/* ============================================================
   Jin Pengfei · Personal Portfolio — Design System
   Concept: Athletic Academia (deep navy + warm coral)
   ============================================================ */

/* ----- Design Tokens ----- */
:root {
  /* Brand */
  --c-ink-900: #0B1B2B;
  --c-ink-800: #14283F;
  --c-ink-700: #1F3A5F;
  --c-ink-500: #4A5C73;
  --c-ink-400: #6B7B92;
  --c-ink-300: #9CA8BA;
  --c-ink-200: #D5DCE5;
  --c-ink-100: #E9EDF2;
  --c-ink-50:  #F5F7FA;
  --c-paper:   #FAFBFC;

  /* Accent — table tennis red / coral */
  --c-coral-700: #B5232D;
  --c-coral-600: #D62B33;
  --c-coral-500: #E63946;
  --c-coral-100: #FBE6E8;

  /* Highlight — gold for academic */
  --c-gold-500: #C9A85A;
  --c-gold-100: #F4ECDA;

  /* Functional */
  --c-success: #1F8A5A;
  --c-info:    #2F6FB5;
  --c-warning: #C97A1A;

  /* Type scale */
  --font-sans: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --font-serif: 'Source Serif 4', 'Source Han Serif SC', 'Noto Serif CJK SC', 'Songti SC', 'STSong', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --fs-display: clamp(2.6rem, 5vw + 1rem, 4.6rem);
  --fs-h1: clamp(2rem, 3vw + 1rem, 3rem);
  --fs-h2: clamp(1.5rem, 1.6vw + 1rem, 2.1rem);
  --fs-h3: 1.35rem;
  --fs-lead: 1.125rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --fs-eyebrow: 0.78rem;

  /* Spacing (8pt base) */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;
  --s-10: 128px;

  /* Radius */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-pill: 999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(11,27,43,0.06), 0 1px 1px rgba(11,27,43,0.04);
  --shadow-md: 0 6px 18px -8px rgba(11,27,43,0.18), 0 2px 6px rgba(11,27,43,0.06);
  --shadow-lg: 0 24px 50px -20px rgba(11,27,43,0.28), 0 8px 16px -8px rgba(11,27,43,0.10);
  --shadow-coral: 0 14px 30px -14px rgba(230,57,70,0.55);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
  --t-fast: 150ms;
  --t-med: 280ms;
  --t-slow: 520ms;

  /* Layout */
  --container-max: 1180px;
  --logo-strip-height: 88px;
}

/* ----- Reset ----- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--c-ink-800);
  background: var(--c-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
ul, ol { padding-left: 1.4em; margin: 0; }

/* ----- Utility: container ----- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--s-5);
}

/* ============================================================
   1. School Logos Strip (top of every page)
   ============================================================ */
.logo-strip {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250,251,252,0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--c-ink-100);
}
.logo-strip__inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-4);
  align-items: center;
  height: var(--logo-strip-height);
  padding: var(--s-3) 0;
}
.logo-strip__item {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: var(--s-2);
  border-radius: var(--r-md);
  transition: transform var(--t-med) var(--ease-out), background var(--t-fast) var(--ease-soft);
}
.logo-strip__item:hover {
  transform: translateY(-2px);
  background: var(--c-ink-50);
}
.logo-strip__item img {
  max-height: 64px;
  max-width: 100%;
  width: auto;
  object-fit: contain;
  filter: saturate(1.05);
}

/* ============================================================
   2. Top Navigation
   ============================================================ */
.nav {
  border-bottom: 1px solid var(--c-ink-100);
  background: var(--c-paper);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: var(--s-5);
}
.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--c-ink-900);
  letter-spacing: 0.01em;
}
.nav__brand .brand-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--c-coral-500);
  box-shadow: 0 0 0 4px var(--c-coral-100);
}
.nav__brand small {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--c-ink-400);
  text-transform: uppercase;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-2) var(--s-4);
  border-radius: var(--r-pill);
  color: var(--c-ink-700);
  font-weight: 500;
  font-size: 0.94rem;
  transition: all var(--t-fast) var(--ease-soft);
}
.nav__link:hover {
  background: var(--c-ink-50);
  color: var(--c-ink-900);
}
.nav__link.is-active {
  background: var(--c-ink-900);
  color: #fff;
}
.nav__link .nav__lang {
  font-family: var(--font-serif);
  font-size: 0.82rem;
  opacity: 0.7;
  font-weight: 400;
}
.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-2) var(--s-4);
  border-radius: var(--r-pill);
  background: var(--c-coral-500);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: var(--shadow-coral);
  transition: transform var(--t-fast) var(--ease-out), background var(--t-fast) var(--ease-soft);
}
.nav__cta:hover { background: var(--c-coral-600); transform: translateY(-1px); }

