:root {
  --bg: #0b1220;
  --card: #111a2b;
  --muted: #aeb7c5;
  --text: #e7ecf3;
  --accent: #3ea6ff;
  --ok: #36d399;
  --warn: #fbbf24;
}
* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell,
    Noto Sans, sans-serif;
  line-height: 1.6;
}
a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}
.site-header {
  position: sticky;
  top: 0;
  background: rgba(11, 18, 32, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #1f2a44;
  z-index: 10;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-weight: 800;
  letter-spacing: 0.3px;
  padding: 14px 0;
  display: block;
}
.nav a {
  margin-left: 16px;
  padding: 14px 0;
  display: inline-block;
}
.content {
  padding: 32px 0 56px;
}
.hero {
  padding: 56px 0;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  margin: 0 0 10px;
}
.hero p {
  margin: 0.5rem 0 1rem;
  color: var(--muted);
}
.cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.btn {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  border: 1px solid #2a3a5a;
  background: #162038;
  padding: 10px 14px;
  border-radius: 10px;
}
.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  margin: 20px 0;
}
.card {
  background: var(--card);
  border: 1px solid #1f2a44;
  padding: 18px;
  border-radius: 12px;
}
.card h3 {
  margin: 0 0 6px;
}
.kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  background: #0b1324;
  border: 1px solid #23304f;
  border-radius: 6px;
  padding: 2px 6px;
}
.toc {
  background: var(--card);
  border: 1px solid #1f2a44;
  padding: 14px;
  border-radius: 10px;
  margin: 14px 0;
}
blockquote {
  border-left: 3px solid #314268;
  padding-left: 12px;
  margin-left: 0;
  color: #cbd5e1;
}
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid #1f2a44;
  border-radius: 10px;
  overflow: hidden;
}
th,
td {
  padding: 10px;
  border-bottom: 1px solid #253251;
  text-align: left;
}
.note {
  font-size: 0.95rem;
  color: var(--muted);
}
.badge {
  font-size: 0.75rem;
  border: 1px solid #2a3a5a;
  border-radius: 999px;
  padding: 2px 8px;
}
.site-footer {
  border-top: 1px solid #1f2a44;
  padding: 18px 0;
  background: #0b1220;
}
hr {
  border: none;
  border-top: 1px solid #1f2a44;
  margin: 24px 0;
}
ul.check {
  list-style: none;
  padding-left: 0;
}
ul.check li::before {
  content: "✔";
  margin-right: 8px;
  color: var(--ok);
}
.small {
  font-size: 0.9rem;
  color: var(--muted);
}
.tiny {
  font-size: 0.8rem;
  color: #9aa5b5;
}
figure {
  margin: 0;
}
pre {
  background: #0b1324;
  border: 1px solid #23304f;
  border-radius: 8px;
  padding: 12px;
  overflow: auto;
}
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}
input,
textarea,
button {
  font: inherit;
  background: #0d172a;
  color: var(--text);
  border: 1px solid #243655;
  border-radius: 10px;
  padding: 10px;
}
label {
  display: block;
  margin: 0.5rem 0 0.2rem;
}
button {
  cursor: pointer;
}