:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--page:#fafaf7;--text:#2d342f;--muted:#61695f;--accent:#365844;--accent-hover:#264733;--highlight:#e8eee5;--line:#dedfd8;--error-bg:#f6eae4;--error-text:#8c4633;--reading-font:Georgia, "Times New Roman", serif;color:var(--text);background:var(--page);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{min-width:320px;margin:0}button,input{font:inherit}button{cursor:pointer}button,a,summary,input{-webkit-tap-highlight-color:transparent}:focus-visible{outline:2px solid var(--accent);outline-offset:3px}::selection{color:var(--text);background:#d7e2cd}.icon{flex:none;display:block}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.icon-button{width:44px;height:44px;color:var(--muted);background:0 0;border:0;border-radius:8px;flex:none;justify-content:center;align-items:center;padding:0;display:inline-flex}.back-link,.text-button{min-height:44px;color:var(--muted);background:0 0;border:0;justify-content:center;align-items:center;gap:6px;padding:6px 0;font-size:13px;text-decoration:none;display:inline-flex}.text-button{text-underline-offset:4px;text-decoration:underline}.page-state{width:min(100% - 40px,660px);margin:80px auto}.page-state h1{font-size:24px;font-weight:500}.page-state p{line-height:1.8}.account-page{overflow-wrap:anywhere}.account-actions{flex-wrap:wrap;gap:8px 24px;display:flex}.catalog-page{max-width:760px;padding:max(28px, env(safe-area-inset-top)) 20px max(28px, env(safe-area-inset-bottom));margin:0 auto}.catalog-header h1{margin:0;font-size:clamp(24px,4vw,32px);font-weight:600;line-height:1.4}.catalog-subtitle{color:var(--muted);margin:8px 0 0;font-size:13px}.resume-card{color:var(--accent);justify-content:space-between;align-items:center;gap:16px;margin:20px 0 0;padding:12px 0;text-decoration:none;display:flex}.resume-card>span{min-width:0}.resume-card strong{overflow-wrap:anywhere;margin-top:4px;font-size:16px;font-weight:500;line-height:1.5;display:block}.catalog-page>.unit-list{margin-top:24px}.unit-card{border-top:1px solid var(--line)}.unit-card:last-child{border-bottom:1px solid var(--line)}.unit-card summary{cursor:pointer;align-items:center;gap:12px;min-height:60px;padding:10px 0;list-style:none;display:flex}.unit-card summary::-webkit-details-marker{display:none}.unit-number{color:var(--muted);flex:none;font-size:12px}.unit-title{overflow-wrap:anywhere;flex:1;min-width:0;font-size:17px;font-weight:600;line-height:1.5}.unit-chevron{color:var(--muted);transition:transform .16s}.unit-card[open] .unit-chevron{transform:rotate(180deg)}.lesson-list{margin:0;padding:0 0 12px;list-style:none}.lesson-link{min-height:44px;color:inherit;border-radius:8px;align-items:center;gap:8px;margin:2px -8px;padding:10px 8px;text-decoration:none;display:flex}.lesson-link[aria-current=page]{background:var(--highlight)}.lesson-link-body{grid-template-columns:minmax(0,1fr) auto;align-items:baseline;gap:3px 12px;width:100%;min-width:0;display:grid}.lesson-section{color:var(--muted);font-size:12px;line-height:1.5;display:block}.lesson-link-body .lesson-section{grid-column:1/-1}.lesson-title{overflow-wrap:anywhere;font-size:16px;line-height:1.5}.lesson-meta{color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap;font-size:12px}.lesson-complete{color:var(--accent)}.lesson-complete .icon{width:16px;height:16px}.catalog-sidebar{display:none}.reader{flex-direction:column;width:min(100%,780px);height:100dvh;min-height:320px;margin:0 auto;padding:0 20px;display:flex}.reader-header{padding-top:max(4px, env(safe-area-inset-top));flex:none}.reader-navigation{justify-content:space-between;align-items:center;gap:12px;margin-bottom:10px;display:flex}.reader-navigation .text-button{text-decoration:none}.eyebrow{color:var(--muted);overflow-wrap:anywhere;margin:0 