:root {
  color-scheme: light dark;
  --background: #f7f7fb;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: #ffffff;
  --text: #17151f;
  --secondary: #5f5a6f;
  --line: rgba(40, 32, 64, 0.11);
  --violet: #6246e5;
  --blue: #3d6de7;
  --mint: #18aaa0;
  --coral: #ea6674;
  --shadow: 0 18px 50px rgba(39, 29, 78, 0.1);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 7% 2%, rgba(98, 70, 229, 0.17), transparent 34rem),
    radial-gradient(circle at 93% 18%, rgba(24, 170, 160, 0.13), transparent 30rem),
    var(--background);
  line-height: 1.58;
}

a {
  color: var(--violet);
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 0.14em;
}

.site-header,
.page,
.site-footer {
  width: min(100% - 2rem, 880px);
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.35rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  width: 2.25rem;
  height: 2.25rem;
  border: 0.22rem solid rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  background: linear-gradient(135deg, var(--violet), var(--blue) 48%, var(--mint));
  box-shadow: 0 5px 16px rgba(77, 61, 195, 0.28);
}

.language-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem;
  font-size: 0.88rem;
}

.language-nav a {
  min-width: 2.4rem;
  padding: 0.35rem 0.55rem;
  border-radius: 999px;
  color: var(--secondary);
  text-align: center;
  text-decoration: none;
}

.language-nav a[aria-current="page"] {
  color: #fff;
  background: var(--violet);
}

.hero {
  padding: clamp(2rem, 7vw, 4.5rem) 0 clamp(1.8rem, 5vw, 3.25rem);
}

.eyebrow {
  margin: 0 0 0.55rem;
  color: var(--violet);
  font-size: 0.82rem;
  font-weight: 760;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.16;
  text-wrap: balance;
}

h1 {
  max-width: 15ch;
  margin: 0;
  font-size: clamp(2.35rem, 9vw, 4.8rem);
  letter-spacing: -0.055em;
}

.lede {
  max-width: 64ch;
  margin: 1.2rem 0 0;
  color: var(--secondary);
  font-size: clamp(1.02rem, 2.5vw, 1.22rem);
}

.summary-grid,
.language-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 0.9rem;
  margin: 0 0 1.8rem;
}

.summary-card,
.language-card,
.content-card,
.faq details {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.summary-card,
.language-card {
  padding: 1.15rem;
  border-radius: 1.4rem;
}

.summary-card strong,
.language-card strong {
  display: block;
  margin-bottom: 0.25rem;
}

.summary-card p,
.language-card p {
  margin: 0;
  color: var(--secondary);
  font-size: 0.94rem;
}

.language-card {
  color: var(--text);
  text-decoration: none;
}

.language-card:hover {
  border-color: rgba(98, 70, 229, 0.38);
  transform: translateY(-2px);
}

.content-card {
  margin-bottom: 1rem;
  padding: clamp(1.25rem, 4vw, 2rem);
  border-radius: 1.65rem;
}

.content-card h2 {
  margin: 0 0 0.8rem;
  font-size: 1.35rem;
}

.content-card h3 {
  margin: 1.45rem 0 0.5rem;
  font-size: 1.05rem;
}

.content-card p,
.content-card ul {
  margin-block: 0.65rem;
}

.content-card li + li {
  margin-top: 0.38rem;
}

.note {
  border-left: 0.28rem solid var(--mint);
}

.warning {
  border-left: 0.28rem solid var(--coral);
}

.faq {
  display: grid;
  gap: 0.75rem;
}

.faq details {
  border-radius: 1.25rem;
  overflow: hidden;
}

.faq summary {
  padding: 1.05rem 1.2rem;
  cursor: pointer;
  font-weight: 720;
}

.faq details > div {
  padding: 0 1.2rem 1.1rem;
  color: var(--secondary);
}

.faq details p:first-child {
  margin-top: 0;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
  padding-block: 2.5rem;
  color: var(--secondary);
  font-size: 0.88rem;
}

.site-footer p {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 1rem;
}

@media (max-width: 560px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .language-nav {
    justify-content: flex-start;
  }

  .hero {
    padding-top: 1.8rem;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .language-card {
    transition: transform 180ms ease, border-color 180ms ease;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #111017;
    --surface: rgba(31, 29, 40, 0.84);
    --surface-strong: #1d1b25;
    --text: #f5f2fc;
    --secondary: #bbb5ca;
    --line: rgba(232, 226, 255, 0.12);
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.24);
  }
}