:root {
  --bg: #0f1419;
  --bg-soft: #161d26;
  --bg-code: #0b0f14;
  --fg: #dbe2ea;
  --fg-muted: #8b98a5;
  --accent: #4aa3ff;
  --accent-dim: #2f6fb0;
  --border: #26303c;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  line-height: 1.7;
}

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

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* header / nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
}
.logo { font-weight: 700; letter-spacing: 0.5px; color: var(--fg); font-size: 1.05rem; }
.logo:hover { text-decoration: none; color: var(--accent); }
.nav-links { display: flex; gap: 20px; }
.nav-links a { color: var(--fg-muted); font-size: 0.95rem; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--fg); text-decoration: none; }
.nav-links a[aria-current="page"] { border-bottom: 2px solid var(--accent); padding-bottom: 2px; }

.main { min-height: calc(100vh - 170px); padding: 28px 20px 60px; }

/* hero / headings */
.hero h1 { margin: 0 0 6px; font-size: 1.7rem; }
.hero { padding: 8px 0 6px; }
.muted { color: var(--fg-muted); }
.page-head { margin-bottom: 18px; }
.page-head h1 { margin: 0 0 4px; font-size: 1.5rem; }
.page-head h1 .tag { font-size: inherit; }
.post-head h1 { font-size: 1.7rem; margin: 4px 0 10px; line-height: 1.35; }
.crumbs { margin: 0 0 10px; font-size: 0.9rem; }
.post-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; color: var(--fg-muted); font-size: 0.9rem; }
.post-head { border-bottom: 1px solid var(--border); padding-bottom: 16px; margin-bottom: 22px; }

/* search */
.searchbar { display: flex; gap: 8px; margin: 18px 0 26px; }
.searchbar input {
  flex: 1;
  padding: 9px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg);
  font-family: inherit;
  font-size: 0.95rem;
}
.searchbar input:focus { outline: none; border-color: var(--accent-dim); }

.btn {
  display: inline-block;
  background: var(--accent-dim);
  color: #fff;
  border: 1px solid transparent;
  padding: 9px 18px;
  border-radius: var(--radius);
  font: inherit;
  font-size: 0.95rem;
  cursor: pointer;
}
.btn:hover { background: var(--accent); text-decoration: none; }
.btn.ghost { background: transparent; border-color: var(--border); color: var(--fg-muted); }
.btn.ghost:hover { color: var(--fg); border-color: var(--accent-dim); }

/* cards */
.cards-wrap { display: flex; flex-direction: column; gap: 16px; }
.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}
.post-card { transition: border-color 0.15s ease; }
.post-card:hover { border-color: var(--accent-dim); }
.card-head { display: flex; align-items: center; gap: 10px; color: var(--fg-muted); font-size: 0.82rem; }
.card-title { margin: 6px 0 4px; font-size: 1.15rem; }
.card-title a { color: var(--fg); }
.card-title a:hover { color: var(--accent); text-decoration: none; }
.card-summary { margin: 0 0 10px; color: var(--fg-muted); font-size: 0.95rem; }
.card-meta { display: flex; flex-wrap: wrap; gap: 6px; }

/* tags */
.tag {
  display: inline-block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 10px;
  font-size: 0.78rem;
  color: var(--accent);
  white-space: nowrap;
}
.tag:hover { border-color: var(--accent-dim); text-decoration: none; }
.tag.chip { padding: 4px 12px; font-size: 0.88rem; margin: 0 6px 8px 0; }
.tag-cloud { margin: 0; }
.count { color: var(--fg-muted); margin-left: 4px; font-size: 0.75rem; }
.badge {
  display: inline-block;
  color: #f0b27a;
  border: 1px solid #7a4d22;
  background: #2a2015;
  border-radius: 999px;
  padding: 0 10px;
  font-size: 0.76rem;
  white-space: nowrap;
}

/* load more / pager */
.loadmore { text-align: center; margin: 22px 0 0; }
.page-info { text-align: center; margin: 14px 0 0; }
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 18px; }
.pager.only-next { justify-content: flex-end; }
.neighbors { margin-top: 34px; padding-top: 18px; border-top: 1px solid var(--border); }
.neighbor { display: flex; flex-direction: column; gap: 2px; max-width: 46%; font-size: 0.92rem; }
.neighbor-label { color: var(--fg-muted); font-size: 0.8rem; }

/* markdown body */
.markdown-body > :first-child { margin-top: 0; }
.markdown-body pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  overflow-x: auto;
  line-height: 1.55;
}
.markdown-body code {
  font-family: var(--mono);
  font-size: 0.88em;
}
.markdown-body :not(pre) > code {
  background: #1d2733;
  padding: 1px 6px;
  border-radius: 6px;
}
.markdown-body pre code { background: none; padding: 0; }
.markdown-body img { max-width: 100%; border-radius: var(--radius); }
.markdown-body table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 0.92rem; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 7px 12px; text-align: left; }
.markdown-body th { background: var(--bg-soft); }
.markdown-body blockquote {
  margin: 14px 0;
  padding: 2px 16px;
  border-left: 3px solid var(--accent-dim);
  color: var(--fg-muted);
  background: var(--bg-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.markdown-body h2 { font-size: 1.35rem; margin: 28px 0 10px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.markdown-body h3 { font-size: 1.12rem; margin: 22px 0 8px; }
.markdown-body h4 { font-size: 1rem; margin: 18px 0 6px; }
.markdown-body li { margin: 3px 0; }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 26px 0; }

