/* Online-Lehrbuch SRC & UBI – Layout + Inhaltsstile (baut auf style.css auf) */

/* Über body::before/body::after-Overlays heben (die haben z-index:0) */
.bf-lp-hero,.bf-lp-wrap,.bf-layout,.bf-main,.bf-topbar{position:relative;z-index:1}

/* Kontrast: im gesamten Lehrbuch helle Schrift, kein schwer lesbares Grau.
   Scoped auf die Lehrbuch-Layouts, damit der Rest der Seite unberührt bleibt. */
.bf-layout,.bf-lp-wrap{--text:#eaf1f9;--text2:#ffffff;--text3:#c3cfe0}

/* ---- Layout: Kapitel-Karte (Desktop) + Inhalt ---- */
.bf-layout{display:flex;align-items:flex-start;gap:1.6rem;max-width:1180px;margin:0 auto;padding:0 1rem}
.bf-topbar,.bf-backdrop,.bf-sb-close{display:none}
/* Seitenleiste als frei stehende Karte – kein grauer Trennbalken mehr */
.bf-sidebar{width:264px;flex-shrink:0;position:sticky;top:1rem;align-self:flex-start;max-height:calc(100vh - 1.5rem);overflow-y:auto;border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:1rem .85rem 1.25rem;background:rgba(255,255,255,.025);margin-top:1rem;box-shadow:0 10px 30px -18px rgba(0,0,0,.8)}
.bf-main{flex:1;min-width:0;padding:1.25rem .25rem 3rem}

/* ---- Suche ---- */
.bf-search{position:relative;margin-bottom:1rem}
.bf-search input{width:100%;box-sizing:border-box;background:var(--card,#0f1729);border:1px solid var(--border);border-radius:8px;color:#fff;font-size:.85rem;padding:.55rem .7rem}
.bf-search input::placeholder{color:#8fa8c4;opacity:1}
.bf-search input:focus{outline:none;border-color:var(--accent)}
.bf-results{position:absolute;left:0;right:0;top:calc(100% + 4px);background:#0c1424;border:1px solid var(--border);border-radius:8px;max-height:60vh;overflow-y:auto;z-index:40;box-shadow:0 8px 24px rgba(0,0,0,.5)}
.bf-results a{display:block;padding:.5rem .7rem;text-decoration:none;border-bottom:1px solid var(--border)}
.bf-results a:last-child{border-bottom:none}
.bf-results a:hover,.bf-results a.sel{background:rgba(0,212,255,.08)}
.bf-results .r-ch{font-size:.7rem;color:var(--accent);text-transform:uppercase;letter-spacing:.03em}
.bf-results .r-ttl{font-size:.85rem;color:#fff;font-weight:600;margin:.1rem 0}
.bf-results .r-snip{font-size:.76rem;color:var(--text2);line-height:1.4}
.bf-results .r-snip mark{background:rgba(0,212,255,.25);color:#fff;padding:0 .1em;border-radius:2px}
.bf-results .r-empty{padding:.7rem;font-size:.8rem;color:var(--text2)}

