/* ==========================================================================
   Chemie.KI Design System  ·  v1.0
   Helles, ruhiges Grunddesign (Apple/Bejamas-Anmutung) mit dezenten,
   farbenfrohen Spektral-Akzenten aus dem Chemie.KI-Logo.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1 · Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Basisflächen */
  --bg:          #ffffff;
  --bg-subtle:   #f5f6f8;   /* Abwechselnde Sektionen, Tabellen-Header */
  --surface:     #ffffff;   /* Karten, Modals, Dropdowns */
  --hairline:    #e8e8ed;   /* Feine Trennlinien */
  --border:      #d5d5dc;   /* Sichtbare Rahmen (Inputs) */

  /* Text */
  --text:        #1d1d1f;
  --text-2:      #5c5c63;   /* Sekundärtext */
  --text-3:      #8e8e96;   /* Captions, Placeholder */
  --text-invert: #ffffff;

  /* Marke — abgeleitet aus dem Logo, auf Weiß AA-lesbar */
  --accent:        #0071c2; /* Interaktionsfarbe: Links, Primary Buttons */
  --accent-strong: #035cb0; /* Hover/aktiv, Fokus-Ringe */
  --accent-tint:   #eaf5fc; /* Sanfte Hinterlegung (aktive Menüpunkte etc.) */

  /* Spektrum — Originalfarben aus dem Logo (dekorativ, nie als Fließtext) */
  --sp-cyan:    #00d0e7;
  --sp-sky:     #72c5f9;
  --sp-blue:    #035cb0;
  --sp-navy:    #144091;
  --sp-green:   #00a84f;
  --sp-lime:    #a6cf33;
  --sp-yellow:  #ffcc0a;
  --sp-amber:   #faa61c;
  --sp-orange:  #f0661f;
  --sp-red:     #f21726;
  --sp-magenta: #e30087;
  --sp-purple:  #820d57;

  /* Fertige Verläufe */
  --spectrum: linear-gradient(100deg,
      var(--sp-cyan), var(--sp-blue), var(--sp-magenta), var(--sp-red),
      var(--sp-orange), var(--sp-yellow), var(--sp-green), var(--sp-cyan));
  --spectrum-conic: conic-gradient(from var(--angle, 0deg),
      var(--sp-cyan), var(--sp-blue), var(--sp-magenta), var(--sp-red),
      var(--sp-orange), var(--sp-yellow), var(--sp-green), var(--sp-cyan));

  /* Status */
  --ok:      #1a9a56;
  --ok-bg:   #e7f6ee;
  --warn:    #b96a00;
  --warn-bg: #fdf3e2;
  --danger:  #d92c20;
  --danger-bg: #fdecea;

  /* Typografie */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", Consolas, monospace;

  /* Radien */
  --radius-s:    8px;
  --radius-m:    12px;
  --radius-l:    18px;
  --radius-pill: 999px;

  /* Schatten */
  --shadow-s: 0 1px 2px rgba(29, 29, 31, .06), 0 2px 8px rgba(29, 29, 31, .05);
  --shadow-m: 0 4px 12px rgba(29, 29, 31, .08), 0 12px 32px rgba(29, 29, 31, .08);
  --shadow-l: 0 8px 24px rgba(29, 29, 31, .12), 0 24px 64px rgba(29, 29, 31, .16);

  /* Bewegung */
  --ease: cubic-bezier(.32, .72, .24, 1);
  --t-fast: .18s;
  --t-med:  .32s;
}

/* Rotierender Winkel für Conic-Gradients (Funkel-Border) */
@property --angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

/* --------------------------------------------------------------------------
   2 · Basis
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  line-height: 1.15;
  letter-spacing: -.02em;
  font-weight: 650;
  margin: 0 0 .5em;
}
h1 { font-size: clamp(2.1rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; }

p  { margin: 0 0 1em; }

.display {
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1.05;
}
.lead     { font-size: 1.25rem; color: var(--text-2); line-height: 1.55; }
.text-2   { color: var(--text-2); }
.text-3   { color: var(--text-3); font-size: .875rem; }
.eyebrow {
  display: block;
  font-size: .8rem;
  font-weight: 650;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .75rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }

code {
  font-family: var(--font-mono);
  font-size: .85em;
  background: var(--bg-subtle);
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: .1em .4em;
}

/* --------------------------------------------------------------------------
   2b · Layout-Container
   --------------------------------------------------------------------------
   .wrap       – Standard für Inhaltsseiten (Text, Formulare, FAQ)
   .wrap-wide  – Breite Variante für den Forschungsbereich
                 (große Tabellen, Auswertungen, Heatmaps)
   -------------------------------------------------------------------------- */
.wrap,
.wrap-wide {
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
}
.wrap      { max-width: 1080px; }
.wrap-wide { max-width: 1480px; }

/* --------------------------------------------------------------------------
   3 · Spektrum-Effekte („Funkeln")
   --------------------------------------------------------------------------
   Drei Bausteine:
   .text-spectrum   – Text als animierter Farbverlauf (Headlines, Wortmarke)
   .link-funkeln    – Link: Farbe rotiert dezent, Regenbogen-Unterstreichung
   .sparkle         – Border-Glow: rotierender Spektralring + weicher Schein
   Alle Effekte laufen nur bei :hover/:focus-visible und respektieren
   prefers-reduced-motion.
   -------------------------------------------------------------------------- */

/* 3a · Gradient-Text (für Hero-Headlines / Markenmomente) */
.text-spectrum {
  background: var(--spectrum);
  background-size: 300% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: ck-spectrum-slide 14s linear infinite;
}

/* 3b · Funkelnde Links: Textfarbe rotiert durch dunkle (lesbare!) Logo-
   Töne und glüht dabei weich in der jeweils aktuellen Farbe. Der Glow
   folgt über currentColor automatisch der Farbrotation. */
.link-funkeln {
  color: var(--accent);
  font-weight: 550;
  transition: text-shadow var(--t-fast) var(--ease);
}
.link-funkeln:hover,
.link-funkeln:focus-visible {
  animation: ck-funkeln-text 2.4s linear infinite;
  text-shadow:
    0 0 14px color-mix(in srgb, currentColor 65%, transparent),
    0 0 3px  color-mix(in srgb, currentColor 25%, transparent);
}

/* 3c · Funkel-Border mit Glow: rotierender Spektralring (::before als
   Maskenring) + weich geblurter Schein dahinter (::after). Der Inhalt
   selbst bleibt unangetastet → Lesbarkeit bleibt erhalten. */
.sparkle {
  position: relative;
  isolation: isolate;
}
.sparkle::before,
.sparkle::after {
  content: "";
  position: absolute;
  border-radius: inherit;
  background: var(--spectrum-conic);
  opacity: 0;
  transition: opacity var(--t-med) var(--ease);
  pointer-events: none;
}
/* Ring: Gradient auf 2px Randbreite maskiert */
.sparkle::before {
  inset: -2px;
  padding: 2px;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
          mask-composite: exclude;
}
/* Glow: gleicher Gradient, weich geblurt hinter dem Element. Eine sanfte
   radiale Maske spart nur die unmittelbare Textzone in der Mitte aus,
   damit der Schein die Beschriftung nicht auswäscht. */
.sparkle::after {
  inset: -3px;
  filter: blur(14px);
  z-index: -1;
}
.sparkle:hover::before,
.sparkle:focus-visible::before { opacity: 1; animation: ck-rotate 3.5s linear infinite; }
.sparkle:hover::after,
.sparkle:focus-visible::after  { opacity: .35; animation: ck-rotate 3.5s linear infinite; }

