/* ============================================================================
   HerrKI — zentrales Design-System (EINZIGE globale CSS-Datei, Neuaufbau 2026-09)
   Farben/Typo aus dem Alt-Bestand uebernommen (#0047AB-Blau, #DC143C-Akzent).
   Kapitel-Fragmente nutzen NUR diese Klassen; Modul-Spezialoptik -> kapitel/NNN/stil.css
   ========================================================================== */
:root{
  --hk-blau:#0047AB; --hk-blau-dunkel:#003d99; --hk-blau-hell:#f0f4ff;
  --hk-rot:#DC143C; --hk-rot-dunkel:#b01030; --hk-rot-hell:#fff5f5;
  --hk-gruen:#28a745; --hk-gruen-dunkel:#1e7e34; --hk-gruen-hell:#d4edda;
  --hk-gelb-hell:#fff3cd; --hk-grau-hell:#f8f9fa; --hk-rahmen:#dee2e6;
  --hk-text:#2b2f36; --hk-text-soft:#5a6270;
  --hk-radius:10px; --hk-schatten:0 2px 10px rgba(0,0,0,.08);
  --topbar-h:58px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;font-size:16px;line-height:1.65;
  color:var(--hk-text);background:var(--hk-grau-hell)}
img,canvas,svg,video{max-width:100%;height:auto}
a{color:var(--hk-blau)}

/* ------------------------------------------------ Topbar */
.topbar{position:fixed;top:0;left:0;right:0;height:var(--topbar-h);z-index:60;display:flex;
  align-items:center;gap:.9rem;padding:0 1rem;color:#fff;
  background:linear-gradient(135deg,var(--hk-blau) 0%,var(--hk-blau-dunkel) 100%);
  box-shadow:0 2px 4px rgba(0,0,0,.2)}
.brand{display:flex;align-items:center;gap:.55rem;color:#fff;text-decoration:none;font-size:1.25rem}
.brand-avatar{height:46px;width:46px;border-radius:50%;background:#fff;object-fit:contain;padding:3px;box-shadow:0 1px 4px rgba(0,0,0,.25)}
.brand strong{color:#ffd54d}
.topbar-claim{opacity:.85;font-size:.85rem}
.xp-badge{margin-left:auto;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.35);
  padding:.25rem .7rem;border-radius:999px;font-size:.85rem;white-space:nowrap}
.burger{display:none;background:none;border:0;color:#fff;font-size:1.5rem;cursor:pointer;padding:.2rem .4rem}

/* ------------------------------------------------ Layout + Sidebar */
.layout{display:flex;min-height:100vh;padding-top:var(--topbar-h)}
.sidebar{width:300px;flex:0 0 300px;background:#fff;border-right:1px solid var(--hk-rahmen);
  padding:1rem .9rem 2rem;overflow-y:auto;position:sticky;top:var(--topbar-h);
  height:calc(100vh - var(--topbar-h))}
.nav-kat{margin-bottom:1.1rem}
.nav-kat-titel{font-weight:700;color:var(--hk-blau);padding:.3rem .4rem;font-size:1rem}
.nav-kat-titel small{display:block;font-weight:400;color:var(--hk-text-soft);font-size:.75rem}
.sidebar ul{list-style:none}
.sidebar li a{display:flex;justify-content:space-between;align-items:center;gap:.5rem;
  padding:.5rem .6rem;border-radius:8px;text-decoration:none;color:var(--hk-text);font-size:.92rem}
.sidebar li a:hover{background:var(--hk-blau-hell)}
.sidebar li a.aktiv{background:var(--hk-blau);color:#fff}
.sidebar li a.aktiv .nav-meta{color:#dbe7ff}
.nav-meta{font-size:.72rem;color:var(--hk-text-soft);white-space:nowrap}
.haken{color:var(--hk-gruen);font-weight:700;margin-right:.15rem}
.nav-fuss{margin-top:1rem;padding-top:.8rem;border-top:1px solid var(--hk-rahmen);font-size:.85rem}
.sidebar-overlay{display:none}

