: var(--accent-soft); }
.hero-chain .arr { color: var(--accent); opacity: .8; }
.hero-cta { margin-top: 1.9rem; }

/* ---------- credibility strip ---------- */
.cred { background: var(--bg-raised); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.cred-inner { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); gap: clamp(1rem, 3vw, 3rem); align-items: center; padding-top: 1.6rem; padding-bottom: 1.6rem; }
.cred-lead p:not(.kicker) { margin-top: .6rem; font-size: .9rem; color: var(--ink-soft); line-height: 1.6; max-width: 40ch; }
.cred .kicker { font-size: .66rem; }
.cred .stat-grid { margin-top: 0; border-radius: 12px; }
.cred .stat { background: var(--bg); padding: 1rem 1rem; }
.cred .stat b { font-size: clamp(1.4rem, 2.6vw, 1.9rem); }
@media (max-width: 860px) { .cred-inner { grid-template-columns: 1fr; } }

/* ---------- What I Build ---------- */
.build-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
@media (max-width: 960px) { .build-grid { grid-template-columns: 1fr; } }
.build-card {
  position: relative; display: flex; flex-direction: column; text-decoration: none; color: inherit;
  background: var(--bg-raised); border: 1px solid var(--line-soft); border-radius: var(--r);
  padding: 1.6rem 1.5rem 1.4rem;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.build-card:hover { transform: translateY(-4px); border-color: var(--accent-line); box-shadow: var(--shadow); }
.b-head { display: flex; align-items: baseline; gap: .8rem; }
.b-num { font-family: var(--font-m); font-size: .72rem; color: var(--ink-faint); letter-spacing: .1em; }
.b-label { font-family: var(--font-m); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.build-card h3 { margin-top: 1rem; font-size: 1.15rem; font-weight: 600; letter-spacing: -0.02em; line-height: 1.25; }
.build-card p { margin-top: .7rem; font-size: .88rem; color: var(--ink-soft); line-height: 1.7; flex: 1; }
.k-chips { margin-top: 1rem; display: flex; flex-wrap: wrap; gap: .4rem; }
.k-chip { font-family: var(--font-m); font-size: .64rem; letter-spacing: .06em; color: var(--ink-soft); border: 1px solid var(--line-soft); border-radius: 999px; padding: .26rem .62rem; }
.build-card .t-more { margin-top: 1.1rem; font-family: var(--font-m); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
/* the foundation card: wide, with an accent rule on top */
.build-card.is-base { grid-column: 1 / -1; border-top: 3px solid var(--accent); background: var(--bg-inset); }
.build-card.is-base p { max-width: 78ch; flex: none; }
.caps { margin-top: 2.2rem; padding-top: 1.4rem; border-top: 1px solid var(--line-soft); display: grid; grid-template-columns: 13rem 1fr; gap: .8rem 2rem; align-items: baseline; }
@media (max-width: 860px) { .caps { grid-template-columns: 1fr; } }
.caps-label { font-family: var(--font-m); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-faint); }
.caps ul { list-style: none; display: flex; flex-wrap: wrap; gap: .5rem 1.8rem; }
.caps li { font-size: .9rem; color: var(--ink-soft); }
.caps li::before { content: "▸ "; color: var(--accent); }