/* ============================================================
   3. Hero
   ============================================================ */
.hero {
  position: relative;
  padding: var(--s-9) 0 var(--s-8);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 500px at 88% -10%, rgba(230,57,70,0.10), transparent 60%),
    radial-gradient(800px 600px at -10% 110%, rgba(47,111,181,0.10), transparent 60%);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--s-8);
  align-items: center;
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 6px 14px;
  border: 1px solid var(--c-ink-200);
  border-radius: var(--r-pill);
  background: rgba(255,255,255,0.6);
  font-size: var(--fs-eyebrow);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-ink-500);
  margin-bottom: var(--s-5);
}
.hero__eyebrow::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--c-coral-500);
  box-shadow: 0 0 0 4px var(--c-coral-100);
}
.hero__title {
  font-family: var(--font-serif);
  font-size: var(--fs-display);
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--c-ink-900);
  margin: 0 0 var(--s-3);
}
.hero__title .accent {
  color: var(--c-coral-500);
  font-style: italic;
  position: relative;
}
.hero__title .accent::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0.06em;
  height: 8px;
  background: var(--c-coral-100);
  z-index: -1;
  border-radius: 2px;
}
.hero__subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 1.4vw + 0.8rem, 2.1rem);
  font-weight: 500;
  color: var(--c-ink-700);
  margin: 0 0 var(--s-5);
}
.hero__lede {
  font-size: var(--fs-lead);
  color: var(--c-ink-500);
  max-width: 60ch;
  margin: 0 0 var(--s-6);
}
.hero__lede.zh {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.9;
  color: var(--c-ink-700);
}
.hero__cta-row {
  display: flex;
  gap: var(--s-3);
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 14px 22px;
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: all var(--t-fast) var(--ease-out);
  white-space: nowrap;
}
.btn--primary {
  background: var(--c-ink-900);
  color: #fff;
}
.btn--primary:hover { background: var(--c-ink-800); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn--coral {
  background: var(--c-coral-500);
  color: #fff;
  box-shadow: var(--shadow-coral);
}
.btn--coral:hover { background: var(--c-coral-600); transform: translateY(-1px); }
.btn--ghost {
  background: transparent;
  color: var(--c-ink-800);
  border-color: var(--c-ink-200);
}
.btn--ghost:hover { background: var(--c-ink-50); border-color: var(--c-ink-300); }
.btn .arrow { transition: transform var(--t-fast) var(--ease-out); }
.btn:hover .arrow { transform: translateX(3px); }

/* Hero right: portrait + mini cards */
.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
.portrait-card {
  position: relative;
  width: 360px;
  max-width: 100%;
  aspect-ratio: 3/4;
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--c-ink-100);
}
.portrait-card img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--t-slow) var(--ease-out);
}
.portrait-card:hover img { transform: scale(1.04); }
.portrait-card::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(11,27,43,0.55) 100%);
  pointer-events: none;
}
.portrait-card__tag {
  position: absolute;
  left: var(--s-4); bottom: var(--s-4);
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 8px 14px;
  border-radius: var(--r-pill);
  background: rgba(255,255,255,0.92);
  color: var(--c-ink-900);
  font-weight: 600;
  font-size: 0.85rem;
  backdrop-filter: blur(8px);
}
.portrait-card__tag .ping {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--c-coral-500);
}
.float-stat {
  position: absolute;
  background: #fff;
  border: 1px solid var(--c-ink-100);
  border-radius: var(--r-lg);
  padding: 12px 16px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: var(--s-3);
  min-width: 168px;
}
.float-stat__icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: grid; place-items: center;
  background: var(--c-coral-100);
  color: var(--c-coral-600);
  font-size: 18px;
}
.float-stat--tl { top: 6%; left: -8%; }
.float-stat--br { bottom: 8%; right: -6%; }
.float-stat__num {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-ink-900);
  line-height: 1.1;
}
.float-stat__lbl {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-ink-400);
}

