/* ==========================================================
   外壳排版层 shell.css
   参考 shenlunsucai.com/app 的排版骨架：
   左侧固定导航（240 / 52）+ 顶部细条（38）+ 内容区
   加载顺序在 shenlun.css / tokens.css / refresh.css 之后，
   只覆盖"骨架"相关规则，不动页面内部的卡片与组件样式。
   ========================================================== */

:root{
  --sb-w: 240px;          /* 侧栏展开宽 */
  --sb-w-c: 52px;         /* 侧栏收起宽 */
  --row-h: 44px;          /* 导航项行高 */
  --sb-r: 8px;            /* 导航项圆角 */
  --strip-h: 38px;        /* 顶部细条高 */
  --shell-bg: #f4f2ed;
  --sb-bg: #fbfaf6;
  --sb-line: rgba(23,32,51,.10);
  --sb-ink: #3f4a5e;
  --sb-ink-2: #6b7488;
  --sb-ink-3: #8b93a3;
  --sb-active: rgba(23,32,51,.065);
}

body{ background: var(--shell-bg); }

/* ================= 侧栏 ================= */
.sidebar{
  width: var(--sb-w) !important;
  background: var(--sb-bg) !important;
  border-right: 1px solid var(--sb-line) !important;
  box-shadow: none !important;
  transition: width .18s ease, transform .22s ease !important;
}

/* 品牌行：高 52，logo + 标题 + 收起按钮 */
.sidebar .sidebar-header{
  position: relative !important;
  height: 52px;
  padding: 0 10px 0 14px !important;
  display: flex !important;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--sb-line) !important;
}
.sidebar .sb-brand{
  display: flex; align-items: center; gap: 8px;
  flex: 1; min-width: 0;
  text-decoration: none; color: var(--ink);
}
.sidebar .sb-brand .logo-ico{
  width: 26px; height: 26px; border-radius: 6px; flex-shrink: 0;
}
.sidebar .sb-brand-title{
  font-size: 14px; font-weight: 600; letter-spacing: .02em;
  color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.sidebar .sb-toggle{
  position: static !important;
  width: 28px; height: 28px; flex-shrink: 0;
  display: grid; place-items: center;
  border: 0; background: transparent; cursor: pointer;
  border-radius: 6px; color: var(--sb-ink-3);
  transition: background .15s ease, color .15s ease;
}
.sidebar .sb-toggle svg{ width: 16px; height: 16px; display: block; }
.sidebar .sb-toggle:hover{ background: var(--sb-active); color: var(--ink); }

/* 工具行：主按钮 + 方形图标按钮 */
.sb-tools{
  display: flex; align-items: center; gap: 6px;
  padding: 10px 12px 4px;
}
.sb-tool-main{
  flex: 1; min-width: 0; height: 36px;
  display: flex; align-items: center; gap: 9px;
  padding: 0 12px;
  border: 1px solid var(--sb-line); border-radius: var(--sb-r);
  background: #fff; color: var(--sb-ink);
  font: inherit; font-size: 13px; text-align: left; cursor: pointer;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.sb-tool-main svg{ width: 15px; height: 15px; flex-shrink: 0; color: var(--sb-ink-3); }
.sb-tool-main:hover{ background: var(--sb-active); border-color: rgba(23,32,51,.18); color: var(--ink); }
.sb-tool-ico{
  width: 36px; height: 36px; flex-shrink: 0;
  display: grid; place-items: center;
  border: 1px solid var(--sb-line); border-radius: var(--sb-r);
  background: #fff; color: var(--sb-ink-2); cursor: pointer;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.sb-tool-ico svg{ width: 16px; height: 16px; display: block; }
.sb-tool-ico:hover{ background: var(--sb-active); border-color: rgba(23,32,51,.18); color: var(--ink); }