@keyframes ck-rotate { to { --angle: 360deg; } }

@keyframes ck-spectrum-slide {
  from { background-position-x: 0%; }
  to   { background-position-x: 300%; }
}

/* Nur dunkle, auf Weiß gut lesbare Logo-Töne für Fließtext-Funkeln */
@keyframes ck-funkeln-text {
  0%, 100% { color: var(--sp-blue); }
  25%      { color: var(--sp-purple); }
  50%      { color: #a60d17; }
  75%      { color: #00783b; }
}

/* --------------------------------------------------------------------------
   4 · Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  font: inherit;
  font-size: .95rem;
  font-weight: 550;
  line-height: 1;
  padding: .72em 1.5em;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease);
}
.btn:active { transform: scale(.97); }
.btn:focus-visible { outline: 2px solid var(--accent-strong); outline-offset: 2px; }

.btn-primary {
  background: var(--accent);
  color: var(--text-invert);
}
.btn-primary:hover { background: var(--accent-strong); }

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--text-3); }

.btn-ghost {
  background: transparent;
  color: var(--accent);
}
.btn-ghost:hover { background: var(--accent-tint); color: var(--accent-strong); }

.btn-danger {
  background: var(--surface);
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 35%, transparent);
}
.btn-danger:hover { background: var(--danger-bg); border-color: var(--danger); }

.btn-sm { font-size: .82rem; padding: .55em 1.1em; }
.btn-lg { font-size: 1.05rem; padding: .85em 1.9em; }

/* Sparkle-Varianten: Rahmen weicht dem rotierenden Ring */
.btn.sparkle:hover,
.btn.sparkle:focus-visible { border-color: transparent; }

/* Mini-Logo-Loader – kompakte Variante der Facet-Glow-Animation aus
   design/logo-loader.html, für Lade-Zustände, wo eine KI-Anfrage läuft
   (z. B. Buttons statt eines generischen Spinners). */
.ck-loader {
  position: relative;
  display: inline-block;
  width: 1.4em;
  height: 1.4em;
  aspect-ratio: 713.5 / 748.3;
  vertical-align: middle;
}
.ck-loader .aura {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: blur(4px) saturate(1.15);
  opacity: .4;
  transform: scale(1.15);
  animation: auraBreathe 10s var(--ease) infinite;
}
.ck-loader .ck-logo {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  overflow: visible;
}
.ck-loader .ck-logo :is(polygon, path) {
  transform-box: fill-box;
  transform-origin: center;
  animation: facetGlow 10s linear infinite both;
  filter: drop-shadow(0 0 var(--gr) var(--gc)) brightness(calc(1 + .55 * var(--gi))) saturate(calc(1 + .6 * var(--gi)));
}
@media (prefers-reduced-motion: reduce) {
  .ck-loader .ck-logo :is(polygon, path) { animation: none; filter: none; }
  .ck-loader .aura { animation: none; opacity: .4; }
}

/* --------------------------------------------------------------------------
   5 · Navigation
   -------------------------------------------------------------------------- */
.nav-ck {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
  height: 60px;
  background: rgba(255, 255, 255, .78);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--hairline);
}
.nav-ck .brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -.01em;
  color: var(--text);
}
.nav-ck .brand img { width: 30px; height: 30px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-left: auto;
}

/* Die Leiste zerfällt in drei Zonen: die Seitenlinks sitzen gemeinsam auf
   einer hellgrauen Schiene, daneben stehen die Codeeingabe für Lernende und
   der Anmelden-Button für Lehrkräfte. Alle drei sind 42px hoch, sonst franst
   die Zeile aus. */
.nav-group {
  display: inline-flex;
  align-items: stretch;
  gap: 2px;
  height: 42px;
  padding: 4px;
  background: var(--bg-subtle);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
}
.nav-group > a,
.nav-item-dd > button {
  display: inline-flex;
  align-items: center;
  font: inherit;
  font-size: .92rem;
  font-weight: 500;
  color: var(--text-2);
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0 .9em;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.nav-group > a:hover,
.nav-item-dd > button:hover { color: var(--text); background: rgba(255, 255, 255, .65); }
/* Die aktive Seite hebt sich als weißes Segment aus der Schiene heraus. */
.nav-group > a.active {
  color: var(--text);
  background: var(--surface);
  box-shadow: var(--shadow-s);
}

/* Direkteingabe des Testcodes: ein Schritt weniger als über einen Dialog.
   Zum Fokus bewusst ohne den hellen Ring des Formular-Standards – er würde
   die Pille optisch aufblähen. Stattdessen färbt sich der Rahmen in die
   Akzentfarbe und der Pfeilknopf füllt sich mit dem Logospektrum. */
.nav-code {
  display: inline-flex;
  align-items: center;
  /* Das Element ist ein <form>; ohne diese Zeile schiebt dessen Standard-
     Außenabstand die Pille aus der Mitte der Leiste nach oben. */
  margin: 0;
  height: 42px;
  padding: 0 4px 0 .95rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface);
  transition: border-color var(--t-fast) var(--ease);
}
.nav-code:hover { border-color: var(--text-3); }
.nav-code:focus-within { border-color: var(--accent); }
.nav-code.is-invalid { border-color: var(--danger); }
/* [type="text"] mitgeschrieben, damit die Regel die allgemeine Formularregel
   weiter unten in dieser Datei überstimmt – sonst holt sich das Feld dort
   wieder Rahmen, Radius und Polsterung. */
.nav-code input[type="text"] {
  width: 7em;
  padding: .25em 0;
  min-height: 0;
  border: 0;
  background: none;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: .85rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}
/* Beide Ringe abbestellen: outline vom Browser, box-shadow von der globalen
   input:focus-Regel weiter unten in dieser Datei. */
.nav-code input[type="text"]:focus,
.nav-code input[type="text"]:focus-visible {
  outline: none;
  box-shadow: none;
  border: 0;
  background: none;
}
.nav-code input[type="text"]::placeholder {
  letter-spacing: normal;
  text-transform: none;
  color: var(--text-3);
}
.nav-code-go {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  min-height: 0;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: .78rem;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease);
}
/* Bei aktiver Eingabe füllt sich der Knopf mit dem rotierenden Logospektrum –
   dieselbe Anmutung wie die .sparkle-Karten der Startseite, hier als Fläche
   statt als Rand. Der zweifarbige Schein ersetzt den geblurten Glow des
   Originals; auf 32px würde der die eigene Fläche auswaschen. */
.nav-code:focus-within .nav-code-go {
  background: var(--spectrum-conic);
  animation: ck-rotate 3.5s linear infinite;
  box-shadow: 0 2px 10px color-mix(in srgb, var(--sp-magenta) 35%, transparent),
              0 -2px 10px color-mix(in srgb, var(--sp-cyan) 35%, transparent);
}
/* Der weiße Pfeil läuft über Gelb und Lime; der dunkle Schein hält ihn auch
   dort lesbar. */
.nav-code-go i { text-shadow: 0 1px 3px rgba(29, 29, 31, .45); }
@media (prefers-reduced-motion: reduce) {
  .nav-code:focus-within .nav-code-go { animation: none; }
}

