/* ============================================================
   光华 · 26P5 学习协作平台 — 北大视觉风格
   北大红 #C8112E / 宣纸米色底 / 衬线标题
   ============================================================ */
:root{
  /* —— 品牌：北大红只点睛 —— */
  --pku-red:#C8112E;
  --pku-red-dark:#A50D24;
  --pku-gold:#B08A3E;
  --gold-050:#FBF4E5;
  /* —— 墨玉 / 宣纸 —— */
  --ink:#14161B;
  --ink-soft:#55514b;
  --ink-800:#1E2128;
  --ink-700:#2A2E38;
  --paper:#FBF9F5;
  --paper-2:#FFFFFF;
  --paper-3:#F4F1EA;
  --line:#EAE6DE;
  --line-strong:#D5CEC0;
  --silver:#8A93A6;
  /* —— 语义色 —— */
  --green:#1F7A4D;
  --green-bg:#E8F5EE;
  --gray:#8A93A6;
  --gray-bg:#F1EFE8;
  --red-bg:#FBE9EC;
  /* —— 阴影：柔和双层，不用重投影 —— */
  --shadow:0 1px 2px rgba(20,22,27,.04);
  --shadow-lg:0 8px 24px -12px rgba(20,22,27,.10);
  --shadow-3:0 16px 40px -12px rgba(20,22,27,.16);
  --focus-glow:0 0 0 3px rgba(200,17,46,.12);
  --radius:14px;
  --radius-sm:8px;
  --radius-lg:18px;
  /* —— 字体 —— */
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --sans:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;
  --mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  /* —— 动效：只做 opacity / transform，克制 —— */
  --ease-out:cubic-bezier(.22,.61,.36,1);
  --dur-1:120ms;
  --dur-2:200ms;
  --dur-3:320ms;
  /* —— 布局 —— */
  --content-max:1240px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  background-image:radial-gradient(circle at 12% 8%,rgba(200,17,46,.04),transparent 40%),
                   radial-gradient(circle at 88% 92%,rgba(184,134,11,.05),transparent 42%);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--pku-red);text-decoration:none}
a:hover{text-decoration:underline}
button{font-family:inherit;cursor:pointer}
.hidden{display:none !important}

/* ---------- 登录页 ---------- */
.login-wrap{
  min-height:100vh;display:flex;align-items:center;justify-content:center;
  padding:24px;
  background:
    linear-gradient(135deg,rgba(200,17,46,.92),rgba(158,13,36,.95)),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='40' height='40'><rect width='40' height='40' fill='none'/></svg>");
  position:relative;overflow:hidden;
}
.login-wrap::after{
  content:"";position:absolute;inset:0;
  background-image:
    repeating-linear-gradient(135deg,rgba(255,255,255,.04) 0 2px,transparent 2px 22px);
  pointer-events:none;
}
.login-card{
  position:relative;z-index:1;width:100%;max-width:420px;
  background:var(--paper-2);border-radius:18px;padding:38px 34px;
  box-shadow:var(--shadow-lg);
}
.login-card img.login-logo{width:160px;height:auto;margin:0 auto 14px;display:block}
.login-card h1{
  font-family:var(--serif);text-align:center;font-size:26px;color:var(--pku-red-dark);
  letter-spacing:2px;
}
.login-card .sub{text-align:center;color:var(--ink-soft);font-size:13px;margin:6px 0 26px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--ink-soft);margin-bottom:6px}
.field input{
  width:100%;padding:11px 13px;border:1px solid var(--line-strong);border-radius:10px;
  font-size:15px;background:#fff;transition:border-color .15s;
}
.field input:focus{outline:none;border-color:var(--pku-red)}
/* 登录：姓名拼音 + 邮箱后缀下拉（默认 @stu.pku.edu.cn，可切 @gsm.pku.edu.cn） */
.acct-group{display:flex;align-items:stretch;border:1px solid var(--line-strong);border-radius:10px;background:#fff;overflow:hidden;transition:border-color .15s}
.acct-group input{flex:1;min-width:0;border:0;border-radius:0;padding:11px 13px;font-size:15px;background:transparent}
.acct-group input:focus{outline:none}
.acct-group .acct-suffix{
  display:flex;align-items:center;padding:0 12px;background:var(--paper);color:var(--gray);
  font-size:13px;border-left:1px solid var(--line);white-space:nowrap;user-select:none;
}
.acct-group:focus-within{border-color:var(--pku-red)}
.acct-group:focus-within .acct-suffix{background:var(--gray-bg);color:var(--ink-soft)}
/* 邮箱后缀下拉（@stu.pku.edu.cn / @gsm.pku.edu.cn） */
.acct-group select.acct-suffix{
  display:block;appearance:none;-webkit-appearance:none;-moz-appearance:none;
  border:0;border-left:1px solid var(--line);border-radius:0;
  padding:0 24px 0 10px;font-family:inherit;font-size:13px;color:var(--gray);
  background-color:var(--paper);
  background-image:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M2 4.5L6 8.5L10 4.5' fill='none' stroke='%23888' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 7px center;background-size:9px;
  cursor:pointer;text-align:left;
}
.acct-group select.acct-suffix:focus{outline:none}
.acct-group select.acct-suffix option{color:var(--ink);background:#fff}
@media (max-width:420px){
  .acct-group select.acct-suffix{padding:0 19px 0 8px;font-size:12px;background-position:right 4px center}
}
.switch-line{margin-top:12px;font-size:13px;color:var(--gray);text-align:center}
.link-btn{background:none;border:0;padding:0;font-size:13px;color:var(--pku-red);cursor:pointer;font-family:inherit}
.link-btn:hover{text-decoration:underline}
/* 登录 / 验证码注册 tab */
.lg-tabs{display:flex;gap:6px;background:var(--gray-bg);border-radius:10px;padding:4px;margin-bottom:18px}
.lg-tab{flex:1;border:0;background:transparent;border-radius:8px;padding:9px 10px;font-size:14px;color:var(--ink-soft);cursor:pointer;font-family:inherit;transition:background .15s,color .15s}
.lg-tab:hover:not(.active){color:var(--ink)}
.lg-tab.active{background:#fff;color:var(--pku-red);font-weight:500;box-shadow:0 1px 2px rgba(0,0,0,.06)}
.code-row{display:flex;gap:8px}
.code-row input{flex:1;min-width:0}
.code-row .btn{flex-shrink:0;white-space:nowrap;padding:11px 14px}
.field .opt{font-weight:400;color:var(--gray);font-size:12px}
.hint .warn{color:var(--pku-red)}
/* 首次登录改密码提示条 */
.pwd-tip{
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  padding:11px 14px;margin-bottom:16px;border:1px solid var(--pku-red);
  border-radius:10px;background:var(--red-bg);color:var(--pku-red-dark);font-size:13.5px;
}
.pwd-tip span{flex:1;min-width:200px}
.pwd-tip .btn{flex-shrink:0}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:11px 18px;border:none;border-radius:10px;font-size:15px;font-weight:600;
  background:var(--pku-red);color:#fff;transition:background .15s,transform .05s;
}
.btn:hover{background:var(--pku-red-dark)}
.btn:active{transform:translateY(1px)}
.btn.block{width:100%}
.btn.ghost{background:transparent;color:var(--pku-red);border:1px solid var(--pku-red)}
.btn.ghost:hover{background:var(--red-bg)}
.btn[disabled],.btn:disabled{opacity:.45;cursor:not-allowed;background:#f2f2f2;color:#999;border-color:#ddd}
.btn.ghost[disabled],.btn.ghost:disabled{background:transparent;color:#b9a2a6;border-color:#e3d3d6}
.mi-ops{display:flex;gap:6px;flex-shrink:0;align-items:center;flex-wrap:wrap}
.btn.sm{padding:7px 12px;font-size:13px;border-radius:8px}
.btn.xs{padding:4px 8px;font-size:12px;border-radius:6px}
.btn.danger{background:var(--pku-red);color:#fff}
.btn.danger:hover{background:var(--pku-red-dark)}
.btn.danger.ghost{background:transparent;color:var(--pku-red);border:1px solid var(--pku-red)}
.btn.danger.ghost:hover{background:var(--red-bg)}
.hint{font-size:12px;color:var(--gray);margin-top:10px;text-align:center}
.demo-row{display:flex;gap:8px;margin-top:18px}
.demo-row .btn{flex:1;font-size:13px;padding:9px 6px}
.divider{display:flex;align-items:center;gap:10px;color:var(--gray);font-size:12px;margin:22px 0 4px}
.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--line)}

/* ---------- 应用布局 ---------- */
.app-shell{display:flex;flex-direction:column;min-height:100vh}
.sidebar{
  width:236px;flex-shrink:0;background:linear-gradient(180deg,var(--pku-red),var(--pku-red-dark));
  color:#fff;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;
}
.sidebar .brand{
  display:flex;flex-direction:column;align-items:flex-start;gap:10px;
  padding:18px 16px 16px;color:var(--ink);text-decoration:none;cursor:pointer;
  background:var(--paper-2);border-bottom:1px solid rgba(255,255,255,.15)
}
.sidebar .brand:hover{text-decoration:none;opacity:.92}
.sidebar .brand .logo-img{height:48px;width:auto;display:block;flex-shrink:0;max-width:100%}
.sidebar .brand .t1{font-family:var(--serif);font-size:17px;letter-spacing:1px;line-height:1.2;color:var(--ink)}
.sidebar .brand .t2{font-size:11px;color:var(--ink-soft);margin-top:2px}
.nav{padding:14px 10px;flex:1;overflow:auto}
.nav a{
  display:flex;align-items:center;gap:11px;padding:11px 14px;border-radius:10px;
  color:rgba(255,255,255,.9);font-size:14.5px;margin-bottom:4px;transition:background .15s;
}
.nav a:hover{background:rgba(255,255,255,.12);text-decoration:none}
.nav a.active{background:rgba(255,255,255,.2);font-weight:600}
.nav a .ico{width:18px;text-align:center;opacity:.95}
/* 侧边栏底部用户区：移动端顶栏放不下的「改密码 / 退出」移到这里 */
.side-user{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 14px;border-top:1px solid rgba(255,255,255,.18);background:rgba(0,0,0,.16)}
.side-user .su-info{min-width:0}
.side-user .su-name{font-size:13.5px;font-weight:600;color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.side-user .su-role{font-size:11px;color:rgba(255,255,255,.62);margin-top:2px}
.side-user .su-ops{display:flex;gap:6px;flex:0 0 auto}
.side-user .su-ops .btn.xs{padding:5px 9px;font-size:12px;color:rgba(255,255,255,.92);border-color:rgba(255,255,255,.32)}
.side-user .su-ops .btn.xs:hover{background:rgba(255,255,255,.14)}
.side-foot{padding:12px 14px;font-size:11px;opacity:.6}
.nav .section{font-size:11px;opacity:.6;padding:14px 14px 6px;letter-spacing:1px}
.main{flex:1;display:flex;flex-direction:column;min-width:0}

