/* ================================================================
   FensterLex — styles.css
   Hauptseite (index.html)
   Ästhetik: Technisch-Editorial · Dunkel · Amber-Gold
   ================================================================

   INHALTSVERZEICHNIS
   ──────────────────
   01  Fonts & Import
   02  CSS-Variablen (Design Tokens)
   03  Reset & Basis
   04  Scrollbar & Textauswahl
   05  Navigation (Header, Logo, Links, Hamburger)
   06  Hero (Layout, Titel, Untertitel, Stats)
   07  Hero – Fotocollage (hph-*)
   08  Hero – Fenster-Illustration (win-*)
   09  Kategorie-Fotostreifen (cat-photo-strip)
   10  Suche
   11  Filter-Tabs
   12  A–Z Register
   13  Lexikon-Grid & Karten
       13a  Grid-Layout
       13b  Karte Basis (.lex-card)
       13c  Karte mit Bild (.has-img)
       13d  Karten-Inhalt (Badge, Titel, Def, Values, Formel, Tabelle)
       13e  Kategorie-Akzentfarben
       13f  Karten-Animation
       13g  „Mehr"-Button & No-Results
   14  Glossar / Schnellreferenz (qr-grid)
   15  U-Wert Rechner
   16  Modal
   17  Footer
   18  Responsive
       18a  ≤ 900 px (Tablet)
       18b  ≤ 600 px (Mobil groß)
       18c  ≤ 480 px (Mobil klein)
   19  Sonstiges (.amp, footer-logo Link)

   ================================================================ */


/* ================================================================
   01  FONTS & IMPORT
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&family=DM+Mono:wght@300;400;500&family=Crimson+Pro:ital,wght@0,300;0,400;1,300&display=swap');


/* ================================================================
   02  CSS-VARIABLEN (Design Tokens)
   ================================================================ */

:root {

  /* Hintergrundabstufungen */
  --bg:           #0d0f11;   /* tiefstes Dunkel */
  --bg2:          #141618;   /* Kartenebene */
  --bg3:          #1a1d20;   /* leicht erhöht (Inputs, Code-Boxen) */

  /* Rahmen */
  --border:       #2a2e33;
  --border-light: #363b41;   /* Hover-Zustand */

  /* Akzentfarbe: Bernstein/Gold */
  --amber:        #c8963b;
  --amber-light:  #e6b465;
  --amber-dim:    rgba(200, 150, 59, 0.12);

  /* Textfarben */
  --text:         #e4e2dc;
  --text-dim:     #8a8880;
  --text-muted:   #555a60;

  /* Statusfarben */
  --good:         #4caf6e;
  --ok:           #d4a843;
  --bad:          #e05454;
  --excellent:    #4fa8d4;
  --norm-color:   #9b7fd4;

  /* Kategoriefarben */
  --cat-fenster:      #c8963b;
  --cat-tueren:       #5a9e7a;
  --cat-sonnenschutz: #e09050;
  --cat-materialien:  #5a90c8;
  --cat-normen:       #9b7fd4;

  /* Schriftarten */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'Crimson Pro', Georgia, serif;
  --font-mono:    'DM Mono', 'Fira Code', monospace;

  /* Abstände & Effekte */
  --radius:       4px;
  --radius-lg:    8px;
  --shadow:       0 4px 24px rgba(0,0,0,0.4);
}


/* ================================================================
   03  RESET & BASIS
   ================================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

a { color: inherit; text-decoration: none; }
a:hover { color: inherit; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  overflow-x: hidden;
}

/* Dezentes Gitternetz im Hintergrund */
.grid-overlay {
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.014) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.014) 1px, transparent 1px);
  background-size: 60px 60px;
}


/* ================================================================
   04  SCROLLBAR & TEXTAUSWAHL
   ================================================================ */

::-webkit-scrollbar              { width: 6px; height: 6px; }
::-webkit-scrollbar-track        { background: var(--bg); }
::-webkit-scrollbar-thumb        { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover  { background: var(--amber); }

::selection { background: rgba(200,150,59,0.25); color: var(--text); }


/* ================================================================
   05  NAVIGATION
   ================================================================ */

