/* Base variables */
:root {
  --bg: #0b0f14;
  --card: #111827;
  --muted: #94a3b8;
  --text: #e5e7eb;
  --accent: #38bdf8;
  --accent-2: #22c55e;
  --btn-text: #0b0f14;
}

/* Reset / base */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 800px at 20% 10%, #0f172a, var(--bg));
  display: grid;
  place-items: center;
  padding: 24px;
}

/* Layout */
.container {
  width: 100%;
  max-width: 760px;
  display: grid;
  gap: 24px;
}

header { text-align: center; }

h1 {
  margin: 0 0 8px;
  font-size: clamp(24px, 4vw, 36px);
  letter-spacing: -0.02em;
}

p.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 16px;
  padding: 20px;
  backdrop-filter: blur(6px);
}

.row { display: grid; gap: 12px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px 18px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  color: var(--btn-text);
  background: linear-gradient(90deg, var(--accent), #60a5fa);
  border: 1px solid rgba(148, 163, 184, 0.25);
  transition: transform .06s ease, box-shadow .2s ease, filter .2s ease;
  box-shadow: 0 10px 20px rgba(56, 189, 248, 0.15);
}

.btn.secondary {
  background: linear-gradient(90deg, var(--accent-2), #84cc16);
  box-shadow: 0 10px 20px rgba(34, 197, 94, 0.15);
}

.btn:hover { transform: translateY(-1px); filter: brightness(1.05); }
.btn:active { transform: translateY(0); }
.btn span { flex: 1; text-align: center; }

/* Text */
.desc {
  margin: 0;
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
}

.muted { color: var(--muted); font-size: 14px; }

footer { text-align: center; color: var(--muted); font-size: 12px; }

/* Responsive tweaks */
@media (max-width: 420px) {
  body { padding: 16px; }
  .container { gap: 16px; }
  .card { padding: 16px; }
  .btn { padding: 12px 14px; font-size: 15px; }
  .desc { font-size: 14px; }
  .muted { font-size: 13px; }
}

@media (min-width: 900px) {
  .container { max-width: 920px; }
  h1 { font-size: 40px; }
  .card { padding: 24px; }
  .btn { padding: 16px 20px; font-size: 16px; }
  .desc { font-size: 16px; }
}