:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --line: #dbe2ea;
  --accent: #0f766e;
  --accent-hover: #115e59;
  --shadow: 0 18px 48px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background:
    radial-gradient(circle at top, rgba(15, 118, 110, 0.08), transparent 40%),
    linear-gradient(180deg, #f8fafc 0%, var(--bg) 100%);
  color: var(--text);
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  width: min(100%, 680px);
  padding: 48px 40px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow);
  text-align: center;
}

.eyebrow {
  margin: 0 0 16px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: clamp(2.5rem, 7vw, 4rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.subheading {
  margin: 16px 0 0;
  font-size: 1.2rem;
  color: var(--text);
}

.body {
  margin: 20px auto 0;
  max-width: 38rem;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--muted);
}

.button {
  display: inline-block;
  margin-top: 32px;
  padding: 14px 20px;
  border-radius: 999px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
  transition:
    background-color 160ms ease,
    transform 160ms ease;
}

.button:hover,
.button:focus-visible {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

@media (max-width: 640px) {
  .card {
    padding: 36px 24px;
    border-radius: 20px;
  }

  .subheading {
    font-size: 1.05rem;
  }
}