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13,15,17,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 0 2rem;
  display: flex; align-items: center; gap: 2rem;
  height: 64px;
}

/* Logo */
.logo {
  display: flex; align-items: center; gap: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: -0.01em;
  flex-shrink: 0;
}
.logo em { font-style: italic; color: var(--amber-light); }

/* ── Fenster-Icon (CSS only) ── */
.logo-window {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 22px;
  border: 2px solid var(--amber);
  border-radius: 2px;
  flex-shrink: 0;
  margin-right: 9px;
  transform: skewX(-12deg);
  transition: opacity 0.2s;
}
.logo-window::before {
  content: '';
  position: absolute;
  top: 50%; left: 0; right: 0;
  height: 2px;
  background: var(--amber);
  transform: translateY(-50%);
}
.logo-window::after {
  content: '';
  position: absolute;
  left: 50%; top: 0; bottom: 0;
  width: 2px;
  background: var(--amber);
  transform: translateX(-50%);
}
.logo:hover .logo-window { opacity: 0.8; }

/* Nav-Links */
.main-nav {
  display: flex; gap: 0.25rem; margin-left: auto;
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius);
  transition: color 0.2s, background 0.2s;
}
.nav-link:hover,
.nav-link.active { color: var(--amber-light); background: var(--amber-dim); }

/* „Bald"-Platzhalter */
.nav-soon {
  display: flex; align-items: center; gap: 4px;
  opacity: 0.35; cursor: default;
  font-family: var(--font-mono); font-size: 0.72rem;
  letter-spacing: 0.06em; color: var(--text-dim);
  text-transform: uppercase;
  padding: 0.35rem 0.85rem;
}
.nav-soon em {
  font-style: normal; font-size: 9px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--text-muted); padding: 1px 5px;
  border-radius: 2px; letter-spacing: 0.06em;
}

/* Hamburger-Button (mobil) */
.hamburger {
  display: none;
  flex-direction: column; justify-content: center; gap: 5px;
  background: none; border: none; cursor: pointer;
  padding: 8px; margin-left: auto;
}
.hamburger span {
  display: block; width: 22px; height: 1.5px;
  background: var(--text);
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }


/* ================================================================
   06  HERO – LAYOUT, TITEL, UNTERTITEL, STATS
   ================================================================ */

.hero {
  position: relative;
  min-height: 90vh;
  display: flex; align-items: center;
  overflow: hidden;
  padding: 5rem 2rem 4rem;
}

/* Großer Hintergrundtext „LEXIKON" */
.hero-bg-text {
  position: absolute;          /* bleibt absolut — kein Flex-Item! */
  right: -2%;
  top: 50%; transform: translateY(-50%);
  z-index: 2;
  font-family: var(--font-display);
  font-size: clamp(120px, 18vw, 260px);
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px rgba(200,150,59,0.08);
  letter-spacing: -0.04em;
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

/* Content-Block (Text + Stats) */
.hero-content {
  position: relative; z-index: 2;
  width: 100%;
  max-width: 680px;
  margin: 0 auto 0 0;
}

/* Oberes Label */
.hero-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 1.5rem;
  display: flex; align-items: center; gap: 0.75rem;
}
.hero-label::before {
  content: '';
  display: block; width: 28px; height: 1px;
  background: var(--amber);
}

/* Haupttitel mit Einblend-Animation */
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 1.75rem;
}
.hero-title .line        { display: block; opacity: 0; transform: translateY(30px); }
.hero-title .italic      { font-style: italic; color: var(--amber-light); }
.hero-title .line.visible { animation: slide-up 0.8s cubic-bezier(.16,1,.3,1) forwards; }
.hero-title .line:nth-child(2) { animation-delay: 0.12s; }
.hero-title .line:nth-child(3) { animation-delay: 0.24s; }

@keyframes slide-up { to { opacity: 1; transform: translateY(0); } }

/* Untertitel */
.hero-sub {
  font-size: 1.15rem;
  font-weight: 300;
  color: var(--text-dim);
  max-width: 520px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

