/* Clean, light, mild-contrast academic style with glass top nav.
   Light theme by default, with optional dark theme toggle via html[data-theme="dark"].
   Accent color: rose (used sparingly). */

/* =========================
   Theme tokens
   ========================= */
:root{
  --bg: #fbfcff;
  --surface: #ffffff;
  --surface2: #f3f6ff;

  --text: #0b1220;
  --muted: #445166;

  --border: rgba(2,6,23,0.10);
  --shadow: 0 10px 30px rgba(2,6,23,0.08);

  /* Rose accent (accent only) */
  --primary: #be123c;
  --primary-soft: rgba(190, 18, 60, 0.12);

  --radius: 18px;
  --max: 1100px;
}

/* Dark theme override */
html[data-theme="dark"]{
  --bg: #0b0f1a;
  --surface: #0f172a;
  --surface2: #111c33;

  --text: #e6e8ee;
  --muted: #a8b0bf;

  --border: rgba(255,255,255,0.12);
  --shadow: 0 14px 40px rgba(0,0,0,0.35);

  --primary: #fb7185;
  --primary-soft: rgba(251, 113, 133, 0.16);
}

/* =========================
   Base
   ========================= */
*{ box-sizing:border-box; }
html, body{ height:100%; }

body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  color: var(--text);
  background:
    /* radial-gradient(900px 420px at 15% -10%, color-mix(in srgb, var(--primary) 10%, transparent), transparent 65%),
    radial-gradient(900px 420px at 100% 0%, color-mix(in srgb, var(--primary) 8%, transparent), transparent 62%), */
    var(--bg);
  line-height: 1.65;
}

a{ color: var(--primary); text-decoration:none; }
a:hover{ text-decoration:underline; }

.container{ max-width: var(--max); margin:0 auto; padding: 18px 16px; }
main{ padding: 18px 0 40px; }

hr{ border:0; border-top: 1px solid var(--border); margin: 14px 0; }

/* =========================
   Glass top nav
   ========================= */
header{
  position: sticky;
  top:0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(12px);
}

.navbar{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  flex-wrap: wrap;
}

.brand{
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.3px;
  color: var(--text);
  text-decoration: none;
}
.brand:hover{ text-decoration:none; color: var(--text); }

.navlinks{
  display:flex;
  flex-wrap:wrap;
  gap: 10px 14px;
  align-items:center;
}
.navlinks a{
  color: var(--muted);
  font-weight: 700;
  padding: 7px 9px;
  border-radius: 12px;
}
.navlinks a:hover{
  color: var(--text);
  background: color-mix(in srgb, var(--surface2) 70%, transparent);
  text-decoration:none;
}
.navlinks a[aria-current="page"]{
  color: var(--text);
  background: color-mix(in srgb, var(--surface2) 85%, transparent);
  border: 1px solid var(--border);
  text-decoration:none;
}

.controls{ display:flex; gap:10px; align-items:center; }

select, button{
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, var(--surface2));
  color: var(--text);
  padding: 8px 10px;
  border-radius: 14px;
  cursor:pointer;
}
button:hover, select:hover{ filter: brightness(1.02); }

.mobile{ display:none; }
@media (max-width: 840px){
  .mobile{ display:inline-flex; }
  .navlinks{ display:none; width:100%; padding: 10px 0 2px; }
  .navlinks.open{ display:flex; }
}

/* Theme toggle button (optional) */
.themebtn{
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, var(--surface2));
  color: var(--text);
  padding: 8px 10px;
  border-radius: 14px;
  cursor:pointer;
}
.themebtn:hover{ filter: brightness(1.02); }

/* =========================
   Sections + layout
   ========================= */
.section{ padding: 18px 0; scroll-margin-top: 88px; }
.h1{ font-size: clamp(28px, 3vw, 42px); line-height:1.15; margin: 0 0 6px; letter-spacing:-0.4px; }
.subtitle{ color: var(--muted); margin: 0 0 10px; }

.grid{
  display:grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  align-items:start;
}
@media (max-width: 980px){ .grid{ grid-template-columns:1fr; } }

.card{
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}
.card.soft{
  background: color-mix(in srgb, var(--surface2) 86%, transparent);
}

.avatar{
  width: 150px; height: 150px;
  border-radius: 18px;
  object-fit: cover;
  border: 1px solid var(--border);
}

.chips{ display:flex; flex-wrap:wrap; gap:8px; margin-top: 10px; }
.chip{
  font-size: 13px;
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--muted);
  background: color-mix(in srgb, var(--surface2) 70%, transparent);
}

.kv{ display:grid; grid-template-columns: 140px 1fr; gap: 8px 14px; margin-top: 10px; }
.kv .k{ color: var(--muted); font-weight: 800; }
.kv .v{ color: var(--text); }
@media (max-width: 520px){ .kv{ grid-template-columns:1fr; } }

.item{
  padding: 12px 12px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: color-mix(in srgb, var(--surface2) 72%, transparent);
}
.item + .item{ margin-top: 10px; }
.item .topline{ display:flex; justify-content:space-between; gap:10px; flex-wrap:wrap; }
.item .title{ font-weight: 850; }
.item .meta{ color: var(--muted); font-size: 13px; }

/* =========================
   Education trajectory / timeline
   ========================= */
.timeline{
  position: relative;
  margin-top: 10px;
  padding-left: 18px;
}
.timeline:before{
  content:"";
  position:absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: color-mix(in srgb, var(--primary) 22%, var(--border));
  border-radius: 99px;
}
.tnode{
  position: relative;
  padding: 10px 10px 10px 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  box-shadow: 0 6px 18px rgba(2,6,23,0.05);
}
.tnode + .tnode{ margin-top: 10px; }
.tnode:before{
  content:"";
  position:absolute;
  left: -18px;
  top: 16px;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-soft);
}
.tnode .degree{ font-weight: 800; }
.tnode .school{ color: var(--muted); font-weight: 650; }
.tnode .details{ color: var(--muted); font-size: 14px; margin-top: 6px; }
.edate{
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