/* ---------- featured blocks ---------- */
.feature { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
.feature-flip { grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr); }
@media (max-width: 960px) { .feature, .feature-flip { grid-template-columns: 1fr; } }
.feature-text p { color: var(--ink-soft); font-size: .98rem; line-height: 1.8; margin-bottom: 1.1rem; max-width: 64ch; }
.feature-text p strong { color: var(--ink); font-weight: 600; }
.proof-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: var(--r); overflow: hidden; margin: 1.6rem 0 1.3rem; }
@media (max-width: 640px) { .proof-row { grid-template-columns: 1fr; } }
.proof { background: var(--bg); padding: 1.05rem 1rem; }
.proof b { display: block; font-family: var(--font-m); font-weight: 600; font-size: 1.2rem; color: var(--accent); letter-spacing: -0.02em; line-height: 1.15; }
.proof b sup { font-size: .6em; }
.proof span { display: block; margin-top: .45rem; font-size: .74rem; color: var(--ink-faint); line-height: 1.5; }
.feature-text p.scope { font-size: .84rem; color: var(--ink-faint); border-left: 2px solid var(--line); padding-left: .9rem; }
.feature-text p.scope strong { color: var(--ink-soft); }
.feature-text p.status-line { font-family: var(--font-m); font-size: .68rem; letter-spacing: .05em; color: var(--ink-soft); line-height: 1.9; }
.status-item { display: block; }
.s-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin: 0 .55rem 0 0; vertical-align: middle; }
.s-dot.done { background: var(--ok); } .s-dot.ongoing { background: var(--signal); } .s-dot.next { background: var(--ink-faint); }
@media (min-width: 961px) { .feature > .flow-card { position: sticky; top: calc(var(--nav-h) + 1.5rem); } }
.feature-links { margin-top: 1.6rem; display: flex; flex-wrap: wrap; gap: .7rem; }
.op-list { list-style: none; margin: 0 0 .4rem; }
.op-list li { position: relative; padding: .5rem 0 .5rem 1.3rem; font-size: .9rem; color: var(--ink-soft); line-height: 1.65; border-bottom: 1px solid var(--line-soft); }
.op-list li::before { content: "▸"; position: absolute; left: 0; color: var(--accent); }
.op-list li b { color: var(--ink); font-weight: 600; }

/* ---------- flow diagrams ---------- */
.flow-card { background: var(--bg); border: 1px solid var(--line-soft); border-radius: var(--r); padding: 1.6rem 1.5rem 1.3rem; }
.section-band .flow-card { background: var(--bg); }
.flow-label { font-family: var(--font-m); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin-bottom: 1.3rem; }
.flow { list-style: none; counter-reset: fstep; }
.flow li { position: relative; padding: 0 0 1.15rem 2.9rem; counter-increment: fstep; }
.flow li::before {
  content: counter(fstep); position: absolute; left: 0; top: 0; width: 28px; height: 28px; border-radius: 8px;
  display: grid; place-items: center; background: var(--accent-soft); border: 1px solid var(--accent-line);
  color: var(--accent); font-family: var(--font-m); font-size: .7rem;
}
.flow li::after { content: ""; position: absolute; left: 13.5px; top: 32px; bottom: 3px; width: 1.5px; background: var(--line); }
.flow li:last-child { padding-bottom: 0; }
.flow li:last-child::after { display: none; }
.flow li.key::before { background: var(--accent); color: #fff; border-color: var(--accent); }
.flow .f-t { display: block; font-weight: 600; font-size: .95rem; letter-spacing: -0.01em; line-height: 1.3; color: var(--ink); }
.flow .f-m { display: block; margin-top: .15rem; font-family: var(--font-m); font-size: .76rem; color: var(--accent); }
.flow .f-s { display: block; margin-top: .2rem; font-size: .82rem; color: var(--ink-soft); line-height: 1.55; }
.flow .f-tag { font-style: normal; font-family: var(--font-m); font-size: .58rem; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); border: 1px solid var(--accent-line); background: var(--accent-soft); border-radius: 999px; padding: .12rem .5rem; margin-left: .4rem; vertical-align: middle; }
.flow-loop { margin-top: 1.1rem; padding-top: .9rem; border-top: 1px dashed var(--line); font-family: var(--font-m); font-size: .7rem; color: var(--ink-faint); letter-spacing: .05em; }

.opdiag { display: flex; flex-direction: column; }
.op-in { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .5rem; }
.op-in span { font-family: var(--font-m); font-size: .68rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-soft); border: 1px solid var(--line); border-radius: 10px; padding: .6rem .5rem; text-align: center; background: var(--bg-raised); }
.op-arrow { text-align: center; color: var(--accent); font-family: var(--font-m); font-size: 1rem; line-height: 1; padding: .5rem 0; }
.op-box { border: 1px solid var(--line); border-radius: 12px; padding: .9rem 1rem; text-align: center; background: var(--bg-raised); }
.op-box b { display: block; font-weight: 600; font-size: .98rem; letter-spacing: -0.01em; }
.op-box small { display: block; margin-top: .25rem; font-family: var(--font-m); font-size: .66rem; letter-spacing: .05em; color: var(--ink-faint); line-height: 1.5; }
.op-core { border-color: var(--accent-line); background: var(--accent-soft); }
.op-core b { color: var(--accent); }
.op-val { border-style: dashed; }
.flow-card .fig-note { margin-top: 1.1rem; line-height: 1.6; }
.article .flow-card { margin: 1.8rem 0; }
.article-wide > .flow-card, .article-wide > .glance { max-width: 820px; margin-left: auto; margin-right: auto; }

