:root{--ink:#173a34;--teal:#147d69;--mint:#e8f6f1;--paper:#f8f9f6;--line:#e2e8e1;--muted:#748580;--white:#fff;--amber:#fff2d9}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans SC","Microsoft YaHei",sans-serif;font-size:15px}button,input,select,textarea{font:inherit}button{cursor:pointer}h1{font-size:31px;margin:0 0 22px}h2{font-size:22px;margin:0 0 20px}h3{font-size:18px;margin:0 0 14px}p{color:var(--muted);line-height:1.7}.app{display:grid;grid-template-columns:246px minmax(0,1fr);min-height:100vh}.sidebar{background:#fff;padding:33px 26px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column}.logo{font-size:30px;font-weight:800;color:var(--teal);letter-spacing:1px}.eyebrow{color:var(--muted);font-size:13px;margin-top:14px}.sidebar nav{margin-top:56px;display:grid;gap:10px}.nav-item{border:0;background:transparent;color:var(--ink);text-align:left;padding:15px 16px;border-radius:12px;font-weight:600}.nav-item span{color:var(--muted);font-size:12px;margin-right:12px}.nav-item.active{background:var(--mint);color:var(--teal)}.sidebar-foot{margin-top:auto;color:var(--muted);font-size:13px;line-height:2}.main{padding:0 38px 60px;min-width:0}header{height:86px;display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:14px}.header-right{color:var(--ink);display:flex;align-items:center;gap:15px}.badge{background:var(--mint);color:var(--teal);padding:8px 12px;border-radius:8px;font-size:12px;font-weight:700}.text-button{border:0;background:transparent;color:var(--teal)}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:24px;margin:24px 0 28px}.page-heading p{margin-bottom:0}.primary,.secondary,.danger{border-radius:13px;padding:13px 25px;min-width:150px;border:1px solid var(--teal);font-weight:700}.primary{background:var(--teal);color:#fff}.secondary{background:#fff;color:var(--ink);border-color:var(--line)}.danger{background:#fff;color:#ad4d44;border-color:#e9cbc6}.small{padding:8px 13px;min-width:0;font-size:13px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.card{background:#fff;border-radius:23px;padding:28px;min-width:0}.card.tinted{background:var(--mint)}.stat-label{color:var(--muted);font-size:14px}.stat-value{font-size:38px;font-weight:800;margin-top:20px}.row{display:flex;align-items:center;gap:14px}.between{display:flex;align-items:center;justify-content:space-between;gap:15px}.muted{color:var(--muted)}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.field{display:flex;flex-direction:column;gap:8px;font-size:14px;font-weight:600;margin:16px 0}.field input,.field select,.field textarea,.login-card input{width:100%;border:1px solid #d7dfd9;background:#fff;border-radius:11px;padding:13px 15px;color:var(--ink);outline-color:var(--teal)}.field textarea{min-height:90px}.form-actions{display:flex;gap:12px;margin-top:22px}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:#fff}.table{width:100%;border-collapse:collapse;white-space:nowrap}.table th,.table td{padding:15px 18px;border-bottom:1px solid var(--line);text-align:left}.table th{color:var(--muted);font-size:13px;background:#fbfcfa}.table tr:last-child td{border-bottom:0}.table button{border:0;background:none;color:var(--teal);font-weight:600;padding:4px}.section{margin:28px 0}.hero{background:var(--mint);border-radius:22px;padding:24px;margin:20px 0 26px}.hero strong{color:var(--teal)}.pill{display:inline-block;background:var(--mint);color:var(--teal);padding:7px 12px;border-radius:8px;font-size:12px}.pill.amber{background:var(--amber);color:#a66a1b}#notice{position:fixed;right:30px;top:90px;z-index:30;max-width:440px}.notice{background:var(--ink);color:#fff;border-radius:12px;padding:13px 18px;box-shadow:0 12px 36px #173a3433}.notice.error{background:#a6463d}.login-page{min-height:100vh;display:grid;place-items:center;background:linear-gradient(125deg,#e6f3ec 0,#f8f9f6 55%)}.login-card{width:min(500px,calc(100vw - 35px));background:#fff;padding:46px;border-radius:26px;box-shadow:0 16px 50px #173a3414}.login-card h1{margin-top:50px}.login-card label{display:block;margin-top:18px;font-weight:650}.login-card input{margin-top:8px}.login-card