/* ---- Kapitel-Navigation ---- */
.bf-home{display:block;font-size:.83rem;font-weight:700;color:#fff;text-decoration:none;padding:.5rem .55rem;border-radius:7px;margin-bottom:.4rem}
.bf-home:hover,.bf-home.active{background:rgba(0,212,255,.1);color:var(--accent)}
.bf-chapnav{display:flex;flex-direction:column;gap:1px}
.bf-chaplink{display:flex;gap:.55rem;align-items:flex-start;padding:.4rem .55rem;border-radius:7px;text-decoration:none;color:var(--text2);font-size:.82rem;line-height:1.3}
.bf-chaplink:hover{background:rgba(255,255,255,.04);color:#fff}
.bf-chaplink.active{background:rgba(0,212,255,.12);color:#fff}
.bf-chaplink.active .bf-chnum{background:var(--accent);color:#04121f}
.bf-chnum{flex-shrink:0;width:1.4rem;height:1.4rem;border-radius:5px;background:rgba(0,212,255,.1);border:1px solid rgba(0,212,255,.2);color:var(--accent);font-size:.7rem;font-weight:700;display:flex;align-items:center;justify-content:center}
.bf-chttl{padding-top:.05rem}
.bf-chk{margin-left:.3rem;color:#3BAF7E;font-weight:800;flex-shrink:0}
/* Kapitel-Gruppen in der Sidebar (Seefunk / Binnenfunk / …) */
.bf-chapgroup{font-size:.66rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase;padding:.45rem .5rem .3rem;margin:.55rem 0 .15rem;display:flex;align-items:center;gap:.4rem;border-top:1px solid rgba(255,255,255,.09)}
.bf-chapgroup:first-of-type{border-top:none;margin-top:.15rem}
.bf-chapgroup.see{color:#37c9ff}
.bf-chapgroup.binnen{color:#4fd39a}
.bf-chapgroup.ref{color:#e8b44a}
.bf-chapgroup.kat{color:#c4a5f7}
/* Nummern-Badges je Bereich farbig hinterlegt (Nummer + Hintergrund) */
.bf-chaplink.see .bf-chnum{background:rgba(0,212,255,.18);border-color:rgba(0,212,255,.45);color:#5fd4ff}
.bf-chaplink.see.active .bf-chnum{background:#37c9ff;color:#04121f}
.bf-chaplink.binnen .bf-chnum{background:rgba(59,175,126,.2);border-color:rgba(59,175,126,.45);color:#5fe0ac}
.bf-chaplink.binnen.active .bf-chnum{background:#3baf7e;color:#04140d}
.bf-chaplink.binnen.active{background:rgba(59,175,126,.16)}
.bf-chaplink.ref .bf-chnum{background:rgba(232,180,74,.18);border-color:rgba(232,180,74,.42);color:#f0c460}
.bf-chaplink.ref.active .bf-chnum{background:#e8b44a;color:#241a02}
.bf-chaplink.ref.active{background:rgba(232,180,74,.14)}
.bf-chaplink.kat .bf-chnum{background:rgba(196,165,247,.18);border-color:rgba(196,165,247,.42);color:#cfb4fa}
.bf-chaplink.kat.active .bf-chnum{background:#c4a5f7;color:#1c0f36}
.bf-chaplink.kat.active{background:rgba(196,165,247,.14)}

/* ---- Kopfleiste + Schließen-Button (nur Tablet/Mobil aktiv) ---- */
.bf-menubtn{display:inline-flex;align-items:center;gap:.45rem;flex-shrink:0;background:rgba(0,212,255,.14);border:1px solid rgba(0,212,255,.35);color:var(--accent);font-size:.9rem;font-weight:700;padding:.42rem .85rem;border-radius:10px;cursor:pointer}
.bf-menubtn:active{transform:scale(.97)}
.bf-menubtn .bf-burger{font-size:1.05rem;line-height:1}
.bf-topbar-cur{display:flex;align-items:center;gap:.5rem;min-width:0}
.bf-topbar-num{flex:0 0 auto;font-size:.72rem;font-weight:800;color:#04121f;background:var(--accent);border-radius:6px;padding:.12rem .42rem}
.bf-topbar-ttl{font-size:.88rem;font-weight:600;color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ---- Seitenkopf ---- */
.breadcrumb{font-size:.78rem;color:var(--text2);margin-bottom:.7rem}
.breadcrumb a{color:var(--accent);text-decoration:none}
.breadcrumb a:hover{text-decoration:underline}
/* Moderner Seitenkopf: kein harter grauer Balken mehr, sondern eine
   weich auslaufende Akzentlinie unter Titel + Nummer. */
.bf-pagehead{position:relative;display:flex;align-items:center;gap:.9rem;padding-bottom:1rem;margin-bottom:1.5rem}
.bf-pagehead::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--accent) 0%,rgba(0,212,255,.35) 22%,rgba(0,212,255,.08) 55%,transparent 90%)}
.bf-pagenum{flex-shrink:0;width:2.5rem;height:2.5rem;border-radius:12px;background:linear-gradient(150deg,rgba(0,212,255,.9),rgba(0,153,204,.75));border:1px solid rgba(0,212,255,.5);color:#04121f;font-size:1.05rem;font-weight:800;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 14px -4px rgba(0,212,255,.5)}
.bf-pagehead h1{font-size:1.5rem;font-weight:800;color:#fff;margin:0;letter-spacing:-.01em}