/* Statistik-Zeile */
.hero-stats {
  display: flex; align-items: center; gap: 0;
  opacity: 0;
  animation: fade-in 1s 0.6s ease forwards;
}
@keyframes fade-in { to { opacity: 1; } }

.stat {
  display: flex; flex-direction: column; gap: 0.2rem;
  padding: 0 2rem 0 0;
}
.stat-num {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 0.67rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.stat-divider {
  width: 1px; height: 44px;
  background: var(--border);
  margin: 0 2rem 0 0;
}


/* ================================================================
   07  HERO – FOTOCOLLAGE
   ================================================================ */

.hero-photos {
  position: absolute; inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hph { position: absolute; overflow: hidden; }
.hph img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(0.4) brightness(0.35);
  transition: transform 6s ease;
  transform: scale(1.05);
}
.hero:hover .hph img { transform: scale(1.0); }

.hph-1 {
  right: 0; top: 0; bottom: 0; width: 42%;
  clip-path: polygon(10% 0, 100% 0, 100% 100%, 0% 100%);
}
.hph-2 {
  right: 26%; top: 0; width: 22%; height: 55%;
  clip-path: polygon(0 0, 100% 0, 90% 100%, 0% 100%);
  opacity: 0.6;
}
.hph-3 {
  right: 36%; bottom: 0; width: 18%; height: 50%;
  opacity: 0.4;
}

/* Verlauf, der Hero-Content sauber freiStellt */
.hero-photos-veil {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(
    105deg,
    var(--bg) 30%,
    rgba(13,15,17,0.92) 55%,
    rgba(13,15,17,0.5) 75%,
    rgba(13,15,17,0.1) 100%
  );
}

/* Content-Elemente über dem Veil */
.hero-content, .hero-window { position: relative; z-index: 2; }


/* ================================================================
   08  HERO – FENSTER-ILLUSTRATION
   ================================================================ */

.hero-window {
  position: absolute;
  right: 19%;
  top: 50%; transform: translateY(-50%);
  width: min(300px, 32vw);
  aspect-ratio: 0.75;
  opacity: 0;
  animation: fade-in 1.4s 0.4s ease forwards;
}

.win-frame {
  width: 100%; height: 100%;
  border: 2px solid rgba(200,150,59,0.3);
  position: relative;
  border-radius: 2px;
  box-shadow: inset 0 0 60px rgba(200,150,59,0.04),
                    0 0 80px rgba(200,150,59,0.06);
}
.win-cross-h {
  position: absolute;
  left: 0; right: 0; top: 50%; transform: translateY(-50%);
  height: 2px; background: rgba(200,150,59,0.3);
}
.win-cross-v {
  position: absolute;
  top: 0; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 2px; background: rgba(200,150,59,0.3);
}
.win-pane {
  position: absolute;
  width: calc(50% - 5px); height: calc(50% - 2px);
  background: linear-gradient(135deg,
    rgba(200,150,59,0.03) 0%,
    rgba(79,168,212,0.03) 100%);
  backdrop-filter: blur(1px);
}
.win-pane.tl { top: 0; left: 0; }
.win-pane.tr { top: 0; right: 0; }
.win-pane.bl { bottom: 0; left: 0; }
.win-pane.br { bottom: 0; right: 0; }


/* ================================================================
   09  KATEGORIE-FOTOSTREIFEN
   ================================================================ */

.cat-photo-strip {
  display: flex;
  height: 220px;
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.cps-item {
  flex: 1;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  display: block;
}
.cps-item + .cps-item { border-left: 1px solid var(--border); }

.cps-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(0.3) brightness(0.45);
  transition: transform 0.55s cubic-bezier(.25,.8,.25,1), filter 0.55s ease;
  transform: scale(1.06);
}
.cps-item:hover img {
  transform: scale(1.0);
  filter: saturate(0.6) brightness(0.55);
}

.cps-overlay {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 0.4rem;
  background: linear-gradient(to top, rgba(13,15,17,0.7) 0%, transparent 60%);
  padding: 1.25rem;
  transition: background 0.3s;
}
.cps-item:hover .cps-overlay {
  background: linear-gradient(to top, rgba(13,15,17,0.85) 0%, rgba(13,15,17,0.1) 60%);
}

