:root{--bg: #0a0e14;--bg-elevated: #131922;--bg-card: #1a2130;--border: #252d3d;--text: #e8edf5;--text-dim: #8892a6;--text-faint: #5a6478;--accent: #4f8cff;--accent-dim: #2d5aa8;--success: #34d399;--warning: #fbbf24;--danger: #f87171;--radius: 14px;--radius-sm: 9px;--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-top: env(safe-area-inset-top, 0px)}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.5;overscroll-behavior:none;-webkit-font-smoothing:antialiased}#root{display:flex;flex-direction:column;max-width:560px;margin:0 auto;min-height:100dvh}button{font:inherit;color:inherit;border:none;background:none;cursor:pointer}.screen{flex:1;display:flex;flex-direction:column;padding:calc(16px + var(--safe-top)) 16px calc(16px + var(--safe-bottom));gap:16px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px}.title{font-size:20px;font-weight:650;letter-spacing:-.01em;margin:0}.subtitle{font-size:13px;color:var(--text-dim);margin:0}.card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);padding:16px}.card-tight{padding:12px 14px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 20px;border-radius:var(--radius-sm);font-weight:600;font-size:15px;transition:opacity .15s,transform .1s}.btn:active:not(:disabled){transform:scale(.98)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-secondary{background:var(--bg-card);border:1px solid var(--border);color:var(--text)}.btn-ghost{color:var(--text-dim);padding:8px 12px}.btn-block{width:100%}.btn-lg{padding:16px 24px;font-size:16px}.options{display:flex;flex-direction:column;gap:10px}.option{display:flex;align-items:center;gap:12px;width:100%;min-height:56px;padding:14px 16px;background:var(--bg-card);border:1.5px solid var(--border);border-radius:var(--radius-sm);text-align:left;font-size:15px;transition:border-color .15s,background .15s}.option:active:not(:disabled){background:var(--bg-elevated)}.option-label{flex-shrink:0;width:24px;height:24px;display:grid;place-items:center;border-radius:50%;background:var(--bg);color:var(--text-dim);font-size:12px;font-weight:700}.option-pos{flex-shrink:0;font-size:12px;color:var(--text-faint);font-style:italic;min-width:24px}.option-correct{border-color:var(--success);background:#34d3991f}.option-correct .option-label{background:var(--success);color:#04140d}.option-wrong{border-color:var(--danger);background:#f871711f}.option-wrong .option-label{background:var(--danger);color:#1a0505}.option-muted{opacity:.45}.word-hero{display:flex;flex-direction:column;align-items:center;gap:6px;padding:20px 0 8px}.word-text{font-size:38px;font-weight:700;letter-spacing:-.02em;line-height:1.15;word-break:break-word;text-align:center}.phonetic{font-size:15px;color:var(--text-dim);font-family:SF Mono,ui-monospace,monospace}.sentence{font-size:17px;line-height:1.65;color:var(--text);margin:0}.sentence-zh{font-size:14px;color:var(--text-dim);margin:10px 0 0;padding-top:10px;border-top:1px solid var(--border)}.target-word{color:var(--accent);font-weight:650}.progress-bar{height:4px;background:var(--border);border-radius:2px;overflow:hidden}.progress-fill{height:100%;background:var(--accent);transition:width .35s cubic-bezier(.4,0,.2,1)}.progress-meta{display:flex;justify-content:space-between;font-size:13px;color:var(--text-dim)}.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.stat{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 12px;text-align:center}.stat-value{font-size:24px;font-weight:700;line-height:1.2}.stat-label{font-size:12px;color:var(--text-dim);margin-top:2px}.bars{display:flex;align-items:flex-end;gap:6px;height:88px}.bar-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;height:100%;justify-content:flex-end}.bar{width:100%;background:var(--accent-dim);border-radius:3px 3px 0 0;min-height:2px;transition:height .3s}.bar-today{background:var(--accent)}.bar-label{font-size:10px;color:var(--text-faint)}.empty{flex:1;display:grid;place-content:center;text-align:center;gap:10px;padding:40px 20px;color:var(--text-dim)}.empty-icon{font-size:40px;opacity:.5}.error-box{background:#f871711a;border:1px solid rgb(248 113 113 / 30%);border-radius:var(--radius-sm);padding:12px 14px;font-size:14px;color:#fca5a5;line-height:1.6;word-break:break-word}.notice-box{background:#4f8cff1a;border:1px solid rgb(79 140 255 / 28%);border-radius:var(--radius-sm);padding:12px 14px;font-size:14px;color:#a8c7ff}.spinner{width:18px;height:18px;border:2px solid rgb(255 255 255 / 25%);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-screen{flex:1;display:grid;place-content:center;gap:14px;color:var(--text-dim);text-align:center}.toast-layer{position:fixed;top:calc(12px + var(--safe-top));left:50%;transform:translate(-50%);width:min(92vw,520px);z-index:100;display:flex;flex-direction:column;gap:8px;pointer-events:none}.toast{pointer-events:auto;background:var(--bg-card);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--radius-sm);padding:11px 