/* ==========================================================================
   BigBrother.chat Design System
   极简 · 克制 · Editorial · Digital Garden
   「纸张 + 数字界面」：暖白底 / 墨黑字 / 单一深墨绿强调色
   ========================================================================== */

:root {
  --bg: #FAFAF8;
  --card: #FFFFFF;
  --surface: #F4F4F1;
  --text: #18181B;
  --muted: #71717A;
  --faint: #A1A1AA;
  --primary: #2F5D4E;            /* 深墨绿（全站唯一强调色） */
  --primary-hover: #244739;
  --primary-soft: rgba(47, 93, 78, .07);
  --primary-line: rgba(47, 93, 78, .32);
  --border: #E4E4E7;
  --danger: #B3402F;
  --code-bg: #F4F4F1;
  --pre-bg: #26231F;              /* 代码块：双主题统一的深墨底 */
  --pre-text: #EDE9E2;
  --mask: rgba(24, 24, 27, .4);

  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --sans: "Inter", -apple-system, "SF Pro", "PingFang SC",
          "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;

  --radius: 8px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(24, 24, 27, .05);
  --shadow-md: 0 8px 24px rgba(24, 24, 27, .08);
  --shadow-lg: 0 20px 48px rgba(24, 24, 27, .14);

  --nav-h: 60px;
  --maxw: 960px;
  --read-w: 720px;
}

[data-theme="dark"] {
  --bg: #111111;
  --card: #181818;
  --surface: #1C1C1C;
  --text: #EDEDED;
  --muted: #A1A1AA;
  --faint: #636366;
  --primary: #8FB5A3;
  --primary-hover: #A9C9B9;
  --primary-soft: rgba(143, 181, 163, .1);
  --primary-line: rgba(143, 181, 163, .35);
  --border: #2A2A2A;
  --danger: #D97A68;
  --code-bg: #1C1C1C;
  --pre-bg: #1C1B19;
  --pre-text: #E5E2DA;
  --mask: rgba(0, 0, 0, .6);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, .35);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, .5);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-tap-highlight-color: transparent;
  transition: background-color .2s ease, color .2s ease;
}

::selection { background: var(--primary-line); }

a { color: inherit; }

/* ---------- 导航：固定顶部，滚动时收紧 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 24px;
  transition: height .2s ease;
}
.nav.scrolled .nav-inner { height: 48px; }
.nav-brand {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .5px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}
.nav-links { display: flex; align-items: center; gap: 20px; }
.nav a.nav-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color .15s, border-color .15s;
  white-space: nowrap;
}
.nav a.nav-link:hover { color: var(--text); }
.nav a.nav-link.active { color: var(--primary); border-bottom-color: var(--primary); }
.nav-spacer { flex: 1; }

.nav-actions { display: flex; align-items: center; gap: 6px; }
.nav-icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid transparent;
  background: none;
  color: var(--muted);
  font-size: 13px;
  font-family: var(--sans);
  padding: 5px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color .15s, background .15s;
}
.nav-icon-btn:hover { color: var(--text); background: var(--surface); }
.nav-icon-btn svg { width: 15px; height: 15px; display: block; }
.nav-icon-btn kbd {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--faint);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 5px;
  line-height: 1.6;
}
.nav-burger { display: none; }

/* 移动端下拉菜单 */
.nav-menu {
  display: none;
  border-top: 1px solid var(--border);
  background: var(--bg);
  padding: 8px 0 12px;
}
.nav-menu.open { display: block; }
.nav-menu a {
  display: block;
  padding: 10px 24px;
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
}
.nav-menu a:hover { color: var(--text); background: var(--surface); }
.nav-menu a.active { color: var(--primary); }

/* ---------- 布局 ---------- */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 24px 88px;
}
.container-narrow { max-width: var(--read-w); }

/* ---------- 卡片（基础样式保留给后台等页面） ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
}

