/* EduSaaS 后台通用样式 · 原生 CSS，无框架依赖 */
:root{
  --primary:#3563e9; --primary-dark:#2551cc; --primary-soft:#eef3ff;
  --bg:#f4f6fb; --surface:#ffffff; --line:#e6e9f1; --text:#1f2733;
  --muted:#7b8496; --ok:#0f9d58; --warn:#e8971a; --err:#dc3c45;
  --radius:10px; --shadow:0 2px 14px rgba(27,42,74,.055);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font:14px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--text);background:var(--bg)}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-dark)}
h1,h2,h3{margin:0;font-weight:650}
p{margin:0}

/* ---------- 后台布局 ---------- */
.layout{display:flex;min-height:100vh}
.sidebar{width:224px;flex:0 0 224px;background:#141b2d;color:#c7cfdd;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow-y:auto}
.brand{display:flex;align-items:center;gap:11px;padding:20px 20px 22px;color:#fff;border-bottom:1px solid rgba(255,255,255,.07)}
.brand:hover{color:#fff}
.brand-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,#4b7bff,#2b4fd0);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:17px;letter-spacing:-1px}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text b{font-size:15px;letter-spacing:.3px}
.brand-text small{font-size:11px;color:#8e99ae;margin-top:2px}
.nav{flex:1;padding:14px 10px}
.nav-group{padding:14px 12px 6px;font-size:11px;letter-spacing:1px;color:#6f7b92;text-transform:uppercase}
.nav-item{display:flex;align-items:center;gap:10px;padding:9px 12px;margin:2px 0;border-radius:7px;color:#b9c2d2;font-size:13.5px;transition:.15s}
.nav-item:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-item.active{background:var(--primary);color:#fff;box-shadow:0 4px 12px rgba(53,99,233,.32)}
.nav-icon{width:17px;text-align:center;font-size:14px;opacity:.9}
.sidebar-foot{padding:14px 18px;font-size:11px;color:#6f7b92;border-top:1px solid rgba(255,255,255,.07)}
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{height:60px;background:var(--surface);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}
.crumb{font-size:15px;font-weight:600;display:flex;align-items:center;gap:9px}
.dot{width:7px;height:7px;border-radius:50%;background:var(--primary);display:inline-block}
.topbar-right{display:flex;align-items:center;gap:14px;font-size:13px;color:var(--muted)}
.tenant-chip{background:var(--primary-soft);color:var(--primary);padding:4px 10px;border-radius:20px;font-size:12px;font-weight:600}
.logout{padding:5px 12px;border:1px solid var(--line);border-radius:6px;color:var(--muted)}
.logout:hover{border-color:var(--err);color:var(--err)}
.content{padding:22px 26px 34px;flex:1}
.foot{margin-top:28px;text-align:center;color:#9aa3b2;font-size:12px}

/* ---------- 卡片 / 提示 ---------- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:18px;overflow:hidden}
.card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:18px 20px;border-bottom:1px solid var(--line)}
.card-head h2{font-size:16px}
.muted{color:var(--muted);font-size:12.5px;margin-top:4px}
.alert{padding:11px 16px;border-radius:8px;margin-bottom:16px;font-size:13.5px}
.alert-ok{background:#eaf7ef;color:#0b7a43;border:1px solid #c7ebd6}
.alert-err{background:#fdeef0;color:#b32732;border:1px solid #f7ccd1}
.notice{background:#f5f8ff;border-left:3px solid var(--primary);padding:11px 14px;margin:16px 20px 0;font-size:13px;color:#42506b;border-radius:4px}
.help{color:var(--muted);font-size:12px;margin-top:5px}
.btn-group{display:flex;gap:8px;flex-wrap:wrap}

/* ---------- 按钮 / 徽章 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 15px;border:1px solid var(--line);background:#fff;color:#44506a;border-radius:7px;font-size:13px;cursor:pointer;transition:.15s;white-space:nowrap}
.btn:hover{border-color:var(--primary);color:var(--primary);background:#fbfcff}
.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn.primary:hover{background:var(--primary-dark);border-color:var(--primary-dark);color:#fff}
.btn.small{padding:5px 11px;font-size:12px}
.btn.block{width:100%;padding:11px;font-size:15px;margin-top:8px}
.btn.danger{border-color:#f3c8cc;color:var(--err)}
.btn.danger:hover{background:#fff5f6;border-color:var(--err)}
.link-btn{background:none;border:0;color:var(--primary);cursor:pointer;font-size:13px;padding:0 6px}
.link-btn:hover{text-decoration:underline}
.badge{display:inline-block;padding:2px 9px;border-radius:20px;font-size:11.5px;font-weight:600;line-height:1.7}
.badge-ok{background:#e7f6ec;color:#0b7a43}
.badge-warn{background:#fff3e0;color:#b06d05}
.badge-err{background:#fdecef;color:#bb2c37}
.badge-info{background:#eaf0ff;color:#2f56c6}
.badge-gray{background:#f0f2f6;color:#6b7488}
.inline{display:inline;margin:0}
.ta-r{text-align:right}
.ops{white-space:nowrap}

