/* ---- Base & reset ---- */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue",
               Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji",
               "Segoe UI Emoji";
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  background-color: #0b1220; /* fallback if gradients are unsupported */
  background-image:
    radial-gradient(1200px 600px at 10% 10%, rgba(56,189,248,0.12), transparent 60%),
    radial-gradient(1000px 500px at 90% 30%, rgba(167,139,250,0.12), transparent 60%),
    radial-gradient(800px 400px at 50% 90%, rgba(34,197,94,0.10), transparent 60%);
  color: #e5e7eb;
}

:root {
  --card-bg: rgba(255,255,255,0.06);
  --card-border: rgba(255,255,255,0.18);
  --text: #e5e7eb;
  --muted: #cbd5e1;
  --brand: #0ea5e9;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

@media (prefers-color-scheme: light) {
  body {
    background-color: #f5f7fb;
    background-image:
      radial-gradient(1200px 600px at 10% 10%, rgba(14,165,233,0.12), transparent 60%),
      radial-gradient(1000px 500px at 90% 30%, rgba(99,102,241,0.10), transparent 60%),
      radial-gradient(800px 400px at 50% 90%, rgba(16,185,129,0.10), transparent 60%);
    color: #0f172a;
  }
  :root {
    --card-bg: rgba(255,255,255,0.85);
    --card-border: rgba(15,23,42,0.10);
    --text: #0f172a;
    --muted: #475569;
  }
}

/* ---- Layout ---- */
.page {
  min-height: 100%;
  display: grid;
  grid-template-rows: 1fr auto;
  place-items: center;
  gap: 2rem;
  padding: clamp(1.5rem, 3vw, 3rem);
}

.banner {
  width: min(92vw, 720px);
  padding: clamp(1.25rem, 2.5vw + 0.75rem, 3rem);
  text-align: center;
  background: linear-gradient(160deg, var(--card-bg), rgba(255,255,255,0.02));
  border: 1px solid var(--card-border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  backdrop-filter: saturate(120%) blur(3px);
  -webkit-backdrop-filter: saturate(120%) blur(3px);
  animation: pop 420ms cubic-bezier(.2,.9,.2,1.2);
}

.banner h1 {
  margin: 0 0 0.6rem;
  font-weight: 800;
  font-size: clamp(1.75rem, 5vw + 0.5rem, 3.5rem);
  letter-spacing: 0.01em;
}

/* Gradient headline */
.banner h1 strong {
  background: linear-gradient(90deg, #007cf0, #00dfd8, #ff0080, #ff8c00);
  background-size: 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientMove 6s infinite alternate ease-in-out;
}

.tagline {
  margin: 0 auto 1.25rem;
  max-width: 60ch;
  color: var(--muted);
  font-size: clamp(1rem, 1.3vw + 0.8rem, 1.125rem);
}

.actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.7rem 1rem;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--brand) 55%, #ffffff 45%);
  background: linear-gradient(180deg, color-mix(in srgb, var(--brand) 20%, #ffffff 80%), var(--brand));
  color: white;
  text-decoration: none;
  font-weight: 600;
  transition: transform 150ms ease, filter 150ms ease;
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.05); }
.btn:active { transform: translateY(0); filter: brightness(0.95); }

.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--card-border);
}

.foot {
  opacity: 0.8;
  font-size: 0.95rem;
}

/* ---- Animations ---- */
@keyframes pop {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes gradientMove {
  from { background-position: 0% center; }
  to   { background-position: 100% center; }
}

@media (prefers-reduced-motion: reduce) {
  .banner { animation: none; }
  .btn { transition: none; }
}

/* High contrast users */
@media (prefers-contrast: more) {
  .banner { border-color: #666; }
  .btn { border-color: #000; }
}

/* Print safe */
@media print {
  body { background: #fff; }
  .banner { box-shadow: none; }
}