/* ── Custom Properties ──────────────────────────────────────── */
:root {
  --bg: #08111f;
  --bg-soft: rgba(255,255,255,0.06);
  --panel: rgba(8, 17, 31, 0.72);
  --panel-strong: rgba(9, 14, 25, 0.9);
  --text: #ecf3ff;
  --muted: #a6b6d3;
  --line: rgba(255,255,255,0.12);
  --accent: #7cc7ff;
  --accent-2: #b07cff;
  --glow: 0 0 80px rgba(124, 199, 255, 0.18);
  --shadow: 0 20px 70px rgba(0,0,0,0.35);
  --max: 1180px;
  --radius: 22px;
}

/* ── Reset & Base ──────────────────────────────────────────── */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 20%, rgba(124,199,255,0.20), transparent 25%),
    radial-gradient(circle at 85% 15%, rgba(176,124,255,0.16), transparent 24%),
    radial-gradient(circle at 50% 85%, rgba(65,162,255,0.10), transparent 30%),
    linear-gradient(180deg, #0a1222 0%, #09111d 45%, #060b14 100%);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ── Header & Navigation ──────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(6, 11, 20, 0.72);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(124,199,255,0.25), rgba(176,124,255,0.22));
  border: 1px solid rgba(255,255,255,0.14);
  box-shadow: var(--glow);
  font-size: 0.96rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  padding: 10px 14px;
  border-radius: 999px;
  transition: 180ms ease;
  font-size: 0.96rem;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
  background: rgba(255,255,255,0.08);
  outline: none;
}

/* ── Main Layout ──────────────────────────────────────────── */
main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 36px 24px 96px;
}

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ── Page Header (subpages) ────────────────────────────────── */
.page-header {
  padding: 48px 42px 36px;
  position: relative;
}

.page-header::before {
  content: "";
  position: absolute;
  inset: -30% auto auto 60%;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, rgba(124,199,255,0.18), transparent 65%);
  pointer-events: none;
}

.page-title {
  margin: 0 0 12px;
  padding-bottom: 0.25em;
  font-size: clamp(2rem, 4vw, 3.2rem);
  color: #cfe4ff;
}

.page-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.75;
  max-width: 62ch;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  color: var(--muted);
  font-size: 0.92rem;
  transition: color 180ms ease;
}

.back-link:hover { color: var(--text); }

/* ── Hero (index) ──────────────────────────────────────────── */
.hero {
  display: grid;
  grid-template-columns: 1.25fr 0.9fr;
  gap: 28px;
  align-items: stretch;
  padding-top: 28px;
}

.hero-panel {
  padding: 42px;
  position: relative;
  overflow: hidden;
}

.hero-panel::before {
  content: "";
  position: absolute;
  inset: -30% auto auto 60%;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, rgba(124,199,255,0.18), transparent 65%);
  pointer-events: none;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.05);
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

h1 {
  margin: 22px 0 16px;
  font-size: clamp(2.8rem, 6vw, 5.6rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  max-width: 9ch;
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 0%, #cfe4ff 38%, #92d5ff 70%, #cda7ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

/* ── Buttons ───────────────────────────────────────────────── */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.13);
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(135deg, rgba(124,199,255,0.22), rgba(176,124,255,0.22));
  box-shadow: var(--glow);
}

.button-secondary {
  background: rgba(255,255,255,0.04);
  color: var(--text);
}

/* ── Stats Panel (index) ──────────────────────────────────── */
.stats-panel {
  padding: 28px;
  display: grid;
  gap: 16px;
  align-content: start;
}

.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.stat {
  padding: 18px;
  border-radius: 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
}

.stat .value {
  display: block;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  margin-bottom: 6px;
}

.stat .label {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

/* ── Sections ──────────────────────────────────────────────── */
.section {
  margin-top: 32px;
  padding: 32px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  margin-bottom: 22px;
}

.section-title {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  letter-spacing: -0.03em;
}

.section-copy {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.7;
  max-width: 64ch;
}

/* ── Projects ──────────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.project-card {
  padding: 28px;
  border-radius: 20px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.08);
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.tag {
  display: inline-flex;
  width: fit-content;
  padding: 7px 11px;
  border-radius: 999px;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
}

.project-card h3 {
  margin: 16px 0 10px;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.project-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.project-link {
  margin-top: 20px;
  color: var(--text);
  opacity: 0.92;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.project-links a {
  color: var(--text);
  opacity: 0.92;
}

/* ── About & Info Cards ────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 18px;
}

.info-card {
  padding: 24px;
  border-radius: 20px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.08);
}

.list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.list li {
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  color: var(--muted);
  line-height: 1.65;
}

.list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

/* ── Contact ───────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 18px;
  margin-top: 28px;
}

.contact-links {
  display: grid;
  gap: 14px;
}

.contact-link {
  padding: 18px 20px;
  border-radius: 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  transition: 180ms ease;
}

.contact-link:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.14);
}

.contact-label {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Experience ────────────────────────────────────────────── */
.experience-list {
  display: grid;
  gap: 24px;
  margin-top: 28px;
}

.experience-entry {
  padding: 32px;
  border-radius: 20px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.08);
}

.experience-entry a:not(.button) {
  color: var(--accent);
}

.experience-entry a:not(.button):hover {
  text-decoration: underline;
}

.experience-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: 14px;
}

.experience-role {
  margin: 0;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
}

.experience-org {
  color: var(--accent);
}

.experience-dates {
  color: var(--muted);
  font-size: 0.88rem;
  letter-spacing: 0.02em;
}

.experience-entry p {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.75;
  max-width: 72ch;
}

.experience-entry p:last-child { margin-bottom: 0; }

.section-divider {
  margin: 40px 0 8px;
  padding: 0 4px;
}

.section-divider h2 {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  letter-spacing: -0.03em;
}

/* ── Education ─────────────────────────────────────────────── */
.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.education-card {
  padding: 24px;
  border-radius: 20px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.08);
}

.education-card h3 {
  margin: 0 0 6px;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.education-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Publications ──────────────────────────────────────────── */
.pub-list {
  margin-top: 28px;
  display: grid;
  gap: 16px;
}

.pub-item {
  padding: 20px 24px;
  border-radius: 18px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--muted);
  line-height: 1.65;
}

.pub-item em { color: var(--text); font-style: normal; }

/* ── Resume Download ───────────────────────────────────────── */
.resume-download {
  text-align: center;
  margin-top: 48px;
  margin-bottom: 8px;
}

.resume-download a {
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
  opacity: 0.7;
  transition: opacity 180ms ease, color 180ms ease, text-decoration 180ms ease;
}

.resume-download a:hover {
  color: var(--text);
  text-decoration: underline;
  opacity: 1;
}

/* ── Footer ────────────────────────────────────────────────── */
footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px 36px;
  color: var(--muted);
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 980px) {
  .hero,
  .projects-grid,
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .section-header {
    align-items: start;
    flex-direction: column;
  }
}

@media (max-width: 720px) {
  .nav-wrap {
    min-height: auto;
    padding-top: 14px;
    padding-bottom: 14px;
    flex-direction: column;
    align-items: start;
  }

  .hero-panel,
  .section,
  .stats-panel {
    padding: 24px;
  }

  .page-header {
    padding: 28px 24px 24px;
  }

  h1 {
    max-width: 12ch;
  }

  .stat-grid {
    grid-template-columns: 1fr;
  }

  .experience-entry {
    padding: 24px;
  }

  .project-card {
    padding: 22px;
  }
}