:root{--curv-radius: 16px;--primary: #00bfff;--primary-light: #55c6f7;--primary-dark: #28a1d9;--accent: #72e3f4;--icon-color: #003473;--bg-dark: #0f0f0f;--bg-card: #1a1a1a;--bg-card-hover: #252525;--bg-hover: #333;--text-primary: #f5f5f5;--text-secondary: #a1a1aa;--text-muted: #71717a;--text-inverse: #ffffff;--border-subtle: #2a2a2a;--header-text: #ffffff;--header-shadow: 0 4px 20px rgba(58, 222, 237, .3);--surface-glow: radial-gradient( ellipse at top, rgba(124, 58, 237, .08) 0%, transparent 50% ), radial-gradient( ellipse at bottom right, rgba(244, 114, 182, .05) 0%, transparent 40% )}:root[data-theme=light],:root:not([data-theme=dark]):not([data-theme]){color-scheme:light;--bg-dark: #f5f5f5;--bg-card: #ffffff;--bg-card-hover: #f0f0f0;--bg-hover: #e5e5e5;--text-primary: #171717;--text-secondary: #525252;--text-muted: #a3a3a3;--text-inverse: #ffffff;--border-subtle: #e5e5e5;--header-shadow: 0 4px 20px rgba(58, 222, 237, .15);--surface-glow: none}@media(prefers-color-scheme:light){:root:not([data-theme]){color-scheme:light;--bg-dark: #f5f5f5;--bg-card: #ffffff;--bg-card-hover: #f0f0f0;--bg-hover: #e5e5e5;--text-primary: #171717;--text-secondary: #525252;--text-muted: #a3a3a3;--text-inverse: #ffffff;--border-subtle: #e5e5e5;--header-shadow: 0 4px 20px rgba(58, 222, 237, .15);--surface-glow: none}}header{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 50%,var(--accent) 100%);box-shadow:var(--header-shadow)}.curv-top-left{border-top-left-radius:var(--curv-radius)}.curv-top-right{border-top-right-radius:var(--curv-radius)}.curv-bottom-left{border-bottom-left-radius:var(--curv-radius)}.curv-bottom-right{border-bottom-right-radius:var(--curv-radius)}.curv-inner{border-radius:var(--curv-radius)}.curv-outer{border-radius:0}.curv-top{border-top-left-radius:var(--curv-radius);border-top-right-radius:var(--curv-radius)}.curv-bottom{border-bottom-left-radius:var(--curv-radius);border-bottom-right-radius:var(--curv-radius)}.curv-left{border-top-left-radius:var(--curv-radius);border-bottom-left-radius:var(--curv-radius)}.curv-right{border-top-right-radius:var(--curv-radius);border-bottom-right-radius:var(--curv-radius)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;height:100vh;display:flex;flex-direction:column;overflow:hidden;background-color:var(--bg-dark);color:var(--text-primary);user-select:none;-webkit-user-select:none}::-webkit-scrollbar{width:6px;background:transparent}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--primary);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--accent)}header{position:relative;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 50%,var(--accent) 100%);color:var(--header-text);box-shadow:var(--header-shadow);z-index:50;transition:transform .3s ease}header.hidden{transform:translateY(-100%)}.header-content{max-width:1024px;margin:0 auto;padding:.8rem 1rem;display:flex;justify-content:space-between;align-items:center}.title{display:flex;align-items:center;gap:.6rem;font-size:1.4rem;font-weight:700;letter-spacing:-.03em}.icon{width:26px;height:26px;background-color:var(--icon-color);-webkit-mask-image:var(--icon-book);mask-image:var(--icon-book);-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat;-webkit-mask-position:center;mask-position:center;-webkit-mask-size:contain;mask-size:contain}.btn-icon-upload{-webkit-mask-image:var(--icon-upload);mask-image:var(--icon-upload)}.btn-icon-settings{-webkit-mask-image:var(--icon-settings);mask-image:var(--icon-settings)}.btn-icon-list{-webkit-mask-image:var(--icon-list);mask-image:var(--icon-list)}.btn-icon-arrow-up{-webkit-mask-image:var(--icon-arrow-up);mask-image:var(--icon-arrow-up)}.icon-large{background-color:#fff;width:2rem;height:2rem;-webkit-mask-image:var(--icon-welcome);mask-image:var(--icon-welcome);-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat;-webkit-mask-position:center;mask-position:center;-webkit-mask-size:contain;mask-size:contain}.btn-icon{width:20px;height:20px;background-color:var(--icon-color);-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat;-webkit-mask-position:center;mask-position:center;-webkit-mask-size:contain;mask-size:contain}.app-name{display:none;background:linear-gradient(135deg,var(--text-inverse) 0%,rgba(255,255,255,.8) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.controls{display:flex;align-items:center;gap:.75rem}.page-count{font-size:.75rem;font-family:Courier New,monospace;color:#ffffffb3;display:none}.btn{background-color:#ffffff26;color:#fff;border:1px solid rgba(255,255,255,.2);padding:.5rem 1rem;border-radius:8px;cursor:pointer;font-size:.9rem;display:flex;align-items:center;gap:.5rem;transition:all .2s ease;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.btn:hover{background-color:#ffffff40;transform:translateY(-1px)}.btn-primary{background-color:var(--primary);border-color:transparent;box-shadow:0 