:root{color:#25231f;background:#f7f4ee;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;--paper: #fffdf8;--paper-deep: #eee7da;--ink: #25231f;--muted: #746f66;--line: #ddd4c4;--green: #2f6b57;--green-soft: #d9ebe2;--coral: #b65e4d;--blue: #355d8a;--shadow: 0 18px 48px rgba(63, 52, 39, .12)}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:linear-gradient(180deg,#fffdf8db,#f7f4ee),#f7f4ee}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.58}.app-shell{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:32px 0 72px}.topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;padding:22px 0 18px}.eyebrow{margin:0 0 8px;color:var(--green);font-size:12px;font-weight:700;letter-spacing:0;text-transform:uppercase}h1,h2{margin:0;color:var(--ink);letter-spacing:0}h1{font-size:34px;line-height:1.16}h2{font-size:20px;line-height:1.25}.subtitle{margin:8px 0 0;color:var(--muted);font-size:15px;line-height:1.6}.icon-button,.send-button{border:0;border-radius:8px;background:var(--green);color:#fffdf8;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:0 16px;font-weight:700;box-shadow:0 10px 24px #2f6b572e}.text-button,.back-button{border:0;background:transparent;color:var(--green);display:inline-flex;align-items:center;gap:7px;padding:0;font-weight:700}.ghost-icon{width:34px;height:34px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);display:inline-flex;align-items:center;justify-content:center}.shelf-section{margin-top:28px}.section-title{display:flex;align-items:center;gap:10px;margin-bottom:16px}.section-title svg{color:var(--coral)}.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:18px}.book-card{min-height:276px;padding:0;border:0;background:transparent;text-align:left;color:inherit;display:grid;grid-template-rows:210px auto auto auto auto;gap:6px}.book-cover{width:100%;height:210px;object-fit:cover;border-radius:8px;background:#d8ccbb;box-shadow:var(--shadow);border:1px solid rgba(67,51,33,.12)}.book-cover-empty{display:flex;align-items:center;justify-content:center;background:linear-gradient(90deg,rgba(255,255,255,.22) 0 14%,transparent 14%),#5d6f7b;color:#fffdf8}.book-cover-empty span{width:54px;height:54px;border:1px solid rgba(255,255,255,.54);border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:24px;font-weight:700}.book-title{margin-top:4px;font-weight:800;line-height:1.25;color:var(--ink)}.book-author,.book-meta,.book-one-line,.muted{color:var(--muted);font-size:13px;line-height:1.45}.book-one-line{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.empty-state{min-height:96px;border:1px dashed var(--line);border-radius:8px;background:#fffdf89e;color:var(--muted);display:flex;align-items:center;justify-content:center;padding:22px}.dialog-backdrop{position:fixed;inset:0;z-index:20;background:#25231f47;display:flex;align-items:center;justify-content:center;padding:20px}.dialog,.login-panel{width:min(430px,100%);border:1px solid var(--line);border-radius:8px;background:var(--paper);box-shadow:var(--shadow);padding:22px}.dialog-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}label{display:grid;gap:8px;margin-bottom:14px;color:var(--muted);font-size:13px;font-weight:700}input,select,textarea{width:100%;border:1px solid var(--line);border-radius:8px;background:#fffefa;color:var(--ink);outline:none;padding:11px 12px}textarea{resize:vertical;line-height:1.6}input:focus,select:focus,textarea:focus{border-color:var(--green);box-shadow:0 0 0 3px #2f6b571f}.check-row{grid-template-columns:18px 1fr;align-items:center;color:var(--ink)}.check-row input{width:16px;height:16px}.dialog-actions{display:flex;align-items:center;justify-content:flex-end;gap:14px;margin-top:8px}.form-error,.inline-error,.action-error{color:#9d3f31;font-size:13px;line-height:1.4}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.brand-mark{width:42px;height:42px;border-radius:8px;background:var(--green-soft);color:var(--green);display:flex;align-items:center;justify-content:center;margin-bottom:18px}.login-form{margin-top:22px;display:grid;gap:12px}.reading-shell{width:min(1280px,calc(100% - 32px));margin:0 auto;min-height:100vh;padding:26px 0;display:grid;grid-template-columns:minmax(270px,360px) minmax(0,1fr);gap:22px}.book-pane,.chat-pane{border:1px solid var(--line);border-radius:8px;background:#fffdf8d1;box-shadow:var(--shadow)}.book-pane{padding:18px;display:grid;align-content:start;gap:18px}.book-pane .book-cover{height:320px}.progress-field{margin:0}.progress-field small{color:var(--green)}.saved-block{border-top:1px solid var(--line);padding-top:18px}.saved-block h2{font-size:16px;margin-bottom:12px}.saved-block article{border-left:3px solid var(--green-soft);padding-left:12px;margin:0 0 14px}.saved-block strong{display:block;margin-bottom:4px}.saved-block