:root{--ink: #1b1b1f;--ink-2: #4a4a55;--ink-3: #8e8e9a;--bg: #faf9f7;--panel: #ffffff;--line: #e8e6e1;--brand: #6965db;--brand-ink: #4f4bc4;--orange: #f0873a;--green: #1c9d6e;--blue: #2f7ee5;--red: #e03131;--shadow: 0 10px 34px rgba(30, 27, 62, .14);--radius: 14px}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Segoe UI,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}button{font-family:inherit}.welcome-wrap{min-height:100%;display:flex;flex-direction:column;align-items:center;background:radial-gradient(1100px 500px at 15% -10%,#ede9ff 0%,transparent 60%),radial-gradient(900px 460px at 95% 0%,#fff2e2 0%,transparent 55%),var(--bg);padding:32px 20px 60px}.welcome-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px}.welcome-brand-badge{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#6965db,#9d8bff);color:#fff;display:grid;place-items:center;font-size:18px}.welcome-brand small{color:var(--ink-3);font-weight:500;margin-left:2px}.welcome-hero{text-align:center;margin-top:52px;max-width:680px}.welcome-hero h1{font-size:clamp(28px,4.4vw,42px);letter-spacing:.5px;margin:0 0 14px}.welcome-hero h1 .hl-o{color:var(--orange)}.welcome-hero h1 .hl-g{color:var(--green)}.welcome-hero p{color:var(--ink-2);font-size:16px;margin:0;line-height:1.7}.welcome-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:30px}.btn{border:1px solid transparent;border-radius:12px;padding:12px 26px;font-size:16px;font-weight:600;cursor:pointer;transition:transform .08s ease,box-shadow .15s ease,background .15s}.btn:active{transform:translateY(1px) scale(.99)}.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px #6965db59}.btn-primary:hover{background:var(--brand-ink)}.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line);box-shadow:0 2px 8px #0000000a}.btn-ghost:hover{border-color:#c9c5f0;color:var(--brand-ink)}.btn-sm{padding:7px 14px;font-size:13px;border-radius:9px}.btn-danger{background:#fff5f5;color:var(--red);border-color:#ffd7d7}.btn-danger:hover{background:#ffe8e8}.btn:disabled{opacity:.5;cursor:not-allowed}.welcome-steps{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:34px}.welcome-step{background:#fffc;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px;display:flex;align-items:center;gap:12px;min-width:210px}.welcome-step-num{width:30px;height:30px;flex:none;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:15px}.welcome-step:nth-child(1) .welcome-step-num{background:#f3efff;color:var(--brand-ink)}.welcome-step:nth-child(2) .welcome-step-num{background:#fff1e4;color:var(--orange)}.welcome-step:nth-child(3) .welcome-step-num{background:#e7f7f0;color:var(--green)}.welcome-step b{display:block;font-size:14px}.welcome-step span{color:var(--ink-3);font-size:12px}.welcome-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px;width:100%;max-width:860px;margin-top:44px}.welcome-feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px}.welcome-feature .fi{font-size:26px}.welcome-feature b{display:block;margin:8px 0 4px;font-size:15px}.welcome-feature span{color:var(--ink-3);font-size:13px;line-height:1.6}.welcome-rooms{width:100%;max-width:860px;margin-top:34px}.welcome-rooms h3{font-size:17px;margin:0 0 12px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}.rooms-hint{font-size:12px;font-weight:500;color:var(--ink-3);background:#f2f0fb;border-radius:999px;padding:3px 10px}.rooms-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}.room-card{background:#fff;border:1.5px solid var(--line);border-radius:14px;padding:16px 18px;cursor:pointer;transition:border-color .15s,box-shadow .15s,transform .1s;text-align:left;position:relative}.room-card:hover{border-color:#a8a2e8;box-shadow:0 8px 22px #6965db24;transform:translateY(-1px)}.room-card b{font-size:16px;display:block;margin-bottom:8px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.room-card-meta{color:var(--ink-3);font-size:12px;display:flex;gap:10px;flex-wrap:wrap;align-items:center}.room-card-meta .live{color:var(--green);font-weight:700;display:inline-flex;align-items:center;gap:5px}.live-dot{width:7px;height:7px;border-radius:50%;background:var(--green);display:inline-block;animation:pulse 1.6s infinite}@keyframes pulse{0%{box-shadow:0 0 #1c9d6e73}70%{box-shadow:0 0 0 6px #1c9d6e00}to{box-shadow:0 0 #1c9d6e00}}.room-card-join{display:inline-block;margin-top:12px;font-size:13px;font-weight:700;color:var(--brand-ink)}.room-card:hover .room-card-join{text-decoration:underline}.rooms-refresh{margin-top:10px;font-size:12px;color:var(--ink-3);text-align:center}.rooms-empty{color:var(--ink-3);font-size:14px;background:#fff;border:1px dashed var(--line);border-radius:12px;padding:22px;text-align:center}.welcome-foot{margin-top:46px;color:var(--ink-3);font-size:12px;text-align:center;line-height:1.8}.modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;z-index:60;background:#1412286b;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);display:grid;place-items:center;padding:18px;animation:fadeIn .14s ease}@keyframes