:root{--teal: #0f766e;--teal-dark: #0b5d56;--teal-light: #d1fae5;--bg: #f8fafc;--card: #ffffff;--text: #0f172a;--muted: #64748b;--border: #e2e8f0;--amber: #d97706;--red: #dc2626;--green: #059669;--radius: 12px;--shadow: 0 1px 3px rgba(15, 23, 42, .08);--shadow-lg: 0 8px 24px rgba(15, 23, 42, .1)}*{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}a{color:var(--teal);text-decoration:none}.container{max-width:960px;margin:0 auto;padding:0 16px}.header{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.header-inner{display:flex;align-items:center;justify-content:space-between;height:56px}.brand{display:flex;align-items:center;gap:8px;font-weight:700;color:var(--text);font-size:17px}.brand-mark{width:30px;height:30px;border-radius:8px;background:var(--teal);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:16px}.nav{display:flex;gap:4px}.nav-link{padding:6px 12px;border-radius:8px;color:var(--muted);font-size:14px}.nav-link.active{background:var(--teal-light);color:var(--teal-dark);font-weight:600}.header-right{display:flex;align-items:center;gap:8px}.voice-select{border:1px solid var(--border);border-radius:8px;font-size:12px;padding:5px 6px;max-width:150px;font-family:inherit;background:#fff;color:var(--muted)}.hero{text-align:center;padding:48px 0 32px}.hero h1{font-size:30px;margin-bottom:12px}.hero-sub{color:var(--muted);max-width:560px;margin:0 auto 24px}.hero-stats{display:flex;gap:16px;justify-content:center;margin-bottom:24px;flex-wrap:wrap}.stat{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:12px 24px;min-width:110px;box-shadow:var(--shadow)}.stat b{display:block;font-size:24px;color:var(--teal-dark)}.stat span{font-size:13px;color:var(--muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;border-radius:10px;padding:10px 18px;font-size:15px;font-weight:600;cursor:pointer;transition:filter .15s,transform .05s;font-family:inherit}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--teal);color:#fff}.btn-primary:hover:not(:disabled){filter:brightness(1.08)}.btn-outline{background:#fff;color:var(--teal);border:1.5px solid var(--teal)}.btn-outline:hover:not(:disabled){background:var(--teal-light)}.btn-done{background:var(--green);color:#fff}.btn-block{width:100%;margin-top:20px}.btn-sm{padding:6px 10px;font-size:13px;border-radius:8px}.btn-play{width:44px;height:44px;border-radius:50%;font-size:15px}.section{margin:32px 0}.section-title{font-size:18px;margin-bottom:16px}.page-title{font-size:24px;margin:24px 0}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;display:block;color:inherit;transition:box-shadow .15s,transform .05s}.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.card-top{display:flex;align-items:center;gap:8px;margin-bottom:10px;flex-wrap:wrap}.card-title{font-size:16px;margin-bottom:4px;line-height:1.4}.card-sub{font-size:13px;color:var(--muted);margin-bottom:8px}.card-summary{font-size:13px;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-bottom{display:flex;align-items:center;gap:10px;margin-top:12px}.mini-progress{flex:1;height:6px;background:var(--border);border-radius:99px;overflow:hidden}.mini-progress-bar{height:100%;background:var(--teal);border-radius:99px}.mini-progress-label{font-size:12px;color:var(--muted);white-space:nowrap}.badge{display:inline-block;padding:2px 8px;border-radius:99px;font-size:12px;font-weight:600}.badge-ted{background:#fde68a;color:#92400e}.badge-article{background:#c7d2fe;color:#3730a3}.badge-difficulty{background:var(--teal-light);color:var(--teal-dark)}.badge-done{background:#d1fae5;color:var(--green)}.meta-time{font-size:12px;color:var(--muted);margin-left:auto}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:20px;flex-wrap:wrap}.tabs{display:flex;gap:8px}.tab{border:1px