:root{--bg:#fff;--surface:#f7f7f7;--surface-2:#eee;--surface-3:#e3e3e3;--fg:#0f0f0f;--fg-2:rgba(0,0,0,.72);--muted:rgba(0,0,0,.4);--border:rgba(0,0,0,.08);--border-2:rgba(0,0,0,.13);--accent:#de7356;--accent-dim:rgba(222,115,86,.1);--accent-glow:rgba(222,115,86,.28);--success:#16a34a;--danger:#dc2626;--warn:#ca8a04;--sidebar-w:268px;--sidebar-collapsed-w:48px;--topbar-h:52px;--bottom-bar-h:72px;--font:-apple-system,BlinkMacSystemFont,"Inter","SF Pro Text",system-ui,sans-serif}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body,html{width:100%;height:100%;overflow:hidden;background:var(--bg);color:var(--fg);font-family:var(--font);-webkit-font-smoothing:antialiased;display:flex;flex-direction:column}.shell{display:block;flex:1 1;min-height:0;overflow:hidden}@media (min-width:1024px){.shell{display:grid;grid-template-columns:var(--sidebar-w) 1fr;grid-template-areas:"sidebar chat";transition:grid-template-columns .26s cubic-bezier(.4,0,.2,1)}.shell.sidebar-off{grid-template-columns:0 1fr}}.topbar{height:var(--topbar-h);background:var(--surface);border-bottom:1px solid var(--border);padding:0 20px;gap:10px;z-index:10}.logo-mark,.topbar{display:flex;align-items:center;flex-shrink:0}.logo-mark{width:30px;height:30px;background:var(--accent);border-radius:7px;justify-content:center}.logo-wordmark{font-size:14.5px;font-weight:700;letter-spacing:-.025em;color:var(--fg);white-space:nowrap}.logo-wordmark em{color:var(--accent);font-style:normal}.topbar-toggle{display:flex;align-items:center;justify-content:center;width:40px;height:40px;flex-shrink:0;border:none;background:transparent;color:var(--fg-2);cursor:pointer;border-radius:8px;transition:background .12s}.topbar-toggle:hover{background:var(--surface-2)}.topbar-end-btn{margin-left:auto;padding:6px 14px;border-radius:7px;border:1px solid var(--border-2);background:transparent;color:var(--muted);font-size:11.5px;cursor:pointer;transition:all .12s;font-family:var(--font)}.topbar-end-btn:hover{border-color:var(--danger);color:var(--danger)}.sidebar-backdrop{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:199}.sidebar-backdrop.visible{display:block}@media (min-width:1024px){.sidebar-backdrop{display:none!important}}.sidebar{position:fixed;top:0;left:0;height:100vh;width:280px;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden;min-width:0;transform:translateX(-100%);transition:transform .25s cubic-bezier(.4,0,.2,1);z-index:200}.sidebar.open{transform:translateX(0)}@media (min-width:1024px){.sidebar{position:static;grid-area:sidebar;width:var(--sidebar-w);height:100%;transform:none;z-index:auto;transition:width .26s cubic-bezier(.4,0,.2,1)}.shell.sidebar-off .sidebar{width:0;pointer-events:none}.sidebar-toggle-btn{display:none}}.sidebar-head{height:52px;display:flex;align-items:center;justify-content:space-between;padding:0 14px;border-bottom:1px solid var(--border);flex-shrink:0}.sidebar-head-title{font-size:12px;font-weight:600;color:var(--fg-2);letter-spacing:.01em}.sidebar-toggle-btn{margin-left:auto;width:26px;height:26px;border:1px solid var(--border-2);border-radius:6px;background:transparent;color:var(--muted);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .12s,color .12s;flex-shrink:0}.sidebar-toggle-btn:hover{background:var(--surface-2);color:var(--fg-2)}.shell.sidebar-off .sidebar-toggle-btn svg{transform:scaleX(-1)}.sidebar-scroll{flex:1 1;overflow-y:auto;padding:18px 12px 12px;scrollbar-width:none}.sidebar-scroll::-webkit-scrollbar{display:none}.sidebar-section{margin-bottom:24px}.sidebar-label{font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--fg-2);padding:0 8px;margin-bottom:6px}.type-list{display:flex;flex-direction:column;gap:1px}.type-btn{display:flex;align-items:center;gap:9px;padding:9px 10px;border-radius:7px;border:none;background:transparent;color:var(--fg-2);font-size:12.5px;font-weight:500;cursor:pointer;transition:background .12s,color .12s;width:100%;text-align:left;font-family:var(--font);min-height:44px}.type-btn:hover{background:var(--surface-2);color:var(--fg)}.type-btn.active{background:rgba(222,115,86,.18);color:var(--fg);font-weight:600;box-shadow:inset 