:root{
    --paper:#1A1A1A;
    --card:#252525;
    --ink:#E0E0E0;
    --ink-soft:#A0A0A0;
    --accent-red:#FF6B6B;
    --accent-gold:#D4A017;
    --line:#404040;
    --text:#F0F0F0;
    --text-muted:#B0B0B0;
    --ok:#66BB6A;
    --drag-bg: rgba(214, 160, 23, 0.1);
  }
  *{box-sizing:border-box;}
  html,body{margin:0;padding:0;}
  body{
    background:var(--paper);
    color:var(--text);
    font-family:'IBM Plex Sans', sans-serif;
    line-height:1.5;
    padding:0 0 80px;
    transition: background-color 0.2s;
  }
  body.dragover {
    background-color: #201e18;
  }
  a{color:var(--ink);}
  header.top{
    max-width:1180px;
    margin:0 auto;
    padding:40px 24px 28px;
    position: relative;
  }
  .top-nav {
    display: flex;
    justify-content: flex-end;
    gap: 16px;
    margin-bottom: 20px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }
  .top-nav a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
  }
  .top-nav a:hover {
    color: var(--accent-gold);
  }
  .eyebrow{
    font-family:'IBM Plex Mono', monospace;
    text-transform:uppercase;
    letter-spacing:.12em;
    font-size:.72rem;
    color:var(--accent-gold);
    margin:0 0 10px;
  }
  .title-logo{
    color: var(--text-muted);
  }
  .title-logo .gold{
    color: var(--accent-gold);
  }
    .btn-back {
    display:inline-block;
    font-family:'IBM Plex Sans', sans-serif;
    background:var(--card);
    border:1px solid var(--line);
    color:var(--ink);
    padding:10px 20px;
    border-radius:3px;
    font-size:.88rem;
    font-weight:500;
    margin-bottom:20px;
  }
  .btn-back:hover {
    background:rgba(255,255,255,0.05);
    border-color:var(--ink-soft);
  }
  h1{
    font-family:'Fraunces', serif;
    font-weight:600;
    font-size:2.5rem;
    margin:0 0 10px;
    color:var(--ink);
    letter-spacing:-.01em;
  }
  header.top p{
    max-width:640px;
    color:var(--text-muted);
    font-size:1rem;
    margin:0;
  }
  .disclaimer{
    max-width:1180px;
    margin:22px auto 0;
    padding:0 24px;
  }
  .disclaimer .box{
    border:1px solid var(--line);
    border-left:3px solid var(--accent-red);
    background:var(--card);
    padding:12px 16px;
    font-size:.85rem;
    color:var(--text-muted);
    border-radius:2px;
  }
  .disclaimer strong{color:var(--text);}
  main.layout{
    max-width:1180px;
    margin:36px auto 0;
    padding:0 24px;
    display:grid;
    grid-template-columns:1.1fr 0.9fr;
    gap:32px;
    align-items:start;
  }
  @media (max-width: 900px){
    main.layout{grid-template-columns:1fr;}
  }
  .card{
    background:var(--card);
    border:1px solid var(--line);
    border-radius:3px;
  }
  fieldset{
    border:none;
    padding:22px 24px;
    margin:0;
    border-bottom:1px solid var(--line);
  }
  fieldset:last-of-type{border-bottom:none;}
  legend{
    font-family:'IBM Plex Mono', monospace;
    text-transform:uppercase;
    letter-spacing:.08em;
    font-size:.72rem;
    color:var(--ink-soft);
    padding:0;
    margin-bottom:16px;
  }
  .field{margin-bottom:14px;}
  .field:last-child{margin-bottom:0;}
  .row{display:grid; grid-template-columns:1fr 1fr; gap:14px;}
  .row-3{display:grid; grid-template-columns:1fr 1fr 1fr; gap:14px;}
  .isbn-input-wrapper {
    display: flex;
    gap: 8px;
  }
  @media (max-width:520px){
    .row, .row-3{grid-template-columns:1fr;}
  }
  label{
    display:block;
    font-size:.8rem;
    color:var(--text-muted);
    margin-bottom:5px;
  }
  label .req{color:var(--accent-red); margin-left:2px;}