fadeIn{0%{opacity:0}}.modal{background:var(--panel);border-radius:18px;box-shadow:var(--shadow);width:100%;max-width:430px;padding:26px;animation:popIn .18s cubic-bezier(.2,1.2,.4,1);max-height:90vh;overflow:auto}@keyframes popIn{0%{opacity:0;transform:scale(.94) translateY(8px)}}.modal h2{margin:0 0 4px;font-size:19px}.modal .sub{color:var(--ink-3);font-size:13px;margin-bottom:18px;line-height:1.6}.field{margin-bottom:14px}.field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--ink-2)}.field input{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:10px 12px;font-size:15px;outline:none;transition:border-color .15s;background:#fff;color:var(--ink)}.field input:focus{border-color:var(--brand)}.field .hint{font-size:12px;color:var(--ink-3);margin-top:5px;line-height:1.5}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:20px}.form-error{color:var(--red);font-size:13px;margin-top:4px;min-height:18px}.link-btn{background:none;border:none;color:var(--brand-ink);font-size:13px;cursor:pointer;padding:0}.link-btn:hover{text-decoration:underline}.room-root{display:flex;flex-direction:column;height:100%;overflow:hidden}.room-topbar{flex:none;height:52px;display:flex;align-items:center;gap:10px;padding:0 12px;background:var(--panel);border-bottom:1px solid var(--line);z-index:30}.room-title{font-weight:700;font-size:15px;display:flex;align-items:center;gap:8px;min-width:0}.room-title .name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:260px}.role-chip{font-size:11px;font-weight:700;padding:2px 8px;border-radius:999px;flex:none}.role-chip.teacher{background:#fff1e4;color:#c05f17}.role-chip.student{background:#e8f1fd;color:var(--blue)}.role-chip.ro{background:#f2f2f5;color:var(--ink-3)}.conn-dot{width:8px;height:8px;border-radius:50%;flex:none}.conn-dot.on{background:var(--green)}.conn-dot.off{background:var(--red);animation:blink 1s infinite}@keyframes blink{50%{opacity:.3}}.topbar-spacer{flex:1}.topbar-members{display:flex;align-items:center}.member-avatar{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;color:#fff;font-size:12px;font-weight:700;border:2px solid #fff;margin-left:-7px;position:relative}.member-avatar .hand{position:absolute;top:-8px;right:-6px;font-size:12px}.icon-btn{border:1px solid var(--line);background:#fff;border-radius:10px;height:34px;padding:0 12px;font-size:13px;font-weight:600;color:var(--ink-2);cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:border-color .15s,color .15s,background .15s;flex:none;white-space:nowrap}.icon-btn:hover{border-color:#c9c5f0;color:var(--brand-ink)}.icon-btn.active{background:#f3efff;border-color:#c9c5f0;color:var(--brand-ink)}.icon-btn.warn:hover{border-color:#ffb3b3;color:var(--red)}.icon-btn:disabled{opacity:.45;cursor:not-allowed}.room-body{flex:1;display:flex;min-height:0;position:relative}.pages-panel{width:178px;flex:none;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:20}.pages-head{padding:10px 12px 8px;font-size:12px;font-weight:700;color:var(--ink-3);display:flex;align-items:center;justify-content:space-between}.pages-head button{border:none;background:#f2f0fb;color:var(--brand-ink);border-radius:7px;font-size:12px;font-weight:700;padding:3px 8px;cursor:pointer}.pages-list{flex:1;overflow-y:auto;padding:0 10px 10px}.page-item{border:2px solid transparent;border-radius:10px;padding:6px;margin-bottom:8px;cursor:pointer;position:relative;background:#fafafb;transition:border-color .12s,background .12s}.page-item:hover{background:#f1effc}.page-item.current{border-color:var(--brand);background:#f3efff}.page-thumb{height:92px;border-radius:7px;background:#fff;border:1px solid var(--line);display:grid;place-items:center;overflow:hidden}.page-thumb img{width:100%;height:100%;object-fit:cover}.page-thumb .blank-ico{color:var(--ink-3);font-size:20px}.page-label{font-size:12px;margin-top:5px;display:flex;align-items:center;justify-content:space-between;gap:4px;color:var(--ink-2)}.page-label .nm{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.page-label .pg-del{border:none;background:none;color:var(--ink-3);cursor:pointer;font-size:12px;padding:0 2px;border-radius:4px;flex:none;opacity:0}.page-item:hover .pg-del{opacity:1}.page-label .pg-del:hover{color:var(--red);background:#fdecec}.pages-foot{padding:8px 12px;border-top:1px solid var(--line)}.pages-foot button{width:100%;border:1.5px dashed #cfcbe8;background:none;color:var(--brand-ink);border-radius:9px;padding:7px;font-size:13px;font-weight:600;cursor:pointer}.pages-foot button:hover{background:#f3efff}.canvas-wrap{flex:1;min-width:0;position:relative}.excalidraw-host{width:100%;height:100%}.excal-loading{display:flex;align-items:center;justify-content:center;width:100%;height:100%;min-height:260px;color:#6b7280;font-size:14px;background:#fff}.readonly-banner{position:absolute;top:10px;left:50%;transform:translate(-50%);z-index:20;background:#1b1b1fd1;color:#fff;border-radius:999px;padding:7px 16px;font-size:13px;display:flex;align-items:center;gap:8px;pointer-events:none;box-shadow:0 6px 20px #00000040}.readonly-banner .dot{width:7px;height:7px;border-radius:50%;background:#ffc24b;animation:blink 