/* ---------- 按钮 / 表单 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 14px;
  font-family: var(--sans);
  cursor: pointer;
  text-decoration: none;
  transition: border-color .15s, color .15s, background .15s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #FAFAF8;
}
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); color: #FAFAF8; }
/* 暗色下 --primary 是浅绿，白字对比度不足，改用深色文字 */
[data-theme="dark"] .btn-primary,
[data-theme="dark"] .btn-primary:hover { color: #12211A; }
.btn-danger:hover { border-color: var(--danger); color: var(--danger); }
.btn-sm { padding: 4px 12px; font-size: 13px; }

input[type="text"], input[type="password"], input[type="file"], textarea, select,
input[type="date"], input[type="email"], input[type="number"], input[type="url"],
input[type="search"], input[type="time"] {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--sans);
  background: var(--card);
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
label { display: block; font-size: 13px; color: var(--muted); margin: 14px 0 5px; }

/* ---------- 页头（Knowledge / Tools / About 共用） ---------- */
.page-head { margin-bottom: 32px; }
.page-head .kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 8px;
}
.page-head h1 {
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 1px;
}
.page-head p { color: var(--muted); font-size: 14.5px; margin-top: 6px; }
.page-head .head-link { color: var(--primary); text-decoration: none; border-bottom: 1px solid var(--primary-line); }
.page-head .head-link:hover { border-bottom-color: var(--primary); }

/* ---------- 首页 ---------- */
.hero { padding: 88px 0 64px; }
.hero .hero-kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 26px;
}
.hero h1 {
  font-family: var(--serif);
  font-size: 56px;
  font-weight: 700;
  letter-spacing: 4px;
  line-height: 1.3;
}
.hero .sub {
  font-family: var(--serif);
  font-size: 18px;
  color: var(--text);
  letter-spacing: 3px;
  margin-top: 26px;
}
.hero .tagline { color: var(--muted); font-size: 14.5px; margin-top: 14px; letter-spacing: .5px; }

/* 区块标题：标题 + 细线 + 右侧链接 */
.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin: 56px 0 4px;
}
.section-head h2 {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: 2px;
  white-space: nowrap;
}
.section-head .rule { flex: 1; height: 1px; background: var(--border); }
.section-head .more {
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .15s;
}
.section-head .more:hover { color: var(--primary); }

/* 兼容旧类名 */
.section-title {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: 2px;
  margin: 48px 0 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.section-title::after { content: ""; flex: 1; height: 1px; background: var(--border); }

/* Recent 最近动态 */
.recent-list { list-style: none; }
.recent-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: background .15s;
}
.recent-item:hover { background: var(--primary-soft); }
.recent-item .r-type {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--primary);
  flex-shrink: 0;
  width: 72px;
}
.recent-item .r-date {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--faint);
  flex-shrink: 0;
}
.recent-item .r-title {
  color: var(--text);
  font-size: 15px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color .15s;
}
.recent-item:hover .r-title { color: var(--primary); }

/* 核心入口：editorial 编号 + 两个简洁分区 */
.entry-list { border-top: 1px solid var(--border); }
.entry-row {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 28px 4px;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: background .18s;
}
.entry-row:hover { background: var(--primary-soft); }
.entry-row .e-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--faint);
  flex-shrink: 0;
  width: 26px;
}
.entry-row .e-main { flex: 1; min-width: 0; }
.entry-row .e-title {
  font-family: var(--serif);
  font-size: 19px;
  letter-spacing: 2px;
  color: var(--text);
  display: flex;
  align-items: baseline;
  gap: 12px;
  transition: transform .18s;
  width: fit-content;
}
.entry-row:hover .e-title { transform: translateX(4px); }
.entry-row .e-title .e-en {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--faint);
}
.entry-row .e-desc { color: var(--muted); font-size: 14px; margin-top: 4px; }
.entry-row .e-count { font-family: var(--mono); font-size: 12.5px; color: var(--faint); flex-shrink: 0; }
.entry-row .e-arrow { color: var(--faint); flex-shrink: 0; transition: transform .15s, color .15s; }
.entry-row:hover .e-arrow { transform: translateX(4px); color: var(--primary); }

/* 兼容旧入口卡片 */
.entry-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin: 40px 0; }
.entry-card { display: block; text-decoration: none; color: var(--text); position: relative; }
.entry-card h2 { font-family: var(--serif); font-size: 20px; letter-spacing: 2px; margin-bottom: 8px; }
.entry-card p { color: var(--muted); font-size: 14px; }
.entry-card .count { position: absolute; top: 24px; right: 28px; font-family: var(--mono); font-size: 12.5px; color: var(--primary); }

