:root {
  --bg: #ffffff;
  --text: #0b0f14;
  --muted: #6b7280;
  --card: #f7f8fa;
  --border: #e5e7eb;
  --primary: #2563eb;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  --container: 1100px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f14;
    --text: #e5e7eb;
    --muted: #9aa4b2;
    --card: #121821;
    --border: #1f2937;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  }
}

[data-theme="dark"] {
  --bg: #0b0f14;
  --text: #e5e7eb;
  --muted: #9aa4b2;
  --card: #121821;
  --border: #1f2937;
}

* {
  box-sizing: border-box;
}

html, body {
  padding: 0;
  margin: 0;
}

body {
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.container {
  width: 100%;
  max-width: var(--container);
  padding: 0 20px;
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(120%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.brand-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.brand-text {
  font-weight: 600;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: inherit;
  text-decoration: none;
  opacity: 0.9;
}

.site-nav a:hover {
  opacity: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--card);
  color: inherit;
  cursor: pointer;
}

.nav-toggle {
  display: none;
}

.hero {
  padding: 72px 0 24px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 6vw, 44px);
  line-height: 1.15;
}

.tagline {
  margin: 0 0 16px;
  color: var(--muted);
  max-width: 800px;
  font-size: clamp(14px, 2.6vw, 18px);
}

.hero-ctas {
  display: flex;
  gap: 12px;
}

.section {
  padding: 48px 0;
}

.bullets {
  margin: 10px 0 0;
}

.bullets li {
  margin: 6px 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 32px;
  align-items: center;
}

.about-avatar {
  width: 220px;
  height: 220px;
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.stat {
  padding: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stat-value {
  font-weight: 600;
}

.timeline {
  position: relative;
  margin-left: 14px;
}

.timeline:before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin: 0 0 24px 0;
}

.timeline-marker {
  position: absolute;
  left: -6px;
  top: 10px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
}

.timeline-content {
  margin-left: 18px;
  padding: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.timeline .meta {
  color: var(--muted);
  font-size: 14px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.card.project {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  padding: 14px;
}

.card-media {
  display: grid;
  place-items: center;
  font-size: 34px;
}

.card-body h3 {
  margin: 0 0 6px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 10px 0 0;
}

.tags span {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--card) 70%, transparent);
  font-size: 12px;
}

.card-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
}

.contact .card {
  padding: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-field {
  display: grid;
  gap: 6px;
}

label {
  font-weight: 500;
}

input, textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.form-status {
  margin-top: 10px;
  color: var(--muted);
  min-height: 20px;
}

.socials {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.socials a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.socials a:hover {
  border-bottom-color: var(--primary);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

.button.primary {
  background: var(--primary);
  color: white;
  border-color: color-mix(in srgb, var(--primary), black 20%);
}

.button.small {
  padding: 8px 12px;
  border-radius: 10px;
}

.site-footer {
  padding: 24px 20px 60px;
  color: var(--muted);
  text-align: center;
}

/* Fluid section headings */
.section h2 {
  font-size: clamp(20px, 4.2vw, 28px);
  line-height: 1.2;
}

@media (max-width: 960px) {
  .projects-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .about-avatar {
    width: 180px;
    height: 180px;
  }
}

@media (max-width: 720px) {
  .site-nav {
    position: fixed;
    inset: 60px 12px auto 12px;
    border: 1px solid var(--border);
    background: var(--card);
    border-radius: var(--radius);
    transform: translateY(-20px);
    opacity: 0;
    pointer-events: none;
    transition: 160ms ease;
  }
  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .about-avatar {
    width: 140px;
    height: 140px;
  }
  .hero-ctas {
    flex-wrap: wrap;
  }
  .card.project {
    grid-template-columns: 48px 1fr;
  }
}

@media (max-width: 480px) {
  .brand-text {
    display: none;
  }
  .container {
    padding: 0 14px;
  }
  .hero {
    padding: 56px 0 16px;
  }
  .card-actions {
    flex-wrap: wrap;
  }
}