:root { --primary:#3b82f6; --primary-hover:#2563eb; --bg:#ffffff; --bg-soft:#f8fafc; --fg:#1f2937; --muted:#64748b; --border:#e5e7eb; --code-bg:#f6f8fa; --container:1100px; --reading:760px; }
@media (prefers-color-scheme: dark) {
  :root { --primary:#58a6ff; --primary-hover:#8ec2ff; --bg:#0d1117; --bg-soft:#161b22; --fg:#c9d1d9; --muted:#8b949e; --border:#30363d; --code-bg:#161b22; }
  .site-header { background:rgba(13,17,23,0.55); }
  .mobile-menu { background:rgba(13,17,23,0.92); }
  .profile-card, .ask-card { background:rgba(22,27,34,0.45); }
  #search-input { background:rgba(22,27,34,0.6); }
}
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; background:var(--bg) url('/images/bg.jpg') center/cover no-repeat fixed; color:var(--fg); font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif; line-height:1.75; }
body::before { content:''; position:fixed; inset:0; z-index:-1; background:rgba(255,255,255,0.66); }
@media (max-width: 768px) { body { background-attachment: scroll; } }
@media (prefers-color-scheme: dark) { body::before { background:rgba(13,17,23,0.78); } }
a { color:var(--primary); text-decoration:none; }
a:hover { color:var(--primary-hover); }
.container { width:100%; max-width:var(--container); margin:0 auto; padding-left:24px; padding-right:24px; }

/* ===== header ===== */
.site-header { position:sticky; top:0; z-index:50; border-bottom:1px solid var(--border); background:rgba(255,255,255,0.55); backdrop-filter:blur(14px) saturate(1.5); -webkit-backdrop-filter:blur(14px) saturate(1.5); }
.header-inner { height:72px; display:flex; align-items:center; justify-content:space-between; gap:20px; }
.site-title { font-size:21px; font-weight:700; color:var(--fg); white-space:nowrap; }
.site-title:hover { color:var(--primary); }
.desktop-nav { display:flex; align-items:center; gap:26px; }
.desktop-nav a { color:var(--muted); font-size:15px; }
.desktop-nav a:hover { color:var(--primary); }
.search-box { position:relative; }
.search-icon { position:absolute; left:.65rem; top:50%; transform:translateY(-50%); width:14px; height:14px; color:var(--muted); pointer-events:none; }
#search-input { width:210px; padding:.45rem .8rem .45rem 2.1rem; border:1px solid var(--border); border-radius:10px; background:rgba(255,255,255,0.5); color:var(--fg); font-size:14px; outline:none; transition:border-color .2s ease; }
#search-input:focus { border-color:var(--primary); }
#search-results { display:none; position:absolute; right:0; top:2.7rem; background:var(--bg); border:1px solid var(--border); border-radius:10px; min-width:280px; max-height:320px; overflow-y:auto; z-index:10; padding:.4rem; box-shadow:0 8px 24px rgba(0,0,0,.08); }
#search-results a { display:block; padding:.45rem .55rem; border-radius:6px; color:var(--fg); font-size:14px; }
#search-results a:hover { background:var(--bg-soft); color:var(--primary); }
.icon-button { display:none; border:none; background:transparent; cursor:pointer; padding:8px; color:var(--fg); }
.mobile-menu { display:none; position:absolute; top:100%; left:0; right:0; z-index:60; flex-direction:column; padding:6px 24px 14px; border-bottom:1px solid var(--border); background:rgba(255,255,255,0.92); backdrop-filter:blur(14px) saturate(1.5); -webkit-backdrop-filter:blur(14px) saturate(1.5); box-shadow:0 14px 30px rgba(0,0,0,.12); }
.mobile-menu.show { display:flex; animation:menu-in .18s ease; }
@keyframes menu-in { from { opacity:0; transform:translateY(-8px); } to { opacity:1; transform:none; } }
.mobile-menu a { padding:12px 0; color:var(--fg); font-size:15px; border-bottom:1px solid var(--border); }
.mobile-menu a:last-child { border-bottom:none; }

