:root {
  --theme-bg: #ffffff;
  --theme-surface: #f8f9fa;
  --theme-text: #1a1a1a;
  --theme-textSecondary: #505050;
  --theme-primary: #0066cc;
  --theme-border: #c4c4c4;

  --radius-md: 12px;
  --radius-lg: 16px;
  --max-width: 920px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.5;
  background: var(--theme-bg);
  color: var(--theme-text);
}

a {
  color: var(--theme-primary);
  text-decoration: none;
}

a:hover {
  opacity: 0.85;
}

a:focus {
  outline: 3px solid var(--theme-primary);
  outline-offset: 2px;
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px 16px;
  background: var(--theme-surface);
}

.shell {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
}

.card {
  background: var(--theme-bg);
  border: 1px solid var(--theme-border);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.brand-logo {
  width: 40px;
  height: 40px;
  display: block;
}

.brand-name {
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 14px;
}

.hero-title {
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0 0 10px;
}

.hero-tagline {
  margin: 0 0 10px;
  color: var(--theme-textSecondary);
  font-size: 16px;
}

.hero-desc {
  margin: 0 0 18px;
  color: var(--theme-textSecondary);
  max-width: 70ch;
}

.bullets {
  margin: 0 0 18px 1.2rem;
  padding: 0;
  color: var(--theme-textSecondary);
}

.bullets li {
  margin-bottom: 0.4rem;
}

.notice {
  border: 1px solid var(--theme-border);
  border-radius: var(--radius-md);
  padding: 14px;
  background: var(--theme-surface);
}

.notice p {
  margin: 0;
}

.notice strong {
  font-weight: 700;
}

.footer {
  margin-top: 18px;
  font-size: 12px;
  color: var(--theme-textSecondary);
}

@media (min-width: 640px) {
  .card {
    padding: 34px 30px;
  }

  .brand-logo {
    width: 44px;
    height: 44px;
  }
}