:root {
  color-scheme: light dark;
  --background: #f6f7fb;
  --surface: rgba(255, 255, 255, 0.82);
  --text: #18191d;
  --muted: #5e616b;
  --line: rgba(24, 25, 29, 0.11);
  --accent: #5a4ae3;
  --accent-strong: #4435c8;
  --accent-soft: rgba(90, 74, 227, 0.1);
  --shadow: 0 20px 60px rgba(36, 29, 102, 0.1);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% 0%, rgba(135, 118, 255, 0.16), transparent 34rem),
    radial-gradient(circle at 90% 12%, rgba(255, 152, 202, 0.14), transparent 28rem),
    var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Helvetica Neue", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--accent-strong);
}

a:focus-visible,
.button:focus-visible {
  outline: 3px solid rgba(90, 74, 227, 0.34);
  outline-offset: 4px;
}

.site-header,
main,
footer {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 11px;
  background: linear-gradient(145deg, #7667ff, #d965b1);
  color: white;
  box-shadow: 0 8px 22px rgba(90, 74, 227, 0.26);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
}

nav a {
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 600;
  text-decoration: none;
}

nav a[aria-current="page"],
nav a:hover {
  color: var(--text);
}

.hero {
  max-width: 820px;
  margin: 96px auto 88px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.025em;
}

h1 {
  margin: 0;
  font-size: clamp(2.55rem, 7vw, 5.3rem);
  letter-spacing: -0.055em;
}

.hero-copy {
  max-width: 690px;
  margin: 26px auto 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2.2vw, 1.28rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 12px 28px rgba(90, 74, 227, 0.24);
}

.button.primary:hover {
  background: var(--accent-strong);
  color: white;
}

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

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.card {
  min-height: 240px;
  padding: 28px;
  border-radius: var(--radius);
}

.card-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 14px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.35rem;
}

.card h2 {
  margin: 24px 0 10px;
  font-size: 1.25rem;
}

.card p,
.english-summary p {
  color: var(--muted);
}

.english-summary {
  margin: 22px 0 80px;
  padding: 34px;
  border-radius: var(--radius);
}

.english-summary h2 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.3rem);
}

.document {
  max-width: 860px;
  margin: 50px auto 80px;
  padding: clamp(28px, 6vw, 72px);
  border-radius: 30px;
}

.document h1 {
  max-width: 720px;
  font-size: clamp(2.35rem, 6vw, 4.4rem);
}

.document .lead {
  margin: 22px 0 42px;
  color: var(--muted);
  font-size: 1.15rem;
}

.document h2 {
  margin: 42px 0 12px;
  font-size: 1.35rem;
}

.document p,
.document li {
  color: var(--muted);
}

.document li + li {
  margin-top: 7px;
}

.document hr {
  margin: 70px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.notice {
  margin: 28px 0;
  padding: 18px 20px;
  border: 1px solid rgba(90, 74, 227, 0.18);
  border-radius: 16px;
  background: var(--accent-soft);
  color: var(--muted);
}

.notice strong {
  color: var(--text);
}

.muted {
  font-size: 0.9rem;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

footer p {
  margin: 0;
}

@media (max-width: 760px) {
  .site-header {
    padding: 14px 0;
    align-items: flex-start;
  }

  nav {
    justify-content: flex-end;
    gap: 12px 16px;
  }

  .hero {
    margin: 68px auto 62px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .card {
    min-height: 0;
  }

  .document {
    margin-top: 28px;
  }

  footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .button {
    transition: none;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #101116;
    --surface: rgba(28, 29, 37, 0.82);
    --text: #f2f2f5;
    --muted: #b6b7c1;
    --line: rgba(255, 255, 255, 0.1);
    --accent: #a99cff;
    --accent-strong: #c0b7ff;
    --accent-soft: rgba(169, 156, 255, 0.12);
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.22);
  }
}