button{width:100%;margin-top:25px}.error{background:#fae8e5;color:#a13c35;padding:12px;border-radius:10px;margin-top:16px}.empty{padding:45px;text-align:center;background:#fff;border-radius:20px;color:var(--muted)}.right{text-align:right}.wrap{white-space:normal!important}.bar{height:9px;border-radius:6px;background:#e7efe9;margin-top:12px}.bar>i{display:block;height:100%;border-radius:6px;background:var(--teal)}@media(max-width:900px){.app{grid-template-columns:1fr}.sidebar{position:static;height:auto;padding:20px}.sidebar nav{display:flex;overflow:auto;margin-top:20px}.nav-item{white-space:nowrap}.sidebar-foot{display:none}.main{padding:0 18px 40px}.grid,.grid.four,.form-grid{grid-template-columns:1fr}header{height:65px}}
[hidden]{display:none!important}
button:disabled{cursor:not-allowed;opacity:.5}#concept-form-area summary,#concept-reference-area summary,#concept-preview summary{padding:14px 0;cursor:pointer;font-weight:700;border-bottom:1px solid var(--line)}#concept-form-area details,#concept-preview details{margin-bottom:20px}#concept-list .wrap{min-width:260px}#concept-form-area pre{overflow-wrap:anywhere}
.roster-grade-box{border:1px solid var(--line);border-radius:12px;padding:15px;display:flex;flex-wrap:wrap;gap:16px;margin:18px 0}.roster-grade-box legend{font-weight:600;font-size:14px}.roster-grade-box label{display:flex;align-items:center;gap:7px}.roster-grade-box input{accent-color:var(--teal);width:18px;height:18px}.roster-filter{display:flex;flex-wrap:wrap;align-items:end;gap:14px;margin-bottom:20px}.roster-filter .field{flex:1;min-width:150px;margin:0}.roster-filter button{margin:0}.roster-actions{white-space:normal!important;min-width:150px}.table .danger-text,.danger-text{color:#a6463d}.quick-links a{text-decoration:none;display:inline-flex;align-items:center}.roster-filter input{min-width:0}@media(max-width:600px){.roster-filter .field{flex-basis:100%}.roster-filter button{width:100%}.header-right{gap:7px;font-size:12px}#breadcrumb{font-size:12px}}
@media(max-width:900px){.app{grid-template-columns:minmax(0,1fr)}.sidebar{min-width:0;max-width:100%}.sidebar nav{min-width:0;max-width:100%}.nav-item{flex-shrink:0}.page-heading{flex-wrap:wrap;align-items:flex-start}.page-heading>div{width:100%}.header-right .badge{display:none}}
.log-output{margin:12px 0 0;padding:18px;min-height:360px;max-height:70vh;overflow:auto;background:#152c28;color:#e6f3ec;border-radius:12px;font:12px/1.6 Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere}
@media(min-width:901px){.sidebar nav{min-height:0;overflow-y:auto;margin-top:30px}}
.quick-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.quick-links .secondary{min-width:0}.filter-bar{display:flex;flex-wrap:wrap;gap:16px;align-items:end;background:#fff;border-radius:18px;padding:18px 22px;margin-bottom:20px}.filter-field{display:flex;flex-direction:column;gap:7px;color:var(--muted);font-size:13px;font-weight:700}.filter-field select{min-width:170px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);padding:10px 12px}.result-count{font-size:13px;margin:0 0 12px}.table small{display:block;color:var(--muted);font-size:12px;margin-top:5px}.detail-panel{margin-top:26px}.detail-panel h2{margin-bottom:5px}.detail-panel h3{margin-top:28px}.detail-meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;color:var(--muted);font-size:13px;margin:18px 0 24px}.detail-text{padding:16px 0;border-top:1px solid var(--line)}.detail-text h3{font-size:15px;margin:0 0 7px}.detail-text p{color:var(--ink);white-space:pre-wrap;overflow-wrap:anywhere;margin:0}.file-list{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0 24px}

.import-preview{max-height:560px;overflow:auto}.import-cell{min-width:105px;max-width:170px;width:100%;padding:8px;border:1px solid #d8e4df;border-radius:6px;font:inherit}.import-preview td:last-child{min-width:170px}.import-preview td{vertical-align:top} #admin-course-error:empty,#admin-import-error:empty{display:none}

.legal-check{display:flex;align-items:flex-start;gap:10px;margin:18px 0;font-size:14px;line-height:1.7}.legal-check input{width:18px;height:18px;flex-shrink:0;margin-top:3px;accent-color:#147d69}details{margin:16px 0}summary{cursor:pointer;padding:14px;background:#edf6f1;border-radius:8px}textarea{max-width:100%;box-sizing:border-box}