:root {
  --bg: #f4f8fb;
  --paper: #ffffff;
  --text: #1b2a33;
  --muted: #5a6e76;
  --accent: #1e6b8a;
  --border: #c9d6dc;
  --link: #1e6b8a;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: linear-gradient(180deg, #e8f1f6 0%, var(--bg) 40%, #eef4f7 100%);
  color: var(--text);
  line-height: 1.55;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 18px 56px;
}

.page {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px 20px;
  margin-bottom: 18px;
  box-shadow: 0 8px 24px rgba(27, 42, 51, 0.06);
}

.brand {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 6px;
  color: var(--accent);
}

h1 {
  font-size: 1.55rem;
  line-height: 1.25;
  margin: 0 0 10px;
}

h2 {
  font-size: 1.15rem;
  margin: 1.4em 0 0.45em;
}

h3 {
  font-size: 1rem;
  margin: 1em 0 0.35em;
}

p,
li {
  color: var(--text);
}

.meta,
.muted {
  color: var(--muted);
  font-size: 0.92rem;
}

.langs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.langs a {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.88rem;
  background: #f7fafb;
}

.langs a[aria-current="page"] {
  background: #d7eaf3;
  border-color: #9fc5d4;
}

article {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 8px 20px 24px;
  box-shadow: 0 8px 24px rgba(27, 42, 51, 0.05);
}

ul {
  padding-left: 1.2em;
}

a {
  color: var(--link);
}

.todo {
  background: #fff8e8;
  border: 1px solid #e4c87a;
  border-radius: 12px;
  padding: 12px 14px;
  color: #6e5424;
  font-size: 0.92rem;
}

@media (min-width: 720px) {
  main {
    padding-top: 40px;
  }

  h1 {
    font-size: 1.8rem;
  }
}