/* ============================================================
   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{
  --pku-red:#C8112E;
  --pku-red-dark:#9e0d24;
  --pku-gold:#b8860b;
  --ink:#1c1b19;
  --ink-soft:#55514b;
  --paper:#f7f3ec;
  --paper-2:#fffdf8;
  --line:#e3ddd0;
  --line-strong:#cdc4b2;
  --green:#2e7d32;
  --green-bg:#e7f3e8;
  --gray:#8a847a;
  --gray-bg:#efece5;
  --red-bg:#fbeaed;
  --shadow:0 2px 10px rgba(40,30,20,.08);
  --shadow-lg:0 8px 30px rgba(40,30,20,.14);
  --radius:14px;
  --serif:"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --sans:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;
}
*{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 + 固定邮箱后缀（不可修改） */
.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)}
.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;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}
.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;max-width:1100px;width:100%}
/* ---------- 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}
}

/* ---------- 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}
.cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:8px}
.cal-cell{
  min-height:104px;border:1px solid var(--line);border-radius:10px;padding:7px;background:var(--paper-2);
  display:flex;flex-direction:column;gap:4px;
}
.cal-cell.other{background:var(--paper);opacity:.5}
.cal-cell .d{font-size:13px;color:var(--ink-soft);font-weight:600}
.cal-cell.today{box-shadow:inset 0 0 0 2px var(--pku-red)}
.evt{
  font-size:12px;padding:3px 6px;border-radius:6px;color:#fff;cursor:pointer;overflow:hidden;
  white-space:nowrap;text-overflow:ellipsis;
}
.evt:hover{filter:brightness(1.08)}
/* 课程块容器（桌面显示文字块，移动端切换为色点） */
.evt-list{display:flex;flex-direction:column;gap:4px;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（桌面隐藏） */
.cal-agenda{display:none}
.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}
.mat-item .mi-title{font-weight:700;font-size:15px;word-break:break-word;line-height:1.35;color:var(--ink)}
.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}
.mat-item .mi-thumb{display:inline-block;border:1px solid var(--line);border-radius:10px;overflow:hidden;max-width:220px;max-height:160px;background:#fff}
.mat-item .mi-thumb img{display:block;max-width:100%;max-height:160px;object-fit:cover}
.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 ---------- */
.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:10px}
.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}
.muted{color:var(--gray)}
.row-gap{display:flex;gap:10px;flex-wrap:wrap}
.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px;align-items:center}
.filter-bar select{padding:8px 11px;border:1px solid var(--line-strong);border-radius:9px;font-size:13.5px;background:#fff}
.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}
.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:10px;margin-bottom:12px;align-items:flex-start}
.asg-title-wrap{display:flex;align-items:center;gap:10px;flex-wrap:wrap;flex:1;min-width:0}
.asg-title{font-family:var(--serif);font-size:17px;font-weight:700;color:var(--ink);line-height:1.35;word-break:break-word}
.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}
.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}
.asg-section{margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}
.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}

/* ---------- 日历事件关联入口 ---------- */
.evt{display:flex;align-items:center;gap:4px}
.evt-link{flex:1;min-width:0;color:#fff;text-decoration:none;display:block;overflow:hidden}
.evt-link span{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:11px}
.evt-link:hover{text-decoration:underline}
.evt-mini{flex-shrink:0;width:18px;height:18px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:rgba(255,255,255,.22);color:#fff;font-size:11px;text-decoration:none}
.evt-mini:hover{background:rgba(255,255,255,.35)}
.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-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{display:block;margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}

  /* 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}
.feed-ops{display:flex;gap:6px;align-items:center;flex-shrink:0;margin-top:8px}
.event-card h3,.share-card h3{font-size:17px;font-weight:600;margin-bottom:6px}
.event-card h3 a,.share-card h3 a{color:var(--ink)}
.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}
.event-files,.share-files{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.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}
.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}

@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}
}