p{margin:0;color:var(--muted);display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}.chat-pane{min-height:calc(100vh - 52px);display:grid;grid-template-rows:auto auto 1fr auto;overflow:hidden}.chat-head{min-height:74px;padding:18px 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.chat-head svg{color:var(--blue)}.inline-error{margin:14px 20px 0;padding:10px 12px;border:1px solid rgba(157,63,49,.22);border-radius:8px;background:#f6e2dc80}.messages{padding:20px;overflow-y:auto;display:flex;flex-direction:column;gap:16px}.message{display:flex;flex-direction:column;max-width:min(720px,90%);gap:8px}.message-user{align-self:flex-end}.message-assistant{align-self:flex-start}.message-content{border-radius:8px;padding:13px 15px;line-height:1.75;white-space:pre-wrap}.message-content p{margin:0}.message-user .message-content{background:var(--green);color:#fffdf8}.message-assistant .message-content{background:#fffefa;border:1px solid var(--line)}.pending-label{display:inline-block;margin-top:8px;color:var(--green);font-size:12px;font-weight:700}.message-user .pending-label{color:#fffdf8d1}.message-actions{display:flex;gap:8px;flex-wrap:wrap}.message-actions button{min-height:30px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--muted);display:inline-flex;align-items:center;gap:5px;padding:0 9px;font-size:12px;font-weight:700}.action-error{display:block;margin-top:6px}.chat-input{padding:16px 20px 18px;border-top:1px solid var(--line);display:grid;grid-template-columns:minmax(0,1fr) 48px;gap:10px;align-items:end}.send-button{width:48px;height:48px;padding:0}.logout-button{position:fixed;right:18px;bottom:18px;width:40px;height:40px;border:1px solid var(--line);border-radius:8px;color:var(--muted);background:var(--paper);display:inline-flex;align-items:center;justify-content:center;box-shadow:var(--shadow)}.top-actions,.inline-actions,.card-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.secondary-button,.mini-button{border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:0 11px;font-weight:700}.mini-button{min-height:30px;padding:0 9px;font-size:12px;color:var(--muted)}.mini-button.danger{color:#9d3f31}.readonly-badge,.readonly-note,.readonly-chat{border:1px solid var(--line);border-radius:8px;background:#fffdf8b8;color:var(--muted);display:inline-flex;align-items:center;gap:7px;padding:10px 12px;font-size:13px;font-weight:700}.readonly-chat{margin:0 20px 18px;justify-content:center}.book-card{min-height:320px;display:grid;grid-template-rows:1fr auto;gap:8px}.book-open{padding:0;border:0;background:transparent;text-align:left;color:inherit;display:grid;grid-template-rows:210px auto auto auto auto;gap:6px}.card-actions{min-height:34px}.wide-dialog{width:min(760px,100%)}.form-grid{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:18px}.cover-picker{display:grid;gap:12px;align-content:start}.preview-cover{height:260px}.cover-results{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.cover-choice{border:1px solid var(--line);border-radius:8px;background:var(--paper);padding:6px;color:var(--muted);display:grid;gap:5px;font-size:11px;text-align:left}.cover-choice img{width:100%;aspect-ratio:2 / 3;object-fit:cover;border-radius:6px}.message-failed .message-content{border-color:#9d3f3147;background:#f6e2dc57}.failed-label{color:#9d3f31}.archive-shell{width:min(980px,calc(100% - 32px));margin:0 auto;padding:28px 0 72px}.archive-head{margin-top:22px;display:grid;grid-template-columns:130px minmax(0,1fr);gap:22px;align-items:end}.archive-cover{height:190px}.archive-content{margin-top:24px;border:1px solid var(--line);border-radius:8px;background:#fffdf8d1;box-shadow:var(--shadow);padding:20px}.archive-content pre{margin:0;color:var(--ink);white-space:pre-wrap;line-height:1.78;font:inherit}.reflection-block{margin-top:22px;border-top:1px solid var(--line);padding-top:18px}.reflection-block p{color:var(--muted);line-height:1.7}.user-form{display:grid;grid-template-columns:repeat(4,minmax(0,1fr)) auto;align-items:end;gap:12px;border:1px solid var(--line);border-radius:8px;background:#fffdf8d1;padding:16px}.user-form label{margin:0}.user-list{margin-top:22px;display:grid;gap:12px}.user-row{border:1px solid var(--line);border-radius:8px;background:#fffdf8d1;padding:15px;display:flex;justify-content:space-between;gap:16px;align-items:center}.user-row p{margin:4px 0 0;color:var(--muted);font-size:13px}@media(max-width:820px){.app-shell,.reading-shell{width:min(100% - 22px,720px)}.topbar{display:grid}h1{font-size:28px}.reading-shell{grid-template-columns:1fr;padding:14px 0 80px}.book-pane .book-cover{height:240px;max-width:180px}.chat-pane{min-height:70vh}.message{max-width:100%}.form-grid,.archive-head,.user-form{grid-template-columns:1fr}.user-row{display:grid}}