.cps-overlay svg {
  width: 28px; height: 28px;
  stroke: rgba(255,255,255,0.5);
  margin-bottom: 0.2rem;
  transition: stroke 0.3s, transform 0.3s;
}
.cps-item:hover .cps-overlay svg {
  stroke: var(--amber-light);
  transform: scale(1.15);
}

.cps-label {
  font-family: var(--font-display);
  font-size: 1.05rem; font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em; text-align: center;
}

.cps-count {
  font-family: var(--font-mono);
  font-size: 0.62rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--amber);
  opacity: 0; transform: translateY(6px);
  transition: opacity 0.3s 0.05s, transform 0.3s;
}
.cps-item:hover .cps-count { opacity: 1; transform: translateY(0); }

/* Kategorie-Akzent-Streifen unten */
.cps-item[data-category="fenster"]      .cps-overlay { border-bottom: 2px solid transparent; }
.cps-item[data-category="fenster"]:hover .cps-overlay { border-bottom-color: var(--cat-fenster); }
.cps-item[data-category="tueren"]:hover .cps-overlay  { border-bottom: 2px solid var(--cat-tueren); }
.cps-item[data-category="sonnenschutz"]:hover .cps-overlay { border-bottom: 2px solid var(--cat-sonnenschutz); }
.cps-item[data-category="materialien"]:hover .cps-overlay  { border-bottom: 2px solid var(--cat-materialien); }
.cps-item[data-category="normen"]:hover .cps-overlay  { border-bottom: 2px solid var(--cat-normen); }


/* ================================================================
   10  SUCHE
   ================================================================ */

.search-section {
  padding: 0 2rem;
  position: relative; z-index: 10;
}

.search-wrap {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center;
  background: var(--bg2);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-wrap:focus-within {
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(200,150,59,0.12);
}

.search-icon {
  width: 20px; height: 20px;
  stroke: var(--text-muted);
  margin-left: 1.25rem;
  flex-shrink: 0;
}

.search-input {
  flex: 1;
  background: none; border: none; outline: none;
  font-family: var(--font-body);
  font-size: 1.05rem;
  color: var(--text);
  padding: 1rem 1.25rem;
}
.search-input::placeholder { color: var(--text-muted); }

.search-shortcut {
  font-family: var(--font-mono);
  font-size: 0.65rem; letter-spacing: 0.05em;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2px 6px;
  margin-right: 1.25rem;
}


/* ================================================================
   11  FILTER-TABS
   ================================================================ */

.filter-section {
  padding: 1.25rem 2rem;
  position: relative; z-index: 5;
}

.filter-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  display: flex; align-items: center; gap: 0.5rem;
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem; letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.45rem 1rem;
  border-radius: 100px;
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn svg { width: 14px; height: 14px; }
.filter-btn:hover { border-color: var(--amber); color: var(--amber); }
.filter-btn.active {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--bg);
}
.filter-btn.active svg { stroke: var(--bg); }


/* ================================================================
   12  A–Z REGISTER
   ================================================================ */

.az-section {
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  padding: 0.6rem 2rem;
}
.az-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 1rem;
  flex-wrap: wrap;
}
.az-heading {
  font-family: var(--font-mono);
  font-size: 0.65rem; letter-spacing: 0.12em;
  color: var(--text-muted); text-transform: uppercase;
  flex-shrink: 0;
}
.az-letters { display: flex; gap: 0.2rem; flex-wrap: wrap; }

.az-btn {
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--text-muted);
  background: none; border: none;
  padding: 0.25rem 0.45rem; border-radius: 3px;
  cursor: pointer; line-height: 1;
  transition: color 0.15s, background 0.15s;
}
.az-btn:hover  { color: var(--amber); background: var(--amber-dim); }
.az-btn.active { color: var(--bg);    background: var(--amber); }
.az-btn.empty  { color: var(--border-light); cursor: default; pointer-events: none; }


/* ================================================================
   13a  LEXIKON – GRID-LAYOUT
   ================================================================ */

.lexikon-section {
  padding: 2rem 2rem 4rem;
}

.lexikon-grid {
  max-width: 1280px; margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}


