/* ==================================================================
   赫兹博客 · 样式
   视觉语言参考「非哥工具箱」：暖白米色渐变 + 毛玻璃 + 圆角卡片 + 柔和阴影
   ================================================================== */

* { box-sizing: border-box; }

:root {
  --layout-width: 1140px;
  --radius: 18px;
  --radius-lg: 26px;

  /* 浅色主题 */
  --body-bg: radial-gradient(circle at top right, #ffddcc52, transparent 24%), linear-gradient(180deg, #fbfaf7 0%, #f6f3ee 100%);
  --paper: #faf8f3;
  --paper-strong: #fff;
  --ink-strong: #121a22;
  --ink-mid: #384654;
  --ink-soft: #78828d;
  --line: #121a221a;
  --header-bg: #faf8f3db;
  --surface: #ffffffcc;
  --surface-strong: #ffffffeb;
  --surface-elevated: #fbf9f4fa;
  --control-bg: #ffffffd1;
  --control-border: #121a2214;
  --card-border: #121a2214;
  --card-shadow: 0 18px 36px #121a220f;
  --card-shadow-strong: 0 32px 80px #0e141b2e;
  --chip-muted: #121a2214;
  --tag-bg: #121a220d;
  --accent: #0f5d8f;
  --accent-warm: #e0702f;
  --accent-red: #f44336;
  --accent-cyan: #2196f3;
  --glow: #5786ff2e;
  --hero-bg: linear-gradient(135deg, #ffdacdf0, #cde8fae6);
  --footer-bg: #f3efe8;
}

:root[data-theme="dark"] {
  --body-bg: radial-gradient(circle at top center, #6d95ff2e, transparent 28%), linear-gradient(180deg, #0a1017 0%, #0d141d 100%);
  --paper: #0b1117;
  --paper-strong: #101923;
  --ink-strong: #eef4fb;
  --ink-mid: #c7d1db;
  --ink-soft: #92a1b1;
  --line: #e0eaf41f;
  --header-bg: #0a1017db;
  --surface: #101923cc;
  --surface-strong: #101923eb;
  --surface-elevated: #0d141d fa;
  --control-bg: #101923d1;
  --control-border: #e0eaf414;
  --card-border: #e0eaf41f;
  --card-shadow: 0 18px 36px #00000033;
  --card-shadow-strong: 0 32px 80px #00000055;
  --chip-muted: #e0eaf414;
  --tag-bg: #e0eaf41f;
  --accent: #5b9bd5;
  --accent-warm: #f0934d;
  --accent-red: #ef5350;
  --accent-cyan: #4fc3f7;
  --glow: #6d95ff2e;
  --hero-bg: linear-gradient(135deg, #2a1f1a, #122a3a);
  --footer-bg: #080d13;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--body-bg);
  color: var(--ink-strong);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
  transition: background .4s ease, color .4s ease;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* ---------- 背景光晕 ---------- */
.bg-orbs { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.orb { position: absolute; border-radius: 50%; filter: blur(80px); opacity: .5; }
.orb-a { width: 420px; height: 420px; top: -120px; right: -80px; background: #ffddcc66; }
.orb-b { width: 380px; height: 380px; top: 40%; left: -140px; background: #cde8fa55; }
.orb-c { width: 320px; height: 320px; bottom: -100px; right: 20%; background: #e8dcf566; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  background: var(--header-bg);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: var(--layout-width); margin: 0 auto;
  padding: 0 24px; height: 68px;
  display: flex; align-items: center; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 12px;
  background: linear-gradient(135deg, #0f5d8f, #2196f3);
  color: #fff; display: grid; place-items: center;
  font-size: 20px; font-weight: 700;
  box-shadow: 0 6px 16px #0f5d8f40;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 17px; }
.brand-text small { font-size: 11px; color: var(--ink-soft); letter-spacing: .5px; }

