:root{
  --bg:#0b0f17;
  --card:#0f172a;
  --text:#0f172a;
  --muted:#64748b;
  --paper:#ffffff;
  --line:#e2e8f0;
  --accent:#2563eb;
  --accent2:#0ea5e9;
}

*{ box-sizing:border-box; }

html{ scroll-behavior:smooth; }

body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background:#f6f7fb;
  color:#0f172a;
  line-height:1.6;
}

.container{
  width:min(1100px, 92%);
  margin:0 auto;
}

.topbar{
  position:sticky;
  top:0;
  z-index:10;
  background:rgba(246,247,251,0.9);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--line);
}

.topbar-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 0;
}

.brand{
  font-weight:700;
  text-decoration:none;
  color:#0f172a;
}

.nav a{
  text-decoration:none;
  color:#0f172a;
  margin-left:18px;
  font-weight:600;
  font-size:14px;
}

.nav a:hover{ color:var(--accent); }

.hero{
  background:linear-gradient(135deg, #0b0f17 0%, #111827 55%, #0b0f17 100%);
  color:#fff;
  padding:70px 0;
  border-bottom:1px solid rgba(226,232,240,0.15);
}

.hero-inner{
  display:grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap:28px;
  align-items:start;
}

.hero h1{
  margin:0 0 8px;
  font-size:34px;
  letter-spacing:0.2px;
}

.subtitle{
  margin:0 0 14px;
  color:rgba(255,255,255,0.78);
  font-weight:600;
}

.summary{
  margin:0 0 22px;
  color:rgba(255,255,255,0.85);
  max-width:60ch;
}

.card{
  background:rgba(255,255,255,0.06);
  border:1px solid rgba(226,232,240,0.18);
  border-radius:14px;
  padding:18px 18px 12px;
}

.card-title{
  font-weight:700;
  margin-bottom:10px;
}

.card-list{
  margin:0;
  padding-left:18px;
  color:rgba(255,255,255,0.85);
}

.section{
  padding:58px 0;
}

.section.alt{
  background:#ffffff;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}

h2{
  margin:0 0 8px;
  font-size:24px;
}

.section-subtitle{
  margin:0 0 22px;
  color:var(--muted);
  max-width:70ch;
}

.grid{
  display:grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap:18px;
}

.project{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:14px;
  padding:18px;
  box-shadow: 0 6px 18px rgba(15,23,42,0.06);
}

.project h3{
  margin:0 0 8px;
  font-size:18px;
}

.project p{
  margin:0 0 12px;
  color:#334155;
}

.tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-bottom:12px;
}

.tags span{
  font-size:12px;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  background:#f8fafc;
  color:#0f172a;
}

.link{
  display:inline-block;
  font-weight:700;
  text-decoration:none;
  color:var(--accent);
}

.link:hover{ text-decoration:underline; }

.skills{
  display:grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap:18px;
}

.skill-col{
  background:#f8fafc;
  border:1px solid var(--line);
  border-radius:14px;
  padding:18px;
}

.skill-col h4{
  margin:0 0 10px;
  font-size:16px;
}

.skill-col ul{
  margin:0;
  padding-left:18px;
  color:#334155;
}

.btn{
  display:inline-block;
  padding:10px 14px;
  border-radius:10px;
  text-decoration:none;
  font-weight:700;
  font-size:14px;
  border:1px solid transparent;
}

.cta-row{ display:flex; gap:10px; }

.btn.primary{
  background:var(--accent);
  color:#fff;
}

.btn.primary:hover{ background:#1d4ed8; }

.btn.ghost{
  background:transparent;
  color:#fff;
  border-color:rgba(226,232,240,0.35);
}

.section .btn.ghost{
  color:#0f172a;
  border-color:var(--line);
}

.btn.ghost:hover{
  border-color:var(--accent2);
  color:var(--accent2);
}

.contact-box{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top:10px;
}

.footer{
  padding:18px 0;
  color:#64748b;
}

.footer-inner{
  display:flex;
  justify-content:center;
  border-top:1px solid var(--line);
  padding-top:16px;
}

/* Responsive */
@media (max-width: 860px){
  .hero-inner{ grid-template-columns: 1fr; }
  .grid{ grid-template-columns: 1fr; }
  .skills{ grid-template-columns: 1fr; }
  .nav a{ margin-left:12px; }
}