0 6px;font-size:12px;line-height:1.5}.lesson-heading h1{font-family:var(--reading-font);overflow-wrap:anywhere;margin:0;font-size:clamp(26px,4vw,34px);font-weight:400;line-height:1.2}.player{align-items:center;gap:16px;margin:12px 0 8px;display:flex}.play-button{background:var(--accent);color:#fff;border:0;border-radius:50%;flex:none;place-items:center;width:52px;height:52px;padding:0;transition:background .16s,transform .16s;display:grid}.play-button .icon{width:24px;height:24px}.play-button:active:not(:disabled){transform:scale(.96)}.play-button:disabled{opacity:.45;cursor:not-allowed}.player-details{flex:1;min-width:0}.player-caption{min-height:18px;color:var(--muted);justify-content:space-between;align-items:baseline;gap:8px;font-size:12px;display:flex}.player-time{white-space:nowrap;font-variant-numeric:tabular-nums}.progress-slider{appearance:none;cursor:pointer;width:100%;height:44px;color:var(--accent);background:0 0;border:0;border-radius:4px;margin:0;padding:0;display:block}.progress-slider::-webkit-slider-runnable-track{background:linear-gradient(to right, var(--accent) var(--progress), var(--line) var(--progress));border-radius:4px;height:4px}.progress-slider::-moz-range-track{background:var(--line);border-radius:4px;height:4px}.progress-slider::-moz-range-progress{background:var(--accent);border-radius:4px;height:4px}.progress-slider::-webkit-slider-thumb{appearance:none;background:var(--accent);border:0;border-radius:50%;width:14px;height:14px;margin-top:-5px}.progress-slider::-moz-range-thumb{background:var(--accent);border:0;border-radius:50%;width:14px;height:14px}.progress-slider:disabled{opacity:.45;cursor:not-allowed}.transcript-scroll{overscroll-behavior-y:contain;scrollbar-width:thin;scrollbar-color:var(--line) transparent;min-height:0;padding:12px 8px max(24px, env(safe-area-inset-bottom));flex:1;margin:0 -8px;overflow-y:auto}.transcript{margin:0}.transcript-block{margin:0 0 22px}.transcript-paragraph{font-family:var(--reading-font);margin:0;font-size:23px;line-height:1.75}.sentence{text-align:left;color:var(--text);font:inherit;overflow-wrap:anywhere;-webkit-box-decoration-break:clone;box-decoration-break:clone;background:0 0;border:0;border-radius:4px;padding:3px 0;display:inline;position:relative}.sentence,.word-entry{transition:color .16s ease-out,background-color .28s ease-out}.sentence-active{background:var(--highlight);color:var(--accent);transition-duration:.16s,.2s}.sentence:disabled{cursor:default}.reader-error{background:var(--error-bg);color:var(--error-text);border-radius:8px;flex-wrap:wrap;align-items:center;gap:4px 12px;margin:8px 0;padding:8px 12px;font-size:13px;line-height:1.6;display:flex}.reader-error .text-button{color:inherit}.storage-warning{z-index:20;bottom:max(12px, env(safe-area-inset-bottom));background:var(--error-bg);width:fit-content;max-width:calc(100% - 24px);color:var(--error-text);border-radius:8px;margin:auto;padding:12px 16px;font-size:13px;position:fixed;left:12px;right:12px}.instruction-block{color:var(--muted);margin-bottom:12px}.instruction-block summary{cursor:pointer;align-items:center;gap:6px;width:fit-content;min-height:44px;font-size:12px;list-style:none;display:flex}.instruction-block summary::-webkit-details-marker{display:none}.instruction-block summary .icon{width:16px;height:16px}.instruction-block[open] summary .icon{transform:rotate(180deg)}.instruction-block .transcript-paragraph{font-family:inherit;font-size:13px;line-height:1.8}.instruction-block .sentence{color:var(--muted)}.instruction-block .sentence-active{color:var(--accent)}.speaker-label{color:var(--muted);margin-bottom:4px;font-size:13px;font-weight:600;display:block}.transcript-dialogue .transcript-block:not(.instruction-block){border-left:2px solid