/* Dropdown */
.nav-item-dd { position: relative; display: flex; }
.nav-item-dd > button::after {
  content: "";
  display: inline-block;
  margin-left: .45em;
  width: .5em; height: .5em;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--t-fast) var(--ease);
}
.dd-menu {
  position: absolute;
  /* Der Trigger ist 32px hoch, die Schiene mit Polsterung und Rahmen 42px –
     der Abstand rechnet die fehlenden 5px mit, damit das Menü 10px unter der
     Schiene beginnt und nicht unter dem Trigger. */
  top: calc(100% + 15px);
  left: 0;
  min-width: 230px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-m);
  padding: .4rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease),
              visibility var(--t-fast);
}
.nav-item-dd:hover .dd-menu,
.nav-item-dd:focus-within .dd-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-item-dd:hover > button::after,
.nav-item-dd:focus-within > button::after { transform: rotate(225deg) translateY(-1px); }
.dd-menu a {
  display: block;
  padding: .55em .85em;
  border-radius: var(--radius-s);
  color: var(--text);
  font-size: .92rem;
}
.dd-menu a:hover { background: var(--accent-tint); color: var(--accent-strong); }
.dd-menu hr { border: 0; border-top: 1px solid var(--hairline); margin: .4rem .5rem; }
.dd-menu .dd-caption {
  display: block;
  padding: .5em .85em .2em;
  font-size: .72rem;
  font-weight: 650;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-3);
}

/* --------------------------------------------------------------------------
   6 · Breadcrumb
   -------------------------------------------------------------------------- */
.breadcrumb-ck {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .35rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: .875rem;
}
.breadcrumb-ck a { color: var(--text-2); }
.breadcrumb-ck a:hover { color: var(--accent-strong); }
.breadcrumb-ck li + li::before {
  content: "/";
  color: var(--text-3);
  margin-right: .35rem;
}
.breadcrumb-ck [aria-current] { color: var(--text); font-weight: 550; }

/* --------------------------------------------------------------------------
   6b · Seitenkopf (Innenseiten)
   --------------------------------------------------------------------------
   Ersetzt das dunkle Foto-Hero auf Innenseiten: ruhiger, heller Kopf mit
   optionalem Breadcrumb, Eyebrow, H1 und Beta-Hinweis. Kein Marketing-Hero
   wie auf der Startseite.
   -------------------------------------------------------------------------- */
.page-head {
  padding: clamp(2rem, 5vw, 3.25rem) 0 clamp(1.75rem, 4vw, 2.5rem);
  background:
    radial-gradient(60% 100% at 15% 0%, color-mix(in srgb, var(--sp-cyan) 6%, transparent), transparent 70%),
    var(--bg);
  border-bottom: 1px solid var(--hairline);
}
.page-head .breadcrumb-ck { margin-bottom: 1rem; }
.page-head h1 { margin-bottom: .35rem; }
.page-head .page-head-row { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; }
.page-head .lead { margin: .5rem 0 0; max-width: 60ch; }

/* --------------------------------------------------------------------------
   7 · Karten
   -------------------------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-l);
  padding: 1.75rem;
  transition: box-shadow var(--t-med) var(--ease), transform var(--t-med) var(--ease);
}
.card:hover { box-shadow: var(--shadow-m); }
.card.card-lift:hover { transform: translateY(-3px); }

/* --------------------------------------------------------------------------
   8 · Tabellen — genau EIN Tabellenstil für die ganze Seite
   -------------------------------------------------------------------------- */
.table-wrap {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  overflow-x: auto;
  background: var(--surface);
}
.table-ck {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
}
.table-ck th {
  text-align: left;
  font-size: .78rem;
  font-weight: 650;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-3);
  background: var(--bg-subtle);
  padding: .8rem 1.1rem;
  border-bottom: 1px solid var(--hairline);
  white-space: nowrap;
}
.table-ck td {
  padding: .85rem 1.1rem;
  border-bottom: 1px solid var(--hairline);
  vertical-align: middle;
}
.table-ck tbody tr:last-child td { border-bottom: 0; }
.table-ck tbody tr { transition: background var(--t-fast) var(--ease); }
.table-ck tbody tr:hover { background: var(--bg-subtle); }
.table-ck .num { text-align: right; font-variant-numeric: tabular-nums; }

/* Kompakte Variante für datenreiche Ansichten (Forschung, Auswertungen):
   kleinere Schrift, engeres Padding, Zebra-Streifen statt reiner Hairlines */
.table-ck.table-compact { font-size: .82rem; }
.table-ck.table-compact th { padding: .5rem .7rem; font-size: .7rem; }
.table-ck.table-compact td { padding: .45rem .7rem; border-bottom: 0; }
.table-ck.table-compact tbody tr:nth-child(even) { background: var(--bg-subtle); }
.table-ck.table-compact tbody tr:hover { background: var(--accent-tint); }

/* --------------------------------------------------------------------------
   9 · Badges & Status
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  font-size: .78rem;
  font-weight: 550;
  padding: .25em .8em;
  border-radius: var(--radius-pill);
  background: var(--bg-subtle);
  color: var(--text-2);
  /* Bootstrap bringt für .badge ein eigenes white-space: nowrap mit, das
     sonst hier durchschlägt: Ein Badge mit längerem Text (z. B. „Chemie.KI-
     Kern" neben einem Themennamen oder „KI-Modellstärke: …") kann dann nicht
     umbrechen und sprengt auf schmalen Bildschirmen die Karte. */
  white-space: normal;
}
.badge::before {
  content: "";
  width: .5em; height: .5em;
  border-radius: 50%;
  background: currentColor;
}
.badge-ok     { background: var(--ok-bg);     color: var(--ok); }
.badge-warn   { background: var(--warn-bg);   color: var(--warn); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info   { background: var(--accent-tint); color: var(--accent-strong); }
.badge-plain::before { display: none; }

/* --------------------------------------------------------------------------
   9b · Hinweise (Formular-Rückmeldungen)
   --------------------------------------------------------------------------
   Ersetzt Bootstrap-„alert" auf frisch gebauten Seiten (Login, Account,
   Formulare) mit den semantischen Statusfarben aus Abschnitt 9.
   -------------------------------------------------------------------------- */
.notice {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  padding: .9rem 1.1rem;
  border-radius: var(--radius-m);
  font-size: .92rem;
  line-height: 1.5;
  margin-bottom: 1.25rem;
}
.notice-ok     { background: var(--ok-bg);     color: var(--ok); }
.notice-danger { background: var(--danger-bg); color: var(--danger); }
.notice-warn   { background: var(--warn-bg);   color: var(--warn); }
.notice-info   { background: var(--accent-tint); color: var(--accent-strong); }
.notice a { color: inherit; text-decoration: underline; }
.notice ul { margin: 0; padding-left: 1.1em; }

/* --------------------------------------------------------------------------
   10 · Formulare
   -------------------------------------------------------------------------- */
.field { margin-bottom: 1.25rem; }
.field label {
  display: block;
  font-size: .875rem;
  font-weight: 550;
  margin-bottom: .4rem;
}
.field .hint { font-size: .8rem; color: var(--text-3); margin-top: .35rem; }

.input, .select, .textarea {
  width: 100%;
  font: inherit;
  font-size: .95rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  padding: .65em .9em;
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.input::placeholder, .textarea::placeholder { color: var(--text-3); }
.input:hover, .select:hover, .textarea:hover { border-color: var(--text-3); }
.input:focus, .select:focus, .textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3.5px color-mix(in srgb, var(--accent) 18%, transparent);
}
.textarea { resize: vertical; min-height: 6em; }
.input:disabled, .select:disabled, .textarea:disabled {
  background: var(--bg-subtle);
  color: var(--text-2);
  cursor: not-allowed;
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5' fill='none' stroke='%235c5c63' stroke-width='1.8' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .9em center;
  padding-right: 2.5em;
}

