:root {
  --bg: #071124;
  --bg-soft: #0f1f3a;
  --surface: rgba(255, 255, 255, 0.05);
  --surface-strong: rgba(255, 255, 255, 0.09);
  --text: #eaf1ff;
  --muted: #b8c6ea;
  --primary: #4da3ff;
  --primary-strong: #1f7ae0;
  --border: rgba(166, 192, 255, 0.28);
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 15% 10%, #17325f 0%, var(--bg) 45%, #040a14 100%);
  line-height: 1.6;
}

a {
  color: #95c7ff;
}

a:hover {
  color: #c7e3ff;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(5, 12, 26, 0.75);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.brand {
  font-weight: 800;
  text-decoration: none;
  color: var(--text);
}

.menu-toggle {
  display: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  padding: 6px 10px;
  font-size: 1.1rem;
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 18px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--text);
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  padding: 40px 0 8px;
}

.eyebrow {
  margin: 0;
  color: #9ec8ff;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
}

.hero h1 {
  margin: 12px 0 12px;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  line-height: 1.32;
  font-weight: 650;
}

.lead {
  color: var(--muted);
  max-width: 65ch;
}

.lead-tag {
  font-weight: 800;
  letter-spacing: 0.01em;
}

.lead-tag--internship {
  color: #73c3ff;
  text-shadow: 0 0 14px rgba(77, 163, 255, 0.32);
}

.lead-tag--phd {
  color: #9fd8ff;
  text-shadow: 0 0 14px rgba(159, 216, 255, 0.28);
}

.hero-note {
  margin: 14px 0 0;
  color: #c1d1ef;
  font-size: 0.95rem;
  max-width: 68ch;
}

.hero-actions {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 10px 16px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: white;
}

.btn-secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.quick-metrics {
  list-style: none;
  padding: 0;
  margin: 22px 0 0;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  color: var(--muted);
}

.quick-metrics strong {
  color: var(--text);
}

.hero-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  text-align: center;
  gap: 2px;
  padding: 18px 16px 14px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(166, 192, 255, 0.2);
  box-shadow: none;
}

.hero-card img {
  width: min(100%, 255px);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
  border-radius: 12px;
  margin: 0 auto 10px;
}

.profile-name {
  margin: 0 0 3px;
  font-size: 1.02rem;
  font-weight: 700;
  color: #e3eeff;
}

.hero-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.2;
}

.hero-card p:not(.profile-name) {
  font-size: 0.84rem;
}

.section {
  padding: 36px 0 12px;
}

.section h2 {
  margin-top: 0;
  font-size: 1.6rem;
}

.positioning-note {
  margin: 0 0 14px;
  padding: 8px 12px;
  border-left: 2px solid rgba(120, 188, 255, 0.55);
  border-radius: 6px;
  background: rgba(77, 163, 255, 0.06);
  color: #c9daf8;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.chip-list span {
  border: 1px solid var(--border);
  background: rgba(77, 163, 255, 0.1);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 0.86rem;
}

.project-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 16px;
}

.project-card {
  padding: 0;
  overflow: hidden;
}

.project-card img {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.card-content {
  padding: 14px 16px 16px;
}

.card-content h3 {
  margin-top: 0;
}

.card-content ul,
.compact-list {
  margin: 10px 0;
  padding-left: 18px;
}

.inline-links {
  display: flex;
  gap: 12px;
  font-weight: 700;
}

.meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.timeline {
  display: grid;
  gap: 14px;
}

.timeline-item {
  border-left: 3px solid var(--primary);
  padding: 10px 14px;
  background: var(--surface);
  border-radius: 12px;
}

.timeline-item h3 {
  margin: 0 0 4px;
}

.timeline-item p {
  margin: 0;
}

.contact {
  text-align: center;
  padding-bottom: 56px;
}

.contact-links {
  margin-top: 14px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}

.contact-links a {
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  color: var(--text);
  background: var(--surface-strong);
}

.footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding: 14px 0 30px;
  text-align: center;
}

@media (max-width: 900px) {
  .hero,
  .two-col {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    left: 0;
    right: 0;
    top: 72px;
    background: rgba(5, 12, 26, 0.95);
    border-bottom: 1px solid var(--border);
    display: none;
    flex-direction: column;
    padding: 14px 20px;
  }

  .nav-links.open {
    display: flex;
  }
}