/* ============================================================
   北京校友看板 · 样式（浅色主题）
   ============================================================ */
:root{
  --bg:#f4f6fa;
  --bg-grad:radial-gradient(1200px 600px at 12% -8%, #e6f1ff 0%, rgba(244,246,250,0) 62%),
            radial-gradient(900px 500px at 92% 0%, #e6f7f4 0%, rgba(244,246,250,0) 58%);
  --card:#ffffff;
  --line:#e8ecf3;
  --line-strong:#dbe2ee;
  --text:#141a26;
  --text-2:#4b5768;
  --text-3:#8a94a6;
  --accent:#207ce0;
  --accent-soft:#eef6ff;
  --shadow:0 1px 2px rgba(20,26,38,.04), 0 6px 20px -8px rgba(20,26,38,.14);
  --shadow-lg:0 2px 6px rgba(20,26,38,.06), 0 22px 48px -18px rgba(20,26,38,.22);
  --radius:16px;
  --radius-sm:11px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",
              -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  background:var(--bg); background-image:var(--bg-grad); color:var(--text);
  font-size:14px; line-height:1.6; -webkit-font-smoothing:antialiased;
}
.hidden{display:none !important}
::selection{background:#cce5ff}
.login-logo img,.brand-logo img{display:block;width:auto;object-fit:contain;filter:drop-shadow(0 1px 1px rgba(0,0,0,.06))}

/* ---------------- 登录页 ---------------- */
.login-page{
  min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;
  background:var(--bg);background-image:var(--bg-grad);
}
.login-card{
  width:100%;max-width:400px;background:var(--card);border:1px solid var(--line);
  border-radius:22px;padding:38px 34px 26px;box-shadow:var(--shadow-lg);
  animation:rise .5s cubic-bezier(.2,.7,.3,1);
}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.login-brand{text-align:center;margin-bottom:26px}
.login-logo{
  display:inline-flex;align-items:center;justify-content:center;margin:0 auto 18px;
  padding:13px 20px;border-radius:16px;
  background:linear-gradient(140deg,#4b96ff,#207ce0 55%,#0f66c6);
  box-shadow:0 12px 28px -12px rgba(32,124,224,.85);
}
.login-logo img{height:38px}
.login-brand h1{font-size:19px;font-weight:650;letter-spacing:.2px}
.login-brand p{font-size:12.5px;color:var(--text-3);margin-top:7px}
.field{display:block;margin-bottom:14px}
.field-label{display:block;font-size:12.5px;color:var(--text-2);margin-bottom:7px;font-weight:500}
.field input{
  width:100%;height:46px;padding:0 15px;border:1px solid var(--line-strong);border-radius:var(--radius-sm);
  font-size:14.5px;background:#fbfcfe;color:var(--text);transition:.18s;font-family:inherit;
}
.field input:focus{outline:none;border-color:var(--accent);background:#fff;box-shadow:0 0 0 3.5px rgba(32,124,224,.13)}
.login-msg{min-height:20px;font-size:12.5px;color:#e5484d;margin:2px 2px 10px}
.btn-primary{
  width:100%;height:46px;border:none;border-radius:var(--radius-sm);cursor:pointer;
  background:linear-gradient(140deg,#4b96ff,#207ce0 55%,#0f66c6);color:#fff;font-size:14.5px;font-weight:600;
  font-family:inherit;display:flex;align-items:center;justify-content:center;gap:9px;
  transition:.18s;box-shadow:0 10px 22px -12px rgba(32,124,224,.95);
}
.btn-primary:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn-primary:active{transform:none}
.btn-primary:disabled{opacity:.65;cursor:not-allowed;transform:none}
.spinner{
  width:15px;height:15px;border-radius:50%;border:2px solid rgba(255,255,255,.35);
  border-top-color:#fff;animation:spin .7s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}
.login-foot{margin-top:20px;text-align:center;font-size:11.5px;color:var(--text-3)}

/* ---------------- 看板骨架 ---------------- */
.app{min-height:100vh;display:flex;flex-direction:column}
.topbar{
  position:sticky;top:0;z-index:40;background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line);
}
.topbar-inner{
  max-width:1320px;margin:0 auto;padding:12px 26px;display:flex;align-items:center;
  justify-content:space-between;gap:16px;
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-logo{
  flex:none;display:inline-flex;align-items:center;justify-content:center;
  height:40px;padding:0 13px;border-radius:11px;
  background:linear-gradient(140deg,#4b96ff,#207ce0 55%,#0f66c6);
  box-shadow:0 8px 18px -9px rgba(32,124,224,.9);
}
.brand-logo img{height:25px}
.brand-text{min-width:0}
.brand-text strong{display:block;font-size:15.5px;font-weight:650;letter-spacing:.2px;white-space:nowrap}
.brand-text span{display:block;font-size:11.5px;color:var(--text-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar-actions{display:flex;align-items:center;gap:9px;flex:none}
.meta-time{font-size:11.5px;color:var(--text-3);margin-right:4px}
.btn-ghost{
  height:32px;padding:0 13px;border-radius:9px;border:1px solid var(--line-strong);background:#fff;
  color:var(--text-2);font-size:12.5px;cursor:pointer;transition:.16s;font-family:inherit;
}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}

