:root{--ink:#162d3b;--muted:#586b75;--line:#dbe3e6;--paper:#f5f7f8;--blue:#18659b;--blue-light:#eef6fc;--green:#236b5a;--white:#fff;--danger:#a32d35;--radius:16px;font-family:Inter,"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,textarea{font:inherit}button,a,textarea{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid #327caf;outline-offset:4px}button:disabled{cursor:wait;opacity:.6}button,a{transition:background-color .2s,color .2s,border-color .2s}button:active{filter:brightness(.95)}[hidden]{display:none!important}.topbar{height:88px;padding:0 5vw;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:var(--white)}.brand{display:flex;align-items:center;gap:13px;text-decoration:none;font-size:17px;font-weight:750;letter-spacing:2px}.brand-mark{display:grid;place-items:center;width:40px;height:40px;background:var(--ink);color:white;border-radius:10px;font-size:26px;font-family:Georgia,serif;font-weight:400}.brand small{display:block;margin-top:4px;font-size:12px;letter-spacing:3px;color:var(--muted);font-weight:400}.manual-link{font-size:14px;text-decoration:none;display:flex;align-items:center;gap:20px;min-height:44px}.manual-link:hover{color:var(--blue)}main{max-width:1360px;margin:0 auto;padding:60px 5vw 0}.workspace{display:grid;grid-template-columns:.9fr 1.1fr;gap:70px;padding-bottom:54px}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--muted);font-weight:650}h1{font-size:clamp(32px,3.3vw,48px);line-height:1.45;letter-spacing:-1.5px;font-weight:650;margin:20px 0 16px}.intro>p{color:var(--muted);font-size:16px;line-height:1.9;margin:0}.manual-card{display:flex;gap:15px;align-items:center;margin-top:32px}.manual-card svg{width:36px;height:44px;color:var(--blue)}.manual-card strong{font-size:15px;font-weight:600}.manual-card span{display:block;color:var(--muted);font-size:13px;margin-top:7px}.source-note{margin-top:34px;border-top:1px solid var(--line);padding-top:24px;max-width:350px}.source-note span{font-size:13px;font-weight:650;color:var(--blue)}.source-note p{color:var(--muted);font-size:13px;line-height:1.6;margin:7px 0 18px}.question-panel{background:var(--white);border:1px solid var(--line);border-radius:20px;padding:32px;box-shadow:0 10px 36px #152e3c05}.section-label{font-size:18px;font-weight:650;display:flex;align-items:center;gap:10px;margin-bottom:26px}.tiny-line{width:4px;height:19px;background:var(--blue);border-radius:4px}label{display:block;color:var(--muted);font-size:14px;margin-bottom:12px}textarea{display:block;resize:vertical;width:100%;min-height:140px;max-height:350px;padding:17px 18px;border:1px solid var(--line);border-radius:12px 12px 0 0;line-height:1.8;color:var(--ink);background:#fafcfd;font-size:16px}textarea::placeholder{color:#72818b}textarea:focus{border-color:var(--blue)}.form-bottom{display:flex;align-items:center;justify-content:space-between;border:1px solid var(--line);border-top:0;border-radius:0 0 12px 12px;padding:12px;background:#fafcfd}.form-bottom>span{font-size:12px;color:var(--muted);padding-left:6px}.form-bottom button{border:0;border-radius:8px;background:var(--ink);color:white;min-height:46px;padding:0 19px;display:flex;gap:28px;align-items:center;font-size:14px}.form-bottom button:hover{background:var(--blue)}.form-hint{font-size:12px;color:var(--muted);margin:10px 0 28px}.suggestion-label{font-size:13px;color:var(--muted);margin-bottom:13px}.suggestions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.suggestions button{background:white;border:1px solid var(--line);border-radius:9px;min-height:48px;text-align:left;display:flex;align-items:center;justify-content:space-between;padding:12px 13px;color:var(--ink);font-size:14px}.suggestions button:hover{background:var(--blue-light);border-color:#97bfd8}.suggestions button span:last-child{color:var(--muted)}.service-note{font-size:12px;line-height:1.8;color:var(--muted);margin:22px 0 0}#form-error{color:var(--danger);font-size:14px;line-height:1.6}.results{border-top:1px solid var(--line);padding:34px 0 20px}.result-heading{display:flex;justify-content:space-between;gap:24px;align-items:center;margin-bottom:24px}h2{font-size:24px;line-height:1.5;font-weight:600;margin:10px 0 0}.text-button{flex-shrink:0;border:0;background:transparent;color:var(--blue);font-size:14px;min-height:44px}.answer-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}.answer-card{border:1px