/* Validierung */
.field.is-invalid .input,
.field.is-invalid .textarea { border-color: var(--danger); }
.field.is-invalid .input:focus {
  box-shadow: 0 0 0 3.5px color-mix(in srgb, var(--danger) 15%, transparent);
}
.field.is-invalid .error {
  display: block;
  font-size: .8rem;
  color: var(--danger);
  margin-top: .35rem;
}
.field.is-valid .input { border-color: var(--ok); }

/* Kurzform, falls die is-invalid/is-valid-Klasse direkt am Feld statt am
   umschließenden .field sitzt (z. B. reine JS-Validierung ohne Wrapper). */
.input.is-invalid, .select.is-invalid, .textarea.is-invalid { border-color: var(--danger); }
.input.is-valid,   .select.is-valid,   .textarea.is-valid   { border-color: var(--ok); }

/* Checkbox */
.check {
  display: flex;
  align-items: flex-start;
  gap: .6rem;
  font-size: .92rem;
  cursor: pointer;
}
.check input {
  appearance: none;
  flex: 0 0 auto;
  width: 1.15rem; height: 1.15rem;
  margin-top: .15rem;
  border: 1.5px solid var(--border);
  border-radius: 5px;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.check input:checked {
  background: var(--accent)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='8'%3E%3Cpath d='M1 4 4 7 9 1' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center / 10px no-repeat;
  border-color: var(--accent);
}

/* Switch / Toggle */
.switch {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  font-size: .92rem;
  cursor: pointer;
}
.switch input {
  appearance: none;
  width: 2.6rem; height: 1.5rem;
  border-radius: var(--radius-pill);
  background: var(--border);
  position: relative;
  cursor: pointer;
  transition: background var(--t-med) var(--ease);
}
.switch input::before {
  content: "";
  position: absolute;
  inset: 2px auto 2px 2px;
  width: calc(1.5rem - 4px);
  border-radius: 50%;
  background: #fff;
  box-shadow: var(--shadow-s);
  transition: translate var(--t-med) var(--ease);
}
.switch input:checked { background: var(--ok); }
.switch input:checked::before { translate: 1.1rem 0; }

/* --------------------------------------------------------------------------
   11 · Accordion (natives <details>)
   -------------------------------------------------------------------------- */
.accordion {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  background: var(--surface);
  overflow: hidden;
}
.accordion details + details { border-top: 1px solid var(--hairline); }
.accordion summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.4rem;
  font-weight: 550;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease);
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary:hover { background: var(--bg-subtle); }
.accordion summary::after {
  content: "";
  flex: 0 0 auto;
  width: .6em; height: .6em;
  border-right: 1.5px solid var(--text-3);
  border-bottom: 1.5px solid var(--text-3);
  transform: rotate(45deg);
  transition: transform var(--t-med) var(--ease);
}
.accordion details[open] summary::after { transform: rotate(225deg); }
.accordion .acc-body {
  padding: 1.4rem 1.4rem 1.25rem;
  border-top: 1px solid var(--hairline);
  color: var(--text-2);
  font-size: .95rem;
}

/* Feedback-Akkordeon (Feed Up · Feed back · Feed forward): Der Fließtext ist
   hier Inhalt, kein Beiwerk, und steht deshalb in voller Textfarbe. Die
   Kriterientabelle sitzt randlos im Body – ihre Zellen richten sich am
   Innenabstand der Zusammenfassung aus, statt einen zweiten Kasten mit
   eigenem Rand und doppeltem Weißraum aufzuziehen. */
.accordion.ck-feedback .acc-body { color: var(--text); }
.accordion.ck-feedback .acc-body-table { padding: 0; }
.accordion.ck-feedback .acc-body-table .table-wrap {
  border: 0;
  border-radius: 0;
  background: transparent;
}
.accordion.ck-feedback .acc-body-table :is(th, td):first-child { padding-left: 1.4rem; }
.accordion.ck-feedback .acc-body-table :is(th, td):last-child  { padding-right: 1.4rem; }
@media (max-width: 640px) {
  .accordion.ck-feedback .acc-body { padding: 1.1rem 1.1rem 1rem; }
  .accordion.ck-feedback .acc-body-table { padding: 0; }
  .accordion.ck-feedback .acc-body-table :is(th, td):first-child { padding-left: 1.1rem; }
  .accordion.ck-feedback .acc-body-table :is(th, td):last-child  { padding-right: 1.1rem; }
}

/* --------------------------------------------------------------------------
   12 · Modal (natives <dialog>)
   -------------------------------------------------------------------------- */
.modal-ck {
  border: 0;
  border-radius: var(--radius-l);
  background: var(--surface);
  box-shadow: var(--shadow-l);
  padding: 0;
  width: min(480px, calc(100vw - 2rem));
}
.modal-ck::backdrop {
  background: rgba(29, 29, 31, .4);
  backdrop-filter: blur(6px);
}
.modal-ck[open] { animation: ck-modal-in var(--t-med) var(--ease); }
@keyframes ck-modal-in {
  from { opacity: 0; transform: translateY(14px) scale(.98); }
  to   { opacity: 1; transform: none; }
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.4rem 1.6rem 0;
}
.modal-head h3 { margin: 0; }
.modal-body  { padding: 1rem 1.6rem; color: var(--text-2); }
.modal-foot {
  display: flex;
  justify-content: flex-end;
  gap: .6rem;
  padding: 0 1.6rem 1.4rem;
}
.modal-close {
  border: 0;
  background: var(--bg-subtle);
  color: var(--text-2);
  width: 2rem; height: 2rem;
  border-radius: 50%;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.modal-close:hover { background: var(--hairline); color: var(--text); }

/* --------------------------------------------------------------------------
   12b · Login/Auth-Rahmen
   --------------------------------------------------------------------------
   Zentrierte Karte auf ruhigem, sanft schimmerndem Grund für Login,
   Registrierung, Passwort vergessen/zurücksetzen, Verifikation. Kein
   Hero, keine Navigation – maximale Ruhe für den Anmeldevorgang.
   -------------------------------------------------------------------------- */
.login-frame {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
  background:
    radial-gradient(70% 55% at 50% -10%, color-mix(in srgb, var(--sp-sky) 12%, transparent), transparent 70%),
    var(--bg-subtle);
}
.login-card {
  width: min(400px, 100%);
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-m);
  padding: clamp(1.75rem, 5vw, 2.5rem);
  text-align: center;
}
.login-card .login-logo { width: 52px; margin-bottom: .5rem; }
.login-card h1 { font-size: 1.5rem; margin-bottom: .25rem; }
.login-card .login-subtitle { color: var(--text-3); font-size: .92rem; margin: 0 0 .5rem; }
.login-card form { text-align: left; margin-top: 1.25rem; }
.login-card .login-links { margin-top: 1.25rem; font-size: .875rem; }
.login-card .login-links + .login-links { margin-top: .5rem; }

