/* Xyner 教程静态站点 — 阅读友好、可整包上传 CDN/静态主机 */
:root {
  --bg: #0f1419;
  --surface: #151b23;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --warn: #d29922;
  --danger: #f85149;
  --code-bg: #21262d;
  --font-sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Consolas", monospace;
  --radius: 8px;
  --max: 860px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(15, 20, 25, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  max-width: calc(var(--max) + 48px);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
}
.site-brand:hover {
  color: var(--accent);
  text-decoration: none;
}

.site-nav a {
  margin-left: 1rem;
  font-size: 0.875rem;
  color: var(--muted);
}
.site-nav a:hover {
  color: var(--accent);
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
}

@media (min-width: 640px) {
  .content {
    padding: 2.25rem 2.5rem;
  }
}

.content > *:first-child {
  margin-top: 0;
}

.content > *:last-child {
  margin-bottom: 0;
}

h1,
h2,
h3,
h4 {
  font-weight: 650;
  line-height: 1.3;
  margin-top: 1.75em;
  margin-bottom: 0.6em;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 1.75rem;
  margin-top: 0;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

h2 {
  font-size: 1.35rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.35rem;
}

h3 {
  font-size: 1.12rem;
}

h4 {
  font-size: 1rem;
  opacity: 0.95;
}

p {
  margin: 0.85em 0;
}

blockquote {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border-left: 4px solid var(--warn);
  background: rgba(210, 153, 34, 0.08);
  color: var(--text);
}
blockquote p {
  margin: 0.35em 0;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

ul,
ol {
  margin: 0.75em 0;
  padding-left: 1.35rem;
}

li {
  margin: 0.35em 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.92rem;
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--code-bg);
  font-weight: 600;
}

tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.02);
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.12em 0.35em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.5;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}

.site-footer {
  max-width: calc(var(--max) + 48px);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

.page-intro {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.card-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.card-list li {
  margin: 0;
  border-bottom: 1px solid var(--border);
}

.card-list li:last-child {
  border-bottom: none;
}

.card-list a {
  display: block;
  padding: 0.85rem 0;
  color: var(--text);
  font-weight: 500;
}
.card-list a:hover {
  color: var(--accent);
  text-decoration: none;
}

.card-list small {
  display: block;
  font-weight: 400;
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}