/* ======================================================================
   CPS Lab — static, offline-friendly academic website template
   - No external fonts, no frameworks, no build steps.
   - Edit colors in :root and [data-theme="light"] blocks.
   ====================================================================== */

:root{
  --bg: #0b1020;
  --bg2: #0a0f1a;
  --panel: rgba(255,255,255,0.06);
  --panel2: rgba(255,255,255,0.10);
  --stroke: rgba(231,236,255,0.18);
  --stroke2: rgba(231,236,255,0.28);
  --text: #e7ecff;
  --muted: #aab2d5;
  --muted2:#8e97bd;
  --accent: #7c5cff;
  --accent2:#00d4ff;
  --accent3:#ff4d6d;
  --good:#34d399;
  --warn:#fbbf24;

  --shadow: 0 18px 48px rgba(0,0,0,0.45);
  --shadow2: 0 8px 24px rgba(0,0,0,0.35);

  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;

  --max: 1180px;
  --pad: 20px;

  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
}

html[data-theme="light"]{
  --bg: #f7f8ff;
  --bg2:#f2f3ff;
  --panel: rgba(10,15,26,0.05);
  --panel2: rgba(10,15,26,0.08);
  --stroke: rgba(10,15,26,0.12);
  --stroke2: rgba(10,15,26,0.18);
  --text: #0a0f1a;
  --muted: #3f4a6b;
  --muted2:#5a6488;

  --shadow: 0 18px 44px rgba(10,15,26,0.10);
  --shadow2: 0 8px 22px rgba(10,15,26,0.10);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--text);
  background: var(--bg);
  overflow-x:hidden;
}

/* Background: grid + soft gradients */
.bg{
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:-1;
  background:
    radial-gradient(1200px 700px at 15% 10%, rgba(0,212,255,0.12), transparent 60%),
    radial-gradient(900px 700px at 85% 15%, rgba(124,92,255,0.14), transparent 65%),
    radial-gradient(800px 700px at 55% 90%, rgba(255,77,109,0.11), transparent 60%),
    linear-gradient(180deg, var(--bg), var(--bg2));
}

.bg::after{
  content:"";
  position:absolute;
  inset:0;
  background:
    repeating-linear-gradient(0deg,
      rgba(231,236,255,0.06) 0px,
      rgba(231,236,255,0.06) 1px,
      transparent 1px,
      transparent 28px),
    repeating-linear-gradient(90deg,
      rgba(231,236,255,0.06) 0px,
      rgba(231,236,255,0.06) 1px,
      transparent 1px,
      transparent 28px);
  opacity: 0.35;
  mask-image: radial-gradient(900px 600px at 50% 10%, black 0%, transparent 65%);
}

/* Accessibility */
.skip-link{
  position:absolute;
  top:8px;
  left:8px;
  padding:10px 12px;
  border-radius:12px;
  background: var(--panel2);
  border:1px solid var(--stroke);
  color:var(--text);
  transform: translateY(-140%);
  transition: transform 180ms ease;
  z-index: 9999;
}
.skip-link:focus{transform: translateY(0)}

/* Layout helpers */
.wrap{max-width:var(--max); margin:0 auto; padding:0 var(--pad)}
.section{padding: 78px 0}
.section h2{
  margin:0 0 14px;
  font-size: clamp(24px, 2.2vw, 34px);
  letter-spacing:-0.02em;
}
.kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-bottom: 10px;
  color:var(--muted);
  font-weight:600;
  letter-spacing:0.04em;
  text-transform:uppercase;
  font-size: 12px;
}
.kicker .dot{
  width:8px; height:8px; border-radius:99px;
  background: linear-gradient(135deg, var(--accent2), var(--accent), var(--accent3));
  box-shadow: 0 0 0 5px rgba(124,92,255,0.16);
}

/* Header */
.header{
  position:sticky;
  top:0;
  z-index: 1000;
  backdrop-filter: blur(14px);
  background: rgba(11,16,32,0.55);
  border-bottom: 1px solid rgba(231,236,255,0.10);
}
html[data-theme="light"] .header{
  background: rgba(247,248,255,0.75);
  border-bottom: 1px solid rgba(10,15,26,0.10);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding: 14px 0;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  min-width: 220px;
  text-decoration:none;
  color:var(--text);
}
.brand img{
  width:40px; height:40px;
  border-radius: 14px;
  box-shadow: var(--shadow2);
}
.brand .title{
  display:flex;
  flex-direction:column;
  line-height:1.05;
}
.brand .title strong{font-size: 15px; letter-spacing: -0.01em}
.brand .title span{font-size: 12px; color:var(--muted); font-family:var(--mono)}