/* ------------------------------------------------ Hauptbereich */
.inhalt{flex:1;min-width:0;padding:1.4rem clamp(1rem,3vw,2.5rem) 3rem;max-width:1080px}
.brotkrumen{font-size:.85rem;color:var(--hk-text-soft);margin-bottom:.4rem}
.brotkrumen a{text-decoration:none}
article h1{color:var(--hk-blau);font-size:clamp(1.5rem,3.5vw,2.1rem);margin:.2rem 0 .3rem}
.lead{color:var(--hk-text-soft);font-size:1.05rem;margin-bottom:1rem}
.kapitel-inhalt h2{color:var(--hk-blau);margin:1.6rem 0 .7rem;font-size:1.35rem}
.kapitel-inhalt h3{color:var(--hk-blau-dunkel);margin:1.2rem 0 .5rem;font-size:1.1rem}
.kapitel-inhalt p{margin-bottom:.8rem}
.kapitel-inhalt ul,.kapitel-inhalt ol{margin:0 0 .9rem 1.4rem}
.kapitel-inhalt li{margin-bottom:.3rem}

/* Kapitel-Navigation (oben + unten) */
.kapitel-nav{display:flex;align-items:center;justify-content:space-between;gap:.8rem;
  background:#fff;border:1px solid var(--hk-rahmen);border-radius:var(--hk-radius);
  padding:.6rem .8rem;margin:1rem 0;box-shadow:var(--hk-schatten)}
.kapitel-nav .btn{flex:0 1 auto;max-width:42%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.kapitel-pos{font-size:.8rem;color:var(--hk-text-soft);text-align:center}
.punkte{display:flex;gap:4px;justify-content:center;margin-top:4px}
.punkte i{width:9px;height:9px;border-radius:50%;background:var(--hk-rahmen);display:inline-block}
.punkte i.voll{background:var(--hk-blau)}
.punkte i.fertig{background:var(--hk-gruen)}
.kapitel-fuss{margin-top:2rem;text-align:center}
.kapitel-fuss .btn-erfolg{margin-bottom:1rem}
.platzhalter{opacity:.45;pointer-events:none}

/* ------------------------------------------------ Buttons */
.btn{display:inline-block;background:var(--hk-blau);color:#fff;border:0;border-radius:8px;
  padding:.6rem 1.1rem;font-size:.95rem;font-weight:600;text-decoration:none;cursor:pointer;
  transition:background .15s, transform .05s}
.btn:hover{background:var(--hk-blau-dunkel)}
.btn:active{transform:translateY(1px)}
.btn-secondary{background:#fff;color:var(--hk-blau);border:2px solid var(--hk-blau)}
.btn-secondary:hover{background:var(--hk-blau-hell)}
.btn-erfolg{background:var(--hk-gruen)}
.btn-erfolg:hover{background:var(--hk-gruen-dunkel)}
.btn-erfolg[disabled]{background:var(--hk-gruen-dunkel);cursor:default}
.btn-rot{background:var(--hk-rot)}
.btn-rot:hover{background:var(--hk-rot-dunkel)}
.btn-gross{font-size:1.15rem;padding:.85rem 1.6rem}
button.btn{font-family:inherit}

/* ------------------------------------------------ Inhalts-Bausteine */
.card,.example-card{background:#fff;border:1px solid var(--hk-rahmen);border-radius:var(--hk-radius);
  padding:1.1rem 1.2rem;margin:1rem 0;box-shadow:var(--hk-schatten)}
.info-box{background:var(--hk-blau-hell);border-left:4px solid var(--hk-blau);border-radius:6px;
  padding:.9rem 1rem;margin:1rem 0}
.warn-box{background:var(--hk-gelb-hell);border-left:4px solid #e0a800;border-radius:6px;
  padding:.9rem 1rem;margin:1rem 0}
.erfolg-box{background:var(--hk-gruen-hell);border-left:4px solid var(--hk-gruen);border-radius:6px;
  padding:.9rem 1rem;margin:1rem 0}
.fehler-box{background:var(--hk-rot-hell);border-left:4px solid var(--hk-rot);border-radius:6px;
  padding:.9rem 1rem;margin:1rem 0}
.interactive-box{background:#fff;border:2px solid var(--hk-blau);border-radius:var(--hk-radius);
  padding:1.1rem 1.2rem;margin:1.2rem 0}
.interactive-box h3{margin-top:0}

/* Eingaben */
.input-group{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem;margin:.7rem 0}
.input-group label{font-weight:600;min-width:120px}
.input-group input[type=number],.input-group input[type=text],.input-group select{
  padding:.45rem .6rem;border:1px solid var(--hk-rahmen);border-radius:6px;font-size:.95rem;
  font-family:inherit;min-width:110px}
.input-group input[type=range]{flex:1;min-width:140px;accent-color:var(--hk-blau)}
.input-group input:focus,.input-group select:focus{outline:2px solid var(--hk-blau);outline-offset:1px}
.value-display{font-family:'Courier New',monospace;font-weight:700;color:var(--hk-blau);
  background:var(--hk-blau-hell);padding:.15rem .5rem;border-radius:6px;min-width:3.2em;
  display:inline-block;text-align:center}