/* =========================
   Footer
   ========================= */
.footer{
  padding: 18px 0 30px;
  color: var(--muted);
  font-size: 13px;
  text-align:center;
}

/* =========================
   Home page tweaks (no boxy separation)
   ========================= */
body.home .card,
body.home .card.soft{
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
}
body.home .section{ padding: 10px 0; }
body.home .grid{ align-items: center; }

body.home #bio .card p{ margin: 8px 0; }
body.home #bio .chips{ margin-top: 8px; }
body.home #bio hr{ margin: 10px 0; }

.profile{
  display:flex;
  flex-direction:column;
  align-items:center;
}

.avatar.big{
  width: 260px;
  height: 260px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
  box-shadow: 0 10px 28px rgba(0,0,0,0.08);
  transition: transform 220ms ease, box-shadow 220ms ease;
}
.profile:hover .avatar.big{
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(0,0,0,0.12);
}

.icons{
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  justify-content: center;
  gap: 14px;
}
.icons li a{
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--muted);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  transition: background 160ms ease, color 160ms ease, transform 160ms ease, border-color 160ms ease;
}
.icons li a:hover{
  color: var(--primary);
  background: var(--primary-soft);
  border-color: color-mix(in srgb, var(--primary) 25%, var(--border));
  transform: translateY(-1px);
}
.ai{ font-size: 19px; }

.newsbox{
  max-height: 320px;
  overflow: auto;
  padding-right: 10px;
  /* -webkit-mask-image: linear-gradient(to bottom, transparent 0, black 18px, black calc(100% - 18px), transparent 100%);
          mask-image: linear-gradient(to bottom, transparent 0, black 18px, black calc(100% - 18px), transparent 100%); */
}
.newslist{
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.news{
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: start;
}
.news-ico{
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  font-size: 14px;
  line-height: 1;
  color: color-mix(in srgb, var(--text) 75%, var(--muted));
}
.news-text{
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}
.news.award .news-ico{
  background: var(--primary-soft);
  border-color: color-mix(in srgb, var(--primary) 22%, var(--border));
  color: var(--primary);
}
.news.award .news-text{
  color: color-mix(in srgb, var(--text) 86%, var(--muted));
}

/* =========================
   Research blocks
   ========================= */
.rblock{ padding-top: 10px; }

.rhead{ margin-bottom: 14px; }
.rhead-title{
  margin: 0;
  font-size: 26px;
  font-weight: 750;
  letter-spacing: -0.35px;
}
.rhead-rule{
  margin-top: 10px;
  height: 1px;
  background: var(--border);
}

.rtwo{
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 18px;
  align-items: start;
}
@media (max-width: 980px){ .rtwo{ grid-template-columns: 1fr; } }

.rcard{
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  border-radius: var(--radius);
  padding: 14px;
}
.rsubtitle{
  font-weight: 700;
  color: var(--text);
  margin: 0 0 6px;
}
.rtext{
  margin: 0 0 12px;
  color: var(--muted);
}
.rlist{
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}
.rlist li{ margin: 8px 0; }
.rmeta{
  display: inline-block;
  margin-left: 6px;
  font-size: 13px;
  color: var(--muted);
  opacity: 0.9;
}

.rmedia{
  position: relative;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  border-radius: var(--radius);
  padding: 12px;
  overflow: hidden;
}

.rframe{
  position: relative;
  width: 100%;
  height: 260px;
  border-radius: 14px;
  overflow: hidden;
  background: color-mix(in srgb, var(--surface2) 65%, transparent);
}
.rframe.tall{ height: 435px; }
.rframe.compact{ height: 290px; }

.rimg{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transition: opacity 180ms ease;
  padding: 8px;
}
.rimg.active{ opacity: 1; }

.rnav{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  width: 34px;
  height: 34px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 20px;
  line-height: 0;
  display: grid;
  place-items: center;
  color: var(--text);
}
.rnav.prev{ left: 10px; }
.rnav.next{ right: 10px; }

.rnav:hover{
  background: var(--primary-soft);
  color: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 22%, var(--border));
}

.rdots{
  display: flex;
  gap: 6px;
  justify-content: center;
  margin-top: 10px;
}
.rdot{
  width: 8px;
  height: 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface2) 80%, transparent);
  cursor: pointer;
}
.rdot.active{
  background: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 30%, var(--border));
}

/* =========================
   Experience page (resume-like)
   ========================= */
.exp-entry{ padding: 6px 0 0; }

.exp-head{
  display: flex;
  align-items: baseline;
  gap: 16px;
}
.exp-role{
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.2px;
  color: var(--text);
}
.exp-dates{
  margin-left: auto;
  white-space: nowrap;
  font-size: 15px;
  font-weight: 600;
  color: var(--muted);
}
.exp-affil{
  margin-top: 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}
.exp-block-title{
  margin-top: 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}
.exp-courses{
  margin: 8px 0 0;
  padding-left: 20px;
}
.exp-courses li{ margin: 12px 0 16px; }
.exp-course{
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}
.exp-terms{
  margin-top: 4px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.55;
}
.exp-terms-label{
  font-weight: 600;
  color: var(--text);
}
@media (max-width: 760px){
  .exp-head{ flex-direction: column; gap: 4px; }
  .exp-dates{ margin-left: 0; }
  .exp-role{ font-size: 21px; }
}