/* 导航列表 */
.sidebar .sidebar-nav{
  padding: 4px 8px 10px !important;
  display: flex; flex-direction: column;
}
.sidebar .sidebar-nav::-webkit-scrollbar{ width: 4px; }
.sidebar .sidebar-nav::-webkit-scrollbar-thumb{ background: rgba(23,32,51,.16); border-radius: 4px; }

.sidebar .nav-section{ padding: 0 !important; margin: 0 0 4px !important; }
.sidebar .nav-section-title{
  font-size: 11px !important;
  letter-spacing: .06em !important;
  color: var(--sb-ink-3) !important;
  padding: 10px 10px 4px !important;
  font-weight: 500;
}

.sidebar .sidebar-nav .nav-item{
  height: var(--row-h) !important;
  min-height: var(--row-h);
  padding: 0 10px !important;
  border-radius: var(--sb-r) !important;
  gap: 10px !important;
  font-size: 13.5px !important;
  letter-spacing: .01em !important;
  color: var(--sb-ink) !important;
  background: transparent !important;
  font-weight: 400;
  transition: background .15s ease, color .15s ease;
}
.sidebar .sidebar-nav .nav-item:hover{
  background: var(--sb-active) !important;
  color: var(--ink) !important;
}
.sidebar .sidebar-nav .nav-item.active{
  background: var(--sb-active) !important;
  color: var(--ink) !important;
  font-weight: 600 !important;
  box-shadow: none !important;
}
.sidebar .sidebar-nav .nav-item.active::before{ display: none !important; }

.sidebar .sidebar-nav .nav-item .nav-icon{
  width: 16px; height: 16px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--sb-ink-3) !important;
}
.sidebar .sidebar-nav .nav-item .nav-icon svg{ width: 16px; height: 16px; display: block; }
.sidebar .sidebar-nav .nav-item.active .nav-icon{ color: var(--ink) !important; }
.sidebar .sidebar-nav .nav-item:hover .nav-icon{ color: var(--sb-ink) !important; }

.sidebar .sidebar-nav .nav-item .nav-label{ flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.sidebar .nav-badge{
  margin-left: auto;
  font-size: 10px !important;
  font-weight: 500;
  padding: 1px 6px !important;
  border-radius: 999px !important;
  letter-spacing: 0;
}
.sidebar .nav-badge.hot{
  background: rgba(23,32,51,.06) !important;
  color: #6b7488 !important;
}

/* 用户区吸附在导航底部（导航很长时仍然可见） */
.sidebar .sidebar-nav > .nav-section.is-bottom{
  position: sticky;
  bottom: 0;
  z-index: 2;
  margin-top: auto !important;
  padding: 8px 0 4px !important;
  background: var(--sb-bg);
  border-top: 1px solid var(--sb-line);
  box-shadow: 0 -8px 12px -8px rgba(23,32,51,.10);
}
.sidebar .sidebar-nav > .nav-section.is-bottom .nav-section-title{ padding-top: 2px !important; }

/* ================= 主内容区 ================= */
@media (min-width: 1025px){
  .main-content{ margin-left: var(--sb-w) !important; }
  html.sb-collapsed .sidebar{ width: var(--sb-w-c) !important; }
  html.sb-collapsed .main-content{ margin-left: var(--sb-w-c) !important; }
}
html.sb-collapsed .sidebar .sidebar-header{
  height: 52px !important;
  padding: 0 !important;
  display: flex !important;
  flex-direction: row !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 0 !important;
}

/* 顶部细条 */
.top-bar{
  height: var(--strip-h);
  min-height: var(--strip-h);
  padding: 0 20px !important;
  gap: 12px;
  background: rgba(244,242,237,.88) !important;
  backdrop-filter: saturate(1.1) blur(8px) !important;
  -webkit-backdrop-filter: saturate(1.1) blur(8px) !important;
  border-bottom: 1px solid var(--sb-line) !important;
}
.top-bar .breadcrumb{ font-size: 12.5px !important; gap: 6px; color: var(--sb-ink-3); }
.top-bar .breadcrumb a{ color: var(--sb-ink-2) !important; }
.top-bar .breadcrumb a:hover{ color: var(--ink) !important; }
.top-bar .breadcrumb .current{ color: var(--ink) !important; font-weight: 500; }
.top-bar .top-actions{ gap: 6px; }