/* ---------- 顶部主导航（二期：侧栏 → 顶部一级 + 页面内二级 tab） ---------- */
.hdr{
  position:sticky;top:0;z-index:30;height:56px;
  display:flex;align-items:center;gap:20px;padding:0 28px;
  background:rgba(251,249,245,.88);
  backdrop-filter:blur(12px) saturate(1.1);
  -webkit-backdrop-filter:blur(12px) saturate(1.1);
  border-bottom:1px solid var(--line);
}
.hdr-brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.hdr-brand:hover{text-decoration:none}
.hdr-logo{height:34px;width:auto;display:block}
.hdr-brand-txt{display:flex;flex-direction:column;line-height:1.15}
.hdr-brand-txt b{font-family:var(--serif);font-size:15px;color:var(--ink);font-weight:700;letter-spacing:.5px}
.hdr-brand-txt i{font-style:normal;font-size:10.5px;color:var(--gray);letter-spacing:.5px}
.hdr-nav{display:flex;align-items:center;gap:2px;flex:1;min-width:0}
.hdr-nav-a{
  position:relative;padding:8px 14px;border-radius:8px;font-size:14.5px;color:var(--ink-soft);
  text-decoration:none;
  transition:color var(--dur-1) var(--ease-out),background var(--dur-1) var(--ease-out);
}
.hdr-nav-a:hover{color:var(--ink);background:var(--gray-bg);text-decoration:none}
.hdr-nav-a.active{color:var(--pku-red);font-weight:600}
.hdr-nav-a.active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:-9px;height:2px;
  background:var(--pku-red);border-radius:2px;
}
.hdr-right{display:flex;align-items:center;gap:12px;flex-shrink:0}
.hdr-user{display:flex;align-items:center;gap:8px}
.hdr-avatar{
  width:30px;height:30px;border-radius:50%;background:var(--pku-red);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;flex-shrink:0;
}
.hdr-name{font-size:13.5px;color:var(--ink-soft);white-space:nowrap}
.hdr-role{
  font-size:11px;padding:2px 8px;border-radius:20px;background:var(--red-bg);
  color:var(--pku-red);font-weight:600;white-space:nowrap;
}
.hdr-ops{display:flex;gap:6px}
.sprite-host{display:none}
.ico{width:18px;height:18px;flex-shrink:0;vertical-align:-3px}
/* 图标通用描边设定（lucide 的 stroke 在根 svg 上，提取 symbol 后需在此补齐） */
svg.ico,svg.ico-lg{fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
svg.ico-lg{width:44px;height:44px;stroke-width:1.5}
.empty .big svg.ico-lg{color:var(--gray);opacity:.42}
/* 行内小图标容器：图标尺寸继承容器语义 */
.mi-file-ico svg.ico,.mat-item .mi-file-ico svg.ico{width:15px;height:15px;opacity:.72;vertical-align:-2px}
.pin-tag svg.ico{width:13px;height:13px;color:var(--pku-gold);vertical-align:-2px}
.al-upload-zone .al-ico svg.ico{width:34px;height:34px;opacity:.5}
.asg-section-title svg.ico{width:15px;height:15px;opacity:.8;vertical-align:-2px}
.btn svg.ico{width:15px;height:15px;vertical-align:-2px}

/* 二级导航：当前分组内的子页面，横向 tab（视图切换不属于此层） */
.subnav{position:sticky;top:56px;z-index:25;background:var(--paper-2);border-bottom:1px solid var(--line)}
.subnav-inner{
  max-width:var(--content-max);margin:0 auto;padding:0 32px;
  display:flex;gap:4px;overflow-x:auto;-webkit-overflow-scrolling:touch;
}
.subnav-a{
  display:inline-flex;align-items:center;gap:6px;padding:10px 14px;
  font-size:13.5px;color:var(--ink-soft);text-decoration:none;white-space:nowrap;
  border-bottom:2px solid transparent;transition:color var(--dur-1) var(--ease-out);
}
.subnav-a:hover{color:var(--ink);text-decoration:none}
.subnav-a.active{color:var(--pku-red);font-weight:600;border-bottom-color:var(--pku-red)}
.subnav-a .ico{width:16px;height:16px;opacity:.9}

.topbar{
  height:60px;background:var(--paper-2);border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;padding:0 26px;
  position:sticky;top:0;z-index:5;
}
.topbar .page-title{font-family:var(--serif);font-size:19px;color:var(--ink);font-weight:600}
.topbar .user{display:flex;align-items:center;gap:12px}
.topbar .user .name{font-size:14px;color:var(--ink-soft)}
.topbar .user .role-tag{
  font-size:11px;padding:2px 9px;border-radius:20px;background:var(--red-bg);color:var(--pku-red);font-weight:600;
}
.content{padding:26px 32px;max-width:var(--content-max);width:100%;margin:0 auto}
/* ---------- 移动端抽屉导航 ---------- */
.topbar-left{display:flex;align-items:center;min-width:0;flex:1}
.menu-btn{
  display:none;align-items:center;justify-content:center;width:40px;height:40px;margin-right:6px;padding:0;
  border:none;background:transparent;border-radius:9px;color:var(--ink);flex-shrink:0;
}
.menu-btn:hover{background:var(--gray-bg)}
.menu-btn .bars{display:block;width:20px;height:2px;background:currentColor;position:relative}
.menu-btn .bars::before,.menu-btn .bars::after{content:"";position:absolute;left:0;width:20px;height:2px;background:currentColor}
.menu-btn .bars::before{top:-6px}
.menu-btn .bars::after{top:6px}
.nav-mask{position:fixed;inset:0;background:rgba(30,20,15,.45);z-index:44;opacity:0;visibility:hidden;transition:opacity .22s}
.nav-mask.show{opacity:1;visibility:visible}

@media(max-width:780px){
  /* 侧边栏由「直接隐藏」改为「抽屉滑出」——原实现无任何替代导航，移动端等于没有菜单 */
  .menu-btn{display:flex}
  .sidebar{
    position:fixed;left:0;top:0;bottom:0;width:272px;max-width:84vw;height:100vh;z-index:45;
    transform:translateX(-100%);transition:transform .25s ease;
  }
  .sidebar.open{transform:translateX(0);box-shadow:6px 0 28px rgba(0,0,0,.28)}
  /* 顶栏收紧：标题过长省略；用户名保留（超长省略），角色与操作按钮移出顶栏 */
  .topbar{padding:0 14px;gap:10px}
  .topbar .page-title{font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .topbar .user{gap:8px;flex:0 0 auto;min-width:0}
  .topbar .user .name{display:block;font-size:13px;max-width:34vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .topbar .user .role-tag{display:none}
  .topbar .user .user-ops{display:none}
  .content{padding:14px}
  /* 宽内容横向滚动，避免表格挤出屏幕；日历改为自适应（见文末移动端日历规则） */
  .card{overflow-x:auto}
  table{min-width:520px}
  /* 弹窗贴边、内部可滚动 */
  .modal-mask{padding:12px}
  .modal{padding:18px;max-height:88vh}
  /* iOS 聚焦输入框会整页放大，字号需 >= 16px */
  .form-row input,.form-row select,.form-row textarea{font-size:16px}
  /* 触摸目标放大 */
  .btn.xs{padding:6px 11px}
  .filter-bar select{padding:9px 11px;font-size:15px}
  /* 顶部导航：移动端收紧，一级横排、二级横滚 */
  .hdr{height:52px;padding:0 14px;gap:10px}
  .hdr-brand-txt{display:none}
  .hdr-nav{gap:0;overflow-x:auto}
  .hdr-nav-a{padding:8px 10px;font-size:14px}
  .hdr-nav-a.active::after{left:10px;right:10px;bottom:-7px}
  .hdr-name,.hdr-role{display:none}
  .hdr-right{gap:8px}
  .hdr-ops .btn.xs{padding:6px 9px;font-size:12px}
  .subnav{top:52px}
  .subnav-inner{padding:0 14px}
  .content{padding:16px 14px}
}

/* ---------- 卡片 / 通用 ---------- */
.card{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin-bottom:18px}
.card h3{font-family:var(--serif);font-size:17px;color:var(--ink);margin-bottom:14px;display:flex;align-items:center;gap:8px}
.card h3 .bar{width:4px;height:18px;background:var(--pku-red);border-radius:2px;display:inline-block}
.grid{display:grid;gap:16px}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
@media(max-width:780px){.grid.cols-2,.grid.cols-3{grid-template-columns:1fr}}
.stat{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.stat .num{font-family:var(--serif);font-size:30px;color:var(--pku-red);line-height:1}
.stat .lbl{font-size:13px;color:var(--ink-soft);margin-top:8px}
.stat .num.green{color:var(--green)}
/* 移动端：统计卡竖排会占满一屏，压成单行横条（可横向滑动） */
@media(max-width:780px){
  .stat-grid{
    display:flex;gap:0;overflow-x:auto;-webkit-overflow-scrolling:touch;
    background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);margin-bottom:14px;
  }
  .stat-grid .stat{
    flex:0 0 auto;background:none;border:0;box-shadow:none;border-radius:0;
    padding:9px 14px;display:flex;align-items:baseline;gap:6px;border-right:1px solid var(--line);
  }
  .stat-grid .stat:last-child{border-right:0}
  .stat-grid .stat .num{font-size:16px}
  .stat-grid .stat .lbl{font-size:12px;margin-top:0}
}

/* ---------- 表格 ---------- */
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--line)}
th{font-size:12.5px;color:var(--ink-soft);font-weight:600;background:var(--paper);border-bottom:2px solid var(--line-strong)}
tbody tr:hover{background:var(--paper)}
td .meta{color:var(--gray);font-size:12.5px}

/* ---------- 徽章 / 标签 ---------- */
.badge{display:inline-block;padding:3px 11px;border-radius:20px;font-size:12px;font-weight:600}
.badge.gray{background:var(--gray-bg);color:var(--gray)}
.badge.green{background:var(--green-bg);color:var(--green)}
.badge.red{background:var(--red-bg);color:var(--pku-red)}
.badge.gold{background:#fbf2dc;color:var(--pku-gold)}
.tag{display:inline-block;padding:2px 9px;border-radius:6px;font-size:12px;background:var(--paper);border:1px solid var(--line-strong);color:var(--ink-soft);margin-right:6px}
.chip{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:8px;font-size:12.5px;color:#fff;font-weight:600}

