:root{--text:#6b6375;--text-h:#08060d;--bg:#fff;--border:#e5e4e7;--code-bg:#f4f3ec;--accent:#aa3bff;--accent-bg:#aa3bff1a;--accent-border:#aa3bff80;--social-bg:#f4f3ec80;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}@media (width<=1024px){:root{font-size:16px}}@media (prefers-color-scheme:dark){:root{--text:#9ca3af;--text-h:#f3f4f6;--bg:#16171d;--border:#2e303a;--code-bg:#1f2028;--accent:#c084fc;--accent-bg:#c084fc26;--accent-border:#c084fc80;--social-bg:#2f303a80;--shadow:#0006 0 10px 15px -3px, #00000040 0 4px 6px -2px}#social .button-icon{filter:invert()brightness(2)}}#root{text-align:left;box-sizing:border-box;flex-direction:column;width:100%;max-width:100%;min-height:100svh;margin:0 auto;display:flex}body{margin:0}h1,h2{font-family:var(--heading);color:var(--text-h);font-weight:500}h1{letter-spacing:-1.68px;margin:32px 0;font-size:56px}@media (width<=1024px){h1{margin:20px 0;font-size:36px}}h2{letter-spacing:-.24px;margin:0 0 8px;font-size:24px;line-height:118%}@media (width<=1024px){h2{font-size:20px}}p{margin:0}code,.counter{font-family:var(--mono);color:var(--text-h);border-radius:4px;display:inline-flex}code{background:var(--code-bg);padding:4px 8px;font-size:15px;line-height:135%}.shelf-page{width:100%;max-width:680px;padding:24px 16px 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16px;font-size:14px}.home-settings-link{color:var(--accent);white-space:nowrap;border:1px solid var(--accent-border);border-radius:8px;padding:6px 12px;font-size:13px;text-decoration:none;transition:background .2s}.home-settings-link:hover{background:var(--accent-bg)}.chapter-list{flex-direction:column;gap:20px;display:flex}.chapter-card{border:1px solid var(--border);border-radius:16px;overflow:hidden}.chapter-title{color:var(--text-h);background:var(--code-bg);border-bottom:1px solid var(--border);letter-spacing:-.1px;margin:0;padding:14px 16px 12px;font-size:15px;font-weight:600}.lesson-grid{flex-direction:column;display:flex}.lesson-item{border-bottom:1px solid var(--border);align-items:center;gap:10px;padding:13px 16px;text-decoration:none;transition:background 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var(--border);background:var(--code-bg);color:var(--text-h);cursor:pointer;-webkit-tap-highlight-color:transparent;border-radius:10px;padding:9px 16px;font-size:13px;font-weight:500;transition:background .15s,border-color .15s}.deck-btn:hover:not(:disabled){background:var(--accent-bg);border-color:var(--accent-border);color:var(--accent)}.deck-btn:disabled{opacity:.25;cursor:default}.card-list{flex-direction:column;flex:1;gap:8px;min-height:0;display:flex;overflow:hidden}.card-list-search-row{align-items:center;gap:8px;display:flex}.card-list-search{border:1.5px solid var(--border);background:var(--code-bg);color:var(--text-h);border-radius:10px;flex:1;padding:9px 12px;font-size:14px;transition:border-color .2s}.card-list-search:focus{border-color:var(--accent);outline:none}.card-list-count{opacity:.45;white-space:nowrap;font-size:12px}.card-list-items{border:1px solid var(--border);-webkit-overflow-scrolling:touch;min-height:0;padding-bottom:env(safe-area-inset-bottom,8px);border-radius:14px;flex:1;overflow-y:auto}.card-list-item{text-align:left;border:none;border-bottom:1px solid var(--border);background:var(--bg);cursor:pointer;-webkit-tap-highlight-color:transparent;align-items:center;gap:10px;width:100%;padding:12px 14px;transition:background .12s;display:flex}.card-list-item.last{border-bottom:none}.card-list-item:active,.card-list-item:hover{background:var(--accent-bg)}.card-list-index{color:var(--accent);background:var(--accent-bg);border-radius:5px;flex-shrink:0;padding:2px 