/* 二哥项目资料站 — 移动端优先 */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-elev: #ffffff;
  --text: #1b1f24;
  --text-2: #57606a;
  --text-3: #8b949e;
  --line: #e6e8eb;
  --line-soft: #eef0f2;
  --accent: #2f6df6;
  --radius: 14px;
  --topbar-h: 56px;
  --shadow: 0 1px 2px rgba(16,24,40,.04), 0 8px 24px rgba(16,24,40,.06);
  --maxw: 860px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-soft: #16191f;
    --bg-elev: #1a1e25;
    --text: #e6e8eb;
    --text-2: #a8b0ba;
    --text-3: #7d8590;
    --line: #2a2f37;
    --line-soft: #22262d;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; border-radius: 10px; display: block; margin: 1.2em auto; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 60;
  height: var(--topbar-h);
  display: flex; align-items: center; gap: 8px;
  padding: 0 10px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex; align-items: center; gap: 9px;
  font-weight: 700; font-size: 16px; letter-spacing: .2px;
  flex: 1; min-width: 0;
}
.brand-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.brand-dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; flex: none;
  border: 0; background: transparent; color: var(--text-2);
  border-radius: 10px; cursor: pointer; -webkit-tap-highlight-color: transparent;
}
.icon-btn:hover { background: var(--bg-soft); color: var(--text); }
.icon-btn:active { transform: scale(.94); }
.burger, .burger::before, .burger::after {
  display: block; width: 18px; height: 2px; background: currentColor; border-radius: 2px;
  content: ""; position: relative;
}
.burger::before { position: absolute; top: -6px; }
.burger::after { position: absolute; top: 6px; }

/* ---------- 布局 ---------- */
.shell { display: flex; min-height: calc(100vh - var(--topbar-h)); }
.sidebar {
  position: fixed; top: var(--topbar-h); bottom: 0; left: 0; z-index: 55;
  width: 300px; max-width: 86vw;
  background: var(--bg-elev);
  border-right: 1px solid var(--line);
  overflow-y: auto; overscroll-behavior: contain;
  transform: translateX(-102%);
  transition: transform .26s cubic-bezier(.2,.8,.2,1);
  padding: 14px 10px 40px;
  -webkit-overflow-scrolling: touch;
}
body.nav-open .sidebar { transform: translateX(0); }
.scrim {
  position: fixed; inset: var(--topbar-h) 0 0 0; z-index: 54;
  background: rgba(0,0,0,.35); backdrop-filter: blur(2px);
}
.main {
  flex: 1; min-width: 0;
  padding: 22px 16px 72px;
}
.main > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }

/* ---------- 侧栏 ---------- */
.nav-group { margin-bottom: 6px; }
.nav-group-title {
  display: flex; align-items: center; gap: 8px;
  padding: 11px 10px; font-weight: 650; font-size: 14.5px; color: var(--text);
  cursor: default;
}
.nav-group-title .dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.nav-group-title i {
  margin-left: auto; font-style: normal; font-size: 12px; font-weight: 500;
  color: var(--text-3); background: var(--bg-soft);
  padding: 1px 7px; border-radius: 999px;
}
.nav-list { display: none; padding-left: 2px; }
.nav-group.open .nav-list { display: block; }
.nav-cat {
  font-size: 11.5px; font-weight: 700; letter-spacing: .08em;
  color: var(--text-3); text-transform: uppercase;
  padding: 12px 12px 5px;
}
.nav-item {
  display: block; padding: 8px 12px; margin: 1px 0;
  font-size: 13.5px; line-height: 1.5; color: var(--text-2);
  border-radius: 8px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.nav-item:hover { background: var(--bg-soft); color: var(--text); }
.nav-item.active {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent); font-weight: 650;
}
.side-home {
  display: block; padding: 10px 12px; margin-bottom: 8px;
  font-size: 14px; font-weight: 650; color: var(--text);
  border-bottom: 1px solid var(--line-soft);
}
.side-home:hover { color: var(--accent); }

/* ---------- 首页 ---------- */
.hero { padding: 26px 4px 18px; text-align: center; }
.hero h1 { font-size: clamp(26px, 7vw, 38px); line-height: 1.25; margin: 0 0 12px; letter-spacing: -.02em; }
.hero p { color: var(--text-2); margin: 0 auto 22px; max-width: 40em; font-size: 15px; }
.hero-stats {
  display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-bottom: 22px;
}
.hero-stats div {
  flex: 1 1 90px; max-width: 150px;
  background: var(--bg-soft); border: 1px solid var(--line-soft);
  border-radius: 12px; padding: 12px 6px;
}
.hero-stats strong { display: block; font-size: 22px; letter-spacing: -.02em; }
.hero-stats span { font-size: 12px; color: var(--text-3); }
.search-cta {
  border: 0; border-radius: 999px; padding: 12px 26px;
  background: var(--text); color: var(--bg);
  font-size: 15px; font-weight: 650; cursor: pointer;
  min-height: 46px;
}
.search-cta:active { transform: scale(.97); }