/* ---------- structured project cards ---------- */
.proj-struct h3 { margin-top: .9rem; font-size: 1.12rem; }
.proj-struct p.why { margin-top: .6rem; flex: none; font-size: .9rem; font-weight: 500; color: var(--ink); line-height: 1.55; }
.pstruct { margin-top: 1rem; flex: 1; }
.pstruct > div { display: grid; grid-template-columns: 6.8rem minmax(0, 1fr); gap: .9rem; padding: .55rem 0; border-top: 1px solid var(--line-soft); }
.pstruct dt { font-family: var(--font-m); font-size: .6rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); padding-top: .22rem; line-height: 1.5; }
.pstruct dd { font-size: .83rem; color: var(--ink-soft); line-height: 1.55; }
.pstruct dd sup { font-size: .7em; }
@media (max-width: 520px) { .pstruct > div { grid-template-columns: 1fr; gap: .15rem; } }
.proj-grid, #projects-grid { grid-template-columns: repeat(auto-fill, minmax(min(100%, 430px), 1fr)); }
.proj-grid > a.proj-card:last-child:nth-child(odd) { grid-column: 1 / -1; }
.p-status { font-family: var(--font-m); font-size: .62rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-soft); display: inline-flex; align-items: center; gap: .4rem; padding: .22rem .6rem; border: 1px solid var(--line-soft); border-radius: 999px; }
.p-status::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--ok); }
.p-status.s-ongoing::before { background: var(--signal); }
.p-status.s-next::before { background: var(--ink-faint); }

/* ---------- profile bio ---------- */
.profile-bio { color: var(--ink-soft); font-size: .98rem; line-height: 1.8; max-width: 62ch; margin-bottom: 1.6rem; }

/* ---------- research: architecture overview ---------- */
.arch-sec { padding-top: 0; }
.arch { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border: 1px solid var(--line-soft); border-radius: var(--r); overflow: hidden; background: var(--bg-raised); }
@media (max-width: 960px) { .arch { grid-template-columns: 1fr; } }
.arch-stage { position: relative; padding: 1.3rem 1.2rem 1.2rem; border-left: 1px solid var(--line-soft); }
.arch-stage:first-child { border-left: none; }
@media (max-width: 960px) { .arch-stage { border-left: none; border-top: 1px solid var(--line-soft); } .arch-stage:first-child { border-top: none; } }
.arch-n { font-family: var(--font-m); font-size: .66rem; color: var(--ink-faint); letter-spacing: .1em; }
.arch-stage h3 { margin-top: .5rem; font-size: 1rem; font-weight: 600; letter-spacing: -0.015em; line-height: 1.25; }
.arch-stage p { margin-top: .5rem; font-size: .8rem; color: var(--ink-soft); line-height: 1.6; }
.arch-links { margin-top: .8rem; display: flex; flex-wrap: wrap; gap: .35rem; }
.arch-links a { font-family: var(--font-m); font-size: .62rem; letter-spacing: .05em; padding: .24rem .55rem; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-soft); text-decoration: none; transition: border-color .2s, color .2s; }
.arch-links a:hover { border-color: var(--accent); color: var(--accent); }
.arch-stage:not(:last-child)::after { content: "→"; position: absolute; right: -9px; top: 1.15rem; z-index: 2; width: 18px; height: 18px; display: grid; place-items: center; background: var(--bg-raised); color: var(--accent); font-family: var(--font-m); font-size: .8rem; }
@media (max-width: 960px) { .arch-stage:not(:last-child)::after { content: "↓"; right: auto; left: 1.2rem; top: auto; bottom: -9px; } }

