:root{--bg: #f5f7fb;--card: #ffffff;--ink: #1f2937;--muted: #6b7280;--line: #e5e7eb;--primary: #4f46e5;--primary-d: #4338ca;--accent: #0ea5a4;--good: #16a34a;--ok: #d97706;--bad: #dc2626;--shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 8px 24px rgba(15, 23, 42, .06)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:Segoe UI,system-ui,-apple-system,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--ink);line-height:1.55}.app{max-width:920px;margin:0 auto;padding:0 16px 48px}.app-header{position:sticky;top:0;z-index:10;background:var(--bg);padding-top:18px}.brand{display:flex;align-items:center;gap:14px;margin-bottom:16px}.brand-logo{font-size:34px;background:linear-gradient(135deg,var(--primary),var(--accent));width:56px;height:56px;display:grid;place-items:center;border-radius:16px;box-shadow:var(--shadow)}.brand h1{margin:0;font-size:22px}.brand p{margin:0;color:var(--muted);font-size:13px}.tabs{display:flex;gap:8px;background:#eef1f7;padding:6px;border-radius:14px}.tab{flex:1;border:none;background:transparent;padding:10px 12px;border-radius:10px;font-size:15px;cursor:pointer;color:var(--muted);display:flex;align-items:center;justify-content:center;gap:8px;transition:all .15s}.tab.active{background:var(--card);color:var(--primary);font-weight:600;box-shadow:var(--shadow)}.app-main{margin-top:22px}.page{animation:fade .2s ease}@keyframes fade{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}.lookup-bar{display:flex;gap:10px;margin-bottom:18px}.lookup-bar input{flex:1;padding:13px 16px;border:1px solid var(--line);border-radius:12px;font-size:15px;background:var(--card);outline:none}.lookup-bar input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51f}button{font-family:inherit}.lookup-bar button,.primary-btn{padding:13px 20px;border:none;background:var(--primary);color:#fff;font-size:15px;font-weight:600;border-radius:12px;cursor:pointer;transition:background .15s;white-space:nowrap}.lookup-bar button:hover,.primary-btn:hover{background:var(--primary-d)}.lookup-bar button:disabled,.primary-btn:disabled{opacity:.6;cursor:default}.error-banner{background:#fef2f2;color:var(--bad);border:1px solid #fecaca;padding:10px 14px;border-radius:10px;margin-bottom:14px;font-size:14px}.loading-card{background:var(--card);border:1px dashed var(--line);padding:22px;border-radius:14px;text-align:center;color:var(--muted);box-shadow:var(--shadow)}.empty{color:var(--muted);font-size:14px;padding:8px 0}.hint{color:var(--muted);font-size:14px;margin:0 0 16px}.hint.small{font-size:12px}.list-header{display:flex;align-items:baseline;justify-content:space-between;margin:4px 0 12px}.list-header h2{font-size:17px;margin:0}.count{color:var(--muted);font-size:13px}.vocab-row{background:var(--card);border:1px solid var(--line);border-radius:14px;margin-bottom:10px;overflow:hidden;box-shadow:var(--shadow)}.vocab-row-head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;cursor:pointer}.vocab-row-main{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}.vocab-row-main b{font-size:16px}.vocab-row-meaning{color:var(--muted);font-size:14px}.vocab-row-actions{display:flex;align-items:center;gap:10px}.icon-btn{border:none;background:transparent;cursor:pointer;font-size:15px;opacity:.65;padding:4px;border-radius:8px}.icon-btn:hover{opacity:1;background:#f3f4f6}.chevron{color:var(--muted);font-size:11px}.vocab-card{border-top:1px solid var(--line);padding:18px 18px 6px;background:#fbfcfe}.vocab-head{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}.vocab-head h2{margin:0;font-size:24px}.phonetic{color:var(--accent);font-size:15px}.phonetic.small{font-size:12px}.pos{display:flex;gap:6px}.pos-tag{background:#eef2ff;color:var(--primary);font-size:12px;padding:2px 8px;border-radius:6px}.meaning{margin:10px 0 4px}.meaning-cn{margin:0;font-size:16px;font-weight:500}.meaning-en{margin:4px 0 0;color:var(--muted);font-size:14px}.section{margin-top:18px}.section h3{font-size:14px;margin:0 0 8px;color:#374151}.examples{list-style:none;padding:0;margin:0;display:grid;gap:10px}.examples li{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 12px}.ex-en{margin:0;font-size:15px}.ex-cn{margin:3px 0 0;color:var(--muted);font-size:13px}.ex-scenario{display:inline-block;margin-top:6px;font-size:12px;color:var(--accent);background:#e6fffb;padding:1px 8px;border-radius:6px}.