:root{--green:#1a5c3a;--green-light:#e8f2ec;--bg:#f5f7f5;--card:#fff;--text:#1f2a24;--muted:#6b7a71;--border:#e0e7e2;--danger:#b42318;--correct:#067647;--warning-bg:#fff6e6;--warning-text:#8a5300;--radius:14px;--nav-h:64px;--safe-bottom:env(safe-area-inset-bottom,0px)}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}.app-shell{min-height:100dvh}.main-content{padding:16px 16px calc(var(--nav-h) + var(--safe-bottom) + 24px);max-width:720px;margin:0 auto}.page{display:flex;flex-direction:column;gap:14px}.page-header h1{font-size:1.45rem;margin:8px 0 4px}.back-link{color:var(--green);text-decoration:none;font-size:.9rem}.hint{color:var(--muted);font-size:.82rem;margin:4px 0}.warning{background:var(--warning-bg);color:var(--warning-text);padding:10px 12px;border-radius:10px;font-size:.85rem}.empty{color:var(--muted);font-size:.9rem;padding:12px 0}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px}.card h2{font-size:1rem;margin:0 0 12px}.row-between{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:6px 0;font-size:.9rem}.goal-card{background:var(--green-light);border-color:transparent}.goal-row{display:flex;justify-content:space-between;font-size:.9rem}.progress-bar{height:8px;background:#1a5c3a26;border-radius:99px;overflow:hidden;margin:10px 0 6px}.progress-fill{height:100%;background:var(--green);border-radius:99px;transition:width .3s}.task-list{display:flex;flex-direction:column;gap:2px}.task-item{display:flex;gap:12px;align-items:flex-start;padding:12px 0;text-decoration:none;color:var(--text);border-bottom:1px solid var(--border)}.task-item:last-child{border-bottom:none}.task-dot{width:10px;height:10px;border-radius:50%;background:var(--green);margin-top:8px;flex-shrink:0}.task-item small{display:block;color:var(--muted);font-size:.8rem;margin-top:2px}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.stat-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px 10px;text-align:center;display:flex;flex-direction:column;gap:2px}.stat-num{font-size:1.35rem;font-weight:700;color:var(--green)}.stat-label{font-size:.72rem;color:var(--muted)}.btn{border:none;border-radius:12px;padding:12px 16px;font-size:1rem;cursor:pointer;text-align:center;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px;font-family:inherit}.btn-primary{background:var(--green);color:#fff}.btn-secondary{background:var(--green-light);color:var(--green)}.btn-danger{background:#fde8e6;color:var(--danger)}.btn-large{width:100%;padding:16px;font-size:1.05rem;font-weight:600}.btn-small{padding:8px 12px;font-size:.85rem}.btn-tiny{padding:6px 10px;font-size:.78rem;border-radius:8px;background:var(--green-light);color:var(--green)}.action-stack{display:flex;flex-direction:column;gap:10px}.sentence-card{border-bottom:1px solid var(--border);padding:12px 0}.sentence-card:last-child{border-bottom:none}.sentence-de{font-size:1.05rem;font-weight:600;color:var(--text)}.sentence-de.big{font-size:1.3rem}.sentence-zh{font-size:.92rem;color:var(--muted);margin-top:2px}.sentence-zh.big{font-size:1rem}.sentence-note{font-size:.82rem;color:var(--muted);background:var(--bg);border-radius:8px;padding:6px 10px;margin-top:6px}.sentence-actions{margin-top:6px}.hidden-text{color:var(--muted);font-style:italic}.vocab-chips{display:flex;flex-wrap:wrap;gap:8px}.chip{background:var(--bg);border-radius:99px;padding:6px 12px;font-size:.82rem}.dialogue-line{display:flex;gap:10px;padding:8px 0;border-bottom:1px solid var(--border)}.dialogue-line:last-child{border-bottom:none}.speaker{font-size:.75rem;background:var(--green-light);color:var(--green);border-radius:6px;padding:2px 8px;height:fit-content;flex-shrink:0}.quiz-card{border-bottom:1px solid var(--border);padding:12px 0}.quiz-card:last-child{border-bottom:none}.quiz-question{font-weight:600;margin:0 0 8px;font-size:.95rem}.choice{display:flex;gap:8px;align-items:center;padding:10px;border:1px solid