  input[type=text], input[type=number], input[type=date], select, textarea{
    width:100%;
    font-family:'IBM Plex Sans', sans-serif;
    font-size:.92rem;
    color: var(--text);
    background:#2a2a2a;
    border:1px solid var(--line);
    border-radius:2px;
    padding:8px 10px;
    transition: border-color 0.2s;
  }
  input[type=text]:focus, input[type=number]:focus, input[type=date]:focus, select:focus, textarea:focus{
    border-color: var(--accent-gold);
    outline: 2px solid var(--accent-gold);
    outline-offset: 1px;
  }
  input::placeholder, textarea::placeholder {
    color: var(--ink-soft) !important;
    opacity: 1;
  }
  input[type=date]{
    color-scheme: dark;
  }
  textarea{resize:vertical; min-height:70px;}
  .cover-dropzone {
    border: 1px dashed var(--line);
    padding: 15px;
    text-align: center;
    background: rgba(0,0,0,0.1);
    border-radius: 2px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: all 0.2s;
  }
  .cover-dropzone:hover {
    border-color: var(--accent-gold);
    color: var(--text);
  }
  .preview-book-container {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    background: rgba(0,0,0,0.15);
    padding: 12px;
    border-radius: 2px;
    border: 1px solid var(--line);
  }
  .preview-cover-box {
    width: 90px;
    height: 130px;
    background: #333;
    border: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: var(--ink-soft);
    text-align: center;
    flex-shrink: 0;
    background-size: cover;
    background-position: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
  }
  .preview-book-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .preview-book-title {
    font-family: 'Fraunces', serif;
    font-size: 1.1rem;
    color: var(--ink);
    margin: 0 0 4px 0;
    line-height: 1.2;
  }
  .preview-book-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
  }

  .isbn-status{
    font-family:'IBM Plex Mono', monospace;
    font-size:.75rem;
    margin-top:5px;
  }
  .isbn-status.ok{color:var(--ok);}
  .isbn-status.bad{color:var(--accent-red);}
  .isbn-status.neutral{color:var(--text-muted);}
  .contributor-row{
    display:grid;
    grid-template-columns:1fr 1fr 1fr auto;
    gap:14px;
    align-items:flex-end;
    margin-bottom:14px;
    border-bottom: 1px dashed var(--line);
    padding-bottom: 14px;
  }
  .contributor-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  @media (max-width:768px){.contributor-row{grid-template-columns:1fr;}}
  .contributor-row button{
    height:36px;
    align-self:end;
  }
  button, .btn-label{
    font-family:'IBM Plex Sans', sans-serif;
    cursor:pointer;
  }
  .btn-ghost{
    background:transparent;
    border:1px solid var(--ink-soft);
    color:var(--ink-soft);
    font-size:.82rem;
    padding:7px 12px;
    border-radius:2px;
  }
  .btn-ghost:hover{background:rgba(255,255,255,0.05);}
  .btn-label {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--line);
    color: var(--accent-gold);
    font-size: .82rem;
    padding: 8px 12px;
    border-radius: 2px;
    background: transparent;
  }
  .btn-label:hover {
    border-color: var(--accent-gold);
    background: rgba(212, 160, 23, 0.05);
  }
  .btn-remove{
    background:transparent;
    border:1px solid var(--line);
    color:var(--accent-red);
    font-size:.82rem;
    padding:8px 12px;
    border-radius:2px;
    height: 38px;
    display: inline-flex;
    align-items: center;
  }
  .btn-remove:hover{
    border-color:var(--accent-red);
    background: rgba(255, 107, 107, 0.05);
