:root {
  --bg: #0d0d0f;
  --bg-elev: #16161a;
  --bg-card: #1b1b20;
  --border: #2a2a31;
  --text: #ececf1;
  --muted: #9a9aa6;
  --accent: #ff7a1a;
  --accent-soft: rgba(255, 122, 26, 0.12);
  --radius: 14px;
  --maxw: 1080px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

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

a { color: inherit; text-decoration: none; }

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

.accent { color: var(--accent); }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 13, 15, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.nav.scrolled { border-bottom-color: var(--border); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo { font-weight: 700; font-size: 1.15rem; letter-spacing: -0.02em; }
.logo span { color: var(--accent); }

.nav-links { display: flex; gap: 28px; }
.nav-links a { color: var(--muted); font-size: 0.95rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px 0;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 120px 0 110px;
}
.hero-inner { position: relative; z-index: 1; }

.eyebrow {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin: 0 0 12px;
}

.hero h1 {
  font-size: clamp(2.6rem, 8vw, 5rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
}

.tagline {
  max-width: 560px;
  color: var(--muted);
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  margin: 0 0 36px;
}

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

.hero-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 122, 26, 0.25), transparent 65%);
  filter: blur(40px);
  pointer-events: none;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s, background 0.2s, border-color 0.2s, color 0.2s;
}
.btn:hover { transform: translateY(-2px); }

.btn-primary { background: var(--accent); color: #111; }
.btn-primary:hover { background: #ff8f3f; }

.btn-ghost { border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Sections ---------- */
.section { padding: 80px 0; border-top: 1px solid var(--border); }

.section-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}
.section-sub { color: var(--muted); margin: 0 0 36px; }

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 48px;
  align-items: start;
  margin-top: 24px;
}
.about-text p { color: var(--muted); margin: 0 0 16px; font-size: 1.05rem; }

.interests {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.interests li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 600;
}
.icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--accent-soft);
  flex-shrink: 0;
}
.icon svg,
.contact-item svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Projects */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.card:hover,
.card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 10px 30px -12px rgba(255, 122, 26, 0.35);
}
.card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.card-tag {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
}
.card-arrow { color: var(--muted); font-size: 1.2rem; transition: color 0.2s, transform 0.2s; }
.card:hover .card-arrow { color: var(--accent); transform: translate(2px, -2px); }
.card h3 { margin: 0 0 8px; font-size: 1.2rem; }
.card p { margin: 0 0 20px; color: var(--muted); flex-grow: 1; }
.card-url { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.85rem; color: var(--muted); }

/* Contact */
.contact-links { display: flex; flex-wrap: wrap; gap: 14px; }
.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 500;
  transition: border-color 0.2s, color 0.2s;
}
.contact-item:hover { border-color: var(--accent); color: var(--accent); }

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}
.footer p { margin: 0; }

/* Focus */
a:focus-visible,
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* Reveal on scroll */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.js .reveal.visible { opacity: 1; transform: none; }

/* ---------- Mobile ---------- */
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  .nav-links.open { max-height: 240px; }
  .nav-links a { padding: 16px 20px; border-top: 1px solid var(--border); }

  .hero { padding: 80px 0 72px; }
  .hero-glow { width: 380px; height: 380px; right: -40%; }
  .section { padding: 60px 0; }
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
  .cards { grid-template-columns: 1fr; }
  .contact-item { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}