:root {
  color-scheme: light;
  --background: #f5f7f8;
  --surface: #ffffff;
  --text: #111820;
  --muted: #5d6975;
  --border: #dfe5e8;
  --accent: #0b6bcb;
  --accent-hover: #075aa9;
  --shadow: 0 18px 55px rgba(17, 24, 32, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 20%, rgba(11, 107, 203, 0.12), transparent 30%),
    linear-gradient(135deg, #f5f7f8 0%, #edf2f5 100%);
}

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px;
}

.panel {
  width: min(100%, 560px);
  padding: 40px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.mark {
  margin: 0 0 28px;
  font-size: 15px;
  line-height: 1.2;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: 36px;
  line-height: 1.08;
  font-weight: 760;
  letter-spacing: 0;
}

.lede {
  margin: 18px 0 0;
  font-size: 17px;
  line-height: 1.58;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button,
.secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 7px;
  font-size: 15px;
  font-weight: 650;
  line-height: 1;
  text-decoration: none;
}

.button {
  color: #ffffff;
  background: var(--accent);
}

.button:hover {
  background: var(--accent-hover);
}

.secondary {
  color: var(--text);
  border: 1px solid var(--border);
  background: #f9fbfc;
}

.note {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

@media (max-width: 560px) {
  .shell {
    padding: 18px;
  }

  .panel {
    padding: 28px;
  }

  h1 {
    font-size: 30px;
  }

  .actions {
    flex-direction: column;
  }

  .button,
  .secondary {
    width: 100%;
  }
}