/* ---------- Tokens (light = default) ---------- */
:root {
  --bg: #ffffff;
  --bg-alt: #f7f8fa;
  --bg-card: #ffffff;
  --border: #e5e7eb;
  --text: #111827;
  --text-muted: #4b5563;
  --text-dim: #9ca3af;
  --accent: #0d9488;
  --accent-soft: rgba(13, 148, 136, 0.10);
  --nav-bg: rgba(255, 255, 255, 0.78);
  --hover-bg: rgba(0, 0, 0, 0.02);
  --max: 760px;
  --max-wide: 980px;
  --radius: 8px;
  --transition: 180ms ease;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
}

[data-theme="dark"] {
  --bg: #0d1117;
  --bg-alt: #0a0e14;
  --bg-card: #131923;
  --border: #1f2730;
  --text: #e6edf3;
  --text-muted: #8b96a5;
  --text-dim: #5b6573;
  --accent: #7dd3c0;
  --accent-soft: rgba(125, 211, 192, 0.12);
  --nav-bg: rgba(13, 17, 23, 0.7);
  --hover-bg: rgba(255, 255, 255, 0.02);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  font-weight: 400;
  transition: background-color 250ms ease, color 250ms ease;
}

a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--text-dim);
  transition: border-color var(--transition), color var(--transition);
}
a:hover { border-bottom-color: var(--accent); color: var(--accent); }

ul { list-style: none; }

::selection { background: var(--accent-soft); color: var(--text); }

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: var(--nav-bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background-color 250ms ease;
}
.nav.scrolled { border-bottom-color: var(--border); }

.nav-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text);
  border: none;
  letter-spacing: 0.02em;
}
.nav-logo:hover { color: var(--accent); }
.nav-links {
  display: flex;
  gap: 28px;
}
.nav-links a {
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 400;
  border: none;
}
.nav-links a:hover { color: var(--text); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  line-height: 1;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.theme-icon { display: inline-block; transform: translateY(-1px); }

@media (max-width: 640px) {
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 0.82rem; }
  .nav-inner { padding: 14px 20px; }
  .theme-toggle { width: 28px; height: 28px; }
}

/* ---------- Hero ---------- */
.hero {
  min-height: 78vh;
  display: flex;
  align-items: center;
  padding: 140px 32px 80px;
}
.hero-inner {
  max-width: var(--max);
  margin: 0 auto;
  width: 100%;
}
.hero-name {
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: 24px;
}
.hero-tag {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  margin-bottom: 32px;
  max-width: 580px;
  line-height: 1.55;
}
.hl { color: var(--text); font-weight: 500; }

.hero-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}
.hero-meta a { color: var(--text-muted); border-bottom: 1px solid var(--border); }
.hero-meta a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.hero-meta .sep { color: var(--text-dim); }

/* ---------- Sections ---------- */
.section {
  padding: 90px 32px;
}
.section-alt { background: var(--bg-alt); }
.section-inner {
  max-width: var(--max);
  margin: 0 auto;
}
.section-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-dim);
  margin-bottom: 28px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.section-lede {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: -14px;
  margin-bottom: 36px;
}

/* ---------- Prose ---------- */
.prose p {
  color: var(--text-muted);
  margin-bottom: 18px;
  font-size: 1.02rem;
}
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--text); font-weight: 500; }
.prose em { color: var(--text); font-style: italic; }
.prose-meta {
  font-size: 0.92rem !important;
  color: var(--text-dim) !important;
  margin-top: 28px !important;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

/* ---------- Schools / Coursework (list style) ---------- */
.school + .school {
  margin-top: 48px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}

.course-list {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
}
.course {
  padding: 22px 0;
  border-top: 1px solid var(--border);
}
.course:first-child { border-top: none; padding-top: 8px; }
.course:last-child { padding-bottom: 8px; }

.course-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}
.course-code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  font-weight: 500;
}
.course-name {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
}
.course-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 8px;
}
.course-projects {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.65;
}
.course-projects-label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-right: 6px;
}

/* ---------- Project filters ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}
.filter {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.02em;
}
.filter:hover {
  color: var(--text);
  border-color: var(--text-dim);
}
.filter.is-active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.project {
  display: block;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 26px;
  transition: border-color var(--transition), background var(--transition);
}
.project:hover {
  border-color: var(--text-dim);
  background: var(--hover-bg);
}
.project.is-hidden { display: none; }

.project-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.project-cat {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.project-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  border-bottom: none;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.project-link:hover { color: var(--accent); }

.project h3 {
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  color: var(--text);
}
.project > p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 14px;
  line-height: 1.6;
}

.project-video {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: 0 0 16px 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #000;
}

.project-bullets {
  margin: 0 0 16px 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.project-bullets li {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.55;
  position: relative;
  padding-left: 18px;
}
.project-bullets li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--text-dim);
}
.project-bullets strong { color: var(--text); font-weight: 500; }

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-dim);
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.project-stack span::before {
  content: '#';
  opacity: 0.5;
  margin-right: 2px;
}

/* ---------- Footer ---------- */
.footer {
  padding: 36px 32px;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* ---------- Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 500ms ease, transform 500ms ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

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