/* misc */
.empty { color: var(--fg-muted); text-align: center; padding: 30px 0; }
.more-link { margin-top: 14px; text-align: center; }
.topics { margin-top: 40px; }
.topics h2 { font-size: 1.1rem; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.nf { text-align: center; padding: 60px 0; }
.nf h1 { font-size: 3rem; margin: 0 0 6px; }
.foot { display: flex; justify-content: space-between; color: var(--fg-muted); font-size: 0.85rem; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 22px 0;
  color: var(--fg-muted);
}

@media (max-width: 620px) {
  .nav { flex-direction: column; height: auto; gap: 6px; padding: 10px 0; }
  .main { padding-top: 20px; }
  .pager { flex-direction: column; }
  .neighbor { max-width: 100%; }
}

/* auth */
.nav-account { display: inline-flex; align-items: center; gap: 10px; }
.nav-account .whoami { color: var(--fg); font-size: 0.9rem; }
form.inline { display: inline; margin: 0; }
button.linkish {
  background: none; border: none; padding: 0;
  color: var(--fg-muted); cursor: pointer; font: inherit; font-size: 0.95rem;
}
button.linkish:hover { color: var(--accent); text-decoration: underline; }
button.linkish.danger:hover { color: #ff6b6b; }
.auth-card { max-width: 420px; margin: 20px auto; background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 30px; }
.auth-card h1 { margin: 0 0 16px; font-size: 1.35rem; }
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-form label { display: flex; flex-direction: column; gap: 6px; font-size: 0.9rem; color: var(--fg-muted); }
.auth-form input { padding: 9px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); color: var(--fg); font: inherit; }
.auth-form input:focus { outline: none; border-color: var(--accent-dim); }
.flash.error {
  color: #ff9a9a; background: #2a1616; border: 1px solid #6e2626;
  padding: 8px 14px; border-radius: var(--radius); font-size: 0.92rem; margin: 0 0 14px;
}
.auth-card p.muted { margin: 14px 0 0; font-size: 0.88rem; }

/* comments */
.comments { margin-top: 42px; }
.section-title { font-size: 1.15rem; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.comments-list { list-style: none; margin: 18px 0; padding: 0; display: flex; flex-direction: column; gap: 14px; }
.comment { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 16px; }
.comment-head { display: flex; align-items: center; gap: 10px; font-size: 0.85rem; color: var(--fg-muted); }
.comment-head time { margin-right: auto; }
.comment-name { color: var(--accent); }
.comment-body { margin-top: 6px; font-size: 0.95rem; word-break: break-word; white-space: pre-wrap; }
.comment-form { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }
.comment-form textarea, .admin-form textarea, .admin-form input {
  width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--fg); font: inherit; padding: 9px 12px; box-sizing: border-box;
}
.comment-form textarea:focus, .admin-form textarea:focus, .admin-form input:focus { outline: none; border-color: var(--accent-dim); }
.form-actions { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.auth-hint { color: var(--fg-muted); padding: 10px 0; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* admin console */
.tabs { display: flex; gap: 6px; margin: 6px 0 22px; }
.tabs a {
  color: var(--fg-muted); border: 1px solid var(--border); border-radius: 999px;
  padding: 4px 14px; font-size: 0.9rem;
}
.tabs a.on, .tabs a:hover { color: var(--fg); border-color: var(--accent-dim); text-decoration: none; }
.admin-table { width: 100%; border-collapse: collapse; background: var(--bg-soft); }
.admin-table th, .admin-table td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; vertical-align: middle; }
.admin-table th { background: #1a222c; }
.row-actions { white-space: nowrap; display: flex; gap: 8px; align-items: center; }
.btn.small { padding: 4px 12px; font-size: 0.85rem; }
.btn.danger:hover { background: #a83232; }
.editor-card { display: flex; gap: 24px; align-items: flex-start; flex-wrap: wrap; }
.editor-card form { flex: 1 1 480px; display: flex; flex-direction: column; gap: 14px; }
.editor-card form label { display: flex; flex-direction: column; gap: 6px; font-size: 0.9rem; color: var(--fg-muted); }
.editor-card form label.check { flex-direction: row; align-items: center; gap: 8px; }
.editor-card form label.check input { width: auto; }
.admin-preview { flex: 0 1 420px; min-width: 320px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 6px 18px 18px; }
.admin-preview h3 { font-size: 0.95rem; color: var(--fg-muted); border-bottom: 1px solid var(--border); padding-bottom: 6px; }

.lang-switch { margin-right: 4px; }
.lang-switch a { color: var(--fg-muted); font-size: 0.85rem; border: 1px solid var(--border); padding: 2px 8px; border-radius: 999px; }
.lang-switch a:hover { color: var(--fg); border-color: var(--accent-dim); text-decoration: none; }
.editor-card h2.en-block { font-size: 1.02rem; border-top: 1px dashed var(--border); padding-top: 16px; margin: 6px 0 0; }