/* Building 正在构建 */
.building-list { list-style: none; border-top: 1px solid var(--border); }
.building-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--border);
}
.building-row .b-name { font-size: 15px; font-weight: 600; color: var(--text); flex-shrink: 0; }
.building-row .b-desc {
  color: var(--muted);
  font-size: 14px;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.status-badge {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.status-badge::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
}

/* Editorial 文章列表（首页最新文章 / 通用） */
.ed-list { list-style: none; border-top: 1px solid var(--border); }
.ed-item {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 15px 4px;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: background .15s;
}
.ed-item:hover { background: var(--primary-soft); }
.ed-item .ed-date {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--faint);
  flex-shrink: 0;
  width: 86px;
}
.ed-item .ed-cat {
  font-size: 12.5px;
  color: var(--primary);
  flex-shrink: 0;
  width: 56px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ed-item .ed-title {
  flex: 1;
  min-width: 0;
  font-size: 15.5px;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color .18s, transform .18s;
}
.ed-item:hover .ed-title { color: var(--primary); transform: translateX(4px); }
.ed-item .ed-arrow { color: var(--faint); flex-shrink: 0; transition: transform .15s, color .15s; }
.ed-item:hover .ed-arrow { transform: translateX(4px); color: var(--primary); }

/* ---------- 文章流列表（知识库） ---------- */
.post-list { list-style: none; border-top: 1px solid var(--border); }
.post-item {
  display: block;
  padding: 20px 4px;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  transition: background .15s;
}
.post-item:hover { background: var(--primary-soft); }
.post-item .title {
  font-family: var(--serif);
  font-size: 17.5px;
  font-weight: 600;
  letter-spacing: .5px;
  transition: color .18s, transform .18s;
  width: fit-content;
}
.post-item:hover .title { color: var(--primary); transform: translateX(4px); }
.post-item .excerpt {
  color: var(--muted);
  font-size: 14px;
  margin-top: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-item .meta { font-size: 12.5px; color: var(--faint); margin-top: 8px; font-family: var(--mono); }
.post-item .meta .cat { color: var(--primary); font-family: var(--sans); }

.tag { display: inline-block; color: var(--muted); font-size: 12.5px; margin-right: 10px; font-family: var(--sans); }
.tag::before { content: "#"; color: var(--primary); margin-right: 1px; }

/* 未公开徽标（管理员可见） */
.badge-hidden {
  display: inline-block;
  background: var(--surface);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 7px;
  font-size: 11.5px;
  vertical-align: 2px;
}
.is-hidden-item { opacity: .55; }

/* ---------- 知识库布局 ---------- */
.kb-layout { display: grid; grid-template-columns: 180px 1fr; gap: 36px; align-items: start; }
.kb-side { position: sticky; top: calc(var(--nav-h) + 20px); padding: 4px 0; background: none; border: none; }
.kb-side .side-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--faint);
  padding: 0 10px 8px;
}
.kb-side .cat {
  display: flex;
  justify-content: space-between;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  transition: color .15s, background .15s;
}
.kb-side .cat span:last-child { font-family: var(--mono); font-size: 12px; color: var(--faint); }
.kb-side .cat:hover { background: var(--surface); color: var(--text); }
.kb-side .cat.active { color: var(--primary); font-weight: 600; background: var(--primary-soft); }
.kb-side .cat.active span:last-child { color: var(--primary); }

.search-row { display: flex; gap: 10px; margin-bottom: 28px; }

/* ---------- 文章详情页：像独立出版物一样舒服 ---------- */
.article-head { margin-bottom: 32px; max-width: var(--read-w); }
.article-head .a-cat {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}
.article-head h1 {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 1px;
  line-height: 1.45;
}
.article-head .meta { color: var(--muted); font-size: 13.5px; margin-top: 14px; font-family: var(--mono); }
.article-head .a-rule { height: 1px; background: var(--border); margin-top: 28px; }
.article-head .admin-row { margin-top: 16px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

.article-tags { max-width: var(--read-w); margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); }
.article-tags .t-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 8px;
}

.article-layout { display: grid; grid-template-columns: 1fr 180px; gap: 44px; align-items: start; }
.article-layout.no-toc { grid-template-columns: 1fr; }
.article-body { max-width: var(--read-w); }