/* --------------------------------------------------------------------------
   13 · Toast
   -------------------------------------------------------------------------- */
.toast-ck {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  translate: -50% 0;
  display: flex;
  align-items: center;
  gap: .7rem;
  background: var(--text);
  color: var(--text-invert);
  font-size: .92rem;
  padding: .8em 1.4em;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-l);
  z-index: 100;
  animation: ck-toast-in var(--t-med) var(--ease);
}
.toast-ck .dot { width: .55em; height: .55em; border-radius: 50%; background: var(--sp-green); }
@keyframes ck-toast-in {
  from { opacity: 0; translate: -50% 12px; }
  to   { opacity: 1; translate: -50% 0; }
}

/* --------------------------------------------------------------------------
   14 · Chat (helle Variante der bisherigen Dark-Chat-Karte)
   -------------------------------------------------------------------------- */
.chat-ck {
  display: flex;
  flex-direction: column;
  gap: .9rem;
}
.chat-msg {
  display: flex;
  gap: .7rem;
  max-width: 85%;
}
.chat-msg.out { align-self: flex-end; flex-direction: row-reverse; }
.chat-msg .avatar {
  flex: 0 0 auto;
  width: 2rem; height: 2rem;
  border-radius: 50%;
  background: var(--bg-subtle);
  display: grid;
  place-items: center;
  overflow: hidden;
}
.chat-msg .avatar img { width: 70%; height: 70%; }
.chat-bubble {
  padding: .7em 1em;
  border-radius: var(--radius-m);
  font-size: .95rem;
  line-height: 1.5;
}
.chat-msg.in  .chat-bubble {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-bottom-left-radius: 4px;
}
.chat-msg.out .chat-bubble {
  background: var(--accent-tint);
  color: var(--text);
  border-bottom-right-radius: 4px;
}

/* --------------------------------------------------------------------------
   14b · Footer
   --------------------------------------------------------------------------
   Heller Footer auf grauer Fläche; die feine Spektrum-Linie an der
   Oberkante ist der einzige dauerhafte Markenmoment der Seite.
   -------------------------------------------------------------------------- */
.footer-ck {
  margin-top: 5rem;
  background: var(--bg-subtle);
  border-top: 2px solid transparent;
  border-image: var(--spectrum) 1;
  font-size: .9rem;
}
.footer-ck .footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  /* padding-block statt Kurzform: sonst überschreibt diese Regel die seitliche
     Einrückung von .wrap und der Footer klebt auf Telefonen am linken Rand. */
  padding-block: 3.5rem 2.5rem;
}
.footer-ck .footer-brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: .75rem;
}
.footer-ck .footer-brand img { width: 28px; height: 28px; }
.footer-ck .footer-claim { color: var(--text-2); max-width: 34ch; margin: 0; }
.footer-ck h5 {
  margin: 0 0 .9rem;
  font-size: .78rem;
  font-weight: 650;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-3);
}
.footer-ck ul { list-style: none; margin: 0; padding: 0; }
.footer-ck li { margin-bottom: .55rem; }
.footer-ck li a { color: var(--text-2); }
.footer-ck li a:hover { color: var(--accent-strong); }
.footer-ck .footer-legal {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding-block: 1.4rem 2rem;
  border-top: 1px solid var(--hairline);
  color: var(--text-3);
  font-size: .82rem;
}
.footer-ck .footer-legal a { color: var(--text-3); }
.footer-ck .footer-legal a:hover { color: var(--accent-strong); }
@media (max-width: 720px) {
  .footer-ck .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* --------------------------------------------------------------------------
   18 · Startseite
   -------------------------------------------------------------------------- */
.landing-page { overflow: hidden; }
.home-page > .footer-ck { margin-top: 0; }

.landing-hero {
  position: relative;
  padding: clamp(4.5rem, 9vw, 7.5rem) 0 clamp(4.75rem, 9vw, 7rem);
  background:
    radial-gradient(42% 70% at 86% 44%, color-mix(in srgb, var(--sp-cyan) 12%, transparent), transparent 72%),
    radial-gradient(35% 60% at 96% 12%, color-mix(in srgb, var(--sp-green) 8%, transparent), transparent 74%),
    radial-gradient(35% 55% at 5% 90%, color-mix(in srgb, var(--sp-magenta) 5%, transparent), transparent 76%),
    var(--bg);
}
.landing-hero-grid {
  display: grid;
  grid-template-columns:
    calc(50% + 100px)
    calc(50% - 100px);
  align-items: center;
  gap: clamp(3.5rem, 6vw, 6.5rem);
  isolation: isolate;
}
.landing-hero-copy { position: relative; z-index: 3; min-width: 0; }
.landing-hero-title {
  max-width: 100%;
  margin: 0;
  font-size: clamp(2.7rem, 5.5vw, 4.65rem);
  font-weight: 720;
  letter-spacing: -.045em;
  line-height: 1.02;
}
.landing-hero-title #typingheader {
  display: block;
  min-height: 1.08em;
  white-space: nowrap;
  max-width: 100%;
  font-size: .74em;
  line-height: 1.08;
}
.landing-hero-lead { max-width: 710px; margin: 1.65rem 0 2rem; }
.landing-actions { display: flex; flex-wrap: wrap; gap: .8rem; }
.landing-facts {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem 1.2rem;
  list-style: none;
  margin: 1.7rem 0 0;
  padding: 0;
  color: var(--text-3);
  font-size: .82rem;
  font-weight: 550;
}
.landing-facts li { display: inline-flex; align-items: center; gap: .45rem; }
.landing-facts i { color: var(--accent); }

.landing-brand-visual {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: min(100%, 460px);
  aspect-ratio: 1;
  justify-self: left;
  min-width: 0;
  contain: paint;
}
.landing-inline-logo {
  position: relative;
  z-index: 2;
  width: 68%;
  aspect-ratio: 713.5 / 748.3;
}
.landing-inline-logo > img,
.landing-inline-logo .ck-logo {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  overflow: visible;
}
.landing-logo-aura {
  position: absolute;
  z-index: 1;
  width: 68%;
  aspect-ratio: 713.5 / 748.3;
  object-fit: contain;
  filter: blur(26px) saturate(1.15);
  opacity: .36;
  transform: scale(1.12);
  animation: auraBreathe 10s var(--ease) infinite;
}
.landing-inline-logo .ck-logo :is(polygon, path) {
  transform-box: fill-box;
  transform-origin: center;
  animation: facetGlow 10s linear infinite both;
  filter: drop-shadow(0 0 var(--gr) var(--gc)) brightness(calc(1 + .55 * var(--gi))) saturate(calc(1 + .6 * var(--gi)));
}

@property --gr { syntax: '<length>'; initial-value: 0px; inherits: true; }
@property --gi { syntax: '<number>'; initial-value: 0; inherits: true; }
@keyframes facetGlow {
  0% { --gr: 0px; --gi: 0; }
  4% { --gr: 2.3px; --gi: 1; }
  13% { --gr: 0px; --gi: 0; }
  100% { --gr: 0px; --gi: 0; }
}
@keyframes auraBreathe {
  0%, 100% { opacity: .30; transform: scale(1.10); }
  50% { opacity: .48; transform: scale(1.17); }
}

