/* =========================================================
   Zilu Tang — Portfolio. Editorial-technical system.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;1,6..72,400;1,6..72,500&family=JetBrains+Mono:wght@400;500;600;700&family=Hanken+Grotesk:wght@400;500;600&display=swap');

:root {
  --bg:        #F4F1E9;
  --bg-2:      #ECE7DA;
  --card:      #EAE4D6;
  --ink:       #1B1A16;
  --ink-soft:  #6A665B;
  --ink-faint: #9A968B;
  --line:      rgba(27,26,22,0.14);
  --line-soft: rgba(27,26,22,0.08);
  --accent:    #F2C24B;   /* doodle yellow */
  --accent-ink:#1B1A16;
  --glass:     rgba(244,241,233,0.82);  /* frosted overlay tint */
  --serif: "Newsreader", Georgia, serif;
  --mono:  "JetBrains Mono", ui-monospace, monospace;
  --sans:  "Hanken Grotesk", system-ui, sans-serif;

  --maxw: 1240px;
  --pad: clamp(20px, 5vw, 64px);
  --radius: 26px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

a { color: inherit; text-decoration: none; }

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

/* ---------- Shared bits ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding-inline: var(--pad); }

.mono { font-family: var(--mono); }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.serif { font-family: var(--serif); }
.italic { font-style: italic; }

/* ---------- Pill button ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 13px 22px;
  border-radius: 100px;
  background: var(--ink);
  color: var(--bg);
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: transform .4s var(--ease), background .3s var(--ease), color .3s var(--ease);
  white-space: nowrap;
}
.pill:hover { transform: translateY(-2px); }
.pill .pill-arrow { transition: transform .4s var(--ease); display: inline-block; }
.pill:hover .pill-arrow { transform: translate(3px,-3px); }

.pill.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.pill.ghost:hover { border-color: var(--ink); background: var(--ink); color: var(--bg); }

/* =========================================================
   NAV
   ========================================================= */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px var(--pad);
  transition: background .4s var(--ease), border-color .4s var(--ease), backdrop-filter .4s;
  border-bottom: 1px solid transparent;
}
.topbar.scrolled {
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.brand .dot {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--accent);
  display: grid; place-items: center;
  font-family: var(--serif);
  font-style: italic;
  font-size: 17px;
  color: var(--ink);
  transition: transform .5s var(--ease);
}
.brand:hover .dot { transform: rotate(-12deg) scale(1.06); }

.nav-links {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-links a {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 8px 14px;
  border-radius: 100px;
  transition: color .25s, background .25s;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); background: rgba(27,26,22,0.06); }

.nav-right { display: flex; align-items: center; gap: 18px; }

.nav-toggle { display: none; }

/* =========================================================
   HERO
   ========================================================= */
.hero {
  padding-top: clamp(130px, 18vh, 200px);
  padding-bottom: clamp(60px, 9vh, 110px);
  position: relative;
}
.hero-status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  padding: 7px 14px;
  border-radius: 100px;
  margin-bottom: 34px;
}
.hero-status .blink {
  width: 7px; height: 7px; border-radius: 50%;
  background: #4FA76A;
  box-shadow: 0 0 0 0 rgba(79,167,106,.5);
  animation: blink 2.4s infinite;
}
@keyframes blink {
  0% { box-shadow: 0 0 0 0 rgba(79,167,106,.5); }
  70% { box-shadow: 0 0 0 8px rgba(79,167,106,0); }
  100% { box-shadow: 0 0 0 0 rgba(79,167,106,0); }
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(40px, 7.4vw, 104px);
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin: 0;
  max-width: 16ch;
  text-wrap: balance;
}
.hero h1 .roller {
  font-style: italic;
  position: relative;
  display: inline-block;
  color: var(--ink);
}
.hero h1 .roller::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0.07em;
  width: 100%; height: 0.10em;
  background: var(--accent);
  z-index: -1;
  transform: scaleX(1);
  transform-origin: left;
}

