:root {
  --bg: #fdfdfd;
  --fg: #0a0a0a;
  --muted: #666666;
  --border: #d9d9d9;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --max-width: 1100px;
}

[data-theme="dark"] {
  --bg: #0a0a0a;
  --fg: #fdfdfd;
  --muted: #999999;
  --border: #2a2a2a;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  line-height: 1.5;
  transition: background 0.3s ease, color 0.3s ease;
}

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

a { color: inherit; }

h1, h2, h3 { font-weight: 700; letter-spacing: -0.02em; margin: 0 0 0.5em; }
h2 { font-size: 2rem; }
h3 { font-size: 1.1rem; }

.section { padding: 96px 0; border-top: 1px solid var(--border); }

/* Nav */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; flex-wrap: wrap; gap: 8px 16px; }
.nav-logo { font-weight: 700; font-size: 1.1rem; text-decoration: none; }
.nav-links { display: flex; gap: 16px 24px; flex-wrap: wrap; }
.nav-links a { text-decoration: none; font-size: 0.95rem; position: relative; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -4px; width: 0; height: 1px;
  background: var(--fg); transition: width 0.2s ease;
}
.nav-links a:hover::after { width: 100%; }
.theme-toggle {
  background: none; border: 1px solid var(--border); border-radius: 999px;
  width: 36px; height: 36px; cursor: pointer; font-size: 1rem; color: var(--fg);
}

/* Buttons */
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 999px;
  text-decoration: none; font-size: 0.95rem; font-weight: 600;
  border: 1px solid var(--fg); transition: transform 0.15s ease, opacity 0.15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--fg); color: var(--bg); }
.btn-secondary { background: transparent; color: var(--fg); }

/* Hero */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; overflow: hidden; }
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; }
.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}
.hero-name { font-size: clamp(2.5rem, 8vw, 5rem); margin-bottom: 0.2em; }
.hero-role { font-size: clamp(1rem, 2.5vw, 1.3rem); color: var(--muted); margin-bottom: 0.4em; }
.hero-tagline {
    max-width: 520px;
    color: var(--muted);
    margin: 1.5em auto;
}
.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}
.scroll-indicator {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
  z-index: 1; font-size: 1.2rem; opacity: 0.6;
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 48px;
    align-items: center;
}
img.about-photo {
    max-width: 100%;
    display: none;
}
[data-theme="dark"] .about-photo.light { display: none; }
[data-theme="dark"] .about-photo.dark { display: block; }
[data-theme="light"] .about-photo.light { display: block; }
[data-theme="light"] .about-photo.dark { display: none; }
.stats { display: flex; gap: 32px; margin-top: 24px; }
.stat dt { font-size: 1.8rem; font-weight: 700; }
.stat dd { margin: 0; color: var(--muted); font-size: 0.9rem; }

/* Skills */
.skills-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 32px; margin-top: 32px; }
.tag-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.tag { border: 1px solid var(--border); border-radius: 999px; padding: 6px 14px; font-size: 0.85rem; }

/* Projects */
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; margin-top: 32px; }
.project-card { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.project-card img { width: 100%; height: 220px; object-fit: cover; display: block; }
.project-card-body { padding: 20px; }
.project-card h3 { margin-bottom: 0.3em; }
.project-card p { color: var(--muted); font-size: 0.95rem; }
.stack-tags { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 12px 0; }
.stack-tags li { font-size: 0.75rem; border: 1px solid var(--border); border-radius: 999px; padding: 3px 10px; }
.additional-work-heading { margin-top: 56px; }
.additional-work { list-style: none; padding: 0; margin: 16px 0 0; display: flex; flex-wrap: wrap; gap: 16px 32px; }
.additional-work li { font-size: 0.95rem; }

/* Contact */
.contact-content { text-align: center; }
.contact-links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 24px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 32px 0; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: var(--muted); }
.footer-links { display: flex; gap: 16px; }

/* Accessibility */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--fg); outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 8px;
  background: var(--fg);
  color: var(--bg);
  padding: 8px 16px;
  border-radius: 4px;
  z-index: 100;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 8px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 720px) {
  .about-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
}