:root{--bg-primary: #ffffff;--bg-secondary: #f8f9fa;--bg-tertiary: #f1f3f4;--text-primary: #1d1d1d;--text-secondary: #5f6368;--text-muted: #9aa0a6;--border-color: #dadce0;--border-light: #e8eaed;--accent-primary: #FF8B8B;--accent-secondary: #FF6B6B;--accent-glow: rgba(255, 139, 139, .15);--accent-rgb: 255, 139, 139;--error: #FF8B8B;--error-bg: rgba(255, 139, 139, .1);--warning: #FFD93D;--warning-bg: rgba(255, 217, 61, .1);--success: #88D8B0;--success-bg: rgba(136, 216, 176, .1);--info: #87CEEB;--info-bg: rgba(135, 206, 235, .1);--font-display: "Space Grotesk", sans-serif;--font-mono: "JetBrains Mono", monospace;--container-max-width: 720px;--container-padding: 3rem 1.5rem;--section-gap: 1.5rem;--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 3rem;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-medium: .3s cubic-bezier(.4, 0, .2, 1);--transition-slow: .5s cubic-bezier(.4, 0, .2, 1);--stack-gap: 1.5rem;--grid-gap: 1rem;--cluster-gap: .75rem;--sidebar-width: 280px}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-display);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6;position:relative;overflow-x:hidden}::selection{background:var(--accent-primary);color:var(--bg-primary)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}body:before{content:"";position:fixed;top:0;left:0;right:0;bottom:0;background-color:var(--bg-primary);background-image:repeating-linear-gradient(0deg,transparent,transparent 19px,rgba(var(--accent-rgb),.15) 19px,rgba(var(--accent-rgb),.15) 20px),repeating-linear-gradient(90deg,transparent,transparent 19px,rgba(var(--accent-rgb),.15) 19px,rgba(var(--accent-rgb),.15) 20px),repeating-linear-gradient(0deg,transparent,transparent 9px,rgba(var(--accent-rgb),.08) 9px,rgba(var(--accent-rgb),.08) 10px),repeating-linear-gradient(90deg,transparent,transparent 9px,rgba(var(--accent-rgb),.08) 9px,rgba(var(--accent-rgb),.08) 10px);background-size:40px 40px;opacity:.8;pointer-events:none;z-index:0}.l-container{position:relative;z-index:2;max-width:var(--container-max-width);margin:0 auto;padding:var(--container-padding);min-height:100vh;display:flex;flex-direction:column}.l-container--narrow{--container-max-width: 680px}.l-container--wide{--container-max-width: 1200px}.l-container--full{--container-max-width: 100%}.l-stack{display:flex;flex-direction:column;gap:var(--stack-gap)}.l-stack--tight{--stack-gap: .75rem}.l-stack--loose{--stack-gap: 2rem}.l-stack--extra-loose{--stack-gap: 3rem}.l-grid{display:grid;gap:var(--grid-gap)}.l-grid--2col{grid-template-columns:repeat(2,1fr)}.l-grid--3col{grid-template-columns:repeat(3,1fr)}.l-grid--4col{grid-template-columns:repeat(4,1fr)}.l-grid--sidebar{grid-template-columns:1fr var(--sidebar-width)}.l-grid--sidebar-reverse{grid-template-columns:var(--sidebar-width) 1fr}.l-grid--golden{grid-template-columns:1.618fr 1fr}.l-grid--golden-reverse{grid-template-columns:1fr 1.618fr}.l-cluster{display:flex;flex-wrap:wrap;gap:var(--cluster-gap);align-items:center}.l-cluster--between{justify-content:space-between}.l-cluster--center{justify-content:center}.l-center{display:flex;align-items:center;justify-content:center}.l-center--axis-x{display:flex;justify-content:center}.l-center--axis-y{display:flex;align-items:center}.l-with-sidebar{display:grid;grid-template-columns:1fr var(--sidebar-width);gap:2rem}.l-with-sidebar--left{grid-template-columns:var(--sidebar-width) 1fr}@media (max-width: 768px){.l-grid--2col,.l-grid--3col,.l-grid--4col,.l-grid--sidebar,.l-grid--sidebar-reverse,.l-grid--golden,.l-grid--golden-reverse,.l-with-sidebar,.l-with-sidebar--left{grid-template-columns:1fr}.l-container{padding:2rem 1rem}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-4px)}40%{transform:translate(4px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}.header{text-align:center;margin-bottom:3rem;animation:fadeInUp .8s ease-out}.header-badge{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--font-mono);font-size:.6875rem;font-weight:500;letter-spacing:.15em;color:var(--text-secondary);padding:.5rem 1rem;border:1px solid