/* ============================================================
   4. Section base
   ============================================================ */
.section { padding: var(--s-9) 0; }
.section--tight { padding: var(--s-7) 0; }
.section--paper { background: var(--c-paper); }
.section--ink   { background: var(--c-ink-900); color: #fff; }
.section--ink .eyebrow { color: var(--c-coral-500); }

.eyebrow {
  display: inline-block;
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-coral-600);
  font-weight: 600;
  margin-bottom: var(--s-3);
}
.section__title {
  font-family: var(--font-serif);
  font-size: var(--fs-h1);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin: 0 0 var(--s-3);
  color: inherit;
}
.section__lede {
  max-width: 64ch;
  color: var(--c-ink-500);
  font-size: 1.05rem;
  margin: 0 0 var(--s-7);
}
.section--ink .section__lede { color: var(--c-ink-300); }

/* ============================================================
   5. Quick-entry cards (home page)
   ============================================================ */
.entry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}
.entry-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 280px;
  padding: var(--s-6);
  border-radius: var(--r-xl);
  background: #fff;
  border: 1px solid var(--c-ink-100);
  overflow: hidden;
  transition: transform var(--t-med) var(--ease-out), box-shadow var(--t-med) var(--ease-out), border-color var(--t-fast) var(--ease-soft);
}
.entry-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(230,57,70,0.06));
  pointer-events: none;
}
.entry-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-ink-200);
}
.entry-card__icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: grid; place-items: center;
  background: var(--c-ink-900);
  color: #fff;
  font-size: 22px;
  margin-bottom: var(--s-5);
}
.entry-card--coral .entry-card__icon { background: var(--c-coral-500); box-shadow: var(--shadow-coral); }
.entry-card--gold  .entry-card__icon { background: var(--c-gold-500); }
.entry-card__title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 var(--s-2);
  color: var(--c-ink-900);
}
.entry-card__title .zh { display: block; font-size: 1.05rem; color: var(--c-ink-500); margin-top: 2px; }
.entry-card__desc { color: var(--c-ink-500); font-size: 0.95rem; margin: 0 0 var(--s-5); }
.entry-card__more {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-weight: 600;
  color: var(--c-coral-600);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: auto;
}
.entry-card__more .arrow { transition: transform var(--t-fast) var(--ease-out); }
.entry-card:hover .entry-card__more .arrow { transform: translateX(4px); }

/* ============================================================
   6. Highlights band (numbers)
   ============================================================ */
.stats-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-5);
  padding: var(--s-6);
  background: #fff;
  border: 1px solid var(--c-ink-100);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-sm);
}
.stat__num {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 600;
  color: var(--c-ink-900);
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.stat__num small { font-size: 1rem; color: var(--c-coral-500); font-weight: 500; }
.stat__lbl { color: var(--c-ink-500); font-size: 0.85rem; margin-top: 4px; }
.stat__lbl .zh { display: block; color: var(--c-ink-400); font-size: 0.78rem; }