/* ---------- 日历 ---------- */
.cal-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.cal-head .month{font-family:var(--serif);font-size:20px;color:var(--ink)}
.cal-nav{display:flex;align-items:center;gap:8px}
.cal-nav .month{min-width:158px;text-align:center}
.today-btn{font-weight:600}
.view-toggle{display:inline-flex;border:1px solid var(--line-strong);border-radius:9px;overflow:hidden}
.view-toggle button{background:#fff;border:none;padding:7px 14px;font-size:13px;color:var(--ink-soft)}
.view-toggle button.active{background:var(--pku-red);color:#fff}
.weekdays{display:grid;grid-template-columns:repeat(7,1fr);gap:8px;margin-bottom:8px}
.weekdays div{text-align:center;font-size:13px;color:var(--ink-soft);font-weight:600;padding:4px 0}
/* 月视图：桌面为「等高网格 + 右侧议程面板」双栏 */
.cal-wrap{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:18px;align-items:start}
.cal-main{min-width:0;position:relative}
.cal-grid{
  display:grid;grid-template-columns:repeat(7,1fr);grid-auto-rows:1fr;gap:8px;
  min-height:calc(100vh - 280px);
}
.cal-cell{
  min-height:0;border:1px solid var(--line);border-radius:10px;padding:7px;background:var(--paper-2);
  display:flex;flex-direction:column;gap:3px;overflow:hidden;cursor:pointer;
  -webkit-tap-highlight-color:transparent;
  transition:border-color var(--dur-1) var(--ease-out),background var(--dur-1) var(--ease-out);
}
.cal-cell:hover{border-color:var(--line-strong)}
.cal-cell.other{background:transparent}
.cal-cell.other .d{color:var(--line-strong)}
.cal-cell .d{font-size:12.5px;color:var(--ink-soft);font-weight:600;font-variant-numeric:tabular-nums;line-height:1.2}
.cal-cell.today{border-color:var(--pku-red)}
.cal-cell.today .d{color:var(--pku-red);font-weight:700}
.cal-cell.active{background:var(--red-bg);border-color:var(--pku-red)}
/* 课程以 20px 色条呈现，最多 2 条 + 「+N」，保证格子高度恒定、不再错行 */
.evt{
  display:flex;align-items:center;gap:5px;height:18px;padding:0 5px;border-radius:5px;
  background:var(--c,var(--pku-red));color:#fff;font-size:10.5px;overflow:hidden;
  cursor:pointer;text-decoration:none;flex-shrink:0;
}
.evt:hover{text-decoration:none;filter:brightness(1.08)}
.evt .evt-t{font-family:var(--mono);font-size:9.5px;opacity:.92;flex-shrink:0}
.evt .evt-n{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:500}
.evt-more{font-size:10px;color:var(--gray);font-weight:600;padding-left:2px;flex-shrink:0}
/* 课程块容器（桌面显示色条，移动端切换为色点） */
.evt-list{display:flex;flex-direction:column;gap:3px;min-width:0}
.evt-dots{display:none;gap:3px;justify-content:center;align-items:center;min-height:8px}
.evt-dots i{width:6px;height:6px;border-radius:50%;display:block;flex-shrink:0}
.evt-dots .dot-more{width:auto;height:auto;background:transparent;color:var(--gray);font-size:9.5px;font-style:normal;line-height:1;font-weight:600}
/* 移动端「当天安排」面板：单栏时回到网格下方 */
.cal-agenda{
  background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px;box-shadow:var(--shadow);
}
/* ---------- 月视图 hover 浮层（桌面） ---------- */
.cal-pop{
  position:absolute;z-index:30;width:300px;max-height:330px;overflow:auto;
  background:var(--paper-2);border:1px solid var(--line);border-radius:12px;
  box-shadow:var(--shadow-lg);padding:12px 13px;pointer-events:none;
  opacity:0;transform:translateY(4px);
  transition:opacity .14s var(--ease-out),transform .14s var(--ease-out);
}
.cal-pop[hidden]{display:none}
.cal-pop.show{opacity:1;transform:translateY(0)}
.pp-head{
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  font-size:13px;font-weight:700;color:var(--ink);
  padding-bottom:8px;margin-bottom:6px;border-bottom:1px solid var(--line);
}
.pp-n{font-size:11.5px;color:var(--gray);font-weight:500}
.pp-item{display:flex;align-items:baseline;gap:8px;padding:5px 0;font-size:12.5px;line-height:1.35}
.pp-item + .pp-item{border-top:1px dashed var(--line)}
.pp-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0;transform:translateY(-1px)}
.pp-cn{flex:1;min-width:0;color:var(--ink);font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pp-m{flex-shrink:0;color:var(--gray);font-size:11px;font-variant-numeric:tabular-nums}
.pp-more{padding-top:6px;color:var(--gray);font-size:11.5px}
@media(max-width:1100px){.cal-pop{display:none!important}}
@media(max-width:1100px){
  .cal-wrap{grid-template-columns:1fr}
  .cal-grid{min-height:min(52vh,480px)}
}
.ag-head{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.ag-title{font-family:var(--serif);font-size:16.5px;color:var(--ink);font-weight:600}
.ag-count{margin-left:auto;font-size:12px;color:var(--pku-red);font-weight:600}
.ag-body{display:flex;flex-direction:column;gap:10px}
.ag-empty{padding:16px;text-align:center;color:var(--gray);font-size:13.5px;border:1px dashed var(--line);border-radius:10px;background:var(--paper)}
.ag-item{border:1px solid var(--line);border-left-width:4px;border-radius:10px;padding:12px;background:#fff}
.ag-t{display:flex;align-items:center;gap:7px;flex-wrap:wrap}
.ag-dot{width:9px;height:9px;border-radius:50%;flex-shrink:0}
.ag-cn{font-weight:700;font-size:15px;line-height:1.35;word-break:break-word}
.ag-seq{font-size:11.5px;padding:1px 7px;border-radius:6px;background:var(--gray-bg);color:var(--ink-soft)}
.ag-m{font-size:12.5px;color:var(--gray);margin-top:4px;line-height:1.5}
.ag-ops{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:10px}
.ag-ops .btn{padding:9px 0;font-size:13px}
/* 周视图 */
.week-col{display:flex;flex-direction:column;gap:8px}
.week-row{display:grid;grid-template-columns:64px 1fr;gap:10px;align-items:stretch}
.week-time{
  font-size:12px;color:var(--ink-soft);text-align:right;padding-top:6px;
  display:flex;flex-direction:column;align-items:flex-end;gap:1px;
}
.week-time .wt-d{font-size:13px;font-weight:600;color:var(--ink)}
.week-time .wt-w{font-size:11.5px;color:var(--gray)}
.week-row.today .week-time .wt-d{color:var(--pku-red)}
.week-body{min-height:40px}
.week-none{color:var(--gray);font-size:13px;padding:8px 0}
/* 列表视图 */
.list-item{display:flex;align-items:center;gap:14px;padding:13px 4px;border-bottom:1px solid var(--line)}
.list-item:last-child{border-bottom:none}
.list-item .date-box{width:54px;text-align:center;flex-shrink:0}
.list-item .date-box .m{font-size:12px;color:var(--pku-red)}
.list-item .date-box .d{font-family:var(--serif);font-size:24px;color:var(--ink);line-height:1}
.list-item .info{flex:1;min-width:0}
.list-item .info .tt{font-weight:600;font-size:15px}
.list-item .info .mt{font-size:12.5px;color:var(--gray);margin-top:2px}

/* ---------- 首页近期课程（日历式跳转入口） ---------- */
.card h3 .card-more{margin-left:auto;font-family:var(--sans);font-size:12.5px;font-weight:500;color:var(--pku-red);text-decoration:none}
.card h3 .card-more:hover{text-decoration:underline}
a.date-box{text-decoration:none;color:inherit;display:block}
a.date-box:hover .d{color:var(--pku-red)}
.day-tag{display:inline-block;margin-left:7px;padding:1px 7px;border-radius:6px;background:var(--red-bg);color:var(--pku-red);font-size:11.5px;font-weight:600;vertical-align:1px}
.day-tag.today{background:var(--pku-red);color:#fff}
.up-cnt{margin-left:8px;color:var(--ink-soft)}
.up-item{flex-wrap:wrap;gap:10px}
.up-actions{display:flex;gap:6px;flex-shrink:0}
.up-actions .btn{padding:4px 9px;font-size:12px}
@media(max-width:780px){
  .up-item{flex-wrap:wrap;gap:8px}
  .up-actions{display:grid;grid-template-columns:1fr 1fr 54px;width:100%;gap:8px;margin-top:4px}
  .up-actions .btn{padding:9px 0;font-size:13px}
  .up-item .info .mt{line-height:1.5}
  .up-cnt{display:block;margin-left:0;margin-top:2px}
}

/* ---------- 考试提醒 ---------- */
.exam-card{margin-top:22px;border-color:rgba(200,17,46,.35);background:linear-gradient(180deg,#fffafa 0,var(--paper-2) 60%)}
.exam-card h3 .exam-sum{margin-left:auto;font-family:var(--sans);font-size:12.5px;font-weight:500;color:var(--gray)}
.exam-list{display:flex;flex-direction:column;gap:10px}
.exam-item{display:flex;align-items:center;gap:14px;padding:11px 14px;border:1px solid var(--line);border-radius:10px;background:#fff}
.exam-item.soon{border-color:var(--pku-red);background:var(--red-bg)}
.exam-item.done{opacity:.62}
.exam-item .exam-date{width:54px;text-align:center;flex-shrink:0}
.exam-item .exam-date .m{font-size:12px;color:var(--pku-red)}
.exam-item .exam-date .d{font-family:var(--serif);font-size:24px;color:var(--ink);line-height:1}
.exam-item .info{flex:1;min-width:0}
.exam-item .info .tt{font-weight:600;font-size:15px}
.exam-item .info .mt{font-size:12.5px;color:var(--gray);margin-top:2px}
.exam-tag{background:var(--pku-red);color:#fff}
.exam-item.done .exam-tag{background:#9aa0a6}
.exam-cell{color:var(--pku-red);font-weight:600}
.gray{color:var(--gray)}
@media(max-width:780px){
  .exam-item{flex-wrap:wrap;gap:10px}
  .exam-item .up-actions{display:grid;grid-template-columns:1fr;width:100%;gap:8px}
  .exam-item .up-actions .btn{padding:9px 0;font-size:13px}
}

.course-block{margin-bottom:22px}
.course-head{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.course-head .dot{width:14px;height:14px;border-radius:4px}
.course-head .cn{font-family:var(--serif);font-size:18px;color:var(--ink)}
.course-head .cr{font-size:12.5px;color:var(--gray)}
.week-sub{font-size:13px;color:var(--pku-red);font-weight:600;margin:10px 0 8px;padding-left:8px;border-left:3px solid var(--pku-red)}
.empty-inline{padding:16px 14px;border:1px dashed var(--line);border-radius:10px;color:var(--gray);font-size:13.5px;background:var(--paper);margin-bottom:8px}
.mat-item{display:flex;align-items:flex-start;gap:12px;padding:13px 14px;border:1px solid var(--line);border-radius:12px;background:var(--paper-2);margin-bottom:10px;box-shadow:var(--shadow);transition:box-shadow .15s,border-color .15s}
.mat-item:hover{border-color:var(--line-strong);box-shadow:0 4px 14px rgba(40,30,20,.1)}
.mat-item .mi-ico{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:700;flex-shrink:0;line-height:1;margin-top:1px}
.mat-item .mi-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:5px}
.mat-item .mi-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;min-width:0}
.mat-item .mi-title{font-weight:700;font-size:15px;word-break:break-word;line-height:1.35;color:var(--ink);flex:1;min-width:0}
.mat-item .mi-head .tag{flex-shrink:0}
.mat-item .mi-meta{font-size:12px;color:var(--gray);line-height:1.4}
/* 发布人 + 北京时间发布时间（资料 / 作业共用） */
.mi-by{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:4px;font-size:11.5px;color:var(--gray);opacity:.9}
.mi-by span{white-space:nowrap}
.mat-item .mi-files{display:flex;flex-wrap:wrap;gap:8px;margin-top:2px}
/* 附件图片缩略框（资料 / 作业共用，不要挂在 .mat-item 下：作业卡用的是 .asg-card，会失配）
   固定方框 + object-fit:contain → 任意长宽比都等比完整显示，既不变形也不裁切；
   flex:0 0 auto 防止 flex 收缩把方框压扁。 */
.mi-thumb{flex:0 0 auto;display:flex;align-items:center;justify-content:center;width:160px;height:160px;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;cursor:zoom-in}
.mi-thumb img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain}
.mat-item .mi-file{display:inline-flex;align-items:center;gap:8px;padding:6px 11px;border:1px solid var(--line);border-radius:9px;font-size:13px;background:#fff;color:var(--ink);text-decoration:none;max-width:100%}
.mat-item .mi-file:hover{border-color:var(--pku-red);background:var(--red-bg);text-decoration:none}
.mat-item .mi-file-ico{flex-shrink:0;font-size:15px}
.mat-item .mi-file-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500}
.mat-item .mi-file-size{color:var(--gray);font-size:12px;flex-shrink:0}

/* ---------- 表单 / 模态 ---------- */
/* 统一控件基底：任何 .f 都有一致的边框 / 圆角 / 字体，避免脱离 .form-row 后掉回浏览器原生样式。
   放在 .form-row 规则之前，保证弹窗内表单维持原有尺寸（后者特异性更高、后定义者胜）。 */
input.f,select.f,textarea.f{
  padding:9px 11px;border:1px solid var(--line-strong);border-radius:9px;
  font-size:13.5px;font-family:inherit;background:#fff;color:var(--ink);
  transition:border-color .15s;
}
input.f:focus,select.f:focus,textarea.f:focus{outline:none;border-color:var(--pku-red)}
select.f{cursor:pointer}
textarea.f{resize:vertical;min-height:80px}
.modal-mask{position:fixed;inset:0;background:rgba(30,20,15,.45);display:flex;align-items:center;justify-content:center;z-index:50;padding:20px}
.modal{background:var(--paper-2);border-radius:16px;width:100%;max-width:520px;padding:26px;box-shadow:var(--shadow-lg);max-height:90vh;overflow:auto}
.modal h3{font-family:var(--serif);font-size:19px;color:var(--ink);margin-bottom:18px}
.form-row{margin-bottom:15px}
.form-row label{display:block;font-size:13px;color:var(--ink-soft);margin-bottom:6px}
.form-row input,.form-row select,.form-row textarea{
  width:100%;padding:10px 12px;border:1px solid var(--line-strong);border-radius:9px;font-size:14px;font-family:inherit;background:#fff;
}
.form-row textarea{resize:vertical;min-height:80px}
.form-row input:focus,.form-row select:focus,.form-row textarea:focus{outline:none;border-color:var(--pku-red)}