/* ---- Inhalt ---- */
.lb-content{font-size:.92rem}
.lb-section{margin:0 0 2.4rem}
.lb-section h2{font-size:1.15rem;font-weight:800;color:#fff;border-bottom:1px solid rgba(255,255,255,.09);padding-bottom:.35rem;margin:2rem 0 1rem;scroll-margin-top:1rem}
.lb-section h3{font-size:1rem;font-weight:700;color:var(--accent);margin:1.5rem 0 .5rem;scroll-margin-top:1rem}
.lb-section h4{font-size:.92rem;font-weight:700;color:#e6edf6;margin:1.1rem 0 .4rem}
.lb-section p{font-size:.92rem;color:var(--text2);line-height:1.8;margin-bottom:.8rem}
.lb-section ul,.lb-section ol{padding-left:1.4rem;margin:.3rem 0 .9rem}
.lb-section li{font-size:.92rem;color:var(--text2);line-height:1.75;margin-bottom:.3rem}
.lb-section li strong,.lb-section strong{color:#fff}
.lb-section em{color:#c3cfe0}
/* Gelb hervorgehobene Schlüsselwörter (Highlighter-Optik auf dunklem Grund) */
.lb-section .bf-hl{background:#f7d94a;color:#1a1200;font-weight:700;border-radius:3px;padding:.02em .3em;box-shadow:0 0 0 1px rgba(247,217,74,.4),0 0 12px -4px rgba(247,217,74,.7);box-decoration-break:clone;-webkit-box-decoration-break:clone}
.lb-section a{color:var(--accent)}
/* Externe Quellen: dezent unterstrichen + Pfeilmarke, lange URLs dürfen umbrechen */
a.bf-ext{color:var(--accent);text-decoration:none;border-bottom:1px solid rgba(0,212,255,.35);word-break:break-word}
a.bf-ext:hover{border-bottom-color:var(--accent)}
a.bf-ext::after{content:"\2197";font-size:.78em;margin-left:.15em;opacity:.75}

/* ---- Kästen ---- */
.info-box{background:rgba(0,212,255,.05);border:1px solid rgba(0,212,255,.2);border-radius:10px;padding:.9rem 1.1rem;font-size:.88rem;color:var(--text2);margin:1.1rem 0;line-height:1.75}
.info-box strong,.info-box b{color:#fff}
.warn-box{background:rgba(239,68,68,.16);border:1px solid rgba(239,68,68,.4);border-radius:10px;padding:.9rem 1.1rem;font-size:.88rem;color:var(--text2);margin:1.1rem 0;line-height:1.75}
.warn-box strong,.warn-box b{color:#f87171}
.tipp-box{background:rgba(234,179,8,.06);border:1px solid rgba(234,179,8,.25);border-radius:10px;padding:.9rem 1.1rem;font-size:.88rem;color:var(--text2);margin:1.1rem 0;line-height:1.75}
.tipp-box strong,.tipp-box b{color:#facc15}
.merksatz{background:linear-gradient(135deg,rgba(0,212,255,.08),rgba(0,212,255,.03));border-left:3px solid var(--accent);border-radius:0 8px 8px 0;padding:.85rem 1rem;font-size:.92rem;color:#fff;font-weight:600;margin:1.25rem 0;line-height:1.6}
/* ---- Kompakte Merk-/Checklisten mit Akzent-Aufzählung (auch auf Kapitel 12 inline definiert) ---- */
.tk-key{color:var(--accent);font-weight:700}
.tk-liste{list-style:none;margin:.55rem 0 .2rem;padding:0}
.tk-liste li{position:relative;padding:.45rem .2rem .45rem 1.45rem;border-top:1px solid rgba(255,255,255,.08);line-height:1.6}
.tk-liste li:first-child{border-top:none}
.tk-liste li::before{content:"";position:absolute;left:.3rem;top:.92rem;width:.42rem;height:.42rem;border-radius:50%;background:var(--accent)}