/* 顶栏小胶囊按钮 */
.shell-chip{
  height: 28px; padding: 0 10px;
  display: inline-flex; align-items: center; gap: 5px;
  border: 1px solid var(--sb-line); border-radius: 6px;
  background: #fff; color: var(--sb-ink);
  font: inherit; font-size: 12px; line-height: 1;
  cursor: pointer; white-space: nowrap;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.shell-chip svg{ width: 14px; height: 14px; flex-shrink: 0; }
.shell-chip:hover{ background: var(--sb-active); border-color: rgba(23,32,51,.18); color: var(--ink); }

/* 顶栏原有按钮收敛到 28 高 */
.top-bar .settings-btn,
.top-bar .theme-btn,
.top-bar .fontsize-btn{
  height: 28px; min-height: 28px;
  border-radius: 6px;
  background: #fff !important;
  border: 1px solid var(--sb-line) !important;
  color: var(--sb-ink-2);
  padding: 0 9px;
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12px;
}
.top-bar .settings-btn:hover,
.top-bar .theme-btn:hover{ background: var(--sb-active) !important; color: var(--ink); }
.top-bar .login-btn{
  height: 28px; min-height: 28px; padding: 0 12px;
  border-radius: 6px; font-size: 12px;
}
.top-bar .user-btn{
  height: 28px; min-height: 28px; padding: 0 10px 0 4px;
  border-radius: 999px; font-size: 12px;
  background: #fff !important; border: 1px solid var(--sb-line) !important;
}
.top-bar .user-avatar{ width: 20px; height: 20px; }
.top-bar .user-avatar svg{ width: 14px; height: 14px; }

/* 内容区留白 */
.content-wrapper{
  max-width: 1240px !important;
  padding: 22px 28px 64px !important;
}

/* ================= 收起态 ================= */
html.sb-collapsed .sidebar .sb-brand{ display: none !important; }
html.sb-collapsed .sidebar .sb-toggle svg{ transform: rotate(180deg); }

html.sb-collapsed .sb-tools{ flex-direction: column; align-items: center; padding: 10px 6px 4px; }
html.sb-collapsed .sb-tool-main{ flex: none; width: 40px; height: 36px; padding: 0; justify-content: center; }
html.sb-collapsed .sb-tool-main .sb-tool-text{ display: none; }
html.sb-collapsed .sb-tool-ico{ width: 40px; height: 36px; }

html.sb-collapsed .sidebar .sidebar-nav{ padding: 4px 6px 10px !important; }
html.sb-collapsed .sidebar .nav-section{ margin-bottom: 2px !important; }
html.sb-collapsed .sidebar .nav-section-title{
  height: 1px; padding: 0 !important; margin: 10px 8px 8px;
  font-size: 0 !important; overflow: hidden;
  border-top: 1px solid var(--sb-line);
}
html.sb-collapsed .sidebar .nav-section:first-child .nav-section-title{ display: none; }
html.sb-collapsed .sidebar .sidebar-nav .nav-item{
  width: 40px; margin: 0 auto;
  justify-content: center; gap: 0 !important;
  padding: 0 !important;
}
html.sb-collapsed .sidebar .nav-label,
html.sb-collapsed .sidebar .nav-badge{ display: none !important; }
html.sb-collapsed .sidebar .sidebar-nav > .nav-section.is-bottom{ border-top: 0; }

/* ================= 移动端 ================= */
@media (max-width: 1024px){
  .sidebar{ width: min(280px, 84vw) !important; }
  .top-bar{ padding: 0 12px !important; height: 44px; min-height: 44px; }
  .content-wrapper{ padding: 16px 14px 56px !important; }
  .shell-chip.is-hide-sm{ display: none; }
}

