:root{--green:#28785c;--green-dark:#235a47;--ink:#273c33;--muted:#829087;--line:#e8ede7;--sage:#eff6ef;--english-size:24px}*{box-sizing:border-box}body{margin:0;background:#fcfdfb;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-text-size-adjust:100%;text-size-adjust:100%}button,input,textarea,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button{border:0;background:none;color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #9dcbb4;outline-offset:3px}svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.icon-library{position:absolute;width:0;height:0;overflow:hidden}.site-header{background:white;border-bottom:1px solid var(--line)}.header-inner{max-width:1160px;min-height:96px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:0 22px;gap:28px}.brand{text-decoration:none;display:flex;align-items:center;gap:12px;font-size:23px;font-weight:750;letter-spacing:1px;color:var(--green-dark)}.brand-mark{width:46px;height:46px;border-radius:14px;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}.brand-mark svg{width:26px;height:26px;stroke-width:1.6}.brand small{display:block;font-size:9px;letter-spacing:2.2px;font-weight:600;margin-top:4px;color:#93a398}nav{display:flex;align-self:stretch;gap:36px}.nav-item{position:relative;font-size:14px;color:#818b82;padding:0 5px}.nav-item.selected{color:var(--green);font-weight:650}.nav-item.selected:after{position:absolute;content:"";height:3px;bottom:0;left:5px;right:5px;background:var(--green);border-radius:3px 3px 0 0}.tiny-plus{font-size:18px;margin-left:8px}.help-button{display:flex;align-items:center;gap:7px;color:#8a958d;font-size:13px}.help-button svg{width:18px;height:18px}.page-wrap{max-width:1160px;margin:auto;padding:34px 22px 0}.page-eyebrow{display:flex;align-items:center;gap:8px;font-size:12px;letter-spacing:1px;color:#8a978e;margin-bottom:23px}.green-dot{height:6px;width:6px;border-radius:50%;background:#75a780}.lesson-hero{display:flex;align-items:center;justify-content:space-between;background:#edf5ec;border:1px solid #e4eee1;border-radius:20px;padding:30px 40px;margin-bottom:35px;min-height:222px;overflow:hidden}.hero-copy{position:relative;z-index:1;min-width:0}.lesson-tag{font-size:10px;font-weight:650;letter-spacing:2px;color:#6e9a77;margin-bottom:12px}h1{font-size:32px;font-weight:720;letter-spacing:1px;line-height:1.45;margin:0 0 14px;overflow-wrap:anywhere}.unit-line{display:flex;align-items:center;flex-wrap:wrap;gap:12px;font-size:14px;color:#47795c;line-height:1.6}.unit-divider{height:12px;width:1px;background:#c8d9c9}.unit-line span:last-child{font-size:12px}.hero-copy>p{font-size:13px;color:#889987;margin:16px 0 0}.hero-art{width:260px;flex:0 0 260px;margin:-5px -1px -15px 20px}.hero-art svg{width:100%;height:auto;stroke:none}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 298px;gap:30px;align-items:start}.list-toolbar{display:flex;justify-content:space-between;align-items:center;min-height:28px;margin-bottom:18px;gap:15px}.section-title{display:flex;align-items:center;gap:9px;flex-wrap:wrap}.section-title>svg{color:var(--green);width:19px;height:19px}.section-title h2{font-size:17px;margin:0;font-weight:650;letter-spacing:.5px}.tap-hint{font-size:11px;color:#9aa39a;margin-left:5px}.text-toggle{display:flex;align-items:center;gap:7px;font-size:11px;color:#7d8a7e;white-space:nowrap;padding:6px 0}.toggle-track{width:27px;height:16px;background:#6f9d7d;border-radius:12px;display:inline-flex;padding:3px;justify-content:flex-end}.toggle-track>span{display:block;width:10px;height:10px;background:white;border-radius:50%;box-shadow:0 1px 2px #0001}.text-toggle[aria-pressed=false] .toggle-track{justify-content:flex-start;background:#cbd2ca}.sentence-list{display:flex;flex-direction:column;gap:12px}.sentence-card{background:white;border:1px solid #e4eae1;border-radius:14px;position:relative;overflow:hidden;transition:background .2s,border-color .2s,box-shadow .2s}.sentence-card:hover{border-color:#a8c6b0}.sentence-card.active{background:#f1f8ef;border-color:#76aa82;box-shadow:0 2px 9px #6b976512}.sentence-card.active:before{content:"";width:4px;height:100%;position:absolute;left:0;top:0;background:#509663}.english-button{width:100%;display:flex;align-items:center;text-align:left;padding:23px 23px 6px;gap:18px;min-height:67px;touch-action:manipulation}.sentence-number{align-self:flex-start;font-size:12px;line-height:30px;color:#9ba89c;font-weight:600;min-width:22px;font-variant-numeric:tabular-nums}.english-text{flex:1;font-size:var(--english-size);font-family:"Trebuchet MS","Segoe UI",Arial,sans-serif;font-weight:550;line-height:1.55;color:#2f4438;overflow-wrap:anywhere;letter-spacing:.1px}.sentence-speaker{width:31px;height:31px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#a2b2a1;background:#f5f8f2;flex-shrink:0}.sentence-speaker svg{width:15px;height:15px}.active .sentence-speaker{color:white;background:#4b9567}.translation{margin:0;padding:0 60px 21px 63px;font-size:15px;line-height:1.8;color:#8b9689;overflow-wrap:anywhere}.translation.empty{font-size:12px;color:#a7afa5}.hide-translations .translation{display:none}.hide-translations .english-button{padding-bottom:23px}.english-button:active{background:#e7f2e4}.list-end{display:flex;align-items:center;justify-content:center;gap:9px;padding:29px 0;font-size:11px;color:#a5afa0;letter-spacing:1px}.list-end svg{width:14px;height:14px}.list-end>span{height:1px;width:33px;background:#e1e9dd}.practice-column{position:sticky;top:24px}.practice-card{background:white;border:1px solid var(--line);border-radius:16px;padding:25px 22px}.practice-heading{display:flex;align-items:center;gap:10px;margin-bottom:23px}.sun-icon{color:#d9a751;font-size:30px;line-height:1}.practice-heading h2{font-size:15px;letter-spacing:.5px;margin:0 0 7px}.practice-heading p{font-size:11px;color:#98a18f;margin:0}.primary-button{background:var(--green);color:#fff;border-radius:10px;padding:14px 20px;font-size:14px;display:inline-flex;justify-content:center;align-items:center;gap:8px;font-weight:600;min-height:48px;transition:background .2s}.primary-button:hover{background:#21694f}.primary-button:active{transform:translateY(1px)}.primary-button:disabled{opacity:.45;cursor:not-allowed}.primary-button svg{width:18px;height:18px}.auto-button{width:100%}.playback-status{font-size:11px;text-align:center;line-height:1.7;color:#99a393;min-height:45px;padding:12px 0 8px}.settings-block{padding-top:17px;margin-top:4px;border-top:1px solid #f0f2ec}.setting-label{display:flex;align-items:center;justify-content:space-between;font-size:12px;margin:0 0 12px;color:#637260}.setting-label>span{font-size:10px;color:#a0aa99}.segmented{display:flex;gap:5px;padding:4px;background:#f5f7f1;border-radius:9px}.segmented button{border-radius:6px;flex:1;font-size:12px;padding:8px 2px;color:#909a88}.segmented button.active{background:#fff;box-shadow:0 1px 4px #24452212;color:var(--green);font-weight:600}.voice-block{border:0;padding-top:22px}.voice-block select{max-width:100%;width:100%;font-size:12px;background:#fff;color:#6f7f68;border:1px solid #e7ebe1;border-radius:8px;min-height:38px;padding:7px 8px}.voice-note{font-size:10px;line-height:1.6;color:#a0a998;margin:7px 0 0}.font-setting{margin-top:16px;display:flex;align-items:center;justify-content:space-between;font-size:12px;color:#6c7c62}.font-setting>div{display:flex;align-items:center;gap:5px}.font-option{width:32px;height:32px;color:#9ca58f;border-radius:7px;border:1px solid #e8ece1;font-family:Georgia,serif;font-size:15px}.font-option.large{font-size:20px}.font-option.active{color:var(--green);border-color:#bed0b9;background:#f4f8ef}.progress-section{border-top:1px solid #eef1e8;margin-top:20px;padding-top:18px}.progress-section>div:first-child{display:flex;justify-content:space-between;color:#89947e;font-size:11px}.progress-section strong{font-size:11px;color:#6d8c60;font-weight:500}.progress-track{margin-top:11px;height:5px;border-radius:4px;background:#eef3e8;overflow:hidden}.progress-track>span{height:100%;width:0;display:block;background:#8cb17d;transition:width .3s}.make-card{margin-top:17px;background:#fbf7ee;border:1px