/* ---------------- 标签导航 ---------------- */
.tabs{
  position:sticky;top:65px;z-index:35;background:rgba(244,246,250,.9);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line);
}
.tabs-inner{max-width:1320px;margin:0 auto;padding:9px 26px;display:flex;gap:7px;overflow-x:auto;scrollbar-width:none}
.tabs-inner::-webkit-scrollbar{display:none}
.tab{
  flex:none;height:31px;padding:0 14px;border-radius:999px;border:1px solid transparent;background:transparent;
  color:var(--text-2);font-size:12.5px;cursor:pointer;transition:.16s;white-space:nowrap;font-family:inherit;
}
.tab:hover{background:#fff;border-color:var(--line-strong);color:var(--text)}
.tab.active{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600;
  box-shadow:0 6px 16px -8px rgba(32,124,224,.95)}

/* ---------------- 主体 ---------------- */
.main{max-width:1320px;margin:0 auto;padding:22px 26px 60px;width:100%}

/* KPI */
.kpi-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(168px,1fr));gap:12px;margin-bottom:18px}
.kpi{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:15px 16px;
  box-shadow:var(--shadow);position:relative;overflow:hidden;transition:.2s;
}
.kpi::after{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:linear-gradient(180deg,var(--accent),#4b96ff);opacity:.95}
.kpi:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.kpi-label{font-size:11.5px;color:var(--text-3);letter-spacing:.3px}
.kpi-value{font-size:26px;font-weight:700;letter-spacing:-.6px;margin:5px 0 3px;font-variant-numeric:tabular-nums}
.kpi-value small{font-size:12.5px;font-weight:500;color:var(--text-2);margin-left:3px;letter-spacing:0}
.kpi-hint{font-size:11px;color:var(--text-3);line-height:1.45}

/* 洞察 */
.insight-panel{
  background:linear-gradient(150deg,#f3f9ff,#eaf4ff);border:1px solid #c9e0ff;border-radius:var(--radius);
  padding:17px 20px;margin-bottom:22px;
}
.insight-panel h3{font-size:13px;font-weight:650;color:#0f66c6;margin-bottom:10px;display:flex;align-items:center;gap:7px}
.insight-list{list-style:none;display:grid;gap:7px}
.insight-list li{font-size:13px;color:var(--text-2);line-height:1.65;padding-left:2px}
.insight-list li strong{color:var(--text);font-weight:650}

/* 板块 */
.section{margin-bottom:30px;scroll-margin-top:116px}
.section-head{display:flex;align-items:baseline;gap:11px;margin-bottom:13px;flex-wrap:wrap}
.section-head h2{font-size:17px;font-weight:680;letter-spacing:.2px;display:flex;align-items:center;gap:9px}
.section-head .ico{font-size:17px}
.section-head p{font-size:12.5px;color:var(--text-3)}
.chart-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:14px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px 13px;
  box-shadow:var(--shadow);transition:.2s;overflow:hidden;display:flex;flex-direction:column;
}
.card:hover{box-shadow:var(--shadow-lg)}
.card-title{font-size:13.5px;font-weight:640;letter-spacing:.15px;display:flex;align-items:baseline;
  justify-content:space-between;gap:10px;flex-wrap:wrap}
.card-meta{font-size:11px;color:var(--text-3);font-weight:400;letter-spacing:0;white-space:nowrap}
.card-meta b{color:var(--text-2);font-weight:600;font-variant-numeric:tabular-nums}
.card-note{font-size:11.5px;color:var(--text-3);line-height:1.55;margin-top:9px;padding-top:9px;
  border-top:1px dashed var(--line-strong)}
.chart{width:100%;margin-top:6px}
.w4{grid-column:span 4}.w6{grid-column:span 6}.w8{grid-column:span 8}.w12{grid-column:span 12}
@media(max-width:1100px){.w4,.w6,.w8{grid-column:span 6}}
@media(max-width:760px){
  .w4,.w6,.w8,.w12{grid-column:span 12}
  .topbar-inner,.tabs-inner,.main{padding-left:15px;padding-right:15px}
  .brand-logo{height:36px;padding:0 11px}
  .brand-logo img{height:22px}
  .login-logo{padding:11px 16px}
  .login-logo img{height:32px}
  .brand-text span{display:none}
  .meta-time{display:none}
  .tabs{top:61px}
}

/* 表格 */
.tbl-wrap{overflow:auto;max-height:420px;margin-top:8px;border:1px solid var(--line);border-radius:10px}
table.tbl{width:100%;border-collapse:collapse;font-size:12.5px}
table.tbl th{
  position:sticky;top:0;background:#f7f9fc;color:var(--text-2);font-weight:600;text-align:left;
  padding:9px 12px;border-bottom:1px solid var(--line-strong);white-space:nowrap;z-index:1;font-size:12px;
}
table.tbl td{padding:8px 12px;border-bottom:1px solid #f1f4f9;color:var(--text-2);font-variant-numeric:tabular-nums}
table.tbl tr:last-child td{border-bottom:none}
table.tbl tr:hover td{background:#f5faff}
table.tbl td:first-child{color:var(--text);font-weight:500}
.bar-cell{position:relative}
.bar-cell span{position:relative;z-index:1}

/* 加载 / 错误 */
.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;gap:14px;color:var(--text-3)}
.loading .ring{width:34px;height:34px;border-radius:50%;border:3px solid #e3e9f2;border-top-color:var(--accent);animation:spin .8s linear infinite}
.skel{background:linear-gradient(100deg,#eef2f8 30%,#f7f9fc 50%,#eef2f8 70%);background-size:220% 100%;
  animation:shim 1.3s infinite;border-radius:var(--radius)}
@keyframes shim{to{background-position:-120% 0}}
.foot{text-align:center;font-size:11.5px;color:var(--text-3);padding:10px 0 0;line-height:1.8}

@media print{
  .topbar-actions,.tabs{display:none}
  .card,.kpi{break-inside:avoid;box-shadow:none}
  body{background:#fff}
}