:root{font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif;color:#26394d;background:#f5f7fb;font-synthesis:none}*{box-sizing:border-box}body{margin:0;font-size:14px}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}[hidden]{display:none!important}.layout{display:flex;min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;background:#152e4d;color:#fff;width:242px;display:flex;flex-direction:column;box-shadow:4px 0 28px #142b4522}.sidebar-brand{display:flex;align-items:center;gap:12px;padding:30px 22px 28px;border-bottom:1px solid #ffffff1a}.sidebar-brand b{display:block;font-size:17px;letter-spacing:1px}.sidebar-brand small{display:block;font-size:10px;letter-spacing:2px;color:#8aa7c5;margin-top:5px}.brand-symbol,.brand-icon{display:grid;place-items:center;background:#d0aa78;color:#fff;font-weight:800;border-radius:12px;font-size:21px;width:43px;height:43px}.sidebar-caption{font-size:11px;color:#7591b3;padding:32px 24px 12px;letter-spacing:2px}.nav-btn{border:0;background:transparent;color:#acc2d9;width:calc(100% - 24px);margin:2px 12px;padding:14px 16px;text-align:left;border-radius:9px;display:flex;align-items:center;gap:15px}.nav-btn span{font-size:20px;width:20px;text-align:center}.nav-btn:hover,.nav-btn.active{background:#315479;color:#fff}.nav-btn.active{box-shadow:inset 3px 0 #d7ac77}.sidebar-bottom{margin-top:auto;font-size:12px;padding:20px 22px;color:#8da4c0;border-top:1px solid #ffffff18}.tiny-dot{display:inline-block;border-radius:50%;width:7px;height:7px;background:#7fc2ac;margin-right:6px}.content{width:calc(100% - 242px);margin-left:242px}.topbar{height:76px;background:#fff;border-bottom:1px solid #eaf0f6;display:flex;align-items:center;justify-content:space-between;padding:0 40px}.breadcrumb,.muted{color:#8594a5}.header-actions{display:flex;align-items:center;gap:25px}.environment{font-size:12px;color:#4d876c}.avatar{border:0;background:#e7eff7;color:#21466f;border-radius:50%;width:36px;height:36px;font-weight:700}.main{padding:34px 40px 70px;max-width:1600px;margin:auto}.page-header{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:26px}.page-header h1{font-size:25px;margin:0 0 7px;color:#183756}.page-header p{margin:0;color:#8798a9;font-size:13px}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:22px}.stat{border:1px solid #edf0f5;border-radius:13px;padding:23px;background:#fff;box-shadow:0 4px 18px #132b4807}.stat .name{font-size:13px;color:#8090a5}.stat strong{font-size:31px;display:block;margin:12px 0 7px;color:#193c60}.stat small{color:#a0b0bf}.stat .mark{float:right;background:#edf3f8;color:#427095;padding:8px;border-radius:8px}.dash-split{display:grid;grid-template-columns:1.4fr 1fr;gap:22px}.panel{background:#fff;border-radius:14px;padding:24px;border:1px solid #edf0f5;box-shadow:0 4px 18px #132b4808}.panel-title{font-size:16px;font-weight:700;color:#213c58;margin-bottom:21px}.quick-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.quick{padding:23px;text-align:left;color:#2e4b68;background:#f6f9fc;border:1px solid #e9eff6;border-radius:10px;font-weight:600}.quick span{font-size:21px;color:#bd9461;padding-right:8px}.notice{background:linear-gradient(120deg,#fff,#fbf6ee);line-height:1.9}.notice p{font-size:13px;color:#64788e}.toolbar{display:flex;align-items:center;gap:12px;margin-bottom:20px}.search{width:270px}input,select,textarea{border:1px solid #dfe7ef;border-radius:8px;background:#fff;padding:11px 12px;outline:0;color:#25415e;min-height:41px}input:focus,select:focus,textarea:focus{border-color:#688bb1;box-shadow:0 0 0 3px #3779c313}textarea{resize:vertical}.btn{border:0;border-radius:8px;padding:11px 17px;white-space:nowrap;font-weight:600}.btn.primary{background:#1e4d79;color:#fff}.btn.primary:hover{background:#153858}.btn.outline{color:#2e577b;border:1px solid #d4e0ea;background:#fff}.btn.danger{color:#ad4141;background:#fff1f1}.btn.small{font-size:12px;padding:7px 9px}.btn.full{width:100%}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left;min-width:750px}th{font-weight:600;color:#8796a7;background:#f8fafc;font-size:12px;padding:13px 14px}td{border-bottom:1px solid #eff2f5;padding:15px 14px;color:#40566c;font-size:13px}tr:last-child td{border-bottom:0}.course-name{font-weight:600;color:#213a56;max-width:260px}.course-sub{font-size:12px;color:#a0abba;margin-top:5px}.cover{width:74px;height:49px;object-fit:cover;border-radius:6px;background:#e7eef6}.course-info{display:flex;gap:12px;align-items:center}.tag{display:inline-block;border-radius:20px;padding:5px 9px;font-size:11px;background:#edf5fd;color:#4c7194}.tag.green{background:#e9f7f0;color:#268363}.tag.gray{background:#f0f2f5;color:#778494}.tag.gold{background:#fff4e4;color:#b67e40}.action{border:0;background:transparent;color:#2f679b;padding:4px;font-weight:600}.action.warn{color:#b06464}.action+ .action{margin-left:5px}.empty{padding:40px;text-align:center;color:#9dabbb}.settings-panel{max-width:750px}.settings-panel form,.field-grid{display:grid;gap:16px}.settings-panel label,.field-grid label,.auth-card label{display:flex;flex-direction:column;gap:7px;font-size:13px;color:#5a6e82;font-weight:600}.settings-panel textarea{width:100%}.settings-panel .btn{justify-self:start}.auth-overlay{position:fixed;inset:0;z-index:20;display:grid;place-items:center;background:radial-gradient(circle at 75% 20%,#365c86,#102a47 60%)}.auth-card{background:#fff;width:min(410px,calc(100vw - 32px));padding:38px 42px;border-radius:18px;box-shadow:0 30px 90px #00132c55}.brand-icon{margin:0 auto 20px;width:55px;height:55px}.auth-title{font-size:24px;text-align:center;font-weight:800;color:#1b3a5c}.auth-card p{text-align:center;color:#9bacbd;margin:10px 0 30px}.auth-card label{margin-top:16px}.auth-card .btn{margin-top:26px}.auth-foot{text-align:center;margin-top:20px;font-size:11px;color:#a8b4c0}.modal-backdrop{position:fixed;inset:0;background:#102437a8;display:grid;place-items:center;z-index:10;padding:15px}.modal{width:min(780px,100%);max-height:94vh;overflow:auto;background:#fff;border-radius:14px;box-shadow:0 35px 100px #0003}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px 26px;border-bottom:1px solid #ebeff4}.modal-header h2{margin:0;font-size:19px}.icon-close{border:0;background:none;font-size:27px;color:#9aabbc}.modal form{padding:25px 26px}.field-grid{grid-template-columns:repeat(2,1fr)}.field-grid label.wide{grid-column:span 2}.field-grid input,.field-grid textarea,.field-grid select{width:100%;font-weight:400}.form-footer{display:flex;justify-content:flex-end;gap:12px;margin-top:25px}.upload-line{display:flex;gap:10px;align-items:center}.upload-line input[type=file]{min-width:0;width:180px;font-size:11px}.upload-line input[type=text]{flex:1;min-width:0}.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);z-index:100;background:#193652;color:white;padding:12px 23px;border-radius:9px;box-shadow:0 10px 25px #0003}@media(max-width:1050px){.stats-grid{grid-template-columns:repeat(2,1fr)}.dash-split{grid-template-columns:1fr}.main{padding:24px}.topbar{padding:0 24px}}@media(max-width:720px){.sidebar{width:65px}.sidebar-brand{padding:18px 10px}.sidebar-brand div,.sidebar-caption,.sidebar-bottom{display:none}.nav-btn{width:53px;margin:6px;padding:14px}.nav-btn span{width:auto}.nav-btn{font-size:0;gap:0}.nav-btn span{font-size:23px}.content{width:calc(100% - 65px);margin-left:65px}.topbar{height:60px}.main{padding:16px}.stats-grid{grid-template-columns:repeat(2,1fr);gap:10px}.panel{padding:14px}.page-header h1{font-size:20px}.environment{display:none}.field-grid{grid-template-columns:1fr}.field-grid label.wide{grid-column:span 1}}