6px;font-size:11px;font-weight:700}.card-list-main{flex-direction:column;flex:1;gap:2px;min-width:0;display:flex}.card-list-reading{color:var(--text-h);white-space:nowrap;text-overflow:ellipsis;font-size:15px;font-weight:500;overflow:hidden}.card-list-zh{opacity:.6;white-space:nowrap;text-overflow:ellipsis;font-size:12px;overflow:hidden}.card-list-word{color:var(--text);opacity:.7;flex-shrink:0;font-size:14px}.lesson-page{padding:10px 12px 12px;padding-left:max(12px, env(safe-area-inset-left));padding-right:max(12px, env(safe-area-inset-right));padding-bottom:max(12px, env(safe-area-inset-bottom));box-sizing:border-box;flex-direction:column;gap:8px;width:100%;max-width:680px;height:100svh;margin:0 auto;display:flex;overflow:hidden}.lesson-page.list-mode{height:100svh;overflow:hidden}.lesson-topbar{align-items:center;gap:10px;min-height:36px;display:flex}.lesson-back-btn{color:var(--accent);flex-shrink:0;padding:4px 2px;font-size:20px;line-height:1;text-decoration:none}.lesson-topbar-title{color:var(--text-h);white-space:nowrap;text-overflow:ellipsis;font-size:15px;font-weight:600;overflow:hidden}.audio-row{display:flex}.audio-player{border-radius:8px;width:100%;height:32px}.audio-cache-btn{border:1.5px solid var(--accent-border);background:var(--accent-bg);width:32px;height:32px;color:var(--accent);cursor:pointer;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;font-size:14px;transition:opacity .15s;display:flex}.audio-cache-btn:disabled{opacity:.4;cursor:default}.audio-cache-btn.cached{color:#16a34a;background:#f0fdf4;border-color:#86efac}.lesson-error{color:#b91c1c;background:#fff2f2;border:1px solid #fca5a5;border-radius:10px;padding:10px 14px;font-size:13px}.list-header{justify-content:space-between;align-items:center;display:flex}.list-title{color:var(--text-h);font-size:14px;font-weight:600}.mode-switch-btn{border:1.5px solid var(--accent-border);background:var(--accent-bg);color:var(--accent);cursor:pointer;border-radius:8px;padding:5px 12px;font-size:12px;font-weight:500}.lesson-empty{opacity:.5;text-align:center;padding:24px 0;font-size:14px}.list-mode-container{flex-direction:column;flex:1;gap:8px;min-height:0;display:flex;overflow:hidden}.settings-page{width:100%;max-width:680px;padding:16px 16px 40px;padding-left:max(16px, env(safe-area-inset-left));padding-right:max(16px, env(safe-area-inset-right));box-sizing:border-box;flex-direction:column;gap:16px;margin:0 auto;display:flex}.settings-back a{color:var(--accent);opacity:.85;font-size:14px;text-decoration:none}.settings-back a:hover{opacity:1}.settings-title{color:var(--text-h);letter-spacing:-.3px;margin:0;font-size:22px;font-weight:700}.settings-section{border:1px solid var(--border);border-radius:16px;overflow:hidden}.settings-row{background:var(--bg);justify-content:space-between;align-items:center;gap:16px;padding:18px 20px;transition:background .15s;display:flex}.settings-row:not(:last-child){border-bottom:1px solid var(--border)}.settings-row-info{flex-direction:column;gap:4px;display:flex}.settings-row-label{color:var(--text-h);font-size:15px;font-weight:600}.settings-row-desc{opacity:.55;font-size:12px;line-height:1.5}.toggle-btn{background:var(--border);cursor:pointer;border:none;border-radius:14px;flex-shrink:0;width:48px;height:28px;padding:0;transition:background .25s;position:relative}.toggle-btn.on{background:var(--accent)}.toggle-thumb{background:#fff;border-radius:50%;width:22px;height:22px;transition:transform .25s cubic-bezier(.4,0,.2,1);display:block;position:absolute;top:3px;left:3px;box-shadow:0 1px 4px #0003}.toggle-btn.on .toggle-thumb{transform:translate(20px)}