@font-face{font-family:Anthropic Serif;src:local(Georgia)}:root{--color-slate-dark:#141413;--color-ivory-medium:#f0eee6;--color-ivory-light:#faf9f5;--color-cloud-medium:#b0aea5;--color-cloud-dark:#87867f;--color-stone:#cccbc8;--color-slate-medium:#3d3d3a;--color-oat-warm:#e3dacc;--color-manilla:#f5e3c7;--color-clay:#d97757;--color-clay-deep:#c6613f;--font-serif:"Anthropic Serif",Georgia,"Source Serif Pro",Charter,ui-serif,serif;--font-sans:"Anthropic Sans",Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;--font-mono:"Anthropic Mono","JetBrains Mono","SF Mono",Menlo,Consolas,monospace}*{box-sizing:border-box}html,body{background:var(--color-ivory-medium);color:var(--color-slate-dark);font-family:var(--font-serif);height:100%;margin:0;font-size:20px;line-height:1.4}.app{display:grid;grid-template-columns:280px 1fr;background:var(--color-ivory-medium);max-width:1280px;height:100vh;margin:0 auto}.sidebar{border-right:1px solid var(--color-stone);display:flex;overflow:hidden;flex-direction:column;gap:32px;min-height:0;padding:24px 20px}.sidebar-section.chapters{display:flex;flex-direction:column;flex:auto;min-height:0}.sidebar-header .logo-mark{font-family:var(--font-sans);letter-spacing:-.02em;text-transform:uppercase;font-size:12px;font-weight:700}.sidebar-sub{font-family:var(--font-sans);color:var(--color-cloud-medium);letter-spacing:-.02em;margin:8px 0 0;font-size:12px}.sidebar-title{font-family:var(--font-sans);letter-spacing:-.02em;text-transform:uppercase;color:var(--color-cloud-dark);margin:0 0 12px;font-size:12px;font-weight:600}.project-card{background:var(--color-ivory-light);border:1px solid var(--color-stone);border-radius:16px;padding:16px}.project-name{font-family:var(--font-serif);margin:8px 0 0;font-size:16px}.project-card-loading{display:flex;align-items: center;gap:10px}.project-name-loading{font-family:var(--font-sans);color:var(--color-cloud-dark);margin:0;font-size:13px}.badge{display:inline-block;font-family:var(--font-sans);color:var(--color-slate-dark);letter-spacing:-.02em;font-size:12px;font-weight:600}.badge-outline{border:1px solid var(--color-cloud-dark);border-radius:0;padding:4px 10px}.chapter-list{list-style:none;display:flex;overflow-y:auto;flex-direction:column;gap:4px;min-height:0;margin:0;padding:0}.chapter-item{display:flex;font-family:var(--font-sans);letter-spacing:-.005em;border-radius:8px;align-items:baseline;gap:10px;padding:8px;font-size:15px}.chapter-num{margin-right:6px;font-weight:600}.chapter-status{text-align:center;flex:none;width:16px;font-size:12px}.chapter-item.done{color:var(--color-cloud-dark)}.chapter-item.done .chapter-status{color:var(--color-slate-dark)}.chapter-item.current{color:var(--color-slate-dark);background:var(--color-oat-warm);font-weight:600}.chapter-item.current .chapter-status{color:var(--color-clay)}.sidebar-actions{display:flex;gap:8px;margin-bottom:12px}.sidebar-actions .btn{flex:auto;justify-content:center}.history-list{list-style:none;display:flex;overflow-y:auto;flex-direction:column;gap:4px;min-height:0;margin:0;padding:0}.history-row{display:flex;align-items: center;gap:4px}.history-row .history-item{flex:auto}.history-item-delete{display:flex;color:var(--color-cloud-medium);cursor:pointer;background:0 0;border:none;border-radius:8px;flex:none;justify-content:center;align-items: center;width:28px;height:28px}.history-item-delete:hover{background:var(--color-oat-warm);color:var(--color-clay-deep)}.history-item{display:flex;cursor:pointer;font-family:var(--font-sans);color:var(--color-slate-medium);text-align:left;background:0 