.hero-sub {
  margin-top: 36px;
  max-width: 52ch;
  font-size: clamp(16px, 1.4vw, 19px);
  color: var(--ink-soft);
  line-height: 1.65;
}
.hero-cta { margin-top: 40px; display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

/* doodle */
.doodle {
  position: absolute;
  pointer-events: none;
  z-index: 2;
}
.doodle--hero {
  top: clamp(110px, 15vh, 180px);
  right: clamp(20px, 8vw, 120px);
  width: clamp(86px, 11vw, 138px);
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%,100% { transform: translateY(0) rotate(-4deg); }
  50% { transform: translateY(-14px) rotate(4deg); }
}

.hero-meta {
  margin-top: clamp(56px, 8vh, 96px);
  display: flex;
  flex-wrap: wrap;
  gap: clamp(28px, 6vw, 80px);
  border-top: 1px solid var(--line);
  padding-top: 30px;
}
.hero-meta .col .k {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 10px;
}
.hero-meta .col .v {
  font-size: 15px;
  color: var(--ink);
  line-height: 1.7;
}
.hero-meta .col .v.serif { font-family: var(--serif); font-size: 19px; }

/* =========================================================
   SECTION HEADERS
   ========================================================= */
.section { padding-block: clamp(64px, 10vh, 130px); }
.section.alt { background: var(--bg-2); }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: clamp(36px, 5vh, 64px);
  flex-wrap: wrap;
}
.section-head h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(30px, 4.4vw, 60px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: 0;
  white-space: nowrap;
}
.section-head h2 .num {
  font-family: var(--mono);
  font-size: 0.34em;
  vertical-align: super;
  color: var(--ink-faint);
  margin-right: 0.6em;
  letter-spacing: 0;
}
.section-head .lead {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-soft);
  max-width: 30ch;
  line-height: 1.7;
}

/* =========================================================
   WORK / PORTFOLIO
   ========================================================= */
.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.filters button {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  padding: 8px 16px;
  border-radius: 100px;
  cursor: pointer;
  transition: all .3s var(--ease);
}
.filters button:hover { border-color: var(--ink); color: var(--ink); }
.filters button.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }

.work-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(20px, 2.4vw, 34px);
}
.work-card {
  grid-column: span 6;
  display: block;
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
.work-card.big { grid-column: span 12; }
.work-card.hidden {
  display: none;
}

.work-thumb {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
  aspect-ratio: 16 / 11;
  border: 1px solid var(--line-soft);
}
.work-card.big .work-thumb { aspect-ratio: 16 / 8.5; }
.work-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .8s var(--ease), filter .6s;
}
.work-card:hover .work-thumb img { transform: scale(1.045); }

.work-tag {
  position: absolute;
  top: 16px; left: 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--glass);
  backdrop-filter: blur(6px);
  color: var(--ink);
  padding: 6px 12px;
  border-radius: 100px;
}
.work-open {
  position: absolute;
  top: 14px; right: 14px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--bg);
  display: grid; place-items: center;
  font-size: 18px;
  transform: scale(0) rotate(-30deg);
  transition: transform .45s var(--ease);
}
.work-card:hover .work-open { transform: scale(1) rotate(0); }

.work-info {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 18px;
  padding: 18px 4px 0;
}
.work-info h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(20px, 2vw, 27px);
  line-height: 1.12;
  margin: 0;
  letter-spacing: -0.01em;
  transition: font-style .2s;
}
.work-card:hover .work-info h3 { font-style: italic; }
.work-info p {
  margin: 7px 0 0;
  color: var(--ink-soft);
  font-size: 14.5px;
  max-width: 46ch;
}
.work-yr {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  white-space: nowrap;
}

/* =========================================================
   ABOUT
   ========================================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: clamp(30px, 5vw, 72px);
  align-items: start;
}
.about-portrait {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
  position: relative;
  aspect-ratio: 4/5;
  border: 1px solid var(--line-soft);
}
.about-portrait img { width: 100%; height: 100%; object-fit: cover; }