/* ---- Prüfungsfragen-Hinweis ---- */
.bf-pruef{display:flex;gap:.7rem;background:rgba(168,85,247,.16);border:1px solid rgba(168,85,247,.35);border-radius:10px;padding:.85rem 1rem;margin:1.2rem 0;font-size:.86rem;color:var(--text2);line-height:1.6}
.bf-pruef-ic{font-size:1.2rem;line-height:1}
.bf-pruef strong{color:#d8b4fe;display:block;margin-bottom:.25rem}
.bf-pruef .bf-tag{display:inline-block;font-size:.68rem;font-weight:800;padding:.08rem .4rem;border-radius:4px;margin-right:.4rem;letter-spacing:.03em}
.bf-pruef .bf-tag.src{background:rgba(0,212,255,.18);color:var(--accent)}
.bf-pruef .bf-tag.ubi{background:rgba(34,197,94,.18);color:#4ade80}
.bf-pruef-note{margin-top:.3rem;font-style:italic}
.bf-pruef-link{margin-top:.4rem;font-size:.82rem}
.bf-pruef-link a{color:#d8b4fe;font-weight:600}
.bf-pruef-jump{display:inline-flex;align-items:center;gap:.15rem;text-decoration:none;color:var(--text2);font-weight:600;border-radius:6px;padding:.05rem .15rem;transition:color .15s}
.bf-pruef-jump:hover{color:#fff}
.bf-pruef-jump:hover .bf-tag.src{background:var(--accent);color:#04121f}
.bf-pruef-jump:hover .bf-tag.ubi{background:#4ade80;color:#04121f}

/* ---- Verständnisfragen (Kapitelende, ausklappbar, ohne Scoring) ---- */
.bf-vf{margin:1.3rem 0;padding:.9rem 1.1rem;border:1px solid var(--border);border-radius:10px;background:rgba(0,212,255,.03)}
.bf-vf-lbl{font-family:ui-monospace,monospace;font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:.5rem}
.bf-vf-item{border-top:1px solid var(--border);padding:.55rem 0}
.bf-vf-item:first-of-type{border-top:0;padding-top:0}
.bf-vf-item summary{cursor:pointer;font-weight:600;color:#fff;font-size:.9rem;list-style:none}
.bf-vf-item summary::-webkit-details-marker{display:none}
.bf-vf-item summary::before{content:"\276F";display:inline-block;margin-right:.5rem;color:var(--accent);font-size:.75em;transition:transform .15s}
.bf-vf-item[open] summary::before{transform:rotate(90deg)}
.bf-vf-a{margin-top:.5rem;padding-left:1.3rem;color:var(--text2);font-size:.87rem;line-height:1.6}

/* ---- Tabellen ---- */
.lb-table{width:100%;border-collapse:collapse;font-size:.85rem;margin:1rem 0 1.5rem;background:rgba(0,255,174,.14);border-radius:10px;overflow:hidden;box-shadow:0 4px 16px -8px rgba(0,0,0,.5);backdrop-filter:blur(1px)}
.lb-table th{background:rgba(0,255,174,.24);color:#eaf1f9;font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;padding:.5rem .75rem;text-align:left;border-bottom:2px solid rgba(0,255,174,.4)}
.lb-table td{padding:.5rem .75rem;border-bottom:1px solid rgba(0,255,174,.2);color:#eaf1f9;font-weight:400;vertical-align:top;line-height:1.55;background:rgba(0,255,174,.12)}
.lb-table tbody td:first-child{border-left:3px solid rgba(0,255,174,.55)}
.lb-table tr:hover td{background:rgba(0,255,174,.24)}
.lb-table td.center{text-align:center}

