/* =========================================================
   Zhihao Cao — Academic Homepage
   Blue × Red theme
   ========================================================= */

:root {
  /* Blue family */
  --blue-50:  #f2ecfe;
  --blue-100: #e7dcfd;
  --blue-200: #ddd1fb;
  --blue-400: #a78bfa;
  --blue-500: #8b5cf6;
  --blue-600: #7c3aed;
  --blue-700: #6d28d9;
  --blue-900: #4c1d95;

  /* Accent-2 tints (purple) */
  --red-50:  #f4ecfe;
  --red-100: #ebdcfc;
  --red-400: #c084fc;
  --red-500: #9333ea;
  --red-600: #7e22ce;
  --red-700: #6b21a8;

  /* Neutrals */
  --bg:        #fbfcff;
  --surface:   #ffffff;
  --surface-2: #f4f7fd;
  --line:      #e4e9f4;
  --ink:       #16213a;
  --ink-soft:  #475067;
  --ink-mute:  #828ca6;

  --accent:    #7c3aed;
  --accent-2:  #9333ea;

  /* Purple gradient used on rings, bars, buttons */
  --grad: linear-gradient(120deg, #6d28d9 0%, #8b5cf6 50%, #a855f7 100%);
  --grad-soft: linear-gradient(120deg, #f3ecfe, #faf5ff);

  --shadow-sm: 0 1px 2px rgba(40,30,80,.06), 0 2px 6px rgba(40,30,80,.05);
  --shadow-md: 0 6px 18px rgba(40,30,80,.08), 0 2px 6px rgba(40,30,80,.05);
  --shadow-lg: 0 18px 50px rgba(40,30,80,.14), 0 6px 16px rgba(40,30,80,.08);
  --shadow-color: 0 14px 34px rgba(124,58,237,.20);

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --maxw: 1080px;

  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
}

html[data-theme="dark"] {
  --bg:        #0b1020;
  --surface:   #121a30;
  --surface-2: #172238;
  --line:      #28324c;
  --ink:       #eaf0fb;
  --ink-soft:  #b6c2da;
  --ink-mute:  #8794b0;

  --blue-50:  #241a3f;
  --blue-100: #2c2150;
  --blue-200: #392a63;
  --blue-900: #d8c8ff;
  --red-50:   #281a3a;

  --accent:   #a78bfa;
  --accent-2: #c084fc;

  --grad: linear-gradient(120deg, #8b5cf6 0%, #a78bfa 50%, #c084fc 100%);
  --grad-soft: linear-gradient(120deg, #281a3a, #241a3f);

  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 8px 22px rgba(0,0,0,.42);
  --shadow-lg: 0 22px 55px rgba(0,0,0,.55);
  --shadow-color: 0 16px 40px rgba(79,125,255,.28);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
html.scroll-smooth { scroll-padding-top: 92px; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-2); }
em { font-style: italic; }
strong { font-weight: 650; color: var(--ink); }

::selection { background: var(--blue-200); color: var(--blue-900); }

/* ---------- Background aurora ---------- */
.bg-aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(560px 460px at 10% -4%, rgba(124,58,237,.16), transparent 60%),
    radial-gradient(520px 440px at 92% 2%, rgba(147,51,234,.13), transparent 58%),
    radial-gradient(620px 560px at 75% 96%, rgba(168,85,247,.10), transparent 60%);
}
html[data-theme="dark"] .bg-aurora {
  background:
    radial-gradient(580px 480px at 10% -6%, rgba(167,139,250,.22), transparent 60%),
    radial-gradient(540px 460px at 92% 2%, rgba(192,132,252,.16), transparent 58%),
    radial-gradient(640px 580px at 75% 96%, rgba(139,92,246,.14), transparent 60%);
}

/* =========================================================
   NAVBAR
   ========================================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--surface) 78%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nav__brand { display: flex; align-items: center; gap: 11px; color: var(--ink); font-weight: 700; }
.nav__brand-mark {
  display: grid; place-items: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--grad);
  color: #fff;
  font-size: 14px; font-weight: 800; letter-spacing: .5px;
  box-shadow: var(--shadow-color);
}
.nav__brand-name { font-size: 16.5px; letter-spacing: -.2px; }

