/* ──────────────────────────────────────────────────────────────
   Maida Wang — personal site
   Dark-tech academic theme · quantum-tinted accents
   ────────────────────────────────────────────────────────────── */

:root {
  /* palette */
  --bg-0:        #07090f;
  --bg-1:        #0b101c;
  --bg-2:        #11172a;
  --surface:     #131a2e;
  --surface-hi:  #1a2240;
  --border:      #1f2640;
  --border-hi:   #2a3358;

  --text-1:      #e8ecf5;
  --text-2:      #aab2c8;
  --text-3:      #6c7691;
  --text-dim:    #495069;

  --accent:      #5cf0ff;   /* electric cyan */
  --accent-2:    #8b6cff;   /* violet */
  --accent-3:    #ff7ad6;   /* magenta */
  --accent-warm: #ffd166;

  --grad:        linear-gradient(135deg, #5cf0ff 0%, #8b6cff 55%, #ff7ad6 100%);
  --grad-soft:   linear-gradient(135deg, rgba(92,240,255,.15), rgba(139,108,255,.15));

  /* typography */
  --f-sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --f-disp:  "Space Grotesk", "Inter", system-ui, sans-serif;
  --f-mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* layout */
  --content-w: 1080px;
  --rad:       14px;
  --rad-sm:    8px;
}

/* ─── reset ─────────────────────────────────────────────── */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }
html, body { height: 100%; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; border: 0; background: none; color: inherit; cursor: pointer; }

body {
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-1);
  background: var(--bg-0);
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(139,108,255,.18), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(92,240,255,.12), transparent 55%),
    radial-gradient(900px 700px at 50% 110%, rgba(255,122,214,.08), transparent 60%);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.005em;
}

/* subtle grid overlay */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  z-index: 0;
}

#bg-canvas {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: .55;
}

main, .nav, .foot { position: relative; z-index: 1; }

/* ─── nav ──────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0;
  z-index: 50;
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  background: rgba(7,9,15,.55);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 14px 28px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.nav__brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--f-disp);
  font-weight: 600;
}
.nav__brand-mark {
  display: inline-grid; place-items: center;
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--grad);
  color: #0a0e1a;
  font-family: var(--f-mono);
  font-size: 12px; font-weight: 700;
  letter-spacing: 0;
  box-shadow: 0 4px 18px rgba(92,240,255,.25);
}
.nav__brand-name { font-size: 15px; color: var(--text-1); }

.nav__links { display: flex; gap: 6px; flex-wrap: wrap; }
.nav__links a {
  font-size: 13.5px;
  color: var(--text-2);
  padding: 8px 12px;
  border-radius: 8px;
  transition: color .2s ease, background .2s ease;
  position: relative;
}
.nav__links a:hover { color: var(--text-1); background: rgba(255,255,255,.04); }
.nav__links a.is-active {
  color: var(--text-1);
  background: rgba(92,240,255,.08);
}
.nav__links a.is-active::after {
  content: "";
  position: absolute; left: 12px; right: 12px; bottom: 3px;
  height: 1px;
  background: var(--grad);
}

.nav__toggle { display: none; width: 36px; height: 36px; flex-direction: column; align-items: center; justify-content: center; gap: 5px; }
.nav__toggle span { width: 20px; height: 1.5px; background: var(--text-1); transition: .25s; }

/* ─── hero ─────────────────────────────────────────────── */
.hero {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 80px 28px 60px;
}
.hero__inner {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 56px;
  align-items: start;
}

/* portrait */
.hero__portrait { position: relative; width: 280px; aspect-ratio: 1 / 1; }
.portrait-frame {
  position: relative;
  width: 100%; height: 100%;
  border-radius: 50%;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border-hi);
  box-shadow:
    0 0 0 6px rgba(255,255,255,.02),
    0 20px 60px -10px rgba(92,240,255,.25),
    0 30px 80px -20px rgba(139,108,255,.25);
}
.portrait-frame img { width: 100%; height: 100%; object-fit: cover; }
.portrait-placeholder {
  display: none;
  position: absolute; inset: 0;
  align-items: center; justify-content: center;
  font-family: var(--f-mono); font-size: 12px; color: var(--text-3);
  background:
    repeating-linear-gradient(45deg,
      rgba(255,255,255,.03) 0 10px,
      transparent 10px 20px),
    var(--surface);
}
/* bloch sphere wireframe around portrait */
.bloch {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 460px; height: 460px;
  cursor: grab;
  z-index: 0;
  touch-action: none;
}
.bloch:active { cursor: grabbing; }
.hero__portrait .portrait-frame { position: relative; z-index: 1; }