1.4s infinite}.side-panel{width:296px;flex:none;background:var(--panel);border-left:1px solid var(--line);display:flex;flex-direction:column;z-index:20;min-height:0}.panel-tabs{display:flex;border-bottom:1px solid var(--line);flex:none}.panel-tab{flex:1;padding:10px 4px;text-align:center;font-size:13px;font-weight:600;color:var(--ink-3);border:none;background:none;cursor:pointer;border-bottom:2.5px solid transparent;position:relative}.panel-tab.active{color:var(--brand-ink);border-bottom-color:var(--brand)}.panel-tab .badge{position:absolute;top:5px;margin-left:4px;background:var(--red);color:#fff;min-width:16px;height:16px;border-radius:999px;font-size:10px;display:grid;place-items:center;padding:0 4px}.panel-body{flex:1;overflow-y:auto;min-height:0}.member-row{display:flex;align-items:center;gap:10px;padding:10px 12px;border-bottom:1px solid #f2f1ee}.member-row .avatar{width:34px;height:34px;border-radius:50%;color:#fff;display:grid;place-items:center;font-size:13px;font-weight:700;flex:none}.member-row .info{flex:1;min-width:0}.member-row .info b{font-size:13px;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.member-row .info span{font-size:11px;color:var(--ink-3)}.member-row .ops{display:flex;gap:6px;align-items:center;flex:none}.watch-btn{width:27px;height:27px;flex:none;border:1.5px solid var(--line);background:#fff;color:var(--ink-3);border-radius:8px;cursor:pointer;font-size:12px;display:grid;place-items:center;padding:0;font-family:inherit;transition:all .12s}.watch-btn:hover{border-color:#c9c5f0;color:var(--brand-ink)}.watch-btn.on{background:#f3efff;border-color:#c9c5f0;color:var(--brand-ink)}.grant-toggle{width:38px;height:22px;border-radius:999px;background:#ddd;border:none;cursor:pointer;position:relative;transition:background .15s;padding:0;flex:none}.grant-toggle:after{content:"";position:absolute;top:2.5px;left:3px;width:17px;height:17px;border-radius:50%;background:#fff;transition:left .15s;box-shadow:0 1px 3px #00000040}.grant-toggle.on{background:var(--green)}.grant-toggle.on:after{left:18px}.panel-section{padding:12px;border-bottom:1px solid #f2f1ee}.panel-section h4{margin:0 0 8px;font-size:12px;color:var(--ink-3)}.perm-row{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:6px 0}.perm-row b{font-size:13px}.perm-row .desc{font-size:11px;color:var(--ink-3);display:block}.chat-list{display:flex;flex-direction:column;padding:8px 0}.chat-msg{padding:6px 14px;font-size:13px;line-height:1.55}.chat-msg .who{font-weight:700;margin-right:6px}.chat-msg .who.teacher{color:#c05f17}.chat-msg .who.student{color:var(--blue)}.chat-msg .txt{color:var(--ink-2);word-break:break-word}.chat-msg .ts{color:#c5c4cf;font-size:10px;margin-left:6px}.chat-msg.self .txt{color:var(--ink)}.chat-empty{text-align:center;color:var(--ink-3);font-size:12px;padding:30px 10px}.chat-input-bar{flex:none;border-top:1px solid var(--line);padding:10px;display:flex;gap:8px}.chat-input-bar input{flex:1;border:1.5px solid var(--line);border-radius:10px;padding:8px 11px;font-size:13px;outline:none;min-width:0}.chat-input-bar input:focus{border-color:var(--brand)}.chat-input-bar input.chat-locked{background:#f6f5f4;color:var(--ink-3);cursor:not-allowed}.timer-pill2{position:absolute;top:12px;right:14px;z-index:20;background:#ffffffeb;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(30,27,62,.08);border-radius:16px;padding:8px 12px;display:flex;align-items:center;gap:9px;font-variant-numeric:tabular-nums;box-shadow:0 6px 20px #1e1b3e1f}.timer-pill2.warn{border-color:#e031314d}.tp-icon{font-size:15px}.tp-label{font-size:13px;font-weight:700;color:var(--ink-2)}.tp-hint{font-size:11px;color:var(--ink-3)}.tp-trigger{display:flex;align-items:center;gap:6px;border:none;background:transparent;padding:0;cursor:pointer;font:inherit}.tp-trigger:hover .tp-label{color:var(--brand-ink)}.tp-caret{font-size:10px;color:var(--ink-3);margin-left:2px}.timer-pill2.idle{cursor:default}.tp-presets{display:flex;gap:5px}.tp-presets button{border:1px solid var(--line);background:#fff;color:var(--ink-2);border-radius:8px;font-size:12px;font-weight:700;padding:4px 8px;cursor:pointer;transition:all .12s}.tp-presets button:hover{border-color:var(--brand);color:var(--brand-ink);background:#f6f4ff}.tp-ring{width:34px;height:34px;transform:rotate(-90deg);flex:none}.tp-ring .bg{fill:none;stroke:#eceaf6;stroke-width:3.5}.tp-ring .fg{fill:none;stroke:var(--brand);stroke-width:3.5;stroke-linecap:round;transition:stroke-dashoffset .35s ease}.timer-pill2.warn .tp-ring .fg{stroke:var(--red)}.tp-time{font-size:17px;font-weight:800;letter-spacing:.5px;color:var(--ink)}.tp-time.warn{color:var(--red);animation:blink 1.2s infinite}.tp-ops{display:flex;gap:4px}.tp-ops button{border:none;background:#f2f1f6;color:var(--ink-2);width:26px;height:26px;border-radius:8px;cursor:pointer;font-size:11px}.tp-ops button:hover{background:#e8e6f2;color:var(--ink)}.follow-status{position:absolute;bottom:14px;left:50%;transform:translate(-50%);z-index:15;background:#1b1b1fc7;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);color:#fff;border-radius:999px;padding:6px 