/* Code + Konsole */
.code-block,pre.code{background:#1e1e2e;color:#e6e6e6;font-family:'Courier New',monospace;
  font-size:.88rem;line-height:1.55;border-radius:8px;padding:1rem 1.1rem;margin:.9rem 0;
  overflow-x:auto;white-space:pre}
.code-block .keyword{color:#c792ea}.code-block .function{color:#82aaff}
.code-block .number{color:#f78c6c}.code-block .comment{color:#7a7f8a;font-style:italic}
.code-block .string{color:#c3e88d}
code{background:var(--hk-blau-hell);border-radius:4px;padding:.08em .35em;
  font-family:'Courier New',monospace;font-size:.9em}
.output{background:#101418;color:#7CFC98;font-family:'Courier New',monospace;font-size:.88rem;
  border-radius:8px;padding:.9rem 1rem;margin:.7rem 0;min-height:2.6em;overflow-x:auto;white-space:pre-wrap}
.output:empty::before{content:'▶ Ausgabe erscheint hier …';color:#5a6270}

/* Tabellen + Diagramm-Flaechen */
.tabelle-scroll{overflow-x:auto;margin:.9rem 0}
table{border-collapse:collapse;width:100%;background:#fff}
th,td{border:1px solid var(--hk-rahmen);padding:.45rem .6rem;text-align:left;font-size:.92rem}
th{background:var(--hk-blau);color:#fff}
tr:nth-child(even) td{background:var(--hk-grau-hell)}
.chart-container{background:#fff;border:1px solid var(--hk-rahmen);border-radius:var(--hk-radius);
  padding:.8rem;margin:1rem 0;text-align:center}
.chart-container canvas{width:100%!important;max-width:720px;height:auto!important}

/* Quiz */
.quiz{background:#fff;border:2px solid var(--hk-blau);border-radius:var(--hk-radius);
  padding:1.1rem 1.2rem;margin:1.2rem 0}
.quiz-frage{font-weight:700;margin-bottom:.7rem}
.quiz-option{display:block;width:100%;text-align:left;background:var(--hk-grau-hell);
  border:1px solid var(--hk-rahmen);border-radius:8px;padding:.6rem .8rem;margin:.35rem 0;
  cursor:pointer;font-size:.95rem;font-family:inherit}
.quiz-option:hover{background:var(--hk-blau-hell);border-color:var(--hk-blau)}
.quiz-option.richtig{background:var(--hk-gruen-hell);border-color:var(--hk-gruen);font-weight:700}
.quiz-option.falsch{background:var(--hk-rot-hell);border-color:var(--hk-rot)}
.quiz-erklaerung{margin-top:.6rem;font-size:.9rem;color:var(--hk-text-soft)}

/* Tensor-/Matrix-/Vektor-Visualisierung (gemeinsame Grundoptik der Module) */
.tensor-visual,.matrix-viz,.vector-viz{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;
  justify-content:center;margin:.8rem 0}
.matrix-viz{flex-direction:column}
.matrix-row{display:flex;gap:.35rem;justify-content:center}
.matrix-element,.vector-element{min-width:52px;height:52px;display:flex;align-items:center;
  justify-content:center;background:var(--hk-blau-hell);border:2px solid var(--hk-blau);
  border-radius:8px;font-family:'Courier New',monospace;font-weight:700;font-size:1rem;
  padding:.2rem .4rem;transition:transform .12s, background .12s}
.matrix-element:hover,.vector-element:hover{transform:scale(1.08);background:#dfe9ff}
.matrix-element.hervor,.vector-element.hervor{background:var(--hk-rot);border-color:var(--hk-rot-dunkel);color:#fff}
.tensor-card{background:#fff;border:1px solid var(--hk-rahmen);border-radius:var(--hk-radius);
  padding:.9rem 1rem;text-align:center;box-shadow:var(--hk-schatten)}
.tensor-shape,.shape-badge{display:inline-block;background:var(--hk-blau);color:#fff;border-radius:999px;
  padding:.15rem .7rem;font-size:.78rem;font-family:'Courier New',monospace;margin:.2rem 0}
.arrow-down,.transform-arrow{text-align:center;font-size:1.5rem;color:var(--hk-blau);margin:.3rem 0}
.token{display:inline-block;background:var(--hk-blau-hell);border:1px solid var(--hk-blau);
  border-radius:6px;padding:.15rem .5rem;margin:.15rem;font-family:'Courier New',monospace;font-size:.85rem}
.step-indicator{display:inline-flex;align-items:center;justify-content:center;width:2em;height:2em;
  border-radius:50%;background:var(--hk-blau);color:#fff;font-weight:700;margin-right:.5rem}
.circle{border-radius:50%}