/* ---------- research tabs: lead, collapsible detail, status ---------- */
.tab-panel p.lead { font-size: 1.04rem; line-height: 1.75; color: var(--ink); }
.deep { margin-top: 1.5rem; border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.deep > summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; padding: 1rem 0; font-family: var(--font-m); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.deep > summary::-webkit-details-marker { display: none; }
.deep > summary::after { content: "+"; font-size: 1.1rem; line-height: 1; }
.deep[open] > summary::after { content: "−"; }
.deep > summary:hover { color: var(--ink); }
.deep-body { padding: .4rem 0 .4rem; }
.deep-body p:last-child { margin-bottom: .6rem; }
.status-wrap { margin-top: 1.6rem; }
.status-block { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: var(--r); overflow: hidden; }
.status-col { background: var(--bg-raised); padding: 1.15rem 1.2rem 1rem; }
.status-col h4 { font-family: var(--font-m); font-size: .64rem; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft); display: flex; align-items: center; gap: .5rem; font-weight: 500; }
.status-col h4::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--ok); }
.status-col.s-ongoing h4::before { background: var(--signal); }
.status-col.s-next h4::before { background: var(--ink-faint); }
.status-col ul { list-style: none; margin-top: .7rem; }
.status-col li { font-size: .82rem; color: var(--ink-soft); line-height: 1.55; padding: .32rem 0; border-top: 1px solid var(--line-soft); }
.status-col li:first-child { border-top: none; }

/* ---------- project pages: at-a-glance block ---------- */
.glance { background: var(--bg-raised); border: 1px solid var(--line-soft); border-radius: var(--r); padding: 1.3rem 1.5rem .8rem; margin: 0 0 1.8rem; }
.glance .kp-label { margin-bottom: .4rem; }
.glance .pstruct { margin-top: 0; }
.glance .pstruct > div:first-child { border-top: none; }


/* =====================================================================
   18 · Second positioning pass: tagline, flagship cards, pipeline items,
        featured project blocks, four-level results, foundation + books,
        research-to-product, focus styles.
   ===================================================================== */

/* keyboard focus: visible everywhere */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.hero-tagline { margin-top: .9rem; max-width: 52ch; font-family: var(--font-m); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-soft); line-height: 1.7; }

/* credibility strip: linked cells + sub-labels */
.stat.is-link { display: block; text-decoration: none; color: inherit; transition: background .2s ease; }
.stat.is-link:hover { background: var(--accent-soft); }
.stat .stat-sub { display: block; margin-top: .3rem; font-style: normal; font-family: var(--font-m); font-size: .62rem; letter-spacing: .03em; color: var(--ink-soft); line-height: 1.45; }

/* What I Build: the flagship card is wider */
.build-grid { grid-template-columns: 1.4fr 1fr 1fr; }
@media (max-width: 960px) { .build-grid { grid-template-columns: 1fr; } }
.build-card.is-flagship { border-color: var(--accent-line); }
.b-flag { margin-left: auto; font-family: var(--font-m); font-size: .58rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); border: 1px solid var(--accent-line); background: var(--accent-soft); border-radius: 999px; padding: .15rem .55rem; }
.caps-rel { margin-top: 1rem; font-size: .86rem; color: var(--ink-soft); line-height: 1.7; max-width: 80ch; }

/* pipeline stages carry their vocabulary */
.arch-items { list-style: none; margin-top: .7rem; }
.arch-items li { font-family: var(--font-m); font-size: .7rem; letter-spacing: .03em; color: var(--ink-soft); padding: .18rem 0; line-height: 1.5; }
.arch-items li::before { content: "· "; color: var(--accent); }
.section-band .arch { background: var(--bg); }
.section-band .arch-stage:not(:last-child)::after { background: var(--bg); }