solid #f0e9db;border-radius:14px;padding:20px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}.make-icon{display:flex;align-items:center;justify-content:center;width:31px;height:31px;background:#eee4cb;color:#aa8c51;border-radius:9px}.make-icon svg{width:18px;height:18px}.make-card h3{font-size:13px;margin:0 0 7px;color:#7d704f}.make-card p{font-size:10px;color:#ad9f7c;margin:0}.make-card>button{display:flex;align-items:center;justify-content:center;gap:25px;margin-top:5px;border:1px solid #e2d6bc;background:#fffcf5;width:100%;font-size:12px;padding:10px;border-radius:8px;color:#927b4e}.make-card>button svg{width:15px;height:15px}.share-button{display:flex;align-items:center;justify-content:center;gap:7px;width:100%;border:1px solid #e4eadd;border-radius:9px;padding:12px;font-size:12px;margin-top:14px;color:#75866b;background:white}.share-button svg{width:15px;height:15px}.little-note{font-size:11px;color:#a7b09e;line-height:1.9;text-align:center;margin-top:17px}footer{max-width:1116px;border-top:1px solid var(--line);margin:12px auto 0;padding:25px 0 30px;display:flex;justify-content:space-between;color:#a6afa0;font-size:11px}.footer-brand{color:#8c9d83;letter-spacing:1px}.mobile-player{display:none}.compatibility{font-size:13px;color:#8b683c;background:#fff7e9;border:1px solid #efdfc6;border-radius:10px;padding:13px 16px;margin-bottom:15px;line-height:1.8}.modal-layer{position:fixed;z-index:20;inset:0;background:#24392f66;display:flex;align-items:center;justify-content:center;padding:24px;overflow:auto;-webkit-overflow-scrolling:touch}.modal{background:#fff;border:1px solid #e3eade;border-radius:20px;padding:29px;width:100%;max-width:680px;max-height:calc(100vh - 48px);overflow:auto;box-shadow:0 25px 100px #19302422}.modal-header{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:24px}.modal-eyebrow{font-size:9px;font-weight:600;letter-spacing:1.8px;color:#81a081}.modal-header h2{font-size:23px;line-height:1.6;margin:5px 0 0;font-weight:650}.icon-button{width:36px;height:36px;background:#f4f7f1;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#96a18b}.icon-button svg{width:18px;height:18px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px;margin-bottom:22px}form label,.share-modal>label{display:block;font-size:13px;color:#6c7c63}input,textarea{width:100%;border:1px solid #dfe7d9;border-radius:9px;padding:12px;color:#344b35;background:#fcfdfb;line-height:1.7;font-size:16px}input{margin-top:8px}textarea{resize:vertical;min-height:100px}textarea::placeholder,input::placeholder{color:#acb4a7}.content-label{display:flex;justify-content:space-between;align-items:center}.content-label button{font-size:12px;color:var(--green);padding:0}.input-hint{font-size:12px;color:#99a08e;line-height:1.8;margin:9px 0 11px}#contentInput{min-height:230px;font-family:inherit}.editor-feedback{margin-top:8px;min-height:22px;font-size:12px;line-height:1.7;color:#79966e}.editor-feedback.error{color:#b56d4c}.form-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line);margin-top:13px;padding-top:20px}.form-actions>span{font-size:10px;color:#9fa795;max-width:230px;line-height:1.8}.share-modal{max-width:470px}.share-preview{display:flex;align-items:center;gap:12px;padding:20px;border-radius:12px;background:#eff6ea;margin-bottom:19px}.share-preview strong{font-size:15px;overflow-wrap:anywhere}.share-preview p{font-size:12px;color:#849678;margin:7px 0 0}.share-modal>p{font-size:13px;line-height:1.8;color:#8d997e}.share-modal>label{font-size:11px;margin:18px 0 8px}#shareUrl{font-size:12px;line-height:1.7;word-break:break-all;color:#829372}.copy-button{width:100%;margin-top:5px}.share-modal .share-small{font-size:11px;text-align:center}.share-modal .share-warning{font-size:11px;color:#b78147}.help-modal{max-width:520px}.help-steps{padding-left:24px}.help-steps li{padding:0 0 12px 5px;color:var(--green)}.help-steps strong{font-size:15px}.help-steps p,.help-note p{font-size:13px;line-height:1.9;color:#8e9b82;margin:8px 0}.help-note{padding:17px 19px;background:#f5f7f0;border-radius:12px}.help-note