:root{--bg:#f4f6f8;--panel:#fff;--text:#17212b;--muted:#718096;--line:#e7ebef;--nav:#101c2c;--nav2:#17263a;--blue:#2869e8;--blueSoft:#eaf1ff;--green:#14885f;--greenSoft:#e8f7f1;--orange:#c56b12;--orangeSoft:#fff3e6;--red:#cc3a45;--redSoft:#ffedef;--shadow:0 8px 24px rgba(23,33,43,.08);font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-size:14px}.hidden{display:none!important}.app-shell{display:grid;grid-template-columns:224px 1fr;min-height:100vh}.sidebar{background:var(--nav);color:#d9e2ec;padding:22px 14px;position:fixed;width:224px;height:100vh;display:flex;flex-direction:column;z-index:20}.brand{display:flex;align-items:center;gap:11px;padding:0 10px 24px}.brand-mark{width:35px;height:35px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(145deg,#4f8cff,#1c5bdb);font-size:18px;font-weight:800;color:white}.brand strong,.brand span{display:block}.brand strong{font-size:17px;color:#fff}.brand span{font-size:11px;color:#8293a8;margin-top:2px;letter-spacing:1px}nav{display:flex;flex-direction:column;gap:4px}.nav-item{border:0;background:transparent;color:#9dacbd;text-align:left;padding:11px 12px;border-radius:8px;cursor:pointer;font-size:14px;display:flex;align-items:center;gap:12px}.nav-item:hover{background:var(--nav2);color:#fff}.nav-item.active{background:#253a55;color:white}.nav-item .ico{font-size:16px;width:18px;text-align:center}.sidebar-foot{margin-top:auto;border-top:1px solid #26364a;padding:17px 7px 0;display:flex;align-items:center;gap:9px}.sidebar-foot .avatar{width:33px;height:33px;background:#3e6fa8;border-radius:50%;display:grid;place-items:center;color:white}.sidebar-foot strong,.sidebar-foot span{display:block}.sidebar-foot strong{font-size:13px;color:white}.sidebar-foot span{font-size:11px;color:#8190a2;margin-top:2px}.sidebar-foot button{margin-left:auto;background:none;border:0;color:#8293a8;cursor:pointer}main{grid-column:2;min-width:0}.topbar{height:66px;background:white;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 28px;position:sticky;top:0;z-index:10}.global-search{position:relative;max-width:560px;flex:1;background:#f5f7f9;border:1px solid #edf0f2;border-radius:8px;display:flex;align-items:center;padding:0 12px}.global-search input{height:38px;background:transparent;border:0;outline:0;flex:1;padding:0 9px;color:var(--text)}kbd{font:11px inherit;color:#8b97a4;border:1px solid #dce1e6;border-radius:4px;padding:2px 6px;background:white}.search-results{position:absolute;top:44px;left:0;right:0;background:white;border:1px solid var(--line);border-radius:9px;box-shadow:var(--shadow);padding:8px;z-index:30}.search-hit{padding:10px;border-radius:7px;cursor:pointer;display:flex;justify-content:space-between}.search-hit:hover{background:#f5f8fc}.top-actions{margin-left:auto;display:flex;gap:9px}.icon-btn{border:1px solid var(--line);background:white;border-radius:8px;width:37px;height:37px;cursor:pointer;position:relative}.dot{position:absolute;width:6px;height:6px;background:#ed5a63;border-radius:50%;right:8px;top:7px}.primary{border:0;background:var(--blue);color:white;border-radius:7px;padding:9px 16px;font-weight:600;cursor:pointer}.primary:hover{background:#1d5dd8}.small{font-size:13px}.secondary{border:1px solid #d9e0e7;background:white;color:#334155;border-radius:7px;padding:8px 14px;cursor:pointer}.danger{background:var(--red)}.content{padding:27px 30px 45px}.page-head{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:22px}.page-head h1{font-size:23px;margin:0 0 