/* ================================================================
   13b  KARTE – BASIS (.lex-card)
   ================================================================ */

.lex-card {
  background: var(--bg2);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.25s, box-shadow 0.25s;
}

/* Akzent-Streifen oben (erscheint beim Hover) */
.lex-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg,
    transparent, var(--card-accent, var(--amber)), transparent);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 11;
}
.lex-card:hover::before { opacity: 1; }

/* Rahmen als ::after — liegt ÜBER dem Bild, wird nie geclipt */
.lex-card::after {
  content: '';
  position: absolute; inset: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  pointer-events: none;
  z-index: 10;
  transition: border-color 0.25s, box-shadow 0.25s;
}
.lex-card:hover::after {
  border-color: var(--border-light);
  box-shadow: var(--shadow);
}

/* Hover: Karte hebt sich */
.lex-card:hover { transform: translateY(-5px); }

/* Layout-Varianten */
.lex-card.wide { grid-column: span 2; }
.lex-card.hide { display: none; }


/* ================================================================
   13c  KARTE MIT BILD (.has-img)
   ================================================================ */

.lex-card.has-img {
  padding: 0;         /* Bild geht bis zum Rand */
}

.lex-card.has-img .card-img {
  width: 100%;
  height: 180px;
  overflow: hidden;
  position: relative;
}

.lex-card.has-img .card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.3) brightness(0.5);
  transform: scale(1.04);
  transition: transform 0.5s ease, filter 0.5s ease;
}

/* Bild zoomt rein beim Hover — ::after-Rahmen bleibt darüber sichtbar */
.lex-card.has-img:hover .card-img img {
  transform: scale(1.1);
  filter: saturate(0.5) brightness(0.6);
}

/* Verlauf am unteren Bildrand (Übergang zu Text) */
.lex-card.has-img .card-img::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0; height: 80%;
  background: linear-gradient(to top, var(--bg2), transparent);
  pointer-events: none;
}

/* Innenabstand für alle Kind-Elemente außer dem Bild */
.lex-card.has-img > *:not(.card-img) { padding: 0 1.6rem; }
.lex-card.has-img .card-cat-badge    { margin-top: 1.25rem; }
.lex-card.has-img .card-values,
.lex-card.has-img .card-formula,
.lex-card.has-img .card-table-wrap   { margin-bottom: 1.6rem; }

/* Wide-Karte mit Bild: etwas höheres Bild */
.lex-card.wide.has-img .card-img { height: 200px; }


/* ================================================================
   13d  KARTEN-INHALT (Badge, Titel, Def, Values, Formel, Tabelle)
   ================================================================ */

/* Kategorie-Badge */
.card-cat-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.62rem; letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem; border-radius: 2px;
  margin-bottom: 0.75rem; font-weight: 500;
}
.card-cat-badge.fenster      { background: rgba(200,150,59,0.12); color: var(--cat-fenster); }
.card-cat-badge.tueren       { background: rgba(90,158,122,0.12); color: var(--cat-tueren); }
.card-cat-badge.sonnenschutz { background: rgba(224,144,80,0.12); color: var(--cat-sonnenschutz); }
.card-cat-badge.materialien  { background: rgba(90,144,200,0.12); color: var(--cat-materialien); }
.card-cat-badge.normen       { background: rgba(155,127,212,0.12); color: var(--cat-normen); }

/* Karten-Titel */
.card-title {
  font-family: var(--font-display);
  font-size: 1.5rem; font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 0.6rem; line-height: 1.2;
}
.card-title sub {
  font-size: 0.7em;
  vertical-align: sub;
  font-family: var(--font-mono);
}

/* Kurzdefinition */
.card-def {
  font-size: 0.97rem;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

/* Kennwert-Tabelle */
.card-values {
  display: flex; flex-direction: column; gap: 0.4rem;
  background: var(--bg3);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
}
.value-row {
  display: flex; justify-content: space-between;
  align-items: baseline; gap: 1rem;
}
.vr-label {
  font-family: var(--font-mono);
  font-size: 0.67rem; letter-spacing: 0.04em;
  color: var(--text-muted); flex-shrink: 0;
}
.vr-val {
  font-family: var(--font-body);
  font-size: 0.9rem; color: var(--text-dim);
  text-align: right;
}
.vr-val.mono      { font-family: var(--font-mono); font-size: 0.78rem; }
.vr-val.excellent { color: var(--excellent); }
.vr-val.good      { color: var(--good); }
.vr-val.ok        { color: var(--ok); }
.vr-val.bad       { color: var(--bad); }
.vr-val.norm      { color: var(--norm-color); }