strong{font-size:13px;color:#758a65}.toast{position:fixed;bottom:38px;left:50%;transform:translateX(-50%);max-width:calc(100% - 40px);background:#284f3e;color:white;border-radius:10px;padding:13px 22px;z-index:40;font-size:13px;line-height:1.6;text-align:center;box-shadow:0 5px 24px #1a382825}.hidden{display:none!important}.noscript{text-align:center;padding:30px}.playing-bars{display:flex;align-items:center;gap:2px;height:16px}.playing-bars i{display:block;width:2px;height:6px;background:white;border-radius:2px;animation:pulse .8s infinite alternate}.playing-bars i:nth-child(2){height:13px;animation-delay:.25s}.playing-bars i:nth-child(3){height:9px;animation-delay:.5s}@keyframes pulse{to{height:3px}}@media(min-width:1500px){.page-wrap{padding-top:43px}.lesson-hero{margin-bottom:40px}.sentence-list{gap:14px}}
@media(max-width:900px){.header-inner{min-height:82px}.page-wrap{padding:26px 22px 0}.workspace{grid-template-columns:minmax(0,1fr) 264px;gap:22px}.practice-card{padding:21px 17px}.lesson-hero{padding:27px}.hero-art{width:205px;flex-basis:205px}.tap-hint{display:none}h1{font-size:29px}.english-button{padding:21px 18px 6px;gap:12px}.translation{padding-left:52px;padding-right:30px}.english-text{font-size:22px}footer{margin-left:22px;margin-right:22px}}
@media(max-width:700px){body{background:#fff;padding-bottom:85px;padding-bottom:calc(85px + env(safe-area-inset-bottom))}.header-inner{min-height:76px;padding:0 20px;gap:14px}.brand{font-size:20px;gap:9px;letter-spacing:.5px}.brand-mark{width:38px;height:38px;border-radius:12px}.brand-mark svg{width:23px;height:23px}.brand small{font-size:7px;letter-spacing:1.6px}.help-button{padding:7px}.help-button>span{display:none}nav{gap:17px}.nav-item{font-size:12px;padding:0}.tiny-plus{display:none}.nav-item.selected:after{left:0;right:0}.page-wrap{padding:23px 18px 0}.page-eyebrow{font-size:10px;letter-spacing:.6px;gap:7px;margin-bottom:18px}.lesson-hero{min-height:190px;padding:25px 23px;margin-bottom:27px;border-radius:16px;position:relative;align-items:flex-start}.hero-copy{width:100%}.lesson-tag{font-size:8px;letter-spacing:1.5px;margin-bottom:10px}h1{font-size:25px;letter-spacing:0;max-width:100%;line-height:1.5;margin-bottom:10px;padding-right:0}.unit-line{font-size:12px;gap:8px;max-width:100%}.unit-line span:last-child{font-size:10px}.hero-copy>p{font-size:11px;margin:15px 0 0}.hero-art{display:none}.workspace{display:flex;flex-direction:column;gap:23px}.reading-column{width:100%}.list-toolbar{margin-bottom:15px;gap:8px}.section-title{gap:6px}.section-title h2{font-size:16px}.section-title>svg{width:18px;height:18px}.text-toggle{font-size:11px}.sentence-list{gap:12px}.sentence-card{border-radius:12px}.english-button{padding:21px 16px 5px;gap:10px;min-height:65px}.sentence-number{font-size:11px;min-width:19px;line-height:32px}.english-text{font-size:var(--english-size);font-weight:550;line-height:1.55}.sentence-speaker{width:28px;height:28px;align-self:center}.translation{padding:0 44px 20px 45px;font-size:15px;line-height:1.8}.list-end{font-size:10px;letter-spacing:0;padding:27px 0 7px;gap:7px}.list-end>span{width:22px}.practice-column{position:static;display:block;width:100%}.practice-card{padding:22px}.practice-heading,.auto-button,.playback-status{display:none}.settings-block{margin:0;padding:0;border:0}.settings-block+.settings-block{margin-top:19px}.setting-label{font-size:13px}.segmented button{font-size:13px;padding:10px}.font-setting{margin-top:18px;font-size:13px}.voice-note{font-size:11px}.voice-block select{font-size:13px;min-height:42px}.progress-section{padding-top:17px}.make-card{padding:21px}.make-card h3{font-size:14px}.make-card p{font-size:11px}.make-card>button{font-size:13px;min-height:42px}.share-button,.little-note{display:none}footer{padding:25px 0 22px;margin-top:28px;font-size:10px}.mobile-player{position:fixed;z-index:10;bottom:0;left:0;right:0;background:#fffffff7;border-top:1px solid #e5ebdf;display:flex;align-items:center;gap:13px;padding:12px 18px;padding-bottom:12px;padding-bottom:calc(12px + env(safe-area-inset-bottom));box-shadow:0 -5px 20px #274b2410}.mobile-player .primary-button{min-width:138px;padding:12px 15px;min-height:44px;font-size:13px}.mobile-player>span{flex:1;font-size:11px;color:#98a18e;text-align:center}.mobile-share{width:38px;height:38px;display:flex;align-items:center;justify-content:center;color:#78936c;border:1px solid #e0e8d9;border-radius:10px}.mobile-share svg{width:18px;height:18px}.modal-layer{padding:15px;align-items:center}.modal{padding:22px 19px;max-height:calc(100vh - 30px);border-radius:16px}.modal-header{margin-bottom:20px}.modal-header h2{font-size:22px}.modal-eyebrow{font-size:8px}.form-grid{grid-template-columns:1fr;gap:15px;margin-bottom:20px}.form-actions{flex-direction:column;align-items:stretch;gap:13px}.form-actions>span{max-width:100%;font-size:11px}.form-actions .primary-button{width:100%}.toast{bottom:95px}.help-steps p,.help-note p{font-size:13px}.share-modal .share-small{font-size:10px}.share-preview{padding:16px}.compatibility{font-size:12px;padding:12px}.hide-translations .english-button{padding-bottom:21px}}
@media(max-width:360px){.header-inner{padding:0 15px;gap:8px}.brand{font-size:18px}.brand-mark{width:34px;height:34px}nav{gap:12px}.help-button{padding:2px}.page-wrap{padding-left:14px;padding-right:14px}.lesson-hero{padding:22px 18px}h1{font-size:23px}.english-button{padding-left:12px;padding-right:12px;gap:8px}.translation{padding-left:39px}.english-text{font-size:23px}.mobile-player{gap:8px;padding-left:14px;padding-right:14px}.mobile-player .primary-button{min-width:128px}.mobile-player>span{font-size:10px}}
/* Keep the reader's font-size choice at every responsive breakpoint. */
.voice-quickbar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:16px;padding:14px 16px;background:#f3f8ef;border:1px solid #e2ebdb;border-radius:12px}.voice-quickbar>div{min-width:0}.voice-quickbar>div>span{display:block;font-size:10px;color:#91a085;margin-bottom:5px}.voice-quickbar strong{display:block;font-size:12px;line-height:1.7;font-weight:550;color:#657f59;overflow-wrap:anywhere}.voice-quickbar>button{display:flex;align-items:center;gap:5px;white-space:nowrap;font-size:12px;color:var(--green);min-height:38px;padding:5px 0 5px 8px}.voice-quickbar>button svg{width:15px;height:15px}.voice-actions{display:flex;gap:10px;margin-top:8px}.voice-actions button{flex:1;border:1px solid #dce7d5;background:#f8fbf4;border-radius:7px;color:#6e8660;min-height:34px;font-size:11px}.voice-actions button:disabled{opacity:.5;cursor:not-allowed}.voice-modal{max-width:480px}.voice-intro{font-size:13px;line-height:1.9;color:#8a997e;margin:-6px 0 22px}.voice-form label{display:block;font-size:12px;color:#758668;margin:17px 0 9px}.voice-form select{width:100%;min-height:46px;max-width:100%;border:1px solid #dfe7d9;border-radius:9px;background:#fcfdfb;color:#496540;padding:10px;font-size:15px}.voice-form select:disabled{color:#9ca793;background:#f4f6f0}.voice-sample{background:#f2f7ed;border-radius:12px;padding:17px 19px;margin:23px 0 20px}.voice-sample>span{font-size:10px;color:#95a488}.voice-sample p{font-size:20px;font-weight:550;font-family:"Trebuchet MS",Arial,sans-serif;line-height:1.7;color:#4b6b41;margin:10px 0 7px}.voice-sample small{font-size:12px;color:#8c9d7e}.voice-modal-actions{display:flex;align-items:center;gap:15px}.voice-modal-actions .primary-button{flex:1}.voice-modal-actions>button:last-child{font-size:12px;color:#7b926b;min-height:44px;padding:8px}.voice-modal>.voice-note{font-size:12px;line-height:1.8;margin-top:16px;overflow-wrap:anywhere}.voice-limit{font-size:11px;line-height:1.9;color:#a0aa95;border-top:1px solid #e8eee0;padding-top:14px;margin:16px 0 0}@media(max-width:700px){.voice-quickbar{padding:12px 14px;margin-bottom:14px}.voice-quickbar strong{font-size:12px}.voice-quickbar>button{font-size:12px}.voice-form select{font-size:16px}.voice-actions button{min-height:40px;font-size:12px}.voice-sample p{font-size:20px}}
.english-text{font-size:var(--english-size)}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}