/* ===========================================================
   主题变量：想换配色改这里就行
   =========================================================== */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --surface: #ffffff;
  --border: #e5e7eb;
  --text: #1b1f24;
  --text-soft: #5b6470;
  --accent: #2f6feb;
  --accent-soft: rgba(47, 111, 235, 0.1);
  --code-bg: #f6f8fa;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.05);
  --radius: 14px;
  --maxw: 780px;
  --maxw-wide: 1080px;
}

[data-theme="dark"] {
  --bg: #0e1116;
  --bg-soft: #141920;
  --surface: #161b22;
  --border: #262d36;
  --text: #e6edf3;
  --text-soft: #9aa4b2;
  --accent: #6ea8fe;
  --accent-soft: rgba(110, 168, 254, 0.14);
  --code-bg: #0b0f14;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", Helvetica, Arial, sans-serif;
  font-size: 16.5px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

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

.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--accent); color: #fff;
  padding: 8px 14px; border-radius: 0 0 8px 0; z-index: 99;
}
.skip-link:focus { left: 0; }

/* ---------------- header ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 18px; height: 62px; }
.site-title { font-weight: 700; font-size: 1.06rem; color: var(--text); letter-spacing: .2px; }
.site-title:hover { text-decoration: none; color: var(--accent); }
.site-nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav-link {
  color: var(--text-soft); font-size: .94rem; padding: 5px 10px; border-radius: 8px;
}
.nav-link:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.nav-link.is-active { color: var(--accent); background: var(--accent-soft); }

.theme-toggle {
  border: 1px solid var(--border); background: var(--surface); color: var(--text-soft);
  width: 34px; height: 34px; border-radius: 50%; cursor: pointer; font-size: .95rem;
  display: grid; place-items: center; padding: 0;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: inline; }

/* ---------------- layout ---------------- */
main { padding: 40px 20px 64px; }

.page-title { font-size: 1.9rem; line-height: 1.3; margin: 0 0 8px; letter-spacing: -.01em; }
.page-desc { color: var(--text-soft); margin: 0 0 32px; }
.section-title { font-size: 1.15rem; margin: 40px 0 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.muted { color: var(--text-soft); }
.empty { color: var(--text-soft); background: var(--bg-soft); padding: 16px 18px; border-radius: var(--radius); }

/* ---------------- post list ---------------- */
.post-list { display: flex; flex-direction: column; gap: 14px; }
.post-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.post-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
.post-card-title { margin: 0 0 6px; font-size: 1.22rem; line-height: 1.45; }
.post-card-title a { color: var(--text); }
.post-card-title a:hover { color: var(--accent); text-decoration: none; }
.post-card-meta { margin: 0 0 8px; font-size: .85rem; color: var(--text-soft); }
.post-card-summary { margin: 0 0 12px; color: var(--text-soft); font-size: .96rem; }

.tag-row { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: .78rem; color: var(--accent); background: var(--accent-soft);
  padding: 2px 9px; border-radius: 999px; line-height: 1.7;
}
.tag:hover { text-decoration: none; filter: brightness(.95); }
.tag-count { color: var(--text-soft); font-size: .8rem; }

/* ---------------- pager ---------------- */
.pager { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 34px; font-size: .93rem; }
.pager-link { padding: 7px 14px; border: 1px solid var(--border); border-radius: 999px; color: var(--text); }
.pager-link:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.pager-link.is-disabled { color: var(--text-soft); opacity: .5; }
.pager-info { color: var(--text-soft); font-size: .85rem; }

/* ---------------- single post ---------------- */
.post-header { margin-bottom: 26px; }
.post-title { font-size: 2.05rem; line-height: 1.32; margin: 0 0 10px; letter-spacing: -.015em; }
.post-meta { margin: 0 0 12px; color: var(--text-soft); font-size: .88rem; }

.post-content { font-size: 1.02rem; }
.post-content > *:first-child { margin-top: 0; }
.post-content h2 { font-size: 1.42rem; margin: 2.1em 0 .7em; padding-bottom: .3em; border-bottom: 1px solid var(--border); }
.post-content h3 { font-size: 1.16rem; margin: 1.7em 0 .6em; }
.post-content h4 { font-size: 1.02rem; margin: 1.5em 0 .5em; }
.post-content p { margin: 1.05em 0; }
.post-content ul, .post-content ol { padding-left: 1.5em; margin: 1em 0; }
.post-content li { margin: .35em 0; }
.post-content li input[type="checkbox"] { margin-right: .45em; }
.post-content img { max-width: 100%; height: auto; border-radius: 10px; display: block; margin: 1.4em auto; }
.post-content blockquote {
  margin: 1.3em 0; padding: .6em 1.1em; color: var(--text-soft);
  border-left: 3px solid var(--accent); background: var(--bg-soft); border-radius: 0 10px 10px 0;
}
.post-content blockquote p { margin: .4em 0; }
.post-content hr { border: 0; border-top: 1px solid var(--border); margin: 2.4em 0; }
.post-content code {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  font-size: .88em; background: var(--code-bg); border: 1px solid var(--border);
  padding: .12em .4em; border-radius: 6px;
}
.post-content pre {
  margin: 0; padding: 16px 18px; overflow-x: auto; background: var(--code-bg);
  border: 1px solid var(--border); border-radius: 0 0 var(--radius) var(--radius);
  font-size: .87rem; line-height: 1.62;
}
.post-content pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.code-block { position: relative; margin: 1.4em 0; border-radius: var(--radius); }
.code-bar {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  background: var(--bg-soft); border: 1px solid var(--border); border-bottom: 0;
  border-radius: var(--radius) var(--radius) 0 0; padding: 6px 12px;
  font-size: .76rem; color: var(--text-soft);
  font-family: ui-monospace, SFMono-Regular, Consolas, Menlo, monospace;
}
.copy-btn {
  border: 1px solid var(--border); background: var(--surface); color: var(--text-soft);
  font-size: .74rem; padding: 2px 9px; border-radius: 999px; cursor: pointer;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.copy-btn.is-done { color: #1a7f37; border-color: #1a7f37; }