.nav { display: flex; gap: 6px; margin-left: 8px; }
.nav-link {
  padding: 8px 14px; border-radius: 10px;
  font-size: 14px; color: var(--ink-mid);
  transition: all .2s;
}
.nav-link:hover { background: var(--chip-muted); color: var(--ink-strong); }
.nav-link.active { background: var(--chip-muted); color: var(--ink-strong); font-weight: 600; }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 12px;
  display: grid; place-items: center;
  color: var(--ink-mid);
  border: 1px solid var(--control-border);
  background: var(--control-bg);
  transition: all .2s;
}
.icon-btn:hover { color: var(--ink-strong); transform: translateY(-1px); box-shadow: var(--card-shadow); }
.icon-btn.round { border-radius: 50%; }

/* ---------- 社交账号图标 ---------- */
.social-links { display: flex; align-items: center; gap: 8px; }
.social-btn {
  width: 36px; height: 36px; border-radius: 11px;
  display: grid; place-items: center;
  color: #fff;
  transition: transform .2s ease, box-shadow .2s ease;
  flex: none;
}
.social-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(0, 0, 0, .22); }
.social-btn:active { transform: translateY(0); }
.social-btn svg { width: 19px; height: 19px; display: block; }
.social-btn.douyin { background: #161823; }
.social-btn.bilibili { background: #FB7299; }
.social-btn.xiaohongshu { background: #FF2442; }
.social-btn.wechat { background: #07C160; }

/* ---------- 顶栏搜索胶囊 ---------- */
.search-pill {
  display: flex; align-items: center; gap: 8px;
  height: 40px; width: 220px;
  padding: 0 16px;
  border-radius: 999px;
  background: var(--control-bg);
  border: 1px solid var(--control-border);
  transition: all .2s;
}
.search-pill:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--glow); }
.search-pill svg { color: var(--ink-soft); flex: none; }
.search-pill input {
  flex: 1; min-width: 0;
  border: none; background: none; outline: none;
  font-size: 14px; color: var(--ink-strong);
  font-family: inherit;
}
.search-pill input::placeholder { color: var(--ink-soft); }

/* 桌面端用胶囊搜索，隐藏放大镜按钮 */
#search-toggle { display: none; }

/* 微信号展示 */
.wechat-id {
  font-size: 20px; letter-spacing: 1px;
  padding: 4px 14px; border-radius: 10px;
  background: var(--tag-bg); color: var(--accent);
}

[data-theme="light"] .ico-moon { display: none; }
[data-theme="dark"] .ico-sun { display: none; }

/* ---------- 搜索条 ---------- */
.search-bar {
  position: fixed; top: 68px; left: 0; right: 0; z-index: 49;
  padding: 12px 24px;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  transform: translateY(-120%);
  transition: transform .3s ease;
}
.search-bar.open { transform: translateY(0); }
.search-inner {
  max-width: 640px; margin: 0 auto;
  display: flex; align-items: center; gap: 10px;
  background: var(--control-bg);
  border: 1px solid var(--control-border);
  border-radius: 14px; padding: 10px 16px;
  box-shadow: var(--card-shadow);
}
.search-inner svg { color: var(--ink-soft); flex: none; }
.search-inner input {
  flex: 1; border: none; background: none; outline: none;
  font-size: 15px; color: var(--ink-strong);
}
.search-close { color: var(--ink-soft); font-size: 16px; padding: 4px; }

/* ---------- Hero ---------- */
.hero { padding: 56px 24px 40px; }
.hero-inner {
  max-width: var(--layout-width); margin: 0 auto;
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center;
}
.hero-eyebrow {
  display: inline-block; font-size: 12px; letter-spacing: 2px;
  color: var(--accent); font-weight: 600;
  margin-bottom: 14px;
}
.hero-title {
  font-size: clamp(34px, 5vw, 52px); line-height: 1.15; margin: 0 0 12px;
  letter-spacing: -1px;
}
.hero-sub {
  font-size: 17px; color: var(--accent-warm); font-weight: 600; margin: 0 0 8px;
}
.hero-desc { font-size: 15px; color: var(--ink-mid); max-width: 480px; margin: 0 0 26px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 12px;
  font-size: 15px; font-weight: 600;
  transition: all .2s;
}
.btn-primary {
  background: linear-gradient(135deg, #0f5d8f, #2196f3);
  color: #fff; box-shadow: 0 8px 20px var(--glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px var(--glow); }
.btn-ghost {
  border: 1px solid var(--control-border);
  background: var(--control-bg); color: var(--ink-mid);
}
.btn-ghost:hover { color: var(--ink-strong); border-color: var(--line); }