/* ------------------------------------------------ Startseite */
.hero{text-align:center;background:linear-gradient(135deg,var(--hk-blau) 0%,var(--hk-blau-dunkel) 100%);
  color:#fff;border-radius:14px;padding:2.2rem 1.4rem;margin-bottom:1.6rem}
.hero h1{color:#fff}
.hero .lead{color:#dbe7ff}
.hero-avatar{width:150px;border-radius:50%;background:#fff;padding:6px;margin-bottom:.8rem}
.hero-text{max-width:720px;margin:.6rem auto 1.2rem}
.hero .btn-gross{background:#ffd54d;color:#243247}
.hero .btn-gross:hover{background:#ffca1a}
.start h2{color:var(--hk-blau);margin:1.8rem 0 .8rem}
.pfad-gitter,.kapitel-gitter{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1rem}
.pfad-karte,.kapitel-karte{background:#fff;border:1px solid var(--hk-rahmen);border-radius:var(--hk-radius);
  padding:1.1rem;box-shadow:var(--hk-schatten);text-decoration:none;color:var(--hk-text);
  transition:transform .12s, box-shadow .12s;position:relative}
.pfad-karte:hover,.kapitel-karte:hover{transform:translateY(-3px);box-shadow:0 6px 18px rgba(0,0,0,.13)}
.pfad-icon{font-size:2rem}
.pfad-karte h3,.kapitel-karte h4{color:var(--hk-blau);margin:.3rem 0 .4rem}
.pfad-stats,.karte-meta{display:block;margin-top:.6rem;font-size:.8rem;color:var(--hk-text-soft)}
.pfad-stats span{margin-right:.9rem}
.karte-nr{position:absolute;top:.7rem;right:.8rem;background:var(--hk-blau-hell);color:var(--hk-blau);
  border-radius:999px;padding:.05rem .55rem;font-size:.75rem;font-weight:700}
.kapitel-karte .haken{position:absolute;top:.6rem;left:.8rem;font-size:1.1rem}
.gitter-kat{margin:1.4rem 0 .6rem;color:var(--hk-blau-dunkel)}
#faq h3{margin:1rem 0 .2rem;color:var(--hk-blau-dunkel)}
.seiten-fuss{margin-top:3rem;padding-top:1rem;border-top:1px solid var(--hk-rahmen);
  font-size:.85rem;color:var(--hk-text-soft);text-align:center}
.fuss-logo{height:26px;width:auto;opacity:.8;margin-bottom:.3rem}
.fuss-logo:hover{opacity:1}

/* ------------------------------------------------ Responsive */
@media (max-width:900px){
  .burger{display:block}
  .topbar-claim{display:none}
  .sidebar{position:fixed;left:0;top:var(--topbar-h);bottom:0;height:auto;z-index:55;
    transform:translateX(-102%);transition:transform .2s;box-shadow:4px 0 18px rgba(0,0,0,.18)}
  .sidebar.offen{transform:none}
  .sidebar-overlay{display:none;position:fixed;inset:var(--topbar-h) 0 0 0;background:rgba(0,0,0,.45);z-index:50}
  .sidebar-overlay.offen{display:block}
  .inhalt{padding:1rem .9rem 2.5rem}
}
@media (max-width:600px){
  body{font-size:15px}
  .kapitel-nav{flex-wrap:wrap}
  .kapitel-nav .btn{max-width:none;flex:1 1 40%}
  .kapitel-pos{order:-1;flex-basis:100%}
  .punkte i{width:7px;height:7px}
  .btn{padding:.65rem 1rem;min-height:44px}          /* Touch-Ziele */
  .quiz-option{min-height:44px}
  .input-group label{min-width:0;flex-basis:100%}
  .matrix-element,.vector-element{min-width:44px;height:44px;font-size:.9rem}
  .hero{padding:1.6rem .9rem}
  .hero-avatar{width:110px}
}

/* 2026-09-03: hidden-Attribut gewinnt immer (Befund Kapitel 440: eigene display-Regeln hebelten es aus) */
[hidden]{display:none!important}