/* ============================================================
   7. About page — bio
   ============================================================ */
.bio-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--s-7);
  align-items: start;
}
.bio-card {
  background: #fff;
  border: 1px solid var(--c-ink-100);
  border-radius: var(--r-xl);
  padding: var(--s-5);
  position: sticky;
  top: calc(var(--logo-strip-height) + 24px);
  box-shadow: var(--shadow-sm);
}
.bio-portrait {
  width: 100%;
  aspect-ratio: 3/4;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--c-ink-100);
  margin-bottom: var(--s-4);
}
.bio-portrait--sm {
  max-width: 200px;
  margin-left: auto;
  margin-right: auto;
  aspect-ratio: 3/4;
}
.bio-portrait img { width: 100%; height: 100%; object-fit: cover; }
.bio-name { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 600; color: var(--c-ink-900); margin: 0 0 4px; }
.bio-name-zh { font-size: 1.1rem; color: var(--c-ink-500); margin: 0 0 var(--s-3); }
.bio-role { font-size: 0.92rem; color: var(--c-ink-700); margin: 0 0 var(--s-3); }
.bio-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: var(--s-3) 0 var(--s-4); }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 500;
  border-radius: var(--r-pill);
  background: var(--c-ink-50);
  color: var(--c-ink-700);
  border: 1px solid var(--c-ink-100);
}
.chip--coral { background: var(--c-coral-100); color: var(--c-coral-700); border-color: rgba(230,57,70,0.15); }
.chip--gold  { background: var(--c-gold-100); color: #876a16; border-color: rgba(201,168,90,0.25); }
.bio-meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: var(--s-3);
  padding-top: var(--s-3);
  border-top: 1px dashed var(--c-ink-200);
}
.bio-meta__row {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: 0.88rem;
  color: var(--c-ink-500);
}
.bio-meta__row strong { color: var(--c-ink-900); font-weight: 600; }

/* Bilingual block */
.bilingual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-5);
}
.lang-block {
  padding: var(--s-5);
  background: #fff;
  border: 1px solid var(--c-ink-100);
  border-radius: var(--r-lg);
}
.lang-block--en { background: linear-gradient(180deg, #fff, #F8FAFC); }
.lang-block--zh { background: linear-gradient(180deg, #fff, #FCF8F2); }
.lang-block__label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-coral-600);
  margin-bottom: var(--s-3);
}
.lang-block--zh .lang-block__label { color: var(--c-gold-500); }
.lang-block h3 { font-family: var(--font-serif); font-size: 1.15rem; margin: 0 0 var(--s-2); color: var(--c-ink-900); }
.lang-block p  { margin: 0 0 var(--s-3); color: var(--c-ink-700); line-height: 1.75; }
.lang-block ul { margin: 0; padding-left: 1.1em; color: var(--c-ink-700); }
.lang-block li { margin-bottom: 6px; line-height: 1.7; }

/* ============================================================
   8. Timeline
   ============================================================ */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 8px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-coral-500), var(--c-ink-200));
}
.tl-item { position: relative; padding-bottom: var(--s-5); }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -26px; top: 6px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--c-coral-500);
  box-shadow: 0 0 0 4px var(--c-coral-100);
}
.tl-date {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--c-coral-600);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tl-title { font-family: var(--font-serif); font-size: 1.15rem; font-weight: 600; color: var(--c-ink-900); margin: 2px 0 4px; }
.tl-title .zh { color: var(--c-ink-500); font-size: 1rem; margin-left: 8px; font-weight: 500; }
.tl-meta { color: var(--c-ink-500); font-size: 0.88rem; margin-bottom: 4px; }
.tl-desc { color: var(--c-ink-700); font-size: 0.95rem; }

/* ============================================================
   9. Publications
   ============================================================ */
.pub-list { display: flex; flex-direction: column; gap: var(--s-3); }
.pub {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  gap: var(--s-4);
  padding: var(--s-4) var(--s-5);
  background: #fff;
  border: 1px solid var(--c-ink-100);
  border-radius: var(--r-lg);
  transition: border-color var(--t-fast) var(--ease-soft), transform var(--t-fast) var(--ease-out);
}
.pub:hover { border-color: var(--c-coral-500); transform: translateX(2px); }
.pub__num {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-coral-500);
  line-height: 1;
}
.pub__title { font-weight: 600; color: var(--c-ink-900); margin: 0 0 4px; }
.pub__meta { color: var(--c-ink-500); font-size: 0.88rem; }
.pub__meta em { color: var(--c-ink-800); font-style: normal; font-weight: 500; }
.pub__if {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 10px;
  border-radius: var(--r-pill);
  background: var(--c-gold-100);
  color: #876a16;
  font-size: 0.74rem;
  font-weight: 600;
  white-space: nowrap;
  align-self: start;
}

