/* 练手站：尽量少的样式，便于改着玩 */
:root {
  --text: #222;
  --muted: #555;
  --line: #ccc;
  --link: #06c;
  --max: 40rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: #fff;
  padding-bottom: env(safe-area-inset-bottom, 0);
}

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

a:hover {
  text-decoration: underline;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 max(1rem, env(safe-area-inset-left, 0))
    0 max(1rem, env(safe-area-inset-right, 0));
}

.site-header {
  border-bottom: 1px solid var(--line);
  padding-top: env(safe-area-inset-top, 0);
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.site-notice {
  border-bottom: 1px solid var(--line);
  font-size: 0.875rem;
  color: var(--muted);
}

.site-notice .wrap {
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.site-notice p {
  margin: 0;
}

.brand {
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
  color: var(--link);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--link);
  text-decoration: underline;
}

/* 首页 */
.page-simple {
  padding: 1.5rem 0 2.5rem;
}

.page-simple h1 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  font-weight: 600;
}

.page-simple .lede {
  margin: 0 0 1rem;
  color: var(--muted);
}

.simple-links {
  margin: 0;
  padding-left: 1.25rem;
}

.simple-links li {
  margin: 0.35rem 0;
}

/* 列表页 */
.page-hero {
  padding: 1.25rem 0 0.5rem;
}

.page-hero h1 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
}

.page-hero .lede {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.section.flush-top {
  padding-top: 0;
}

.article-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.article-list li {
  border-bottom: 1px solid var(--line);
}

.article-list a {
  display: block;
  padding: 0.85rem 0;
  color: inherit;
  text-decoration: none;
}

.article-list a:hover .article-list-title {
  text-decoration: underline;
}

.article-list-title {
  margin: 0 0 0.2rem;
  font-size: 1rem;
  font-weight: 600;
}

.article-list-meta {
  font-size: 0.85rem;
  color: var(--muted);
}

/* 文章正文 */
.article-shell {
  padding: 1rem 0 2rem;
}

.article-header {
  margin-bottom: 1rem;
}

.article-header h1 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
  line-height: 1.3;
}

.article-meta {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

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

.prose h2 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1.1rem;
}

.prose h3 {
  margin: 1rem 0 0.35rem;
  font-size: 1rem;
  font-weight: 600;
}

.prose figure {
  margin: 1rem 0;
}

.prose figure img {
  max-width: 100%;
  height: auto;
  display: block;
}

.prose figcaption {
  margin-top: 0.4rem;
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.45;
}

.prose .term-list dt {
  margin-top: 0.65rem;
  font-weight: 600;
}

.prose .term-list dd {
  margin: 0.2rem 0 0 0;
  padding-left: 0;
}

.prose p {
  margin: 0 0 0.85rem;
}

.prose ul,
.prose ol {
  margin: 0 0 0.85rem;
  padding-left: 1.25rem;
}

.prose li {
  margin: 0.25rem 0;
}

.prose strong {
  font-weight: 600;
}

.prose .note {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  background: #f9f9f9;
  font-size: 0.95rem;
}

.prose code {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: #f0f0f0;
  padding: 0.1em 0.35em;
}

.prose pre {
  margin: 0.85rem 0;
  padding: 0.85rem 1rem;
  background: #1e1e1e;
  color: #e8e8e8;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.45;
}

.prose pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.back-link {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.site-footer {
  padding: 1.25rem 0 max(1.5rem, env(safe-area-inset-bottom, 0));
  color: var(--muted);
  font-size: 0.875rem;
}

.footer-inner {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

.footer-inner p {
  margin: 0.2rem 0;
}