.about-body h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.15;
  margin: 0 0 24px;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}
.about-body p.intro {
  font-size: 18px;
  color: var(--ink);
  line-height: 1.7;
  max-width: 60ch;
}
.about-facts {
  margin-top: 34px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 40px;
  border-top: 1px solid var(--line);
  padding-top: 26px;
}
.about-facts .fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}
.about-facts .fact .k {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.about-facts .fact .v { font-size: 15.5px; }

/* skills */
.skills-wrap { margin-top: 44px; }
.skill-group + .skill-group { margin-top: 30px; }
.skill-group h4 {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 16px;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.skill-tags .tag {
  font-family: var(--mono);
  font-size: 13px;
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 8px 15px;
  display: inline-flex;
  gap: 9px;
  align-items: center;
  transition: border-color .3s, transform .3s var(--ease);
}
.skill-tags .tag:hover { border-color: var(--ink); transform: translateY(-2px); }
.skill-tags .tag .lvl {
  font-size: 11px;
  color: var(--ink-faint);
}

/* =========================================================
   RESUME
   ========================================================= */
.resume-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(36px, 6vw, 80px);
}
.resume-col h3.rtitle {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.resume-col h3.rtitle + .resume-item { margin-top: 0; }
.r-block + .r-block { margin-top: 46px; }
.resume-item {
  position: relative;
  padding-left: 22px;
  margin-top: 30px;
}
.resume-item::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 8px; height: 8px;
  border-radius: 50%;
  border: 1.5px solid var(--ink);
}
.resume-item h4 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 20px;
  margin: 0 0 4px;
  line-height: 1.2;
}
.resume-item .when {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.resume-item .where { color: var(--ink-soft); font-style: italic; font-size: 14.5px; margin: 0 0 8px; }
.resume-item p { margin: 6px 0; font-size: 14.5px; color: var(--ink-soft); }
.resume-item ul { margin: 8px 0 0; padding-left: 18px; }
.resume-item li { font-size: 14px; color: var(--ink-soft); margin-bottom: 12px; line-height: 1.55; }
.resume-item a.inline {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
  display: inline-block;
  margin-top: 2px;
  transition: background .3s;
}
.resume-item a.inline:hover { background: var(--accent); }

/* =========================================================
   CONTACT / FOOTER
   ========================================================= */
.contact {
  background: var(--ink);
  color: var(--bg);
}
.contact .eyebrow { color: rgba(244,241,233,0.6); }
.contact .eyebrow::before { background: var(--accent); }
.contact h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(38px, 7vw, 92px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 22px 0 0;
  text-wrap: balance;
}
.contact h2 a { border-bottom: 2px solid var(--accent); transition: color .3s; }
.contact h2 a:hover { color: var(--accent); }
.contact-row {
  margin-top: clamp(48px, 8vh, 90px);
  display: flex;
  flex-wrap: wrap;
  gap: 30px 70px;
  border-top: 1px solid rgba(244,241,233,0.18);
  padding-top: 34px;
}
.contact-row .k {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(244,241,233,0.5);
  margin-bottom: 10px;
}
.contact-row .v { font-size: 15px; color: var(--bg); line-height: 1.7; }
.contact-row a.v:hover { color: var(--accent); }
.contact-socials { display: flex; gap: 10px; flex-wrap: wrap; }
.contact-socials a {
  font-family: var(--mono);
  font-size: 13px;
  border: 1px solid rgba(244,241,233,0.24);
  border-radius: 100px;
  padding: 9px 16px;
  transition: all .3s var(--ease);
}
.contact-socials a:hover { background: var(--accent); color: var(--ink); border-color: var(--accent); transform: translateY(-2px); }

.footer {
  background: var(--ink);
  color: rgba(244,241,233,0.5);
  padding: 30px var(--pad);
  border-top: 1px solid rgba(244,241,233,0.12);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 12px;
}