14px;font-size:12px;display:flex;align-items:center;gap:7px;pointer-events:none}.follow-status .fs-dot{width:7px;height:7px;border-radius:50%;background:#6ee7b7;animation:pulse 1.6s infinite}.canvas-wrap .audio-bar~.follow-status,.canvas-wrap:has(.audio-bar) .follow-status{bottom:78px}.watch-status{position:absolute;bottom:14px;left:50%;transform:translate(-50%);z-index:21;background:#fffffff2;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(105,101,219,.35);color:var(--ink-2);border-radius:999px;padding:5px 6px 5px 14px;font-size:12px;display:flex;align-items:center;gap:8px;box-shadow:0 6px 20px #1e1b3e1f}.watch-status b{color:var(--brand-ink)}.watch-status .ws-dot{width:7px;height:7px;border-radius:50%;background:#6965db;animation:pulse 1.6s infinite;flex:none}.watch-status button{border:none;background:#f3efff;color:var(--brand-ink);border-radius:999px;padding:4px 10px;font-size:12px;font-weight:700;cursor:pointer;font-family:inherit;flex:none}.watch-status button:hover{background:#e4dcff}.canvas-wrap .audio-bar~.watch-status,.canvas-wrap:has(.audio-bar) .watch-status{bottom:78px}.audio-bar{position:absolute;bottom:14px;left:50%;transform:translate(-50%);z-index:22;background:#fffffff0;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid rgba(30,27,62,.1);border-radius:16px;box-shadow:0 10px 28px #1e1b3e2e;padding:8px 12px;display:flex;align-items:center;gap:9px;max-width:min(720px,calc(100% - 28px))}.ab-btn{width:34px;height:34px;flex:none;border:none;border-radius:50%;background:var(--brand);color:#fff;font-size:13px;cursor:pointer;display:grid;place-items:center}.ab-btn:hover{background:var(--brand-ink)}.ab-btn.ab-close{background:#f2f1f6;color:var(--ink-3);font-size:12px}.ab-btn.ab-close:hover{background:#ffe8e8;color:var(--red)}.ab-name{font-size:13px;font-weight:700;max-width:130px;flex:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ab-unlock{border:none;background:#f0873a;color:#fff;border-radius:999px;padding:6px 12px;font-size:12px;font-weight:700;cursor:pointer;flex:none;animation:pulse 1.6s infinite}.ab-track{flex:1;min-width:80px;height:22px;position:relative;background:#eef0f4;border-radius:999px;overflow:hidden}.ab-progress{position:absolute;inset:0 auto 0 0;width:0%;background:linear-gradient(90deg,#9d8bff,#6965db);border-radius:999px}.ab-seek{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;opacity:0;cursor:pointer;margin:0}.ab-time{font-size:11px;color:var(--ink-3);font-variant-numeric:tabular-nums;flex:none}.ab-vol{width:66px;flex:none;accent-color:var(--brand)}.page-check{display:flex;align-items:center;gap:6px;min-width:0}.page-check .cbx{width:16px;height:16px;flex:none;border:2px solid #c5c3d5;border-radius:5px;background:#fff;display:inline-block;position:relative;transition:all .12s}.page-check .cbx.on{background:var(--brand);border-color:var(--brand)}.page-check .cbx.on:after{content:"✓";position:absolute;top:0;right:0;bottom:0;left:0;color:#fff;font-size:11px;font-weight:800;display:grid;place-items:center}.pages-foot.batch{font-size:12px;font-weight:700;color:var(--ink-2)}.pages-foot .mini{flex:1;border:1.5px solid var(--line);background:#fff;color:var(--ink-2);border-radius:8px;font-size:12px;font-weight:700;padding:6px 0;cursor:pointer}.pages-foot .mini:hover{border-color:#c9c5f0;color:var(--brand-ink)}.pages-foot .mini.danger{color:var(--red);border-color:#ffd7d7;background:#fff5f5}.pages-foot .mini.danger:hover{background:#ffe8e8}.pages-foot .mini:disabled{opacity:.45;cursor:not-allowed}.mini{border:1.5px solid var(--line);background:#fff;color:var(--ink-2);border-radius:8px;font-size:12px;font-weight:700;padding:5px 10px;cursor:pointer;font-family:inherit}.mini:hover{border-color:#c9c5f0;color:var(--brand-ink)}.mini.primary{background:var(--brand);border-color:var(--brand);color:#fff}.mini.primary:hover{background:var(--brand-ink);color:#fff}.mini:disabled{opacity:.45;cursor:not-allowed}.panel-section.hands{background:#fff8ef;border-bottom:1px solid #f5e3c8}.hand-item{display:flex;align-items:center;gap:8px;padding:7px 0}.hand-item .hand-txt{flex:1;min-width:0;font-size:13px;color:var(--ink-2);overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.hand-item b{color:#c05f17;margin-right:4px}.hand-q{display:block;font-size:11px;color:#c05f17;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ink-chip{width:16px;height:16px;border-radius:5px;flex:none;box-shadow:inset 0 0 0 1px #00000014}.toast-wrap{position:fixed;top:64px;left:50%;transform:translate(-50%);z-index:100;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none}.toast{background:#1b1b1f;color:#fff;border-radius:12px;padding:10px 18px;font-size:14px;box-shadow:0 10px 28px #0000004d;animation:toastIn .2s ease;max-width:80vw}.toast.warn{background:#7c2d12}@keyframes toastIn{0%{opacity:0;transform:translateY(-8px)}}.import-progress{position:absolute;bottom:18px;left:50%;transform:translate(-50%);z-index:25;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:12px 18px;min-width:280px}.import-progress .row{display:flex;justify-content:space-between;font-size:13px;margin-bottom:8px}.import-progress .bar{height:6px;border-radius:999px;background:#eee;overflow:hidden}.import-progress .bar i{display:block;height:100%;background:var(--brand);border-radius:999px;transition:width .2s}.join-modal-brand{text-align:center;margin-bottom:14px}.join-modal-brand .big{font-size:40px}.join-modal-brand h2{margin:6px 0 2px}.link-chip{display:flex;align-items:center;gap:8px;background:#f6f5fa;border:1px solid var(--line);border-radius:10px;padding:8px 10px;font-size:12px;color:var(--ink-2);word-break:break-all}.room-del{position:absolute;top:8px;right:8px;border:none;background:#ffffffe6;color:var(--ink-3);width:24px;height:24px;border-radius:7px;font-size:12px;cursor:pointer;opacity:0;transition:all .12s}.room-card:hover .room-del{opacity:1}.room-del:hover{background:#ffe8e8;color:var(--red)}@media (max-width: 900px){.pages-panel{width:132px}.side-panel{position:absolute;right:0;top:0;bottom:0;box-shadow:var(--shadow)}}.room-root.mock-mode .pages-panel{display:none}.room-root.mock-mode .room-topbar{background:#f8f9fc}.room-root.mock-mode .canvas-wrap{padding-bottom:52px}.mock-chip{background:#fdeef0;color:#c4385a;border:1px solid #f0c6d0;border-radius:999px;padding:2px 10px;font-size:12px;font-weight:600;margin-left:8px}.mock-navbar{position:absolute;left:0;right:0;bottom:0;height:52px;z-index:30;display:flex;align-items:center;gap:10px;padding:0 18px;background:#fff;border-top:1px solid var(--line);overflow-x:auto;white-space:nowrap}.mock-navbar .mnav-pages{display:flex;align-items:center;gap:8px;overflow-x:auto}.mock-navbar .mnav-label{font-size:12.5px;color:var(--ink-3);margin-right:6px;flex:none}.mock-navbar .mnav-page{min-width:30px;height:30px;border-radius:8px;border:1.5px solid var(--line);background:#fff;color:var(--ink-2);font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center;cursor:pointer;padding:0 8px}.mock-navbar .mnav-page:hover{border-color:var(--brand);color:var(--brand)}.mock-navbar .mnav-page.current{background:var(--brand);border-color:var(--brand);color:#fff}.mock-navbar .mnav-spacer{flex:1}.mock-navbar .icon-btn{font-size:12.5px}.ielts-dialog .modal{max-width:720px}.ielts-dialog textarea{width:100%;min-height:300px;resize:vertical;font:14px/1.7 ui-monospace,Menlo,Consolas,monospace;border:1px solid var(--line);border-radius:10px;padding:10px 12px;box-sizing:border-box}.ielts-dialog .hint{font-size:12.5px;color:var(--ink-3);line-height:1.7}.mock-tag{display:inline-block;margin-left:6px;vertical-align:1px;background:#fdeef0;color:#c4385a;border:1px solid #f0c6d0;font-size:10.5px;font-weight:700;border-radius:6px;padding:0 6px;line-height:1.7}.mock-exam-root,.mock-score-view,.mock-waiting{position:fixed;top:0;right:0;bottom:0;left:0;z-index:500;background:#e8eaed;display:flex;flex-direction:column;font-family:Arial,Helvetica,PingFang SC,sans-serif}.mock-top{height:54px;background:#fff;border-bottom:1px solid #c9cdd4;display:flex;align-items:center;padding:0 22px;gap:14px;flex-shrink:0}.mock-top .mtitle{font-weight:700;font-size:15px;color:#1a1a1a;letter-spacing:.5px}.mock-top .msub{font-size:12.5px;color:#5f6368}.mock-top .spacer{flex:1}.mock-body{flex:1;display:flex;min-height:0}.mock-left{flex:1.12;background:#fff;overflow-y:auto;padding:30px 34px;border-right:1px solid #dadce0;font-size:14px}.mock-right{flex:1;background:#fff;overflow-y:auto;padding:30px 34px}.mock-timer{font-family:Arial,monospace;font-size:20px;font-weight:700;color:#202124}.mock-timer.warn{color:#e37400}.mock-timer.danger{color:#d93025;animation:mkflash 1s infinite}@keyframes mkflash{0%,to{opacity:1}50%{opacity:.3}}.mock-btn{font-family:inherit;font-size:13px;border:1px solid #c9cdd4;background:#fff;color:#1a73e8;border-radius:4px;padding:6px 16px;cursor:pointer}.mock-btn:hover{background:#f1f3f4}.mock-btn.primary{background:#1a73e8;border-color:#1a73e8;color:#fff}.mock-btn.primary:hover{background:#1557b0}.fontgrp{display:flex;border:1px solid #c9cdd4;border-radius:4px;overflow:hidden}.fontgrp button{font-family:inherit;border:0;background:#fff;color:#5f6368;padding:6px 10px;cursor:pointer}.fontgrp button:hover{background:#f1f3f4}.fontgrp .ptab{font-weight:600}.fontgrp .ptab.on{background:#1a73e8;color:#fff}.mk-passage-title{font-size:15px;font-weight:700;color:#202124;text-align:center;letter-spacing:.5px}.mk-ptitle-main{font-size:17px;font-weight:700;color:#202124;text-align:center;margin-bottom:4px}.mk-para{margin:0 0 15px;line-height:1.8;color:#202124;font-size:1em;text-align:justify}.mk-qgroup{margin-bottom:26px}.mk-qgroup .gtitle{font-weight:700;color:#202124;font-size:14px;margin-bottom:8px}.mk-qgroup .ginstr{font-size:13.5px;color:#3c4043;margin-bottom:14px;line-height:1.65;white-space:pre-line;border-bottom:1px solid #e8eaed;padding-bottom:14px}.mk-q{border-bottom:1px solid #f1f3f4;padding:14px 0 12px}.mk-q .stem{font-size:14px;line-height:1.7;color:#202124;margin-bottom:8px}.mk-q .stem .qno,.mk-score-item .qno{font-weight:700;color:#1a73e8;margin-right:6px}.mk-flag{float:right;font-size:11.5px;color:#9aa0a6;cursor:pointer;-webkit-user-select:none;user-select:none}.mk-opt{display:flex;gap:8px;align-items:flex-start;margin:5px 0;padding:5px 8px;border:1px solid transparent;border-radius:6px;cursor:default;font-size:13.5px;color:#202124}.mk-opt:hover{background:#f1f3f4}.mk-opt input{accent-color:#1a73e8;cursor:pointer;width:19px;height:19px;flex:0 0 auto;margin-top:1px}.mk-opt .okey{font-weight:700;color:#3c4043;margin-right:2px}.mk-opt.picked{background:#e8f0fe;border-color:#1a73e8}.mk-opt.picked .okey{color:#1a73e8}.mk-opt.picked:hover{background:#dbe7fb}.mk-opt.used{opacity:.55;cursor:not-allowed}.mk-opt.used span,.mk-opt.used .okey{text-decoration:line-through}.mk-opt.used:hover{background:transparent}.mk-opt.used input{cursor:not-allowed}.mk-examples{margin:2px 0 12px;padding:8px 12px;background:#f8f9fa;border-left:3px solid #9aa0a6;border-radius:4px}.mk-example{font-size:13.5px;color:#3c4043;line-height:1.7}.mk-example b{color:#1a73e8}.mk-input{font-family:inherit;font-size:13.5px;border:none;border-bottom:1.5px solid #5f6368;padding:4px 8px;width:72%;background:#fff}.mk-nav{height:58px;background:#1b3a6b;display:flex;align-items:center;padding:0 16px;gap:8px;flex-shrink:0;overflow-x:auto}.mk-nav .navlbl{color:#a8c0e8;font-size:11.5px;flex-shrink:0}.mk-cell{min-width:28px;height:28px;border-radius:3px;border:1px solid #4a6cad;background:#2a4f8f;color:#dce8fb;font-size:12px;display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;padding:0 4px}.mk-cell:hover{background:#3a63ac}.mk-cell.answered{background:#34a853;border-color:#34a853;color:#fff}.mk-cell.flagged{box-shadow:0 0 0 2px #fbbc04}.mk-bottom{height:44px;background:#fff;border-top:1px solid #c9cdd4;display:flex;align-items:center;justify-content:space-between;padding:0 20px;flex-shrink:0}.mk-bottom .hint{color:#5f6368;font-size:11.5px}.mock-score-view{background:#f2f4f8;align-items:center;overflow-y:auto}.mock-score-card{background:#fff;border-radius:14px;max-width:860px;width:94%;margin:40px auto;padding:28px 32px;box-shadow:0 10px 40px #0000001f}.mock-score-num{font-size:42px;font-weight:800;color:#1a73e8;margin:10px 0 4px}.mock-score-num span{font-size:15px;color:#5f6368;font-weight:400;margin-left:12px}.mock-score-list{margin:18px 0}.mk-score-item{display:flex;gap:8px;padding:10px 6px;border-bottom:1px solid #eef0f3;font-size:13.5px;line-height:1.6}.mk-score-item .stem{flex:1;color:#202124}.mk-score-item.ok .qno{color:#188038}.mk-score-item.no .qno{color:#d93025}.ms-fb{font-size:13px;color:#3c4043;margin-top:2px}.ms-fb .ok{color:#188038}.ms-fb .no{color:#d93025}.ms-fb .answer{color:#188038;font-weight:700}.ms-expl{margin-top:4px;color:#5f6368}.ms-expl summary{cursor:pointer;color:#1a73e8;font-size:12.5px}.ms-expl div{margin-top:4px;white-space:pre-wrap}.mock-score-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}.mock-waiting{align-items:center;justify-content:center;background:#f2f4f8}.mock-waiting h2{color:#202124;font-size:24px}.mock-waiting-meta{margin-top:14px;padding:10px 22px;background:#fff;border-radius:999px;color:#5f6368;font-size:14px;box-shadow:0 4px 16px #00000014}.mock-banner{padding:9px 22px;text-align:center;font-size:13.5px;font-weight:600;background:#fef3cd;color:#7a5b00;border-bottom:1px solid #f0e2a8;flex-shrink:0}.mock-banner.err{background:#fdeef0;color:#b3261e;border-bottom-color:#f2c7cc}.mock-waiting-actions{display:flex;gap:12px;margin-top:22px}.mock-waiting{text-align:center}.mock-waiting p{max-width:520px}.mock-waiting-actions .mock-btn{padding:9px 26px;font-size:14px}.mock-btn.urgent{background:#d93025;border-color:#d93025;color:#fff;animation:mkflash 1.2s infinite}.mock-hl{border-radius:2px;padding:0 1px;cursor:pointer}.mock-hl:hover{outline:1.5px solid #b34700}.mk-hl-btn{position:fixed;z-index:80;transform:translate(-50%);background:#1a73e8;color:#fff;border:none;border-radius:8px;padding:9px 16px;font-size:15px;font-weight:600;line-height:1;box-shadow:0 3px 12px #00000047;cursor:pointer;touch-action:manipulation}.mk-hl-btn:active{background:#1557b0}@media (pointer: coarse){.mock-left .mk-para,.mk-q .stem,.mk-q .stem-text,.mk-q .opt-text{-webkit-touch-callout:none}}::highlight(mkSel){background-color:#ffe14d;color:inherit}.mk-selbox{position:fixed;background:#ffe14d8c;pointer-events:none;z-index:70;border-radius:2px}.mk-dbg{position:fixed;left:8px;right:8px;bottom:6px;z-index:95;pointer-events:none;background:#000000bd;color:#8fe3ff;font-size:12px;line-height:1.5;padding:4px 8px;border-radius:6px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.mock-left .mk-para,.mk-q .stem,.mk-q .stem-text,.mk-q .opt-text{-webkit-touch-callout:none}.mk-score-item.skip .qno{color:#9aa0a6}.skip-tip{color:#9aa0a6;font-style:italic;font-size:12px}.mock-btn.danger-outline{color:#d93025;border-color:#d93025;background:#fff}.mock-btn.danger-outline:hover{background:#fdeef0}.mk-hl-hint{background:#fff8e1;border:1px solid #ffe082;color:#6d4c00;font-size:12px;line-height:1.7;padding:8px 12px;border-radius:8px;margin-bottom:14px}.mk-hl-hint