.hero-visual { position: relative; min-height: 240px; }
.hero-card {
  position: absolute; background: var(--surface-strong);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow-strong);
  padding: 22px;
  display: flex; flex-direction: column; gap: 10px;
}
.hero-card-main { width: 78%; top: 20px; right: 0; transform: rotate(1.5deg); }
.hero-card-main strong { font-size: 19px; }
.hero-card-main small { color: var(--ink-mid); font-size: 13px; }
.hc-tag {
  align-self: flex-start; font-size: 12px; padding: 3px 10px;
  background: var(--tag-bg); border-radius: 999px; color: var(--ink-mid);
}
.hero-card-float {
  flex-direction: row; align-items: center; gap: 8px;
  bottom: 8px; left: 0; padding: 12px 16px; font-size: 13px;
  transform: rotate(-2deg);
}
.hc-dot { width: 8px; height: 8px; border-radius: 50%; background: #22c55e; box-shadow: 0 0 0 3px #22c55e33; }

/* ---------- 标签筛选 ---------- */
.tags-strip {
  max-width: var(--layout-width); margin: 0 auto; padding: 8px 24px 24px;
  display: flex; gap: 10px; flex-wrap: wrap;
}
.tag-chip {
  padding: 8px 16px; border-radius: 999px;
  font-size: 14px; color: var(--ink-mid);
  background: var(--surface);
  border: 1px solid var(--control-border);
  transition: all .2s;
}
.tag-chip:hover { color: var(--ink-strong); border-color: var(--line); }
.tag-chip.active {
  background: var(--ink-strong); color: var(--paper-strong);
  border-color: transparent;
}

/* ---------- 文章列表 ---------- */
.posts { max-width: var(--layout-width); margin: 0 auto; padding: 12px 24px 40px; }
.section-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 22px; }
.section-head h2 { margin: 0; font-size: 22px; }
.section-note { font-size: 13px; color: var(--ink-soft); }

.posts-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.post-card {
  position: relative; display: flex; flex-direction: column; gap: 12px;
  background: var(--surface-strong);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--card-shadow);
  transition: transform .25s ease, box-shadow .25s ease;
  overflow: hidden;
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-strong); }
.post-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, #0f5d8f, #2196f3, #e0702f);
  opacity: 0; transition: opacity .25s;
}
.post-card:hover::before { opacity: 1; }

.post-card-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.post-date { font-size: 12px; color: var(--ink-soft); }
.featured-flag {
  font-size: 11px; padding: 2px 8px; border-radius: 6px;
  background: #e0702f1a; color: var(--accent-warm); font-weight: 600;
}

.post-card-title { font-size: 17px; font-weight: 700; line-height: 1.4; margin: 0; }
.post-card-excerpt {
  font-size: 14px; color: var(--ink-mid); margin: 0;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}

.post-card-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: auto; padding-top: 4px; }
.mini-tag {
  font-size: 12px; padding: 3px 10px; border-radius: 999px;
  background: var(--tag-bg); color: var(--ink-mid);
}