.toc { position: sticky; top: calc(var(--nav-h) + 20px); font-size: 13px; border-left: 1px solid var(--border); }
.toc .toc-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--faint);
  padding-left: 14px;
  margin-bottom: 8px;
}
.toc a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  padding: 4px 14px;
  border-left: 1px solid transparent;
  margin-left: -1px;
  transition: color .15s, border-color .15s;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.toc a.h3 { padding-left: 28px; font-size: 12.5px; }
.toc a:hover { color: var(--text); }
.toc a.active { color: var(--primary); border-left-color: var(--primary); }

/* ---------- Markdown 正文：中文长文阅读优先 ---------- */
.md-body { font-size: 17px; line-height: 1.9; letter-spacing: .01em; overflow-wrap: break-word; word-break: break-word; }
.md-body h1, .md-body h2, .md-body h3, .md-body h4 {
  font-family: var(--serif);
  line-height: 1.45;
  letter-spacing: .5px;
  scroll-margin-top: calc(var(--nav-h) + 16px);
}
.md-body h1 { font-size: 25px; margin: 44px 0 16px; }
.md-body h2 { font-size: 22px; margin: 52px 0 16px; }
.md-body h3 { font-size: 18px; margin: 40px 0 12px; }
.md-body h4 { font-size: 16.5px; margin: 32px 0 10px; }
.md-body h1:first-child, .md-body h2:first-child, .md-body h3:first-child { margin-top: 0; }
.md-body p { margin: 18px 0; }
.md-body ul, .md-body ol { margin: 18px 0 18px 26px; }
.md-body li { margin: 8px 0; }
.md-body li::marker { color: var(--primary); }
.md-body strong { font-weight: 600; }
.md-body code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: var(--mono);
  font-size: 13.5px;
}
/* 代码块：双主题统一深墨底，hover 显示复制按钮 */
.md-body pre {
  position: relative;
  background: var(--pre-bg);
  color: var(--pre-text);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 24px 0;
  -webkit-overflow-scrolling: touch;
}
.md-body pre code { background: none; border: none; padding: 0; color: inherit; font-size: 13.5px; line-height: 1.7; }
.copy-btn {
  position: absolute;
  top: 8px;
  right: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 1.5px;
  color: rgba(237, 233, 226, .45);
  background: none;
  border: none;
  cursor: pointer;
  padding: 3px 4px;
  opacity: 0;
  transition: opacity .15s, color .15s;
}
.md-body pre:hover .copy-btn, .copy-btn.done { opacity: 1; }
.copy-btn:hover { color: var(--pre-text); }
@media (hover: none) { .copy-btn { opacity: .75; } }
/* 引用：左侧细线，不是卡片 */
.md-body blockquote {
  border-left: 2px solid var(--primary);
  padding: 2px 0 2px 22px;
  margin: 28px 0;
  font-family: var(--serif);
  color: var(--text);
  letter-spacing: .02em;
}
.md-body blockquote p { margin: 8px 0; }
.md-body hr { border: none; height: 1px; background: var(--border); margin: 36px 0; }
.md-body img { max-width: 100%; border-radius: 4px; display: block; margin: 28px auto; }
.md-body table { border-collapse: collapse; width: 100%; margin: 20px 0; font-size: 14.5px; }
.md-body th { background: var(--surface); font-weight: 600; text-align: left; }
.md-body th, .md-body td { border: 1px solid var(--border); padding: 8px 14px; }
.md-body a { color: var(--primary); text-decoration: none; border-bottom: 1px solid var(--primary-line); transition: border-color .15s; }
.md-body a:hover { border-bottom-color: var(--primary); }

/* ---------- 编辑器 ---------- */
.editor-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.editor-grid textarea { min-height: 520px; font-family: var(--mono); font-size: 14px; line-height: 1.7; resize: vertical; }
.editor-preview { overflow-y: auto; max-height: 600px; padding: 16px 20px; }

/* ---------- 工具箱：Editorial 列表 ---------- */
.tools-head { margin-bottom: 36px; }
.tools-head h1 { font-family: var(--serif); font-size: 30px; letter-spacing: 2px; }
.tools-head p { color: var(--muted); font-size: 14.5px; margin-top: 6px; }

