:root{color:#17201b;background:#f5f6f1;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none;line-height:1.5;text-rendering:optimizeLegibility}html,body,#root{height:100%;overflow:hidden}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100dvh}.app-shell{background:linear-gradient(90deg,#eef3f1 0,#eef3f1 44%,#f9faf6 44%,#f9faf6);display:grid;grid-template-columns:minmax(320px,.95fr) minmax(360px,1.05fr);height:100dvh;min-height:0;overflow:hidden}.avatar-stage,.practice-panel{min-width:0}.avatar-stage{align-items:stretch;border-right:1px solid rgba(39,70,62,.14);display:flex;height:100%;min-height:0;overflow:hidden;position:relative}.avatar-stage:before{background:linear-gradient(rgba(48,86,76,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(48,86,76,.07) 1px,transparent 1px);background-size:40px 40px;content:"";top:0;right:0;bottom:0;left:0;position:absolute}.status-pill{align-items:center;background:#ffffffd6;border:1px solid rgba(58,117,100,.18);border-radius:999px;color:#31594e;display:inline-flex;font-size:.86rem;font-weight:750;gap:.45rem;line-height:1;min-height:38px;padding:.65rem .9rem;position:absolute;right:1rem;top:1rem;z-index:3}.avatar-picker{align-items:stretch;background:#ffffffd6;border:1px solid rgba(58,117,100,.18);border-radius:8px;display:grid;gap:.25rem;grid-template-columns:repeat(3,minmax(0,1fr));left:1rem;max-width:min(58vw,430px);padding:.3rem;position:absolute;top:1rem;z-index:3}.avatar-option{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:transparent;border:1px solid transparent;border-radius:6px;color:#31594e;cursor:pointer;display:grid;font:inherit;gap:.08rem;line-height:1.15;min-height:48px;min-width:0;padding:.45rem .55rem;text-align:left}.avatar-option:hover{background:#e7f0eec7}.avatar-option[aria-pressed=true]{background:#244d5a;color:#fff}.avatar-option span,.avatar-option small{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.avatar-option span{font-size:.86rem;font-weight:850}.avatar-option small{font-size:.68rem;font-weight:700;opacity:.78}.live2d-stage{flex:1;height:100%;min-height:0;position:relative;z-index:1}.live2d-canvas-host{top:0;right:0;bottom:0;left:0;overflow:hidden;position:absolute}.live2d-canvas-host canvas{display:block;height:100%;width:100%}.live2d-fallback{align-items:center;background:#ffffffc7;border:1px solid rgba(48,86,76,.12);border-radius:8px;color:#44544f;display:flex;font-size:.95rem;font-weight:750;inset:42% auto auto 50%;min-height:44px;padding:0 1rem;position:absolute;transform:translate(-50%,-50%);white-space:nowrap}.waveform{align-items:end;bottom:2rem;display:flex;gap:.55rem;height:52px;justify-content:center;left:50%;pointer-events:none;position:absolute;transform:translate(-50%);z-index:2}.waveform span{animation:pulse 1.6s ease-in-out infinite;background:#326b7c;border-radius:999px;display:block;height:24px;opacity:.64;width:9px}.waveform[data-state=speaking] span,.waveform[data-state="user speaking"] span{background:#d66a48;opacity:.95}.waveform span:nth-child(2){animation-delay:.14s;height:42px}.waveform span:nth-child(3){animation-delay:.28s;height:32px}.waveform span:nth-child(4){animation-delay:.42s;height:48px}.practice-panel{display:grid;grid-template-rows:auto minmax(0,1fr) auto auto;gap:1rem;height:100%;min-height:0;overflow:hidden;padding:clamp(1rem,2.4vw,2rem)}.practice-panel header{align-items:center;display:flex;gap:1rem;justify-content:space-between}.practice-panel h1{color:#192822;font-size:clamp(1.35rem,2vw,1.75rem);font-weight:800;letter-spacing:0;line-height:1.1;margin:0}.mode-indicator{align-items:center;background:#e7f0ee;border:1px solid rgba(55,96,88,.14);border-radius:999px;color:#263f39;display:inline-flex;font-size:.86rem;font-weight:800;gap:.45rem;line-height:1;min-height:38px;padding:.65rem .85rem;white-space:nowrap}.chat-thread{align-content:end;display:grid;gap:.85rem;min-height:0;overscroll-behavior:contain;overflow-y:auto;padding:.25rem .15rem .75rem;scrollbar-color:rgba(54,82,74,.36) transparent}.empty-thread{align-self:center;color:#63716c;font-size:.95rem;font-weight:700;justify-self:center}.message-row{display:grid;gap:.35rem;max-width:min(88%,680px)}.message-row.user{justify-self:end}.message-row.tutor{justify-self:start}.speaker-label{color:#62736d;font-size:.72rem;font-weight:850;letter-spacing:.08em;text-transform:uppercase}.message-row.user .speaker-label{text-align:right}.message-bubble{border:1px solid rgba(37,62,55,.12);border-radius:8px;font-size:clamp(.98rem,1.15vw,1.08rem);line-height:1.55;margin:0;overflow-wrap:anywhere;padding:.82rem .95rem}.message-row.tutor .message-bubble{background:#eef5f4;color:#203b37}.message-row.user .message-bubble{background:#fff2eb;border-color:#a957362e;color:#44261c}.message-row.live .message-bubble{opacity:.78}.message-bubble[data-streaming=true]:after{animation:blink 1s ease-in-out infinite;content:"";display:inline-block;height:1em;margin-left:.25rem;transform:translateY(.16em);width:.45em;background:currentColor}.metrics-grid{display:grid;gap:.75rem;grid-template-columns:repeat(3,minmax(0,1fr))}.metrics-grid span{background:#eff2f7;border:1px solid rgba(38,92,116,.12);border-radius:8px;color:#315567;font-size:.86rem;font-weight:800;min-width:0;padding:.75rem;text-align:center}.listening-strip{align-items:center;background:#244d5a;border-radius:8px;color:#fff;display:inline-flex;font-weight:800;gap:.55rem;justify-content:center;min-height:52px;padding:0 1rem;width:100%}@keyframes pulse{0%,to{transform:scaleY(.7)}50%{transform:scaleY(1.12)}}@keyframes blink{0%,to{opacity:.2}50%{opacity:1}}@media (max-width: 820px){.app-shell{background:#f9faf6;grid-template-columns:1fr;grid-template-rows:minmax(0,46dvh) minmax(0,54dvh)}.avatar-stage{border-bottom:1px solid rgba(39,70,62,.14);border-right:0;height:auto;min-height:0}.live2d-stage{height:100%;min-height:0}.practice-panel{height:auto;min-height:0}.avatar-picker{max-width:calc(100vw - 2rem)}}@media (max-width: 520px){.avatar-picker{left:.75rem;right:.75rem;top:.75rem}.avatar-option{min-height:42px;padding:.38rem .4rem}.avatar-option span{font-size:.78rem}.avatar-option small{font-size:.58rem}.status-pill{bottom:.75rem;right:.75rem;top:auto}.practice-panel header{align-items:flex-start;flex-direction:column}.message-row{max-width:94%}.metrics-grid{grid-template-columns:1fr}}