/* back to top */
.backtop {
  display: flex;
  justify-content: center;
  padding: clamp(40px, 7vh, 80px) var(--pad);
}
.backtop button {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 14px 26px;
  cursor: pointer;
  display: inline-flex;
  gap: 10px;
  align-items: center;
  transition: all .35s var(--ease);
}
.backtop button:hover { border-color: var(--ink); color: var(--ink); gap: 14px; }
.backtop button .up { transition: transform .35s var(--ease); }
.backtop button:hover .up { transform: translateY(-3px); }

/* =========================================================
   REVEAL ANIM
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.in { opacity: 1; transform: none; }

/* =========================================================
   DETAIL PAGE
   ========================================================= */
.detail-hero {
  padding-top: clamp(110px, 14vh, 150px);
}
.detail-figure {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line-soft);
  position: relative;
  aspect-ratio: 16/8.5;
}
.detail-figure img { width: 100%; height: 100%; object-fit: cover; }

.detail-title-row {
  margin-top: clamp(40px, 6vh, 72px);
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: clamp(30px, 5vw, 70px);
  align-items: start;
}
.detail-title-row h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(40px, 6.5vw, 92px);
  line-height: 1.0;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}
.detail-title-row h1 em { font-style: italic; }
.detail-lede {
  font-size: clamp(17px, 1.5vw, 21px);
  color: var(--ink-soft);
  margin-top: 22px;
  max-width: 46ch;
  line-height: 1.6;
}

.detail-meta { padding-top: 6px; }
.detail-meta .block + .block { margin-top: 28px; }
.detail-meta .k {
  font-family: var(--serif);
  font-size: 19px;
  margin-bottom: 12px;
}
.detail-meta ul { list-style: none; margin: 0; padding: 0; }
.detail-meta li {
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--ink-soft);
  padding: 5px 0;
  line-height: 1.5;
}
.detail-meta li strong { color: var(--ink); font-weight: 600; }

.detail-divider { border: none; border-top: 1px solid var(--line); margin: clamp(44px,7vh,80px) 0; }

.detail-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(30px, 5vw, 70px);
  max-width: 1000px;
}
.detail-body p {
  margin: 0 0 20px;
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--ink);
}

.detail-gallery {
  margin-top: clamp(44px, 7vh, 90px);
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 40px);
}
.detail-gallery figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line-soft);
}
.detail-gallery img { width: 100%; height: auto; }

.detail-next {
  border-top: 1px solid var(--line);
  margin-top: clamp(44px,7vh,90px);
  padding-top: 34px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.detail-next .k { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); letter-spacing: 0.12em; text-transform: uppercase; }
.detail-next a {
  font-family: var(--serif);
  font-size: clamp(22px, 3vw, 36px);
  display: inline-flex;
  align-items: center;
  gap: 14px;
}
.detail-next a:hover { font-style: italic; }

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-toggle {
    display: inline-flex;
    font-family: var(--mono);
    font-size: 13px;
    border: 1px solid var(--line);
    background: transparent;
    border-radius: 100px;
    padding: 9px 16px;
    cursor: pointer;
  }
  .work-card, .work-card.big { grid-column: span 12; }
  .about-grid { grid-template-columns: 1fr; }
  .about-portrait { max-width: 380px; }
  .resume-grid { grid-template-columns: 1fr; }
  .detail-title-row { grid-template-columns: 1fr; }
  .detail-body { grid-template-columns: 1fr; }
  .about-facts { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero-meta { gap: 22px; }
  .skill-tags .tag { font-size: 12px; }
}

/* mobile menu sheet */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--bg);
  display: none;
  flex-direction: column;
  padding: 24px var(--pad);
  transform: translateY(-100%);
  visibility: hidden;
  transition: transform .5s var(--ease), visibility .5s;
}
.mobile-menu.open { transform: none; visibility: visible; }
@media (max-width: 900px) {
  .mobile-menu { display: flex; }
}
.mobile-menu .mm-top { display: flex; justify-content: space-between; align-items: center; }
.mobile-menu nav { margin-top: 40px; display: flex; flex-direction: column; gap: 6px; }
.mobile-menu nav a {
  font-family: var(--serif);
  font-size: 11vw;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
}
.mobile-menu nav a:hover { font-style: italic; }