.bloch-hint {
  position: absolute;
  bottom: -34px; left: 50%;
  transform: translateX(-50%);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
  opacity: 1;
  transition: opacity .6s ease;
  pointer-events: none;
  animation: hintPulse 2.4s ease-in-out infinite;
}
.bloch-hint::before {
  content: "↻ ";
  margin-right: 4px;
  display: inline-block;
}
.hero__portrait.is-rotated .bloch-hint {
  opacity: 0;
  animation: none;
}
@keyframes hintPulse {
  0%, 100% { opacity: .55; }
  50%      { opacity: 1; }
}

/* hero body */
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--f-mono); font-size: 12px;
  color: var(--text-2);
  padding: 6px 10px;
  border: 1px solid var(--border-hi);
  border-radius: 999px;
  background: rgba(255,255,255,.02);
  margin-bottom: 22px;
}
.hero__eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 1.8s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50%     { opacity: .5; transform: scale(.85); }
}

.hero__name {
  font-family: var(--f-disp);
  font-size: clamp(44px, 6vw, 72px);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.hero__name .grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__tagline {
  font-size: 18px;
  color: var(--text-2);
  max-width: 600px;
  line-height: 1.65;
}
.hero__tagline em {
  font-style: normal;
  color: var(--text-1);
  border-bottom: 1px dotted var(--accent);
  padding-bottom: 1px;
}

.hero__meta {
  margin: 28px 0 22px;
  display: flex; flex-wrap: wrap; gap: 12px 26px;
  font-size: 13.5px;
}
.hero__meta li { display: flex; flex-direction: column; gap: 2px; }
.hero__meta .k { font-family: var(--f-mono); font-size: 11px; color: var(--text-3); text-transform: uppercase; letter-spacing: .08em; }
.hero__meta .v { color: var(--text-1); }

.hero__links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }

.chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 14px;
  font-size: 13px;
  color: var(--text-1);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: all .2s ease;
}
.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 6px 22px -8px rgba(92,240,255,.4);
}

/* hero scroll cue */
.hero__scroll {
  display: flex; flex-direction: column;
  align-items: center; gap: 10px;
  width: max-content;
  margin: 50px auto 0;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--text-3);
  transition: color .25s;
}
.hero__scroll:hover { color: var(--accent); }
.hero__scroll-line {
  width: 1px; height: 32px;
  background: linear-gradient(to bottom, transparent, var(--accent));
  animation: scrollLine 2.2s ease-in-out infinite;
}
@keyframes scrollLine {
  0%, 100% { transform: scaleY(.4); transform-origin: top; opacity: .5; }
  50%      { transform: scaleY(1);  transform-origin: top; opacity: 1; }
}

/* ─── sections ─────────────────────────────────────────── */
.section {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 70px 28px;
}
.section__header {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 36px;
}
.section__index {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--accent);
  padding: 4px 8px;
  background: rgba(92,240,255,.08);
  border-radius: 4px;
  letter-spacing: .1em;
}
.section__title {
  font-family: var(--f-disp);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.section__line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--border-hi), transparent);
}

/* ─── prose ────────────────────────────────────────────── */
.prose {
  max-width: 760px;
  color: var(--text-2);
  font-size: 16.5px;
  line-height: 1.78;
}
.prose p + p { margin-top: 18px; }
.prose strong { color: var(--text-1); font-weight: 600; }
.prose em { color: var(--text-1); font-style: italic; }
.prose a {
  color: var(--text-1);
  border-bottom: 1px solid rgba(92,240,255,.35);
  transition: color .2s, border-color .2s;
}
.prose a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ─── grid + cards ─────────────────────────────────────── */
.grid { display: grid; gap: 18px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 24px;
  position: relative;
  overflow: hidden;
  transition: transform .25s ease, border-color .25s ease;
}
.card::before {
  content: "";
  position: absolute; inset: 0;
  border-radius: var(--rad);
  padding: 1px;
  background: var(--grad);
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0;
  transition: opacity .3s;
  pointer-events: none;
}
.card:hover { transform: translateY(-3px); }
.card:hover::before { opacity: .6; }

.card__icon {
  font-family: var(--f-mono);
  font-size: 22px;
  color: var(--accent);
  margin-bottom: 14px;
  letter-spacing: -.02em;
}
.card h3 {
  font-family: var(--f-disp);
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-1);
}
.card p { color: var(--text-2); font-size: 14.5px; line-height: 1.65; }