/* ---------- 表格 ---------- */
.table-wrap{overflow-x:auto}
.table{width:100%;border-collapse:collapse;font-size:13.5px}
.table th{background:#fafbfe;color:#69748a;font-weight:600;text-align:left;padding:11px 16px;border-bottom:1px solid var(--line);white-space:nowrap}
.table td{padding:11px 16px;border-bottom:1px solid #f0f2f7;vertical-align:middle}
.table tbody tr:hover{background:#fbfcff}
.table tbody tr:last-child td{border-bottom:0}
.table .empty{text-align:center;color:var(--muted);padding:42px 0}
.table strong{font-weight:600}
.sub{color:var(--muted);font-size:12px}
.pager{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;border-top:1px solid var(--line);color:var(--muted);font-size:12.5px}
.pager-links{display:flex;gap:8px}
.search{display:flex;gap:8px;padding:14px 20px;border-bottom:1px solid var(--line);background:#fcfdff}
.search input{flex:1}

/* ---------- 表单 ---------- */
.form-card{max-width:820px}
.field{margin-bottom:17px}
.field label{display:block;font-size:13px;font-weight:600;color:#414b60;margin-bottom:7px}
.field label em{color:var(--err);font-style:normal;margin-left:3px}
input[type=text],input[type=password],input[type=number],input[type=email],select,textarea{
  width:100%;padding:9px 12px;border:1px solid #dfe3ec;border-radius:7px;background:#fff;color:var(--text);
  font:14px/1.5 inherit;outline:none;transition:.15s
}
input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(53,99,233,.1)}
input[readonly]{background:#f7f8fb;color:#6b7488}
textarea{resize:vertical}
.form-actions{display:flex;gap:10px;padding-top:6px}
.form-divider{font-size:13px;font-weight:700;color:var(--primary);margin:22px 0 14px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.static-value{color:#4a5468;padding:7px 0}
.side-card{max-width:820px;padding:18px 20px}
.side-card h3{font-size:14px;margin-bottom:10px}
.mod-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:10px}
.mod-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;cursor:pointer;background:#fcfdff}
.mod-item:hover{border-color:var(--primary);background:#f7faff}
.mod-item input[type=checkbox]{width:16px;height:16px;flex:0 0 16px}
.mod-item .mod-name{flex:1;display:flex;flex-direction:column;line-height:1.4;min-width:0}
.mod-item .mod-name b{font-size:13px;font-weight:600}
.mod-item .mod-name small{color:var(--muted);font-size:11.5px}
.mod-item input[type=text]{width:62px;flex:0 0 62px;padding:5px 7px;text-align:center;font-size:12px}

/* ---------- 看板 ---------- */
.kpi-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin-bottom:18px}
.kpi{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.kpi .label{color:var(--muted);font-size:12.5px}
.kpi .value{font-size:27px;font-weight:700;letter-spacing:-.5px;margin-top:6px}
.kpi .hint{font-size:11.5px;color:#9aa3b2;margin-top:4px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.panel{padding:18px 20px}
.panel h3{font-size:14px;margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.info-list{display:grid;grid-template-columns:130px 1fr;gap:9px 14px;font-size:13.5px}
.info-list dt{color:var(--muted)}
.info-list dd{margin:0}
.quick{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}

/* ---------- 登录 ---------- */
.auth-body{background:#f4f6fb}
.auth-wrap{display:flex;min-height:100vh}
.auth-side{flex:1;background:linear-gradient(150deg,#1b2b52 0%,#24429b 55%,#3563e9 100%);color:#fff;display:flex;align-items:center;padding:56px;position:relative;overflow:hidden}
.auth-side:after{content:"";position:absolute;width:520px;height:520px;border-radius:50%;border:1px solid rgba(255,255,255,.09);right:-180px;top:-160px;box-shadow:0 0 0 90px rgba(255,255,255,.035),0 0 0 190px rgba(255,255,255,.025)}
.auth-side-inner{max-width:440px;position:relative;z-index:1}
.auth-logo{font-size:19px;font-weight:700;letter-spacing:.5px;display:flex;align-items:center;gap:10px}
.auth-logo span{width:34px;height:34px;border-radius:9px;background:rgba(255,255,255,.18);display:flex;align-items:center;justify-content:center}
.auth-side h2{font-size:34px;line-height:1.35;margin:48px 0 18px;font-weight:650}
.auth-side p{color:#c9d7ff;font-size:14px;line-height:1.9}
.auth-side ul{margin:30px 0 0;padding:0;list-style:none;color:#dce6ff;font-size:13.5px;line-height:2.3}
.auth-side li:before{content:"✓";margin-right:9px;color:#8fb6ff}
.auth-side-foot{position:absolute;bottom:34px;font-size:12px;color:#9fb4e8}
.auth-main{width:480px;flex:0 0 480px;display:flex;align-items:center;justify-content:center;padding:40px}
.auth-box{width:100%;max-width:340px}
.auth-box h1{font-size:24px}
.auth-sub{color:var(--muted);font-size:13px;margin:8px 0 26px}
.auth-box .field{margin-bottom:16px}
.auth-box input{padding:11px 13px}
.auth-foot{margin-top:20px;text-align:center;color:#9aa3b2;font-size:12px;line-height:1.9}
.auth-links{margin-top:14px;text-align:center;font-size:12.5px;display:flex;gap:16px;justify-content:center}

@media(max-width:960px){
  .auth-side{display:none}
  .auth-main{width:100%;flex:1}
  .grid-2{grid-template-columns:1fr}
  .sidebar{width:64px;flex:0 0 64px}
  .brand-text,.nav-group,.nav-item span:last-child,.sidebar-foot{display:none}
  .nav-item{justify-content:center}
  .topbar{padding:0 14px}
  .content{padding:16px}
}