.nav__links { display: flex; align-items: center; gap: 4px; }
.nav__link {
  position: relative;
  color: var(--ink-soft);
  font-size: 14.5px;
  font-weight: 500;
  padding: 8px 13px;
  border-radius: 9px;
  transition: color .2s, background .2s;
}
.nav__link:hover { color: var(--accent); background: var(--blue-50); }
.nav__link.active { color: var(--accent); }
.nav__link.active::after {
  content: "";
  position: absolute;
  left: 13px; right: 13px; bottom: 2px;
  height: 2px; border-radius: 2px;
  background: var(--grad);
}

.nav__actions { display: flex; align-items: center; gap: 8px; }
.theme-toggle {
  display: grid; place-items: center;
  width: 38px; height: 38px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-soft);
  border-radius: 10px;
  cursor: pointer;
  transition: all .2s;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.nav__burger { display: none; flex-direction: column; gap: 5px; width: 40px; height: 38px; align-items: center; justify-content: center; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; cursor: pointer; }
.nav__burger span { display: block; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; transition: .25s; }
.nav__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__progress { height: 2px; width: 0%; background: var(--grad); transition: width .1s linear; }

/* =========================================================
   HERO
   ========================================================= */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 124px 24px 56px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 54px;
  align-items: center;
}
.hero__photo-wrap { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.hero__photo-ring {
  width: 224px; height: 224px;
  border-radius: 50%;
  padding: 5px;
  background: var(--grad);
  box-shadow: var(--shadow-color);
  position: relative;
}
.hero__photo-ring::after {
  content: "";
  position: absolute; inset: -7px;
  border-radius: 50%;
  border: 1.5px dashed color-mix(in srgb, var(--accent) 40%, transparent);
  animation: spin 26s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.hero__photo {
  width: 100%; height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--surface);
}
.hero__status {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 12.5px; font-weight: 600;
  color: var(--accent-2);
  background: var(--red-50);
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent-2) 22%, transparent);
}
.hero__status .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent-2) 60%, transparent); animation: pulse 2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent-2) 55%, transparent); } 70% { box-shadow: 0 0 0 8px transparent; } 100% { box-shadow: 0 0 0 0 transparent; } }

.hero__eyebrow { color: var(--accent); font-weight: 600; font-size: 15px; letter-spacing: .3px; margin-bottom: 6px; }
.hero__name {
  font-family: var(--serif);
  font-size: clamp(2.6rem, 5.4vw, 3.7rem);
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -.5px;
  color: var(--ink);
}
.hero__name-cn { font-size: .52em; color: var(--ink-mute); font-weight: 500; margin-left: 8px; letter-spacing: 2px; }
.hero__title { margin-top: 14px; font-size: 1.18rem; font-weight: 600; color: var(--ink); }
.hero__affil { margin-top: 8px; display: flex; align-items: center; gap: 8px; color: var(--ink-soft); font-size: 1.02rem; }
.hero__affil svg { color: var(--accent); }
.hero__affil strong { color: var(--accent); }

.hero__interests { list-style: none; display: flex; flex-wrap: wrap; gap: 9px; margin-top: 20px; padding: 0; }
.hero__interests li {
  font-size: 13.5px; font-weight: 550;
  padding: 6px 14px;
  border-radius: 999px;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: transform .2s, border-color .2s, color .2s;
}
.hero__interests li:hover { transform: translateY(-2px); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }

.hero__socials { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.social {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px;
  border-radius: 11px;
  font-size: 14px; font-weight: 600;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: all .22s cubic-bezier(.3,.7,.3,1);
}
.social:hover {
  color: #fff;
  background: var(--grad);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-color);
}
.social svg { transition: transform .2s; }
.social:hover svg { transform: scale(1.12); }