.post-content table { width: 100%; border-collapse: collapse; margin: 1.4em 0; font-size: .95rem; display: block; overflow-x: auto; }
.post-content th, .post-content td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.post-content th { background: var(--bg-soft); font-weight: 600; }

.toc { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; margin: 0 0 30px; }
.toc-title { margin: 0 0 8px; font-size: .85rem; color: var(--text-soft); letter-spacing: .08em; }
.toc ul { list-style: none; margin: 0; padding: 0; font-size: .93rem; }
.toc ul ul { padding-left: 16px; }
.toc li { margin: 4px 0; }
.toc a { color: var(--text-soft); }
.toc a:hover { color: var(--accent); }

.post-footer { margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--border); font-size: .85rem; }
.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 26px; }
.post-nav-link {
  display: flex; flex-direction: column; gap: 2px; padding: 14px 16px; border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text); font-size: .95rem; line-height: 1.5;
}
.post-nav-link:hover { border-color: var(--accent); text-decoration: none; }
.post-nav-link.next { text-align: right; }
.post-nav-label { font-size: .78rem; color: var(--text-soft); }
.post-nav-link.is-empty { border: 0; padding: 0; }

/* ---------------- tags / archive / search ---------------- */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-cloud .tag { font-size: .92rem; padding: 5px 13px; }
.archive-list { list-style: none; padding: 0; margin: 0; }
.archive-list li { display: flex; gap: 14px; align-items: baseline; padding: 11px 0; border-bottom: 1px dashed var(--border); }
.archive-date { color: var(--text-soft); font-size: .85rem; min-width: 96px; font-variant-numeric: tabular-nums; }
.archive-tags { margin-left: auto; font-size: .8rem; color: var(--text-soft); }
.year-heading { font-size: 1.1rem; margin: 30px 0 6px; color: var(--text-soft); }

.search-box { display: flex; gap: 10px; margin-bottom: 8px; }
.search-box input {
  flex: 1; padding: 11px 15px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--surface); color: var(--text); font-size: 1rem; font-family: inherit;
}
.search-box input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.search-hint { color: var(--text-soft); font-size: .85rem; margin: 0 0 24px; }
.search-result { padding: 16px 0; border-bottom: 1px solid var(--border); }
.search-result h3 { margin: 0 0 4px; font-size: 1.1rem; }
.search-result p { margin: 4px 0 0; color: var(--text-soft); font-size: .93rem; }
.search-result mark { background: var(--accent-soft); color: var(--accent); padding: 0 2px; border-radius: 4px; }

.button {
  display: inline-block; background: var(--accent); color: #fff; padding: 9px 18px;
  border-radius: 999px; font-size: .94rem;
}
.button:hover { text-decoration: none; filter: brightness(1.07); }

.empty-state { text-align: center; padding: 60px 0; }
.empty-state .page-title { font-size: 4rem; margin-bottom: 6px; }

/* ---------------- footer ---------------- */
.site-footer { border-top: 1px solid var(--border); padding: 26px 0 40px; font-size: .86rem; color: var(--text-soft); }
.site-footer p { margin: 4px 0; }

/* ---------------- responsive ---------------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .header-inner { height: auto; padding: 10px 0; flex-wrap: wrap; }
  .site-nav { gap: 2px; margin-left: 0; width: 100%; order: 3; }
  .nav-link { padding: 4px 8px; font-size: .88rem; }
  .theme-toggle { margin-left: auto; }
  main { padding: 28px 20px 48px; }
  .post-title { font-size: 1.62rem; }
  .page-title { font-size: 1.55rem; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav-link.next { text-align: left; }
  .archive-list li { flex-wrap: wrap; gap: 4px 12px; }
  .archive-tags { margin-left: 0; }
}

@media print {
  .site-header, .site-footer, .toc, .post-nav, .copy-btn, .code-bar { display: none; }
  body { font-size: 12pt; }
}