6px}.page-head p{margin:0;color:var(--muted)}.head-actions{display:flex;gap:8px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin-bottom:20px}.stat-card{background:white;border:1px solid var(--line);border-radius:10px;padding:18px;position:relative}.stat-label{color:#64748b;font-size:13px}.stat-num{font-size:27px;font-weight:700;margin-top:10px;letter-spacing:-.5px}.stat-sub{margin-top:8px;font-size:12px;color:#8793a2}.stat-sub b{color:var(--green)}.stat-icon{position:absolute;right:17px;top:17px;width:34px;height:34px;border-radius:8px;display:grid;place-items:center;background:var(--blueSoft);color:var(--blue)}.grid-2{display:grid;grid-template-columns:1.6fr 1fr;gap:16px}.panel{background:white;border:1px solid var(--line);border-radius:10px;margin-bottom:16px;overflow:hidden}.panel-head{padding:16px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.panel-head h2{font-size:15px;margin:0}.panel-head a{color:var(--blue);font-size:12px;cursor:pointer}.panel-body{padding:18px}.schedule-item{display:grid;grid-template-columns:74px 5px 1fr auto;gap:14px;align-items:center;padding:11px 0;border-bottom:1px solid #f0f2f4}.schedule-item:last-child{border:0}.schedule-item .time{font-weight:700}.schedule-item .time span{display:block;font-size:11px;color:#8b97a4;font-weight:400;margin-top:4px}.bar{height:38px;border-radius:4px;background:var(--blue)}.schedule-item h3{font-size:13px;margin:0 0 4px}.schedule-item p{margin:0;color:#7b8794;font-size:12px}.tag{padding:4px 9px;border-radius:99px;font-size:11px;white-space:nowrap}.tag.blue{background:var(--blueSoft);color:var(--blue)}.tag.green{background:var(--greenSoft);color:var(--green)}.tag.orange{background:var(--orangeSoft);color:var(--orange)}.tag.red{background:var(--redSoft);color:var(--red)}.todo{display:flex;align-items:center;gap:12px;padding:11px 0;border-bottom:1px solid #f0f2f4}.todo:last-child{border:0}.todo-icon{width:34px;height:34px;border-radius:8px;background:var(--orangeSoft);color:var(--orange);display:grid;place-items:center}.todo-text{flex:1}.todo-text strong{display:block;font-size:13px}.todo-text span{font-size:11px;color:#8793a2}.link-btn{border:0;background:none;color:var(--blue);font-size:12px;cursor:pointer}.toolbar{display:flex;gap:8px;padding:14px 16px;border-bottom:1px solid var(--line)}.toolbar input,.toolbar select,.form-field input,.form-field select,.form-field textarea{border:1px solid #dce2e8;border-radius:7px;padding:9px 11px;background:white;outline:0}.toolbar input{min-width:260px}.toolbar input:focus,.form-field input:focus,.form-field select:focus,.form-field textarea:focus{border-color:#7ba4f4;box-shadow:0 0 0 3px #edf3ff}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:13px}th{text-align:left;color:#748092;font-weight:500;background:#fafbfc;padding:11px 16px;border-bottom:1px solid var(--line);white-space:nowrap}td{padding:13px 16px;border-bottom:1px solid #edf0f2;white-space:nowrap}tbody tr:hover{background:#fbfcfe}.student-cell{display:flex;align-items:center;gap:9px}.mini-avatar{width:31px;height:31px;border-radius:50%;background:#e9eff9;color:#3766a3;display:grid;place-items:center;font-weight:700}.student-cell strong,.student-cell span{display:block}.student-cell span{font-size:11px;color:#8a96a3;margin-top:2px}.action-link{color:var(--blue);cursor:pointer;margin-right:12px}.pagination{padding:13px 16px;display:flex;justify-content:space-between;color:#7b8794;font-size:12px}.empty{padding:44px;text-align:center;color:#8b97a4}.detail-hero{background:white;border:1px