/* =========================================================
   RICH DETAIL SECTIONS (multi-section projects + PI&V)
   ========================================================= */
.detail-sections { margin-top: clamp(44px, 7vh, 90px); }
.detail-section { margin-top: clamp(48px, 8vh, 96px); }
.detail-section:first-child { margin-top: 0; }
.detail-section > h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 0 0 24px;
  max-width: 22ch;
}
.detail-section > h2 .num {
  font-family: var(--mono);
  font-size: 0.32em;
  vertical-align: super;
  color: var(--ink-faint);
  margin-right: 0.7em;
  letter-spacing: 0;
}
.detail-section h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(20px, 2.4vw, 27px);
  margin: 34px 0 14px;
  letter-spacing: -0.01em;
}
.detail-section h4 {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 28px 0 14px;
}
.detail-section p {
  font-size: 16.5px;
  line-height: 1.72;
  color: var(--ink);
  max-width: 68ch;
  margin: 0 0 18px;
}
.detail-section p.muted { color: var(--ink-soft); font-size: 13.5px; line-height: 1.6; font-family: var(--mono); }
.detail-section ul {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  max-width: 68ch;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.detail-section li {
  position: relative;
  padding-left: 22px;
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.detail-section li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.detail-section .meta-inline {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  margin: 0 0 18px;
}
.detail-section .meta-inline strong { color: var(--ink); font-weight: 600; }

.fig {
  margin: 0 0 8px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line-soft);
}
.fig img { width: 100%; height: auto; display: block; }
.fig.narrow { max-width: 560px; margin-left: auto; margin-right: auto; }
.fig.mid { max-width: 760px; margin-left: auto; margin-right: auto; }
.fig.narrow + .cap, .fig.mid + .cap { text-align: center; }
figure.fig + figcaption, .cap {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  margin: 0 0 24px;
  letter-spacing: 0.02em;
}
.fig-stack { display: flex; flex-direction: column; gap: clamp(16px, 2.4vw, 32px); margin-top: 8px; }

.detail-section video {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: #000;
  display: block;
}

/* PI&V reading layout */
.piv-body { max-width: 760px; }
.piv-body .detail-section > h2 { font-size: clamp(26px, 3.4vw, 40px); }
.piv-body p { font-size: 17.5px; line-height: 1.78; max-width: none; }

/* =========================================================
   ACCENT THEME OVERRIDE + SWITCHER (review tool)
   ========================================================= */
html[data-accent="blue"] {
  --bg:        #EBF1F9;
  --bg-2:      #DEE8F4;
  --card:      #DBE6F3;
  --ink:       #16202C;
  --ink-soft:  #54657A;
  --ink-faint: #8A99AC;
  --line:      rgba(22,32,44,0.14);
  --line-soft: rgba(22,32,44,0.08);
  --accent:    #4F93D9;
  --glass:     rgba(235,241,249,0.82);
}

/* language toggle (top-right) */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 4px;
  background: transparent;
  cursor: pointer;
}
.lang-switch .opt {
  padding: 7px 13px;
  border-radius: 100px;
  color: var(--ink-soft);
  transition: color .25s, background .3s var(--ease);
  line-height: 1;
}
.lang-switch .opt.on { background: var(--ink); color: var(--bg); }
.lang-switch:hover { border-color: var(--ink); }

/* Chinese view — bold the small subheadings / labels for legibility */
html[lang="zh"] .eyebrow,
html[lang="zh"] .k,
html[lang="zh"] .rtitle,
html[lang="zh"] .skill-group h4,
html[lang="zh"] .resume-item h4,
html[lang="zh"] .detail-meta .k,
html[lang="zh"] .detail-next .k,
html[lang="zh"] .detail-section h3,
html[lang="zh"] .detail-section h4 {
  font-weight: 700;
}