:root {
  --bg: #050b14;
  --bg-soft: #081321;
  --panel: rgba(14, 28, 45, 0.78);
  --panel-strong: #0e1c2d;
  --text: #eef6ff;
  --muted: #9db0c4;
  --teal: #5eead4;
  --teal-strong: #2dd4bf;
  --gold: #e8bd73;
  --blue: #7dd3fc;
  --line: rgba(255, 255, 255, 0.12);
  --line-bright: rgba(94, 234, 212, 0.42);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 5%, rgba(45, 212, 191, 0.14), transparent 28rem),
    radial-gradient(circle at 92% 18%, rgba(232, 189, 115, 0.11), transparent 25rem),
    linear-gradient(rgba(125, 211, 252, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125, 211, 252, 0.025) 1px, transparent 1px),
    var(--bg);
  background-size: auto, auto, 56px 56px, 56px 56px, auto;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

a { color: var(--teal); }
a:hover { color: #99f6e4; }
img { max-width: 100%; }

.site-nav {
  background: rgba(5, 11, 20, 0.86) !important;
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.brand-mark {
  width: 11px;
  height: 11px;
  display: inline-block;
  flex: 0 0 auto;
  margin-right: 0.65rem;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--teal), var(--gold));
  box-shadow: 0 0 18px rgba(94, 234, 212, 0.7);
  transform: rotate(45deg);
}
.navbar-brand { color: var(--text) !important; font-weight: 800; letter-spacing: -0.02em; }
.brand-label { color: var(--muted); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.13em; text-transform: uppercase; }
.site-nav .nav-link {
  position: relative;
  color: var(--text) !important;
  padding: 0.55rem 0.78rem !important;
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.65;
  transition: color 0.2s ease, opacity 0.2s ease;
}
.site-nav .nav-link::after {
  content: "";
  position: absolute;
  right: 0.78rem;
  bottom: 0.25rem;
  left: 0.78rem;
  height: 2px;
  background: var(--teal);
  box-shadow: 0 0 10px var(--teal);
  transform: scaleX(0);
  transition: transform 0.22s ease;
}
.site-nav .nav-link:hover,
.site-nav .nav-link.active { color: var(--teal) !important; opacity: 1; }
.site-nav .nav-link:hover::after,
.site-nav .nav-link.active::after { transform: scaleX(1); }
.navbar-toggler { border-color: var(--line); }
.navbar-toggler:focus { box-shadow: 0 0 0 0.2rem rgba(94, 234, 212, 0.14); }
.navbar-toggler-icon { filter: invert(1); }

.page-hero { padding: 7rem 0 4.75rem; }
.page-hero.compact { padding-bottom: 3rem; }
.eyebrow {
  color: var(--teal);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.display-title {
  max-width: 980px;
  margin: 0;
  font-size: clamp(2.75rem, 7vw, 6rem);
  font-weight: 800;
  line-height: 0.96;
  letter-spacing: -0.058em;
}
.display-title .accent { color: var(--teal); }
.hero-copy {
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.16rem);
  line-height: 1.8;
}
.status-chip,
.tag {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.status-chip { gap: 0.55rem; padding: 0.55rem 0.9rem; color: var(--muted); font-size: 0.82rem; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 14px var(--teal); }
.tag { margin: 0.2rem 0.2rem 0.2rem 0; padding: 0.34rem 0.68rem; color: var(--teal); border-color: rgba(94, 234, 212, 0.3); font-size: 0.72rem; font-weight: 700; }