/* ---- Abbildungen ---- */
.lb-figure{background:rgba(255,255,255,.03);border:1px solid var(--border);border-radius:10px;padding:1rem;margin:1.2rem 0;text-align:center}
.lb-figure img{max-width:100%;height:auto;border-radius:6px}
.lb-figure figcaption{font-size:.78rem;color:var(--text2);margin-top:.55rem;font-style:italic}
/* Bilder mit schwacher Auflösung: nur bei breiter Darstellung auf 50 % begrenzen (auf Handy/Tablet voll) */
@media(min-width:1025px){.lb-figure.lb-half{max-width:50%;margin-left:auto;margin-right:auto}}
@media(min-width:1025px){.lb-figure.lb-70{max-width:70%;margin-left:auto;margin-right:auto}}
/* lb-third: auf dem Desktop ein Drittel groß, auf Handy/Tablet etwas größer (70 %) */
.lb-figure.lb-third{max-width:70%;margin-left:auto;margin-right:auto}
@media(min-width:1025px){.lb-figure.lb-third{max-width:33%}}
.lb-figrow{display:flex;flex-wrap:wrap;gap:1rem;justify-content:center}
.lb-figrow figure{flex:1;min-width:160px}
/* Rahmenloses, linksbündiges Bild (ca. 20% kleiner als lb-third) */
.lb-figure.lb-bare{background:none;border:0;border-radius:0;padding:0;text-align:left;margin-left:0;margin-right:auto;max-width:56%}
.lb-figure.lb-bare img{border-radius:0}
@media(min-width:1025px){.lb-figure.lb-bare{max-width:26%}}
/* Rahmenlose, vom Text umflossene Bilder (Float links/rechts) */
.lb-figure.lb-float-right,.lb-figure.lb-float-left{background:none;border:0;border-radius:0;padding:0;text-align:left;max-width:40%}
.lb-figure.lb-float-right{float:right;margin:.2rem 0 .8rem 1.4rem}
.lb-figure.lb-float-left{float:left;margin:.2rem 1.4rem .8rem 0}
.lb-figure.lb-float-right img,.lb-figure.lb-float-left img{border-radius:0}
@media(max-width:768px){.lb-figure.lb-float-right,.lb-figure.lb-float-left{float:none;max-width:70%;margin:1rem 0}}
/* Kleineres, umflossenes Bild */
.lb-figure.lb-float-left.lb-sm,.lb-figure.lb-float-right.lb-sm{max-width:28%}
@media(max-width:768px){.lb-figure.lb-sm{max-width:55%}}
/* Sektionen räumen ihre Floats auf, damit sie nicht in die nächste Sektion ragen */
.lb-section::after{content:"";display:table;clear:both}
/* Bild + Text in einem umrandeten Kasten, Schrift neben dem Bild */
.lb-imgbox{display:flex;gap:1.1rem;align-items:flex-start;background:rgba(255,255,255,.03);border:1px solid var(--border);border-radius:10px;padding:1rem;margin:1.2rem 0}
.lb-imgbox img{flex:0 0 auto;max-width:40%;height:auto;border-radius:6px;align-self:flex-start}
.lb-imgbox.tall img{max-width:30%}
.lb-imgbox p{margin:0}
/* Buch-Titelseite (Handbuch-Cover): rechtsbündig neben dem Text, mit Rahmen */
.lb-figure.lb-cover{float:right;max-width:240px;margin:.2rem 0 1rem 1.4rem}
@media(max-width:768px){.lb-figure.lb-cover{float:none;max-width:60%;margin:1rem auto}}
/* KI-Kennzeichnung an Bildunterschriften: dezent, hellgrau, ohne Rahmen */
.ki-badge{font-size:.72rem;font-style:normal;color:#9aa0a6;margin-left:.4rem}
@media(max-width:768px){.lb-imgbox{flex-direction:column}.lb-imgbox img,.lb-imgbox.tall img{max-width:70%}}
/* Seegebiet-Labels farbig (an den bestehenden Bereichsfarben orientiert) */
.lb-section strong.sg1{color:#37c9ff}
.lb-section strong.sg2{color:#4fe0a8}
.lb-section strong.sg3{color:#e8b44a}
.lb-section strong.sg4{color:#c4a5f7}