strong{color:#8a5a00}.canvas-wrap{position:relative}.xdock{position:absolute;left:4px;top:74px;z-index:60;display:flex;flex-direction:column;gap:6px;pointer-events:none}.xdock button{pointer-events:auto;width:46px;height:46px;font-size:20px;border:1px solid #d4d8e0;border-radius:10px;background:#fffffff0;box-shadow:0 2px 8px #0000001f;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .08s,box-shadow .15s}.xdock button:hover{transform:translateY(-1px);box-shadow:0 4px 12px #0000002e}.xdock button:active{transform:scale(.94)}.xdock button.on{background:#2b5cff;border-color:#2b5cff;color:#fff;box-shadow:0 2px 10px #2b5cff66}.xdock button.err-on{background:#d93025;border-color:#d93025;color:#fff}.xdock .xsep{height:1px;background:#e2e5ec;margin:3px 8px}.xdock .xshort{width:46px;text-align:center;font-size:10px;color:#8b93a7;margin-top:-2px}.excalidraw .App-bottom-bar{align-items:flex-end!important;justify-content:flex-end!important}.excalidraw .App-bottom-bar>.Island{width:auto!important;max-width:min(430px,90vw)!important;min-width:auto!important;margin:0 10px 10px 0!important;opacity:.97;max-height:60vh;overflow-x:auto}.excalidraw .App-toolbar{width:auto!important}.excalidraw .App-toolbar-content{flex-wrap:nowrap!important}.excalidraw .App-toolbar--mobile{position:absolute!important;left:auto!important;right:12px!important;bottom:12px!important;top:auto!important;width:auto!important;max-width:340px!important;overflow-x:auto!important;box-shadow:0 3px 12px #0000002e!important;z-index:6!important}.excalidraw .App-toolbar--mobile .App-toolbar-content{justify-content:flex-start!important;gap:4px;flex-wrap:nowrap!important}.excalidraw .App-toolbar--mobile .App-toolbar-content .ToolIcon,.excalidraw .App-toolbar--mobile .App-toolbar-content [class*=ToolIcon]{margin:0 2px!important}.excalidraw-host .excalidraw .App-menu__left{transition:transform .18s ease;box-shadow:0 6px 24px #0000002e;z-index:9!important}.excalidraw-host:not(.elprops-open) .excalidraw .App-menu__left{transform:translate(calc(-100% + 14px))!important;opacity:.35}.excalidraw-host:not(.elprops-open) .excalidraw .App-menu__left:hover{transform:translate(0)!important;opacity:1}.xdock button.on.elp-on{background:#7b61ff;border-color:#7b61ff}.mock-top .personal-badge{background:#7b61ff;color:#fff;font-size:11.5px;font-weight:600;border-radius:999px;padding:2px 10px;margin-left:4px}.mock-score-table{display:flex;flex-direction:column;gap:5px;margin-top:4px}.mock-score-row{display:flex;align-items:center;gap:8px;padding:6px 8px;background:#f6f7fb;border-radius:8px;font-size:12.5px}.msr-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600;color:var(--ink-2)}.msr-last{color:var(--ink-2);font-variant-numeric:tabular-nums}.msr-count{background:#e9edf7;color:#42507a;border-radius:6px;padding:1px 7px;font-size:11px;font-weight:700}.msr-count.multi{background:#ede7fb;color:#6a3fc4}.boot-wait{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;gap:10px;align-items:center;justify-content:center;text-align:center;background:#fff;color:#5f6368}.boot-wait .bw-main{font-size:16px}.boot-wait .bw-sub{font-size:12.5px;color:#9aa0a6}.access-box{width:min(720px,92vw);margin:0 auto 18px;padding:12px 16px;background:#f8f9fa;border:1px solid #e8eaed;border-radius:10px;text-align:left}.ab-title{font-size:13px;font-weight:600;color:#3c4043;margin-bottom:8px}.ab-row{display:flex;align-items:center;gap:8px;margin:6px 0;flex-wrap:wrap}.ab-tag{font-size:11.5px;padding:2px 8px;border-radius:20px;white-space:nowrap}.ab-tag.lan{background:#e6f4ea;color:#137333}.ab-tag.net{background:#e8f0fe;color:#1967d2}.ab-row code{font-size:12.5px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#fff;border:1px solid #dadce0;border-radius:6px;padding:3px 8px;word-break:break-all}.ab-copy{font-size:12px;padding:3px 10px;border:1px solid #1a73e8;color:#1a73e8;background:#fff;border-radius:6px;cursor:pointer;white-space:nowrap}.ab-copy:hover{background:#e8f0fe}.ab-hint{font-size:11.5px;color:#80868b;margin-top:8px;line-height:1.6}.msr-del{margin-left:6px;padding:0 6px;font-size:12px;line-height:18px;border:1px solid #dadce0;background:#fff;color:#80868b;border-radius:5px;cursor:pointer}.msr-del:hover{border-color:#d93025;color:#d93025;background:#fce8e6}.msr-view{margin-left:6px;padding:0 7px;font-size:12px;line-height:18px;border:1px solid #c9c5f0;background:#f3efff;color:var(--brand-ink);border-radius:5px;cursor:pointer}.msr-view:hover{background:#e7e0fb}.hw-modal{max-width:720px}.hw-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.panel-tab2{border:1.5px solid var(--line);background:#fff;color:var(--ink-3);border-radius:9px;font-size:13px;font-weight:700;padding:6px 12px;cursor:pointer}.panel-tab2.on{background:#f3efff;border-color:#c9c5f0;color:var(--brand-ink)}.hw-list{display:flex;flex-direction:column;gap:10px;max-height:62vh;overflow-y:auto}.hw-item{border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;display:flex;flex-direction:column;gap:6px}.hw-item>div:first-child{display:flex;justify-content:space-between;gap:10px;align-items:center}.hw-info