/* Formel-Anzeige */
.card-formula {
  margin-top: 0.85rem;
  font-family: var(--font-mono); font-size: 0.77rem;
  color: var(--amber-light);
  background: rgba(200,150,59,0.06);
  border: 1px solid rgba(200,150,59,0.18);
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius);
  letter-spacing: 0.02em;
}

/* Vergleichstabelle in Karte */
.card-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.card-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.87rem;
}
.card-table thead tr { background: var(--bg3); }
.card-table th {
  font-family: var(--font-mono);
  font-size: 0.65rem; letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--text-muted);
  padding: 0.6rem 0.9rem; text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.card-table td {
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-dim); vertical-align: middle;
}
.card-table tbody tr:last-child td { border-bottom: none; }
.card-table tbody tr:hover { background: rgba(255,255,255,0.02); }
.card-table .mono      { font-family: var(--font-mono); font-size: 0.78rem; }
.card-table .excellent { color: var(--excellent); }
.card-table .good      { color: var(--good); }
.card-table .ok        { color: var(--ok); }
.card-table .bad       { color: var(--bad); }


/* ================================================================
   13e  KARTEN – KATEGORIE-AKZENTFARBEN
   ================================================================ */

.lex-card[data-category="fenster"]      { --card-accent: var(--cat-fenster); }
.lex-card[data-category="tueren"]       { --card-accent: var(--cat-tueren); }
.lex-card[data-category="sonnenschutz"] { --card-accent: var(--cat-sonnenschutz); }
.lex-card[data-category="materialien"]  { --card-accent: var(--cat-materialien); }
.lex-card[data-category="normen"]       { --card-accent: var(--cat-normen); }


/* ================================================================
   13f  KARTEN-ANIMATION (Einblenden beim Laden)
   ================================================================ */

.lex-card {
  opacity: 0; transform: translateY(20px);
  animation: card-in 0.5s ease forwards;
}
@keyframes card-in { to { opacity: 1; transform: translateY(0); } }

.lex-card:nth-child(1)    { animation-delay: 0.05s; }
.lex-card:nth-child(2)    { animation-delay: 0.10s; }
.lex-card:nth-child(3)    { animation-delay: 0.15s; }
.lex-card:nth-child(4)    { animation-delay: 0.20s; }
.lex-card:nth-child(5)    { animation-delay: 0.25s; }
.lex-card:nth-child(6)    { animation-delay: 0.30s; }
.lex-card:nth-child(7)    { animation-delay: 0.35s; }
.lex-card:nth-child(8)    { animation-delay: 0.40s; }
.lex-card:nth-child(9)    { animation-delay: 0.45s; }
.lex-card:nth-child(10)   { animation-delay: 0.50s; }
.lex-card:nth-child(n+11) { animation-delay: 0.55s; }


/* ================================================================
   13g  „MEHR"-BUTTON & NO-RESULTS
   ================================================================ */

/* „Details"-Button auf der Karte */
.card-more-btn {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-family: var(--font-mono); font-size: 0.67rem;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--amber); background: none; border: none;
  cursor: pointer; padding: 0.5rem 0; margin-top: 0.75rem;
  transition: gap 0.2s;
}
.card-more-btn:hover { gap: 0.6rem; }
.card-more-btn svg { width: 12px; height: 12px; }

/* Keine Treffer bei Suche/Filter */
.no-results {
  max-width: 1280px; margin: 0 auto;
  text-align: center;
  padding: 5rem 2rem;
  color: var(--text-muted);
}
.no-results svg {
  width: 64px; height: 64px;
  stroke: var(--border-light);
  margin-bottom: 1.5rem;
}
.no-results p      { font-size: 1.05rem; margin-bottom: 1.5rem; }
.no-results strong { color: var(--text-dim); }