0;border:none;border-radius:8px;justify-content:space-between;align-items:baseline;gap:8px;width:100%;padding:8px;font-size:13px}.history-item:hover{background:var(--color-ivory-light)}.history-item.active{background:var(--color-oat-warm);color:var(--color-slate-dark);font-weight:600}.history-item-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:auto;min-width:0}.history-item-time{color:var(--color-cloud-medium);flex:none;font-size:11px}.history-empty{font-family:var(--font-sans);color:var(--color-cloud-medium);padding:8px;font-size:12px}.landing-history-btn{font-size:13px}.history-modal-overlay{position:fixed;display:flex;z-index:100;background:#14141366;justify-content:center;align-items: center;inset:0}.history-modal-panel{background:var(--color-ivory-light);border:1px solid var(--color-stone);display:flex;border-radius:20px;flex-direction:column;width:420px;max-width:90vw;min-height:0;max-height:70vh;padding:24px}.history-modal-header{display:flex;justify-content:space-between;align-items: center;margin-bottom:16px}.history-modal-title{font-family:var(--font-serif);margin:0;font-size:20px}.history-modal-close{font-family:var(--font-sans);color:var(--color-cloud-dark);font-size:13px}.history-modal-delete-all{font-family:var(--font-sans);color:var(--color-clay-deep);align-self: flex-start;margin-bottom:12px;padding:4px 0;font-size:12px}.history-modal-list{overflow-y:auto;min-height:0}.chapter-item.pending{color:var(--color-cloud-medium)}.sidebar-footer{display:flex;flex-direction:column;gap:8px;margin-top:auto}.export-group{display:flex;flex-direction:column;gap:6px}.export-format-label{font-family:var(--font-sans);color:var(--color-cloud-dark);font-size:12px}.export-format-select,.export-group 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24px}.btn-clay:not(:disabled):hover{background:var(--color-clay-deep)}.btn-text{color:var(--color-slate-dark);text-decoration:none;border-radius:8px;padding:12px}.btn-text:not(:disabled):hover{background:var(--color-oat-warm)}.chat-main{display:flex;flex-direction:column;height:100vh}.chat-topbar{display:flex;border-bottom:1px solid var(--color-stone);justify-content:space-between;align-items: center;padding:24px 32px}.chat-title{font-family:var(--font-sans);letter-spacing:-.0005em;margin:0;font-size:24px;font-weight:600}.chat-subtitle{font-family:var(--font-sans);color:var(--color-cloud-dark);letter-spacing:-.005em;margin:4px 0 0;font-size:15px}.chat-scroll{overflow-y:auto;display:flex;flex-direction:column;flex:1;gap:24px;padding:32px}.msg{display:flex;gap:12px;max-width:720px}.msg-assistant{align-self: flex-start}.msg-user{flex-direction:row-reverse;align-self: flex-end}.avatar{display:flex;font-family:var(--font-sans);letter-spacing:-.02em;border-radius:16px;flex:none;justify-content:center;align-items: center;width:32px;height:32px;font-size:12px;font-weight:700}.avatar-assistant{background:var(--color-slate-dark);color:var(--color-ivory-light)}.avatar-user{background:var(--color-oat-warm);color:var(--color-slate-dark)}.bubble{background:var(--color-ivory-light);border:1px solid var(--color-stone);white-space:pre-wrap;border-radius:24px;padding:16px 20px}.bubble p{margin:0 0 8px}.bubble p:last-child{margin-bottom:0}.bubble-user{background:var(--color-oat-warm);border-color:var(--color-oat-warm)}.bubble-error{color:#b3261e;white-space:pre-wrap;background:#fdecea;border-color:#f5c2c0}.summary-list{margin:0 0 8px;padding-left:20px}.summary-list li{margin-bottom:4px}.file-chip{display:inline-flex;background:var(--color-ivory-light);border:1px solid