solid var(--border);background:#fff;border-radius:99px;padding:6px 14px;font-size:14px;cursor:pointer;color:var(--muted);font-family:inherit}.tab.active{background:var(--teal);color:#fff;border-color:var(--teal);font-weight:600}.search{border:1px solid var(--border);border-radius:99px;padding:8px 14px;font-size:14px;width:220px;max-width:100%;font-family:inherit}.search:focus{outline:2px solid var(--teal-light);border-color:var(--teal)}.page-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.add-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);max-width:640px}.add-field{margin-bottom:16px}.add-label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px;font-weight:600}.add-row{display:flex;gap:8px}.add-input{flex:1;border:1px solid var(--border);border-radius:8px;padding:9px 12px;font-size:14px;font-family:inherit;background:#fff}.add-input:focus,.add-textarea:focus{outline:2px solid var(--teal-light);border-color:var(--teal)}.add-textarea{width:100%;border:1px solid var(--border);border-radius:8px;padding:10px 12px;font-size:14px;font-family:inherit;resize:vertical}.add-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.add-preview{background:var(--bg);border:1px dashed var(--border);border-radius:10px;padding:12px;margin-bottom:16px}.add-preview-label{font-size:13px;color:var(--green);font-weight:600;margin-bottom:6px}.add-preview-box{font-size:13px;color:var(--muted);max-height:120px;overflow:hidden}.add-error{color:var(--red);font-size:13px;margin-bottom:12px}.method-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.method-steps{list-style-position:inside;padding-left:0}.method-steps li{padding:6px 0;border-bottom:1px dashed var(--border);font-size:14px}.method-steps li:last-child{border-bottom:none}.method-tip{margin-top:12px;font-size:13px;color:var(--muted)}.back-link{display:inline-block;margin:16px 0;font-size:14px;color:var(--muted)}.back-link:hover{color:var(--teal)}.detail-head{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px;box-shadow:var(--shadow)}.detail-title{font-size:22px;margin:8px 0 6px}.detail-sub{font-size:14px;color:var(--muted)}.source-link{color:var(--teal)}.detail-summary{margin-top:8px;font-size:14px;color:var(--muted)}.notice{background:#fffbeb;border:1px solid #fde68a;color:#92400e;border-radius:10px;padding:12px 14px;font-size:13px;margin-bottom:16px}.step-nav{display:flex;gap:6px;margin-bottom:20px;overflow-x:auto;padding-bottom:4px}.step-btn{flex:1;min-width:72px;border:1.5px solid var(--border);background:#fff;border-radius:10px;padding:8px 6px;cursor:pointer;text-align:center;font-family:inherit}.step-btn.active{border-color:var(--teal);background:var(--teal-light)}.step-btn.done .step-num{background:var(--green);color:#fff}.step-num{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:50%;background:var(--border);color:var(--muted);font-size:12px;font-weight:700;margin-bottom:2px}.step-label{display:block;font-size:12px;color:var(--muted)}.step-btn.active .step-label{color:var(--teal-dark);font-weight:600}.step-body{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.step-intro h3{margin-bottom:6px;font-size:18px}.step-intro p{color:var(--muted);font-size:14px;margin-bottom:16px}.muted{color:var(--muted);font-size:13px;margin-top:8px}.step-actions{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}.detail-actions{margin-top:16px;text-align:right}.player-panel{background:var(--teal-light);border-radius:var(--radius);padding:20px;display:flex;flex-direction:column;align-items:center;gap:8px;margin-bottom:8px}.tts-player{display:flex;align-items:center;gap:12px}.tts-player.compact{gap:6px}.rate-group{display:flex;gap:4px}.rate-btn{border:1px solid var(--border);background:#fff;border-radius:6px;padding:4px 