.glass-card,
.feature-card,
.project-card,
.paper-card,
.timeline-card,
.contact-card {
  border: 1px solid var(--line);
  border-radius: 1.35rem;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.068), rgba(255, 255, 255, 0.022));
  box-shadow: var(--shadow);
}
.feature-card,
.project-card,
.paper-card,
.timeline-card,
.contact-card { height: 100%; padding: 1.6rem; transition: transform 0.25s ease, border-color 0.25s ease; }
.feature-card:hover,
.project-card:hover,
.paper-card:hover,
.contact-card:hover { transform: translateY(-6px); border-color: var(--line-bright); }
.card-number { color: var(--teal); font-size: 1.9rem; font-weight: 850; line-height: 1; }
.card-icon {
  display: inline-grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border: 1px solid rgba(94, 234, 212, 0.28);
  border-radius: 0.9rem;
  color: var(--teal);
  background: rgba(94, 234, 212, 0.07);
  font-size: 1.25rem;
}
.muted { color: var(--muted) !important; }
.section-space { padding: 5rem 0; }
.section-heading { max-width: 760px; font-size: clamp(2rem, 4vw, 3.6rem); font-weight: 800; letter-spacing: -0.045em; }
.section-copy { max-width: 700px; color: var(--muted); line-height: 1.75; }

.btn-primary-future,
.btn-outline-future {
  border-radius: 0.8rem;
  padding: 0.78rem 1.1rem;
  font-weight: 800;
}
.btn-primary-future { border-color: var(--teal); color: #03211d; background: var(--teal); }
.btn-primary-future:hover { border-color: #99f6e4; color: #03211d; background: #99f6e4; transform: translateY(-2px); }
.btn-outline-future { border-color: var(--line); color: var(--text); background: rgba(255, 255, 255, 0.025); }
.btn-outline-future:hover { border-color: rgba(255, 255, 255, 0.34); color: var(--text); background: rgba(255, 255, 255, 0.08); transform: translateY(-2px); }

.profile-frame { position: relative; max-width: 410px; margin-inline: auto; padding: 1rem; overflow: hidden; }
.profile-frame::before {
  content: "";
  position: absolute;
  inset: -35%;
  background: conic-gradient(from 90deg, transparent, rgba(94, 234, 212, 0.42), transparent 34%, rgba(232, 189, 115, 0.3), transparent 70%);
  animation: orbit 12s linear infinite;
}
.profile-frame::after { content: ""; position: absolute; inset: 1rem; border-radius: 1.1rem; background: var(--panel-strong); }
.profile-frame img { position: relative; z-index: 1; width: 100%; aspect-ratio: 4 / 5; border-radius: 1.1rem; object-fit: cover; object-position: top center; filter: saturate(0.9) contrast(1.03); }
.profile-label { position: absolute; z-index: 2; right: 2rem; bottom: 2rem; left: 2rem; padding: 0.8rem 1rem; border: 1px solid var(--line); border-radius: 0.8rem; background: rgba(5, 11, 20, 0.84); backdrop-filter: blur(10px); }
@keyframes orbit { to { transform: rotate(360deg); } }

.stat { padding: 1.1rem; border-left: 2px solid var(--teal); background: rgba(94, 234, 212, 0.045); }
.stat strong { display: block; color: var(--gold); font-size: 1.35rem; }
.stat span { color: var(--muted); font-size: 0.76rem; letter-spacing: 0.07em; text-transform: uppercase; }
.skill-cloud { display: flex; flex-wrap: wrap; gap: 0.65rem; }
.skill-pill { padding: 0.68rem 0.84rem; border: 1px solid var(--line); border-radius: 0.75rem; color: var(--text); background: rgba(255,255,255,0.035); font-size: 0.86rem; font-weight: 650; }

.terminal { padding: 1.1rem; border: 1px solid var(--line); border-radius: 1rem; background: #030811; box-shadow: inset 0 0 40px rgba(94, 234, 212, 0.025); font-family: "SFMono-Regular", Consolas, monospace; }
.terminal-top { display: flex; gap: 0.42rem; margin-bottom: 1rem; }
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; background: #fb7185; }
.terminal-dot:nth-child(2) { background: var(--gold); }
.terminal-dot:nth-child(3) { background: var(--teal); }
.terminal-line { color: var(--muted); font-size: 0.86rem; line-height: 1.85; }
.terminal-line .prompt { color: var(--teal); }
.terminal-line .value { color: var(--gold); }