/* ==========================================================
   现代化层 v1（2026-11）
   只调参数、不改结构：去黄 / 放大圆角 / 去描边 / 撤衬线 / 去毛玻璃
   整段删除即可完全回滚
   ========================================================== */
:root{
  /* 纸与卡：提亮去黄，卡面转纯白，拉开底—卡两层 */
  --paper:#f8f6f2;
  --paper-2:#fbfaf7;
  --card:#ffffff;
  --shell-bg:#f8f6f2;
  --sb-bg:#fbfaf7;
  /* 圆角上移：小件 10 / 卡面 14 */
  --r-s:10px;
  --r-m:14px;
  --sb-r:10px;
  /* 线淡化，分层交给阴影 */
  --line:rgba(23,32,51,.075);
  --line-2:rgba(23,32,51,.16);
  --sb-line:rgba(23,32,51,.075);
  --ink-3:#6f7889;
  --ink-4:#98a0ad;
  --shadow-1:0 1px 2px rgba(23,32,51,.04),0 2px 8px rgba(23,32,51,.035);
  --shadow-2:0 4px 18px rgba(23,32,51,.075),0 1px 3px rgba(23,32,51,.04);
  /* tokens.css 里的旧变量兼容层同步，避免内层仍用旧值 */
  --bg-color:var(--paper);
  --card-bg:#ffffff;
  --card-border:var(--line);
  --card-bg-hover:var(--paper-2);
  --card-border-hover:var(--line-2);
  --nav-active-bg:rgba(23,32,51,.055);
  --topbar-bg:rgba(248,246,242,.94);
  --input-bg:#ffffff;
  --input-border:rgba(23,32,51,.14);
}

/* 卡面：最淡一层线 + 阴影承担浮起，hover 抬 1px */
[class*="card"]:not([class*="card-head"]):not([class*="card-top"]):not([class*="card-bottom"]):not([class*="card-main"]){
  border-color:var(--line)!important;
  border-radius:var(--r-m);
  box-shadow:var(--shadow-1);
  transition:box-shadow .18s ease,transform .18s ease,border-color .18s ease;
}
[class*="card"]:not([class*="card-head"]):not([class*="card-top"]):not([class*="card-bottom"]):not([class*="card-main"]):hover{
  box-shadow:var(--shadow-2);
  transform:translateY(-1px);
}

/* 衬线退出 UI 标题，只留给 hero 与阅读正文 */
h1,h2,h3,h4,.page-header h1,.section-title,.ref-card-head span,.sidebar-header h2{
  font-family:var(--sans)!important;
  letter-spacing:-.012em;
}
.editorial-hero h1,.editorial-hero h2,.prose,.reading-body,.article-body,.essay-body,.answer-text,.quote-text{
  font-family:var(--serif)!important;
}

/* 顶栏回到实色（同时修正与 tokens 规则冲突的毛玻璃） */
.top-bar{
  background:rgba(248,246,242,.94)!important;
  backdrop-filter:none!important;
  -webkit-backdrop-filter:none!important;
  border-bottom-color:var(--line)!important;
}

/* 数字等宽对齐，收紧字距 */
.stat-card,.stat-value,[class*="stat-num"],[class*="stat-value"],.metric-value{
  font-variant-numeric:tabular-nums;
}

/* 徽章与顶栏小件胶囊化 */
.nav-badge,.shell-chip{ border-radius:999px!important; }

/* 表单控件统一圆角 */
input:not([type="checkbox"]):not([type="radio"]),textarea,select{
  border-radius:var(--r-s);
}

/* ==========================================================
   全宽层 v1（2026-11）：内容铺满侧栏右侧全部空间
   仅桌面端放开限宽，移动端保持原 padding
   ========================================================== */
@media (min-width:1025px){
  .content-wrapper{ max-width:none !important; padding:22px 32px 64px !important; }
}
.editorial-home,
.ref-home{ max-width:none; }