/* 模态框上传/提交加载遮罩 */
.modal-loading{position:fixed;inset:0;z-index:60;background:rgba(250,247,242,.82);backdrop-filter:blur(2px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px}
.modal-loading .ml-spin{width:42px;height:42px;border:4px solid var(--red-bg);border-top-color:var(--pku-red);border-radius:50%;animation:mlspin .8s linear infinite}
.modal-loading .ml-msg{font-family:var(--serif);font-size:15px;color:var(--ink);font-weight:600;text-align:center;max-width:80vw}
.modal-loading .ml-bar{width:260px;max-width:70vw;height:8px;border-radius:6px;background:var(--red-bg);overflow:hidden}
.modal-loading .ml-bar-fill{height:100%;width:0;background:linear-gradient(90deg,var(--pku-red),var(--pku-red-dark));transition:width .15s ease}
.modal-loading .ml-pct{font-size:13px;color:var(--gray)}
@keyframes mlspin{to{transform:rotate(360deg)}}
.form-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:8px}
.empty{padding:40px;text-align:center;color:var(--gray)}
.empty .big{font-size:40px;margin-bottom:12px;line-height:1}
.empty .big svg.ico-lg{color:var(--gray);opacity:.42}
.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:11px 20px;border-radius:10px;font-size:14px;box-shadow:var(--shadow-lg);z-index:99;opacity:0;transition:opacity .25s,transform .25s;pointer-events:none}
.toast.show{opacity:1;transform:translateX(-50%) translateY(-4px)}
.page-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;flex-wrap:wrap;gap:10px}
.page-head h2{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.page-head h2 .bar{width:4px;height:20px;background:var(--pku-red);border-radius:2px;display:inline-block;flex:0 0 auto}
.muted{color:var(--gray)}
.row-gap{display:flex;gap:10px;flex-wrap:wrap}
/* 筛选条吸顶：毛玻璃 + 圆角，滚动时筛选状态始终可见 */
.filter-bar{
  display:flex;gap:10px;flex-wrap:wrap;align-items:center;
  position:sticky;top:100px;z-index:15;
  background:rgba(247,243,236,.9);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  padding:10px 12px;margin:0 -12px 16px;border-radius:12px;border:1px solid var(--line);
}
.filter-bar select{padding:8px 11px;border:1px solid var(--line-strong);border-radius:9px;font-size:13.5px;background:#fff}
/* 筛选条内搜索框：与 select 同款外观，前置放大镜图标 */
.filter-bar .fb-search{position:relative;display:flex;align-items:center;flex:0 1 220px;min-width:170px}
.filter-bar .fb-search .ico{position:absolute;left:9px;width:15px;height:15px;color:var(--gray);pointer-events:none}
.filter-bar .fb-search input{
  width:100%;padding:8px 11px 8px 30px;border:1px solid var(--line-strong);border-radius:9px;
  font-size:13.5px;background:#fff;font-family:inherit;color:var(--ink);transition:border-color .15s;
}
.filter-bar .fb-search input:focus{outline:none;border-color:var(--pku-red)}
/* 筛选条内标签 chips：胶囊形，hover 描边变红，选中为北大红实心 */
.filter-bar .fb-chips{display:flex;flex-wrap:wrap;gap:7px;align-items:center}
.filter-bar .fb-chip{
  display:inline-flex;align-items:center;gap:5px;padding:5px 11px;border-radius:999px;font-size:12.5px;
  border:1px solid var(--line-strong);background:#fff;color:var(--ink-soft);
  cursor:pointer;user-select:none;font-family:inherit;transition:border-color .15s,color .15s,background .15s;
}
.filter-bar .fb-chip:hover{border-color:var(--pku-red);color:var(--pku-red)}
.filter-bar .fb-chip.active{background:var(--pku-red);border-color:var(--pku-red);color:#fff}
.filter-bar .fb-count{font-size:12.5px;color:var(--gray);margin-left:auto;white-space:nowrap}
.kvs{display:grid;grid-template-columns:96px 1fr;gap:8px 12px;font-size:14px}
.kvs .k{color:var(--ink-soft)}

/* ---------- 作业附件 ---------- */
.att-block{margin-top:10px;padding-top:10px;border-top:1px dashed var(--line)}
.mi-files{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
/* asg-card（课程资料 / 课后作业卡片）内附件：图片 3 列网格，文件跨整行，避免 flex-wrap 造成的错行与空白 */
.asg-card .mi-files{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.asg-card .mi-files .mi-thumb{width:auto;height:auto;aspect-ratio:1/1;min-height:90px;max-height:160px}
.asg-card .mi-files .mi-file{grid-column:1/-1;max-width:none;width:auto}
.asg-card .mi-files .mi-file-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.att-empty{display:flex;align-items:center;gap:6px;padding:8px 10px;border:1px dashed var(--green);border-radius:8px;background:#fff;font-size:13px;color:var(--green);margin-top:6px}
.att-empty .ico{width:14px;height:14px;color:var(--green)}
.mi-img{max-width:220px;max-height:160px;border-radius:8px;border:1px solid var(--line);object-fit:cover}
.mi-file{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border:1px solid var(--line);border-radius:8px;font-size:13px;color:var(--ink);text-decoration:none;background:#fff}
.mi-file:hover{border-color:var(--red);color:var(--red)}
.att-hint{font-size:12px;color:var(--gray);margin:2px 0 4px}
.att-note{font-size:13px;color:var(--ink-soft);margin-bottom:6px;background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:8px 10px}
.att-list{display:flex;flex-direction:column;gap:6px}
.att-item{display:flex;align-items:center;gap:8px;padding:7px 10px;border:1px solid var(--line-strong);border-radius:9px;background:#fff;font-size:13px;color:var(--ink);text-decoration:none}
.att-item:hover{background:var(--red-bg);text-decoration:none;border-color:var(--pku-red)}
.att-ico{flex-shrink:0}
.att-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}
.att-size{color:var(--gray);font-size:12px;flex-shrink:0}
.att-chip{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:6px 10px;border:1px solid var(--line-strong);border-radius:9px;background:#fff;font-size:13px}
.att-chip.new{background:var(--green-bg);border-color:var(--green)}
.att-chip .att-x{border:none;background:transparent;color:var(--pku-red);font-size:16px;line-height:1;cursor:pointer;padding:0 4px}

/* ---------- 作业页（按课程/周次分组） ---------- */
.asg-grid{display:grid;grid-template-columns:1fr;gap:12px}
.asg-card{background:var(--paper-2);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:16px;transition:box-shadow .15s,border-color .15s}
.asg-card:hover{border-color:var(--line-strong);box-shadow:0 4px 14px rgba(40,30,20,.1)}
.asg-header{display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 10px;margin-bottom:12px;align-items:flex-start;min-width:0}
.asg-title-wrap{display:flex;flex-direction:column;align-items:flex-start;gap:6px;flex:1;min-width:0}
.asg-title{font-family:var(--serif);font-size:16px;font-weight:700;color:var(--ink);line-height:1.45;width:100%;min-width:0;word-break:break-word;overflow-wrap:break-word;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.asg-title .title-dot{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:7px;vertical-align:0.05em;flex-shrink:0}
.asg-toggle{flex-shrink:0;margin-left:auto}
.asg-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:12.5px;color:var(--gray)}
.asg-meta .due{color:var(--ink-soft)}
.asg-meta .sub-count{color:var(--pku-red);font-weight:600}
.asg-body{margin-bottom:12px;padding:12px;background:var(--paper);border:1px dashed var(--line);border-radius:10px;min-width:0}
.asg-section-title{font-size:12px;color:var(--gray);font-weight:600;margin-bottom:6px;letter-spacing:.3px}
.asg-desc{font-size:14px;color:var(--ink-soft);line-height:1.6;white-space:pre-wrap;word-break:break-word;overflow-wrap:break-word;min-width:0}
.asg-section{margin-top:12px;padding-top:12px;border-top:1px solid var(--line);min-width:0}
.asg-card .mi-file{max-width:100%;width:100%;min-width:0}
.asg-card .mi-file .mi-file-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500}
.asg-section.mine{background:var(--green-bg);border:1px solid var(--green);border-radius:10px;padding:12px;margin-top:14px}
.asg-section.mine .asg-section-title{color:var(--green)}
.asg-section.mine .att-note{background:#fff;border-color:var(--green)}
.asg-footer{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px;align-items:center}
.count-chip{font-size:12px;color:var(--gray);background:var(--gray-bg);padding:2px 10px;border-radius:20px;margin-left:auto}

/* ---------- 卡片展开 / 收起 ---------- */
.asg-toggle{flex-shrink:0;width:26px;height:26px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:var(--paper);border-radius:7px;color:var(--gray);cursor:pointer;font-size:12px;line-height:1;margin-left:auto;transition:transform .2s ease,border-color .15s,color .15s;user-select:none;-webkit-user-select:none}
.asg-toggle:hover{border-color:var(--pku-red);color:var(--pku-red)}
.asg-toggle.collapsed{transform:rotate(-90deg)}
.asg-detail{display:grid;grid-template-rows:1fr;transition:grid-template-rows .25s ease}
.asg-detail-inner{overflow:hidden;min-width:0;min-height:0}
.asg-detail.collapsed{grid-template-rows:0fr}
/* 卡片收起：默认展开，收起后仅保留标题一行（隐藏说明 / 附件 / 课次元信息 / 发布人） */
.asg-card.collapsed .asg-body,
.asg-card.collapsed .asg-detail,
.asg-card.collapsed .asg-meta,
.asg-card.collapsed .mi-by{display:none}
.asg-card.collapsed .asg-title{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ---------- 日历事件关联入口（周视图 / 列表视图的事件卡片） ---------- */
.cal-evt-row{flex-direction:row;align-items:center;justify-content:space-between;gap:10px;padding:9px 12px;border-radius:9px;color:#fff;margin-bottom:6px}
.cal-evt-main{display:flex;flex-direction:column;gap:2px;flex:1;min-width:0}
.cal-evt-main strong{font-size:15px;line-height:1.4}
.cal-evt-main span{font-size:12.5px;opacity:.92;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cal-evt-main span.cev-line{white-space:nowrap}
.cal-evt-main span.cev-desc{white-space:normal;overflow:visible;text-overflow:clip;opacity:.82;font-size:11.5px;line-height:1.45}
.sess-summary{max-width:200px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cal-evt-actions{display:flex;gap:6px;flex-shrink:0}
.cal-evt-actions .btn{padding:4px 9px;font-size:12px}
.cal-evt-actions .btn.ghost{border-color:rgba(255,255,255,.6);color:#fff;background:rgba(255,255,255,.1)}
.cal-evt-actions .btn.ghost:hover{background:rgba(255,255,255,.22)}
.cal-list-item .cal-evt-actions{flex-direction:column}
@media(max-width:780px){
  .cal-evt-actions{flex-wrap:wrap}
  .cal-list-item{flex-wrap:wrap}
  .cal-list-item .cal-evt-actions{flex-direction:row;width:100%;justify-content:stretch;margin-top:6px}
  .cal-list-item .cal-evt-actions .btn{flex:1;padding:9px 0;font-size:13px;border-color:var(--line-strong);color:var(--ink);background:#fff}
  .cal-list-item .cal-evt-actions .btn:first-child{background:var(--pku-red);color:#fff;border-color:var(--pku-red)}