2px 8px #7c3aed66}.btn-primary:hover{background-color:var(--primary-dark);box-shadow:0 4px 12px #7c3aed80}.btn-icon-only{padding:.5rem;background-color:transparent}.btn-icon-only:hover{background-color:#ffffff1a}.btn-large{padding:.75rem 1.5rem;font-size:1rem;margin-top:1rem}.btn-small{padding:.3rem .6rem;font-size:.75rem;background-color:var(--bg-card-hover);color:var(--text-secondary);border-color:var(--border-subtle)}.btn-small:hover{background-color:var(--bg-hover);color:var(--text-primary)}.btn-active{background-color:var(--primary);color:#fff;border-color:transparent}.file-input{display:none}.settings-panel{max-height:0;overflow:hidden;background-color:#0000004d;border-top:1px solid rgba(255,255,255,.1);transition:max-height .3s ease,padding .3s ease;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.settings-panel.open{max-height:200px;padding:1rem}.toc-panel{position:absolute;top:100%;right:1rem;width:280px;max-height:400px;background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--curv-radius);box-shadow:0 8px 32px #0006;overflow:hidden;opacity:0;visibility:hidden;transform:translateY(-10px);transition:all .2s ease;z-index:200}.toc-panel.open{opacity:1;visibility:visible;transform:translateY(0)}.toc-header{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;border-bottom:1px solid var(--border-subtle);font-weight:600;font-size:.875rem}.toc-list{max-height:340px;overflow-y:auto;padding:.5rem}.toc-item{display:block;width:100%;padding:.5rem .75rem;text-align:left;background:transparent;border:none;color:var(--text-secondary);font-size:.8rem;cursor:pointer;border-radius:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.toc-item:hover{background:var(--bg-card-hover);color:var(--text-primary)}.toc-item.current{background:var(--primary);color:#fff}.settings-grid{max-width:1024px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:1rem;font-size:.9rem}.setting-item{display:flex;justify-content:space-between;align-items:center}main{flex:1;overflow-y:auto;overflow-x:hidden;position:relative;outline:none;background-color:var(--bg-dark);background-image:var(--surface-glow)}.welcome-screen{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1.5rem;text-align:center;z-index:10}.welcome-screen.hidden{display:none}.welcome-card{background-color:var(--bg-card);padding:2rem 3rem;border:1px solid var(--border-subtle);max-width:20rem;width:100%;cursor:pointer;transition:all .3s ease;display:block;border:none;text-align:center;color:inherit;font:inherit;border-top-right-radius:var(--curv-radius);border-bottom-left-radius:var(--curv-radius)}.welcome-card:hover{border-color:var(--primary);background-color:var(--bg-card-hover)}.welcome-icon{width:3.5rem;height:3.5rem;background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 1rem}.icon-large{width:2rem;height:2rem}.welcome-card h2{font-size:1.35rem;font-weight:600;color:var(--text-primary);margin-bottom:.5rem;letter-spacing:-.02em}.welcome-card p{color:var(--text-secondary);font-size:.9rem;margin-bottom:1.5rem;line-height:1.5}.message{position:absolute;inset:0;display:none;flex-direction:column;align-items:center;justify-content:center;z-index:20;background-color:var(--bg-dark);opacity:.95}.message.show{display:flex}.loader{border:3px solid rgba(58,147,237,.2);border-top:3px solid var(--primary);border-radius:50%;width:40px;height:40px;animation:spin 1s linear infinite;margin-bottom:1rem}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.message p{color:var(--accent);font-family:Courier New,monospace;font-size:.875rem;animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.reader-container{min-height:100%;max-width:1024px;margin:0 auto;padding-bottom:5rem;width:100%;transition:all .3s ease;background-color:var(--bg-dark)}.reader-container img{display:block;margin:0 auto;max-width:100%;width:100%}.scroll-top{position:fixed;bottom:1.5rem;right:1.5rem;background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);padding:.75rem;box-shadow:0 4px 16px #3a93ed66;opacity:0;pointer-events:none;transition:all .3s ease;border:none;cursor:pointer;z-index:30;color:#fff;border-radius:50%}.scroll-top:hover{transform:translateY(-2px);box-shadow:0 6px 20px #3a93ed80}.scroll-top.visible{opacity:1;pointer-events:auto}body.dragging:before{content:"";position:fixed;inset:0;background-color:#3a93ed26;border:3px dashed var(--primary);z-index:100;pointer-events:none;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}@media(min-width:640px){.app-name,.page-count{display:inline}}@media(max-width:768px){.header-content{padding:.6rem .8rem}.title{font-size:1.2rem}.btn{padding:.4rem .8rem;font-size:.8rem}.welcome-card{padding:1.5rem}.settings-grid{grid-template-columns:1fr}}