.empty { text-align: center; padding: 60px 0; color: var(--ink-soft); }

/* ---------- 分页 ---------- */
.pagination {
  max-width: var(--layout-width); margin: 0 auto; padding: 0 24px 60px;
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.page-button, .page-ellipsis {
  min-width: 40px; height: 40px; padding: 0 12px;
  display: grid; place-items: center;
  border-radius: 10px; font-size: 14px;
  background: var(--surface); color: var(--ink-mid);
  border: 1px solid var(--control-border);
  transition: all .2s;
}
.page-button:hover { color: var(--ink-strong); border-color: var(--line); }
.page-button.active { background: var(--ink-strong); color: var(--paper-strong); }
.page-button:disabled { opacity: .4; cursor: not-allowed; }
.page-ellipsis { border: none; background: none; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--footer-bg); border-top: 1px solid var(--line); margin-top: 20px; }
.footer-inner { max-width: var(--layout-width); margin: 0 auto; padding: 48px 24px; text-align: center; }
.footer-brand { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.footer-brand .brand-text { text-align: left; }
.footer-tagline { color: var(--ink-mid); font-size: 14px; margin: 0 0 20px; }
.footer-links { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; margin-bottom: 20px; }
.footer-links a { font-size: 14px; color: var(--ink-mid); }
.footer-links a:hover { color: var(--accent); }
.footer-copy { font-size: 12px; color: var(--ink-soft); }
.footer-copy a { color: var(--ink-soft); }
.footer-copy a:hover { color: var(--accent); }

/* ---------- 弹层 ---------- */
.modal-layer {
  position: fixed; inset: 0; z-index: 100;
  background: var(--overlay, #0e141b5c);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  opacity: 0; pointer-events: none; transition: opacity .25s;
}
.modal-layer[hidden] { display: none; }
.modal-layer.open { opacity: 1; pointer-events: auto; }
.modal-scroll { max-height: 90vh; overflow: auto; width: 100%; display: flex; justify-content: center; }
.modal-card {
  position: relative;
  width: 100%; max-width: 720px;
  background: var(--surface-strong);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow-strong);
  padding: 40px;
  margin: auto;
}
.modal-close {
  position: absolute; top: 18px; right: 18px;
  width: 36px; height: 36px; border-radius: 10px;
  display: grid; place-items: center;
  color: var(--ink-soft); background: var(--chip-muted);
  transition: all .2s;
}
.modal-close:hover { color: var(--ink-strong); background: var(--line); }
.modal-eyebrow { font-size: 12px; letter-spacing: 2px; color: var(--accent); font-weight: 600; }
.about-card h2 { margin: 6px 0 18px; font-size: 24px; }
.about-card p { color: var(--ink-mid); font-size: 15px; }
.about-card blockquote {
  margin: 20px 0 0; padding: 16px 20px;
  border-left: 3px solid var(--accent);
  background: var(--tag-bg); border-radius: 0 12px 12px 0;
  color: var(--ink-mid); font-style: italic;
}
.about-card .btn { margin-top: 20px; }

/* ---------- 公告条 ---------- */
.announce-bar {
  position: relative; z-index: 51;
  background: linear-gradient(90deg, #ffdacdf0, #cde8fae6);
  border-bottom: 1px solid var(--line);
}
[data-theme="dark"] .announce-bar { background: linear-gradient(90deg, #2a1f1a, #122a3a); }
.announce-inner {
  max-width: var(--layout-width); margin: 0 auto;
  padding: 9px 24px;
  display: flex; align-items: center; gap: 10px;
  font-size: 13px;
}
.announce-tag {
  flex: none; font-size: 11px; font-weight: 700; letter-spacing: 1px;
  padding: 2px 8px; border-radius: 6px;
  background: var(--accent-warm); color: #fff;
}
.announce-text { color: var(--ink-mid); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.announce-link { flex: none; color: var(--accent); font-weight: 600; }
.announce-link:hover { text-decoration: underline; }
.announce-close { margin-left: auto; flex: none; color: var(--ink-soft); font-size: 13px; padding: 2px 6px; border-radius: 6px; }
.announce-close:hover { color: var(--ink-strong); background: var(--chip-muted); }