/* Reset-Button */
.btn-reset {
  font-family: var(--font-mono);
  font-size: 0.72rem; letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber); background: none;
  border: 1px solid var(--amber);
  padding: 0.5rem 1.25rem; border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.btn-reset:hover { background: var(--amber); color: var(--bg); }

/* Bild-Attribution */
.attribution {
  max-width: 1280px; margin: 0 auto;
  padding: 0.75rem 2rem 1.5rem;
  font-family: var(--font-mono); font-size: 0.62rem;
  letter-spacing: 0.05em; color: var(--text-muted);
}
.attribution a { color: var(--amber); }
.attribution a:hover { text-decoration: underline; }


/* ================================================================
   14  GLOSSAR / SCHNELLREFERENZ
   ================================================================ */

.glossar-section {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 3.5rem 2rem;
}
.glossar-inner { max-width: 1280px; margin: 0 auto; }

.section-heading {
  font-family: var(--font-display);
  font-size: 1.6rem; font-weight: 400;
  letter-spacing: -0.01em; color: var(--text);
  margin-bottom: 2rem;
}
.section-heading::after {
  content: '';
  display: block; height: 1px; width: 48px;
  background: var(--amber); margin-top: 0.5rem;
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1rem;
}
.qr-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1rem;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s;
}
.qr-card:hover { border-color: var(--amber); transform: translateY(-2px); }

.qr-symbol {
  font-family: var(--font-display);
  font-size: 1.9rem; font-weight: 700;
  color: var(--amber-light); line-height: 1.1;
  margin-bottom: 0.4rem;
}
.qr-symbol sub { font-size: 0.55em; font-family: var(--font-mono); }
.qr-name  { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 0.25rem; }
.qr-unit  { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-muted); }


/* ================================================================
   15  U-WERT RECHNER
   ================================================================ */

.rechner-section {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 4rem 2rem;
}
.rechner-inner { max-width: 1280px; margin: 0 auto; }
.rechner-sub {
  color: var(--text-dim); font-size: 1rem;
  max-width: 580px; margin-bottom: 2.5rem; line-height: 1.65;
}

/* Zwei-Spalten-Layout: Formular | Ergebnis */
.rechner-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2.5rem;
  align-items: start;
}
.rechner-form { display: flex; flex-direction: column; gap: 1.25rem; }

/* Einzelne Slider-Gruppe */
.rf-group { display: flex; flex-direction: column; gap: 0.4rem; }
.rf-label {
  font-family: var(--font-mono);
  font-size: 0.72rem; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--text-muted);
}
.rf-input-row { display: flex; align-items: center; gap: 0.75rem; }

.rf-range {
  flex: 1;
  -webkit-appearance: none; height: 3px;
  background: var(--border-light); border-radius: 2px;
  outline: none; cursor: pointer;
  accent-color: var(--amber);
}
.rf-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--amber);
  border: 2px solid var(--bg); cursor: pointer;
  box-shadow: 0 0 0 2px rgba(200,150,59,0.3);
  transition: box-shadow 0.2s;
}
.rf-range:hover::-webkit-slider-thumb { box-shadow: 0 0 0 4px rgba(200,150,59,0.25); }

.rf-val {
  font-family: var(--font-mono); font-size: 0.9rem;
  color: var(--amber-light); min-width: 3.8rem; text-align: right;
}
.rf-unit {
  font-family: var(--font-mono); font-size: 0.65rem;
  color: var(--text-muted); min-width: 4.5rem;
}

/* Ergebnis-Karte (sticky beim Scrollen) */
.rechner-result {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  position: sticky; top: 84px;
  text-align: center;
}
.rr-label {
  font-family: var(--font-mono);
  font-size: 0.65rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-muted);
  margin-bottom: 0.5rem;
}
.rr-value {
  font-family: var(--font-display);
  font-size: 3.8rem; font-weight: 700;
  line-height: 1; color: var(--amber);
  margin-bottom: 0.25rem; transition: color 0.4s;
}
.rr-unit {
  font-family: var(--font-mono); font-size: 0.75rem;
  color: var(--text-muted); margin-bottom: 1.25rem;
}