/* featured project blocks */
.feature-block { padding-top: clamp(1.4rem, 3vw, 2rem); }
.feature-block + .feature-block { margin-top: clamp(2.6rem, 5vw, 3.8rem); padding-top: clamp(2.6rem, 5vw, 3.8rem); border-top: 1px solid var(--line-soft); }
.feature-kicker { font-family: var(--font-m); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); }
.feature-h { margin: .6rem 0 1.6rem; font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 600; letter-spacing: -0.025em; line-height: 1.15; }
.feature-text p.feature-lead { font-size: 1.04rem; color: var(--ink); line-height: 1.7; }
.feature-text .pstruct { margin-top: 1.3rem; }
.feature-text .pstruct > div:last-child { border-bottom: 1px solid var(--line-soft); }
.res-list { list-style: none; margin: 0; }
.res-list li { padding: .3rem 0; font-size: .83rem; color: var(--ink-soft); line-height: 1.55; }
.res-list li + li { border-top: 1px dashed var(--line-soft); }
.res-list b { font-family: var(--font-m); font-weight: 600; color: var(--accent); margin-right: .35rem; }
.res-list b sup { font-size: .65em; }
.fig-card.media { margin: 0 0 2rem; }
.fig-card.media img { width: 100%; height: auto; background: #fff; }
.gif-play { display: block; margin: .8rem 1.2rem 1rem; font-family: var(--font-m); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); background: none; border: 1px solid var(--accent-line); border-radius: 999px; padding: .5rem 1rem; cursor: pointer; }
.gif-play:hover { background: var(--accent-soft); }

/* surrogate versus operator */
.contrast { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; margin-bottom: 1.4rem; }
@media (max-width: 520px) { .contrast { grid-template-columns: 1fr; } }
.contrast > div { border: 1px solid var(--line); border-radius: 12px; padding: .85rem .9rem; background: var(--bg-raised); }
.contrast b { display: block; font-size: .85rem; font-weight: 600; }
.contrast span { display: block; margin-top: .3rem; font-family: var(--font-m); font-size: .7rem; color: var(--ink); line-height: 1.5; }
.contrast small { display: block; margin-top: .35rem; font-size: .72rem; color: var(--ink-soft); line-height: 1.45; }
.contrast .is-op { border-color: var(--accent-line); background: var(--accent-soft); }
.contrast .is-op b { color: var(--accent); }

/* foundation + textbooks */
.found-list { list-style: none; margin: 1.3rem 0 0; }
.found-list li { position: relative; padding: .75rem 0 .75rem 1.3rem; border-top: 1px solid var(--line-soft); font-size: .9rem; color: var(--ink-soft); line-height: 1.65; }
.found-list li:last-child { border-bottom: 1px solid var(--line-soft); }
.found-list li::before { content: "▸"; position: absolute; left: 0; color: var(--accent); }
.found-list b { color: var(--ink); font-weight: 600; }
.books-panel { border: 1px solid var(--line-soft); border-top: 3px solid var(--accent); border-radius: var(--r); background: var(--bg-raised); padding: 1.6rem 1.5rem 1.4rem; }
.books-count { font-size: 1rem; color: var(--ink); }
.books-count b { font-family: var(--font-m); font-size: 2.6rem; font-weight: 600; color: var(--accent); letter-spacing: -0.03em; margin-right: .5rem; vertical-align: -.1em; }
.books-sub { margin-top: .3rem; font-family: var(--font-m); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-soft); }
.books { margin: 1.3rem 0 1rem; display: grid; gap: .7rem; }
.book { display: block; text-decoration: none; color: inherit; border: 1px solid var(--line-soft); border-radius: 12px; padding: .9rem 1rem; background: var(--bg); transition: border-color .2s, transform .2s; }
.book:hover { border-color: var(--accent-line); transform: translateY(-2px); }
.book-pub { display: block; font-family: var(--font-m); font-size: .64rem; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
.book-title { display: block; margin-top: .4rem; font-weight: 600; font-size: .95rem; line-height: 1.35; letter-spacing: -0.01em; }
.book-auth { display: block; margin-top: .35rem; font-size: .78rem; color: var(--ink-soft); }
.book-auth strong { color: var(--ink); font-weight: 600; }
.t-link { font-family: var(--font-m); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); text-decoration: none; }
.t-link:hover { text-decoration: underline; }