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:5px 12px;font-size:13px;display:inline-flex;align-items:baseline;gap:6px}.chip em{color:var(--muted);font-style:normal;font-size:12px}.chip.simple{background:#f3f4f6}.wordnote-group{display:flex;align-items:flex-start;gap:10px;margin-bottom:8px}.wordnote-title{font-size:13px;color:var(--muted);min-width:48px;padding-top:6px}.etymology{margin:0;font-size:14px;color:#374151}.section.tip{background:#fffbeb;border:1px solid #fde68a;border-radius:12px;padding:12px 14px;margin-bottom:14px}.section.tip h3{color:#b45309}.section.tip p{margin:0;font-size:14px}.speaking-setup h2{font-size:19px;margin:0 0 6px}.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px;margin-bottom:18px}.topic-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 14px;font-size:15px;cursor:pointer;text-align:left;box-shadow:var(--shadow);transition:all .15s}.topic-card:hover{border-color:var(--primary)}.topic-card.active{border-color:var(--primary);background:#eef2ff;color:var(--primary);font-weight:600}.speaking-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}.topic-pill{background:#eef2ff;color:var(--primary);padding:6px 14px;border-radius:999px;font-size:14px;font-weight:600}.ghost-btn{border:1px solid var(--line);background:var(--card);color:var(--muted);padding:8px 14px;border-radius:10px;cursor:pointer;font-size:13px}.ghost-btn:hover{color:var(--ink)}.chat{display:flex;flex-direction:column;gap:14px;min-height:280px;margin-bottom:16px}.bubble-row{display:flex}.bubble-row.user{justify-content:flex-end}.bubble{max-width:80%;padding:12px 16px;border-radius:16px;box-shadow:var(--shadow)}.bubble.agent{background:var(--card);border:1px solid var(--line);border-bottom-left-radius:4px}.bubble.agent p{margin:0;font-size:15px}.bubble.user{background:var(--primary);color:#fff;border-bottom-right-radius:4px}.bubble.user.listening{background:#6366f1;opacity:.92}.bubble .said{margin:0;font-size:15px}.used-vocab{margin-top:8px;font-size:12px;color:var(--muted);display:flex;flex-wrap:wrap;align-items:center;gap:6px}.feedback{margin-top:10px;background:#ffffff29;border-radius:12px;padding:10px 12px;color:#fff}.feedback.perfect{background:#ffffff24}.feedback-top{display:flex;align-items:center;gap:8px;margin-bottom:6px}.score{font-size:12px;font-weight:700;padding:2px 8px;border-radius:6px;background:#fff}.score.good{color:var(--good)}.score.ok{color:var(--ok)}.score.bad{color:var(--bad)}.err-type{font-size:12px;background:#ffffff40;padding:2px 8px;border-radius:6px}.corrected{margin:4px 0;font-size:14.5px}.explain{margin:4px 0 0;font-size:13px;opacity:.95}.alts{margin-top:8px;font-size:13px}.alts ul{margin:4px 0 0;padding-left:18px}.status-line{text-align:center;color:var(--muted);font-size:13px}.mic-bar{position:sticky;bottom:0;padding:12px 0;background:linear-gradient(transparent,var(--bg) 30%);display:flex;justify-content:center}.mic-btn{border:none;background:var(--primary);color:#fff;font-size:16px;font-weight:600;padding:15px 28px;border-radius:999px;cursor:pointer;box-shadow:var(--shadow)}.mic-btn:disabled{opacity:.5;cursor:default}.mic-btn.recording{background:var(--bad);animation:pulse 1.2s infinite}@keyframes pulse{0%,to{box-shadow:0 0 #dc262666}50%{box-shadow:0 0 0 10px #dc262600}}.notes-page{display:grid;grid-template-columns:280px 1fr;gap:18px}.notes-sidebar{display:flex;flex-direction:column;gap:10px}.primary-btn{width:100%}.notes-list{display:flex;flex-direction:column;gap:8px;margin-top:6px}.note-item{display:flex;align-items:center;justify-content:space-between;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 12px;cursor:pointer;box-shadow:var(--shadow)}.note-item.active{border-color:var(--primary)}.note-item-main{display:flex;flex-direction:column}.note-item-main b{font-size:13.5px}.note-date{font-size:11px;color:var(--muted)}.note-view{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:8px 26px;min-height:420px;box-shadow:var(--shadow)}.empty-note{display:grid;place-items:center;min-height:380px;color:var(--muted)}.markdown{font-size:15px}.markdown h1{font-size:22px}.markdown h2{font-size:18px;border-bottom:1px solid var(--line);padding-bottom:6px;margin-top:26px}.markdown h3{font-size:15px}.markdown code{background:#f3f4f6;padding:1px 6px;border-radius:5px;font-size:13px}.markdown blockquote{border-left:3px solid var(--primary);margin:12px 0;padding:4px 14px;color:var(--muted)}.markdown table{border-collapse:collapse;width:100%}.markdown th,.markdown td{border:1px solid var(--line);padding:6px 10px;font-size:14px}@media(max-width:720px){.notes-page{grid-template-columns:1fr}.tab{font-size:14px}.tab span{display:none}}