var(--border);border-radius:10px;margin-bottom:6px;font-size:.9rem;cursor:pointer}.choice.correct{border-color:var(--correct);background:#edf7f0}.choice.wrong{border-color:var(--danger);background:#fdf0ef}.choice input{accent-color:var(--green)}.text-input{width:100%;padding:12px;border:1px solid var(--border);border-radius:10px;font-size:1rem;font-family:inherit;background:var(--card)}.feedback{font-size:.85rem;margin-top:8px}.correct-text{color:var(--correct)}.wrong-text{color:var(--danger)}.rating-row{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}.rating-btn{flex:1 1 auto;min-width:64px;padding:10px 8px;border:1px solid var(--border);background:var(--card);border-radius:10px;font-size:.8rem;cursor:pointer;font-family:inherit}.rating-btn.active{background:var(--green);color:#fff;border-color:var(--green)}.lesson-row{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--border);text-decoration:none;color:var(--text)}.lesson-row:last-child{border-bottom:none}.lesson-row.done{opacity:.75}.lesson-row small{display:block;color:var(--muted);font-size:.8rem}.badge{background:var(--bg);color:var(--muted);border-radius:99px;padding:3px 10px;font-size:.72rem;white-space:nowrap}.badge-done{background:var(--green-light);color:var(--green)}.vocab-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px;margin-bottom:10px}.vocab-head{display:flex;justify-content:space-between;align-items:flex-start}.vocab-de{font-size:1.1rem}.vocab-plural{color:var(--muted);font-size:.78rem;margin-left:6px}.vocab-zh{margin:4px 0 8px}.fav-btn{background:none;border:none;font-size:1.4rem;cursor:pointer;color:#c9a227;padding:0 4px}.vocab-actions{display:flex;gap:8px;margin-bottom:4px}.tag-row{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px}.tag{border:1px solid var(--border);background:var(--card);border-radius:99px;padding:7px 14px;font-size:.82rem;white-space:nowrap;cursor:pointer;font-family:inherit}.tag.active{background:var(--green);color:#fff;border-color:var(--green)}.speaking-card{text-align:center}.speaking-progress{font-size:.8rem;color:var(--muted);margin-bottom:12px}.speaking-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:12px}.speaking-nav{display:flex;justify-content:space-between;margin-top:16px;gap:10px}.mistake-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px;margin-bottom:10px}.answer-box{background:var(--bg);border-radius:10px;padding:10px;margin-top:8px;font-size:.88rem}.mistake-actions{margin-top:10px}.session-row{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:10px 0;border-bottom:1px solid var(--border)}.session-row:last-child{border-bottom:none}.session-row small{display:block;color:var(--muted);font-size:.78rem}.bottom-nav{position:fixed;bottom:0;left:0;right:0;height:calc(var(--nav-h) + var(--safe-bottom));padding-bottom:var(--safe-bottom);background:var(--card);border-top:1px solid var(--border);display:flex;justify-content:space-around;align-items:center;z-index:50}.bottom-nav a{text-decoration:none;color:var(--muted);font-size:.78rem;padding:8px 10px;border-radius:8px;min-width:52px;text-align:center}.bottom-nav a.active{color:var(--green);font-weight:600;background:var(--green-light)}.welcome{min-height:100dvh;padding:40px 24px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;max-width:480px;margin:0 auto}.welcome-icon{width:72px;height:72px;border-radius:20px;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700;margin-bottom:20px}.welcome h1{margin:0 0 12px;font-size:1.8rem;line-height:1.3}.welcome-lead{color:var(--muted);margin:0 0 24px;font-size:1rem}.welcome-points{text-align:left;display:flex;flex-direction:column;gap:8px;margin-bottom:28px;font-size:.9rem;width:100%}.welcome-points div{background:var(--green-light);border-radius:10px;padding:10px 14px}.new-badge{display:inline-block;background:var(--green-light);color:var(--green);padding:3px 10px;border-radius:99px;font-size:.78rem}.loading{padding:40px;text-align:center;color:var(--muted)}@media(max-width:380px){.stats-grid{grid-template-columns:repeat(2,1fr)}}