:root {
  --bg: #0b0c10;
  --card: #121318;
  --text: #e8eaed;
  --muted: #a1a7b3;
  --primary: #4f8cff;
  --border: #22242b;
  --container: 1100px;
}
* { box-sizing: border-box; }
html, body { margin:0; padding:0; background:var(--bg); color:var(--text); font-family:system-ui, -apple-system, Segoe UI, Roboto, Apple SD Gothic Neo, Noto Sans KR, sans-serif; }
a { color: inherit; text-decoration: none; }
.container { width:100%; max-width:var(--container); margin:0 auto; padding:0 16px; }

.site-header { position: sticky; top:0; backdrop-filter:saturate(180%) blur(8px); background:rgba(11,12,16,.7); border-bottom:1px solid var(--border); z-index:50; }
.nav { display:flex; align-items:center; justify-content:space-between; height:56px; }
.brand { font-weight:800; letter-spacing:.2px; }
.menu-btn { display:inline-flex; background:transparent; border:1px solid var(--border); color:var(--text); padding:6px 10px; border-radius:10px; }
.menu { display:none; gap:16px; }
.menu a { color:var(--muted); }
.menu a:hover { color:var(--text); }

@media (min-width: 768px) {
  .menu-btn { display:none; }
  .menu { display:flex; }
}

.hero { padding:64px 0 24px; text-align:center; }
.hero h1 { font-size: clamp(28px, 4vw, 44px); margin:0 0 8px; }
.hero p { color:var(--muted); margin:0 0 20px; }
.cta-group { display:flex; gap:12px; justify-content:center; flex-wrap:wrap; }

.btn { display:inline-flex; align-items:center; justify-content:center; padding:10px 16px; border:1px solid var(--border); border-radius:12px; background:#161821; transition:transform .08s ease; }
.btn.primary { background:var(--primary); color:#fff; border-color:transparent; }
.btn:active { transform:translateY(1px); }
.section { padding:32px 0; }
.section h2 { font-size: clamp(22px, 3vw, 28px); margin:0 0 16px; }

.grid { display:grid; gap:16px; grid-template-columns:1fr; }
@media (min-width: 600px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 980px) { .grid { grid-template-columns: repeat(3, 1fr); } }

.card { background:var(--card); border:1px solid var(--border); border-radius:16px; padding:16px; }
.card h3 { margin:0 0 6px; font-size:18px; }
.card p { margin:0; color:var(--muted); }

.form { display:grid; gap:12px; max-width:520px; }
.form input, .form textarea {
  width:100%; padding:10px 12px; border-radius:12px; border:1px solid var(--border);
  background:#0f1117; color:#e8eaed;
}

.site-footer { border-top:1px solid var(--border); margin-top:32px; }
.site-footer .container { padding:16px; text-align:center; color:var(--muted); }

/* A11y & scroll niceties */
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
[id] { scroll-margin-top: 72px; }
.sr-only {
  position:absolute !important; width:1px; height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0); border:0;
}
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 6px;
}