:root {
  --bg: #0b1020;
  --bg-soft: #11182d;
  --card: rgba(18, 25, 46, 0.88);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #eef2ff;
  --muted: #aeb8d4;
  --accent: #b9a7ff;
  --accent-strong: #8f79ff;
  --accent-soft: rgba(185, 167, 255, 0.18);
  --success: #74d99f;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.28);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --maxw: 1200px;
  --line: rgba(255, 255, 255, 0.09);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(143, 121, 255, 0.18), transparent 34%),
    radial-gradient(circle at top right, rgba(60, 130, 255, 0.12), transparent 28%),
    linear-gradient(180deg, #070b16 0%, #0b1020 100%);
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

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

.container {
  width: min(calc(100% - 32px), var(--maxw));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.topbar {
  display: grid;
  grid-template-columns: 1.4fr auto auto;
  gap: 18px;
  align-items: center;
  padding: 18px 20px;
  border: 1px solid var(--card-border);
  background: rgba(10, 15, 30, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.logo {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  object-fit: cover;
  background: rgba(255, 255, 255, 0.06);
  flex: 0 0 auto;
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.2rem, 2vw, 1.7rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.sub {
  display: inline-block;
  margin-left: 8px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

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

.nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  color: var(--muted);
  border: 1px solid transparent;
  background: transparent;
  font-weight: 600;
  transition: 0.2s ease;
}

.nav a:hover {
  text-decoration: none;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.nav a.active {
  color: #1a1730;
  background: var(--accent);
  border-color: transparent;
}

.lang {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.hint {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

.lang button {
  appearance: none;
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  min-width: 48px;
  height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  transition: 0.2s ease;
}

.lang button:hover {
  background: rgba(255, 255, 255, 0.08);
}

.lang button.active {
  background: var(--accent-soft);
  border-color: rgba(185, 167, 255, 0.35);
  color: #e9e2ff;
}

.hero {
  margin-top: 22px;
  padding: 28px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--card-border);
  background:
    linear-gradient(180deg, rgba(20, 28, 52, 0.92), rgba(13, 18, 35, 0.92)),
    radial-gradient(circle at top left, rgba(185, 167, 255, 0.22), transparent 35%);
  box-shadow: var(--shadow);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--muted);
  border: 1px solid var(--card-border);
  font-size: 0.9rem;
  font-weight: 700;
}

.badge i {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--success);
  box-shadow: 0 0 0 4px rgba(116, 217, 159, 0.12);
}

.hero h2 {
  margin: 18px 0 10px;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.hero p {
  margin: 0;
  max-width: 760px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.grid {
  display: grid;
  grid-template-columns: minmax(0, 2.1fr) minmax(280px, 0.9fr);
  gap: 22px;
  margin-top: 22px;
}

.card {
  padding: 28px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--card-border);
  background: var(--card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 14px;
  font-size: 1.22rem;
  letter-spacing: -0.02em;
}

.card p,
.card li {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.card p {
  margin: 0 0 14px;
}

.card ul {
  margin: 0;
  padding-left: 20px;
}

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

.sep {
  margin: 22px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.footer {
  margin-top: 22px;
  color: var(--muted);
  font-size: 0.92rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95em;
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 6px;
  border-radius: 8px;
}

b,
strong {
  color: var(--text);
}

@media (max-width: 980px) {
  .topbar {
    grid-template-columns: 1fr;
    justify-items: start;
  }

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

  .lang {
    justify-content: flex-start;
  }

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

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 20px), var(--maxw));
    padding-top: 16px;
    padding-bottom: 28px;
  }

  .topbar,
  .hero,
  .card {
    padding: 20px;
    border-radius: 22px;
  }

  .brand {
    align-items: flex-start;
  }

  .logo {
    width: 48px;
    height: 48px;
    border-radius: 14px;
  }

  .sub {
    display: block;
    margin: 6px 0 0;
  }

  .nav {
    width: 100%;
  }

  .nav a {
    min-height: 40px;
    padding: 0 14px;
  }

  .hero h2 {
    line-height: 1.06;
  }

  .card h3 {
    font-size: 1.12rem;
  }

  .card p,
  .card li,
  .hero p {
    font-size: 0.97rem;
  }
}