  }
  #resetBtn {
    color: var(--accent-red);
    border-color: var(--line);
  }
  #resetBtn:hover {
    border-color: var(--accent-red);
    background: rgba(255, 107, 107, 0.05);
  }
  .proof-wrap{
    position:sticky;
    top:24px;
  }
  .proof{
    position:relative;
    background:var(--card);
    border:1px solid var(--line);
    border-top:none;
    clip-path:polygon(0.0% 0%, 5.56% 2%, 11.11% 0%, 16.67% 2%, 22.22% 0%, 27.78% 2%, 33.33% 0%, 38.89% 2%, 44.44% 0%, 50.0% 2%, 55.56% 0%, 61.11% 2%, 66.67% 0%, 72.22% 2%, 77.78% 0%, 83.33% 2%, 88.89% 0%, 94.44% 2%, 100.0% 0%, 100% 100%, 0% 100%);
    padding:44px 22px 22px;
    transition: transform 0.2s, background-color 0.2s;
  }
  .proof.dragover {
    background-color: var(--drag-bg);
    transform: scale(1.01);
  }
  .proof::before{
    content:"BROUILLON";
    position:absolute;
    top:46%;
    left:50%;
    transform:translate(-50%,-50%) rotate(-18deg);
    font-family:'Fraunces', serif;
    font-size:3.4rem;
    font-weight:600;
    color:var(--ink);
    opacity:.06;
    white-space:nowrap;
    pointer-events:none;
  }
  .proof-head{
    display:flex;
    justify-content:space-between;
    align-items:center;
    margin-bottom:14px;
  }
  .proof-head .eyebrow{margin:0;}
  .status-pill{
    font-family:'IBM Plex Mono', monospace;
    font-size:.7rem;
    padding:3px 9px;
    border-radius:20px;
    border:1px solid var(--line);
    color:var(--text-muted);
  }
  .status-pill.ready{
    color:var(--ok);
    border-color:var(--ok);
  }
  pre#xmlOutput{
    position:relative;
    z-index:1;
    font-family:'IBM Plex Mono', monospace;
    font-size:.76rem;
    line-height:1.55;
    white-space:pre-wrap;
    word-break:break-word;
    max-height:360px;
    overflow-y:auto;
    margin:0 0 18px;
    color:var(--ink-soft);
  }
  .tag{color:#8ad6f2;}
  .val{color:var(--accent-gold);}
  .checklist{
    position:relative;
    z-index:1;
    list-style:none;
    padding:0;
    margin:0 0 18px;
    font-size:.82rem;
  }
  .checklist li{
    display:flex;
    align-items:center;
    gap:8px;
    padding:3px 0;
    color:var(--text-muted);
  }
  .checklist li.done{color:var(--ok);}
  .checklist .mark{
    font-family:'IBM Plex Mono', monospace;
    width:14px;
    display:inline-block;
    color:var(--accent-red);
  }
  .checklist li.done .mark{color:var(--ok);}
  .proof-actions{
    position:relative;
    z-index:1;
    display:flex;
    gap:10px;
    flex-wrap:wrap;
  }
  .btn-primary{
    background:var(--ink);
    color:#fff;
    border:none;
    padding:10px 16px;
    border-radius:2px;
    font-size:.86rem;
    font-weight:500;
  }
  .btn-primary:hover{background:var(--ink-soft);}
  .btn-primary:disabled{
    background:#9a9a90;
    cursor:not-allowed;
  }
footer.note {
    max-width: 800px;
    margin: 64px auto 0;
    padding: 24px;
    border-top: 1px solid var(--line);
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
  }
  footer.note div {
    margin-bottom: 8px;
  }
  footer.note div:last-of-type {
    margin-bottom: 0;
  }
  footer.note .footer-links {
    margin-top: 12px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.8rem;
  }
  footer.note .footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
  }
  footer.note .footer-links a:hover {
    color: var(--accent-gold);
  }
  @media (min-width: 769px) {
    .contributor-row {
      align-items: stretch !important;
    }
    .contributor-row .btn-remove {
      margin-top: auto;
      height: 37px;
    }
  }