8px;font-size:12px;cursor:pointer;color:var(--muted);font-family:inherit}.rate-btn.active{background:var(--teal);color:#fff;border-color:var(--teal)}.rate-select{border:1px solid var(--border);border-radius:6px;font-size:12px;padding:4px;font-family:inherit}.video-wrap{position:relative;width:100%;aspect-ratio:16 / 9;border-radius:var(--radius);overflow:hidden;background:#000;margin-bottom:8px}.video-frame{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;border:0}.video-hint{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;background:#000;z-index:1}.listen-counter{display:flex;align-items:center;gap:10px;margin:16px 0;justify-content:center}.counter-num{font-size:18px;font-weight:700;color:var(--teal-dark);min-width:40px}.counter-label{color:var(--muted);font-size:14px}.dictation-progress{margin-bottom:12px}.dictation-list{display:flex;flex-direction:column;gap:10px}.dict-row{border:1px solid var(--border);border-radius:10px;padding:10px 12px;background:#fff}.dict-row.playing{border-color:var(--teal);box-shadow:0 0 0 2px var(--teal-light)}.dict-row-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}.dict-idx{width:22px;height:22px;border-radius:50%;background:var(--teal);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}.dict-input{width:100%;border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-size:14px;font-family:inherit;resize:vertical;min-height:40px}.dict-input:focus{outline:2px solid var(--teal-light);border-color:var(--teal)}.compare-row{border:1px solid var(--border);border-radius:10px;padding:10px 12px;margin-bottom:10px;background:#fff}.compare-dict{display:flex;align-items:center;gap:10px;margin-bottom:6px}.compare-dict-text{font-size:14px;color:var(--muted)}.compare-orig{font-size:14px;line-height:1.8}.word-hit{color:var(--text)}.word-miss{color:var(--red);background:#fee2e2;border-radius:3px;padding:0 2px}.compare-marks{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}.err-tag{border:1px solid var(--border);background:#fff;border-radius:99px;padding:2px 10px;font-size:12px;cursor:pointer;color:var(--muted);font-family:inherit}.err-tag.active{background:var(--amber);color:#fff;border-color:var(--amber)}.shadow-list{display:flex;flex-direction:column;gap:8px}.shadow-row{display:flex;align-items:center;gap:10px;border:1px solid var(--border);border-radius:10px;padding:10px 12px;cursor:pointer;transition:background .15s}.shadow-row:hover{background:var(--bg)}.shadow-row.active{border-color:var(--teal)}.shadow-row.done{background:#f0fdf4;border-color:#bbf7d0}.shadow-main{flex:1;min-width:0}.shadow-text{font-size:14px;display:block}.shadow-controls{display:flex;align-items:center;gap:8px;flex-shrink:0}.recorder{display:inline-flex;align-items:center;margin-top:6px;flex-wrap:wrap;gap:8px}.recorder-rec{display:inline-flex;align-items:center;gap:8px}.recorder-req{font-size:12px;color:var(--muted)}.rec-dot{width:10px;height:10px;border-radius:50%;background:var(--red);animation:pulse 1s infinite;flex-shrink:0}@keyframes pulse{0%,to{opacity:1}50%{opacity:.35}}.live-meter{width:120px;height:32px;border-radius:6px;background:var(--bg);border:1px solid var(--border)}.recorder-done{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap}.rec-audio{height:34px;max-width:180px}.wave{display:inline-flex;align-items:center;gap:2px;height:40px}.wave-bar{width:3px;background:var(--teal);border-radius:2px}.rec-error{color:var(--red);font-size:12px}.recite-list{margin:16px 0}.recite-line{font-size:15px;line-height:1.8;letter-spacing:1px;margin-bottom:6px;color:var(--muted)}.recite-line.revealed{color:var(--text);letter-spacing:normal}.progress-list{display:flex;flex-direction:column;gap:8px}.progress-row{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:12px 