.col-grid { display: grid; gap: 14px; margin-top: 10px; }
.col-card {
  display: block; background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px;
  box-shadow: var(--shadow);
  transition: transform .18s ease, border-color .18s ease;
}
.col-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.col-top { display: flex; align-items: center; gap: 7px; margin-bottom: 8px; }
.col-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.col-src { font-size: 11.5px; font-weight: 650; color: var(--text-3); letter-spacing: .04em; }
.col-card h2 { font-size: 18px; margin: 0 0 6px; letter-spacing: -.01em; }
.col-card p { margin: 0 0 12px; font-size: 13.5px; color: var(--text-2); line-height: 1.65; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.chip {
  font-size: 11.5px; color: var(--text-2);
  background: var(--bg-soft); border: 1px solid var(--line-soft);
  padding: 2px 9px; border-radius: 999px;
}
.col-foot { display: flex; justify-content: space-between; align-items: center; font-size: 13px; }
.count { color: var(--text-3); }
.go { color: var(--accent); font-weight: 650; }

.tips { margin-top: 34px; padding: 20px; background: var(--bg-soft); border-radius: var(--radius); }
.tips h2 { font-size: 16px; margin: 0 0 12px; }
.tips ul { margin: 0; padding-left: 18px; }
.tips li { font-size: 14px; color: var(--text-2); margin-bottom: 8px; }
.tips b { color: var(--text); }

/* ---------- 专栏页 ---------- */
.column-head { padding: 18px 4px 10px; }
.column-head h1 { font-size: clamp(24px, 6vw, 32px); margin: 6px 0 10px; letter-spacing: -.02em; }
.column-head p { color: var(--text-2); font-size: 14.5px; margin: 0 0 14px; }
.col-actions { display: flex; gap: 14px; align-items: center; font-size: 13px; }
.src { color: var(--accent); font-weight: 600; }

.cat-block { margin-top: 28px; }
.cat-block h2 {
  font-size: 15px; letter-spacing: .01em; margin: 0 0 10px;
  display: flex; align-items: baseline; gap: 8px;
}
.cat-block h2 i { font-style: normal; font-size: 12px; color: var(--text-3); font-weight: 500; }
.link-list { list-style: none; margin: 0; padding: 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.link-list li { border-bottom: 1px solid var(--line-soft); }
.link-list li:last-child { border-bottom: 0; }
.link-list a {
  display: flex; align-items: center; gap: 10px;
  padding: 13px 14px; min-height: 50px;
  background: var(--bg-elev);
  transition: background .15s;
}
.link-list a:hover { background: var(--bg-soft); }
.link-list .idx { font-size: 12px; font-weight: 700; color: var(--text-3); flex: none; width: 22px; }
.link-list .t { flex: 1; min-width: 0; font-size: 14px; line-height: 1.5; }
.link-list .w { font-size: 11.5px; color: var(--text-3); flex: none; }

/* ---------- 文章页 ---------- */
.article { padding-top: 6px; }
.crumbs { display: flex; flex-wrap: wrap; gap: 6px; font-size: 12.5px; color: var(--text-3); margin-bottom: 12px; }
.crumbs a { color: var(--text-3); }
.crumbs a:hover { color: var(--accent); }
.crumbs em { font-style: normal; color: var(--text-2); }
.article-head h1 { font-size: clamp(23px, 6vw, 32px); line-height: 1.35; margin: 0 0 14px; letter-spacing: -.02em; }
.meta { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; font-size: 12.5px; color: var(--text-3); margin-bottom: 20px; }
.badge {
  color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: 2px 10px; border-radius: 999px; font-weight: 650; font-size: 12px;
}

.toc {
  background: var(--bg-soft); border: 1px solid var(--line-soft);
  border-radius: 12px; padding: 12px 16px; margin: 0 0 24px; font-size: 13.5px;
}
.toc summary { cursor: pointer; font-weight: 650; color: var(--text-2); }
.toc[open] { max-height: 45vh; overflow-y: auto; -webkit-overflow-scrolling: touch; }
.toc ul { margin: 10px 0 0; padding-left: 18px; }
.toc li { margin: 5px 0; line-height: 1.5; }
.toc a { color: var(--text-2); }
.toc a:hover { color: var(--accent); }
.toc ul ul { padding-left: 14px; }

