:root{--red:#ad2333;--dark-red:#891523;--gold:#e5a817;--ink:#19232d;--muted:#6c747a;--cream:#fbf8f1;--paper:#fffdf9;--line:#e9e3d8;--green:#2c7c63}*{box-sizing:border-box}body{margin:0;background:#f3efe7;color:var(--ink);font-family:"DM Sans",sans-serif}.app-shell{max-width:650px;min-height:100vh;margin:auto;background:var(--paper);padding-bottom:86px}.topbar{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 20px;border-bottom:1px solid #f0ece5;background:rgba(255,253,249,.94);position:sticky;z-index:3;top:0}.brand{display:flex;align-items:center;gap:9px;border:0;background:transparent;color:var(--ink);font-size:15px;cursor:pointer}.brand-dot{display:grid;place-items:center;width:32px;height:32px;background:var(--red);border-radius:50%;color:#fff;font-family:"Noto Sans SC";font-size:17px}.streak{background:#fff5d7;border:1px solid #f4df9d;border-radius:20px;padding:7px 10px;color:#865e03;font:600 12px "DM Sans"}.view{display:none;padding:26px 20px 20px}.view.active{display:block}.welcome-row,.section-title{display:flex;justify-content:space-between;align-items:center;gap:12px}.eyebrow{font-size:10px;letter-spacing:1.25px;font-weight:700;color:var(--red);margin:0 0 7px}.welcome-row h1,.lesson-heading h1{font-size:28px;letter-spacing:-1.1px;margin:0}.welcome-row h1 span{color:var(--red)}.level-pill{background:var(--ink);color:#fff;border-radius:15px;padding:8px 10px;font-size:11px}.level-pill b{color:#ffcf40;font-size:17px}.hero-card{margin:23px 0 14px;padding:24px 23px 20px;min-height:222px;overflow:hidden;position:relative;color:#fff;border-radius:20px;background:linear-gradient(135deg,#b6293b,#8b1626);box-shadow:0 13px 28px #9d223325}.hero-card>*{position:relative;z-index:1}.hero-card h2{font-size:23px;letter-spacing:-.7px;margin:6px 0}.hero-card p:not(.hero-kicker){font-size:14px;line-height:1.45;width:67%;opacity:.85;margin:0 0 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div{background:#eee9df;height:6px;flex:1;border-radius:5px;overflow:hidden}.lesson-meter i{height:100%;display:block;background:var(--gold);width:33%;transition:.3s}.learning-card,.quiz-card{border:1px solid var(--line);border-radius:20px;overflow:hidden;background:#fff}.hanzi-stage{min-height:230px;display:flex;align-items:center;justify-content:center;background:#fff8e8;position:relative}.hanzi-stage .hanzi{font:500 120px "Noto Sans SC";color:var(--ink)}.sound-btn{position:absolute;right:18px;bottom:16px;border:0;border-radius:50%;height:38px;width:38px;background:#fff;color:var(--red);font-size:18px;cursor:pointer;box-shadow:0 2px 8px #0001}.card-copy{padding:21px}.pinyin{color:var(--red);font-size:22px;font-weight:700;margin:0 0 3px}.meaning{font-size:19px;font-weight:600;margin:0 0 14px}.explanation{font-size:13px;line-height:1.6;color:var(--muted);margin:0}.memory-tip{margin:16px 0 0;padding:11px 12px;background:#f8f4ed;border-radius:9px;color:#655f57;font-size:12px;line-height:1.45}.next-row{display:flex;gap:10px;margin-top:15px}.secondary-btn{border:1px solid var(--line);background:white;border-radius:10px;padding:11px 13px;font:600 13px "DM Sans";cursor:pointer}.next-row .primary-btn{flex:1;background:var(--red);color:white}.example-box{padding:17px;background:#fff8e8}.example-box .example-hanzi{font:500 29px "Noto Sans SC";margin:0}.example-box p:last-child{font-size:12px;color:var(--muted);margin:5px 0 0}.review-status{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;font-weight:600;margin-bottom:13px}.quiz-top{text-align:center;padding:29px 20px 22px;background:#fff8e8}.quiz-prompt{color:var(--muted);font-size:13px;margin:0}.quiz-hanzi{font:500 98px "Noto Sans SC";margin:8px 0 0}.answers{padding:15px}.answer{width:100%;margin:6px 0;padding:13px;border-radius:10px;border:1px solid var(--line);background:#fff;text-align:left;font:600 14px "DM Sans";cursor:pointer}.answer:hover{border-color:#d8867e}.answer.correct{background:#e7f5ee;border-color:#7dc59f;color:#206346}.answer.wrong{background:#fbeceb;border-color:#e09a97;color:#a9322e}.quiz-result{text-align:center;padding:30px 20px}.quiz-result h2{margin:0 0 8px}.quiz-result p{color:var(--muted);font-size:14px;line-height:1.5}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:24px 0}.stats-grid div{border:1px solid var(--line);border-radius:13px;padding:15px 8px;background:#fff}.stats-grid b{font-size:24px;color:var(--red);display:block}.stats-grid span{font-size:10px;color:var(--muted);line-height:1.25}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:min(650px,100%);height:69px;display:flex;justify-content:space-around;padding:7px 10px 10px;background:#fffdf9eF;border-top:1px solid #ece8df;backdrop-filter:blur(8px);z-index:4}.nav-item{border:0;background:transparent;color:#84837d;font:500 10px "DM 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