:root{color-scheme:light;--bg:#f7f8fa;--surface:#fff;--ink:#24262b;--muted:#606875;--line:#d9dde4;--blue:#3d61cf;--blue-soft:#edf1ff;--green:#276d4c;--green-soft:#eaf6ee;--amber:#805a12;--amber-soft:#fff5df;--red:#ad3434;--red-soft:#fff0ef;--radius:12px;font:16px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--bg)}
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{-webkit-tap-highlight-color:transparent}button,a,summary{touch-action:manipulation}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button{cursor:pointer}button:disabled{cursor:wait;opacity:.6}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:3px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(1.7rem,4vw,2.2rem);line-height:1.3;letter-spacing:-.03em;margin-bottom:.5rem}h2{font-size:1.35rem;line-height:1.4}h3{font-size:1.1rem;line-height:1.4}p{margin-bottom:1rem}small{font-size:.8rem}.skip-link{position:fixed;left:16px;top:-60px;z-index:20;padding:10px 16px;background:var(--surface);border:2px solid var(--blue)}.skip-link:focus{top:10px}.site-header{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:80px;padding:12px max(24px,calc((100vw - 1120px)/2));background:#24262b;color:#fff}.brand{display:flex;align-items:center;gap:10px;color:#fff;min-height:44px;flex-shrink:0}.brand:hover{text-decoration:none}.brand-mark{display:grid;place-items:center;width:40px;height:40px;background:#fff;border-radius:8px}.brand-mark svg{width:28px;height:28px;fill:none;stroke:#4d73e6;stroke-width:2}.brand strong{display:block;font-size:1.1rem;line-height:1.25}.brand small{display:block;color:#d0d5df;font-size:.75rem}.header-actions{display:flex;align-items:center;justify-content:flex-end;gap:16px;flex-wrap:wrap}.header-actions>a{display:flex;align-items:center;min-height:44px;color:#dbe4ff;font-size:.9rem}.header-actions button{min-height:44px;border:1px solid #686e79;border-radius:6px;padding:8px 12px;color:#fff;background:transparent}.header-actions button:hover{background:#373b43}#accountActions{display:flex;align-items:center;gap:8px}#main{max-width:1168px;padding:32px 24px 48px;margin:auto;min-height:calc(100vh - 156px);outline:none}.site-footer{display:flex;justify-content:space-between;gap:12px;max-width:1168px;margin:auto;padding:24px;color:var(--muted);font-size:.8rem;border-top:1px solid var(--line)}.loading{padding:64px 24px;text-align:center;color:var(--muted)}.login-layout{display:grid;grid-template-columns:1fr 440px;align-items:center;gap:72px;padding:56px 0 80px;max-width:980px;margin:auto}.login-copy p{max-width:420px;color:var(--muted)}.login-copy h1{font-size:2.5rem}.login-steps{padding:0;margin:28px 0 0;list-style:none;display:grid;gap:12px}.login-steps li{padding:12px 0;border-top:1px solid var(--line)}.login-panel,.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}.login-panel h2{margin-bottom:4px}.muted{color:var(--muted)}.help{font-size:.86rem;color:var(--muted);margin:8px 0 0}.form-grid{display:grid;gap:16px}label.field{display:grid;gap:6px;font-weight:600;font-size:.9rem}input,select,textarea{width:100%;min-height:44px;border:1px solid #b0b7c3;border-radius:6px;padding:10px 12px;background:var(--surface);color:var(--ink)}textarea{min-height:100px;resize:vertical;font-weight:400}input::placeholder,textarea::placeholder{color:#727b89}input[type=checkbox]{width:20px;height:20px;min-height:20px;margin:0;accent-color:var(--blue);flex-shrink:0}.check-label{display:flex;align-items:center;gap:10px;min-height:44px;cursor:pointer;font-size:.9rem;font-weight:400}.check-label span{min-width:0}.button,.button-link{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 16px;border:1px solid #a7afbd;border-radius:6px;background:var(--surface);color:var(--ink);font-weight:600;font-size:.9rem;line-height:1.4;text-align:center;transition:background .15s,border-color .15s}.button:hover,.button-link:hover{background:#f0f2f6;text-decoration:none;border-color:#626d80}.button:active{background:#e4e8f0}.button.primary{background:var(--blue);color:#fff;border-color:var(--blue)}.button.primary:hover{background:#304fb0}.button.primary:active{background:#244091}.button.danger{color:var(--red);border-color:#d59d9d}.button.danger:hover{background:var(--red-soft)}.button.quiet{border-color:transparent;background:transparent;color:var(--blue)}.button.quiet:hover{background:var(--blue-soft)}.full-width{width:100%}.error{color:var(--red);font-size:.9rem;margin:0;white-space:pre-line}.error:empty{display:none}.notice{border-left:3px