.landing-stats { position: relative; z-index: 2; padding: clamp(2.5rem, 4vw, 3.5rem) 0; }
.landing-stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem;}
.landing-stat-card {
  position: relative;
  min-width: 0;
  min-height: 255px;
  padding: 1.6rem;
  overflow: hidden;
  border: 1px solid var(--hairline);
  border-radius: calc(var(--radius-l) + 4px);
  background: var(--surface);
  box-shadow: var(--shadow-s);
  transition: transform var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease);
}
.landing-stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-m); }
.landing-stat-card:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 24%, transparent); outline-offset: 3px; }
.landing-stat-icon {
  display: grid;
  place-items: center;
  width: 2.55rem;
  height: 2.55rem;
  margin-bottom: 1.35rem;
  border-radius: 13px;
  background: var(--accent-tint);
  color: var(--accent);
}
.landing-stat-value { display: block; margin-bottom: .1rem; font-size: clamp(1.75rem, 2.6vw, 2.35rem); line-height: 1.05; letter-spacing: -.035em; }
.landing-stat-label { display: block; color: var(--text); font-size: .86rem; font-weight: 650; }
.landing-stat-card p { margin: .8rem 0 0; color: var(--text-2); font-size: .84rem; line-height: 1.55; }
.landing-stat-featured {
  border-color: color-mix(in srgb, var(--accent) 20%, var(--hairline));
  background:
    radial-gradient(90% 80% at 100% 0%, color-mix(in srgb, var(--sp-cyan) 10%, transparent), transparent 70%),
    var(--surface);
}
.landing-stat-featured .landing-stat-icon { background: color-mix(in srgb, var(--sp-yellow) 20%, white); color: var(--warn); }

.landing-capabilities { padding: clamp(4.5rem, 9vw, 7rem) 0; background: var(--bg-subtle); }
.landing-capabilities-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: center;
  gap: clamp(3rem, 6vw, 6rem);
}
.landing-capabilities-copy h2,
.landing-about-copy h2,
.landing-support-card h2 { margin-bottom: .7rem; }
.landing-hint { margin: 1.5rem 0 .8rem; color: var(--text-3); font-size: .84rem; font-weight: 600; }
.landing-topic-list { display: flex; flex-wrap: wrap; gap: .6rem; list-style: none; margin: 0; padding: 0; }
.landing-topic {
  appearance: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: .58rem .9rem;
  background: var(--surface);
  color: var(--text-2);
  font: inherit;
  font-size: .84rem;
  font-weight: 570;
  cursor: pointer;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast), transform var(--t-fast);
}
.landing-topic:hover { transform: translateY(-1px); border-color: var(--accent); color: var(--accent-strong); }
.landing-topic.is-active { border-color: transparent; background: var(--accent); color: var(--text-invert); box-shadow: 0 7px 18px rgba(0,113,194,.18); }
.landing-topic:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 25%, transparent); outline-offset: 2px; }
.landing-chat-card {
  min-width: 0;
  min-height: 500px;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--accent) 9%, var(--hairline));
  border-radius: calc(var(--radius-l) + 8px);
  background: var(--surface);
  box-shadow: 0 22px 65px rgba(29,29,31,.1);
}
.landing-chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.35rem;
  border-bottom: 1px solid var(--hairline);
  background: rgba(255,255,255,.86);
}
.landing-chat-identity { display: flex; align-items: center; gap: .7rem; }
.landing-chat-identity > div { display: grid; line-height: 1.2; }
.landing-chat-identity strong { font-size: .88rem; }
.landing-chat-identity span { color: var(--text-3); font-size: .72rem; }
.landing-chat-identity span i { display: inline-block; width: 6px; height: 6px; margin-right: .35rem; border-radius: 50%; background: var(--ok); }
.landing-chat-logo { display: grid; place-items: center; width: 2.25rem; height: 2.25rem; border-radius: 11px; background: var(--bg-subtle); }
.landing-chat-logo img { width: 68%; height: 68%; }
.landing-card-kicker { display: inline-flex; align-items: center; gap: .45rem; color: var(--accent); font-size: .72rem; font-weight: 650; letter-spacing: .045em; text-transform: uppercase; }
.landing-chat-context { padding: 1.2rem 1.6rem .35rem; }
.landing-chat-context span { color: var(--text-3); font-size: .7rem; font-weight: 650; letter-spacing: .08em; text-transform: uppercase; }
.landing-chat-context h4 { margin: .15rem 0 0; font-size: 1.15rem; }
.landing-chat-card .chat-ck {
  min-height: 350px;
  padding: 1.1rem 1.6rem 1.7rem;
  background:
    radial-gradient(70% 80% at 100% 100%, color-mix(in srgb, var(--sp-cyan) 5%, transparent), transparent 72%),
    linear-gradient(180deg, rgba(245,246,248,.25), rgba(255,255,255,.7));
}
.landing-chat-card .chat-msg { max-width: 78%; animation: landing-chat-in .35s var(--ease) both; }
.landing-chat-card .chat-msg .avatar { width: 2.2rem; height: 2.2rem; box-shadow: 0 2px 8px rgba(29,29,31,.07); }
.landing-chat-card .chat-msg.out .avatar { color: var(--accent); background: var(--accent-tint); font-size: .8rem; }
.landing-chat-card .chat-bubble { padding: .85rem 1.05rem; box-shadow: 0 3px 14px rgba(29,29,31,.055); }
.landing-chat-card .chat-msg.in .chat-bubble { background: rgba(255,255,255,.95); }
.landing-chat-card .chat-msg.out .chat-bubble { background: linear-gradient(135deg, #eaf5fc, #f2f9fd); border: 1px solid color-mix(in srgb, var(--accent) 12%, transparent); }
.landing-chat-card .btn-copy { margin-left: .55rem; padding: .15rem; border: 0; background: transparent; color: var(--text-3); cursor: pointer; }
.landing-chat-card .chat-attachment { display: inline-flex; align-items: center; gap: .65rem; font-weight: 600; }
.landing-chat-card .chat-attachment > i { color: var(--ok); font-size: 1.15rem; }

.landing-about { padding: clamp(5rem, 10vw, 8rem) 0; }
.landing-about-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(300px, .7fr); align-items: stretch; gap: clamp(2.5rem, 7vw, 5.5rem); }
.landing-about-copy { align-self: center; }
.landing-about-copy p { max-width: 66ch; color: var(--text-2); }
.landing-inline-link { display: inline-flex; align-items: center; gap: .55rem; margin-top: .5rem; font-weight: 620; }
.landing-inline-link i { font-size: .8em; transition: transform var(--t-fast); }
.landing-inline-link:hover i { transform: translateX(3px); }
.landing-support-card {
  position: relative;
  overflow: hidden;
  padding: clamp(1.8rem, 4vw, 2.7rem);
  border: 1px solid color-mix(in srgb, var(--accent) 12%, var(--hairline));
  border-radius: calc(var(--radius-l) + 6px);
  background:
    radial-gradient(100% 80% at 100% 0%, color-mix(in srgb, var(--sp-cyan) 10%, transparent), transparent 70%),
    var(--surface);
  box-shadow: var(--shadow-s);
}
.landing-support-card p { color: var(--text-2); margin-bottom: 1.5rem; }
.landing-support-card .eyebrow { margin-bottom: .55rem; }
.landing-support-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 1.5rem;
  border-radius: 15px;
  background: var(--accent-tint);
  color: var(--accent);
  font-size: 1.2rem;
}

@keyframes landing-chat-in { from { opacity: 0; transform: translateY(8px) scale(.985); } to { opacity: 1; transform: none; } }

