:root{
  --black:#090909;--white:#fff;--blue:#eaf4fa;--line:#cfdae1;
  --ink:#1d1d1d;--muted:#6e6e6e;--max:1420px
}
*{box-sizing:border-box}html,body{margin:0;padding:0}
body{color:var(--ink);background:var(--white);font-family:"Inter",Arial,sans-serif;line-height:1.45}
button,input{font:inherit}
.reader-header{background:var(--black);color:white}
.reader-header-inner{width:min(var(--max),calc(100% - 64px));min-height:112px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:40px}
.reader-brand{text-decoration:none;display:flex;flex-direction:column;align-items:center;line-height:1}
.reader-brand-name{font-family:"Source Serif 4",Georgia,serif;font-size:19px;font-weight:500;letter-spacing:.055em;color:white;text-align:center}
.reader-brand-name span{font-size:1.13em}
.reader-brand-role{margin-top:8px;font-family:"Montserrat",Arial,sans-serif;font-size:11px;letter-spacing:.19em;color:#d1d1d1;text-align:center}
.back-link{color:#e0e0e0;text-decoration:none;font-family:"Montserrat",Arial,sans-serif;font-size:11px;letter-spacing:.06em}
.reader-intro{width:min(1000px,calc(100% - 64px));margin:0 auto;padding:48px 0 34px;text-align:center}
.reader-kicker{margin:0 0 9px;font-family:"Montserrat",Arial,sans-serif;font-size:10px;font-weight:500;letter-spacing:.18em;color:#656565}
.reader-intro h1{margin:0;font-size:34pt;line-height:1.12;font-weight:300;letter-spacing:-.02em}
.reader-intro>p:last-child{margin:10px 0 0;font-size:14pt;font-weight:300;color:var(--muted)}
.reader-shell{width:min(1180px,calc(100% - 64px));margin:0 auto 70px;position:relative}
.reader-toolbar{min-height:64px;padding:10px 14px;background:var(--blue);border:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:18px;position:sticky;top:0;z-index:20}
.toolbar-group{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.reader-toolbar button,.reader-bottom button{border:1px solid #8d99a0;background:white;color:var(--ink);min-height:38px;padding:0 13px;cursor:pointer;font-family:"Montserrat",Arial,sans-serif;font-size:10px;letter-spacing:.055em}
.reader-toolbar button:hover,.reader-bottom button:hover{background:var(--black);border-color:var(--black);color:white}
.reader-toolbar button:disabled,.reader-bottom button:disabled{opacity:.35;cursor:default;background:white;color:var(--ink);border-color:#aab3b8}
.index-button{font-weight:600}
.page-status{display:flex;align-items:center;gap:7px;color:#4f5558;font-family:"Montserrat",Arial,sans-serif;font-size:10px;letter-spacing:.045em}
.page-status label{position:absolute;left:-9999px}
.page-status input{width:62px;height:38px;border:1px solid #8d99a0;background:white;text-align:center;color:var(--ink);outline:none}
#zoomLabel{min-width:45px;text-align:center;color:#4f5558;font-family:"Montserrat",Arial,sans-serif;font-size:10px;letter-spacing:.04em}
.zoom-group button.zoom{width:38px;padding:0;font-size:18px}
.book-stage{min-height:760px;padding:38px 18px 50px;background:#f4f8fa;border-left:1px solid var(--line);border-right:1px solid var(--line);display:flex;justify-content:center;align-items:flex-start;overflow:auto;position:relative}
#pdfCanvas{display:none;max-width:none;background:white;box-shadow:0 14px 34px rgba(0,0,0,.16);user-select:none;-webkit-user-select:none}
.loading{margin-top:130px;padding:18px 26px;background:white;border:1px solid var(--line);color:var(--muted);font-size:13pt;font-weight:300}
.reader-bottom{min-height:70px;padding:15px 14px;background:white;border:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px}
#bottomStatus{color:var(--muted);font-size:11pt}
.reader-note{margin:14px 0 0;text-align:center;color:#7a7a7a;font-size:10.5pt}
.toc-panel{position:fixed;top:0;left:0;width:min(470px,90vw);height:100vh;background:white;z-index:60;box-shadow:12px 0 35px rgba(0,0,0,.22);transform:translateX(-105%);transition:transform .22s ease;display:flex;flex-direction:column}
.toc-panel.open{transform:translateX(0)}
.toc-head{background:var(--black);color:white;min-height:86px;padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.toc-head h2{margin:0;font-size:19pt;font-weight:300}
.toc-close{border:1px solid #777;background:transparent;color:white;width:38px;height:38px;cursor:pointer;font-size:20px}
.toc-list{overflow:auto;padding:18px 0 30px}
.toc-item{width:100%;border:0;border-bottom:1px solid #eceff1;background:white;text-align:left;padding:11px 24px;cursor:pointer;color:var(--ink);font-size:11.5pt;line-height:1.32}
.toc-item:hover{background:var(--blue)}
.toc-item.level-0{font-weight:600;padding-top:16px}
.toc-item.level-1{padding-left:34px}
.toc-item.level-2{padding-left:50px;color:#515151;font-size:10.8pt}
.toc-page{float:right;color:#8a8a8a;margin-left:12px}
.toc-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.28);z-index:50;display:none}
.toc-backdrop.open{display:block}
.reader-footer{min-height:155px;padding:48px max(32px,calc((100% - var(--max))/2));background:var(--black);color:#d0d0d0;display:flex;align-items:flex-start;justify-content:space-between;gap:40px}
.reader-footer p{margin:0 0 7px;font-size:11pt}
@media(max-width:760px){
 .reader-header-inner{width:calc(100% - 28px);min-height:88px}.reader-brand-name{font-size:15px}.reader-brand-role{font-size:9px}.back-link{font-size:9px}
 .reader-intro{width:calc(100% - 28px);padding:34px 0 27px}.reader-intro h1{font-size:27pt}
 .reader-shell{width:100%;margin-bottom:45px}.reader-toolbar{flex-direction:column;align-items:stretch;gap:8px;padding:10px}.toolbar-group{justify-content:center}
 .reader-toolbar button{padding:0 8px;font-size:8.7px}.book-stage{min-height:600px;padding:24px 8px 36px;border-left:0;border-right:0}
 .reader-bottom{padding:12px 8px;gap:8px}.reader-bottom button{padding:0 8px;font-size:8.5px}#bottomStatus{font-size:9pt;text-align:center}
 .reader-note{padding:0 18px}.reader-footer{min-height:135px;padding:38px 22px;flex-direction:column;gap:14px}
}

/* V11 - botones del lector en gris suave */
.reader-toolbar button,
.reader-bottom button{
  background:#eeeeee !important;
  border-color:#b8b8b8 !important;
  color:#1d1d1d !important;
}
.reader-toolbar button:hover,
.reader-bottom button:hover{
  background:#e2e2e2 !important;
  border-color:#9f9f9f !important;
  color:#1d1d1d !important;
}