solid var(--blue);padding:12px 16px;background:var(--blue-soft);font-size:.9rem;margin-bottom:20px}.notice p:last-child{margin-bottom:0}.page-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:24px}.page-head p{margin:4px 0 0;color:var(--muted)}.identity{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:.9rem;margin-bottom:8px}.identity strong{font-weight:600}.tag{display:inline-flex;align-items:center;padding:2px 8px;border-radius:4px;background:#e9ecf2;color:#465164;font-size:.76rem}.tabs{display:flex;align-items:center;gap:8px;border-bottom:1px solid var(--line);margin-bottom:28px;overflow-x:auto;scrollbar-width:thin;padding-bottom:8px}.tabs button{white-space:nowrap;min-height:44px;padding:10px 16px;border:0;border-radius:6px;background:transparent;color:var(--muted);font-weight:600;font-size:.95rem}.tabs button:hover{background:#e9edf4}.tabs button[aria-current=page]{background:var(--blue);color:#fff}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}.section-heading h2{margin:0}.section-heading p{margin:4px 0 0;color:var(--muted);font-size:.9rem}.course-list{display:grid;gap:16px}.course-card{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,.8fr);gap:28px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}.course-title{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:12px}.course-title h3{margin:0;font-size:1.2rem}.meta{display:grid;gap:6px;font-size:.9rem;color:var(--muted);margin:0}.meta dt{display:inline;font-weight:400;margin-right:10px}.meta dd{display:inline;margin:0;color:var(--ink)}.course-actions{border-left:1px solid var(--line);padding-left:24px;display:grid;align-content:start;gap:12px}.inline-form{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:12px}.inline-form .error{grid-column:1/-1}.code-input{font-size:1.35rem;letter-spacing:.16em;font-variant-numeric:tabular-nums;padding:8px 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b{color:var(--ink);font-weight:500}.success-text{color:var(--green)}.empty{padding:48px 24px;text-align:center;border:1px dashed #b7beca;border-radius:var(--radius);background:var(--surface)}.empty h3{margin-bottom:8px}.empty p{margin-bottom:0;color:var(--muted);font-size:.9rem}.summary-strip{display:flex;gap:24px;flex-wrap:wrap;padding:16px 20px;background:var(--surface);border:1px solid var(--line);border-radius:8px;margin-bottom:20px}.summary-strip span{font-size:.9rem;color:var(--muted)}.summary-strip b{color:var(--ink);margin-left:8px;font-size:1.2rem;font-variant-numeric:tabular-nums}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px;background:var(--surface)}table{width:100%;border-collapse:collapse;text-align:left;font-size:.88rem}th{background:#f0f2f6;font-weight:600;color:#455062;padding:12px 16px;white-space:nowrap}td{padding:14px 16px;border-top:1px solid 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var(--line);padding-top:16px}.code-block{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.code-value{font-size:1.8rem;font-weight:700;letter-spacing:.16em;font-variant-numeric:tabular-nums;color:var(--blue)}.code-block p{margin:0;font-size:.8rem;color:var(--muted)}.mode-form{display:flex;align-items:flex-end;gap:8px;flex-wrap:wrap}.mode-form .field{font-weight:400}.mode-form select{width:auto;min-width:160px}.mode-form .error{flex-basis:100%}.member-form{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.member-form select{width:auto;min-width:110px}.member-form .error{flex-basis:100%}.member-notes{max-width:310px}.member-filter{display:flex;align-items:flex-end;gap:12px;margin-bottom:20px}.member-filter .field{max-width:360px;flex:1}.password-panel{max-width:480px;margin:24px auto}.two-columns{display:grid;grid-template-columns:1fr 1fr;gap:16px}.row-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.row-actions.end{justify-content:flex-end}.expected-list{max-height:260px;overflow:auto;display:grid;grid-template-columns:1fr 1fr;gap:0 12px;border:1px solid var(--line);padding:12px;border-radius:6px;background:#fafbfc}.expected-list .check-label{align-items:flex-start;padding:8px 4px;line-height:1.5}.expected-list input{margin-top:3px}.expected-list small{display:block;color:var(--muted)}.expected-details{border-top:1px solid var(--line);padding-top:12px}.expected-details summary{min-height:44px;cursor:pointer;font-weight:600;font-size:.9rem}.expected-tools{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:8px 0}.expected-tools .button{font-size:.8rem;padding:8px 12px}.expected-count{font-size:.9rem;color:var(--muted);margin:0 0 8px}dialog{width:min(660px,calc(100vw - 32px));max-height:calc(100dvh - 32px);padding:0;border:1px solid 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#161d3633;z-index:30;pointer-events:none;opacity:0;transition:opacity .15s;white-space:normal}.toast.visible{opacity:1}.standalone-error{max-width:560px;margin:48px auto}.standalone-error .error{margin-bottom:20px}[hidden]{display:none!important}
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@media(max-width:680px){.site-header{padding:12px 16px;align-items:center;gap:8px;min-height:72px}.header-actions{gap:8px}.header-actions>a{font-size:.8rem}.header-actions button{font-size:.8rem;padding:8px}.brand strong{font-size:1rem}.brand-mark{width:34px;height:34px}.brand-mark svg{width:25px;height:25px}#accountActions{gap:4px}#main{padding:24px 16px 40px}.site-footer{padding:20px 16px;flex-direction:column;gap:4px}.login-layout{display:block;padding:16px 0 40px}.login-copy h1{font-size:1.85rem}.login-copy>p{margin-bottom:24px}.login-steps{display:none}.login-panel,.panel{padding:20px}.page-head{margin-bottom:20px;gap:12px}.page-head>.button{padding:8px 12px;flex-shrink:0}.page-head h1{font-size:1.6rem}.page-head p{font-size:.86rem}.tabs{margin-left:-16px;margin-right:-16px;padding-left:16px;padding-right:16px;gap:4px;margin-bottom:24px}.tabs button{padding:10px 12px;font-size:.9rem}.section-heading{align-items:flex-start}.section-heading p{font-size:.85rem}.course-card{display:block;padding:20px}.course-title{gap:8px}.course-title h3{font-size:1.1rem}.course-actions{border-left:0;border-top:1px solid var(--line);margin-top:18px;padding:18px 0 0}.inline-form{grid-template-columns:minmax(0,1fr) auto;gap:10px}.inline-form .button{width:auto;padding:10px 14px}.summary-strip{gap:12px 20px;padding:14px 16px}.summary-strip span{font-size:.83rem}.summary-strip b{font-size:1.05rem;margin-left:6px}.filters{gap:12px}.filters .field:first-child{grid-column:1/-1}.filters .button{width:100%;grid-column:1/-1}.filters .search-field{grid-column:1/-1}.table-wrap{border:0;border-radius:0;background:transparent;overflow:visible}table,tbody{display:block}thead{display:none}tr{display:block;border:1px solid var(--line);border-radius:8px;background:var(--surface);padding:8px 16px;margin-bottom:12px}td{display:grid;grid-template-columns:72px minmax(0,1fr);gap:12px;padding:10px 0;border:0;overflow-wrap:anywhere}td:before{content:attr(data-label);color:var(--muted);font-size:.8rem;font-weight:400}td>div{min-width:0}td>.status{justify-self:start}td+.cell-actions{border-top:1px solid var(--line)}.cell-detail.reason{max-width:none}.manage-course{padding:18px}.manage-course-head{gap:12px}.manage-course-head .row-actions{justify-content:flex-end}.manage-course-head .button{padding:8px 12px;font-size:.8rem}.manage-course-tools{gap:16px}.code-block{width:100%;justify-content:space-between;gap:10px}.mode-form{width:100%}.mode-form .field{flex:1}.mode-form select{width:100%;min-width:0}.two-columns{grid-template-columns:1fr}.expected-list{grid-template-columns:1fr}.member-form{min-width:0}.member-form select{width:100%}.member-filter{align-items:stretch;flex-direction:column}.member-filter .field{max-width:none}.password-panel{margin:16px auto}.dialog-head{padding:12px 16px}#modalBody{padding:20px 16px}dialog{width:calc(100vw - 24px);max-height:calc(100dvh - 24px)}.temporary-password{font-size:1.2rem}.identity{font-size:.83rem}}
@media(max-width:360px){.site-header{flex-wrap:wrap}.header-actions{width:100%;justify-content:space-between}.inline-form{grid-template-columns:1fr}.inline-form .button{width:100%}.filters{grid-template-columns:1fr}.filters .field{grid-column:1/-1}}
.list-count{margin:0 0 12px}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}