.project-visual { min-height: 180px; display: grid; place-items: center; margin: -1.6rem -1.6rem 1.4rem; overflow: hidden; border-bottom: 1px solid var(--line); border-radius: 1.35rem 1.35rem 0 0; background: radial-gradient(circle at 25% 25%, rgba(94,234,212,.22), transparent 38%), #0a1727; }
.project-visual img { width: 100%; height: 210px; object-fit: cover; opacity: 0.8; }
.project-glyph { font-size: 4rem; color: var(--teal); filter: drop-shadow(0 0 22px rgba(94,234,212,.38)); }

.timeline { position: relative; padding-left: 1.3rem; }
.timeline::before { content: ""; position: absolute; top: 0.5rem; bottom: 0.5rem; left: 0; width: 1px; background: linear-gradient(var(--teal), rgba(94,234,212,.08)); }
.timeline-card { position: relative; margin-bottom: 1.25rem; }
.timeline-card::before { content: ""; position: absolute; top: 1.9rem; left: -1.68rem; width: 11px; height: 11px; border: 2px solid var(--bg); border-radius: 50%; background: var(--teal); box-shadow: 0 0 16px var(--teal); }
.timeline-meta { color: var(--teal); font-size: 0.76rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }

.metric-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; margin: 1.2rem 0; }
.metric { padding: 0.8rem; border: 1px solid var(--line); border-radius: 0.8rem; background: rgba(0, 0, 0, 0.22); }
.metric strong { display: block; color: var(--gold); font-size: 1.15rem; }
.metric span { color: var(--muted); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; }
.integrity { padding: 1.5rem; border: 1px solid rgba(232, 189, 115, 0.2); border-left: 3px solid var(--gold); border-radius: 0.9rem; color: var(--muted); background: rgba(232, 189, 115, 0.065); }

.form-control,
.form-control:focus { color: var(--text); background: rgba(2, 8, 17, 0.72); }
.form-control { min-height: 56px; border-color: var(--line); border-radius: 0.8rem; }
.form-control:focus { border-color: var(--teal); box-shadow: 0 0 0 0.2rem rgba(94, 234, 212, 0.09); }
.form-control::placeholder { color: #718397; }
.form-label { color: var(--muted); font-size: 0.8rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.contact-link { display: flex; gap: 1rem; align-items: center; color: var(--text); text-decoration: none; }
.contact-link:hover { color: var(--teal); }

.cta-panel { position: relative; overflow: hidden; padding: clamp(2rem, 6vw, 4.5rem); border: 1px solid var(--line); border-radius: 1.6rem; background: linear-gradient(135deg, rgba(94,234,212,.1), rgba(232,189,115,.07)); }
.cta-panel::after { content: ""; position: absolute; top: -90px; right: -90px; width: 240px; height: 240px; border: 1px solid rgba(94,234,212,.2); border-radius: 50%; box-shadow: 0 0 80px rgba(94,234,212,.12); }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); }
.social-link { display: inline-grid; width: 42px; height: 42px; place-items: center; border: 1px solid var(--line); border-radius: 0.8rem; color: var(--text); text-decoration: none; }
.social-link:hover { border-color: var(--teal); color: var(--teal); transform: translateY(-2px); }

@media (max-width: 991.98px) {
  .page-hero { padding-top: 5rem; }
  .navbar-collapse { padding-top: 1rem; }
  .site-nav .nav-link { padding-inline: 0 !important; }
  .site-nav .nav-link::after { right: auto; left: 0; width: 2.2rem; }
}
@media (max-width: 575.98px) {
  .brand-label { display: none; }
  .page-hero { padding: 4rem 0 3rem; }
  .section-space { padding: 3.5rem 0; }
  .display-title { font-size: clamp(2.65rem, 15vw, 4.25rem); }
  .feature-card, .project-card, .paper-card, .timeline-card, .contact-card { padding: 1.25rem; }
  .project-visual { margin: -1.25rem -1.25rem 1.25rem; }
  .metric-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}


/* Accessibility and interaction polish */
::selection { color: #031311; background: var(--teal); }
.skip-link {
  position: fixed;
  z-index: 2000;
  top: -5rem;
  left: 1rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--teal);
  border-radius: 0.7rem;
  color: #03211d;
  background: var(--teal);
  font-weight: 800;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 1rem; color: #03211d; }
:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 4px;
}