/* ---------- 精选推广横幅 ---------- */
.promo { max-width: var(--layout-width); margin: 0 auto; padding: 4px 24px 22px; }
.promo-card {
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 28px 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #ffdacdf0, #cde8fae6);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
  transition: transform .25s ease, box-shadow .25s ease;
}
[data-theme="dark"] .promo-card { background: linear-gradient(135deg, #2a1f1a, #122a3a); }
.promo-card:hover { transform: translateY(-3px); box-shadow: var(--card-shadow-strong); }
.promo-copy { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.promo-eyebrow {
  align-self: flex-start; font-size: 11px; font-weight: 700; letter-spacing: 1.5px;
  padding: 3px 10px; border-radius: 999px;
  background: #ffffff7a; color: var(--ink-mid);
}
[data-theme="dark"] .promo-eyebrow { background: #ffffff14; }
.promo-copy strong { font-size: 19px; line-height: 1.35; }
.promo-copy small { font-size: 13px; color: var(--ink-mid); line-height: 1.6; }
.promo-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 2px; }
.promo-tags .promo-tag {
  font-size: 12px; padding: 3px 12px; border-radius: 999px;
  background: #ffffff7a; color: var(--ink-mid);
}
[data-theme="dark"] .promo-tags .promo-tag { background: #ffffff14; }
.promo-cta {
  flex: none; font-size: 14px; font-weight: 700;
  padding: 12px 22px; border-radius: 12px;
  background: var(--ink-strong); color: var(--paper-strong);
}

/* ---------- 本站统计 ---------- */
.stats-strip {
  max-width: var(--layout-width); margin: 0 auto; padding: 0 24px 56px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.stats-strip .stat {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 22px 12px;
  background: var(--surface-strong);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
}
.stats-strip .stat strong { font-size: 26px; color: var(--accent); line-height: 1.1; }
.stats-strip .stat span { font-size: 12px; color: var(--ink-soft); }

/* ---------- 友情链接 ---------- */
.friend-links {
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap;
  gap: 8px 14px; margin-bottom: 20px;
}
.friend-label { font-size: 12px; color: var(--ink-soft); letter-spacing: 1px; }
.friend-link {
  font-size: 13px; padding: 4px 14px; border-radius: 999px;
  border: 1px solid var(--control-border); color: var(--ink-mid);
  transition: all .2s;
}
a.friend-link:hover { color: var(--accent); border-color: var(--accent); }
span.friend-link { opacity: .55; }

/* ---------- 文章封面 ---------- */
.post-card-cover {
  margin: -24px -24px 0; height: 0; padding-bottom: 52%;
  position: relative; overflow: hidden;
  border-radius: var(--radius) var(--radius) 0 0;
}
.post-card-cover img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; transition: transform .4s ease;
}
.post-card:hover .post-card-cover img { transform: scale(1.05); }
.cover-fallback {
  background: linear-gradient(135deg,
    hsl(var(--h, 210) 65% 78%) 0%,
    hsl(calc(var(--h, 210) + 40) 60% 62%) 100%);
}
.cover-fallback span {
  position: absolute; inset: 0; display: grid; place-items: center;
  font-size: 44px; font-weight: 800; color: #ffffffcc;
  text-shadow: 0 2px 12px rgba(0, 0, 0, .18);
  letter-spacing: 2px;
}

/* ---------- 平台徽标 ---------- */
.platform-badges { display: flex; gap: 6px; flex-wrap: wrap; }
.platform-badge {
  font-size: 11px; padding: 2px 9px; border-radius: 6px;
  background: var(--tag-bg); color: var(--ink-mid);
  border: 1px solid var(--control-border);
}

/* ---------- 详情增强 ---------- */
.read-info { font-size: 13px; color: var(--ink-soft); margin-left: auto; }
.post-related { margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--line); }
.post-related h4 { margin: 0 0 14px; font-size: 15px; color: var(--ink-strong); }
.related-list { display: flex; flex-direction: column; gap: 8px; }
.related-item {
  display: flex; align-items: baseline; gap: 10px;
  padding: 10px 14px; border-radius: 10px;
  background: var(--tag-bg); font-size: 14px;
  transition: all .2s; cursor: pointer;
}
.related-item:hover { background: var(--chip-muted); transform: translateX(3px); }
.related-item time { font-size: 12px; color: var(--ink-soft); flex: none; }
.related-item span { color: var(--ink-mid); }

