:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #1c2430;
  --muted: #566277;
  --line: #e1e6ee;
  --accent: #2357a5;
}

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

html {
  font-size: 16px;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: linear-gradient(180deg, #f8faff 0%, var(--bg) 40%, #f3f5f9 100%);
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.site-nav ul {
  list-style: none;
  max-width: 920px;
  margin: 0 auto;
  padding: 0.6rem 0.9rem;
  display: flex;
  gap: 0.35rem;
  overflow-x: auto;
}

.site-nav li {
  margin: 0;
}

.site-nav a {
  display: block;
  white-space: nowrap;
  font-size: 0.92rem;
  line-height: 1;
  color: var(--muted);
  text-decoration: none;
  padding: 0.52rem 0.72rem;
  border-radius: 999px;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.site-nav a:hover {
  background: #edf2fb;
  color: #173f7c;
}

.page {
  max-width: 920px;
  margin: 1.2rem auto 2.5rem;
  padding: 2.2rem 2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(23, 33, 56, 0.05);
}

[id] {
  scroll-margin-top: 4.3rem;
}

h1,
h2 {
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-top: 2rem;
  margin-bottom: 0.8rem;
  color: #111a29;
}

h1 {
  font-size: clamp(1.5rem, 2vw, 2rem);
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.55rem;
}

h2 {
  font-size: clamp(1.2rem, 1.5vw, 1.45rem);
}

p,
ul {
  margin-top: 0.7rem;
  margin-bottom: 0.9rem;
}

ul {
  padding-left: 1.25rem;
}

li + li {
  margin-top: 0.35rem;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  color: #173f7c;
}

img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: 0.35rem 0 0.9rem;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #eef2f8;
}

hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 1.6rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  margin-bottom: 0.8rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: #fbfcff;
}

td {
  padding: 0.7rem 0.85rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

tr:first-child td {
  font-weight: 600;
  color: #182338;
  background: #f0f4fb;
}

tr:last-child td {
  border-bottom: none;
}

td p {
  margin: 0;
}

@media (max-width: 760px) {
  .page {
    margin: 0;
    border-radius: 0;
    border-left: none;
    border-right: none;
    padding: 1.3rem 1rem 1.8rem;
  }

  table,
  tr,
  td {
    display: block;
    width: 100%;
  }

  tr {
    border-bottom: 1px solid var(--line);
  }

  tr:first-child {
    position: sticky;
    top: 0;
    z-index: 1;
  }

  td {
    border: none;
    padding: 0.45rem 0.25rem;
  }

  .site-nav ul {
    padding: 0.52rem 0.55rem;
  }

  .site-nav a {
    font-size: 0.88rem;
    padding: 0.46rem 0.65rem;
  }
}