.card--project { padding-top: 38px; }
.card__tag {
  position: absolute; top: 14px; right: 14px;
  font-family: var(--f-mono); font-size: 10.5px;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent);
  background: rgba(92,240,255,.08);
  padding: 4px 8px;
  border-radius: 4px;
}

.card__partners {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-hi);
}
.card__partners span {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: .04em;
  color: var(--text-3);
  padding: 3px 8px;
  border: 1px solid var(--border-hi);
  border-radius: 999px;
  background: rgba(255,255,255,.02);
}

/* ─── news ─────────────────────────────────────────────── */
.news { display: flex; flex-direction: column; }
.news__item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 24px;
  padding: 18px 0;
  border-top: 1px solid var(--border);
  align-items: baseline;
}
.news__item:first-child { border-top: 0; padding-top: 4px; }
.news__item time {
  font-family: var(--f-mono);
  font-size: 12.5px;
  color: var(--text-3);
  letter-spacing: .04em;
  padding-top: 2px;
}
.news__body { color: var(--text-2); font-size: 15.5px; line-height: 1.65; }
.news__body em { color: var(--text-1); font-style: italic; }
.news__body strong { color: var(--text-1); }
.news__item--press .news__body { color: var(--text-2); }

.badge {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent-3);
  background: rgba(255,122,214,.1);
  padding: 2px 7px;
  border-radius: 4px;
  margin-right: 6px;
  vertical-align: 2px;
}
.badge--award {
  color: var(--accent-warm);
  background: rgba(255, 209, 102, .12);
}

.ext {
  margin-left: 6px;
  color: var(--accent);
  font-family: var(--f-mono);
  font-size: 12.5px;
  white-space: nowrap;
}
.ext:hover { text-decoration: underline; }

/* ─── publications ─────────────────────────────────────── */
.pubs { display: flex; flex-direction: column; gap: 14px; margin-top: 14px; }
.pub {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 22px;
  padding: 20px;
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  transition: border-color .25s ease, transform .25s ease;
}
.pub:hover { border-color: var(--border-hi); transform: translateY(-2px); }

.pub__thumb {
  width: 90px; height: 110px;
  border-radius: var(--rad-sm);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  font-family: var(--f-mono); font-weight: 700; font-size: 16px;
  color: #0a0e1a;
  position: relative; overflow: hidden;
  letter-spacing: .02em;
}
.pub__thumb span {
  font-size: 10px;
  letter-spacing: .1em;
  margin-top: 4px;
  font-weight: 500;
}
.pub__thumb--sa     { background: linear-gradient(135deg, #5cf0ff, #8b6cff); }
.pub__thumb--prr    { background: linear-gradient(135deg, #ffd166, #ff7ad6); }
.pub__thumb--arx    { background: linear-gradient(135deg, #6c7691, #aab2c8); color: var(--bg-0); }
.pub__thumb--ent    { background: linear-gradient(135deg, #8b6cff, #ff7ad6); }
.pub__thumb--theory {
  background: var(--bg-2);
  color: var(--accent);
  border: 1px solid var(--accent);
  box-shadow: inset 0 0 24px rgba(92,240,255,.15);
}
.pub__thumb--theory span { color: var(--text-2); }

.pub__title {
  font-family: var(--f-disp);
  font-size: 16.5px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 6px;
  line-height: 1.4;
}
.pub__authors { color: var(--text-2); font-size: 14px; }
.pub__authors strong { color: var(--accent); font-weight: 600; }
.pub__venue { color: var(--text-3); font-size: 13.5px; margin-top: 2px; }
.pub__links { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px; }
.pub__links a {
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--text-2);
  padding: 4px 9px;
  border: 1px solid var(--border-hi);
  border-radius: 4px;
  transition: all .2s;
}
.pub__links a:hover { color: var(--accent); border-color: var(--accent); background: rgba(92,240,255,.06); }

/* ─── timeline ─────────────────────────────────────────── */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: ""; position: absolute;
  left: 7px; top: 8px; bottom: 8px; width: 1px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-2), transparent);
  opacity: .5;
}
.timeline__item { position: relative; padding: 10px 0 22px; }
.timeline__dot {
  position: absolute; left: -28px; top: 14px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg-0);
  border: 2px solid var(--accent);
  box-shadow: 0 0 12px rgba(92,240,255,.4);
}
.timeline__dot--alt {
  border-color: var(--accent-3);
  box-shadow: 0 0 12px rgba(255,122,214,.4);
}
.timeline__item--break { margin-top: 8px; }
.timeline__item--break .timeline__when { color: var(--accent-3); }
.timeline__when {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: .06em;
  margin-bottom: 6px;
}
.timeline__body h3 {
  font-family: var(--f-disp);
  font-size: 17px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 4px;
}
.timeline__body p { color: var(--text-2); font-size: 14.5px; }