.tool-list { border-top: 1px solid var(--border); }
.tool-row {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px 4px;
  border-bottom: 1px solid var(--border);
  transition: background .15s;
}
.tool-row:hover { background: var(--primary-soft); }
.tool-row .t-main { flex: 1; min-width: 0; }
.tool-row h3 {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: 1px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
.tool-row h3 .ver { font-family: var(--mono); font-size: 12px; color: var(--primary); font-weight: 400; }
.tool-row .tool-meta {
  font-size: 12.5px;
  color: var(--faint);
  margin-top: 3px;
  font-family: var(--mono);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.tool-row .tool-meta .plat { color: var(--muted); }
.tool-row .desc { color: var(--muted); font-size: 14px; margin-top: 6px; }
.tool-row .actions { display: flex; gap: 14px; flex-wrap: wrap; flex-shrink: 0; align-items: baseline; }
/* 动作收敛为文字链接——个人网站不是 SaaS，不堆按钮 */
.tool-row .actions .t-act {
  border: none;
  background: none;
  padding: 2px 0;
  font-size: 13.5px;
  font-family: var(--sans);
  color: var(--muted);
  text-decoration: none;
  cursor: pointer;
  transition: color .15s;
  white-space: nowrap;
}
.tool-row .actions .t-act:hover { color: var(--primary); }
.tool-row .actions .t-act.strong { color: var(--primary); }
.tool-row .actions .t-act.strong:hover { color: var(--primary-hover); }
.tool-row .actions .t-act.danger:hover { color: var(--danger); }

/* 兼容旧工具卡片 */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }
.tool-card { display: flex; flex-direction: column; }
.tool-card h3 { font-family: var(--serif); font-size: 18px; letter-spacing: 1px; margin-bottom: 6px; }
.tool-card h3 .ver { font-family: var(--mono); font-size: 12px; color: var(--primary); margin-left: 6px; }
.tool-card .tool-meta { font-size: 12.5px; color: var(--faint); margin-bottom: 8px; }
.tool-card .desc { color: var(--muted); font-size: 14px; flex: 1; }
.tool-card .actions { margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- About 页 ---------- */
.about-statement {
  font-family: var(--serif);
  font-size: 24px;
  line-height: 1.9;
  letter-spacing: 1px;
  margin: 16px 0 40px;
}
.about-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin: 32px 0 48px; }
.about-cols .a-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}
.about-cols ul { list-style: none; }
.about-cols li { padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 15px; color: var(--text); }
.about-links { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- 弹窗 ---------- */
.modal-mask {
  position: fixed;
  inset: 0;
  background: var(--mask);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
}
.modal-mask.show { display: flex; }
.modal {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  width: 500px;
  max-width: 92vw;
  max-height: 88vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}
.modal h3 { font-family: var(--serif); letter-spacing: 1px; margin-bottom: 6px; }

/* ---------- 全局搜索浮层（Ctrl K / /） ---------- */
.search-mask {
  position: fixed;
  inset: 0;
  background: var(--mask);
  z-index: 300;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 16px 16px;
}
.search-mask.show { display: flex; }
.search-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 560px;
  max-width: 100%;
  overflow: hidden;
  animation: searchIn .15s ease;
}
@keyframes searchIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }
.search-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.search-input-row svg { width: 16px; height: 16px; color: var(--faint); flex-shrink: 0; }
.search-input-row input {
  border: none !important;
  box-shadow: none !important;
  background: none !important;
  padding: 0;
  font-size: 15px;
}
.search-results { max-height: 50vh; overflow-y: auto; padding: 8px; }
.search-group {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--faint);
  padding: 10px 10px 4px;
}
.search-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text);
}
.search-item:hover, .search-item.sel { background: var(--primary-soft); }
.search-item .s-title { font-size: 14.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.search-item .s-meta { font-size: 12px; color: var(--faint); flex-shrink: 0; font-family: var(--mono); }
.search-foot {
  border-top: 1px solid var(--border);
  padding: 8px 16px;
  font-size: 12px;
  color: var(--faint);
  display: flex;
  gap: 14px;
}
.search-foot kbd {
  font-family: var(--mono);
  font-size: 11px;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 5px;
}
.search-empty { padding: 28px; text-align: center; color: var(--muted); font-size: 14px; }