  /* ===== 移动端日历：紧凑月历 + 点日期看当天安排 ===== */
  .cal-head{flex-direction:column;align-items:stretch;gap:10px;margin-bottom:12px}
  .view-toggle{display:flex;width:100%}
  .view-toggle a{flex:1}
  .view-toggle button{width:100%;padding:10px 0;font-size:14px}
  .cal-nav{gap:6px}
  .cal-nav .month{flex:1;min-width:0;font-size:15.5px}
  .cal-nav .tx{display:none}
  .cal-nav .btn{min-height:36px;min-width:44px;padding:6px 10px;font-size:15px}
  .cal-nav .today-btn{min-width:52px}
  .weekdays{gap:4px;margin-bottom:6px}
  .weekdays div{font-size:12px;padding:2px 0}
  .cal-grid{gap:4px;min-width:0}
  .cal-cell{
    min-height:48px;padding:6px 2px 5px;align-items:center;gap:2px;border-radius:9px;
    cursor:pointer;-webkit-tap-highlight-color:transparent;
  }
  .cal-cell .d{font-size:13.5px;line-height:1.15}
  .cal-cell.has-evt .d{color:var(--ink);font-weight:700}
  .cal-cell .evt-list{display:none}
  .cal-cell .evt-dots{display:flex;margin-top:1px}
  .cal-cell.active{background:var(--red-bg);box-shadow:inset 0 0 0 2px var(--pku-red)}
  .cal-agenda{margin-top:14px}

  /* 周视图：窄屏纵向堆叠，事件卡片化 */
  .week-col{gap:6px}
  .week-row{grid-template-columns:1fr;gap:6px;padding:10px 0;border-bottom:1px solid var(--line)}
  .week-row:last-child{border-bottom:none}
  .week-time{flex-direction:row;align-items:center;justify-content:flex-start;gap:6px;padding-top:0}
  .week-body{min-height:0}
  .week-none{padding:2px 0 6px}
  .cal-evt-row{flex-direction:column;align-items:stretch;gap:10px;padding:12px;margin-bottom:8px}
  .cal-evt-main span.cev-line{white-space:normal;overflow:visible;line-height:1.5}
  .cal-evt-actions{width:100%;justify-content:stretch}
  .cal-evt-actions .btn{flex:1;padding:9px 0;font-size:13px}
}

/* ---------- 广场（活动 / 学习分享） ---------- */
.feed{display:flex;flex-direction:column;gap:18px}
.event-card,.share-card{padding:18px 20px}
.event-header,.share-header{margin-bottom:10px;min-width:0}
.feed-ops{display:flex;gap:6px;align-items:center;flex-shrink:0;margin-top:8px;flex-wrap:wrap}
.event-card h3,.share-card h3{font-size:17px;font-weight:600;margin-bottom:6px;display:flex;align-items:center;gap:8px;min-width:0}
.event-card h3 a,.share-card h3 a{color:var(--ink);display:block;flex:1;min-width:0;word-break:break-word;overflow-wrap:break-word}
.event-card h3 a:hover,.share-card h3 a:hover{color:var(--pku-red);text-decoration:none}
.event-meta,.share-meta{display:flex;flex-wrap:wrap;gap:10px 18px;font-size:12.5px;color:var(--ink-soft);margin-top:6px}
.event-body,.share-body{margin:12px 0;color:var(--ink);line-height:1.65;white-space:pre-wrap;word-break:break-word;overflow-wrap:break-word;min-width:0}
.event-files,.share-files{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.event-files .mi-file,.share-files .mi-file{max-width:100%}
.event-files .mi-file .mi-file-name,.share-files .mi-file .mi-file-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500}
.event-thumb,.share-thumb{width:120px;height:90px;border-radius:8px;overflow:hidden;border:1px solid var(--line);display:block;background:var(--paper)}
.event-thumb img,.share-thumb img{width:100%;height:100%;object-fit:cover}
.event-thumb-lg,.share-thumb-lg{width:220px;height:160px;border-radius:10px;overflow:hidden;border:1px solid var(--line);display:block;background:var(--paper)}
.event-thumb-lg img,.share-thumb-lg img{width:100%;height:100%;object-fit:cover}
.event-detail h1,.share-detail h1{font-family:var(--serif);font-size:22px;margin-bottom:8px}

/* ---------- 班级相册（朋友圈式） ---------- */
.moments{display:flex;flex-direction:column;gap:16px}
.moment{padding:16px 18px}
.mo-head{display:flex;align-items:center;gap:12px}
.mo-avatar{width:42px;height:42px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#fff;font-size:17px;font-weight:600}
.mo-who{flex:1;min-width:0}
.mo-name{font-size:15px;font-weight:600;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mo-time{font-size:12px;color:var(--gray);margin-top:2px}
.mo-ops{display:flex;gap:6px;flex-shrink:0}
.mo-title{font-family:var(--serif);font-size:16px;font-weight:600;margin:12px 0 4px;word-break:break-word;overflow-wrap:break-word;min-width:0}
.mo-text{margin:10px 0 2px;font-size:14.5px;color:var(--ink);line-height:1.7;white-space:pre-wrap;word-break:break-word}

/* 九宫格：1 图按原比例大图，2/4 图两列，其余三列（>9 张在第 9 格叠 +N） */
.pb-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;margin-top:10px;max-width:420px}
.pb-grid[data-n="1"]{display:block;max-width:none}
.pb-grid[data-n="1"] .pb-cell{max-width:min(58%,300px)}
.pb-grid[data-n="2"],.pb-grid[data-n="4"]{grid-template-columns:repeat(2,1fr);max-width:280px}
.pb-cell{position:relative;aspect-ratio:1/1;overflow:hidden;border-radius:6px;background:var(--gray-bg);border:1px solid var(--line);cursor:zoom-in}
.pb-cell img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .25s}
.pb-cell:hover img{transform:scale(1.03)}
.pb-cell:focus-visible{outline:2px solid var(--pku-red);outline-offset:2px}
.pb-more{position:absolute;inset:0;background:rgba(0,0,0,.45);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:600}

/* 高清查看灯箱 */
.lb{position:fixed;inset:0;z-index:300;background:rgba(18,16,14,.95);display:none;align-items:center;justify-content:center}
.lb.show{display:flex}
.lb-bar{position:absolute;top:0;left:0;right:0;height:52px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;color:#fff;font-size:14px;background:linear-gradient(rgba(0,0,0,.5),transparent)}
.lb-bar-ops{display:flex;align-items:center;gap:14px}
.lb-save{color:#fff;font-size:13.5px;opacity:.92}
.lb-save:hover{text-decoration:none;opacity:1}
.lb-x{background:none;border:0;color:#fff;font-size:22px;line-height:1;padding:6px}
.lb-stage{position:absolute;inset:52px 62px;display:flex;align-items:center;justify-content:center}
.lb-img{max-width:100%;max-height:100%;object-fit:contain;border-radius:4px;box-shadow:0 10px 40px rgba(0,0,0,.55)}
.lb-nav{position:absolute;top:50%;transform:translateY(-50%);width:46px;height:46px;border-radius:50%;border:0;background:rgba(255,255,255,.12);color:#fff;font-size:30px;line-height:1;display:flex;align-items:center;justify-content:center}
.lb-nav:hover{background:rgba(255,255,255,.24)}
.lb-prev{left:10px}
.lb-next{right:10px}

/* 发布 / 编辑弹窗中的照片上传区域 */
.al-upload-zone{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;border:2px dashed var(--line);border-radius:10px;padding:28px 16px;background:var(--gray-bg);color:var(--gray);cursor:pointer;transition:border-color .15s,background .15s,color .15s}
.al-upload-zone:hover{border-color:var(--pku-red);background:rgba(200,17,46,.04);color:var(--pku-red)}
.al-upload-zone .al-ico{font-size:34px;line-height:1}
.al-upload-zone .al-hint{font-size:14px;font-weight:500}
.al-upload-zone .al-sub{font-size:12px;opacity:.85}
.hidden-file-input{position:absolute;inset:0;opacity:0;width:100%;height:100%;cursor:pointer}

/* 发布 / 编辑弹窗中的照片预览 */
.al-chip-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.al-chip{position:relative;width:74px;height:74px;border-radius:8px;overflow:hidden;border:1px solid var(--line);background:var(--gray-bg)}
.al-chip img{width:100%;height:100%;object-fit:cover;display:block}
.al-x{position:absolute;top:2px;right:2px;width:20px;height:20px;padding:0;border-radius:50%;border:0;background:rgba(0,0,0,.55);color:#fff;font-size:13px;line-height:1;display:flex;align-items:center;justify-content:center}

/* ---------- 班级公告 ---------- */
.ann-card{padding:18px 20px}
.ann-card.pinned{border-color:rgba(184,134,11,.5);background:linear-gradient(180deg,#fffdf4 0,var(--paper-2) 55%)}
.ann-head h3{display:flex;align-items:center;gap:6px;font-family:var(--serif);font-size:17px;font-weight:600;margin-bottom:6px;min-width:0}
.ann-title{color:var(--ink);display:block;flex:1;min-width:0;word-break:break-word;overflow-wrap:break-word}
.ann-meta{display:flex;flex-wrap:wrap;gap:10px 18px;font-size:12.5px;color:var(--ink-soft)}
.ann-meta .m-full{display:none}
.ann-body{margin:12px 0 2px;color:var(--ink);line-height:1.7;white-space:pre-wrap;word-break:break-word;overflow-wrap:break-word;min-width:0}
.ann-foot{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);min-width:0}
.ann-due{font-size:12.5px;color:var(--gray)}

/* 长正文折叠（时间线里保持节奏整齐） */
.ann-body.folded{max-height:7.6em;overflow:hidden;-webkit-mask-image:linear-gradient(180deg,#000 62%,rgba(0,0,0,.15) 100%);mask-image:linear-gradient(180deg,#000 62%,rgba(0,0,0,.15) 100%)}
.ann-more{display:inline-flex;align-items:center;gap:4px;margin-top:10px;padding:0;background:none;border:0;font-family:inherit;font-size:13px;font-weight:500;color:var(--pku-red)}
.ann-more:hover{text-decoration:underline}
.ann-more .ico{width:14px;height:14px;transition:transform var(--dur-2) var(--ease-out)}
.ann-more.open .ico{transform:rotate(180deg)}

/* —— 时间线布局：日期 | 轴线 | 卡片 —— */
.tl{position:relative}
.tl::before{
  content:"";position:absolute;left:calc(78px + 11px);top:26px;bottom:34px;width:1px;
  background:linear-gradient(180deg,transparent 0,var(--line) 22px,var(--line) calc(100% - 22px),transparent 100%);
}
.tl-item{display:grid;grid-template-columns:78px 22px minmax(0,1fr)}
.tl-date{padding:18px 12px 0 0;text-align:right;min-width:0}
.tl-date b{display:block;font-family:var(--serif);font-size:23px;line-height:1;font-weight:600;color:var(--ink);letter-spacing:-.01em}
.tl-date .tl-year{display:block;font-size:11px;color:var(--gray);letter-spacing:.04em;margin-bottom:2px}
.tl-date .tl-mon{display:block;font-size:12px;color:var(--ink-soft);margin-top:5px;white-space:nowrap}
.tl-date .tl-time{display:block;font-size:11.5px;color:var(--gray);margin-top:1px;font-variant-numeric:tabular-nums}
.tl-axis{position:relative;display:flex;justify-content:center}
.tl-dot{
  width:11px;height:11px;margin-top:22px;border-radius:50%;flex-shrink:0;
  background:var(--paper-2);border:2px solid var(--line-strong);
  transition:background var(--dur-2),border-color var(--dur-2),box-shadow var(--dur-2);
}
.tl-item.is-pin .tl-dot{background:var(--pku-gold);border-color:var(--pku-gold);box-shadow:0 0 0 4px rgba(176,138,62,.15)}
.tl-body{min-width:0;padding-bottom:20px}
.tl-item:last-child .tl-body{padding-bottom:0}
.tl-body > .ann-card{box-shadow:var(--shadow)}
.tl-item.is-pin .tl-body > .ann-card{box-shadow:0 1px 2px rgba(20,22,27,.04),0 0 0 1px rgba(176,138,62,.18)}

