/* Clean light theme (matches index.html: container/card/buttons) */
:root{
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: rgba(15, 23, 42, 0.12);
  --accent: #2563eb;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }

body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);   /* LIGHT background */
  color: var(--text);
  line-height: 1.6;
}

.container{
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 18px 40px;
}

.header{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:18px;
  padding: 6px 2px 14px;
}

h1{
  margin:0;
  font-size: clamp(30px, 4vw, 40px);
  letter-spacing: -0.02em;
}

.subtitle{
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 18px 16px;
  box-shadow: 0 10px 25px rgba(15,23,42,0.06);
}

.card h2{
  margin: 0 0 10px;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.card p{
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

/* About paragraph: keep it readable */
.about{
  max-width: 70ch;
}

.grid{
  display:grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 14px;
}

@media (min-width: 860px){
  .grid{ grid-template-columns: 1fr 1fr; }
}

.buttons{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin: 10px 0 8px;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration:none;
  background: rgba(37,99,235,0.06);
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
  font-weight: 600;
  font-size: 14px;
}

.btn:hover{
  transform: translateY(-1px);
  border-color: rgba(37,99,235,0.40);
  background: rgba(37,99,235,0.10);
}

.btn.primary{
  border-color: rgba(37,99,235,0.55);
  background: rgba(37,99,235,0.14);
}

.btn:focus-visible{
  outline: 2px solid rgba(37,99,235,0.60);
  outline-offset: 3px;
}

.footer{
  margin-top: 16px;
  text-align:center;
  color: rgba(71,85,105,0.85);
  font-size: 13px;
}