:root {
  --bg: #0c1118;
  --bg-elevated: #141c27;
  --bg-card: #1a2433;
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8edf4;
  --text-muted: #9aa8bc;
  --accent: #4a9eff;
  --accent-soft: rgba(74, 158, 255, 0.12);
  --accent-warm: #c9a227;
  --gradient-start: #1a3a5c;
  --gradient-end: #0c1118;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
  --container: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #7ab8ff;
}

.container {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(12, 17, 24, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.25rem;
  gap: 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  font-weight: 600;
}

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

.logo-mark {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--gradient-start), #2d5a87);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.logo-text {
  font-size: 1.05rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

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

.nav-cta {
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--accent-soft);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  border: none;
  background: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Hero */
.hero {
  position: relative;
  padding: 9rem 0 5rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(74, 158, 255, 0.15), transparent),
    radial-gradient(ellipse 50% 40% at 10% 80%, rgba(201, 162, 39, 0.08), transparent),
    linear-gradient(180deg, var(--gradient-start) 0%, var(--gradient-end) 70%);
  pointer-events: none;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, black 20%, transparent 90%);
}

.hero-content {
  position: relative;
}

.eyebrow {
  margin: 0 0 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0 0 1.25rem;
  max-width: 14ch;
  font-family: var(--font-serif);
  font-size: clamp(2.75rem, 6vw, 4.25rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero-lead {
  margin: 0 0 2rem;
  max-width: 52ch;
  font-size: 1.15rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease;
}

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

.btn-primary {
  background: var(--accent);
  color: #061018;
}

.btn-primary:hover {
  background: #7ab8ff;
  color: #061018;
}

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

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.btn-full {
  width: 100%;
  margin-top: 1.5rem;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hero-badges li::before {
  content: "◆";
  margin-right: 0.5rem;
  color: var(--accent-warm);
  font-size: 0.55rem;
  vertical-align: middle;
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-header h2,
.about-intro h2,
.contact-intro h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 400;
  line-height: 1.15;
}

.section-header p {
  margin: 0;
  max-width: 50ch;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* About */
.about {
  background: var(--bg-elevated);
  border-block: 1px solid var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-intro p {
  margin: 0 0 1rem;
  color: var(--text-muted);
}

.about-intro p strong {
  color: var(--text);
}

.about-card,
.honors-card,
.contact-card {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.about-card h3,
.honors-card h3,
.contact-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.25rem;
}

.role {
  margin: 0 0 1.5rem;
  color: var(--accent);
  font-size: 0.95rem;
}

.about-details {
  list-style: none;
  margin: 0;
  padding: 0;
}

.about-details li {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--border);
}

.about-details .label,
.contact-list .label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.service-card {
  padding: 1.75rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.service-card:hover {
  border-color: rgba(74, 158, 255, 0.35);
  transform: translateY(-2px);
}

.service-icon {
  margin-bottom: 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-warm);
}

.service-card h3 {
  margin: 0 0 0.65rem;
  font-size: 1.1rem;
}

.service-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* Experience */
.experience {
  background: var(--bg-elevated);
  border-block: 1px solid var(--border);
}

.timeline {
  display: grid;
  gap: 0;
  border-left: 2px solid var(--border);
  margin-left: 0.5rem;
}

.timeline-item {
  position: relative;
  padding: 0 0 2rem 2rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg-elevated);
}

.timeline-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin-bottom: 0.4rem;
  font-size: 0.85rem;
}

.timeline-meta time {
  color: var(--accent-warm);
  font-weight: 600;
}

.timeline-org {
  color: var(--text-muted);
}

.timeline-item h3 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
}

.timeline-item p {
  margin: 0;
  max-width: 65ch;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Qualifications */
.qualifications-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.skill-groups {
  display: grid;
  gap: 1.75rem;
}

.skill-group h3 {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.tag-list li {
  padding: 0.4rem 0.85rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--text);
}

.honors-card ul {
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.honors-card li + li {
  margin-top: 0.65rem;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  align-items: center;
}

.contact-intro p {
  margin: 0;
  max-width: 48ch;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.contact-list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
}

.contact-list li {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--border);
}

.contact-list li:first-child {
  border-top: none;
  padding-top: 0;
}

/* Footer */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-content p {
  margin: 0;
}

/* Mobile nav */
@media (max-width: 900px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid,
  .qualifications-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 4.25rem;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem;
    background: rgba(12, 17, 24, 0.98);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links li {
    border-top: 1px solid var(--border);
  }

  .nav-links a {
    display: block;
    padding: 0.9rem 0.5rem;
  }

  .nav-cta {
    text-align: center;
    margin-top: 0.5rem;
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero {
    padding-top: 7rem;
  }

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

  .footer-content {
    flex-direction: column;
  }
}