.nav{
  display:flex;
  align-items:center;
  gap: 10px;
}
.nav a{
  color:var(--muted);
  text-decoration:none;
  padding: 10px 10px;
  border-radius: 12px;
  font-weight:600;
  font-size: 13px;
  transition: 180ms ease;
}
.nav a:hover{color:var(--text); background: rgba(231,236,255,0.06)}
.nav a[aria-current="page"]{
  color: var(--text);
  background: rgba(124,92,255,0.18);
  border: 1px solid rgba(124,92,255,0.30);
}

.header-cta{
  display:flex;
  align-items:center;
  gap:10px;
  justify-content:flex-end;
  min-width: 220px;
}

.icon-btn{
  width: 42px;
  height: 42px;
  display:grid;
  place-items:center;
  border-radius: 14px;
  background: var(--panel);
  border:1px solid var(--stroke);
  color: var(--text);
  cursor:pointer;
  transition: transform 120ms ease, background 180ms ease, border-color 180ms ease;
}
.icon-btn:hover{transform: translateY(-1px); background: var(--panel2); border-color: var(--stroke2)}
.icon{
  width: 18px;
  height: 18px;
}

.menu-btn{display:none}

/* Hero */
.hero{
  padding: 70px 0 20px;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: stretch;
}
.hero-card{
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.05));
  border: 1px solid rgba(231,236,255,0.18);
  box-shadow: var(--shadow);
  overflow:hidden;
  position:relative;
}
.hero-card::before{
  content:"";
  position:absolute;
  inset:-20%;
  background:
    radial-gradient(800px 280px at 10% 15%, rgba(0,212,255,0.22), transparent 70%),
    radial-gradient(700px 320px at 90% 10%, rgba(124,92,255,0.25), transparent 72%),
    radial-gradient(640px 280px at 60% 110%, rgba(255,77,109,0.20), transparent 70%);
  filter: blur(12px);
}
.hero-content{
  position:relative;
  padding: 34px 34px 26px;
}
.hero h1{
  margin: 6px 0 12px;
  font-size: clamp(34px, 4vw, 54px);
  letter-spacing: -0.03em;
  line-height: 1.02;
}
.hero p{
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
  max-width: 56ch;
}
.hero .pill-row{
  display:flex;
  flex-wrap:wrap;
  gap: 10px;
  margin: 14px 0 18px;
}
.pill{
  display:inline-flex;
  align-items:center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(0,0,0,0.20);
  border: 1px solid rgba(231,236,255,0.16);
  backdrop-filter: blur(10px);
  font-size: 13px;
  color: var(--text);
}
html[data-theme="light"] .pill{
  background: rgba(255,255,255,0.60);
}
.pill b{font-family: var(--mono); font-size: 12px; color: var(--muted)}
.pill .chip{
  width:10px; height:10px; border-radius:99px;
  background: linear-gradient(135deg, var(--accent2), var(--accent), var(--accent3));
  box-shadow: 0 0 0 4px rgba(124,92,255,0.14);
}

.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap: 12px;
  margin-top: 14px;
}
.btn{
  display:inline-flex;
  align-items:center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: var(--panel);
  color: var(--text);
  text-decoration:none;
  font-weight:700;
  font-size: 14px;
  cursor:pointer;
  transition: transform 120ms ease, background 180ms ease, border-color 180ms ease;
}
.btn:hover{transform: translateY(-1px); background: var(--panel2); border-color: var(--stroke2)}
.btn.primary{
  border-color: rgba(124,92,255,0.42);
  background: linear-gradient(135deg, rgba(0,212,255,0.18), rgba(124,92,255,0.24), rgba(255,77,109,0.16));
}
.btn.primary:hover{border-color: rgba(124,92,255,0.70)}
.btn .kbd{
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--stroke);
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(0,0,0,0.18);
}
html[data-theme="light"] .btn .kbd{background: rgba(255,255,255,0.60)}
.hero-aside{
  display:flex;
  flex-direction:column;
  gap: 14px;
}
.panel{
  border-radius: var(--radius-xl);
  background: var(--panel);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow2);
  overflow:hidden;
}
.panel .panel-hd{
  padding: 16px 18px;
  border-bottom: 1px solid rgba(231,236,255,0.10);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
}
.panel .panel-hd h3{
  margin:0;
  font-size: 14px;
  letter-spacing: 0.01em;
}
.panel .panel-bd{
  padding: 16px 18px 18px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}
.mini-list{display:grid; gap: 12px; margin:0; padding:0; list-style:none}
.mini-list li{
  display:flex;
  gap: 10px;
  align-items:flex-start;
}
.badge{
  font-family: var(--mono);
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 999px;
  border:1px solid rgba(231,236,255,0.18);
  background: rgba(231,236,255,0.08);
  color: var(--text);
  flex: 0 0 auto;
}

