:root {
  --button-primary: #3d5279;
  --button-primary-light: #5f749b;
  --accent: #4eaefd;
  --bg: #ffffff;
  --text-primary: #37474f;
  --text-primary-light: #77878f;
  --surface: #f7fbff;
  --line: rgba(61, 82, 121, 0.16);
  --shadow: 0 10px 28px rgba(61, 82, 121, 0.14);
  --radius: 18px;
  --max: 1100px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: "IBM Plex Sans", "Segoe UI", sans-serif;
  --heading: "Sora", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--sans);
  background:
    radial-gradient(circle at 15% 0%, rgba(78, 174, 253, 0.24), transparent 42%),
    radial-gradient(circle at 95% 10%, rgba(255, 132, 110, 0.18), transparent 35%),
    linear-gradient(180deg, #fafdff 0%, #f4f8fe 45%, #ffffff 100%);
  color: var(--text-primary);
  line-height: 1.55;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.3;
  background-image:
    linear-gradient(to right, rgba(61, 82, 121, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(61, 82, 121, 0.04) 1px, transparent 1px);
  background-size: 42px 42px;
}

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

a:hover {
  text-decoration: underline;
}

header,
main,
footer {
  position: relative;
  z-index: 1;
}

header {
  padding: 24px 16px 10px;
}

main {
  padding: 8px 16px 42px;
}

footer {
  padding: 0 16px 32px;
  color: var(--text-primary-light);
  font-size: 0.88rem;
  text-align: center;
}

.footer-links {
  margin-top: 8px;
  display: inline-flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

.footer-links a {
  color: var(--button-primary);
  font-weight: 600;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
}

.topbar {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(61, 82, 121, 0.2);
}

.brand span {
  font-family: var(--heading);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.doc-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.doc-nav a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  background: #fff;
  font-weight: 600;
  color: var(--button-primary);
}

.doc-nav a.is-active {
  color: #fff;
  background: linear-gradient(135deg, var(--button-primary) 0%, var(--button-primary-light) 100%);
  border-color: transparent;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(4px);
}

.lang-btn {
  border: 0;
  background: transparent;
  color: var(--button-primary);
  font-family: var(--heading);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  border-radius: 999px;
  padding: 7px 10px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.lang-btn.is-active {
  background: linear-gradient(135deg, var(--button-primary) 0%, var(--button-primary-light) 100%);
  color: #fff;
}

.card {
  padding: 20px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(247, 251, 255, 0.9));
  box-shadow: var(--shadow);
  margin-top: 14px;
}

h1,
h2,
h3 {
  font-family: var(--heading);
  letter-spacing: -0.01em;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(1.35rem, 2.3vw, 1.8rem);
}

h2 {
  margin: 16px 0 8px;
  font-size: 1.05rem;
}

h3 {
  margin: 18px 0 8px;
  font-size: 1rem;
}

p {
  margin: 8px 0;
  color: var(--text-primary);
}

ul {
  margin: 8px 0 8px 18px;
  padding: 0;
}

li {
  margin: 6px 0;
}

.pill {
  display: inline-block;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(78, 174, 253, 0.08);
  font-size: 0.75rem;
  color: var(--text-primary-light);
  margin-right: 8px;
  margin-bottom: 10px;
}

.muted {
  color: var(--text-primary-light);
}

.mono {
  font-family: var(--mono);
}

.hidden {
  display: none !important;
}

.grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 14px;
  margin-top: 14px;
}

.kv {
  display: grid;
  grid-template-columns: minmax(120px, 180px) 1fr;
  gap: 8px 12px;
}

.linkbox {
  font-family: var(--mono);
  word-break: break-word;
}

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

@media (max-width: 680px) {
  .topbar {
    flex-wrap: wrap;
    justify-content: space-between;
  }

  .card {
    padding: 16px;
  }

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