:root {
  --bg: #f3f5f7;
  --panel: #ffffff;
  --text: #232a31;
  --muted: #5c6672;
  --accent: #0779bf;
  --accent-2: #48a9e4;
  --header-bg: #101720;
  --header-bg-2: #1c2733;
  --border: #dde3e9;
  --code-bg: #eef1f4;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

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

img { max-width: 100%; display: block; }

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background: linear-gradient(180deg, var(--header-bg-2) 0%, var(--header-bg) 100%);
  color: #e8edf2;
  padding: 18px 0;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand img {
  width: 44px;
  height: 44px;
}

.brand-text .name {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
}

.brand-text .name .dmnt { color: var(--accent-2); }

.brand-text .slogan {
  font-size: 0.85rem;
  color: #9fb0bf;
}

.social a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #cfe0ee;
  font-size: 0.9rem;
}

.social img { width: 18px; height: 18px; }

nav.main-nav {
  margin-top: 14px;
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 12px;
}

nav.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
}

nav.main-nav a {
  color: #cfe0ee;
  font-size: 0.92rem;
}

nav.main-nav a:hover { color: #fff; }

main { padding: 30px 0 50px; }

.intro {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 28px;
}

.intro h1 {
  margin-top: 0;
  font-size: 1.5rem;
}

.categories {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.category {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: #fafcfd;
}

.category img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.category .cat-body {
  padding: 12px 14px;
}

.category h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
}

.category p {
  margin: 0 0 8px;
  font-size: 0.88rem;
  color: var(--muted);
}

.category ul {
  margin: 0;
  padding-left: 18px;
  font-size: 0.86rem;
}

.category ul li { margin-bottom: 4px; }
.category ul li.plain { color: var(--muted); }

.tips-teaser {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 28px;
}

.tips-teaser h2 { margin-top: 0; }

.tips-teaser ul { padding-left: 20px; }
.tips-teaser li { margin-bottom: 10px; }
.tips-teaser p.excerpt {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

article.guide {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 26px 28px;
  margin-bottom: 26px;
  scroll-margin-top: 16px;
}

article.guide h2 {
  margin-top: 0;
  color: var(--accent);
  border-bottom: 2px solid var(--border);
  padding-bottom: 10px;
}

article.guide .meta {
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 16px;
}

article.guide h3 { color: #17303f; }

article.guide .figure {
  margin: 16px 0;
  text-align: center;
}

article.guide .figure img {
  max-width: 320px;
  margin: 0 auto;
  border-radius: 6px;
  border: 1px solid var(--border);
}

article.guide .figure figcaption {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 6px;
}

article.guide code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.92em;
}

article.guide dl {
  margin: 14px 0;
}

article.guide dt {
  margin-top: 10px;
}

article.guide dt code {
  font-size: 0.95em;
}

article.guide dd {
  margin: 4px 0 0 0;
  color: var(--muted);
}

article.guide hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 18px 0;
}

article.guide .toc {
  background: var(--code-bg);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 16px 0;
}

article.guide .toc p { margin: 0 0 8px; font-weight: 600; }
article.guide .toc ul { margin: 0; padding-left: 20px; }
article.guide .toc ul ul { margin-top: 4px; }

.missing-note {
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}

footer {
  background: var(--header-bg);
  color: #9fb0bf;
  padding: 26px 0;
  margin-top: 20px;
}

footer .foot-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

footer img { width: 34px; height: 34px; }

footer .foot-text a { color: #cfe0ee; }
footer .foot-text { font-size: 0.9rem; }

@media (max-width: 720px) {
  .categories { grid-template-columns: 1fr; }
  article.guide { padding: 20px; }
}