var(--line);padding-left:12px}.word-entry{text-align:left;width:100%;color:var(--text);background:0 0;border:0;border-radius:8px;margin:0 0 6px;padding:14px 12px;display:block;position:relative}.word-entry.sentence-active{background:var(--highlight);color:var(--accent)}.word-entry-main{flex-wrap:wrap;align-items:baseline;gap:6px 16px;display:flex}.word-text{font-family:var(--reading-font);overflow-wrap:anywhere;font-size:26px}.word-phonetic{color:var(--muted);overflow-wrap:anywhere;font-family:Arial,sans-serif;font-size:16px}.word-meaning{color:var(--muted);margin-top:6px;font-size:14px;line-height:1.7;display:block}.word-repeat{color:var(--muted);margin-top:6px;font-size:12px;display:block}.meaning-toggle{border:1px solid var(--line);min-height:44px;color:var(--muted);background:0 0;border-radius:8px;margin:0 0 12px;padding:8px 12px;font-size:13px}.audio-only{text-align:center;min-height:0;color:var(--muted);flex:1;padding:28px 0;overflow-y:auto}.audio-only h2{color:var(--text);font-size:18px;font-weight:500}.audio-only p{font-size:14px;line-height:1.8}.textbook-dialog{border:1px solid var(--line);background:var(--page);width:min(1100px,100% - 16px);height:calc(100dvh - 20px);max-height:calc(100dvh - 20px);color:var(--text);border-radius:12px;padding:16px}.textbook-dialog[open]{flex-direction:column;display:flex}.textbook-dialog::backdrop{background:#1f302c88}.textbook-dialog header{flex:none;justify-content:space-between;align-items:center;gap:12px;display:flex}.textbook-dialog h2{margin:0;font-size:17px;font-weight:500}.textbook-dialog header p,.pdf-help{color:var(--muted);font-size:13px}.pdf-help{line-height:1.7}.pdf-help a{color:var(--accent);text-underline-offset:3px}.textbook-dialog object{background:var(--highlight);border:0;flex:1;width:100%;min-height:0}@media (hover:hover){.play-button:hover:not(:disabled){background:var(--accent-hover)}.lesson-link:hover,.icon-button:hover,.word-entry:hover:not(:disabled),.sentence:hover:not(:disabled){background:var(--highlight);color:var(--accent)}.back-link:hover,.text-button:hover,.resume-card:hover{color:var(--accent-hover)}}@media (width>=601px){.catalog-page{padding:48px 32px}.lesson-link-body{grid-template-columns:64px minmax(0,1fr) auto;gap:12px}.lesson-link-body .lesson-section{grid-column:auto}.reader{padding:0 44px}.reader-header{padding-top:max(12px, env(safe-area-inset-top))}.reader-navigation{margin-bottom:16px}.player{margin:18px 0 12px}.transcript-paragraph{font-size:25px}.textbook-dialog{width:min(1100px,100% - 32px);padding:20px 24px}}@media (width>=1100px){.reading-layout{grid-template-columns:280px minmax(0,1fr);max-width:1440px;margin:auto;display:grid}.reading-layout.sidebar-collapsed{grid-template-columns:64px minmax(0,1fr)}.catalog-sidebar{border-right:1px solid var(--line);scrollbar-width:thin;height:100dvh;padding:12px 20px 28px;display:block;position:relative;overflow-y:auto}.sidebar-collapsed .catalog-sidebar{padding:12px 10px}.sidebar-toggle{position:absolute;top:12px;right:10px}.sidebar-title{color:var(--muted);margin:12px 0 20px;font-size:14px}.catalog-sidebar .unit-title{font-size:15px}.catalog-sidebar .lesson-link-body{grid-template-columns:minmax(0,1fr) auto;gap:3px 8px}.catalog-sidebar .lesson-link-body .lesson-section{grid-column:1/-1}.catalog-sidebar .lesson-title{font-size:14px}.catalog-sidebar .lesson-meta{font-size:12px}.catalog-sidebar .lesson-complete{display:none}.reading-layout:not(.sidebar-collapsed) .reader-navigation .back-link{visibility:hidden;pointer-events:none}}@media (height<=550px){.reader-header{padding-top:env(safe-area-inset-top)}.reader-navigation{margin-bottom:0}.lesson-heading h1{font-size:24px}.player{margin:4px 0}}@media (prefers-reduced-motion:reduce){*,:before{transition:none!important}}