/* research to product */
.product { margin-top: 1.6rem; border: 1px solid var(--line-soft); border-radius: var(--r); background: var(--bg-raised); padding: 1.3rem 1.4rem 1.2rem; }
.product .kp-label { margin-bottom: .6rem; }
.product-lead { font-weight: 500; font-size: .95rem; color: var(--ink); line-height: 1.6; }
.product ul { list-style: none; margin: .7rem 0 .9rem; }
.product li { position: relative; padding: .35rem 0 .35rem 1.2rem; font-size: .86rem; color: var(--ink-soft); line-height: 1.6; }
.product li::before { content: "▸"; position: absolute; left: 0; color: var(--accent); }
.product li strong { color: var(--ink); }

.arch-note { margin-top: 1rem; font-size: .84rem; color: var(--ink-soft); line-height: 1.7; max-width: 72ch; }
.build-card.is-base .b-num { color: var(--ink-soft); }

.pub-note { margin: -1.4rem 0 2rem; font-size: .8rem; color: var(--ink-soft); line-height: 1.6; }
.pub-note:empty { display: none; }

/* book covers */
.book { display: flex; gap: .9rem; align-items: flex-start; }
.book-cover { flex: none; width: 72px; height: auto; border-radius: 4px; box-shadow: 0 1px 2px rgba(23,23,28,.12), 0 6px 16px rgba(23,23,28,.14); background: #fff; }
.book-text { display: block; min-width: 0; }
.pub-item.has-cover { grid-template-columns: 3.2rem 1fr 84px; }
.pub-cover { display: block; align-self: start; }
.pub-cover img { width: 84px; height: auto; border-radius: 4px; box-shadow: 0 1px 2px rgba(23,23,28,.12), 0 6px 16px rgba(23,23,28,.14); background: #fff; }
@media (max-width: 560px) { .pub-item.has-cover { grid-template-columns: 2.4rem 1fr 64px; } .pub-cover img { width: 64px; } }

/* ---------- 19 · Beyond research ---------- */
.life-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; margin-bottom: 3rem; }
.life-card { background: var(--bg-raised); border: 1px solid var(--line); border-radius: var(--r); padding: 1.4rem 1.5rem; }
.life-wide { grid-column: 1 / -1; }
.life-tag { font-family: var(--font-m); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin-bottom: .4rem; }
.life-card h3 { font-size: 1.15rem; margin-bottom: .6rem; }
.life-card ul { list-style: none; display: grid; gap: .4rem; color: var(--ink-soft); font-size: .95rem; }
.life-card li { padding-left: 1.1rem; position: relative; }
.life-card li::before { content: "–"; position: absolute; left: 0; color: var(--ink-faint); }
.life-card strong { color: var(--ink); font-weight: 600; }
.shots-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .8rem; margin-bottom: 1.2rem; }
.shots-title { font-size: 1.1rem; }
.shots { columns: 3 260px; column-gap: 1rem; }
.shot { break-inside: avoid; margin: 0 0 1rem; }
.shot[hidden] { display: none; }
.shot-btn { display: block; width: 100%; padding: 0; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--bg-inset); cursor: zoom-in; }
.shot img { display: block; width: 100%; height: auto; transition: transform .4s ease; }
.shot-btn:hover img { transform: scale(1.03); }
.shot figcaption { font-size: .8rem; color: var(--ink-faint); margin-top: .35rem; }
.lightbox { border: 0; background: transparent; max-width: 96vw; max-height: 96vh; margin: auto; color: #fff; text-align: center; overflow: visible; }
.lightbox::backdrop { background: rgba(0,0,0,.82); }
.lightbox img { max-width: 94vw; max-height: 82vh; border-radius: 8px; display: block; margin: 0 auto; }
.lightbox p { margin-top: .6rem; font-size: .9rem; }
.lb-close { position: absolute; top: -2.2rem; right: 0; background: none; border: 0; color: #fff; font-size: 2rem; line-height: 1; cursor: pointer; }
@media (max-width: 720px) { .life-grid { grid-template-columns: 1fr; } .shots { columns: 2 140px; } }
@media (prefers-reduced-motion: reduce) { .shot img { transition: none; } .shot-btn:hover img { transform: none; } }