/* ====== Design tokens ====== */
:root{
  --w: 960px;
  --accent: #0a66c2;
  --text: #1b1b1b;
  --muted:#666;
  --bg:#ffffff;
  --soft:#e9eef3;
  --hero-from:#f6f8fb;
  --hero-to:#ffffff;
  --shadow-sm: 0 2px 5px rgba(0,0,0,.04);
  --shadow-md: 0 8px 24px rgba(0,0,0,.08);
}

/* ====== Base ====== */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  /* Uses Inter if you add the <link> in your HTML; falls back cleanly */
  font:16px/1.65 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  background:var(--bg);
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}

/* ====== Layout ====== */
.container{max-width:var(--w);margin:0 auto;padding:24px}
/* Only apply big spacing to top-level sections, not inner cards */
.container > section { margin-top:64px; }

/* ====== Header / Nav ====== */
header{
  display:flex;align-items:center;gap:24px;flex-wrap:wrap;
  position:sticky;top:0;background:#fff;z-index:10;
  border-bottom:1px solid var(--soft);
  box-shadow: var(--shadow-sm);
}
.brand{font-weight:700;letter-spacing:.2px;color:var(--text)}
.nav{display:flex;gap:18px;flex-wrap:wrap}
.nav a{
  padding:10px 0;border-bottom:2px solid transparent
}
.nav a.active,.nav a:hover{border-color:var(--accent)}

/* ====== Hero ====== */
.hero{
  text-align:center;
  padding:96px 20px 72px;
  background: linear-gradient(180deg, var(--hero-from) 0%, var(--hero-to) 100%);
  border-radius:12px;
  box-shadow: var(--shadow-sm);
}
.hero h1{font-size:2.3rem;line-height:1.2;margin:.2em 0 .4em}
.hero p{max-width:680px;margin:0 auto 1.6em;color:#404040}
.cta .btn{margin:0 8px}

/* ====== Buttons ====== */
.btn{
  display:inline-block;
  padding:11px 18px;border-radius:10px;
  background:var(--accent);color:#fff;border:1px solid var(--accent);
  transition: transform .06s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn.ghost{
  background:transparent;color:var(--accent);border:1px solid var(--accent)
}

/* ====== Content grid (home) ====== */
.grid{
  display:grid;gap:24px;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr))
}
.grid article{
  background:#fff;border:1px solid var(--soft);border-radius:12px;padding:22px;
  box-shadow:var(--shadow-sm);
  transition:transform .15s ease, box-shadow .2s ease;
}
.grid article:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.grid h2{margin-top:0;margin-bottom:.4em}
.tags{color:var(--muted);font-size:.9em}

/* ====== Expertise cards ====== */
.cards{
  display:grid;
  gap:24px;
  grid-template-columns: repeat(auto-fill, minmax(280px,1fr));
}
.card{
  background:#fff;
  border:1px solid var(--soft);
  border-radius:12px;
  padding:22px;
  box-shadow: var(--shadow-sm);
  transition: transform .15s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover{
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}
.card h2{margin-top:0;margin-bottom:.4em}

/* ====== Projects list ====== */
.project{padding:18px 0;border-bottom:1px solid var(--soft)}
.project:last-child{border-bottom:0}

/* ====== Footer ====== */
.foot{
  margin-top:64px;border-top:1px solid var(--soft);
  color:var(--muted);background:#fafbfc
}

/* ====== Media helpers ====== */
img{max-width:100%;height:auto;border-radius:8px}