/* 置顶标记：金色左条 + 📌 */
.pin-tag{font-size:13px;line-height:1;color:var(--pku-gold);flex-shrink:0}
.card.pinned{position:relative}
.card.pinned::before{content:"";position:absolute;left:0;top:16px;bottom:16px;width:3px;border-radius:0 3px 3px 0;background:var(--pku-gold)}

/* 完成倒计时 chip */
.count-chip{display:inline-flex;align-items:center;font-size:12.5px;font-weight:600;color:var(--pku-red);background:var(--red-bg);border-radius:999px;padding:2px 10px;white-space:nowrap}
.count-chip.soon{color:#8a6100;background:#fdf3d6}
.count-chip.done{color:var(--gray);background:var(--gray-bg);font-weight:500}

/* 首页公告模块 */
.ann-home{margin-top:18px}
.ann-home-item{align-items:flex-start}
.ann-home-title{color:var(--ink);font-weight:600;font-size:15px;word-break:break-word;overflow-wrap:break-word}
.ann-home-title:hover{color:var(--pku-red);text-decoration:none}
.ann-snippet{margin-top:4px;font-size:13px;color:var(--ink-soft);line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ann-home-item .count-chip{margin-left:8px}
.form-hint{font-size:12px;color:var(--gray);line-height:1.6;margin:-4px 0 14px}

@media(max-width:780px){
  .moment{padding:14px}
  .pb-grid{max-width:100%}
  .pb-grid[data-n="2"],.pb-grid[data-n="4"]{max-width:66%}
  .pb-grid[data-n="1"] .pb-cell{max-width:72%}
  .lb-stage{inset:52px 8px}
  .lb-nav{width:38px;height:38px;font-size:24px}
  .lb-prev{left:4px}
  .lb-next{right:4px}
  .mi-thumb{width:120px;height:120px}
  .ann-card{padding:15px 16px}
  .ann-head h3{font-size:16px}
  /* 时间线在窄屏退化为「轴 + 卡片」，日期并入 meta */
  .tl::before{left:11px;top:20px;bottom:24px}
  .tl-item{grid-template-columns:22px minmax(0,1fr)}
  .tl-date{display:none}
  .tl-dot{margin-top:20px}
  .tl-body{padding-bottom:14px}
  .ann-meta .m-full{display:inline}
  .ann-meta .m-short{display:none}
  .ann-body.folded{max-height:6.8em}
  .ann-thumb{width:calc(50% - 5px);height:104px}
  .ann-home-thumb{width:54px;height:42px}
  /* 卡片在窄屏下减少内边距，给正文多留宽度 */
  .asg-card,.event-card,.share-card{padding:14px 16px}
  .asg-title,.event-card h3,.share-card h3{font-size:16px}
  .feed-ops{width:100%;justify-content:flex-end;margin-top:6px}
  /* 作业卡移动端重构：标题独占一行，防止长标题被压成竖排 */
  .asg-card{padding:14px;border-radius:10px}
  .asg-title-wrap{display:flex;flex-direction:column;align-items:flex-start;width:100%}
  .asg-title{display:block;width:100%;line-height:1.45;overflow-wrap:anywhere}
  .asg-title-wrap .badge{margin-top:2px;display:inline-flex}
  .asg-meta{gap:6px 10px;font-size:12px}
  .asg-card{min-width:0}
  .asg-footer{gap:8px;width:100%;display:flex;flex-wrap:wrap}
  .asg-footer .btn{justify-content:center}
  .asg-footer .btn:not(.asg-export):not(.asg-op),
  .asg-footer .asg-export{flex:1 1 100%}
  .asg-footer .asg-op{flex:1 1 0;min-width:calc(50% - 4px)}
}

@media(max-width:420px){
  /* 超窄屏：筛选下拉与卡片底部按钮各占整行，避免挤成竖条 */
  .filter-bar select,.filter-bar .fb-search{flex:1 1 100%;min-width:0}
  /* 移动端纵向空间紧张，筛选条回到常规流（不吸顶） */
  .filter-bar{position:static;margin:0 0 14px;padding:0;border:0;background:none;backdrop-filter:none;-webkit-backdrop-filter:none}
  .page-head .btn{width:100%;margin-top:4px}
  .asg-footer .btn:not(.asg-op){flex:1 1 100%}
  .feed-ops .btn{flex:1 1 calc(50% - 3px);justify-content:center}
  /* 登录页标题在手机上强制一行，缩小字号与字距 */
  .login-card h1{font-size:21px;letter-spacing:.5px;white-space:nowrap}
}

/* ===== 课程信息页 ===== */
.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:16px;margin-top:14px}
.course-card{display:flex;flex-direction:column;min-width:0;padding:16px}
.course-head{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.course-head .dot{width:12px;height:12px;border-radius:3px;flex:0 0 auto}
.course-title{min-width:0}
.ct-name{font-weight:700;font-size:1.05rem;line-height:1.3}
.ct-sub{color:var(--gray,#8a8a8a);font-size:.85rem;margin-top:2px}
.course-empty{color:var(--gray,#8a8a8a);font-size:.9rem;padding:8px 0}
.course-foot{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px;padding-top:12px;border-top:1px solid var(--line,#eee)}

/* Markdown 正文 */
.md-body{font-size:.92rem;line-height:1.6;word-break:break-word}
.md-body > :first-child{margin-top:0}
.md-body > :last-child{margin-bottom:0}
.md-body h1,.md-body h2,.md-body h3{margin:14px 0 8px;line-height:1.3}
.md-body h1{font-size:1.1rem}
.md-body h2{font-size:1.02rem}
.md-body h3{font-size:.96rem}
.md-body p{margin:8px 0}
.md-body ul,.md-body ol{margin:8px 0;padding-left:1.4em}
.md-body li{margin:3px 0}
.md-body strong{color:var(--text,#222);font-weight:700}
.md-body a{color:var(--pku-red,#C8112E);text-decoration:underline}
.md-body code{background:#f3f3f3;padding:1px 5px;border-radius:4px;font-size:.86em}
.md-body table{border-collapse:collapse;width:100%;margin:10px 0;font-size:.88rem}
.md-body th,.md-body td{border:1px solid var(--line,#e3e3e3);padding:6px 8px;text-align:left;vertical-align:top}
.md-body th{background:#fafafa;font-weight:700}
.md-body blockquote{margin:8px 0;padding:4px 12px;border-left:3px solid var(--pku-red,#C8112E);color:var(--gray,#8a8a8a);background:#fcfcfc}

@media(max-width:780px){
  .course-grid{grid-template-columns:1fr}
  /* 课程信息页移动端优化 */
  .page-head .hint{text-align:left;flex-basis:100%;margin-top:0}
  .course-card{padding:14px 15px}
  .course-head{gap:8px;margin-bottom:10px}
  .ct-name{font-size:1rem}
  .course-foot{gap:8px;margin-top:14px;flex-wrap:nowrap}
  .course-foot .btn{flex:1 1 auto;justify-content:center;text-align:center;min-width:0;padding-left:4px;padding-right:4px}
  /* Markdown 表格窄屏可横向滚动，单元格允许断词，避免溢出 */
  .md-body > table{display:block;overflow-x:auto;max-width:100%}
  .md-body th,.md-body td{white-space:normal;word-break:break-word}
}

/* ===== 课程分组页 ===== */
.group-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.group-tab{display:inline-flex;align-items:center;gap:8px;padding:9px 14px;border-radius:10px;border:1px solid var(--line-strong);background:#fff;color:var(--ink);font-size:14px;font-weight:500;cursor:pointer;transition:background .15s,border-color .15s}
.group-tab:hover{background:var(--paper)}
.group-tab.active{background:var(--pku-red);color:#fff;border-color:var(--pku-red)}
.group-tab.active .tab-dot{background:#fff !important}
.group-tab .tab-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}
.group-pane{display:none}
.group-pane.active{display:block}
.group-summary{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.group-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.group-card{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.group-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}
.group-no{font-family:var(--serif);font-size:18px;font-weight:700;color:var(--ink)}
.group-leader{display:flex;align-items:center;gap:6px;background:var(--red-bg);border:1px solid rgba(200,17,46,.18);border-radius:20px;padding:4px 12px}
.group-leader .leader-label{font-size:11px;color:var(--pku-red);font-weight:600}
.group-leader .leader-name{font-size:14px;color:var(--ink);font-weight:700}
.group-body{border-top:1px solid var(--line);padding-top:12px}
.group-section-title{font-size:12px;color:var(--gray);margin-bottom:8px;font-weight:600}
.group-members{display:flex;flex-wrap:wrap;gap:8px}
.group-member{display:inline-block;padding:5px 10px;border-radius:8px;background:var(--paper);border:1px solid var(--line);font-size:13.5px;color:var(--ink);white-space:nowrap}
@media(max-width:780px){
  .group-tabs{gap:8px;overflow-x:auto;flex-wrap:nowrap;padding-bottom:4px;-webkit-overflow-scrolling:touch}
  .group-tab{flex:0 0 auto}
  .group-grid{grid-template-columns:1fr}
}

/* ===== 班委名单页 ===== */
.committee-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px;margin-top:14px}
.committee-card{display:flex;align-items:center;gap:14px;background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow)}
.committee-role{flex:0 0 auto;min-width:72px;font-family:var(--serif);font-size:15px;font-weight:700;color:var(--pku-red)}
.committee-divider{width:1px;align-self:stretch;background:var(--line-strong);flex:0 0 auto}
.committee-name{font-family:var(--serif);font-size:22px;font-weight:700;color:var(--ink);letter-spacing:1px}
@media(max-width:780px){
  .committee-grid{grid-template-columns:1fr}
  .committee-card{padding:14px 16px;gap:12px}
  .committee-role{min-width:68px;font-size:14px}
  .committee-name{font-size:20px}
}