/* ============================================================
   10. Awards grid
   ============================================================ */
.award-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-4);
}
.award {
  padding: var(--s-5);
  background: #fff;
  border: 1px solid var(--c-ink-100);
  border-radius: var(--r-lg);
  transition: transform var(--t-med) var(--ease-out), box-shadow var(--t-med) var(--ease-out);
}
.award:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.award__icon {
  width: 38px; height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, #F4ECDA, #E8D3A4);
  color: #876a16;
  display: grid; place-items: center;
  font-size: 18px;
  margin-bottom: var(--s-3);
}
.award__title { font-family: var(--font-serif); font-size: 1.02rem; font-weight: 600; color: var(--c-ink-900); margin: 0 0 4px; }
.award__meta { font-size: 0.84rem; color: var(--c-ink-500); }
.award__meta .zh { display: block; color: var(--c-ink-400); margin-top: 2px; }

/* ============================================================
   11. Video showcase
   ============================================================ */
.media-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-5);
}
.media-card {
  background: #fff;
  border: 1px solid var(--c-ink-100);
  border-radius: var(--r-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--t-med) var(--ease-out), box-shadow var(--t-med) var(--ease-out);
}
.media-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.media-card__frame {
  position: relative;
  aspect-ratio: 16/9;
  background: #000;
  overflow: hidden;
}
.media-card__frame video {
  width: 100%; height: 100%; object-fit: cover; display: block;
}
.media-card__body { padding: var(--s-5); }
.media-card__cat {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-coral-600);
  margin-bottom: var(--s-2);
}
.media-card__title { font-family: var(--font-serif); font-size: 1.25rem; font-weight: 600; color: var(--c-ink-900); margin: 0 0 var(--s-2); }
.media-card__desc { color: var(--c-ink-500); font-size: 0.95rem; line-height: 1.7; margin: 0 0 var(--s-3); }

/* Certificate */
.cert-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--s-6);
  background: #fff;
  border: 1px solid var(--c-ink-100);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.cert-card__media {
  background: #0E1A26;
  display: grid; place-items: center;
  padding: var(--s-5);
}
.cert-card__media img { width: 100%; height: auto; border-radius: var(--r-md); box-shadow: var(--shadow-md); }
.cert-card__body { padding: var(--s-6); display: flex; flex-direction: column; justify-content: center; }
.cert-card__vendor {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  color: #76B900;
  margin-bottom: var(--s-3);
}
.cert-card__vendor::before {
  content: ""; width: 10px; height: 10px; background: #76B900; border-radius: 2px;
  box-shadow: 0 0 12px #76B900;
}
.cert-card__title { font-family: var(--font-serif); font-size: 1.6rem; font-weight: 600; color: var(--c-ink-900); margin: 0 0 var(--s-2); }
.cert-card__title .zh { display: block; font-size: 1.1rem; color: var(--c-ink-500); margin-top: 4px; }
.cert-card__desc { color: var(--c-ink-500); margin: 0 0 var(--s-4); }
.cert-card__meta { display: flex; flex-wrap: wrap; gap: var(--s-3); font-size: 0.85rem; color: var(--c-ink-500); }
.cert-card__meta strong { color: var(--c-ink-900); }

/* ============================================================
   12. Life-photo grid
   ============================================================ */
.life-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-3);
}
.life-slot {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--c-ink-50);
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--t-med) var(--ease-out);
}
.life-slot::before { content: none; }
.life-slot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.life-slot:hover {
  transform: translateY(-2px) scale(1.01);
  box-shadow: var(--shadow-md);
}
.life-slot--tall { grid-row: auto; }
.life-slot--wide { grid-column: auto; }
.life-slot__label { display: none; }

/* ============================================================
   13. Footer
   ============================================================ */
.footer {
  background: var(--c-ink-900);
  color: var(--c-ink-200);
  padding: var(--s-8) 0 var(--s-5);
  margin-top: var(--s-8);
}
.footer__top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--s-7);
  padding-bottom: var(--s-6);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer h4 {
  font-family: var(--font-serif);
  color: #fff;
  font-size: 0.95rem;
  margin: 0 0 var(--s-3);
  letter-spacing: 0.04em;
}
.footer p, .footer a { color: var(--c-ink-300); font-size: 0.9rem; }
.footer__links { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.footer__links a:hover { color: var(--c-coral-500); }
.footer__brand { font-family: var(--font-serif); font-size: 1.4rem; color: #fff; font-weight: 600; }
.footer__brand .accent { color: var(--c-coral-500); font-style: italic; }
.footer__bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: var(--s-4);
  font-size: 0.82rem;
  color: var(--c-ink-400);
  flex-wrap: wrap;
  gap: var(--s-3);
}
.footer__bottom .socials { display: flex; gap: 12px; }
.footer__bottom .socials a {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  display: grid; place-items: center;
  transition: all var(--t-fast) var(--ease-soft);
}
.footer__bottom .socials a:hover { background: var(--c-coral-500); color: #fff; transform: translateY(-2px); }