/* Cards / grids */
.grid{
  display:grid;
  gap: 16px;
}
.grid.cols-3{grid-template-columns: repeat(3, minmax(0,1fr))}
.grid.cols-2{grid-template-columns: repeat(2, minmax(0,1fr))}
.card{
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow2);
  padding: 18px;
  position:relative;
  overflow:hidden;
}
.card::after{
  content:"";
  position:absolute;
  inset:-30%;
  background:
    radial-gradient(420px 240px at 20% 10%, rgba(0,212,255,0.14), transparent 62%),
    radial-gradient(420px 240px at 90% 0%, rgba(124,92,255,0.14), transparent 60%);
  opacity: 0;
  transition: opacity 240ms ease;
  pointer-events:none;
}
.card:hover::after{opacity:1}

.card h3{margin:0 0 8px; font-size: 16px; letter-spacing:-0.01em}
.card p{margin:0; color:var(--muted); line-height:1.6; font-size: 14px}
.card .meta{
  margin-top: 12px;
  display:flex;
  flex-wrap:wrap;
  gap: 8px;
}
.tag{
  display:inline-flex;
  align-items:center;
  gap: 8px;
  border-radius: 999px;
  border: 1px solid rgba(231,236,255,0.16);
  background: rgba(231,236,255,0.06);
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text);
}
.tag .pin{
  width:8px; height:8px; border-radius:99px;
  background: linear-gradient(135deg, var(--accent2), var(--accent), var(--accent3));
}

/* Featured project */
.feature{
  display:grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 16px;
  align-items: stretch;
}
.figure{
  border-radius: var(--radius-xl);
  background: var(--panel);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow2);
  overflow:hidden;
}
.figure img{display:block; width:100%; height:auto}
.figure figcaption{
  padding: 14px 16px 18px;
  border-top: 1px solid rgba(231,236,255,0.10);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

/* Publications */
.pub-tools{
  display:flex;
  flex-wrap:wrap;
  gap: 10px;
  align-items:center;
  margin: 18px 0 14px;
}
.input{
  flex: 1 1 240px;
  min-width: 220px;
  display:flex;
  align-items:center;
  gap: 10px;
  padding: 12px 12px;
  border-radius: 14px;
  background: var(--panel);
  border: 1px solid var(--stroke);
}
.input input{
  width:100%;
  border:0;
  outline:0;
  background: transparent;
  color: var(--text);
  font-size: 14px;
}
.chips{display:flex; flex-wrap:wrap; gap: 8px}
.chipbtn{
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: var(--panel);
  color: var(--muted);
  cursor:pointer;
  font-weight:700;
  font-size: 12px;
  transition: 180ms ease;
}
.chipbtn[aria-pressed="true"]{
  color: var(--text);
  background: rgba(124,92,255,0.18);
  border-color: rgba(124,92,255,0.40);
}
.pub-list{
  display:grid;
  gap: 12px;
}
.pub{
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow2);
  padding: 16px;
}
.pub .top{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap: 14px;
}
.pub h3{
  margin:0 0 6px;
  font-size: 15px;
  letter-spacing: -0.01em;
}
.pub .byline{
  margin:0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}
.pub .venue{
  margin: 8px 0 0;
  color: var(--muted2);
  font-family: var(--mono);
  font-size: 12px;
}
.pub .links{
  display:flex;
  flex-wrap:wrap;
  gap: 8px;
  margin-top: 12px;
}
.small-link{
  display:inline-flex;
  align-items:center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(231,236,255,0.16);
  background: rgba(231,236,255,0.06);
  color: var(--text);
  text-decoration:none;
  font-weight:700;
  font-size: 12px;
}
.small-link:hover{background: rgba(231,236,255,0.10)}
details.bib{
  margin-top: 10px;
  border-top: 1px dashed rgba(231,236,255,0.18);
  padding-top: 10px;
}
details.bib summary{
  cursor:pointer;
  color: var(--muted);
  font-weight:700;
  font-size: 12px;
  list-style:none;
}
details.bib summary::-webkit-details-marker{display:none}
details.bib pre{
  margin: 10px 0 0;
  padding: 12px;
  border-radius: 14px;
  background: rgba(0,0,0,0.22);
  border: 1px solid rgba(231,236,255,0.14);
  overflow:auto;
  color: var(--text);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
}
html[data-theme="light"] details.bib pre{background: rgba(10,15,26,0.05)}