/* ===== main layout ===== */
main { padding-top:8px; padding-bottom:40px; min-height:60vh; }
main > h1 { font-size:26px; padding-top:28px; margin-bottom:20px; }
.intro { padding:28px 0 6px; }
.intro p { margin:0; color:var(--muted); font-size:15px; }
.layout { display:grid; grid-template-columns:minmax(0,1fr) 280px; gap:56px; align-items:start; }

/* ===== post list ===== */
.post-list { min-width:0; }
.post-item { padding:28px 0; border-bottom:1px solid var(--border); }
.post-item:first-child { padding-top:6px; }
.post-item h1, .post-item h2 { margin:0 0 10px; font-size:26px; line-height:1.35; }
.post-item h1 a, .post-item h2 a { color:var(--primary); }
.post-item h1 a:hover, .post-item h2 a:hover { color:var(--primary-hover); }
.post-meta { display:flex; align-items:center; flex-wrap:wrap; gap:8px; color:var(--muted); font-size:14px; }
a.tag { display:inline-block; padding:3px 10px; border:1px solid var(--border); border-radius:999px; background:var(--bg-soft); color:var(--muted); font-size:13px; }
a.tag:hover { color:var(--primary); border-color:var(--primary); }
.post-desc { margin:14px 0 0; color:var(--muted); font-size:15.5px; line-height:1.8; }

/* ===== paid articles ===== */
.paid-badge { display:inline-block; padding:2px 10px; border-radius:999px; background:var(--primary); color:#fff; font-size:12.5px; }
.tag-paid { border-color:var(--primary); color:var(--primary); background:transparent; }
.paywall { position:relative; margin-top:-40px; }
.paywall-card { position:relative; border:1px solid var(--border); border-radius:14px; padding:26px 24px; text-align:center; background:var(--bg-soft); }
.paywall-price { color:var(--primary); font-size:20px; }
.paywall-hint { color:var(--muted); font-size:13.5px; margin:10px 0 0; }
.paywall-row { display:flex; gap:10px; justify-content:center; margin:16px 0 4px; flex-wrap:wrap; }
.paywall-row input { padding:.5rem .8rem; border:1px solid var(--border); border-radius:10px; font-size:14px; width:220px; background:var(--bg); color:var(--fg); outline:none; }
.paywall-row input:focus { border-color:var(--primary); }
.paywall-row button { padding:.5rem 1.3rem; border:none; border-radius:10px; background:var(--primary); color:#fff; font-size:14px; cursor:pointer; }
.paywall-row button:hover { background:var(--primary-hover); }
.paywall-msg { color:#e5534b; font-size:13px; min-height:18px; margin:6px 0 0; }
.paywall-state { color:var(--muted); font-size:13px; margin:2px 0 0; }

/* ===== sidebar ===== */
.sidebar { border-left:1px solid var(--border); padding-left:32px; }
.profile-card { display:flex; gap:14px; padding:18px; background:rgba(255,255,255,0.42); backdrop-filter:blur(10px) saturate(1.4); -webkit-backdrop-filter:blur(10px) saturate(1.4); border:1px solid var(--border); border-radius:14px; }
.avatar { width:44px; height:44px; flex-shrink:0; display:flex; align-items:center; justify-content:center; border-radius:50%; color:#fff; background:var(--primary); font-size:17px; }
.profile-card strong { font-size:15px; color:var(--fg); }
.profile-card p { margin:6px 0 0; color:var(--muted); font-size:13px; line-height:1.6; }
.sidebar-section { margin-top:32px; }
.sidebar-section h3 { margin:0 0 14px; font-size:15px; color:var(--fg); }
.tag-list { display:flex; flex-wrap:wrap; gap:8px; }
.tag-list a { padding:5px 11px; border-radius:999px; background:var(--bg-soft); border:1px solid var(--border); color:var(--muted); font-size:13px; }
.tag-list a:hover { color:var(--primary); border-color:var(--primary); }
.recent-posts { margin:0; padding:0; list-style:none; }
.recent-posts li { margin-bottom:16px; }
.recent-posts a { display:block; color:var(--fg); font-size:14px; line-height:1.5; }
.recent-posts a:hover { color:var(--primary); }
.recent-posts span { display:block; margin-top:3px; font-size:12px; color:var(--muted); }