solid var(--line);border-radius:var(--radius);background:white;overflow:hidden;min-width:0}.card-header{display:flex;align-items:center;justify-content:space-between;padding:21px 24px;border-bottom:1px solid var(--line);background:var(--blue-light);gap:8px}.card-header>div{display:flex;gap:13px;align-items:center}.source-number{font-size:13px;color:var(--muted);font-family:monospace}h3{font-size:18px;font-weight:650;margin:0}.badge{font-size:12px;color:var(--blue);background:#dfeef9;padding:6px 9px;border-radius:5px;white-space:nowrap}.web-card .card-header{background:#f0f6f3}.web-badge{color:var(--green);background:#e0eee7}.answer-body{padding:24px;font-size:16px;line-height:1.95;white-space:pre-wrap;overflow-wrap:anywhere}.answer-body a{color:var(--blue);text-underline-offset:3px}.sources{padding:0 24px 24px}.sources:empty{padding:0}.sources-label{font-size:12px;color:var(--muted);margin-bottom:12px;letter-spacing:1px}details{border-top:1px solid var(--line);padding:10px 0}summary{list-style:none;cursor:pointer;min-height:44px;display:flex;gap:10px;align-items:center;font-size:14px;color:var(--blue);line-height:1.6}summary:before{content:'+';font-size:20px}details[open] summary:before{content:'−'}details pre{font:13px/1.8 "Microsoft YaHei",sans-serif;white-space:pre-wrap;overflow-wrap:anywhere;background:var(--paper);padding:16px;border-radius:8px;color:#364d59;max-height:360px;overflow:auto;margin:8px 0}details>a,.source-link{display:block;min-height:44px;font-size:14px;line-height:1.6;color:var(--blue);padding:10px 0;text-decoration:none}.source-link{border-top:1px solid var(--line);overflow-wrap:anywhere}.source-link small{display:block;color:var(--muted);font-size:12px;margin-top:4px}#loading{display:flex;align-items:center;gap:12px;background:#eaf1f5;border-radius:10px;padding:17px 20px;margin-bottom:20px;color:var(--muted);font-size:14px}.spinner{border:2px solid #c4d5df;border-top-color:var(--blue);border-radius:50%;height:18px;width:18px;animation:spin 1s linear infinite;flex-shrink:0}@keyframes spin{to{transform:rotate(360deg)}}.timestamp{font-size:12px;color:var(--muted);margin-top:18px}footer{border-top:1px solid var(--line);padding:25px 0 30px;display:flex;align-items:flex-start;justify-content:space-between;gap:24px;color:var(--muted);font-size:12px;line-height:1.8}footer>span:first-child{letter-spacing:1px;white-space:nowrap}footer p{margin:0;max-width:560px}footer>span:last-child{white-space:nowrap}@media(min-width:1440px){main{padding-left:40px;padding-right:40px}}@media(max-width:900px){main{padding-top:36px}.workspace{gap:32px;grid-template-columns:.85fr 1.15fr}.question-panel{padding:24px}.source-note{display:none}.answer-grid{gap:16px}.card-header{padding:18px}.answer-body{padding:20px}.sources{padding:0 20px 20px}footer{flex-wrap:wrap}}@media(max-width:680px){.topbar{height:74px;padding:0 20px}.brand{font-size:14px;letter-spacing:1px}.brand small{font-size:11px}.manual-link{font-size:12px;gap:10px}main{padding:28px 20px 0}.workspace{display:block;padding-bottom:32px}.intro h1{font-size:32px;line-height:1.35;margin-top:15px}.intro h1 br{display:none}.intro>p{font-size:14px}.desktop{display:none}.manual-card{margin:18px 0 25px}.manual-card svg{width:26px;height:32px}.manual-card strong{font-size:14px}.manual-card span{font-size:12px}.question-panel{padding:22px 18px;border-radius:16px}.section-label{font-size:17px;margin-bottom:22px}.form-hint{display:none}.suggestion-label{margin-top:24px}.eyebrow{font-size:10px;letter-spacing:1.5px}.answer-grid{grid-template-columns:1fr}.result-heading{align-items:flex-start;gap:10px}h2{font-size:21px}.text-button{font-size:12px}.card-header{padding:18px 20px}.answer-body{font-size:15px}footer{display:block;padding:20px 0}footer p{margin:10px 0}textarea{min-height:130px}.suggestions button{font-size:13px;padding:12px 10px}.timestamp{line-height:1.7}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* Mobile reading and touch layout; desktop keeps its two-column workspace. */
/* Source passages are readable in the page flow on every screen size. */
details pre{font-size:16px;line-height:1.85;max-height:none;overflow:visible}
.mobile-title,.answer-nav{display:none}
@media(max-width:680px){
  :root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
  html{scroll-padding-top:80px}