/* ============================================================
   22. Visitor stats bar (Busuanzi + tracker)
   ============================================================ */
.visitor-stats {
  border-top: 1px solid rgba(255,255,255,0.06);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: var(--s-3) 0;
  margin: var(--s-4) 0;
}
.visitor-stats__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--s-2);
}
.visitor-stat {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  background: rgba(255,255,255,0.04);
  transition: background var(--t-fast) var(--ease-soft);
}
.visitor-stat:hover {
  background: rgba(255,255,255,0.08);
}
.visitor-stat__num {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-gold-500);
  font-variant-numeric: tabular-nums;
  min-width: 24px;
  text-align: center;
}
.visitor-stat__lbl {
  font-size: 0.7rem;
  color: var(--c-ink-400);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.visitor-stats__sep {
  color: var(--c-ink-400);
  font-size: 0.7rem;
  opacity: 0.4;
}

/* ============================================================
   14. Contact page
   ============================================================ */
.contact-hero {
  text-align: center;
  padding: var(--s-9) 0 var(--s-6);
}
.contact-hero h1 {
  font-family: var(--font-serif);
  font-size: var(--fs-display);
  font-weight: 600;
  margin: 0 0 var(--s-3);
  color: var(--c-ink-900);
}
.contact-hero p { color: var(--c-ink-500); font-size: 1.1rem; max-width: 56ch; margin: 0 auto; }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-5);
  margin: var(--s-7) 0;
}
.contact-card {
  background: #fff;
  border: 1px solid var(--c-ink-100);
  border-radius: var(--r-xl);
  padding: var(--s-6);
  display: flex;
  gap: var(--s-4);
  align-items: flex-start;
  transition: transform var(--t-med) var(--ease-out), box-shadow var(--t-med) var(--ease-out);
}
.contact-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.contact-card__icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: grid; place-items: center;
  background: var(--c-ink-900);
  color: #fff;
  font-size: 22px;
  flex-shrink: 0;
}
.contact-card--coral .contact-card__icon { background: var(--c-coral-500); }
.contact-card__label { font-size: 0.78rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--c-ink-400); margin: 0 0 4px; }
.contact-card__value { font-family: var(--font-serif); font-size: 1.25rem; font-weight: 600; color: var(--c-ink-900); margin: 0; word-break: break-word; }
.contact-card__note { font-size: 0.86rem; color: var(--c-ink-500); margin-top: 6px; }

/* ============================================================
   15. Blog placeholder
   ============================================================ */
.blog-empty {
  text-align: center;
  padding: var(--s-9) var(--s-5);
  background: #fff;
  border: 1px dashed var(--c-ink-200);
  border-radius: var(--r-xl);
  margin: var(--s-6) 0;
}
.blog-empty__icon {
  width: 80px; height: 80px;
  margin: 0 auto var(--s-4);
  border-radius: 24px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--c-coral-500), var(--c-coral-700));
  color: #fff;
  font-size: 36px;
  box-shadow: var(--shadow-coral);
}
.blog-empty h2 { font-family: var(--font-serif); font-size: 1.8rem; margin: 0 0 var(--s-3); color: var(--c-ink-900); }
.blog-empty p { color: var(--c-ink-500); max-width: 50ch; margin: 0 auto var(--s-4); }
.blog-empty .tag-row { display: inline-flex; flex-wrap: wrap; gap: 8px; justify-content: center; }

/* ============================================================
   16. Reveal-on-scroll animation
   ============================================================ */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out); }
.reveal.is-visible { opacity: 1; transform: none; }

