/* ---------- Design tokens ---------- */
:root {
  --bg: #0b0e14;
  --bg-alt: #10141d;
  --surface: #151a24;
  --surface-hover: #1b2130;
  --border: #262d3d;
  --text: #e7ebf3;
  --text-dim: #9aa4b8;
  --text-faint: #6b7488;
  --accent: #6ee7c9;
  --accent-strong: #34d399;
  --accent-soft: rgba(110, 231, 201, 0.12);
  --link: #7dd3fc;
  --radius: 14px;
  --max-width: 1080px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fa;
    --bg-alt: #ffffff;
    --surface: #ffffff;
    --surface-hover: #f0f2f6;
    --border: #e3e6ec;
    --text: #171a21;
    --text-dim: #545c6d;
    --text-faint: #8890a0;
    --accent: #0f9d70;
    --accent-strong: #0b7d59;
    --accent-soft: rgba(15, 157, 112, 0.1);
    --link: #0369a1;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

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

section { padding: 96px 0; }
section h2 { font-size: 1.9rem; margin: 0 0 8px; }
.section-kicker {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 12px;
}
.section-intro { color: var(--text-dim); max-width: 620px; margin: 0 0 48px; }

/* ---------- Nav ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--text);
}
.nav-brand:hover { text-decoration: none; }
.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a { color: var(--text-dim); font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 6px 10px;
  font-size: 1.1rem;
  cursor: pointer;
}

@media (max-width: 640px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 16px;
    display: none;
  }
  .nav-links.open { display: flex; }
}

/* ---------- Hero ---------- */
.hero {
  padding: 120px 0 80px;
  text-align: left;
}
.hero-eyebrow {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.9rem;
  margin: 0 0 18px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.1;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.hero h1 span { color: var(--accent); }
.hero p.lede {
  max-width: 640px;
  font-size: 1.15rem;
  color: var(--text-dim);
  margin: 0 0 36px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 44px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid var(--border);
  cursor: pointer;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--accent);
  color: #07130f;
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-strong); }
.btn-ghost { background: transparent; color: var(--text); }
.btn-ghost:hover { background: var(--surface-hover); }

.hero-meta {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  color: var(--text-faint);
  font-size: 0.9rem;
}
.hero-meta strong { color: var(--text); font-weight: 600; }

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.skill-card h3 {
  margin: 0 0 14px;
  font-size: 1rem;
  color: var(--accent);
}
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 5px 10px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--text);
  border: 1px solid var(--border);
}

/* ---------- Projects ---------- */
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}
.filter-btn {
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
}
.filter-btn:hover { color: var(--text); border-color: var(--accent); }
.filter-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #07130f;
  font-weight: 600;
}
.project-card[hidden] { display: none; }

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.project-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.project-card h3 { margin: 0; font-size: 1.15rem; }
.project-links { display: flex; gap: 10px; flex-shrink: 0; }
.project-links a {
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 8px;
  display: inline-flex;
}
.project-links a:hover { color: var(--text); background: var(--surface-hover); text-decoration: none; }
.project-links svg { width: 16px; height: 16px; }

.project-tagline {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin: 0 0 12px;
}
.project-card ul {
  margin: 0 0 18px;
  padding-left: 18px;
  color: var(--text-dim);
  font-size: 0.92rem;
}
.project-card li { margin-bottom: 6px; }
.project-card .tag-row { margin-top: auto; }

/* ---------- About ---------- */
.about-body { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; }
.about-body p { color: var(--text-dim); margin: 0 0 18px; }
.about-facts {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  align-self: start;
}
.about-facts dt { color: var(--text-faint); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; margin-top: 16px; }
.about-facts dt:first-child { margin-top: 0; }
.about-facts dd { margin: 4px 0 0; color: var(--text); }

@media (max-width: 760px) {
  .about-body { grid-template-columns: 1fr; }
}

/* ---------- Contact ---------- */
.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
}
.contact-card h2 { margin-top: 0; }
.contact-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text);
}
.contact-links a:hover { background: var(--surface-hover); text-decoration: none; border-color: var(--accent); }
.contact-links svg { width: 18px; height: 18px; }

footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-faint);
  font-size: 0.85rem;
}

/* ---------- Reveal on scroll ----------
   Content is visible by default so it never depends on JS running.
   Only when JS has actually run (html.js-enabled) do sections start
   hidden and fade in as they scroll into view. */
.js-enabled .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.js-enabled .reveal.in-view { opacity: 1; transform: translateY(0); }