14px;font-size:14px;box-shadow:0 8px 24px #00000073;animation:slide-in .25s cubic-bezier(.2,.9,.3,1)}.toast-mistake{border-left-color:var(--warning)}.toast-error{border-left-color:var(--danger)}.toast-title{font-weight:650;font-size:13px;margin-bottom:3px}.toast-body{color:var(--text-dim);line-height:1.45;word-break:break-word}@keyframes slide-in{0%{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:translateY(0)}}.drawer-backdrop{position:fixed;inset:0;background:#0009;z-index:90;animation:fade-in .2s}@keyframes fade-in{0%{opacity:0}}.drawer{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:min(100vw,560px);max-height:70dvh;background:var(--bg-elevated);border-radius:20px 20px 0 0;border-top:1px solid var(--border);padding:18px 18px calc(18px + var(--safe-bottom));z-index:91;display:flex;flex-direction:column;gap:14px;animation:slide-up .28s cubic-bezier(.2,.9,.3,1);overflow-y:auto}@keyframes slide-up{0%{transform:translate(-50%,100%)}}.drawer-handle{width:36px;height:4px;border-radius:2px;background:var(--border);margin:0 auto 2px;flex-shrink:0}.hint-en{font-size:17px;line-height:1.65;min-height:3em}.hint-zh{font-size:14px;color:var(--text-dim);padding-top:10px;border-top:1px solid var(--border)}.cursor-blink:after{content:"▍";animation:blink 1s step-end infinite;color:var(--accent)}@keyframes blink{50%{opacity:0}}.voice-screen{justify-content:space-between}.call-orb{flex:1;display:grid;place-content:center;gap:18px;text-align:center;padding:20px}.orb{width:168px;height:168px;margin:0 auto;border-radius:50%;background:radial-gradient(circle at 34% 30%,#5b9bff,#2a4a8a 62%,#16243d);position:relative;display:grid;place-items:center;font-size:42px;transition:transform .24s cubic-bezier(.2,.9,.3,1),box-shadow .24s;box-shadow:0 0 #4f8cff73}.orb-speaking{transform:scale(1.07);box-shadow:0 0 48px 10px #4f8cff4d}.orb-listening{transform:scale(.97);box-shadow:0 0 30px 4px #34d3993d}.orb-idle{opacity:.72}.caption-stream{width:100%;max-height:34dvh;overflow-y:auto;display:flex;flex-direction:column;gap:9px;padding:4px 2px;scrollbar-width:none}.caption-stream::-webkit-scrollbar{display:none}.caption{font-size:14px;line-height:1.55;padding:9px 12px;border-radius:12px;max-width:88%;word-break:break-word}.caption-user{align-self:flex-end;background:var(--accent-dim);color:#eaf1ff;border-bottom-right-radius:4px}.caption-ai{align-self:flex-start;background:var(--bg-card);color:var(--text);border-bottom-left-radius:4px}.caption-interim{opacity:.62;font-style:italic}.call-controls{display:flex;align-items:center;justify-content:center;gap:18px;padding-top:4px}.ctrl-btn{display:grid;place-items:center;gap:5px;width:68px;height:68px;border-radius:50%;background:var(--bg-card);border:1px solid var(--border);font-size:23px;transition:background .15s,transform .1s}.ctrl-btn:active{transform:scale(.94)}.ctrl-btn-primary{width:84px;height:84px;background:var(--accent);border-color:transparent;font-size:27px;box-shadow:0 6px 22px #4f8cff57}.ctrl-btn-active{background:var(--danger);border-color:transparent}.ctrl-label{font-size:10px;color:var(--text-dim)}.target-pill{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:999px;font-size:13px}.target-pill-done{border-color:#34d39966;color:var(--success)}.target-list{display:flex;flex-wrap:wrap;gap:7px}.target-chip{padding:5px 11px;border-radius:999px;background:var(--bg-card);border:1px solid var(--border);font-size:13px}.target-chip-active{border-color:var(--accent);color:var(--accent)}.target-chip-done{border-color:#34d39966;color:var(--success);text-decoration:line-through}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.field-label{font-size:13px;color:var(--text-dim)}.field-hint{font-size:12px;color:var(--text-faint);line-height:1.45}.input{padding:11px 13px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-size:15px;font-family:inherit;width:100%}.input:focus{outline:none;border-color:var(--accent)}.textarea{min-height:200px;resize:vertical;font-family:SF Mono,ui-monospace,monospace;font-size:13px;line-height:1.6}.section-title{font-size:13px;font-weight:650;color:var(--text-dim);text-transform:uppercase;letter-spacing:.05em;margin:20px 0 10px}.tab-row{display:flex;gap:6px;padding:4px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm)}.tab{flex:1;padding:9px;border-radius:6px;font-size:14px;font-weight:550;color:var(--text-dim);transition:background .15s,color .15s}.tab-active{background:var(--bg-card);color:var(--text)}.tabbar{display:flex;border-top:1px solid var(--border);background:var(--bg-elevated);padding-bottom:var(--safe-bottom)}.tabbar-item{flex:1;display:grid;place-items:center;gap:2px;padding:10px 4px;font-size:10px;color:var(--text-faint);text-decoration:none}.tabbar-item-active{color:var(--accent)}.tabbar-icon{font-size:19px}