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.st-part-icon{color:var(--st-success)}.st-part-locked{color:var(--st-text-muted)}.st-bubble{max-width:min(560px,85%);padding:var(--st-2) var(--st-3);border-radius:var(--st-radius);background:var(--st-surface);border:1px solid var(--st-line)}.st-bubble-me{background:var(--st-brand-50);border-color:#0000;margin-left:auto}@media (max-width:640px){.st-card{padding:var(--st-4)}.st-container{padding:0 var(--st-3)}.st-nav a{padding:var(--st-2)}}.st-auth{max-width:440px;padding-top:var(--st-6);padding-bottom:var(--st-6)}.st-app .st-auth h1{font-size:var(--st-fs-2xl);margin:0}.st-steps{padding-left:var(--st-5);margin:0}.st-steps li+li{margin-top:var(--st-2)}.st-page{padding-top:var(--st-5);padding-bottom:var(--st-7)}.st-app .st-page-title{font-size:var(--st-fs-2xl);margin:0}.st-app .st-card-heading{font-size:var(--st-fs-lg);margin:0}.st-q-stem{white-space:pre-wrap;font-size:var(--st-fs-lg);margin:var(--st-1) 0 var(--st-3)}.st-q-img{max-width:100%;height:auto;margin:var(--st-2) 0;border-radius:var(--st-radius-sm);display:block}.st-q-options{gap:var(--st-2);margin:0;padding:0;list-style:none;display:grid}.st-q-options li{border:1px solid var(--st-line-strong);border-radius:var(--st-radius);background:var(--st-surface);white-space:pre-wrap}.st-q-options li label{padding:var(--st-3);cursor:pointer;-webkit-tap-highlight-color:transparent;display:block}.st-q-options li input{vertical-align:middle;width:20px;height:20px;accent-color:var(--st-primary)}.st-q-options li.picked{border-color:var(--st-primary);background:var(--st-brand-50)}.st-q-options li.right{border-color:var(--st-success);background:var(--st-success-bg)}.st-q-options li.wrong{border-color:var(--st-danger);background:var(--st-danger-bg)}.st-q-tag{font-size:var(--st-fs-xs);color:var(--st-text-muted);font-weight:600}.st-q-result{border-top:1px dashed var(--st-line-strong);margin-top:var(--st-3);padding-top:var(--st-3)}.st-q-result .ok{color:var(--st-success)}.st-q-result .bad{color:var(--st-danger)}.st-q-expl{white-space:pre-wrap}.st-score{font-size:var(--st-fs-2xl);margin:0;font-weight:700}.st-q-nav{gap:var(--st-2);flex-wrap:wrap;display:flex}.st-q-nav button{border:1px solid var(--st-line-strong);border-radius:var(--st-radius-sm);background:var(--st-surface);min-width:40px;min-height:40px;color:var(--st-text);font:inherit;cursor:pointer}.st-q-nav button.done{border-color:var(--st-primary);background:var(--st-brand-50)}.st-q-nav button.cur{background:var(--st-primary);border-color:var(--st-primary);color:#fff}

:root{--bg:var(--st-bg);--fg:var(--st-text);--muted:var(--st-text-muted);--line:var(--st-line);--accent:var(--st-primary);--error:var(--st-danger);--warn-bg:var(--st-warning-bg);font-family:var(--font-nunito), system-ui, -apple-system, "PingFang HK", "Microsoft JhengHei", "Noto Sans TC", sans-serif}*{box-sizing:border-box}html,body{background:var(--st-bg);color:var(--fg);margin:0}a{color:inherit}.card{border:1px solid var(--line);border-radius:12px;max-width:420px;margin:12vh auto;padding:24px}.spacer{flex:1}.content{max-width:960px;margin:0 auto;padding:24px 20px}button{border:1px solid var(--line);color:inherit;font:inherit;cursor:pointer;background:0 0;border-radius:8px;padding:8px 14px}button.primary{background:var(--accent);color:var(--st-on-primary);border-color:var(--accent)}button:disabled{opacity:.6;cursor:default}input,select{border:1px