/* =========================================================
   LAYOUT / SECTIONS
   ========================================================= */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 56px 0; scroll-margin-top: 84px; }
.section__head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 26px; }
.section__kicker {
  font-family: var(--serif);
  font-size: 1rem; font-weight: 600;
  color: #fff;
  background: var(--grad);
  width: 38px; height: 30px;
  display: grid; place-items: center;
  border-radius: 8px;
  box-shadow: var(--shadow-color);
  flex: none;
  font-variant-numeric: tabular-nums;
}
.section__title {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3.4vw, 2.15rem);
  font-weight: 600;
  letter-spacing: -.3px;
  color: var(--ink);
  position: relative;
}
.section__title::after {
  content: "";
  display: block;
  width: 46px; height: 4px;
  margin-top: 11px;
  border-radius: 4px;
  background: var(--sec, var(--accent));
}
.section__lead { color: var(--ink-soft); margin: -12px 0 26px; font-size: 1.02rem; }
.section__lead .muted, .muted { color: var(--ink-mute); font-size: .9em; }

/* ---------- About ---------- */
.about { font-size: 1.05rem; color: var(--ink-soft); }
.about p { margin-bottom: 16px; }
.about p:last-child { margin-bottom: 0; }
.hl {
  font-weight: 600;
  color: var(--ink);
  background: linear-gradient(transparent 62%, color-mix(in srgb, var(--accent) 24%, transparent) 0);
  padding: 0 2px;
}

/* News */
.news {
  margin-top: 30px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px 26px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}
.news::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--grad); }
.news__title { font-family: var(--serif); font-size: 1.2rem; font-weight: 600; margin-bottom: 14px; color: var(--ink); }
.news__list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 11px; }
.news__item { display: flex; gap: 16px; align-items: baseline; font-size: .98rem; color: var(--ink-soft); }
.news__date {
  flex: none; width: 76px;
  font-size: 12.5px; font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
html[data-theme="dark"] .news__date { color: var(--accent); }

/* =========================================================
   PUBLICATIONS
   ========================================================= */
.pub-list { display: flex; flex-direction: column; gap: 22px; }
.pub {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.pub:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.pub__media {
  display: block;
  border-radius: var(--r-sm);
  overflow: hidden;
  align-self: center;
  background: var(--surface-2);
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
}
.pub__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.pub__media:hover img { transform: scale(1.06); }

.pub__body { display: flex; flex-direction: column; }
.pub__venue {
  align-self: flex-start;
  font-size: 11.5px; font-weight: 700; letter-spacing: .4px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--blue-50);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 9px;
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
}
.pub__title {
  font-family: var(--serif);
  font-size: 1.24rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
  letter-spacing: -.2px;
}
.pub__authors { margin-top: 8px; font-size: .96rem; color: var(--ink-soft); }
.pub__authors .me { color: var(--accent-2); font-weight: 700; }
.pub__authors sup { color: var(--accent-2); font-weight: 700; }
.pub__journal { margin-top: 5px; font-size: .92rem; color: var(--ink-mute); }

.pub__links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12.5px; font-weight: 600;
  padding: 6px 12px;
  border-radius: 8px;
  color: #fff;
  background: var(--accent);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .2s;
}
.chip svg { opacity: .92; }
.chip:hover { background: var(--accent-2); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-md); }
.chip--ghost {
  color: var(--ink-soft);
  background: var(--surface-2);
  border-color: var(--line);
}
.chip--ghost:hover { color: var(--accent); background: var(--blue-50); border-color: var(--accent); box-shadow: none; }

.pub__bibtex {
  display: none;
  margin-top: 14px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-sm);
  padding: 14px 16px;
  font-family: "SFMono-Regular", "JetBrains Mono", Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-soft);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}
.pub__bibtex.show { display: block; animation: slideDown .25s ease; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }

/* =========================================================
   PROJECTS — horizontal cards (media left, body right)
   ========================================================= */
.proj-list { display: flex; flex-direction: column; gap: 22px; }
.proj {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.proj:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--accent-2) 30%, transparent); }
.proj__media {
  display: block;
  aspect-ratio: 16 / 9;
  align-self: center;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  overflow: hidden;
}
.proj__media img, .proj__media video { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.proj__media:hover img, .proj__media:hover video { transform: scale(1.05); }
.proj__body { display: flex; flex-direction: column; }
.proj__title { font-family: var(--serif); font-size: 1.2rem; font-weight: 600; line-height: 1.3; color: var(--ink); }
.proj__sub { margin-top: 6px; font-size: .85rem; font-weight: 600; color: var(--accent); }
.proj__desc { margin-top: 9px; font-size: .96rem; color: var(--ink-soft); }
.proj .pub__links { margin-top: 14px; }