var(--border-color);border-radius:4px;margin-bottom:1.5rem;text-transform:uppercase;background:var(--bg-primary)}.header-badge a{color:var(--accent-primary);text-decoration:none;transition:opacity var(--transition-fast)}.header-badge a:hover{opacity:.8;text-decoration:underline}.badge-dot{width:6px;height:6px;background:var(--accent-primary);border-radius:50%;animation:pulse 2s ease-in-out infinite}.title{font-family:var(--font-display);font-size:clamp(2.5rem,8vw,4rem);font-weight:700;line-height:.95;letter-spacing:-.03em;margin-bottom:1rem;color:var(--text-primary)}.title-line{display:block}.title-line--accent{color:var(--accent-primary)}.subtitle{font-family:var(--font-mono);font-size:.875rem;color:var(--text-secondary);max-width:420px;margin:0 auto;line-height:1.7}.upload-zone{position:relative;background:var(--bg-primary);border-radius:8px;padding:3px;transition:all var(--transition-medium);border:2px dashed var(--border-color)}.upload-zone--dragover{background:var(--accent-glow);border-color:var(--accent-primary);transform:scale(1.01)}.upload-input{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;opacity:0;cursor:pointer;z-index:10}.upload-content{padding:3rem 2rem;text-align:center;transition:opacity var(--transition-medium),transform var(--transition-medium);background:var(--bg-secondary);border-radius:6px}.upload-zone.has-file .upload-content{opacity:0;pointer-events:none;transform:translateY(-10px)}.upload-icon{width:48px;height:48px;margin:0 auto 1.25rem;color:var(--text-muted);transition:color var(--transition-medium),transform var(--transition-medium)}.upload-zone:hover .upload-icon{color:var(--accent-primary);transform:translateY(-2px)}.upload-icon svg{width:100%;height:100%}.upload-text{display:flex;flex-direction:column;gap:.25rem}.upload-text--primary{font-family:var(--font-display);font-size:1.125rem;font-weight:600;color:var(--text-primary)}.upload-text--secondary{font-size:.8125rem;color:var(--text-muted)}.upload-hint{margin-top:1rem;font-size:.6875rem;color:var(--text-muted);letter-spacing:.05em}.file-info{position:absolute;top:3px;right:3px;bottom:3px;left:3px;display:none;align-items:center;gap:1rem;padding:1.5rem;background:var(--bg-tertiary);border-radius:6px;animation:slideIn .3s ease-out}.upload-zone.has-file .file-info{display:flex}.file-icon{flex-shrink:0;width:40px;height:40px;color:var(--accent-primary)}.file-icon svg{width:100%;height:100%}.file-details{flex:1;min-width:0}.file-name{font-family:var(--font-display);font-size:.9375rem;font-weight:500;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-size{font-size:.75rem;color:var(--text-muted);margin-top:.125rem}.file-remove{flex-shrink:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:6px;color:var(--text-muted);cursor:pointer;transition:all var(--transition-fast)}.file-remove:hover{border-color:var(--error);color:var(--error);background:var(--error-bg)}.file-remove svg{width:16px;height:16px}@media (max-width: 640px){.upload-content{padding:2rem 1.5rem}}.split-button{position:relative;display:flex;align-items:center;justify-content:center;gap:.75rem;width:100%;padding:1.125rem 1.5rem;font-family:var(--font-display);font-size:.9375rem;font-weight:600;letter-spacing:.02em;color:var(--bg-primary);background:var(--accent-primary);border:none;border-radius:8px;cursor:pointer;overflow:hidden;transition:all var(--transition-medium);box-shadow:0 2px #0000001a}.split-button:disabled{opacity:.5;cursor:not-allowed;background:var(--border-color)}.split-button:not(:disabled):hover{background:var(--accent-secondary);transform:translateY(-1px);box-shadow:0 4px 12px var(--accent-glow)}.split-button:not(:disabled):active{transform:translateY(1px);box-shadow:0 1px #0000001a}.split-button__text{position:relative;z-index:2}.split-button__icon{position:relative;z-index:2;width:18px;height:18px;transition:transform var(--transition-medium)}.split-button:not(:disabled):hover .split-button__icon{transform:translate(3px)}.split-button__icon svg{width:100%;height:100%}.split-button__progress{position:absolute;bottom:0;left:0;height:3px;background:#ffffff4d;width:0;transition:width .1s