.post-pn { display: flex; align-items: center; gap: 12px; margin-top: 24px; }
.pn-spacer { flex: 1; }
.pn-btn {
  font-size: 14px; padding: 10px 18px; border-radius: 10px;
  background: var(--surface); color: var(--ink-mid);
  border: 1px solid var(--control-border);
  transition: all .2s; max-width: 45%;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.pn-btn:hover { color: var(--ink-strong); border-color: var(--line); transform: translateY(-1px); }

/* 文章详情 */
.post-modal-card { max-width: 780px; }
.post-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.post-meta time { font-size: 13px; color: var(--ink-soft); }
.post-tags { display: flex; gap: 6px; }
.post-tags .mini-tag { font-size: 12px; }
.post-title { margin: 0 0 24px; font-size: 28px; line-height: 1.3; }
.post-body { color: var(--ink-mid); }

/* Markdown 渲染 */
.markdown { font-size: 16px; line-height: 1.8; }
.markdown h1, .markdown h2, .markdown h3 { color: var(--ink-strong); margin: 1.4em 0 .6em; }
.markdown h1 { font-size: 24px; }
.markdown h2 { font-size: 20px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.markdown h3 { font-size: 17px; }
.markdown p { margin: .8em 0; }
.markdown blockquote {
  margin: 1em 0; padding: 12px 18px;
  border-left: 3px solid var(--accent);
  background: var(--tag-bg); border-radius: 0 12px 12px 0;
  color: var(--ink-mid);
}
.markdown code {
  background: var(--tag-bg); padding: 2px 6px; border-radius: 6px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .9em;
}
.markdown pre { background: #121a22; color: #e8eef5; padding: 16px; border-radius: 12px; overflow: auto; }
.markdown pre code { background: none; padding: 0; color: inherit; }
.markdown ul, .markdown ol { padding-left: 1.4em; }
.markdown li { margin: .3em 0; }
.markdown img { max-width: 100%; border-radius: 12px; }
.markdown a { color: var(--accent); }
.markdown hr { border: none; border-top: 1px solid var(--line); margin: 1.6em 0; }

/* ---------- 回到顶部 ---------- */
.backtop {
  position: fixed; right: 24px; bottom: 24px; z-index: 40;
  width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-items: center;
  background: var(--surface-strong); color: var(--ink-mid);
  border: 1px solid var(--card-border); box-shadow: var(--card-shadow);
  opacity: 0; pointer-events: none; transition: all .25s;
  font-size: 18px;
}
.backtop.show { opacity: 1; pointer-events: auto; }
.backtop:hover { color: var(--ink-strong); transform: translateY(-2px); }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .nav { display: none; }
  .search-pill { width: 170px; }
}

@media (max-width: 900px) {
  .posts-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; gap: 24px; }
  .hero-visual { min-height: 200px; }
}

@media (max-width: 720px) {
  .search-pill { display: none; }
  #search-toggle { display: grid; }
  .social-links { gap: 6px; }
  .social-btn { width: 30px; height: 30px; border-radius: 9px; }
  .social-btn svg { width: 15px; height: 15px; }
  .header-actions { gap: 7px; }
}

@media (max-width: 600px) {
  .posts-grid { grid-template-columns: 1fr; }
  .header-inner { padding: 0 16px; }
  .nav-link { padding: 8px 10px; font-size: 13px; }
  .brand-text small { display: none; }
  .hero { padding: 40px 20px 28px; }
  .posts { padding: 8px 20px 32px; }
  .tags-strip { padding: 8px 20px 20px; }
  .promo { padding: 4px 20px 18px; }
  .promo-card { padding: 22px 20px; flex-direction: column; align-items: flex-start; }
  .promo-cta { align-self: flex-start; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); padding: 0 20px 44px; }
  .hero-visual { display: none; }
  .modal-card { padding: 28px 22px; }
  .brand-text { display: none; }
}