/* ---- Vor/Zurück + Fuß ---- */
.bf-prevnext{display:flex;justify-content:space-between;gap:1rem;margin:2rem 0 1rem;border-top:1px solid var(--border);padding-top:1.2rem}
.bf-pn{display:inline-flex;align-items:center;gap:.4rem;max-width:48%;text-decoration:none;color:var(--accent);font-size:.85rem;font-weight:600;background:var(--card,#0f1729);border:1px solid var(--border);border-radius:9px;padding:.6rem .85rem}
.bf-pn:hover{border-color:var(--accent)}
.bf-pn.next{margin-left:auto;text-align:right}
.bf-foot{text-align:center;margin-top:3rem;padding:1.5rem 0 0;background:none;border-top:none;color:var(--text2);font-size:.78rem;line-height:1.7}
.bf-foot a{color:var(--accent);text-decoration:none}

/* ---- Tablet + Mobil: Kopfleiste + Slide-over-Menü ---- */
@media(max-width:1024px){
  .bf-topbar{display:flex;align-items:center;gap:.7rem;position:sticky;top:0;z-index:40;background:rgba(9,15,27,.94);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,.08);padding:.55rem .95rem}
  .bf-backdrop{display:block;position:fixed;inset:0;z-index:55;background:rgba(3,8,15,.55);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}
  .bf-backdrop[hidden]{display:none}
  /* .bf-layout darf hier KEINEN eigenen Stapelkontext bilden (kein z-index-Wert),
     sonst würde die ganze Spalte – inklusive .bf-main mit dem Fließtext – über der
     klebenden Kopfleiste (.bf-topbar, z-index:40) landen und beim Scrollen den
     „Kapitel"-Button überdecken/unklickbar machen. Mit z-index:auto konkurrieren die
     Kinder direkt im Wurzel-Kontext: .bf-main (z-index:1) bleibt UNTER der Kopfleiste,
     .bf-backdrop (55) und .bf-sidebar (60) liegen weiterhin DARÜBER, wenn das Menü offen ist. */
  .bf-layout{flex-direction:column;gap:0;padding:0;z-index:auto}
  .bf-sidebar{position:fixed;left:0;top:0;bottom:0;width:87%;max-width:340px;z-index:60;transform:translateX(-105%);transition:transform .26s ease;background:#0c1424;border:none;border-radius:0;margin:0;max-height:100vh;padding:1.3rem 1rem 2rem;box-shadow:0 0 50px rgba(0,0,0,.65)}
  .bf-sidebar.open{transform:translateX(0)}
  .bf-sb-close{display:block;position:absolute;top:.55rem;right:.65rem;background:none;border:none;color:var(--text2);font-size:1.7rem;line-height:1;cursor:pointer;padding:.1rem .4rem}
  .bf-main{padding:1.1rem 1.15rem 2.5rem;width:100%;box-sizing:border-box}
  .bf-pagehead h1{font-size:1.25rem}
  body.bf-noscroll{overflow:hidden}
}