/* ===== 富文档 / 知识库风格（.md-body / .kb-article） ===== */
.kb-article{max-width:760px;margin:0 auto}
.kb-article.md-body{font-size:1rem;line-height:1.78;color:var(--ink,#222);word-break:break-word}
.md-body h1{font-size:1.45rem;font-weight:800;line-height:1.3;margin:28px 0 6px;color:var(--pku-red,#C8112E)}
.md-body h2{font-size:1.2rem;font-weight:700;line-height:1.35;margin:30px 0 10px;padding-bottom:6px;border-bottom:2px solid var(--pku-red,#C8112E)}
.md-body h3{font-size:1.04rem;font-weight:700;margin:22px 0 8px;color:var(--pku-red,#C8112E)}
.md-body h4{font-size:1rem;font-weight:700;margin:18px 0 6px}
.md-body p{margin:10px 0}
.md-body ul,.md-body ol{margin:10px 0;padding-left:1.5em}
.md-body li{margin:5px 0}
.md-body li::marker{color:var(--pku-red,#C8112E)}
.md-body strong{color:var(--ink,#222);font-weight:700}
.md-body em{color:var(--gray,#555)}
.md-body a{color:var(--pku-red,#C8112E);text-decoration:none;border-bottom:1px solid rgba(200,17,46,.35)}
.md-body a:hover{border-bottom-color:var(--pku-red,#C8112E)}
.md-body code{background:#f3f3f3;padding:2px 6px;border-radius:5px;font-size:.86em;font-family:var(--font-mono,monospace)}
.md-body pre{background:#1f2430;color:#e6e6e6;padding:14px 16px;border-radius:10px;overflow-x:auto;font-size:.85rem;line-height:1.5;margin:12px 0}
.md-body pre code{background:none;padding:0;color:inherit}
.md-body blockquote{margin:14px 0;padding:11px 16px;border-left:4px solid var(--pku-red,#C8112E);background:#fcfcfc;border-radius:0 8px 8px 0;color:var(--gray,#555)}
.md-body blockquote p{margin:3px 0}
.md-body blockquote p:first-child{margin-top:0}
.md-body blockquote p:last-child{margin-bottom:0}
/* 表格：课程作业表风格 */
.md-body table{border-collapse:collapse;width:100%;margin:14px 0;font-size:.92rem;overflow:hidden;border-radius:8px;border:1px solid var(--line,#e3e3e3)}
.md-body th,.md-body td{border:1px solid var(--line,#e3e3e3);padding:9px 12px;text-align:left;vertical-align:top}
.md-body thead th{background:var(--paper-2,#fafafa);font-weight:700;color:var(--ink,#222);border-bottom:2px solid var(--pku-red,#C8112E)}
.md-body tbody tr:nth-child(even){background:#fcfcfc}
.md-body tbody tr:hover{background:rgba(200,17,46,.04)}
/* 图片 figure + 图注 */
.md-body img{max-width:100%;height:auto;border-radius:8px;display:block;margin:12px auto}
.md-figure{margin:16px 0;text-align:center}
.md-figure img{margin:0 auto;border:1px solid var(--line,#e3e3e3);box-shadow:var(--shadow)}
.md-figure figcaption{margin-top:8px;font-size:.82rem;color:var(--gray,#8a8a8a);line-height:1.5}
/* 信息卡 / 提示框（GitHub alert 风格） */
.md-alert{margin:16px 0;padding:12px 16px;border-radius:10px;border:1px solid var(--line,#e3e3e3);border-left-width:4px;background:var(--paper-2,#fafafa)}
.md-alert-head{display:flex;align-items:center;gap:8px;font-weight:700;margin-bottom:6px;font-size:.96rem}
.md-alert-ico{font-size:1.05rem;line-height:1}
.md-alert-body>*:first-child{margin-top:0}
.md-alert-body>*:last-child{margin-bottom:0}
.md-alert-note{border-left-color:#2563EB;background:#EBF2FE}
.md-alert-note .md-alert-head{color:#2563EB}
.md-alert-tip{border-left-color:#2D6A4F;background:#EAF5EF}
.md-alert-tip .md-alert-head{color:#2D6A4F}
.md-alert-important{border-left-color:#8B5CF6;background:#F3EEFD}
.md-alert-important .md-alert-head{color:#8B5CF6}
.md-alert-warning,.md-alert-caution{border-left-color:#D4770B;background:#FFF5E6}
.md-alert-warning .md-alert-head,.md-alert-caution .md-alert-head{color:#D4770B}
.md-alert-urgent{border-left-color:#C0392B;background:#FDEDEB}
.md-alert-urgent .md-alert-head{color:#C0392B}
/* 课程总览：管理员编辑入口 + 编辑框 + «最后更新» */
.ov-edit-bar{display:flex;justify-content:flex-end;margin-bottom:6px}
.ov-edited{margin:18px auto 0;max-width:760px;font-size:.8rem;color:var(--gray,#8a8a8a);text-align:right}
.ov-editor .md-editor{width:100%;min-height:340px;font-family:var(--font-mono,monospace,Consolas,Menlo,monospace);font-size:13px;line-height:1.6;color:var(--ink,#222);padding:12px;border:1px solid var(--line,#e3e3e3);border-radius:10px;resize:vertical}
.ov-editor .md-editor:focus{outline:none;border-color:var(--pku-red,#C8112E)}
.ov-hint{margin:10px 0 0;font-size:.82rem;color:var(--gray,#8a8a8a);line-height:1.5}
.ov-hint code{background:#f3f3f3;padding:1px 5px;border-radius:4px}

/* ---------- 课程总览：目录 + 章节层级 ---------- */
.ov-layout{display:grid;grid-template-columns:minmax(0,1fr)}
.ov-layout.has-toc{grid-template-columns:minmax(0,1fr) 214px;gap:30px;align-items:start}
.ov-main{min-width:0}
.ov-main .kb-article{max-width:920px}
/* 无目录的长文（多数笔记）保持原本的阅读宽度 */
.ov-layout:not(.has-toc) .ov-main .kb-article{max-width:760px}
.ov-edited{max-width:920px;text-align:right}
.ov-doc.md-body{counter-reset:ovh2;font-size:15.5px;line-height:1.75}
.ov-doc.md-body h1{scroll-margin-top:110px}
.ov-doc.md-body h2{
  counter-increment:ovh2;
  font-family:var(--serif);font-size:19px;font-weight:700;color:var(--ink);
  margin:38px 0 14px;padding:8px 0 8px 14px;
  border:0;border-left:4px solid var(--pku-red);
  background:linear-gradient(90deg,rgba(200,17,46,.06),rgba(200,17,46,0));
  border-radius:0 8px 8px 0;scroll-margin-top:110px;
}
.ov-doc.md-body h2::before{
  content:counter(ovh2,decimal-leading-zero);
  font-family:var(--mono);font-size:13px;font-weight:500;color:var(--pku-gold);
  margin-right:10px;letter-spacing:.05em;vertical-align:2px;
}
.ov-doc.md-body h3{
  font-size:15.5px;font-weight:600;color:var(--ink);
  margin:24px 0 10px;padding-left:11px;border-left:2px solid var(--line-strong);
  scroll-margin-top:110px;
}
.ov-doc.md-body table{font-size:14px;margin:16px 0}
.ov-doc.md-body thead th{background:var(--paper-3);letter-spacing:.02em}
.ov-doc.md-body tbody td:first-child{font-weight:600;color:var(--ink)}

/* 右侧目录 */
.ov-toc{position:sticky;top:92px;padding:14px 12px;border:1px solid var(--line);border-radius:12px;background:var(--paper-2);box-shadow:var(--shadow)}
.ov-toc-hd{display:flex;align-items:center;justify-content:space-between;font-size:11.5px;letter-spacing:.1em;color:var(--gray);margin-bottom:8px;padding:0 4px}
.ov-toc-hd #ovPct{font-variant-numeric:tabular-nums;color:var(--pku-red);font-weight:600;letter-spacing:0}
.ov-toc-bar{height:2px;background:var(--line);border-radius:2px;overflow:hidden;margin:0 4px 10px}
.ov-toc-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--pku-red),var(--pku-gold));transition:width .12s linear}
.ov-toc ul{list-style:none;max-height:calc(100vh - 230px);overflow-y:auto}
.ov-toc li{margin:0}
.ov-toc a{display:block;padding:6px 8px;border-radius:6px;font-size:13px;line-height:1.45;color:var(--ink-soft);border-left:2px solid transparent;transition:background var(--dur-1),color var(--dur-1)}
.ov-toc a:hover{background:var(--gray-bg);color:var(--ink);text-decoration:none}
.ov-toc li.sub a{padding-left:20px;font-size:12.5px;color:var(--gray)}
.ov-toc a.on{color:var(--pku-red);background:var(--red-bg);border-left-color:var(--pku-red);font-weight:600}

/* 回到顶部 */
.ov-top{position:fixed;right:20px;bottom:24px;width:40px;height:40px;padding:0;border-radius:50%;border:1px solid var(--line);background:var(--paper-2);color:var(--ink-soft);box-shadow:var(--shadow-lg);display:none;align-items:center;justify-content:center;z-index:80}
.ov-top .ico{width:18px;height:18px;transform:rotate(180deg)}
.ov-top.show{display:flex}
.ov-top:hover{color:var(--pku-red);border-color:rgba(200,17,46,.35)}
@media(max-width:1120px){
  .ov-layout.has-toc{grid-template-columns:minmax(0,1fr)}
  .ov-toc{display:none}
  .ov-main .kb-article,.ov-edited{max-width:100%}
  .ov-doc.md-body h2{font-size:17px;margin:30px 0 12px}
  .ov-doc.md-body h3{font-size:15px}
}

/* ===== 笔记库 ===== */
.tag-chips{display:flex;flex-wrap:wrap;gap:7px;align-items:center}
.tag-chip{display:inline-flex;align-items:center;gap:5px;padding:5px 11px;border-radius:999px;font-size:12.5px;border:1px solid var(--line-strong);background:#fff;color:var(--ink-soft);cursor:pointer;user-select:none;font-family:inherit;transition:border-color .15s,color .15s,background .15s}
.tag-chip:hover{border-color:var(--pku-red);color:var(--pku-red)}
.tag-chip.active{background:var(--pku-red);border-color:var(--pku-red);color:#fff}
.tag-opt{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:8px;font-size:12.5px;border:1px solid var(--line-strong,#cfcfcf);background:var(--paper,#fff);color:var(--ink,#222);cursor:pointer}
.tag-opt input{margin:0;accent-color:var(--pku-red,#C8112E)}
.note-card .note-head h3{margin:0 0 8px;font-size:16px;line-height:1.4}
.note-card .note-head h3 a{color:var(--ink,#222)}
.note-card .note-head h3 a:hover{color:var(--pku-red,#C8112E)}
.note-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;color:var(--gray,#8a8a8a);font-size:12.5px;margin-bottom:6px}
.note-meta .nc-course{font-weight:600;color:var(--pku-red,#C8112E)}
.note-meta .nc-seq{background:var(--paper-2,#f2f2f2);border-radius:6px;padding:1px 7px;color:var(--ink,#333)}
.note-meta .nc-contrib{background:#eef4ff;border-radius:6px;padding:1px 7px;color:#2b5cb0}
.note-preview{max-height:240px;overflow:hidden;position:relative;margin-top:4px}
.note-preview::after{content:"";position:absolute;left:0;right:0;bottom:0;height:52px;background:linear-gradient(transparent, var(--paper-2,#fafafa))}
.note-more{display:inline-block;margin-top:6px;color:var(--pku-red,#C8112E);font-size:13px;font-weight:600}
.note-more:hover{text-decoration:underline}
.note-detail-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;flex-wrap:wrap}
.note-detail-head h2{margin:0 0 8px}
/* 编辑页：左编辑右实时预览 */
.note-edit{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}
.ne-left{display:flex;flex-direction:column;gap:14px}
.ne-right{position:sticky;top:14px;background:var(--paper-2,#fafafa);border:1px solid var(--line,#e3e3e3);border-radius:var(--radius,12px);padding:18px;max-height:calc(100vh - 40px);overflow:auto}
.ne-prev-head{font-weight:600;margin-bottom:12px;color:var(--ink-soft,#555);font-size:13px}

@media(max-width:780px){
  /* 知识库富文档移动端：让表格随视口收缩并自动换行，避免 520px 最小宽度把页面撑出横向滚动 */
  .kb-article{padding:1px 0}
  .md-body{font-size:.96rem;line-height:1.7;overflow-wrap:break-word}
  .md-body table{min-width:0}
  .md-body th,.md-body td{padding:7px 8px;font-size:.82rem}
  .md-body ul,.md-body ol{padding-left:1.2em}
  .md-alert{padding:10px 12px}
  .md-alert-head{font-size:.92rem}
  .md-alert-body{font-size:.94rem}
  .md-figure{margin:14px 0}
  .md-body h1{font-size:1.32rem}
  .md-body h2{font-size:1.1rem}
  .md-body h3{font-size:1rem}
  .md-body pre{font-size:.8rem}
  .note-edit{grid-template-columns:1fr}
  .ne-right{position:relative;top:0;max-height:none;margin-top:6px}
  .note-preview{max-height:200px}
}