/* =========================================================
   CV / TIMELINE
   ========================================================= */
.cv { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; }
.cv__heading { font-family: var(--serif); font-size: 1.25rem; font-weight: 600; color: var(--ink); display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.cv__dot { width: 11px; height: 11px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--blue-50); }
.cv__dot--red { background: var(--accent-2); box-shadow: 0 0 0 4px var(--red-50); }

.timeline { position: relative; padding-left: 22px; }
.timeline::before { content: ""; position: absolute; left: 4px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--accent), var(--accent-2)); border-radius: 2px; opacity: .35; }
.tl { position: relative; padding-bottom: 22px; }
.tl:last-child { padding-bottom: 0; }
.tl::before {
  content: ""; position: absolute; left: -22px; top: 6px;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--surface);
  border: 2.5px solid var(--accent);
  transform: translateX(-1px);
}
.cv__col:nth-child(2) .tl::before { border-color: var(--accent-2); }
.tl__row { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.tl__row h4 { font-size: 1.02rem; font-weight: 650; color: var(--ink); }
.tl__date { flex: none; font-size: 12.5px; font-weight: 600; color: var(--ink-mute); font-variant-numeric: tabular-nums; white-space: nowrap; }
.tl__where { font-size: .92rem; color: var(--accent); font-weight: 550; margin-top: 2px; }
.tl__pts { list-style: none; padding: 0; margin-top: 6px; }
.tl__pts li { position: relative; padding-left: 15px; font-size: .9rem; color: var(--ink-soft); margin-bottom: 3px; }
.tl__pts li::before { content: ""; position: absolute; left: 0; top: .62em; width: 5px; height: 5px; border-radius: 50%; background: color-mix(in srgb, var(--accent) 60%, transparent); }

/* =========================================================
   AWARDS — horizontal cards (year left, body, icon right)
   ========================================================= */
.awards { display: flex; flex-direction: column; gap: 16px; }
.award {
  display: flex; align-items: center; gap: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 18px 22px;
  box-shadow: var(--shadow-sm);
  transition: transform .22s, box-shadow .22s, border-color .22s;
  position: relative;
  overflow: hidden;
}
.award::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--grad); opacity: 0; transition: opacity .22s; }
.award:hover { transform: translateX(4px); box-shadow: var(--shadow-md); border-color: color-mix(in srgb, var(--accent) 28%, transparent); }
.award:hover::before { opacity: 1; }
.award__year {
  flex: none;
  font-family: var(--serif);
  font-size: 1.5rem; font-weight: 600;
  color: var(--accent);
  width: 66px;
  text-align: center;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  position: relative;
}
.award__year::after { content: ""; position: absolute; right: -10px; top: 50%; transform: translateY(-50%); height: 32px; width: 1px; background: var(--line); }
.award__body { flex: 1; }
.award__body h4 { font-size: 1.04rem; font-weight: 650; color: var(--ink); line-height: 1.35; }
.award__body p { font-size: .92rem; color: var(--ink-soft); margin-top: 4px; }
.award__icon { flex: none; color: color-mix(in srgb, var(--accent-2) 75%, transparent); opacity: .6; }
.badge { display: inline-block; font-size: 11.5px; font-weight: 700; padding: 3px 11px; border-radius: 999px; vertical-align: middle; }
.badge--gold { color: #8a5a00; background: #ffe8b0; }
.badge--silver { color: #4a5568; background: #e2e8f0; }
html[data-theme="dark"] .badge--gold { color: #ffd47a; background: #4a3a12; }
html[data-theme="dark"] .badge--silver { color: #cbd5e1; background: #2c3650; }

