:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --surface: rgba(255, 255, 255, 0.92);
  --surface-strong: #ffffff;
  --text: #172033;
  --muted: #5e6a7d;
  --line: #dce2ec;
  --brand: #ee334e;
  --brand-dark: #b81935;
  --accent: #ffcc36;
  --shadow: 0 18px 50px rgba(42, 54, 83, 0.12);
  font-family:
    Inter,
    "Hiragino Kaku Gothic ProN",
    "Yu Gothic",
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(
      circle at 12% 0%,
      rgba(255, 204, 54, 0.26),
      transparent 31rem
    ),
    radial-gradient(
      circle at 88% 12%,
      rgba(238, 51, 78, 0.18),
      transparent 34rem
    ),
    var(--bg);
  line-height: 1.75;
}

a {
  color: var(--brand-dark);
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-thickness: 2px;
}

.shell {
  width: min(100% - 32px, 920px);
  margin: 0 auto;
  padding: 40px 0 72px;
}

.hero,
.document,
.card {
  border: 1px solid rgba(220, 226, 236, 0.84);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 6vw, 56px);
}

.hero::after {
  position: absolute;
  width: 190px;
  height: 190px;
  right: -68px;
  bottom: -88px;
  border: 26px solid rgba(238, 51, 78, 0.12);
  border-radius: 50%;
  content: "";
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--brand-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.3;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 7vw, 4rem);
  letter-spacing: -0.04em;
}

h2 {
  margin: 2.25rem 0 0.75rem;
  font-size: clamp(1.28rem, 3vw, 1.65rem);
}

h3 {
  margin: 1.5rem 0 0.35rem;
  font-size: 1.05rem;
}

p,
ul {
  margin-top: 0.65rem;
}

li + li {
  margin-top: 0.35rem;
}

.lead {
  max-width: 650px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2.4vw, 1.15rem);
}

.actions,
.card-grid,
.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.actions {
  margin-top: 28px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: 1px solid var(--brand);
  border-radius: 999px;
  background: var(--brand);
  color: #ffffff;
  font-weight: 750;
  text-decoration: none;
}

.button.secondary {
  border-color: var(--line);
  background: var(--surface-strong);
  color: var(--text);
}

.card-grid {
  margin-top: 20px;
}

.card {
  flex: 1 1 250px;
  padding: 22px;
}

.card h2 {
  margin-top: 0;
}

.document {
  margin-top: 20px;
  padding: clamp(24px, 6vw, 52px);
}

.meta {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.lang-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
}

.lang-nav a {
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-strong);
  text-decoration: none;
}

.notice {
  margin: 20px 0;
  padding: 16px 18px;
  border-left: 4px solid var(--accent);
  border-radius: 4px 14px 14px 4px;
  background: rgba(255, 204, 54, 0.13);
}

.language-section + .language-section {
  margin-top: 48px;
  padding-top: 38px;
  border-top: 2px solid var(--line);
}

.footer {
  padding: 28px 8px 0;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

code {
  padding: 0.15em 0.4em;
  border-radius: 6px;
  background: rgba(94, 106, 125, 0.12);
  overflow-wrap: anywhere;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10131a;
    --surface: rgba(27, 32, 43, 0.94);
    --surface-strong: #232a38;
    --text: #f5f7fb;
    --muted: #b1bbca;
    --line: #3a4353;
    --brand: #ff4b64;
    --brand-dark: #ff8797;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  }
}

@media (max-width: 520px) {
  .shell {
    width: min(100% - 20px, 920px);
    padding-top: 18px;
  }

  .hero,
  .document,
  .card {
    border-radius: 18px;
  }
}