/* ===== Design tokens ===== */
:root {
  --bg: #0a0c0f;
  --bg-elevated: #111418;
  --bg-card: #161a20;
  --border: #252a33;
  --text: #e8eaed;
  --text-muted: #9aa0a6;
  --text-faint: #6b7280;
  --accent: #2dd4bf;          /* teal */
  --accent-dim: #14b8a6;
  --accent-soft: rgba(45, 212, 191, 0.12);
  --serif: "Instrument Serif", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, sans-serif;
  --radius: 12px;
  --max: 1100px;
  --nav-h: 72px;
}

/* ===== Reset & base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-align: justify;
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: #5eead4; }

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

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(10, 12, 15, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--serif);
  font-size: 1.35rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: 1.75rem;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: 0.25s;
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 3rem) 0 4rem;
  background:
    radial-gradient(ellipse 80% 50% at 70% 20%, rgba(45, 212, 191, 0.07), transparent),
    var(--bg);
}

.hero-content {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 4rem;
  align-items: center;
}

.eyebrow {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.6rem, 5vw, 3.75rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  color: var(--text);
}

.hero-lead {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 36ch;
  margin-bottom: 2rem;
  text-align: justify;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.4rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #042f2e;
}

.btn-primary:hover {
  background: #5eead4;
  color: #042f2e;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

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

.global-flags {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-faint);
}

.flags { font-size: 1.15rem; letter-spacing: 0.15em; }

.hero-photo {
  position: relative;
  justify-self: end;
}

.hero-photo img {
  width: min(100%, 380px);
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--border);
  box-shadow: 0 0 0 12px var(--accent-soft);
}

/* ===== Sections ===== */
.section {
  padding: 5.5rem 0;
}

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

.section-header {
  margin-bottom: 2.75rem;
}

.section-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.section-header h2 {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 3.5vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.02em;
}

/* ===== About ===== */
.about-text p {
  margin-bottom: 1.25rem;
  color: var(--text-muted);
  max-width: 65ch;
  text-align: justify;
}

.about-text p:last-child { margin-bottom: 0; }

.about-personal {
  font-style: italic;
  color: var(--text-faint) !important;
}

/* ===== Focus chips ===== */
.focus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.85rem;
}

.focus-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  transition: border-color 0.2s, background 0.2s;
}

.focus-item:hover {
  border-color: var(--accent-dim);
  background: var(--accent-soft);
}

/* ===== Timeline ===== */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 1.5rem;
  border-left: 2px solid var(--border);
}

.timeline-item {
  position: relative;
  padding: 1.35rem 0 1.35rem 1.75rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: 1.7rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
}

.timeline-meta {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.role {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
}

.org {
  color: var(--accent);
  font-size: 0.95rem;
}

.org a { color: inherit; }
.org a:hover { text-decoration: underline; }

.dates {
  font-size: 0.875rem;
  color: var(--text-faint);
}

.role-bullets {
  list-style: disc;
  padding-left: 1.2rem;
  margin-top: 0.75rem;
  color: var(--text-muted);
}

.role-bullets li {
  margin-bottom: 0.4rem;
  text-align: justify;
}

/* ===== Projects — full-card links ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.project-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
  color: inherit;
  text-decoration: none;
  height: 100%;
}

.project-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
  color: inherit;
}

.project-card h3 {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: 0.85rem;
  line-height: 1.35;
  color: var(--text);
}

.project-card:hover h3 {
  color: var(--accent);
}

.project-card p {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.6;
  text-align: justify;
  margin: 0;
}

/* ===== Skills ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
}

.skills-group h3 {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.skills-group ul {
  list-style: none;
}

.skills-group li {
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
  color: var(--text-muted);
  text-align: justify;
}

.skills-group li:last-child { border-bottom: none; }

.skills-group strong {
  color: var(--text);
  font-weight: 500;
}

/* ===== Education ===== */
.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.edu-block h3 {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.edu-item {
  margin-bottom: 1.75rem;
}

.edu-item:last-child { margin-bottom: 0; }

.degree {
  display: block;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.school {
  display: block;
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.note {
  display: block;
  font-size: 0.85rem;
  color: var(--text-faint);
  line-height: 1.5;
  text-align: justify;
}

.cert-list {
  list-style: none;
}

.cert-list li {
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
  color: var(--text-muted);
  text-align: justify;
}

.cert-list li:last-child { border-bottom: none; }

/* ===== Interests ===== */
.interests-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.interests-list span {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.55rem 1.15rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ===== Connect ===== */
.connect-section {
  text-align: center;
}

.connect-lead {
  color: var(--text-muted);
  max-width: 40ch;
  margin: 0 auto 2rem;
  font-size: 1.05rem;
  text-align: justify;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.85rem;
}

.social-btn {
  display: inline-flex;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.social-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

/* ===== Footer ===== */
.footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  font-size: 0.875rem;
  color: var(--text-faint);
}

.footer-note {
  margin-top: 0.35rem;
  font-size: 0.8rem !important;
}

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }

  .hero-lead { margin-inline: auto; }
  .hero-cta { justify-content: center; }
  .global-flags { justify-content: center; }
  .hero-photo { justify-self: center; }
  .hero-photo img { width: min(100%, 280px); }

  .edu-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 700px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1.25rem 1.5rem 1.5rem;
    gap: 1rem;
  }

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

  .nav-toggle { display: flex; }

  .nav-toggle.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

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

  .section { padding: 4rem 0; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2.35rem; }
  .btn { width: 100%; }
}