/* ============================================================
   17. Responsive
   ============================================================ */
@media (max-width: 980px) {
  :root { --logo-strip-height: 76px; }
  .logo-strip__item img { max-height: 48px; }
  .hero__inner, .bio-grid, .cert-card, .media-grid, .bilingual, .contact-grid {
    grid-template-columns: 1fr;
  }
  .entry-grid, .award-grid, .life-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-band { grid-template-columns: repeat(2, 1fr); }
  .footer__top { grid-template-columns: 1fr; }
  .nav__links { display: none; }
  .float-stat--tl { left: 4%; }
  .float-stat--br { right: 4%; }
  .bio-card { position: static; }
  .life-slot--wide { grid-column: auto; }
}
@media (max-width: 640px) {
  .hero { padding: var(--s-7) 0 var(--s-6); }
  .section { padding: var(--s-7) 0; }
  .entry-grid, .award-grid { grid-template-columns: 1fr; }
  .life-grid { grid-template-columns: repeat(2, 1fr); }
  .life-slot--tall, .life-slot--wide { grid-row: auto; grid-column: auto; }
  .pub { grid-template-columns: 24px 1fr; }
  .pub__if { grid-column: 2; }
  .portrait-card { width: 280px; }
  .float-stat { min-width: 140px; padding: 10px 12px; }
  .float-stat__num { font-size: 1.05rem; }
  .logo-strip__item img { max-height: 40px; }
}

/* ============================================================
   18. Print / accessibility
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}
:focus-visible {
  outline: 2px solid var(--c-coral-500);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============================================================
   19. Floating sub-navigation (about page)
   ============================================================ */
.subnav {
  position: sticky;
  top: var(--logo-strip-height);
  z-index: 40;
  background: rgba(250, 251, 252, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-ink-100);
}
.subnav__inner {
  display: flex;
  align-items: center;
  gap: var(--s-1);
  padding: var(--s-2) 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.subnav__inner::-webkit-scrollbar { display: none; }
.subnav__inner a {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--r-pill);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--c-ink-500);
  white-space: nowrap;
  border: 1px solid transparent;
  transition: all var(--t-fast) var(--ease-soft);
}
.subnav__inner a:hover {
  background: var(--c-ink-50);
  color: var(--c-ink-900);
  border-color: var(--c-ink-100);
}
.subnav__inner a.is-active {
  background: var(--c-ink-900);
  color: #fff;
  border-color: var(--c-ink-900);
}
.subnav__inner a .subnav__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  opacity: 0.55;
  font-weight: 600;
}

/* ============================================================
   20. Publication callout (Nature Medicine VR work)
   ============================================================ */
.pub-callout {
  margin-top: var(--s-3);
  padding: var(--s-3) var(--s-4);
  background: rgba(255, 255, 255, 0.06);
  border-left: 3px solid var(--c-coral-500);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--c-ink-200);
}
.section:not(.section--ink) .pub-callout {
  background: #FFF8F2;
  border-left-color: var(--c-coral-500);
  color: var(--c-ink-700);
}
.section--ink .pub-callout strong { color: var(--c-coral-500); }
.section:not(.section--ink) .pub-callout strong { color: var(--c-coral-700); }
.pub-callout .pub-callout__zh {
  display: block;
  margin-top: 6px;
  font-family: var(--font-serif);
  color: var(--c-ink-400);
  font-size: 0.86rem;
}
.section--ink .pub-callout .pub-callout__zh { color: var(--c-ink-300); }
.pub--coauthor { opacity: 0.95; }
.pub--coauthor .pub__if {
  background: rgba(255, 255, 255, 0.10);
  color: var(--c-ink-200);
  font-weight: 500;
}
.section:not(.section--ink) .pub--coauthor .pub__if {
  background: var(--c-ink-50);
  color: var(--c-ink-500);
}

/* ============================================================
   21. Compact bio card helpers
   ============================================================ */
.bio-link-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  margin: var(--s-3) 0;
}
.bio-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--r-pill);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--c-ink-700);
  background: var(--c-ink-50);
  border: 1px solid var(--c-ink-100);
  transition: all var(--t-fast) var(--ease-soft);
}
.bio-link:hover {
  background: var(--c-ink-900);
  color: #fff;
  border-color: var(--c-ink-900);
  transform: translateY(-1px);
}
.bio-link svg { width: 14px; height: 14px; }