:root{--sidebar-width: 280px;--header-height: 60px;--bg-color: #fdfbf7;--text-color: #2c2c2c;--sidebar-bg: #f4f1ea;--sidebar-border: #e0e0e0;--accent-color: #d35400;--code-bg: #eae8e1}@media(prefers-color-scheme:dark){:root{--bg-color: #1a1a1a;--text-color: #e0e0e0;--sidebar-bg: #141414;--sidebar-border: #333333;--accent-color: #e67e22;--code-bg: #2a2a2a}}body{margin:0;font-family:Georgia,serif;background-color:var(--bg-color);color:var(--text-color);transition:background-color .3s ease,color .3s ease;letter-spacing:.7px}.app-container{display:flex;min-height:100vh}a{color:var(--accent-color);text-decoration:none}a:hover{text-decoration:underline}.mobile-header{display:none;position:fixed;top:0;left:0;right:0;height:var(--header-height);background:var(--bg-color);border-bottom:1px solid var(--sidebar-border);align-items:center;padding:0 1rem;z-index:100;justify-content:space-between}.mobile-title{font-weight:700;font-family:system-ui,sans-serif;font-size:.9rem}.menu-toggle{background:none;border:1px solid var(--sidebar-border);color:var(--text-color);font-size:.9rem;padding:.4rem .8rem;border-radius:4px;cursor:pointer}.sidebar{width:var(--sidebar-width);height:100vh;position:sticky;top:0;padding:2rem;background:var(--sidebar-bg);border-right:1px solid var(--sidebar-border);overflow-y:auto;flex-shrink:0;font-family:system-ui,sans-serif;transition:transform .3s ease;z-index:200}.sidebar h3{margin-top:0;font-size:.75rem;text-transform:uppercase;letter-spacing:1.5px;opacity:.6}.sidebar ul{list-style:none;padding:0}.sidebar button{background:none;border:none;cursor:pointer;text-align:left;padding:.6rem 0;color:var(--text-color);opacity:.7;width:100%;font-size:.95rem}.sidebar button:hover{opacity:1}.sidebar button.active{opacity:1;font-weight:700;color:var(--accent-color)}.reader-view{flex:1;padding:4rem 10%;max-width:750px;margin:0 auto}.chapter-content h1{font-size:2.5rem;margin-bottom:.5rem;line-height:1.1}.chapter-content h2{font-size:1.5rem;margin-top:2.5rem;margin-bottom:1rem}.chapter-content h3{font-size:1.2rem;margin-top:2rem;font-style:italic}.chapter-content p{margin-bottom:1.5rem;line-height:1.7;font-size:1.125rem}.chapter-content blockquote{border-left:3px solid var(--accent-color);padding-left:1.2rem;margin:2rem 0;font-style:italic;opacity:.85;background:var(--sidebar-bg);padding:1rem}.chapter-content img{max-width:100%;height:auto;border-radius:2px;margin:2rem 0;display:block}@media(max-width:768px){.app-container{flex-direction:column;padding-top:var(--header-height)}.mobile-header{display:flex}.sidebar{position:fixed;left:0;top:var(--header-height);bottom:0;width:85%;max-width:300px;transform:translate(-100%);box-shadow:2px 0 10px #0003}.sidebar.open{transform:translate(0)}.backdrop{position:fixed;inset:0;background:#00000080;z-index:150;backdrop-filter:blur(2px)}.reader-view{padding:2rem 1.5rem}.chapter-content h1{font-size:2rem}}