.prose { font-size: 16px; line-height: 1.85; color: var(--text); }
.prose > :first-child { margin-top: 0; }
.prose h1, .prose h2, .prose h3, .prose h4 {
  line-height: 1.4; margin: 2em 0 .7em; letter-spacing: -.01em; scroll-margin-top: calc(var(--topbar-h) + 12px);
}
.prose h1 { font-size: 1.5em; }
.prose h2 {
  font-size: 1.28em; padding-bottom: .3em; border-bottom: 1px solid var(--line);
}
.prose h3 { font-size: 1.12em; }
.prose h4 { font-size: 1em; }
.prose p { margin: 1em 0; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 1em 0; }
.prose li { margin: .35em 0; }
.prose blockquote {
  margin: 1.2em 0; padding: .7em 1em;
  border-left: 3px solid color-mix(in srgb, var(--accent) 55%, transparent);
  background: var(--bg-soft); border-radius: 0 10px 10px 0;
  color: var(--text-2);
}
.prose blockquote p { margin: .3em 0; }
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2em 0; }
.prose table { width: 100%; border-collapse: collapse; font-size: 14px; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.prose th { background: var(--bg-soft); font-weight: 650; }

/* 行内代码 */
.prose code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: .88em;
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  padding: .12em .38em; border-radius: 5px;
  word-break: break-word;
}
/* 代码块 */
.prose .codehilite, .prose pre {
  margin: 1.2em 0;
  border-radius: 12px;
  border: 1px solid var(--line);
  overflow: hidden;
  background: #0d1117;
}
.prose pre {
  padding: 14px 16px; overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  font-size: 13px; line-height: 1.6;
}
.prose .codehilite pre { border: 0; margin: 0; border-radius: 0; padding: 14px 16px; }
.prose pre code {
  background: none; border: 0; padding: 0; font-size: inherit;
  color: #e6edf3; white-space: pre;
}
.prose .codehilite {
  position: relative;
}
.prose .codehilite::before {
  content: attr(data-lang);
  position: absolute; top: 0; right: 0;
  font-size: 10.5px; color: #8b949e;
  background: rgba(255,255,255,.06);
  padding: 3px 9px; border-radius: 0 12px 0 8px;
  letter-spacing: .04em; text-transform: uppercase;
}

.pager { display: flex; gap: 12px; margin: 44px 0 0; }
.pager-item {
  flex: 1; min-width: 0;
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: 12px; padding: 12px 14px;
  transition: border-color .15s;
}
.pager-item:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.pager-item span { display: block; font-size: 11.5px; color: var(--text-3); margin-bottom: 3px; }
.pager-item strong {
  display: block; font-size: 13.5px; font-weight: 600; line-height: 1.45;
  overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
}
.pager-item.next { text-align: right; }
.pager-item:only-child { flex: 1; }

/* ---------- 搜索 ---------- */
.search-modal {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(0,0,0,.4); backdrop-filter: blur(4px);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 8vh 16px 16px;
}
.search-modal[hidden] { display: none; }
.scrim[hidden] { display: none; }
.search-panel {
  width: 100%; max-width: 640px; max-height: 78vh;
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: 16px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; overflow: hidden;
}
.search-head {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 10px 10px 16px; border-bottom: 1px solid var(--line);
}
#searchInput {
  flex: 1; min-width: 0; border: 0; outline: 0; background: transparent;
  font-size: 16px; color: var(--text); padding: 10px 0;
  font-family: inherit;
}
#searchInput::placeholder { color: var(--text-3); }
.search-results { overflow-y: auto; padding: 8px; -webkit-overflow-scrolling: touch; }
.search-hint { color: var(--text-3); font-size: 13.5px; padding: 18px 10px; margin: 0; }
.result-item {
  display: block; padding: 12px 12px; border-radius: 10px;
}
.result-item:hover, .result-item:focus { background: var(--bg-soft); }
.result-item .rt { font-size: 14.5px; font-weight: 600; line-height: 1.45; margin-bottom: 4px; }
.result-item .rm { font-size: 11.5px; color: var(--text-3); margin-bottom: 5px; }
.result-item .rs {
  font-size: 12.5px; color: var(--text-2); line-height: 1.55;
  overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
}
.result-item mark { background: color-mix(in srgb, #f5c518 45%, transparent); color: inherit; border-radius: 3px; padding: 0 1px; }

/* ---------- 桌面端 ---------- */
@media (min-width: 1000px) {
  .topbar { padding: 0 20px; }
  #menuBtn { display: none; }
  .sidebar {
    transform: none; width: 292px;
    box-shadow: none;
  }
  .scrim { display: none !important; }
  .shell { padding-left: 292px; }
  .main { padding: 34px 44px 90px; }
  .nav-list { display: block; }
  .nav-group-title { cursor: default; }
  .col-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding-top: 46px; }
  .link-list .t { font-size: 14.5px; }
}

@media (min-width: 1400px) {
  .sidebar { width: 320px; }
  .shell { padding-left: 320px; }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}