3px 0 0 var(--accent)}.type-icon{width:26px;height:26px;border-radius:6px;background:var(--surface-3);display:flex;align-items:center;justify-content:center;font-size:13px;flex-shrink:0}.type-btn.active .type-icon{background:rgba(222,115,86,.18)}.type-dot{margin-left:auto;width:5px;height:5px;border-radius:50%;background:var(--accent);opacity:0;transition:opacity .12s;flex-shrink:0}.type-btn.active .type-dot{opacity:1}.sidebar-footer{padding:12px;border-top:1px solid var(--border);flex-shrink:0}.diff-label{font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--fg-2);padding:0 4px;margin-bottom:8px}.diff-pills{display:flex;gap:6px}.pill{flex:1 1;padding:5px 0;border-radius:6px;font-size:11.5px;font-weight:500;border:1px solid var(--border-2);background:transparent;color:var(--fg-2);cursor:pointer;transition:all .12s;font-family:var(--font)}.pill:hover{color:var(--fg);border-color:rgba(0,0,0,.25)}.pill.active{background:var(--accent);border-color:var(--accent);color:#fff}.chat-panel{background:var(--surface);display:flex;flex-direction:column;overflow:hidden;position:relative;width:100%;height:100%;background-image:radial-gradient(circle,rgba(222,115,86,.08) 1px,transparent 0);background-size:40px 40px}@media (min-width:1024px){.chat-panel{grid-area:chat}}.chat-head{padding:16px 20px;border-bottom:1px solid var(--border);justify-content:space-between;flex-shrink:0;background:var(--surface)}.chat-head,.chat-head-title{display:flex;align-items:center}.chat-head-title{font-size:12.5px;font-weight:600;gap:7px}.ai-dot{width:7px;height:7px;border-radius:50%;background:var(--success)}.chat-head-sub{font-size:10.5px;color:var(--muted);margin-top:2px}.icon-btn{width:44px;height:44px;border-radius:6px;border:1px solid var(--border-2);background:transparent;color:var(--muted);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .12s;font-size:12px}@media (min-width:1024px){.icon-btn{width:28px;height:28px}}.answer-timer,.icon-btn:hover{background:var(--surface-2);color:var(--fg-2)}.answer-timer{display:flex;align-items:center;gap:5px;padding:4px 10px;border-radius:6px;border:1px solid var(--border-2);font-size:12px;font-weight:600;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;transition:color .2s,border-color .2s}.answer-timer.warn{color:var(--warn);border-color:rgba(202,138,4,.3)}.answer-timer.danger{color:var(--danger);border-color:rgba(220,38,38,.3);animation:timer-pulse .8s ease-in-out infinite}@keyframes timer-pulse{0%,to{opacity:1}50%{opacity:.6}}.timer-dot{width:5px;height:5px;border-radius:50%;background:var(--danger);animation:blink 1s infinite}.metrics-bar{display:none}@media (min-width:1024px){.metrics-bar{display:block;border-bottom:1px solid var(--border);overflow:hidden;max-height:0;transition:max-height .32s cubic-bezier(.4,0,.2,1);flex-shrink:0;background:var(--surface)}.metrics-bar.show{max-height:140px}}.metrics-head{display:flex;align-items:center;gap:7px;padding:9px 14px 5px}.metrics-head-label{font-size:9px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}.metrics-live-pip{width:5px;height:5px;border-radius:50%;background:var(--danger);animation:blink 1s infinite}.metrics-live-pip.idle{background:var(--muted);animation:none}.metrics-row{display:grid;grid-template-columns:1fr 1fr 1fr;padding:2px 6px 10px}.metric-cell{padding:4px 8px;display:flex;flex-direction:column;align-items:center;gap:3px;position:relative}.metric-cell+.metric-cell:before{content:"";position:absolute;left:0;top:10%;bottom:10%;width:1px;background:var(--border)}.metric-val{font-size:22px;font-weight:800;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;letter-spacing:-.03em;line-height:1;color:var(--fg);transition:color .3s}.metric-val.warn{color:var(--warn)}.metric-val.danger{color:var(--danger)}.metric-lbl{font-size:9px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.metric-sub{font-size:9.5px;color:var(--muted);max-width:88px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:center}.pace-bar-wrap{width:76px;height:4px;background:var(--surface-3);border-radius:2px;position:relative;overflow:visible;margin-top:2px}.pace-bar-fill{position:absolute;left:0;top:0;bottom:0;border-radius:2px;background:var(--success);transition:width .6s ease,background .3s}.pace-bar-dot{position:absolute;top:50%;transform:translate(-50%,-50%);width:8px;height:8px;border-radius:50%;background:var(--fg);border:1.5px solid var(--bg);transition:left .6s ease}.conf-ring-wrap{position:relative;width:40px;height:40px;display:flex;align-items:center;justify-content:center}.conf-ring{position:absolute;inset:0;transform:rotate(-90deg)}.conf-ring .cr-track{fill:none;stroke:var(--surface-3);stroke-width:3}.conf-ring .cr-fill{fill:none;stroke:var(--success);stroke-width:3;stroke-linecap:round;stroke-dasharray:113.1;stroke-dashoffset:113.1;transition:stroke-dashoffset .6s ease,stroke .3s}.conf-ring-val{font-size:10px;font-weight:700;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;color:var(--fg);position:relative;z-index:1}.chat-msgs{flex:1 1;overflow-y:auto;padding:12px;padding-bottom:calc(var(--bottom-bar-h) + 12px);display:flex;flex-direction:column;gap:10px;scrollbar-width:thin;scrollbar-color:var(--border-2) transparent}@media (min-width:1024px){.chat-msgs{padding:14px}}.chat-msgs::-webkit-scrollbar{width:3px}.chat-msgs::-webkit-scrollbar-thumb{background:var(--border-2);border-radius:2px}.chat-empty{flex:1 1;flex-direction:column;gap:10px}.chat-empty,.chat-empty-icon{display:flex;align-items:center;justify-content:center}.chat-empty-icon{width:38px;height:38px;border-radius:9px;background:var(--surface-2);font-size:16px}.chat-empty-txt{font-size:11.5px;color:var(--muted);text-align:center;line-height:1.5;max-width:190px}.msg{display:flex;flex-direction:column;gap:3px}.msg.user{align-items:flex-end}.msg.ai{align-items:flex-start}.msg-from{font-size:10px;color:var(--muted);padding:0 2px}.msg-bubble{max-width:88%;padding:9px 13px;border-radius:10px;font-size:12.5px;line-height:1.55}@media (min-width:1024px){.msg-bubble{max-width:80%}}.msg.ai .msg-bubble{background:var(--surface-2);color:var(--fg-2);border-bottom-left-radius:3px}.msg.user .msg-bubble{background:var(--accent-dim);color:var(--fg);border:1px solid rgba(222,115,86,.18);border-bottom-right-radius:3px}.msg-bubble.feedback-card{background:rgba(34,197,94,.07);border:1px solid rgba(34,197,94,.18);color:var(--fg-2)}.fb-score{font-size:11px;font-weight:700;color:var(--success);margin-bottom:4px}.fb-score,.typing-wrap{display:flex;align-items:center;gap:4px}.typing-wrap{padding:9px 13px;background:var(--surface-2);border-radius:10px;border-bottom-left-radius:3px;width:-moz-fit-content;width:fit-content}.t-dot{width:5px;height:5px;border-radius:50%;background:var(--muted);animation:tdot 1.1s ease-in-out infinite}.t-dot:nth-child(2){animation-delay:.18s}.t-dot:nth-child(3){animation-delay:.36s}@keyframes tdot{0%,to{transform:translateY(0);opacity:.35}50%{transform:translateY(-4px);opacity:1}}.chat-idle{flex:1 1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;padding:32px}.status-badge{display:inline-flex;align-items:center;gap:7px;padding:5px 14px;border-radius:999px;background:var(--surface-2);border:1px solid var(--border-2);font-size:11.5px;font-weight:500;color:var(--fg-2)}.status-dot{width:6px;height:6px;border-radius:50%;background:var(--muted)}.status-badge.ready .status-dot{background:var(--success)}.status-badge.live .status-dot{background:var(--danger);animation:blink 1s infinite}@keyframes blink{0%,to{opacity:1}50%{opacity:.3}}.session-card{background:var(--surface);border:1px solid var(--border-2);border-radius:16px;padding:24px 20px;min-width:unset;max-width:520px;width:100%;display:flex;flex-direction:column;align-items:center;text-align:center;box-shadow:0 4px 32px rgba(0,0,0,.06)}@media (min-width:640px){.session-card{padding:32px 44px}}.type-badge{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:5px;background:var(--accent-dim);color:var(--accent);font-size:10.5px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;margin-bottom:14px}.session-title{font-size:17px;font-weight:700;letter-spacing:-.02em;margin-bottom:6px}@media (min-width:640px){.session-title{font-size:20px}}.session-desc{font-size:13px;color:var(--muted);line-height:1.55;max-width:310px;margin-bottom:28px}.start-btn{display:inline-flex;align-items:center;gap:9px;padding:13px 36px;background:var(--accent);color:#fff;border:none;border-radius:10px;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s,transform .15s,box-shadow .15s;font-family:var(--font);letter-spacing:.01em}.start-btn:hover{background:#c8604a;transform:translateY(-1px);box-shadow:0 8px 24px var(--accent-glow)}.start-btn:active{transform:translateY(0)}.start-btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}.session-stats{display:flex;gap:28px;margin-top:20px;padding-top:20px;border-top:1px solid var(--border);width:100%;justify-content:center}.stat{text-align:center}.stat-val{font-size:17px;font-weight:700;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.stat-lbl{font-size:10.5px;color:var(--muted);margin-top:2px}.voice-input-area{position:fixed;bottom:0;left:0;right:0;height:var(--bottom-bar-h);border-top:1px solid var(--border);display:flex;flex-direction:row;align-items:center;justify-content:space-between;padding:0 20px;gap:12px;background:var(--surface);z-index:100}.mic-hint{display:none}@media (min-width:1024px){.voice-input-area{position:static;height:auto;flex-direction:column;justify-content:center;padding:20px 24px 28px}.mic-hint{display:block;font-size:11.5px;color:var(--muted);text-align:center}}.waveform{display:flex;align-items:center;gap:3px;height:36px}.w-bar{width:3px;background:var(--accent);border-radius:2px;animation:wv 1.3s ease-in-out infinite}.w-bar:first-child{animation-delay:0s;height:8px}.w-bar:nth-child(2){animation-delay:.1s;height:16px}.w-bar:nth-child(3){animation-delay:.2s;height:26px}.w-bar:nth-child(4){animation-delay:.12s;height:20px}.w-bar:nth-child(5){animation-delay:.05s;height:12px}.w-bar:nth-child(6){animation-delay:.17s;height:22px}.w-bar:nth-child(7){animation-delay:.07s;height:10px}@keyframes wv{0%,to{transform:scaleY(.3)}50%{transform:scaleY(1)}}.waveform.idle .w-bar{animation:none;transform:scaleY(.25)}.mic-btn{width:52px;height:52px;border-radius:50%;background:var(--accent);border:none;color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .18s,box-shadow .18s,background .18s;box-shadow:0 4px 20px var(--accent-glow);flex-shrink:0}.mic-btn:hover:not(:disabled){transform:scale(1.06)}@media (min-width:1024px){.mic-btn{width:80px;height:80px}}.mic-btn.recording{background:var(--danger);animation:mic-ring 1.5s ease-in-out infinite;box-shadow:0 4px 20px rgba(220,38,38,.3)}@keyframes mic-ring{0%,to{box-shadow:0 0 0 0 rgba(239,68,68,.35),0 4px 20px rgba(220,38,38,.3)}50%{box-shadow:0 0 0 18px rgba(239,68,68,0),0 4px 20px rgba(220,38,38,.3)}}.mic-btn:disabled{opacity:.45;cursor:not-allowed}.mic-hint{text-align:center}.end-btn,.mic-hint{font-size:11.5px;color:var(--muted)}.end-btn{padding:7px 18px;border-radius:7px;border:1px solid var(--border-2);background:transparent;cursor:pointer;transition:all .12s;font-family:var(--font)}.end-btn:hover{border-color:var(--danger);color:var(--danger)}.countdown-overlay{position:absolute;inset:0;background:rgba(0,0,0,.88);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;z-index:100;opacity:0;pointer-events:none;transition:opacity .25s}.countdown-overlay.show{opacity:1;pointer-events:all}.cd-label{font-size:12px;color:var(--muted);letter-spacing:.1em;text-transform:uppercase;font-weight:500}.cd-ring-wrap{position:relative;width:148px;height:148px;display:flex;align-items:center;justify-content:center}.cd-ring{position:absolute;inset:0;transform:rotate(-90deg)}.cd-ring .track{fill:none;stroke:rgba(222,115,86,.12);stroke-width:3}.cd-ring .progress{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;stroke-dasharray:427;stroke-dashoffset:0;transition:stroke-dashoffset .95s linear}.cd-num{font-size:72px;font-weight:800;letter-spacing:-.04em;color:var(--accent);line-height:1;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;text-shadow:0 0 48px var(--accent-glow);position:relative;z-index:1}.cd-sub{font-size:11.5px;color:var(--muted)}