  .topbar{height:auto;min-height:64px;gap:12px;padding:8px max(16px,env(safe-area-inset-right)) 8px max(16px,env(safe-area-inset-left))}
  .brand{gap:9px;min-height:44px;flex-shrink:0}
  .brand-mark{width:34px;height:36px;font-size:24px;border-radius:8px}
  .brand small{font-size:12px;letter-spacing:2px}
  .manual-link{font-size:14px;gap:6px;line-height:1.5;text-align:right}
  main{padding:20px max(16px,env(safe-area-inset-right)) 0 max(16px,env(safe-area-inset-left))}
  .intro>.eyebrow,.desktop-title{display:none}
  .mobile-title{display:inline}
  .intro h1{font-size:1.5rem;line-height:1.4;letter-spacing:-.5px;margin:0 0 8px}
  .intro>p{font-size:.875rem;line-height:1.65;max-width:34em}
  .manual-card{gap:8px;margin:12px 0 20px}
  .manual-card svg{width:20px;height:24px;flex-shrink:0}
  .manual-card>div{display:flex;flex-wrap:wrap;gap:4px 10px;align-items:center}
  .manual-card strong{font-size:.8125rem;font-weight:500;color:var(--muted)}
  .manual-card span{font-size:.8125rem;margin:0}
  .workspace{padding-bottom:24px}
  .question-panel{padding:20px 16px;border-radius:16px;box-shadow:0 4px 20px #152e3c04}
  .section-label{font-size:1.0625rem;margin-bottom:18px}
  label{font-size:.875rem;margin-bottom:10px}
  textarea{height:112px;min-height:112px;padding:13px 14px;font-size:1rem;line-height:1.7;resize:vertical}
  .form-bottom{gap:12px;padding:10px}
  .form-bottom button{min-height:48px;flex:1;justify-content:center;gap:18px;font-size:1rem;font-weight:600}
  .form-bottom>span{padding:0 4px;font-size:.75rem;white-space:nowrap}
  .suggestion-label{font-size:.875rem;margin-top:22px;margin-bottom:12px}
  .suggestions{gap:10px}
  .suggestions button{min-height:48px;font-size:.875rem;padding:12px;gap:8px;line-height:1.5}
  .service-note{font-size:.8125rem;line-height:1.7;margin-top:18px}
  #form-error{padding:12px;border-radius:8px;background:#fff1f1;line-height:1.7;margin:12px 0 0}
  .results{padding:24px 0 18px;scroll-margin-top:12px}
  .result-heading{display:grid;grid-template-columns:minmax(0,1fr);gap:8px;margin-bottom:14px}
  .result-heading .eyebrow{font-size:.75rem;letter-spacing:1px}
  h2{font-size:1.25rem;line-height:1.55;margin-top:8px;overflow-wrap:anywhere}
  .text-button{justify-self:start;font-size:.875rem;min-height:44px;padding:8px 12px;background:#e7eff5;border-radius:8px}
  .answer-nav{display:flex;position:sticky;top:0;z-index:2;gap:10px;padding:10px 0 12px;background:var(--paper);border-bottom:1px solid var(--line);margin-bottom:16px}
  .answer-nav a{display:flex;flex:1;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:10px 8px;border:1px solid #b6ccd9;border-radius:10px;background:var(--blue-light);color:var(--blue);font-size:.75rem;text-decoration:none}
  .answer-nav a:last-child{background:#edf5f1;border-color:#b8d1c6;color:var(--green)}
  .answer-nav a span{font-size:.9375rem;font-weight:600}
  .answer-card{scroll-margin-top:84px}
  .answer-card:focus{outline:2px solid var(--blue);outline-offset:3px}
  .card-header{padding:18px 16px;flex-wrap:wrap;gap:12px}
  .card-header>div{gap:10px}
  h3{font-size:1.125rem}
  .badge{font-size:.75rem}
  .answer-body{font-size:1rem;line-height:1.85;padding:20px 16px}
  .sources{padding:0 16px 18px}
  .sources-label{font-size:.875rem;letter-spacing:0;line-height:1.6}
  summary{min-height:52px;font-size:.9375rem;gap:10px;padding:6px 0;overflow-wrap:anywhere}
  summary:before{flex-shrink:0}
  details pre{font:1rem/1.85 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;max-height:none;overflow:visible;padding:14px;margin:6px 0 10px;border:1px solid var(--line)}
  details>a{font-size:.9375rem;min-height:48px;padding:12px;border-radius:8px;background:var(--blue-light);line-height:1.6}
  .source-link{font-size:1rem;line-height:1.7;padding:14px 0}
  .source-link small{font-size:.8125rem}
  #loading{font-size:.875rem;line-height:1.7;padding:16px;align-items:flex-start}
  .spinner{margin-top:3px}
  .timestamp{font-size:.8125rem;line-height:1.8}
  footer{font-size:.8125rem;padding-bottom:max(24px,env(safe-area-inset-bottom))}
  footer p{line-height:1.8}
}
@media(max-width:360px){
  .brand{font-size:12px;letter-spacing:.5px}
  .manual-link{font-size:13px}
  .question-panel{padding:18px 12px}
  .suggestions button{padding:10px;font-size:.8125rem}
}
@media(hover:none){
  .suggestions button:active,.answer-nav a:active{background:#dbeaf5}
}