solid var(--line);border-radius:10px;padding:20px;display:flex;align-items:center;gap:16px;margin-bottom:16px}.detail-avatar{width:54px;height:54px;border-radius:13px;background:#e8f0ff;color:#2f67ce;display:grid;place-items:center;font-size:21px;font-weight:700}.detail-hero h2{margin:0 0 5px}.detail-hero p{margin:0;color:#7b8794}.detail-hero .grow{flex:1}.course-card{border:1px solid var(--line);border-radius:9px;padding:15px;margin-bottom:10px}.course-card-top{display:flex;justify-content:space-between}.progress{height:6px;background:#edf1f5;border-radius:9px;margin-top:13px;overflow:hidden}.progress i{display:block;height:100%;background:var(--blue)}.course-meta{display:flex;justify-content:space-between;color:#7c8997;font-size:11px;margin-top:7px}.week{display:grid;grid-template-columns:60px repeat(5,1fr);min-width:760px}.week>div{border-right:1px solid var(--line);border-bottom:1px solid var(--line);min-height:58px;padding:7px}.week .day{text-align:center;background:#fafbfc;font-weight:600;min-height:auto}.week .hour{color:#8a96a3;font-size:11px;text-align:center}.session-block{border-left:3px solid var(--blue);background:var(--blueSoft);border-radius:4px;padding:6px!important;font-size:11px;color:#315c9c}.modal-backdrop{position:fixed;inset:0;background:rgba(15,23,42,.46);display:grid;place-items:center;z-index:100;padding:20px}.modal{background:white;border-radius:12px;box-shadow:0 20px 55px rgba(15,23,42,.25);width:min(560px,100%);max-height:90vh;overflow:auto}.modal-head{padding:18px 20px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}.modal-head h2{margin:0;font-size:17px}.close{border:0;background:none;font-size:20px;cursor:pointer;color:#7b8794}.modal-body{padding:20px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.form-field{display:flex;flex-direction:column;gap:6px}.form-field.full{grid-column:1/-1}.form-field label{font-size:12px;color:#5e6b7a}.form-field textarea{min-height:78px;resize:vertical}.modal-foot{padding:14px 20px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:8px}.toast{position:fixed;top:18px;left:50%;transform:translate(-50%,-20px);background:#152334;color:white;border-radius:8px;padding:11px 17px;z-index:200;opacity:0;pointer-events:none;transition:.25s}.toast.show{opacity:1;transform:translate(-50%,0)}.mobile-menu{display:none}.login-note{font-size:11px;color:#8693a2;margin-top:5px}
@media(max-width:900px){.stats{grid-template-columns:repeat(2,1fr)}.grid-2{grid-template-columns:1fr}.app-shell{grid-template-columns:1fr}.sidebar{transform:translateX(-100%);transition:.2s}.sidebar.open{transform:translateX(0)}main{grid-column:1}.mobile-menu{display:block;border:0;background:none;font-size:20px;margin-right:12px}.content{padding:20px}.topbar{padding:0 16px}kbd,.top-actions .icon-btn{display:none}}@media(max-width:560px){.stats{grid-template-columns:1fr}.content{padding:15px}.top-actions .primary{font-size:0;padding:9px 12px}.top-actions .primary:after{content:'＋';font-size:18px}.form-grid{grid-template-columns:1fr}.form-field.full{grid-column:1}.page-head{gap:12px}.toolbar{flex-wrap:wrap}.toolbar input{min-width:100%;width:100%}}