b{font-size:15px}.hw-meta{font-size:12px;color:var(--ink-3);display:block;margin-top:3px}.hw-done{color:var(--green);font-weight:600}.hw-todo{color:#c05f17;font-weight:600}.hw-expired{font-style:normal;color:var(--red);margin-left:8px}.hw-scores{border-top:1px dashed var(--line);padding-top:8px;display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:6px}.hw-score-row{display:flex;gap:8px;align-items:center;font-size:13px;background:#f8f7fb;border-radius:8px;padding:5px 10px}.hw-score-row>span:first-child{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.hw-score-row b{color:var(--brand-ink)}.hw-compose{display:flex;flex-direction:column;gap:10px}.hw-search{display:flex;gap:8px;align-items:center}.hw-search input{flex:1;border:1.5px solid var(--line);border-radius:10px;padding:8px 12px;font-size:14px;outline:none}.hw-bank{max-height:38vh;overflow-y:auto;border:1px solid var(--line);border-radius:10px;display:flex;flex-direction:column}.hw-bank-row{display:flex;gap:10px;align-items:center;padding:9px 12px;border-bottom:1px solid #f2f1ee;cursor:pointer}.hw-bank-row:last-child{border-bottom:none}.hw-bank-row:hover{background:#f6f5fa}.hw-bank-row.on{background:#f3efff}.hw-bank-row input{width:17px;height:17px;accent-color:var(--brand)}.hw-bank-info b{font-size:13.5px;display:block}.hw-form{display:grid;grid-template-columns:1.4fr 1fr 1fr auto;gap:10px;align-items:end}@media (max-width: 640px){.hw-form{grid-template-columns:1fr 1fr}}.mk-fs-bar{display:flex;align-items:center;gap:4px;justify-content:flex-end;margin-bottom:4px;-webkit-user-select:none;user-select:none}.mk-fs-btn{border:1px solid var(--line);background:#fff;color:var(--ink-2);border-radius:8px;cursor:pointer;line-height:1;padding:4px 9px;font-weight:700}.mk-fs-btn:hover{border-color:#c9c5f0;color:var(--brand-ink)}.mk-fs-btn:disabled{opacity:.4;cursor:not-allowed}.mk-fs-val{font-size:11px;color:var(--ink-3);min-width:34px;text-align:center;font-variant-numeric:tabular-nums}.hw-bank-row.badrow{background:#fffaf5;cursor:not-allowed}.hw-badtag{font-style:normal;font-size:11px;font-weight:700;color:#b3541e;background:#fff1e4;border-radius:6px;padding:2px 7px;margin-left:8px}.hw-submode{display:flex;gap:6px;align-items:center}.hw-qtype{display:flex;flex-direction:column;gap:8px;border:1px solid var(--line);border-radius:10px;padding:12px;max-height:38vh;overflow-y:auto}.hw-qtype-row{display:flex;gap:8px;align-items:center}.hw-qtype-row select{flex:1;border:1.5px solid var(--line);border-radius:8px;padding:7px 10px;font-size:13px;background:#fff;outline:none}.hw-qtype-n{display:flex;gap:6px;align-items:center;font-size:12px;color:var(--ink-3)}.hw-qtype-n select{width:64px}.qs-modal{max-width:680px}.qs-list{max-height:56vh;overflow-y:auto;display:flex;flex-direction:column;gap:8px}.qs-row{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:10px;padding:9px 12px}.qs-row.clickable{cursor:pointer}.qs-row.clickable:hover{border-color:#c9c5f0;background:#f8f7fc}.qs-num{flex:none;width:34px;height:26px;border-radius:7px;background:#f2f0fb;color:var(--brand-ink);font-weight:800;font-size:13px;display:grid;place-items:center}.qs-main{flex:1;min-width:0}.qs-stem{font-size:13px;color:var(--ink-2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.qs-qtype{font-style:normal;font-size:11px;font-weight:700;color:var(--ink-3);background:#f2f1f5;border-radius:5px;padding:1px 6px;margin-right:7px}.qs-barline{display:flex;align-items:center;gap:8px;margin-top:5px}.qs-bar{flex:1;max-width:220px;height:7px;border-radius:999px;background:#eef0f4;overflow:hidden}.qs-bar i{display:block;height:100%;border-radius:999px}.qs-acc{font-size:12.5px;font-weight:800;min-width:38px}.qs-frac{font-size:11.5px;color:var(--ink-3)}.qs-given{font-size:11.5px;color:#a05a17;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.qs-wrongcount{font-size:11.5px;font-weight:700;color:var(--red)}.qs-sec-title{font-size:12px;font-weight:700;color:var(--ink-3);margin:14px 0 8px}.qs-qtypes{display:flex;flex-direction:column;gap:6px}.qs-qtype-row{display:flex;align-items:center;gap:10px}.qs-qtype-name{width:74px;flex:none;font-size:12.5px;font-weight:600;color:var(--ink-2)}.sr-row{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:10px;padding:9px 12px}.sr-row.right{border-color:#b7e4c7;background:#f3fbf5}.sr-row.wrong{border-color:#f6c9c4;background:#fdf3f2}.sr-row.unjudged{border-style:dashed}.sr-row .qs-stem{white-space:normal;display:flex;align-items:center;gap:8px;flex-wrap:wrap}.sr-mark{font-size:11.5px;font-weight:800;padding:1px 7px;border-radius:6px;margin-left:auto}.sr-mark.ok{background:#e3f6ea;color:#1c7a46}.sr-mark.no{background:#fce6e4;color:#c2392f}.sr-mark.na{background:#eef0f4;color:var(--ink-3)}.sr-answers{display:flex;flex-direction:column;gap:3px;margin-top:6px;font-size:12.5px}.sr-given,.sr-correct{color:var(--ink-2)}.sr-given b,.sr-correct b{color:var(--ink-3);font-weight:700}.sr-correct{color:#1c7a46}.sr-blank{color:var(--ink-3);font-style:normal}.sr-exp{color:var(--ink-3);font-size:12px}