:root{--paper: #f7f8f3;--paper-deep: #eef1e8;--ink: #1e2927;--muted: #7d8880;--line: #dfe5dc;--teal: #0b776c;--teal-dark: #075a52;--mint: #d8eee7;--coral: #ed775d;--yellow: #f3d768;--shadow: 0 20px 50px rgba(42, 67, 57, .08);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,sans-serif;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0;min-width:320px;background:var(--paper)}button,input{font:inherit}button{cursor:pointer}.app-shell{display:grid;grid-template-columns:248px minmax(0,1fr);min-height:100vh;--page-bg: #f7f8f3;--sidebar-bg: #edf1e9;--page-line: rgba(11, 119, 108, .035);background-color:var(--page-bg);transition:background-color .6s ease}.app-shell.books-theme{--paper: #fbf7eb;--paper-deep: #f4ead0;--ink: #302c21;--muted: #8f836c;--line: #e5dbc3;--teal: #bd8b2f;--teal-dark: #8f6721;--mint: #f2e5bc;--coral: #c06b51;--yellow: #ebc95d;--page-bg: #fbf7eb;--sidebar-bg: #f2ead9;--page-line: rgba(189, 139, 47, .04);--theme-border: #e4ca8c;--theme-soft: #fff8e5;--theme-soft-strong: #f6e8ba}.app-shell.music-theme{--paper: #f7f8f3;--paper-deep: #eef1e8;--ink: #1e2927;--muted: #7d8880;--line: #dfe5dc;--teal: #0b776c;--teal-dark: #075a52;--mint: #d8eee7;--coral: #ed775d;--yellow: #f3d768;--page-bg: #f7f8f3;--sidebar-bg: #edf1e9;--page-line: rgba(11, 119, 108, .04);--theme-border: #b9d8cb;--theme-soft: #e8f3ed;--theme-soft-strong: #d8eee7}.sidebar{background:var(--sidebar-bg);transition:background-color .6s ease;border-right:1px solid var(--line);padding:28px 18px 24px;display:flex;flex-direction:column}.brand,.mobile-brand{display:flex;align-items:center;gap:11px}.brand-mark{display:grid;place-items:center;width:35px;height:35px;border-radius:10px;background:var(--teal);color:#fff;font-size:11px;letter-spacing:.05em;font-weight:800;box-shadow:4px 5px #b7d8cc}.brand strong{display:block;font-size:15px;letter-spacing:-.02em}.brand 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18px;width:18px;height:17px;perspective:52px;color:currentColor}.mode-book-icon:after{position:absolute;top:2px;left:8px;z-index:4;width:1px;height:13px;border-radius:1px;background:currentColor;opacity:.48;content:""}.mode-book-page{position:absolute;top:2px;width:8px;height:13px;border:1px solid currentColor;background:linear-gradient(105deg,rgba(255,255,255,.96) 0 42%,var(--theme-soft) 43% 100%);box-shadow:inset 1px 0 #ffffffb3,1px 2px 0 var(--theme-border);backface-visibility:visible;transform-style:preserve-3d}.mode-book-page:after{position:absolute;top:3px;right:1px;left:1px;height:1px;background:currentColor;box-shadow:0 3px currentColor,0 6px currentColor;content:"";opacity:.2}.mode-book-page-left{left:0;border-radius:3px 0 0 3px;transform:skewY(-5deg);transform-origin:right center}.mode-book-page-right{right:0;border-radius:0 3px 3px 0;transform:skewY(5deg);transform-origin:left center}.mode-book-page-turn{left:9px;z-index:2;border-radius:0 3px 3px 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