solid var(--line);color:inherit;font:inherit;background:0 0;border-radius:8px;padding:8px 10px}table{border-collapse:collapse;width:100%;margin:12px 0 24px}th,td{text-align:left;border-bottom:1px solid var(--line);padding:8px 10px;font-size:14px}.row{gap:8px;display:flex}.muted{color:var(--muted)}.small{font-size:13px}.error{color:var(--error)}.warn{background:var(--warn-bg);border-radius:8px;padding:10px 14px}@media (max-width:640px){th:nth-child(2),td:nth-child(2){display:none}}.stack{flex-direction:column;gap:16px;display:flex}.field{border:0;flex-direction:column;gap:6px;margin:0;padding:0;font-size:14px;display:flex}.field input,.field select,.field textarea{max-width:480px}textarea,select{border:1px solid var(--line);color:inherit;font:inherit;background:0 0;border-radius:8px;padding:8px 10px}.inline{align-items:center;gap:8px;display:flex}.row.between{justify-content:space-between;align-items:center}.button{border:1px solid var(--line);border-radius:8px;padding:8px 14px;text-decoration:none;display:inline-block}.st-app a.button.primary,.button.primary{background:var(--accent);color:var(--st-on-primary);border-color:var(--accent)}.badge{border:1px solid var(--line);border-radius:999px;padding:2px 8px;font-size:12px}.badge.ok{background:#16a34a22;border-color:#16a34a}.panel{border:1px solid var(--line);border-radius:12px;margin:16px 0;padding:16px}.panel.issue{border-color:var(--error)}.list{margin:6px 0 0;padding-left:20px}.danger{color:var(--error);border-color:var(--error)}.lesson{border:1px solid var(--line);border-radius:12px;margin:14px 0;padding:14px}.lesson-head{flex-wrap:wrap;align-items:flex-end;gap:8px;display:flex}.lesson-head label{flex-direction:column;gap:4px;font-size:13px;display:flex}.part-row{border-top:1px dashed var(--line);flex-wrap:wrap;align-items:center;gap:8px;padding:8px 0;display:flex}.part-row input[type=text]{flex:1;min-width:160px}.tag{color:var(--muted);font-size:12px}.editor{border:1px solid var(--line);border-radius:8px;max-width:720px}.editor .toolbar{border-bottom:1px solid var(--line);flex-wrap:wrap;gap:4px;padding:6px;display:flex}.tool{padding:4px 8px;font-size:13px}.tool.on{background:var(--accent);color:var(--st-on-primary)}.editor-body{outline:none;min-height:140px;padding:10px 12px}.editor-body p{margin:0 0 8px}.panel{border:1px solid var(--line);border-radius:8px;margin-top:8px;padding:12px}.thumbs{flex-wrap:wrap;gap:10px;margin:12px 0;display:flex}.thumb{border:1px solid var(--line);cursor:zoom-in;background:0 0;border-radius:8px;padding:0;overflow:hidden}.thumb img{max-width:360px;max-height:260px;display:block}.submission-text{white-space:pre-wrap;max-width:720px}.lightbox{z-index:50;color:#fff;background:#000000eb;flex-direction:column;display:flex;position:fixed;inset:0}.lightbox-bar{align-items:center;gap:8px;padding:10px 14px;display:flex}.lightbox-stage{flex:1;justify-content:center;align-items:center;min-height:0;display:flex;overflow:auto}.lightbox-stage img{cursor:zoom-in;max-width:100%;max-height:100%}.lightbox-stage.zoomed{display:block}.lightbox-stage.zoomed img{cursor:zoom-out;max-width:none;max-height:none}.feedback-panel{border-top:1px solid var(--line);max-width:720px;margin-top:24px;padding-top:8px}.feedback-panel .stack{flex-direction:column;gap:8px;display:flex}.rec-live{color:#c0392b}.chat{background:var(--st-bg);border:1px solid var(--st-line);border-radius:var(--st-radius);flex-direction:column;gap:10px;min-height:120px;max-height:60vh;margin:12px 0;padding:12px;display:flex;overflow-y:auto}.chat-row{display:flex}.chat-row.me{justify-content:flex-end}.chat-row.them{justify-content:flex-start}.chat-bubble{border-radius:var(--st-radius);background:var(--st-surface);border:1px solid var(--st-line);max-width:min(640px,90%);padding:8px 10px}.chat-row.me .chat-bubble{background:var(--st-brand-50);border-color:#0000}.chat-meta{text-align:right;margin:4px 0 0}.admin-chat{flex-direction:column;height:calc(100dvh - 120px);min-height:420px;display:flex}.admin-chat .chat{border-bottom-right-radius:0;border-bottom-left-radius:0;flex:1;max-height:none;margin:8px 0 0}.chat-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:4px;margin:4px 0;display:grid}.chat-grid.one{grid-template-columns:minmax(0,1fr)}.chat-day{text-align:center;margin:6px 0}.chat-day span{color:var(--st-text-muted);background:var(--st-surface-2);border-radius:999px;padding:2px 10px;font-size:12px}.chat-dot{background:var(--st-accent);border-radius:50%;width:8px;height:8px;margin-left:6px;display:inline-block}.chat-composer{border:1px solid var(--st-line);border-radius:0 0 var(--st-radius) var(--st-radius);background:var(--st-surface);border-top:0;padding:8px 10px}.chat-strip{gap:8px;padding-bottom:8px;display:flex;overflow-x:auto}.chat-strip-item{border:1px solid var(--st-line);border-radius:8px;flex:none;width:72px;height:72px;position:relative;overflow:hidden}.chat-strip-item img{object-fit:cover;width:100%;height:100%}.chat-strip-x{color:#fff;background:#0009;border:0;border-radius:50%;width:22px;height:22px;padding:0;line-height:1;position:absolute;top:2px;right:2px}.chat-strip-progress{text-align:center;color:#fff;background:#0000008c;font-size:11px;position:absolute;inset:auto 0 0}.chat-inputbar{align-items:flex-end;gap:8px;display:flex}.chat-inputbar textarea{resize:none;border:1px solid var(--st-line-strong);background:var(--st-surface);border-radius:20px;flex:1;max-height:140px;padding:9px 14px;line-height:1.35}.chat-icon-btn,.chat-send{border-radius:20px;flex:none;height:40px;padding:0 14px}.chat-icon-btn{width:40px;padding:0;font-size:18px}.chat-send{background:var(--st-primary);color:#fff;border:0;font-weight:600}.chat-spinner{border:2px solid #7f7f7f59;border-top-color:var(--st-primary);border-radius:50%;flex:none;align-self:center;width:18px;height:18px;animation:.8s linear infinite chat-spin}@keyframes chat-spin{to{transform:rotate(360deg)}}.chat-send:disabled{opacity:.45}.a-fail{background:#ffffffeb;flex-direction:column;padding:2px;font-size:10px;display:flex;position:absolute;inset:0}.completions{margin:4px 0}@media (max-width:700px){.admin-chat{height:calc(100dvh - 100px)}}.admin-topbar{padding-top:var(--st-2);padding-bottom:var(--st-2);flex-wrap:wrap;row-gap:0}.admin-brand-tag{color:#e6f1f7;font-size:var(--st-fs-sm);letter-spacing:.04em;font-weight:700}.admin-me{color:#e6f1f7;font-size:var(--st-fs-sm)}.admin-logout{padding:var(--st-1) var(--st-3);border-radius:var(--st-radius-sm);color:#fff;font-weight:600;font-size:var(--st-fs-sm);background:0 0;border:1px solid #ffffff73}.admin-logout:hover{background:#ffffff1f}