@media (max-width: 1180px) {
  .landing-hero { padding-top: 4.25rem; }
  .landing-hero-grid { grid-template-columns: 1fr; text-align: center; }
  .landing-hero-title, .landing-hero-lead { margin-left: auto; margin-right: auto; }
  .landing-actions, .landing-facts { justify-content: center; }
  .landing-brand-visual { width: min(76vw, 470px); height: min(76vw, 500px); }
  .landing-capabilities-grid, .landing-about-grid { grid-template-columns: 1fr; }
  .landing-capabilities-copy { max-width: 680px; }
}

@media (max-width: 1100px) {
  .landing-stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 520px) {
  .landing-hero { padding: 3.8rem 0 4.5rem; }
  .landing-hero-title { max-width: none; font-size: 2.45rem; }
  .landing-hero-title #typingheader { font-size: clamp(1.6rem, 8vw, 2.15rem); }
  .landing-hero-lead { margin-top: 1.25rem; font-size: 1.08rem; }
  .landing-actions { align-items: stretch; flex-direction: column; }
  .landing-actions .btn { width: 100%; }
  .landing-facts { gap: .5rem 1rem; }
  .landing-brand-visual { width: min(92vw, 350px); height: min(92vw, 380px); }
  .landing-stats-grid { grid-template-columns: 1fr; }
  .landing-stat-card { min-height: 0; }
  .landing-capabilities, .landing-about { padding-block: 4.5rem; }
  .landing-topic { width: 100%; text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  .landing-chat-card .chat-msg { animation: none; }
  .landing-inline-logo .ck-logo :is(polygon, path), .landing-logo-aura { animation: none; }
}

/* --------------------------------------------------------------------------
   15 · Scroll-Reveal (mit kleinem JS: IntersectionObserver setzt .in-view)
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
.reveal.in-view { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .1s; }
.reveal[data-delay="2"] { transition-delay: .2s; }
.reveal[data-delay="3"] { transition-delay: .3s; }

/* --------------------------------------------------------------------------
   16 · Reduzierte Bewegung
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .text-spectrum,
  .link-funkeln:hover,
  .sparkle:hover::before,
  .sparkle:hover::after { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}

/* ========================================================================== 
   17 · Anwendung & Legacy-Kompatibilität
   Überträgt das Designsystem auf die vorhandenen Bootstrap-Seiten, ohne
   deren Grid-, Modal- oder JavaScript-Funktionalität zu verändern.
   ========================================================================== */
body { min-height: 100vh; display: flex; flex-direction: column; }
body > .footer-ck { margin-top: auto; width: 100%; }
body > h1, body > h2, body > h3, body > .box, body > form, body > table {
  width: min(1480px, calc(100% - 2rem)); margin-left: auto; margin-right: auto;
}
body > h1:first-child, body > h2:first-child, body > h3:first-child { margin-top: clamp(2rem, 6vw, 5rem); }
body > table { margin-bottom: 3rem; }
body > .box {
  margin-top: clamp(1rem, 5vw, 4rem); margin-bottom: 3rem; padding: clamp(1.25rem, 4vw, 2.5rem);
  background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius-l);
  box-shadow: var(--shadow-s);
}
main, body > section, body > .container, body > .container-fluid:not(.hero-header) { position: relative; }

.container, .container-sm, .container-md, .container-lg, .container-xl, .container-xxl {
  max-width: 1080px;
}
.container-fluid > .container { padding-left: clamp(1rem, 3vw, 2rem); padding-right: clamp(1rem, 3vw, 2rem); }
.py-5 { padding-top: clamp(2.5rem, 6vw, 5rem) !important; padding-bottom: clamp(2.5rem, 6vw, 5rem) !important; }
.bg-light { background-color: var(--bg-subtle) !important; }
.bg-white { background-color: var(--surface) !important; }
.text-primary { color: var(--accent) !important; }
.text-dark { color: var(--text) !important; }
.border, .border-top, .border-bottom { border-color: var(--hairline) !important; }

/* Navigation */
.nav-ck { flex: 0 0 auto; }
.nav-auth {
  height: 42px;
  padding: 0 1.35em;
  font-size: .84rem;
  font-weight: 600;
  color: #fff !important;
}
.dd-menu-wide { min-width: 275px; }
.nav-toggle {
  display: none; width: 42px; height: 42px; margin-left: auto; padding: 10px;
  border: 1px solid var(--hairline); border-radius: var(--radius-s);
  background: var(--surface); cursor: pointer;
}
.nav-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--text); border-radius: 2px; transition: transform var(--t-fast), opacity var(--t-fast); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Seitenkopf und Startseite */
.hero-header {
  position: relative; isolation: isolate; min-height: min(680px, calc(100vh - 60px));
  display: grid; align-items: center; margin-bottom: 0 !important;
  background-position: center !important;
}
.hero-header::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(90deg, rgba(8,19,35,.9) 0%, rgba(8,19,35,.7) 48%, rgba(8,19,35,.28) 100%);
}
.hero-header h1, .hero-header h2, .hero-header p { color: #fff !important; }
.hero-header .display-4 { font-size: clamp(2.5rem, 5vw, 4.3rem); letter-spacing: -.035em; }
.hero-header .dark-mode, .hero-header [style*="rgba(0,0,0"] {
  background: rgba(255,255,255,.1) !important; border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--radius-l); backdrop-filter: blur(18px); box-shadow: var(--shadow-l);
}

/* Karten */
.card, .form-holder, .modal-content, .accordion-item, .list-group {
  background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius-l);
  box-shadow: none;
}
.card { overflow: hidden; }
.card-header, .card-footer { background: var(--bg-subtle); border-color: var(--hairline); }
.shadow, .shadow-sm, .has-shadow { box-shadow: var(--shadow-m) !important; }
.rounded, .rounded-3 { border-radius: var(--radius-m) !important; }

/* Buttons */
.btn { box-shadow: none !important; }
.btn-primary, .btn-info { background: var(--accent) !important; border-color: var(--accent) !important; color: #fff !important; }
.btn-primary:hover, .btn-info:hover { background: var(--accent-strong) !important; border-color: var(--accent-strong) !important; }
.btn-secondary, .btn-light { background: var(--surface) !important; color: var(--text) !important; border-color: var(--border) !important; }
.btn-success { background: var(--ok) !important; border-color: var(--ok) !important; color: #fff !important; }
.btn-warning { background: var(--warn-bg) !important; color: var(--warn) !important; border-color: color-mix(in srgb, var(--warn) 25%, transparent) !important; }
.btn-danger { background: var(--surface) !important; color: var(--danger) !important; border-color: color-mix(in srgb, var(--danger) 35%, transparent) !important; }
.btn-danger:hover { background: var(--danger-bg) !important; border-color: var(--danger) !important; }
.btn-square, .btn-sm-square, .btn-lg-square { padding: 0; border-radius: 50% !important; }
/* .tile-choice: große Auswahlkacheln, die zwar Schaltflächen sind, aber wie
   Karten aussehen sollen (z. B. im Wizard „Test anlegen"). Sie bringen ihr
   eigenes Aussehen mit und werden hier deshalb ausgenommen. */
/* .nav-btn: Schaltflächen der Hauptnavigation (Aufklapp-Trigger, Pfeilknopf
   der Codeeingabe). Sie sind zwar <button>, sollen aber wie Navigationslinks
   aussehen. Ohne diese Ausnahme sticht die Regel hier die Navigationsregeln
   aus Abschnitt 5 aus und verpasst ihnen Rahmen, weiße Fläche und 42px
   Mindesthöhe – genau der optische Bruch, den die Leiste vorher hatte. */
button:not(.btn):not(.nav-toggle):not(.nav-btn):not(.modal-close):not(.btn-close):not(.btn-copy):not(.tile-choice), input[type="submit"] {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  min-height: 42px; padding: .72em 1.5em; border: 1px solid var(--border);
  border-radius: var(--radius-pill); background: var(--surface); color: var(--text);
  font: inherit; font-size: .95rem; font-weight: 550; line-height: 1; cursor: pointer;
}
button[type="submit"]:not(.btn):not(.nav-btn), input[type="submit"] { background: var(--accent); border-color: var(--accent); color: #fff; }
button[type="submit"]:not(.btn):not(.nav-btn):hover, input[type="submit"]:hover { background: var(--accent-strong); }

