.stu-appbar{display:flex;align-items:center;gap:16px;padding:10px 18px;border-bottom:1px solid var(--hair);background:#faf8f6;position:-webkit-sticky;position:sticky;top:0;z-index:5}.stu-appbar nav{display:flex;gap:14px;font-size:13px;flex-wrap:wrap}.stu-appbar nav a{text-decoration:none}.stu-appbar nav a:hover{text-decoration:underline}.stu-appbar .grow{flex:1 1}.stu-appbar .title{font-weight:700;font-size:19px}.stu-appbar .logo{border:1px dashed var(--muted);color:var(--muted);font-size:11.5px;padding:6px 10px;border-radius:4px;white-space:nowrap;text-decoration:none}.pad{padding:18px clamp(14px,3vw,30px) 40px}.center{margin:0 auto}.center,.ttl{text-align:center}.ttl{font-size:24px;font-weight:700;margin:18px 0 4px}.sub{text-align:center;color:var(--muted);font-size:14px;margin:0 0 10px}.lnk{color:var(--accent);text-decoration:underline;cursor:pointer}.card{background:#fff;border:1px solid var(--hair);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px 16px;margin:12px auto}.card h4{margin:0 0 8px}.wiz-steps{display:flex;gap:6px;justify-content:center;margin:20px 0 6px}.wiz-steps i{width:26px;height:5px;border-radius:3px;background:var(--hair)}.wiz-steps i.on{background:var(--accent)}.choice{display:inline-block;border:1px solid var(--hair);border-radius:20px;padding:8px 18px;margin:4px;cursor:pointer;background:#fff;font-size:14px;-webkit-user-select:none;-moz-user-select:none;user-select:none}.choice.on{background:var(--accent);color:#fff;border-color:var(--accent)}.checks{text-align:start;background:#fff;border:1px solid var(--hair);border-radius:var(--radius);padding:12px 16px;margin:12px 0}.checks label{display:flex;gap:8px;align-items:center;padding:4px 0;font-size:14px}.note-ex{display:inline-block;border:1px dashed var(--muted);color:var(--muted);border-radius:6px;padding:8px 14px;font-size:12.5px;margin:8px auto}.dash-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.dash-head h2{margin:0;font-size:20px}.dash-head select{padding:6px 10px;border:1px solid var(--hair);border-radius:7px;font:inherit;font-size:13px;background:#fff}.viewtog{-webkit-margin-start:auto;margin-inline-start:auto;display:flex;border:1px solid var(--hair);border-radius:8px;overflow:hidden}.viewtog button{border:none;background:#fff;padding:6px 16px;font:inherit;font-size:13px;cursor:pointer;color:inherit}.viewtog button.on{background:var(--ink);color:#fff}.map{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));grid-gap:12px;gap:12px;margin:14px 0}.stn{background:#fff;border:1px solid var(--hair);border-radius:10px;padding:12px;text-align:center;cursor:pointer;box-shadow:var(--shadow)}.stn:hover{border-color:var(--accent)}.stn .bubble{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--chip);margin-bottom:6px;font-size:14px}.stn b{display:block;font-size:13.5px}.stn small{color:var(--muted);font-size:11.5px}.stn.done .bubble{background:var(--ok-bg);color:var(--ok-ink)}.stn.part .bubble{background:var(--accent-bg);color:var(--accent)}.stn.locked{opacity:.5;cursor:default}.stn.locked:hover{border-color:var(--hair)}.legend{display:flex;gap:16px;flex-wrap:wrap;justify-content:center;font-size:12.5px;color:var(--muted);margin:8px 0 18px}table.list{width:100%;border-collapse:collapse;font-size:14px;background:#fff;border:1px solid var(--hair);border-radius:8px;overflow:hidden}table.list th{background:#f6f3ef;text-align:start;font-weight:600;font-size:12px;color:var(--muted);padding:8px 12px}table.list td,table.list th{border-bottom:1px solid var(--hair)}table.list td{padding:9px 12px}table.list tbody tr{cursor:pointer}table.list tbody tr:hover{background:var(--bg)}table.list tr.locked{color:var(--muted);cursor:default}table.list tr.locked:hover{background:#fff}.strip{display:flex;align-items:center;gap:14px;flex-wrap:wrap;background:var(--accent-bg);border:1px solid #cfe0dc;border-radius:10px;padding:12px 16px;margin-top:10px}.tool-layout{display:grid;grid-template-columns:1fr 250px;min-height:70vh}.tool-main{padding:18px clamp(14px,2.5vw,30px) 90px;-webkit-border-end:1px solid var(--hair);border-inline-end:1px solid var(--hair);min-width:0}.tool-side{background:#fbfaf8;padding:12px 0 90px;font-size:13.5px}.side-h{padding:12px 16px 4px;font-size:11px;letter-spacing:.05em;color:var(--muted);font-weight:600}.fitem{display:flex;gap:8px;align-items:center;padding:7px 16px;cursor:pointer;-webkit-border-start:3px solid transparent;border-inline-start:3px solid transparent}.fitem:hover{background:var(--bg)}.fitem.on{background:var(--accent-bg);border-inline-start-color:var(--accent);font-weight:600}.fitem .st{flex:none;width:18px;text-align:center;color:var(--muted)}.fitem .st.done{color:var(--ok-ink)}.prog{padding:10px 16px;border-bottom:1px solid var(--hair)}.prog b{font-size:13px}.prog .bar{height:7px;background:var(--hair);border-radius:4px;margin:6px 0 4px;overflow:hidden}.prog .bar i{display:block;height:100%;background:var(--accent);border-radius:4px;transition:width .25s}.fmt h3{text-align:center;font-size:20px;margin:6px 0 12px}.player{background:var(--ink);border-radius:10px;height:180px;display:grid;place-items:center;margin:12px auto;max-width:520px}.player .play{width:54px;height:54px;border-radius:50%;background:#fff;display:grid;place-items:center;font-size:20px;cursor:pointer}.model-box{position:relative;background:var(--chip);border-radius:10px;min-height:200px;display:grid;place-items:center;color:var(--muted);max-width:520px;margin:12px auto}.hotspot{position:absolute;width:26px;height:26px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:13px;cursor:pointer}.exbox{background:#fff;border:1px solid var(--hair);border-radius:8px;padding:10px 14px;margin:8px 0;font-size:14px}.exbox b{display:block;margin-bottom:4px}.acc{border:1px solid var(--hair);border-radius:8px;margin:6px 0;background:#fff}.acc summary{padding:9px 14px;cursor:pointer;font-weight:600;font-size:14px}.acc .inner{padding:0 14px 12px;font-size:13.5px}.hist{margin-top:16px}.hist h4{font-size:14px;margin:0 0 6px}.hist .row{display:flex;gap:8px;align-items:center;padding:6px 0;border-bottom:1px solid var(--hair);font-size:13.5px}.hist .st{color:var(--ok-ink)}.qopt{display:block;border:1px solid var(--hair);border-radius:8px;padding:9px 14px;margin:6px auto;max-width:420px;cursor:pointer;background:#fff;font-size:14px}.qopt.right{background:var(--ok-bg);border-color:var(--ok)}.qopt.wrong{background:var(--warn-bg);border-color:var(--warn)}.scale{display:flex;gap:6px;flex-wrap:wrap}.scale span{border:1px solid var(--hair);border-radius:16px;padding:5px 14px;cursor:pointer;font-size:13px;background:#fff;-webkit-user-select:none;-moz-user-select:none;user-select:none}.scale span.on{background:var(--accent);color:#fff;border-color:var(--accent)}.tabs{display:flex;gap:6px;justify-content:center;margin:10px 0}.tabs button{border:1px solid var(--hair);background:#fff;border-radius:16px;padding:5px 16px;font:inherit;font-size:13px;cursor:pointer;color:inherit}.tabs button.on{background:var(--ink);color:#fff;border-color:var(--ink)}.floatbar{position:fixed;bottom:0;inset-inline:0;display:flex;align-items:center;gap:10px;padding:8px 16px;background:#fff;border-top:1px solid var(--hair);box-shadow:0 -2px 8px rgba(30,26,22,.06);z-index:10;flex-wrap:wrap}.floatbar .pts{font-weight:700;color:var(--accent)}.fchip{border:1px solid var(--hair);border-radius:16px;padding:5px 13px;font-size:13px;cursor:pointer;background:#fff;text-decoration:none;white-space:nowrap}.fchip:hover{background:var(--chip)}.chat{max-width:640px;margin:0 auto}.chat-head{display:flex;gap:10px;align-items:center;padding-bottom:10px;border-bottom:1px solid var(--hair)}.ava{width:40px;height:40px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:14px;font-weight:700}.msgs{display:flex;flex-direction:column;gap:8px;padding:14px 0}.msg{max-width:78%;border-radius:12px;padding:8px 12px;font-size:14px;position:relative}.msg small{display:block;font-size:10.5px;color:var(--muted);margin-top:3px;text-align:end}.msg.them{background:#fff;border:1px solid var(--hair);align-self:flex-start}.msg.me{background:var(--accent-bg);border:1px solid #cfe0dc;align-self:flex-end}.msg .rep{-webkit-border-start:3px solid var(--accent);border-inline-start:3px solid var(--accent);background:rgba(44,93,88,.07);border-radius:6px;padding:4px 8px;font-size:12px;margin-bottom:5px}.msg .rep,.unread{color:var(--muted)}.unread{text-align:center;font-size:11.5px;background:var(--chip);border-radius:10px;padding:2px 10px;align-self:center}.chat-in{display:flex;gap:8px;align-items:flex-end}.chat-in textarea{flex:1 1;min-height:44px;padding:9px 12px;border:1px solid var(--hair);border-radius:8px;font:inherit;resize:vertical}.sos-g{margin:18px 0}.sos-g h4{font-size:15px;margin:0 0 8px}.sos-r{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));grid-gap:10px;gap:10px}.sos{background:#fff;border:1px solid var(--hair);border-radius:10px;padding:12px;display:flex;flex-direction:column;gap:8px;align-items:center;text-align:center}.sos small{color:var(--muted);font-size:12.5px}.sos.locked{opacity:.5}@media (max-width:860px){.tool-layout{grid-template-columns:1fr}.tool-main{-webkit-border-end:none;border-inline-end:none}.tool-side{border-top:1px solid var(--hair)}}