:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fb;
  --text: #1a1d29;
  --text-muted: #5b6275;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --border: #e5e8f0;
  --radius: 12px;
  --max-width: 1100px;
  --shadow: 0 4px 16px rgba(20, 25, 50, 0.06);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent);
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* Hero */
.hero {
  padding: 80px 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 48px;
}

.eyebrow {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.hero-text h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 8px;
}

.hero-text .role {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.hero-text .lead {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin-bottom: 28px;
}

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

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background: var(--accent-dark);
}

.btn-outline {
  border-color: var(--border);
  color: var(--text);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-image img {
  border-radius: 24px;
  box-shadow: var(--shadow);
  width: 100%;
  object-fit: cover;
  aspect-ratio: 4/5;
}

/* Sections */
.section {
  padding: 70px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 36px;
}

.section-title-sub {
  margin-top: 56px;
}

/* About */
.about-content p {
  color: var(--text-muted);
  max-width: 760px;
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.contact-list {
  list-style: none;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  margin-top: 24px;
  font-weight: 500;
}

/* Timeline */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.timeline-logo {
  width: 64px;
  height: 64px;
  object-fit: contain;
  align-self: start;
}

.timeline-logo-placeholder {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  align-self: start;
}

.timeline-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.timeline-org {
  display: block;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
}

.timeline-date {
  display: block;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 12px;
}

.timeline-content ul {
  padding-left: 20px;
  color: var(--text-muted);
}

.timeline-content li {
  margin-bottom: 6px;
}

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

/* Education */
.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.education-card {
  display: flex;
  gap: 20px;
  align-items: center;
  padding: 24px;
}

.education-card img {
  width: 64px;
  height: 64px;
  object-fit: contain;
}

.edu-placeholder {
  background: var(--accent);
  color: #fff;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.education-card h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.gpa {
  font-weight: 600;
  margin-top: 4px;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.skill-card {
  padding: 22px;
}

.skill-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--accent);
}

.skill-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.publication-card {
  padding: 22px;
  color: var(--text-muted);
}

/* Awards */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.award-card {
  overflow: hidden;
}

.award-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.award-body {
  padding: 18px 20px;
}

.award-body h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.award-body p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.gallery-grid img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.2s ease;
}

.gallery-grid img:hover {
  transform: scale(1.02);
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: 8px;
}

.lightbox-close {
  position: absolute;
  top: 24px;
  right: 32px;
  color: #fff;
  font-size: 2.5rem;
  cursor: pointer;
  line-height: 1;
}

/* Footer */
.footer {
  background: var(--text);
  color: #fff;
  padding: 56px 0 24px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 32px;
}

.footer h2 {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.footer-inner p {
  color: #b8bdcc;
  max-width: 420px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #d6dbed;
  font-weight: 500;
}

.footer-links a:hover {
  color: #fff;
}

.copyright {
  text-align: center;
  color: #8b91a8;
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
}

/* Responsive */
@media (max-width: 860px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-image {
    order: -1;
    max-width: 320px;
    margin: 0 auto;
  }

  .nav-links {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 16px;
    display: none;
  }

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

  .nav-toggle {
    display: flex;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .hero-text h1 {
    font-size: 2.2rem;
  }
}