/* People */
.people-grid{
  display:grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}
.person{
  grid-column: span 4;
  display:flex;
  gap: 12px;
  padding: 16px;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow2);
}
.person img{
  width: 68px;
  height: 68px;
  border-radius: 18px;
  border: 1px solid rgba(231,236,255,0.18);
  flex: 0 0 auto;
  object-fit: cover;
}
.person .info{min-width:0}
.person h3{margin:0 0 4px; font-size: 14px}
.person p{margin:0; color: var(--muted); font-size: 13px; line-height: 1.45}
.person .links{margin-top: 8px; display:flex; gap: 8px; flex-wrap:wrap}
.person .links a{
  color: var(--text);
  text-decoration:none;
  font-size: 12px;
  padding: 6px 9px;
  border-radius: 999px;
  border: 1px solid rgba(231,236,255,0.16);
  background: rgba(231,236,255,0.06);
}
.person .links a:hover{background: rgba(231,236,255,0.10)}

/* News */
.news{
  display:grid;
  gap: 10px;
}
.news-item{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap: 14px;
  padding: 14px 16px;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow2);
}
.news-item time{
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted2);
  flex: 0 0 auto;
}
.news-item p{
  margin:0;
  color: var(--muted);
  line-height: 1.55;
  font-size: 14px;
}

/* Contact */
.contact-grid{
  display:grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
}
.list{
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  display:grid;
  gap: 10px;
}
.list li{
  display:flex;
  gap: 10px;
  align-items:flex-start;
  color: var(--muted);
}
.list b{color: var(--text); font-weight: 800}
.code{
  font-family: var(--mono);
  font-size: 12px;
  border: 1px solid rgba(231,236,255,0.16);
  background: rgba(231,236,255,0.06);
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--text);
  display:inline-flex;
  align-items:center;
  gap: 8px;
}
.toast{
  position:fixed;
  left:50%;
  bottom: 22px;
  transform: translateX(-50%);
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(0,0,0,0.6);
  border:1px solid rgba(231,236,255,0.18);
  color: var(--text);
  font-weight:700;
  font-size: 13px;
  opacity:0;
  pointer-events:none;
  transition: opacity 220ms ease, transform 220ms ease;
}
html[data-theme="light"] .toast{background: rgba(10,15,26,0.70)}
.toast.show{opacity:1; transform: translateX(-50%) translateY(-6px)}

/* Footer */
.footer{
  padding: 40px 0;
  border-top: 1px solid rgba(231,236,255,0.10);
  color: var(--muted);
  font-size: 13px;
}
.footer a{color: var(--text); text-decoration:none}
.footer a:hover{text-decoration:underline}

/* Small screens */
@media (max-width: 980px){
  .hero-grid{grid-template-columns: 1fr}
  .feature{grid-template-columns: 1fr}
  .contact-grid{grid-template-columns: 1fr}
  .grid.cols-3{grid-template-columns: repeat(2, minmax(0,1fr))}
  .person{grid-column: span 6}
}
@media (max-width: 720px){
  .wrap{padding: 0 16px}
  .section{padding: 62px 0}
  .brand{min-width: unset}
  .header-cta{min-width: unset}
  .nav{
    position:fixed;
    left: 16px;
    right: 16px;
    top: 72px;
    padding: 14px;
    border-radius: 18px;
    background: rgba(11,16,32,0.85);
    border: 1px solid rgba(231,236,255,0.18);
    box-shadow: var(--shadow);
    display:none;
    flex-direction:column;
    align-items:stretch;
  }
  html[data-theme="light"] .nav{background: rgba(247,248,255,0.92)}
  .nav a{padding: 12px 12px}
  .nav.open{display:flex}
  .menu-btn{display:grid}
  .grid.cols-3{grid-template-columns: 1fr}
  .grid.cols-2{grid-template-columns: 1fr}
  .people-grid{grid-template-columns: 1fr}
  .person{grid-column: unset}
}

/* Motion preferences */
@media (prefers-reduced-motion: reduce){
  *{scroll-behavior:auto !important; transition:none !important; animation:none !important}
}