/* Formulare */
.form-label, form label { color: var(--text); font-size: .875rem; font-weight: 550; }
.form-control, .form-select, .input-material, input[type="text"], input[type="email"], input[type="password"], input[type="number"], input[type="date"], input[type="datetime-local"], input[type="file"], textarea, select {
  font-family: var(--font-sans); color: var(--text); background-color: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-s); padding: .65em .9em;
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.form-control:focus, .form-select:focus, .input-material:focus, input:focus, textarea:focus, select:focus {
  color: var(--text); background: var(--surface); border-color: var(--accent);
  box-shadow: 0 0 0 3.5px color-mix(in srgb, var(--accent) 18%, transparent); outline: 0;
}
.form-check-input:checked { background-color: var(--accent); border-color: var(--accent); }
.input-group-text { background: var(--bg-subtle); border-color: var(--border); color: var(--text-2); }

/* Tabellen */
.table-responsive { border: 1px solid var(--hairline); border-radius: var(--radius-m); overflow: auto; background: var(--surface); }
.table { margin-bottom: 0; color: var(--text); font-size: .92rem; border-color: var(--hairline); }
.table > :not(caption) > * > * { padding: .85rem 1.1rem; border-bottom-color: var(--hairline); box-shadow: none; }
.table thead th, .table > thead {
  font-size: .76rem; font-weight: 650; letter-spacing: .055em; text-transform: uppercase;
  color: var(--text-3); background: var(--bg-subtle); white-space: nowrap;
}
.table-striped > tbody > tr:nth-of-type(odd) > * { background: var(--bg-subtle); color: var(--text); }
.table-hover > tbody > tr:hover > *, .table tbody tr:hover > * { background: var(--accent-tint); color: var(--text); }
.table-bordered > :not(caption) > * { border-color: var(--hairline); }

/* Meldungen, Tabs, Pagination */
.alert { border: 0; border-radius: var(--radius-m); }
.alert-info, .alert-primary { color: var(--accent-strong); background: var(--accent-tint); }
.alert-success { color: var(--ok); background: var(--ok-bg); }
.alert-warning { color: var(--warn); background: var(--warn-bg); }
.alert-danger { color: var(--danger); background: var(--danger-bg); }
.nav-tabs { border-bottom-color: var(--hairline); gap: .25rem; }
.nav-tabs .nav-link { border: 0; border-radius: var(--radius-pill); color: var(--text-2); }
.nav-tabs .nav-link:hover { background: var(--bg-subtle); color: var(--text); }
.nav-tabs .nav-link.active { color: var(--accent-strong); background: var(--accent-tint); }
.page-link { color: var(--accent); border-color: var(--hairline); }
.page-item.active .page-link { background: var(--accent); border-color: var(--accent); }

/* Bootstrap modal in Chemie.KI styling */
.modal-content { overflow: hidden; box-shadow: var(--shadow-l); }
.modal-header, .modal-footer { border-color: var(--hairline); padding: 1.25rem 1.5rem; }
.modal-body { padding: 1.5rem; }
.modal-backdrop.show { opacity: .35; }
.btn-close { background-color: var(--bg-subtle); border-radius: 50%; padding: .75rem; }

/* Chat: helle Variante */
.chat-container { color: var(--text); }
.chat-container .chat-content { max-width: 100%; }
.chat-container .incoming .chat-details, .chat-container .outgoing .chat-details {
  padding: .75rem 1rem; border-radius: var(--radius-m); color: var(--text);
}
.chat-container .incoming .chat-details { background: var(--surface); border: 1px solid var(--hairline); }
.chat-container .outgoing .chat-details { background: var(--accent-tint); }
.chat-container .chat p, .chat-container .chat h1, .chat-container .chat h2 { color: var(--text) !important; }

/* Zwischen dem Klappmenü und der vollen Breite wird es eng: ein Konto mit
   allen Rollen bringt fünf Punkte auf die Schiene, dazu Codeeingabe und
   Anmelden. Hier rücken die Zonen enger zusammen, statt überzulaufen. */
@media (min-width: 992px) and (max-width: 1200px) {
  .nav-ck { gap: 1rem; }
  .nav-group > a, .nav-item-dd > button { padding: 0 .6em; font-size: .88rem; }
  .nav-code { padding-left: .75rem; }
  .nav-code input[type="text"] { width: 5.4em; }
  .nav-auth { padding: 0 1em; }
}

@media (max-width: 991.98px) {
  .nav-ck { height: 60px; padding-inline: 1rem; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: calc(100% + 1px); left: 0; right: 0;
    max-height: calc(100vh - 61px); overflow-y: auto; margin: 0; padding: .75rem 1rem 1rem;
    flex-direction: column; align-items: stretch; gap: .25rem; background: rgba(255,255,255,.97);
    border-bottom: 1px solid var(--hairline); box-shadow: var(--shadow-m); backdrop-filter: blur(20px);
  }
  .nav-links.is-open { display: flex; }
  /* Im Klappmenü löst sich die Schiene auf: die Seitenlinks stehen dann
     untereinander wie eine Liste, Codeeingabe und Anmelden darunter. */
  .nav-group {
    flex-direction: column; align-items: stretch;
    height: auto; padding: 0; gap: .25rem;
    background: none; border: 0; border-radius: 0;
  }
  .nav-item-dd { display: block; }
  /* :not(.nav-auth) – der Anmelden-Button ist ebenfalls ein direktes <a> der
     Leiste, soll aber Button bleiben und nicht zum Listeneintrag werden. */
  .nav-links > a:not(.nav-auth), .nav-links > button, .nav-group > a, .nav-item-dd > button {
    width: 100%; height: auto; padding: .7rem .9rem; text-align: left; justify-content: flex-start;
  }
  .nav-group > a.active { background: var(--accent-tint); color: var(--accent-strong); box-shadow: none; }
  .nav-item-dd .dd-menu { position: static; display: none; min-width: 0; margin: .25rem 0 .5rem; opacity: 1; visibility: visible; transform: none; box-shadow: none; }
  .nav-item-dd:focus-within .dd-menu, .nav-item-dd:hover .dd-menu { display: block; }
  .nav-code { width: 100%; height: 46px; margin-top: .5rem; padding-left: 1.1rem; }
  .nav-code input[type="text"] { flex: 1 1 auto; width: auto; }
  .nav-code-go { width: 36px; height: 36px; }
  .nav-auth { width: 100%; height: 46px; margin: .5rem 0 0; text-align: center !important; }
  .hero-header { min-height: auto; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .footer-ck .footer-grid { grid-template-columns: 1fr; gap: 2rem; padding-top: 2.5rem; }
  .table > :not(caption) > * > * { padding: .65rem .75rem; }
  .hero-header::before { background: rgba(8,19,35,.78); }
}