/* ---- Farbige Scrollbalken passend zum Radar-Design (statt OS-Grau) ----
   bf-style.css wird NUR auf den Lehrbuch-Seiten geladen, daher wirken die
   ungescopten Regeln ausschließlich hier – der Rest der Seite bleibt unberührt. */
html{scrollbar-color:rgba(0,212,255,.42) transparent;scrollbar-width:thin}
.bf-sidebar,.bf-results{scrollbar-color:rgba(0,212,255,.42) transparent;scrollbar-width:thin}
::-webkit-scrollbar{width:11px;height:11px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(0,212,255,.34);border:2px solid transparent;background-clip:padding-box;border-radius:8px}
::-webkit-scrollbar-thumb:hover{background:rgba(0,212,255,.55);background-clip:padding-box}
::-webkit-scrollbar-corner{background:transparent}

/* ---- Prüfungsfragen-Pop-up (bf_pruef → Modal) ---- */
.bf-modal{position:fixed;inset:0;z-index:120;display:flex;align-items:center;justify-content:center;padding:1rem}
.bf-modal[hidden]{display:none!important}
.bf-modal-back{position:absolute;inset:0;background:rgba(3,8,15,.66);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}
.bf-modal-card{position:relative;z-index:1;width:100%;max-width:640px;max-height:86vh;display:flex;flex-direction:column;background:#0c1424;border:1px solid rgba(0,212,255,.35);border-radius:16px;box-shadow:0 30px 70px -20px rgba(0,0,0,.85);overflow:hidden}
.bf-modal-head{display:flex;align-items:center;gap:.8rem;padding:.9rem 1.1rem;border-bottom:1px solid var(--border,#1e3a5f);background:rgba(0,212,255,.06)}
.bf-modal-head h3{margin:0;font-size:.98rem;color:var(--accent,#00d4ff);font-weight:800;flex:1;line-height:1.3}
.bf-modal-x{flex:0 0 auto;width:2rem;height:2rem;border-radius:8px;border:1px solid var(--border,#1e3a5f);background:rgba(255,255,255,.05);color:#fff;font-size:1.4rem;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center}
.bf-modal-x:hover{background:rgba(255,255,255,.12)}
.bf-modal-body{overflow-y:auto;padding:1rem 1.1rem;display:grid;gap:.85rem}
.bf-modal-foot{border-top:1px solid var(--border,#1e3a5f);padding:.7rem 1.1rem;text-align:right}
.bf-modal-foot a{color:var(--accent,#00d4ff);font-weight:600;font-size:.85rem;text-decoration:none}
.bf-mq{border:1px solid var(--border,#1e3a5f);border-radius:10px;padding:.8rem .9rem;background:rgba(255,255,255,.02)}
.bf-mq-head{display:flex;gap:.55rem;align-items:baseline;margin-bottom:.55rem}
.bf-mq-num{flex:0 0 auto;font-size:.72rem;font-weight:800;color:#04121f;background:var(--accent,#00d4ff);border-radius:6px;padding:.12rem .45rem}
.bf-mq-text{font-weight:600;color:#fff;line-height:1.45;font-size:.92rem}
.bf-mq-opts{list-style:none;margin:0;padding:0;display:grid;gap:.35rem}
.bf-mq-opt{display:flex;gap:.55rem;align-items:flex-start;border:1px solid var(--border,#1e3a5f);border-radius:7px;padding:.4rem .55rem;font-size:.86rem;line-height:1.4;color:var(--text,#eaf1f9);background:rgba(255,255,255,.015)}
.bf-mq-opt.correct{background:rgba(59,175,126,.12);border-color:rgba(59,175,126,.6);color:#d6f5e6}
.bf-mq-let{flex:0 0 auto;width:1.4rem;height:1.4rem;border-radius:6px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.74rem;background:rgba(255,255,255,.06);border:1px solid var(--border,#1e3a5f);color:var(--text2,#c3cfe0)}
.bf-mq-opt.correct .bf-mq-let{background:#3BAF7E;border-color:#3BAF7E;color:#04121f}