:root {
  color-scheme: light;
  --bg: #f7f7fa;
  --bg-soft: #fbfbfd;
  --panel: #ffffff;
  --panel-soft: #f2f4f8;
  --text: #1e2230;
  --muted: #666e7f;
  --line: #e7e9ef;
  --line-strong: #d8dde7;
  --accent: #4f6edc;
  --accent-strong: #3f5eca;
  --accent-soft: #eef1ff;
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.06);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 18px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #fcfcfe 0%, var(--bg) 100%);
}

a {
  color: var(--accent-strong);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  display: block;
  max-width: 100%;
}

.site-shell {
  max-width: 1220px;
  margin: 0 auto;
  padding: 26px 24px 80px;
}

.site-shell-home {
  max-width: 1280px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 30px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  border-radius: 18px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
}

.home-header {
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(79, 110, 220, 0.18);
  flex: 0 0 auto;
}

.brand-copy strong {
  display: block;
  font-size: 18px;
  line-height: 1.2;
}

.brand-copy span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  font-size: 14px;
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  background: var(--accent-soft);
  border-color: #ccd6ff;
  color: var(--accent-strong);
}

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 40px;
  align-items: center;
  padding: 36px 24px 14px;
}

.home-copy {
  padding: 16px 0;
}

.home-label {
  margin: 0 0 8px;
  color: var(--accent);
  font-weight: 700;
  font-size: clamp(42px, 6vw, 64px);
  line-height: 0.95;
}

.home-copy h1 {
  margin: 0;
  max-width: 720px;
  font-size: clamp(42px, 5.8vw, 70px);
  line-height: 1.04;
  letter-spacing: -0.05em;
}

.home-summary {
  max-width: 640px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(19px, 2vw, 22px);
  line-height: 1.65;
}

.home-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
}

.button:hover {
  text-decoration: none;
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #6984e9);
  box-shadow: 0 14px 28px rgba(79, 110, 220, 0.22);
}

.button-secondary {
  color: var(--text);
  background: #eef0f5;
  border-color: #e2e5ec;
}

.hero-art {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-art-glow {
  position: absolute;
  inset: 48px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0) 38%),
    radial-gradient(circle at 70% 70%, rgba(91, 128, 255, 0.2), rgba(91, 128, 255, 0) 45%),
    linear-gradient(135deg, rgba(80, 111, 220, 0.18), rgba(124, 146, 232, 0.05));
  filter: blur(8px);
}

.hero-art-icon {
  position: relative;
  width: min(86%, 440px);
  border-radius: 28%;
  box-shadow: 0 28px 60px rgba(79, 110, 220, 0.22);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 26px;
}

.feature-card {
  min-height: 188px;
  padding: 26px 24px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.feature-card h2 {
  margin: 0 0 14px;
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.doc-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 248px;
  gap: 32px;
  align-items: start;
}

.doc-main {
  min-width: 0;
}

.hero,
.doc-section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero {
  padding: 30px 34px;
}

.doc-section {
  margin-top: 20px;
  padding: 28px 34px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 700;
}

.hero h1 {
  margin: 18px 0 10px;
  font-size: clamp(34px, 4vw, 48px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  max-width: 860px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.72;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
}

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

.language-switch {
  display: inline-flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.language-switch a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
}

.language-switch a[aria-current="page"] {
  border-color: #c7d0ff;
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.doc-section h2 {
  margin: 0;
  font-size: 30px;
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.section-subtitle {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.doc-content {
  margin-top: 18px;
  color: var(--text);
  font-size: 16px;
  line-height: 1.82;
}

.doc-content p,
.doc-content ul,
.doc-content ol {
  margin: 0 0 14px;
}

.doc-content ul,
.doc-content ol {
  padding-left: 22px;
}

.doc-content li + li {
  margin-top: 8px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  text-decoration: none;
}

.doc-aside {
  position: sticky;
  top: 24px;
}

.toc {
  padding: 22px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
}

.toc h2 {
  margin: 0 0 14px;
  font-size: 16px;
}

.toc ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc li + li {
  margin-top: 10px;
}

.toc a {
  color: var(--muted);
  font-size: 14px;
}

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

@media (max-width: 1080px) {
  .site-header {
    flex-wrap: wrap;
  }

  .home-hero,
  .doc-layout {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .doc-aside {
    position: static;
  }
}

@media (max-width: 720px) {
  .site-shell,
  .site-shell-home {
    padding: 18px 16px 56px;
  }

  .site-header {
    padding: 14px;
  }

  .home-hero {
    gap: 18px;
    padding: 10px 4px 0;
  }

  .hero-art {
    min-height: 260px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    margin-top: 20px;
  }

  .hero,
  .doc-section {
    padding: 22px 20px;
  }

  .home-copy h1 {
    font-size: 42px;
  }

  .home-label {
    font-size: 38px;
  }

  .home-summary,
  .hero-subtitle {
    font-size: 17px;
  }
}