/* Design tokens */
:root {
  --bg: #ffffff;
  --text: #0b1220;
  --muted: #5b6473;
  --primary: #2563eb;
  --primary-ink: #ffffff;
  --surface: #f5f7fb;
  --border: #e6e9ef;
  --accent: #22c55e;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
  --radius: 12px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --container: 1100px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f19;
    --text: #eef2f7;
    --muted: #9aa3b2;
    --primary: #60a5fa;
    --primary-ink: #0b0f19;
    --surface: #0f1629;
    --border: #1c243a;
    --accent: #34d399;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  }
}
[data-theme="light"] {
  --bg: #ffffff;
  --text: #0b1220;
  --muted: #5b6473;
  --primary: #2563eb;
  --primary-ink: #ffffff;
  --surface: #f5f7fb;
  --border: #e6e9ef;
  --accent: #22c55e;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
}
[data-theme="dark"] {
  --bg: #0b0f19;
  --text: #eef2f7;
  --muted: #9aa3b2;
  --primary: #60a5fa;
  --primary-ink: #0b0f19;
  --surface: #0f1629;
  --border: #1c243a;
  --accent: #34d399;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  position: static;
  width: auto;
  height: auto;
  padding: var(--space-2) var(--space-3);
  background: var(--primary);
  color: var(--primary-ink);
  border-radius: 6px;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header.scrolled {
  box-shadow: var(--shadow);
  background: color-mix(in oklab, var(--bg) 98%, transparent);
}
.nav {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
}
.brand {
  font-family: Sora, Inter, sans-serif;
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.5px;
}
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 8px;
}
.nav-menu {
  display: flex;
  gap: var(--space-4);
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav-menu a {
  text-decoration: none;
  color: var(--muted);
  padding: 10px 12px;
  border-radius: 8px;
  position: relative;
}
.nav-menu a:hover {
  color: var(--text);
  background: var(--surface);
}
.nav-menu a.active {
  color: var(--text);
}
.nav-menu a.active::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--primary);
}
.theme-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 999px;
}
.section {
  padding: var(--space-8) var(--space-4);
}
.section-title {
  font-family: Sora, Inter, sans-serif;
  font-weight: 700;
  font-size: 28px;
  margin: 0 0 var(--space-5);
}
.hero {
  padding-top: calc(var(--space-8) + 20px);
}
.hero-content {
  max-width: var(--container);
  margin: 0 auto;
  text-align: center;
}
.avatar {
  border-radius: 999px;
  width: 160px;
  height: 160px;
  object-fit: cover;
  box-shadow: var(--shadow);
  border: 4px solid var(--surface);
}
.hero-title {
  font-family: Sora, Inter, sans-serif;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.15;
  margin: var(--space-5) auto var(--space-3);
  max-width: 18ch;
}
.hero-subtitle {
  color: var(--muted);
  margin: 0 auto var(--space-5);
  max-width: 60ch;
}
.hero-cta {
  display: inline-flex;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 10px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border);
  color: var(--text);
  transition: transform 0.15s ease, background 0.2s ease, box-shadow 0.2s ease;
  box-shadow: none;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.btn.primary {
  background: var(--primary);
  color: var(--primary-ink);
  border-color: transparent;
}
.btn.ghost {
  background: var(--surface);
}
.btn.small {
  padding: 8px 12px;
  font-size: 14px;
}
.social {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
  opacity: 0.9;
}
/* Make monochrome icons visible in dark mode */
[data-theme="dark"] .icon {
  filter: invert(1) brightness(1.2) contrast(1.05);
}
.about, .skills, .experience, .projects, .contact {
  max-width: var(--container);
  margin: 0 auto;
}
.skills-categories {
  display: flex;
  flex-direction: column;
  gap: var(--space-7);
}
.skill-category {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.skill-category-title {
  font-family: Sora, Inter, sans-serif;
  font-weight: 600;
  font-size: 20px;
  color: var(--text);
  margin: 0;
}
.logo-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
  align-items: center;
  justify-items: center;
}
@media (min-width: 480px) {
  .logo-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
@media (min-width: 720px) {
  .logo-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--muted);
  font-weight: 600;
  font-size: 14px;
}
.logo img {
  display: block;
  width: 56px;
  height: 56px;
}
.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 2px solid var(--border);
}
.timeline-item {
  position: relative;
  padding-left: var(--space-5);
  margin-bottom: var(--space-6);
}
.timeline-dot {
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: var(--shadow);
}
.bullets {
  padding-left: 18px;
  color: var(--muted);
}
.grid.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 720px) {
  .grid.cards {
    grid-template-columns: repeat(3, 1fr);
  }
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: color-mix(in oklab, var(--primary) 30%, var(--border));
}
.card-title {
  margin: 0 0 var(--space-2);
  font-weight: 700;
}
.card-desc {
  margin: 0 0 var(--space-4);
  color: var(--muted);
}
.contact {
  text-align: center;
}
.contact-actions {
  display: inline-flex;
  gap: var(--space-3);
}
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-5) var(--space-4);
  text-align: center;
  color: var(--muted);
}
@media (max-width: 860px) {
  .nav-toggle { display: inline-block; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 60px;
    right: 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: var(--space-3);
    box-shadow: var(--shadow);
    min-width: 190px;
  }
  .nav-menu.open { display: flex; flex-direction: column; }
  .nav-menu a { padding: 12px 14px; }
}
@media (prefers-reduced-motion: no-preference) {
  .section { view-transition-name: section; }
  [data-animate="fade-up"] {
    opacity: 0;
    transform: translateY(6px);
    animation: fadeUp 500ms ease forwards;
  }
  @keyframes fadeUp {
    to { opacity: 1; transform: translateY(0); }
  }
}