/* ─── contact ──────────────────────────────────────────── */
.section--contact { padding-bottom: 90px; }
.contact { max-width: 700px; }
.contact p { color: var(--text-2); font-size: 16px; margin-bottom: 22px; }

.contact__email {
  display: flex; align-items: center; gap: 14px;
  padding: 18px 22px;
  background: var(--surface);
  border: 1px solid var(--border-hi);
  border-radius: var(--rad);
  position: relative; overflow: hidden;
}
.contact__email::before {
  content: ""; position: absolute; inset: 0;
  background: var(--grad-soft);
  opacity: .35;
  pointer-events: none;
}
.contact__email .mono {
  font-family: var(--f-mono);
  font-size: 16px;
  color: var(--text-1);
  position: relative;
  z-index: 1;
  flex: 1;
}
.contact__email .at { color: var(--accent); padding: 0 1px; }
.copy {
  position: relative; z-index: 1;
  padding: 8px 14px;
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--text-1);
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border-hi);
  border-radius: 6px;
  transition: all .2s;
}
.copy:hover { color: var(--accent); border-color: var(--accent); }
.copy.is-copied { color: var(--accent); }

/* ─── helpers ──────────────────────────────────────────── */
.muted { color: var(--text-3); }
.small { font-size: 13px; }
.mono  { font-family: var(--f-mono); }
.kbd {
  font-family: var(--f-mono); font-size: 11px;
  padding: 1px 5px; border-radius: 3px;
  background: rgba(255,255,255,.06); color: var(--text-1);
  border: 1px solid var(--border-hi);
}

/* ─── footer ───────────────────────────────────────────── */
.foot {
  border-top: 1px solid var(--border);
  padding: 26px 28px;
  background: rgba(7,9,15,.5);
}
.foot__inner {
  max-width: var(--content-w);
  margin: 0 auto;
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between;
  gap: 14px;
  font-size: 13px;
  color: var(--text-3);
}
.foot__left, .foot__right { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.foot__inner .mono { color: var(--text-dim); }
.foot__right a {
  color: var(--text-2);
  transition: color .2s;
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
}
.foot__right a:hover { color: var(--accent); }

/* ─── floating back-to-top ─────────────────────────────── */
.to-top {
  position: fixed;
  right: 22px; bottom: 22px;
  z-index: 60;
  width: 42px; height: 42px;
  display: inline-grid; place-items: center;
  background: rgba(19, 26, 46, .85);
  border: 1px solid var(--border-hi);
  border-radius: 50%;
  color: var(--text-2);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  transform: translateY(8px) scale(.9);
  transition: opacity .25s ease, transform .25s ease, color .2s, border-color .2s;
}
.to-top.is-visible {
  opacity: 1;
  transform: none;
}
.to-top:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 6px 22px -8px rgba(92,240,255,.4);
}

/* ─── reveal anim ──────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ─── responsive ───────────────────────────────────────── */
@media (max-width: 880px) {
  .hero { padding-top: 50px; }
  .hero__inner { grid-template-columns: 1fr; gap: 32px; }
  .hero__portrait { width: 200px; }
  .bloch       { transform: translate(-50%, -50%) scale(0.55); }
  .bloch-hint  { display: none; }
  .grid--3 { grid-template-columns: 1fr; }
  .grid--2 { grid-template-columns: 1fr; }
  .news__item { grid-template-columns: 1fr; gap: 4px; }
  .news__item time { font-size: 11.5px; }
  .pub { grid-template-columns: 70px 1fr; gap: 16px; padding: 16px; }
  .pub__thumb { width: 70px; height: 88px; font-size: 14px; }
  .nav__links { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; padding: 12px; background: rgba(7,9,15,.95); border-bottom: 1px solid var(--border); gap: 2px; }
  .nav__links.is-open { display: flex; }
  .nav__toggle { display: flex; }
  .section { padding: 50px 22px; }
  .section__title { font-size: 24px; }
}
@media (max-width: 480px) {
  .hero { padding-left: 22px; padding-right: 22px; }
  .hero__portrait { width: 160px; }
  .bloch { transform: translate(-50%, -50%) scale(0.45); }
  .nav__inner { padding: 12px 18px; }
  .nav__brand-name { display: none; }
  .contact__email { flex-direction: column; align-items: flex-start; gap: 10px; }
}

/* ─── reduce motion ────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}