/* ===== contact CTA card ===== */
.ask-card { margin-top:44px; padding:22px 24px; display:flex; align-items:center; gap:18px; flex-wrap:wrap; border:1px solid var(--border); border-radius:16px; background:rgba(255,255,255,0.42); backdrop-filter:blur(10px) saturate(1.4); -webkit-backdrop-filter:blur(10px) saturate(1.4); }
.ask-content { flex:1; min-width:220px; }
.ask-content h3 { margin:0; font-size:16px; color:var(--fg); }
.ask-content p { margin:6px 0 0; color:var(--muted); font-size:14px; }
.ask-button { flex-shrink:0; padding:10px 20px; border-radius:999px; background:var(--primary); color:#fff; font-size:14px; transition:background .2s ease; }
.ask-button:hover { background:var(--primary-hover); color:#fff; }

/* ===== article page ===== */
.post-content { max-width:var(--reading); margin:0 auto; padding-top:32px; }
/* ===== contact page ===== */
.tally-wrap { position:relative; min-height:380px; margin-top:20px; }
.tally-loading { position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center; gap:14px; color:var(--text-light); font-size:14px; }
.tally-loading .tally-spinner { width:26px; height:26px; border-radius:50%; border:3px solid var(--border); border-top-color:var(--primary); animation:tally-spin .8s linear infinite; }
@keyframes tally-spin { to { transform:rotate(360deg); } }
.tally-wrap.tally-loaded .tally-loading { display:none; }
.tally-wrap iframe { background:transparent; }
.post-content h1 { font-size:30px; line-height:1.35; margin:0 0 14px; }
.markdown-body { margin-top:26px; font-size:16px; }
.markdown-body img { max-width:100%; border-radius:8px; }
.markdown-body pre { background:var(--code-bg); padding:1rem; overflow-x:auto; border-radius:8px; border:1px solid var(--border); }
.markdown-body code { background:var(--code-bg); padding:.1rem .35rem; border-radius:4px; font-size:.9em; }
.markdown-body pre code { background:none; padding:0; }
.markdown-body blockquote { border-left:4px solid var(--border); margin:0; padding-left:1rem; color:var(--muted); }
.markdown-body table { border-collapse:collapse; width:100%; }
.markdown-body th, .markdown-body td { border:1px solid var(--border); padding:.5rem .7rem; }
.post-nav { display:flex; justify-content:space-between; margin-top:3rem; padding-top:1rem; border-top:1px solid var(--border); }
.tag-cloud .tag { font-size:1rem; margin:.3rem; padding:.35rem .85rem; }
.comments { max-width:var(--reading); margin:2.5rem auto 0; }
.comments h2 { font-size:20px; }

/* ===== footer ===== */
.site-footer { border-top:1px solid var(--border); text-align:center; color:var(--muted); padding:26px 0; font-size:13px; }
.site-footer p { margin:0; }

/* ===== responsive ===== */
@media (max-width:820px) {
  .layout { display:block; }
  .sidebar { display:none; }
  .desktop-nav { display:none; }
  .icon-button { display:block; }
  .post-item h1, .post-item h2 { font-size:23px; }
}
@media (max-width:560px) {
  .container { padding-left:16px; padding-right:16px; }
  .header-inner { height:60px; }
  .search-box { display:none; }
  .mobile-menu { padding-left:16px; padding-right:16px; }
  .post-content h1 { font-size:25px; }
  .intro { padding-top:20px; }
  .ask-card { margin-top:32px; padding:18px; }
  .ask-button { width:100%; text-align:center; }
}