.login-screen{position:fixed;inset:0;z-index:300;background:radial-gradient(circle at 15% 10%,#294f82 0,transparent 28%),linear-gradient(135deg,#0e1b2b,#142c4a);display:grid;place-items:center;padding:20px}.login-card{width:min(420px,100%);background:white;border-radius:16px;padding:34px;box-shadow:0 28px 80px rgba(0,0,0,.28)}.login-brand{display:flex;align-items:center;gap:12px;padding-bottom:24px;border-bottom:1px solid var(--line)}.login-brand h1{font-size:18px;margin:0}.login-brand p{font-size:11px;color:#7d8998;margin:3px 0 0}.login-welcome{margin:27px 0 20px}.login-welcome h2{margin:0 0 7px;font-size:24px}.login-welcome p{margin:0;color:var(--muted)}.login-card .form-field{margin-bottom:15px}.login-card input{height:43px}.login-submit{width:100%;height:44px;margin-top:5px}.login-demo{text-align:center;background:#f5f7f9;color:#718096;border-radius:7px;padding:9px;margin-top:18px;font-size:11px}.login-error{background:var(--redSoft);color:var(--red);padding:9px;border-radius:6px;margin-bottom:10px;font-size:12px}.teacher-card-grid,.room-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.teacher-card,.room-card{background:white;border:1px solid var(--line);border-radius:10px;overflow:hidden}.teacher-cover{height:128px;background:linear-gradient(135deg,#dfe9f7,#f1f5fa);display:grid;place-items:center;color:#7890ac;font-size:42px}.teacher-cover img{width:100%;height:100%;object-fit:cover}.teacher-info,.room-card{padding:14px}.teacher-info h3,.room-card h3{margin:0 0 6px}.teacher-info p{margin:5px 0;color:#6f7d8c;font-size:12px}.room-status{display:grid;grid-template-columns:84px 1fr;gap:7px;margin-top:13px}.slot{font-size:11px;padding:7px;border-radius:5px;background:var(--greenSoft);color:var(--green)}.slot.busy{background:var(--redSoft);color:var(--red)}.fee-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.fee-item{border:1px solid var(--line);border-radius:7px;padding:10px}.fee-item span,.fee-item b{display:block}.fee-item span{color:#7b8794;font-size:11px}.fee-item b{margin-top:5px}.permission-table input{width:16px;height:16px}.permission-note{background:#f4f7fb;border-left:3px solid var(--blue);padding:11px 13px;color:#5d6b7a;margin-bottom:14px;font-size:12px}.media-preview{display:flex;gap:10px;flex-wrap:wrap}.media-tile{width:110px;height:82px;border:1px solid var(--line);border-radius:7px;display:grid;place-items:center;overflow:hidden;background:#f7f9fb;font-size:11px}.media-tile img,.media-tile video{width:100%;height:100%;object-fit:cover}.media-tile audio{width:105px}@media(max-width:900px){.teacher-card-grid,.room-grid{grid-template-columns:repeat(2,1fr)}.fee-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:560px){.teacher-card-grid,.room-grid{grid-template-columns:1fr}}
.teacher-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}.muted-text{color:#8a94a4;font-size:13px}.danger-text{color:#c93d4a!important}

/* 老师管理卡片：头像使用独立窗口，资料区域不与图片重叠。 */
.teacher-card-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.teacher-card{display:grid;grid-template-columns:112px minmax(0,1fr);align-items:start;min-height:176px;padding:16px;gap:16px;overflow:visible}
.teacher-cover{width:112px;height:136px;border:1px solid #dbe4ef;border-radius:10px;overflow:hidden;align-self:start;background:linear-gradient(135deg,#e7eef8,#f7f9fc);box-shadow:0 4px 14px rgba(28,55,88,.08)}
.teacher-cover img{display:block;width:100%;height:100%;object-fit:cover;object-position:center}
.teacher-info{min-width:0;padding:0;position:relative}
.teacher-info h3,.teacher-info p{overflow-wrap:anywhere}
@media(max-width:900px){.teacher-card-grid{grid-template-columns:1fr}}
@media(max-width:560px){.teacher-card{grid-template-columns:88px minmax(0,1fr);padding:12px;gap:12px}.teacher-cover{width:88px;height:108px}}