/* =========================================================
   MORE: Teaching + Service — horizontal cards (aside left, body right)
   ========================================================= */
.more-list { display: flex; flex-direction: column; gap: 18px; }
.more-card {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 24px;
  align-items: start;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px 26px;
  box-shadow: var(--shadow-sm);
  transition: transform .22s, box-shadow .22s, border-color .22s;
}
.more-card:hover { transform: translateX(4px); box-shadow: var(--shadow-md); border-color: color-mix(in srgb, var(--accent) 24%, transparent); }
.more-card__aside {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--serif); font-size: 1.18rem; font-weight: 600;
  color: var(--accent);
  padding-top: 1px;
}
.more-card__aside svg { color: var(--accent); flex: none; }
.more-card__aside--red, .more-card__aside--red svg { color: var(--accent-2); }
.more-card__content h4 { font-size: 1.02rem; font-weight: 650; color: var(--ink); line-height: 1.35; }
.svc__role { color: var(--accent-2) !important; }
.svc__list { list-style: none; padding: 0; margin-top: 10px; }
.svc__list li { position: relative; padding-left: 16px; font-size: .94rem; color: var(--ink-soft); margin-bottom: 7px; }
.svc__list li::before { content: ""; position: absolute; left: 0; top: .6em; width: 6px; height: 6px; border-radius: 2px; background: var(--accent-2); }
.tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 11px; }
.tag { font-size: 12px; font-weight: 600; color: var(--accent); background: var(--blue-50); padding: 4px 11px; border-radius: 999px; border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent); }

/* =========================================================
   FOOTER
   ========================================================= */
.footer { border-top: 1px solid var(--line); background: var(--surface); margin-top: 40px; }
.footer__inner { max-width: var(--maxw); margin: 0 auto; padding: 34px 24px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px; }
.footer__left { display: flex; flex-direction: column; }
.footer__name { font-family: var(--serif); font-size: 1.15rem; font-weight: 600; color: var(--ink); }
.footer__loc { font-size: .85rem; color: var(--ink-mute); }
.footer__socials { display: flex; gap: 6px; }
.footer__socials a { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 9px; color: var(--ink-soft); border: 1px solid var(--line); transition: all .2s; }
.footer__socials a:hover { color: #fff; background: var(--grad); border-color: transparent; transform: translateY(-2px); }
.footer__copy { width: 100%; text-align: center; font-size: 12.5px; color: var(--ink-mute); border-top: 1px solid var(--line); padding-top: 18px; margin-top: 4px; }

/* ---------- Back to top ---------- */
.to-top {
  position: fixed; right: 24px; bottom: 24px;
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border: none; border-radius: 13px;
  background: var(--grad);
  color: #fff;
  cursor: pointer;
  box-shadow: var(--shadow-color);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: all .3s;
  z-index: 90;
}
.to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { transform: translateY(-3px) scale(1.05); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 30px;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: var(--bg);
  padding: 11px 22px; border-radius: 11px;
  font-size: 14px; font-weight: 600;
  box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden;
  transition: all .3s;
  z-index: 200;
}
.toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* =========================================================
   REVEAL ANIMATION
   ========================================================= */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .65s cubic-bezier(.2,.7,.2,1), transform .65s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero__photo-ring::after, .hero__status .dot { animation: none; }
  html { scroll-behavior: auto; }
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; text-align: center; gap: 30px; padding-top: 104px; }
  .hero__intro { display: flex; flex-direction: column; align-items: center; }
  .hero__affil { justify-content: center; }
  .hero__interests, .hero__socials { justify-content: center; }
  .pub { grid-template-columns: 1fr; }
  .pub__media { aspect-ratio: 16 / 8; }
  .proj { grid-template-columns: 1fr; }
  .proj__media { aspect-ratio: 16 / 8; }
  .cv { grid-template-columns: 1fr; }
  .more-card { grid-template-columns: 1fr; gap: 12px; }
}

@media (max-width: 680px) {
  body { font-size: 16px; }
  .nav__links {
    position: fixed;
    top: 66px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: 12px 18px 18px;
    gap: 4px;
    box-shadow: var(--shadow-lg);
    transform: translateY(-130%);
    transition: transform .32s cubic-bezier(.3,.7,.3,1);
    z-index: 99;
  }
  .nav__links.open { transform: translateY(0); }
  .nav__link { padding: 11px 14px; font-size: 15.5px; }
  .nav__link.active::after { display: none; }
  .nav__burger { display: flex; }
  .section { padding: 44px 0; }
  .footer__inner { flex-direction: column; text-align: center; }
}