/* ---------- 杂项 ---------- */
.empty { text-align: center; color: var(--muted); padding: 64px 0; font-size: 14.5px; }
.empty a { color: var(--primary); }

.back-link {
  display: inline-block;
  margin-top: 32px;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: color .15s;
}
.back-link:hover { color: var(--primary); }

.footer {
  text-align: center;
  color: var(--faint);
  font-size: 12.5px;
  padding: 32px 24px 40px;
  border-top: 1px solid var(--border);
  max-width: var(--maxw);
  margin: 0 auto;
}
.footer .f-motto { font-family: var(--serif); letter-spacing: 2px; color: var(--muted); margin-bottom: 4px; }

/* 页面淡入（克制的动效：透明度 + 4px 上浮） */
@keyframes pageIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.container, .hero { animation: pageIn .28s ease; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* ==========================================================================
   移动端（<=760px）：重新组织布局，而非简单压缩
   ========================================================================== */
@media (max-width: 760px) {
  .nav-inner { padding: 0 16px; gap: 12px; height: 52px; }
  .nav.scrolled .nav-inner { height: 52px; }
  .nav-brand { font-size: 15.5px; }
  .nav-links { display: none; }
  .nav-icon-btn .nb-label, .nav-icon-btn kbd { display: none; }
  .nav-burger { display: inline-flex; }

  .container { padding: 28px 16px 64px; }

  /* 首页 */
  .hero { padding: 52px 0 42px; }
  .hero .hero-kicker { font-size: 10.5px; letter-spacing: 2px; margin-bottom: 20px; }
  .hero h1 { font-size: 36px; letter-spacing: 2.5px; }
  .hero .sub { font-size: 16px; letter-spacing: 2px; margin-top: 20px; }
  .hero .tagline { font-size: 13.5px; }
  .section-head { margin: 40px 0 2px; }
  .section-head h2 { font-size: 17px; }
  .recent-item { gap: 10px; }
  .recent-item .r-type { width: auto; }
  .recent-item .r-date { display: none; }
  .entry-row { gap: 14px; padding: 22px 4px; }
  .entry-row .e-num { width: auto; }
  .entry-row .e-count { display: none; }
  .building-row .b-desc { white-space: normal; }
  .ed-item { gap: 10px; }
  .ed-item .ed-cat { display: none; }
  .ed-item .ed-date { width: auto; }

  /* 知识库：侧栏变横向滑动分类条 */
  .kb-layout { grid-template-columns: 1fr; gap: 16px; }
  .kb-side {
    position: static;
    display: flex;
    overflow-x: auto;
    gap: 6px;
    padding: 2px 0 6px;
    -webkit-overflow-scrolling: touch;
  }
  .kb-side .side-title { display: none; }
  .kb-side .cat { white-space: nowrap; flex-shrink: 0; border: 1px solid var(--border); }
  .kb-side .cat.active { border-color: var(--primary-line); }
  .search-row { flex-wrap: wrap; }

  /* 文章页：目录隐藏，正文全宽，字号行高按阅读 App 调 */
  .article-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
  .article-head h1 { font-size: 26px; }
  .md-body { font-size: 16px; line-height: 1.85; }
  .md-body h1 { font-size: 21px; margin: 36px 0 14px; }
  .md-body h2 { font-size: 19px; margin: 40px 0 14px; }
  .md-body h3 { font-size: 16.5px; margin: 32px 0 10px; }
  .md-body pre { padding: 14px 16px; font-size: 13px; }
  .md-body blockquote { padding-left: 16px; margin: 24px 0; }
  .md-body table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }

  /* 编辑器 */
  .editor-grid { grid-template-columns: 1fr; }
  .editor-grid textarea { min-height: 320px; }

  /* 工具页：动作换行到信息下方 */
  .tool-row { flex-direction: column; align-items: stretch; gap: 12px; }
  .tool-row .actions { justify-content: flex-start; }

  /* About */
  .about-statement { font-size: 19px; }
  .about-cols { grid-template-columns: 1fr; gap: 28px; }

  .page-head h1 { font-size: 24px; }
  .tools-head h1 { font-size: 24px; }
  .modal { padding: 22px 20px; }
  .card { padding: 20px 18px; }
  .search-mask { padding-top: 8vh; }
}