14px;box-shadow:var(--shadow)}.progress-row-main{display:flex;align-items:center;gap:8px;flex:1;min-width:0}.progress-row-title{font-size:14px;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.progress-row-right{display:flex;align-items:center;gap:10px;width:140px;flex-shrink:0}.empty{text-align:center;padding:48px 0;color:var(--muted)}.footer{border-top:1px solid var(--border);margin-top:48px;padding:24px 0;text-align:center;color:var(--muted);font-size:13px}@media (max-width: 560px){.hero h1{font-size:24px}.brand-text{display:none}.toolbar{flex-direction:column;align-items:stretch}.search{width:100%}.progress-row{flex-direction:column;align-items:stretch}.progress-row-right{width:100%}.header-inner{gap:6px}.header-right{gap:4px}.voice-select{max-width:110px}.shadow-row{flex-wrap:wrap}.shadow-controls{flex-shrink:1}}.login{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:16px}.login-card{width:100%;max-width:320px;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:28px 24px;display:flex;flex-direction:column;gap:14px}.login-brand{justify-content:center;margin-bottom:6px}.login-input{border:1px solid var(--border);border-radius:8px;padding:10px 12px;font-size:16px;font-family:inherit}.login-input:focus{outline:2px solid var(--teal-light);border-color:var(--teal)}.login-error{color:var(--red);font-size:13px}.sync-dot{width:8px;height:8px;border-radius:50%;display:inline-block}.sync-ok{background:var(--green)}.sync-busy{background:var(--amber)}.sync-warn{background:var(--red)}.nav-button{background:none;border:none;cursor:pointer;font:inherit}.dict-stats{display:flex;gap:16px;font-size:13px;color:var(--muted);margin-bottom:6px}.dict-stats b{color:var(--text)}.dict-bar{height:4px;background:var(--border);border-radius:2px;overflow:hidden;margin-bottom:16px}.dict-bar>div{height:100%;background:var(--teal);transition:width .3s}.dict-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:12px}.dict-card-head{display:flex;align-items:center;gap:6px}.dict-attempts{margin-left:auto;font-size:12px}.dict-controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.kbd-tip{font-size:12px}kbd{font-family:inherit;font-size:11px;border:1px solid var(--border);border-bottom-width:2px;border-radius:4px;padding:0 5px;background:var(--bg)}.dictation .dict-input{font-size:16px;line-height:1.5;min-height:64px}.dict-actions{display:flex;gap:8px;flex-wrap:wrap}.dict-actions .btn-primary{margin-left:auto}.check-result{border-radius:10px;padding:12px 14px;background:#fef2f2;border:1px solid #fecaca}.check-result.perfect{background:#ecfdf5;border-color:#a7f3d0}.check-summary{font-weight:600;font-size:14px;margin-bottom:6px}.check-summary .muted{font-weight:400}.check-words{font-size:16px;line-height:1.9}.w-ok{color:var(--green)}.w-spell{color:var(--amber)}.w-wrong,.w-extra{color:var(--red)}.w-extra{text-decoration:line-through;opacity:.7}.w-missing{color:var(--red);letter-spacing:1px}.w-missing.revealed{letter-spacing:0;background:#fee2e2;border-radius:3px;padding:0 2px}.w-fix{color:var(--text);background:#fef3c7;border-radius:3px;padding:0 2px}.check-answer{margin-top:8px;padding-top:8px;border-top:1px dashed #fecaca;font-size:15px}.dict-grid{display:flex;flex-wrap:wrap;gap:4px;margin:16px 0}.dict-dot{width:30px;height:26px;border-radius:6px;border:1px solid var(--border);background:#fff;font-size:11px;color:var(--muted);cursor:pointer}.dict-dot.tried{background:#fef3c7;border-color:#fde68a;color:#92400e}.dict-dot.done{background:var(--teal-light);border-color:#6ee7b7;color:var(--teal-dark)}.dict-dot.revealed{background:#fee2e2;border-color:#fecaca;color:var(--red)}.dict-dot.current{outline:2px solid var(--teal);outline-offset:1px}.audio-full{width:100%}