/* ===== 笔记图片：编辑器插入栏 ===== */
.ne-img-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.ne-img-hint{color:var(--gray,#8a8a8a);font-size:12.5px}
/* 笔记图片灯箱（详情页点击放大） */
.note-lb-mask{position:fixed;inset:0;z-index:9999;background:rgba(0,0,0,.86);display:flex;align-items:center;justify-content:center;cursor:zoom-out}
.note-lb-img{max-width:92vw;max-height:92vh;object-fit:contain;border-radius:6px;box-shadow:0 10px 40px rgba(0,0,0,.5)}
.note-lb-x{position:absolute;top:14px;right:18px;color:#fff;font-size:30px;line-height:1;cursor:pointer;opacity:.85}
.note-lb-x:hover{opacity:1}
/* 列表预览里的图片限高，避免卡片被撑爆 */
.note-preview .md-figure{margin:8px 0}
.note-preview .md-figure img{max-height:160px;object-fit:cover;width:auto}

/* ---------- 笔记库：卡片 v2（课程徽标 / 标题 / 摘要 / 页脚） ---------- */
.note-grid{display:grid;grid-template-columns:1fr;gap:16px}
.note-card{padding:16px 18px;display:flex;flex-direction:column}
.nc-top{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:10px;min-width:0}
.nc-top .feed-ops{margin-top:0}
.note-card .nc-course{font-size:12px;font-weight:600;color:var(--pku-red,#C8112E);background:var(--red-bg,#FBE9EC);border-radius:6px;padding:2px 8px}
.note-card .nc-seq{font-size:12px;color:var(--ink-soft,#555);background:var(--gray-bg,#F1EFE8);border-radius:6px;padding:2px 8px}
.note-card .nc-contrib{font-size:12px;color:#2b5cb0;background:#eef4ff;border-radius:6px;padding:2px 8px}
.nc-pin{display:inline-flex;align-items:center;gap:4px;font-size:12px;color:#8a6100;background:#fdf3d6;border-radius:6px;padding:2px 8px}
.nc-pin .ico{width:12px;height:12px}
.nc-spacer{flex:1 1 auto}
.nc-title{font-family:var(--serif);font-size:17px;font-weight:600;line-height:1.45;margin:0 0 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;word-break:break-word}
.nc-title a{color:var(--ink,#222)}
.nc-title a:hover{color:var(--pku-red,#C8112E);text-decoration:none}
.note-card .note-preview{margin:2px 0 0;font-size:14.5px;line-height:1.7;max-height:186px}
.nc-foot{display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px;margin-top:12px;padding-top:11px;border-top:1px dashed var(--line,#EAE6DE);font-size:12px;color:var(--gray,#8A93A6);min-width:0}
.nc-who{color:var(--ink-soft,#55514b);font-weight:600;font-size:12.5px;max-width:140px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nc-tags{display:flex;flex-wrap:wrap;gap:6px;min-width:0}
.nc-tags .tag{margin-right:0}
.nc-go{margin-left:auto;color:var(--pku-red,#C8112E);font-weight:600;font-size:13px;white-space:nowrap}
.nc-go:hover{text-decoration:underline}

/* ---------- 笔记详情：面包屑 + 标题块 ---------- */
.note-detail-top{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;flex-wrap:wrap;margin-bottom:18px;padding-bottom:16px;border-bottom:1px solid var(--line,#EAE6DE)}
.note-detail-main{flex:1;min-width:0}
.note-crumb{display:inline-flex;align-items:center;gap:5px;font-size:13px;color:var(--gray,#8A93A6);margin-bottom:8px}
.note-crumb .ico{width:14px;height:14px}
.note-crumb:hover{color:var(--pku-red,#C8112E);text-decoration:none}
.note-detail-top h1{font-family:var(--serif);font-size:24px;font-weight:700;line-height:1.35;margin:0 0 8px;color:var(--ink,#14161B);word-break:break-word}
.note-detail-top .note-meta{margin-bottom:0;font-size:13px;gap:8px 10px}
.note-back{margin-top:28px;text-align:center}

/* 课程资料页：关联笔记区块 */
.rel-notes{margin:22px 0 6px;padding:16px;border:1px dashed var(--line-strong,#d8d8d8);border-radius:12px;background:var(--paper,#fff)}
.rel-notes-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;font-weight:600;margin-bottom:12px;color:var(--ink,#222)}
.rel-notes-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.rel-note-card{display:block;border:1px solid var(--line,#e6e6e6);border-radius:10px;padding:12px 14px;background:var(--paper-2,#fafafa);text-decoration:none;color:inherit;transition:border-color .15s,box-shadow .15s}
.rel-note-card:hover{border-color:var(--pku-red,#C8112E);box-shadow:0 4px 14px rgba(200,17,46,.12)}
.rel-note-title{font-weight:600;margin-bottom:8px;color:var(--ink,#222);line-height:1.4}
.rel-note-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;color:var(--gray,#8a8a8a);font-size:12px}

/* ============ 二期 M2：交互底座 ============ */
/* 统一焦点环：键盘可见、鼠标不干扰 */
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{
  outline:2px solid var(--pku-red,#C8112E);outline-offset:2px;border-radius:4px;
}
body.modal-open{overflow:hidden}

/* Toast v2：堆叠 + 类型色 + 撤销动作 */
.toast-box{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:200;display:flex;flex-direction:column;gap:10px;align-items:center;pointer-events:none;width:max-content;max-width:92vw}
.toast-item{
  pointer-events:auto;display:flex;align-items:center;gap:10px;
  min-width:220px;max-width:92vw;padding:11px 14px;border-radius:12px;
  background:var(--ink,#222);color:#fff;font-size:14px;line-height:1.45;
  box-shadow:0 10px 34px rgba(30,20,15,.22);
  opacity:0;transform:translateY(10px) scale(.985);
  transition:opacity .2s var(--ease-out,#cubic),transform .2s var(--ease-out,ease);
}
.toast-item.show{opacity:1;transform:translateY(0) scale(1)}
.toast-item .ti-ico{display:flex;align-items:center;justify-content:center;width:18px;height:18px;flex-shrink:0}
.toast-item .ti-ico svg{width:18px;height:18px;display:block}
.toast-item .ti-msg{flex:1;min-width:0;word-break:break-word}
.toast-item .ti-act{
  flex-shrink:0;background:transparent;border:1px solid rgba(255,255,255,.5);color:#fff;
  padding:4px 10px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;
}
.toast-item .ti-act:hover{background:rgba(255,255,255,.16)}
.toast-item .ti-x{
  flex-shrink:0;background:transparent;border:0;color:rgba(255,255,255,.6);cursor:pointer;
  font-size:13px;line-height:1;padding:3px 4px;border-radius:6px;
}
.toast-item .ti-x:hover{color:#fff;background:rgba(255,255,255,.14)}
.toast-item.t-success{background:#1f7a45}
.toast-item.t-error{background:#a3122a}
.toast-item.t-warn{background:#8a5a0b}
.toast-item.t-info{background:var(--ink,#222)}

/* 确认对话框 */
.confirm-body{padding-top:2px}
.confirm-msg{margin:0 0 20px;font-size:15px;line-height:1.65;color:var(--ink-soft,#555)}

/* 软删除：先折叠移除，5s 内可撤销 */
.is-removing{
  overflow:hidden;pointer-events:none;
  animation:rowOut .26s var(--ease-out,ease) forwards;
}
@keyframes rowOut{
  60%{opacity:0;transform:translateX(-10px)}
  to{opacity:0;transform:translateX(-10px);height:0;min-height:0;padding-top:0;padding-bottom:0;margin-top:0;margin-bottom:0;border-top-width:0;border-bottom-width:0}
}

/* 按钮忙碌态 */
.btn.is-busy{position:relative;pointer-events:none;opacity:.75}
.btn.is-busy::after{
  content:"";position:absolute;top:50%;left:50%;width:14px;height:14px;margin:-7px 0 0 -7px;
  border:2px solid rgba(255,255,255,.45);border-top-color:#fff;border-radius:50%;
  animation:mlspin .7s linear infinite;
}
.btn.ghost.is-busy::after{border-color:rgba(200,17,46,.35);border-top-color:var(--pku-red,#C8112E)}
@keyframes mlspin{to{transform:rotate(360deg)}}

/* ---------- 首页 Hero：问候 + 下一节课 + 本周进度 ---------- */
.hero{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:16px;margin-bottom:18px}
.hero-main{
  position:relative;overflow:hidden;
  background:linear-gradient(135deg,var(--paper-2) 0%,#fffdf7 55%,#fbf6ec 100%);
  border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:22px 24px;box-shadow:var(--shadow);
}
/* 科技感底纹：极淡的双向栅格，只出现在右上角 */
.hero-main::after{
  content:'';position:absolute;right:-46px;top:-46px;width:230px;height:230px;pointer-events:none;
  background:
    repeating-linear-gradient(0deg,rgba(200,17,46,.07) 0 1px,transparent 1px 22px),
    repeating-linear-gradient(90deg,rgba(200,17,46,.07) 0 1px,transparent 1px 22px);
  -webkit-mask-image:radial-gradient(circle at 100% 0%,#000 10%,transparent 72%);
  mask-image:radial-gradient(circle at 100% 0%,#000 10%,transparent 72%);
}
.hero-main > *{position:relative;z-index:1}
.hero-greet{font-family:var(--serif);font-size:20px;font-weight:600;color:var(--ink);margin-bottom:14px;letter-spacing:.01em}
.hn-label{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--gray);letter-spacing:.05em}
.hn-title{font-family:var(--serif);font-size:22px;font-weight:700;color:var(--ink);margin:6px 0 8px;line-height:1.25}
.hn-title.muted{color:var(--gray);font-size:17px;font-weight:500}
.hn-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:13px;color:var(--ink-soft)}
.hn-time{font-variant-numeric:tabular-nums;font-weight:600;color:var(--ink)}
.hn-ops{display:flex;gap:8px;margin-top:12px}
.hero-prog{margin-top:18px;padding-top:14px;border-top:1px dashed var(--line)}
.hp-head{display:flex;align-items:baseline;justify-content:space-between;font-size:13px;color:var(--ink-soft)}
.hp-num{font-family:var(--serif);font-size:16px;font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums}
.hp-bar{height:6px;border-radius:99px;background:var(--gray-bg);overflow:hidden;margin:8px 0 6px}
.hp-bar i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--pku-red),#e0576b);transition:width .5s var(--ease-out)}
.hp-foot{font-size:11.5px;color:var(--gray);font-variant-numeric:tabular-nums}
.hero-side{display:flex;flex-direction:column;gap:12px;min-width:0}
.hero-side .stat-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:0}
.hero-side .stat{padding:12px 8px;border:1px solid var(--line);border-radius:12px;background:var(--paper-2);text-align:center;box-shadow:none}
.hero-side .stat .num{font-size:22px}
.hero-side .stat .lbl{font-size:11.5px;margin-top:5px}
.quick-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.quick{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;min-width:0;min-height:70px;
  border:1px solid var(--line);border-radius:12px;background:var(--paper-2);
  color:var(--ink);font-size:12px;text-decoration:none;text-align:center;
  transition:border-color var(--dur-1) var(--ease-out),background var(--dur-1) var(--ease-out),transform var(--dur-1) var(--ease-out);
}
.quick:hover{border-color:var(--pku-red);background:#fff;transform:translateY(-1px);text-decoration:none}
.quick .ico{color:var(--pku-red);width:20px;height:20px}
.quick span{white-space:normal;line-height:1.25;font-size:12px;word-break:keep-all}
@media(max-width:900px){
  .hero{grid-template-columns:1fr}
  .hero-side .stat-grid{grid-template-columns:repeat(5,minmax(0,1fr))}
}

/* ---------- Bento 模块网格：替代同质化白卡堆叠 ---------- */
.bento{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;align-items:start}
.bento-item{
  background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:18px 20px;min-width:0;
}
.bento-item h3{font-family:var(--serif);font-size:17px;color:var(--ink);margin-bottom:14px;display:flex;align-items:center;gap:8px}
.bento-item h3 .bar{width:4px;height:18px;background:var(--pku-red);border-radius:2px;display:inline-block}
.bento-item.w2{grid-column:span 2}
@media(max-width:900px){
  .bento{grid-template-columns:1fr}
  .bento-item.w2{grid-column:span 1}
}