var(--color-stone);font-family:var(--font-sans);border-radius:8px;align-items: center;gap:8px;padding:8px 12px;font-size:15px}.file-icon{background:var(--color-clay);color:var(--color-ivory-light);display:flex;border-radius:4px;justify-content:center;align-items: center;width:20px;height:20px;font-size:12px;font-weight:700}.chapter-bubble{max-width:100%}.chapter-card-header{display:flex;align-items:baseline;gap:10px;margin-bottom:8px}.chapter-tag{font-family:var(--font-sans);color:var(--color-ivory-light);background:var(--color-slate-dark);border-radius:0;padding:2px 8px;font-size:12px;font-weight:700}.chapter-card-header h2{font-family:var(--font-sans);letter-spacing:-.0005em;margin:0;font-size:24px;font-weight:600}.chapter-text{font-family:var(--font-serif);font-size:20px;line-height:1.4}.chapter-actions{display:flex;gap:4px;margin-top:12px}.typing{display:inline-flex;gap:4px;padding:4px 0}.typing span{background:var(--color-cloud-dark);animation:typing-bounce 1.2s infinite ease-in-out;border-radius:50%;width:6px;height:6px}.typing span:nth-child(2){animation-delay:.15s}.typing span:nth-child(3){animation-delay:.3s}@keyframes typing-bounce{0%,60%,to{transform:translateY(0);opacity:.5}30%{transform:translateY(-4px);opacity:1}}.composer{position:relative;background:var(--color-ivory-light);border:1px solid var(--color-stone);border-radius:16px;margin:16px 32px 24px;padding:14px 16px 56px}.composer-input{display:block;resize:none;font-family:var(--font-serif);color:var(--color-slate-dark);background:0 0;border:none;width:100%;min-height:48px;padding:0;font-size:20px}.composer-input:focus{outline:none}.composer:focus-within{border-color:var(--color-slate-dark)}.composer-send{position:absolute;bottom:12px;right:12px}.composer-send:disabled,.composer-input:disabled,.btn-attach:disabled{opacity:.45;cursor:not-allowed}.btn-attach{background:var(--color-ivory-light);border:1px solid var(--color-stone);display:flex;border-radius:16px;flex:none;justify-content:center;align-items: center;width:48px;height:48px}.btn-attach:not(:disabled):hover{border-color:var(--color-slate-dark)}.btn-outlined-dark:disabled{opacity:.5;cursor:not-allowed}.chapter-actions .btn-ivory:disabled,.chapter-actions .btn-text:disabled{opacity:.45;cursor:not-allowed}.inline-hint{font-family:var(--font-sans);color:var(--color-cloud-dark);letter-spacing:-.02em;margin-top:4px;font-size:12px}@media (max-width:860px){.app{grid-template-columns:1fr}.sidebar{display:none}}.landing{position:relative;display:flex;background:var(--color-ivory-medium);justify-content:center;align-items: center;height:100vh;padding:24px}.landing-user{position:absolute;display:flex;font-family:var(--font-sans);color:var(--color-cloud-dark);align-items: center;gap:12px;font-size:13px;top:24px;right:32px}.landing-notice{position:fixed;display:flex;border:1px solid var(--color-clay);background:var(--color-oat-warm);font-family:var(--font-sans);color:var(--color-slate-dark);z-index:20;border-radius:12px;justify-content:space-between;align-items: center;gap:12px;width:calc(100% - 48px);max-width:640px;padding:12px 16px;font-size:13px;top:24px;left:50%;transform:translate(-50%);box-shadow:0 8px 24px #00000014}.landing-card{background:var(--color-ivory-light);border:1px solid var(--color-stone);display:flex;text-align:center;border-radius:24px;flex-direction:column;align-items: center;gap:8px;width:100%;max-width:640px;padding:48px;transition:border-color .15s,background .15s}.landing-card.drag-active{border-color:var(--color-clay);background:var(--color-oat-warm)}.landing-card 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