/* ── CSS Variables ────────────────────────────────────────────────────────── */
:root {
  --bg:     #ffffff;
  --surface:#f5f4f2;
  --border: #e5e2de;
  --text:   #1a1816;
  --muted:  #7a7470;
  --accent: #a0782a;
  --mono:   'DM Mono', monospace;
  --serif:  'DM Serif Display', serif;
  --sans:   'DM Sans', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
}

/* Subtle grain overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1000;
  opacity: 0.4;
}

/* ── Nav ──────────────────────────────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 3rem;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
}

.nav-logo { font-family: var(--mono); font-size: 13px; color: var(--accent); letter-spacing: 0.08em; text-decoration: none; }
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a { font-family: var(--mono); font-size: 12px; color: var(--muted); text-decoration: none; letter-spacing: 0.06em; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }

/* ── Hero ─────────────────────────────────────────────────────────────────── */
.hero { min-height: 100vh; display: flex; align-items: center; padding: 8rem 3rem 4rem; position: relative; border-bottom: 1px solid var(--border); }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; max-width: 1100px; margin: 0 auto; width: 100%; }
.hero-left { display: flex; flex-direction: column; justify-content: center; }

.hero-tag { font-family: var(--mono); font-size: 11px; color: var(--accent); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 1.5rem; opacity: 0; animation: fadeUp 0.6s 0.1s forwards; }
.hero-name { font-family: var(--serif); font-size: clamp(3rem, 5vw, 5rem); line-height: 1.05; letter-spacing: -0.01em; margin-bottom: 1.5rem; opacity: 0; animation: fadeUp 0.6s 0.2s forwards; }
.hero-name em { font-style: italic; color: var(--accent); }
.hero-desc { font-size: 16px; color: var(--muted); line-height: 1.8; max-width: 480px; margin-bottom: 2.5rem; opacity: 0; animation: fadeUp 0.6s 0.3s forwards; }
.hero-links { display: flex; gap: 1rem; flex-wrap: wrap; opacity: 0; animation: fadeUp 0.6s 0.4s forwards; }

.btn { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; padding: 0.65rem 1.4rem; border-radius: 2px; text-decoration: none; transition: all 0.2s; display: inline-block; cursor: pointer; }
.btn-primary { background: var(--accent); color: #fff; font-weight: 500; border: none; }
.btn-primary:hover { background: #b8883a; }
.btn-ghost { border: 1px solid var(--border); color: var(--muted); background: transparent; }
.btn-ghost:hover { border-color: var(--muted); color: var(--text); }

.hero-right { display: flex; flex-direction: column; justify-content: center; gap: 1px; opacity: 0; animation: fadeIn 0.8s 0.5s forwards; }
.stat-row { display: flex; align-items: baseline; gap: 1rem; padding: 1.25rem 0; border-bottom: 1px solid var(--border); }
.stat-row:first-child { border-top: 1px solid var(--border); }
.stat-num { font-family: var(--serif); font-size: 2.5rem; color: var(--accent); min-width: 80px; line-height: 1; }
.stat-label { font-family: var(--mono); font-size: 12px; color: var(--muted); letter-spacing: 0.04em; line-height: 1.5; }

/* ── Sections ─────────────────────────────────────────────────────────────── */
section { max-width: 1100px; margin: 0 auto; padding: 6rem 3rem; border-bottom: 1px solid var(--border); }
.section-label { font-family: var(--mono); font-size: 11px; color: var(--accent); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 3rem; display: flex; align-items: center; gap: 1rem; }
.section-label::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.section-title { font-family: var(--serif); font-size: clamp(2rem, 3vw, 3rem); line-height: 1.1; margin-bottom: 1.5rem; }

/* ── Experience ───────────────────────────────────────────────────────────── */
.exp-list { display: flex; flex-direction: column; }
.exp-item { display: grid; grid-template-columns: 180px 1fr; gap: 2rem; padding: 2rem 0; border-bottom: 1px solid var(--border); }
.exp-item:last-child { border-bottom: none; }
.exp-meta { padding-top: 2px; }
.exp-date { font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: 0.04em; margin-bottom: 0.5rem; }
.exp-company { font-family: var(--mono); font-size: 12px; color: var(--accent); }
.exp-title { font-size: 17px; font-weight: 500; color: var(--text); margin-bottom: 0.5rem; line-height: 1.3; }
.exp-desc { font-size: 14px; color: var(--muted); line-height: 1.75; }
.exp-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 1rem; }
.tag { font-family: var(--mono); font-size: 10px; letter-spacing: 0.05em; padding: 3px 8px; border: 1px solid var(--border); color: var(--muted); border-radius: 1px; }

/* ── Patents ──────────────────────────────────────────────────────────────── */
.patent-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--border); }
.patent-card { background: var(--bg); padding: 2rem; transition: background 0.2s; }
.patent-card:hover { background: var(--surface); }
.patent-num { font-family: var(--mono); font-size: 11px; color: var(--accent); margin-bottom: 0.75rem; letter-spacing: 0.05em; }
.patent-title { font-size: 15px; font-weight: 500; margin-bottom: 0.5rem; line-height: 1.4; }
.patent-date { font-family: var(--mono); font-size: 11px; color: var(--muted); }

/* ── Skills ───────────────────────────────────────────────────────────────── */
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
.skill-group-title { font-family: var(--mono); font-size: 11px; color: var(--accent); letter-spacing: 0.08em; margin-bottom: 1rem; text-transform: uppercase; }
.skill-pills { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.skill-pill { font-family: var(--mono); font-size: 11px; padding: 5px 10px; background: var(--surface); border: 1px solid var(--border); color: var(--text); border-radius: 1px; }

/* ── Contact ──────────────────────────────────────────────────────────────── */
.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.contact-desc { font-size: 15px; color: var(--muted); line-height: 1.8; }
.contact-links { display: flex; flex-direction: column; gap: 1rem; }
.contact-link { display: flex; align-items: center; gap: 1rem; font-family: var(--mono); font-size: 13px; color: var(--muted); text-decoration: none; padding: 1rem; border: 1px solid var(--border); border-radius: 2px; transition: all 0.2s; }
.contact-link:hover { border-color: var(--accent); color: var(--text); }
.contact-link-label { font-size: 11px; color: var(--accent); letter-spacing: 0.06em; display: block; margin-bottom: 2px; text-transform: uppercase; }

/* ── Footer ───────────────────────────────────────────────────────────────── */
footer { text-align: center; padding: 2rem 3rem; font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: 0.06em; }

/* ── Animations ───────────────────────────────────────────────────────────── */
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  nav { padding: 1rem 1.5rem; }
  .nav-links { display: none; }
  .hero { padding: 7rem 1.5rem 3rem; }
  .hero-grid { grid-template-columns: 1fr; gap: 3rem; }
  section { padding: 4rem 1.5rem; }
  .exp-item { grid-template-columns: 1fr; gap: 0.5rem; }
  .patent-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .contact-wrap { grid-template-columns: 1fr; gap: 2rem; }
}