linear}.split-button.processing{pointer-events:none}.status{display:none;padding:1rem 1.25rem;border-radius:8px;border:1px solid var(--border-color);animation:slideIn .3s ease-out;background:var(--bg-primary)}.status--visible{display:block}.status--error{background:var(--error-bg);border-color:var(--error)}.status--success{background:var(--success-bg);border-color:var(--success)}.status--info{background:var(--info-bg);border-color:var(--info)}.status-content{display:flex;align-items:flex-start;gap:.75rem}.status-icon{flex-shrink:0;width:18px;height:18px;margin-top:.125rem}.status-icon:before{content:"";display:block;width:100%;height:100%;border-radius:50%}.status--error .status-icon:before{background:var(--error);mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='3'%3E%3Cpath d='M18 6L6 18M6 6L18 18'/%3E%3C/svg%3E") center/contain no-repeat;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='3'%3E%3Cpath d='M18 6L6 18M6 6L18 18'/%3E%3C/svg%3E") center/contain no-repeat}.status--success .status-icon:before{background:var(--success);mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='3'%3E%3Cpath d='M20 6L9 17L4 12'/%3E%3C/svg%3E") center/contain no-repeat;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='3'%3E%3Cpath d='M20 6L9 17L4 12'/%3E%3C/svg%3E") center/contain no-repeat}.status--info .status-icon:before{background:var(--info);mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='3'%3E%3Cpath d='M12 16v-4M12 8h.01'/%3E%3C/svg%3E") center/contain no-repeat;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='3'%3E%3Cpath d='M12 16v-4M12 8h.01'/%3E%3C/svg%3E") center/contain no-repeat}.status-message{font-size:.8125rem;color:var(--text-secondary);line-height:1.6}.status--error .status-message{color:#d94848}.status--success .status-message{color:#4a9d7a}.status--info .status-message{color:#5a9eb8}.chapters-preview{display:none;opacity:0;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;padding:1.5rem;transform:translateY(10px);transition:opacity .4s ease-out,transform .4s ease-out}.chapters-preview--visible{display:block;opacity:1;transform:translateY(0)}.chapters-preview__title{font-family:var(--font-display);font-size:.75rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);margin-bottom:1rem}.chapters-list{list-style:none;display:flex;flex-direction:column;gap:.5rem}.chapter-item{display:flex;align-items:center;gap:.75rem;padding:.75rem;background:var(--bg-secondary);border-radius:6px;font-size:.8125rem;animation:slideIn .3s ease-out backwards}.chapter-item:nth-child(1){animation-delay:.05s}.chapter-item:nth-child(2){animation-delay:.1s}.chapter-item:nth-child(3){animation-delay:.15s}.chapter-item:nth-child(4){animation-delay:.2s}.chapter-item:nth-child(5){animation-delay:.25s}.chapter-number{flex-shrink:0;width:24px;height:24px;display:flex;align-items:center;justify-content:center;background:var(--accent-primary);border-radius:6px;font-family:var(--font-mono);font-size:.6875rem;font-weight:600;color:var(--bg-primary)}.chapter-title{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--text-primary)}.chapter-pages{flex-shrink:0;font-size:.6875rem;color:var(--text-muted);font-family:var(--font-mono)}.footer{margin-top:3rem;padding-top:2rem;border-top:1px solid var(--border-color)}.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}.footer-cell{display:flex;flex-direction:column;gap:.25rem;padding:1rem;background:var(--bg-secondary);border-radius:8px;border:1px solid var(--border-light)}.footer-label{font-family:var(--font-mono);font-size:.625rem;font-weight:700;color:var(--accent-primary);letter-spacing:.1em}.footer-value{font-family:var(--font-display);font-size:.75rem;font-weight:500;color:var(--text-secondary)}@media (max-width: 640px){.footer-grid{grid-template-columns:repeat(2,1fr)}}:root{--accent-primary: #FF8B8B;--accent-secondary: #FF6B6B;--accent-glow: rgba(255, 139, 139, .15);--accent-rgb: 255, 139, 139}.container{position:relative;z-index:1;max-width:680px;margin:0 auto;padding:var(--space-xl) var(--space-lg);min-height:100vh;display:flex;flex-direction:column}.main{flex:1;display:flex;flex-direction:column;gap:var(--stack-gap)}