/* Qualitäts-Badge */
.rr-badge {
  display: inline-block;
  font-family: var(--font-mono); font-size: 0.72rem;
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 0.3rem 0.85rem; border-radius: 100px;
  margin-bottom: 1.5rem;
  border: 1px solid currentColor;
  transition: all 0.4s;
}
.rr-badge.excellent { color: var(--excellent); background: rgba(79,168,212,0.08); }
.rr-badge.good      { color: var(--good);      background: rgba(76,175,110,0.08); }
.rr-badge.ok        { color: var(--ok);         background: rgba(212,168,67,0.08); }
.rr-badge.bad       { color: var(--bad);        background: rgba(224,84,84,0.08); }

/* Formel-Anzeige */
.rr-formula {
  font-family: var(--font-mono); font-size: 0.67rem;
  color: var(--text-muted);
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.55rem 0.75rem; line-height: 1.6;
  text-align: left; margin-bottom: 1rem;
}
.rr-breakdown {
  font-family: var(--font-mono); font-size: 0.67rem;
  color: var(--text-muted); text-align: left;
  line-height: 1.7; margin-bottom: 1rem;
}

/* Farbskala-Balken */
.rrs-bar {
  position: relative; height: 6px;
  background: linear-gradient(to right,
    var(--excellent) 0%, var(--good) 25%,
    var(--ok) 45%, var(--bad) 70%, #a00 100%);
  border-radius: 3px; margin-bottom: 0.4rem;
}
.rrs-fill {
  position: absolute; left: 0; top: 0; height: 100%;
  background: rgba(0,0,0,0.4);
  border-radius: 3px 0 0 3px; transition: width 0.4s;
}
.rrs-marker {
  position: absolute; top: -4px;
  width: 14px; height: 14px;
  background: var(--amber);
  border: 2px solid var(--bg3); border-radius: 50%;
  transform: translateX(-50%); transition: left 0.4s;
  box-shadow: 0 0 8px rgba(200,150,59,0.5);
}
.rrs-labels {
  display: flex; justify-content: space-between;
  font-family: var(--font-mono); font-size: 0.6rem;
  color: var(--text-muted);
}


/* ================================================================
   16  MODAL
   ================================================================ */

/* Dunkler Hintergrund */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(7,9,11,0.82);
  backdrop-filter: blur(6px);
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s;
}
.modal-backdrop.open { opacity: 1; pointer-events: all; }

/* Modal-Fenster */
.modal {
  position: fixed; z-index: 201;
  top: 50%; left: 50%;
  transform: translate(-50%, -42%) scale(0.96);
  width: min(720px, 94vw);
  max-height: 90vh; overflow-y: auto;
  background: var(--bg2);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  box-shadow: 0 32px 80px rgba(0,0,0,0.6);
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
}
.modal.open {
  opacity: 1; pointer-events: all;
  transform: translate(-50%, -50%) scale(1);
}

/* Schließen-Button */
.modal-close {
  position: sticky; top: 0; float: right;
  margin: 1rem 1rem 0 0;
  background: var(--bg3);
  border: 1px solid var(--border); border-radius: 50%;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-dim); z-index: 10;
  transition: background 0.2s, color 0.2s;
}
.modal-close:hover { background: var(--bad); color: #fff; }
.modal-close svg { width: 16px; height: 16px; }

/* Inhalt */
.modal-body  { padding: 1.5rem 2rem 2rem; clear: both; }
.modal-img {
  width: 100%; height: 200px; object-fit: cover;
  border-radius: var(--radius-lg); margin-bottom: 1.5rem;
  filter: saturate(0.45) brightness(0.6);
}
.modal-cat-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.62rem; letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem; border-radius: 2px;
  margin-bottom: 0.75rem; font-weight: 500;
}
.modal-title {
  font-family: var(--font-display);
  font-size: 2.2rem; font-weight: 700;
  letter-spacing: -0.02em; color: var(--text);
  margin-bottom: 0.75rem; line-height: 1.15;
}
.modal-def {
  font-size: 1.05rem; line-height: 1.7;
  color: var(--text-dim); margin-bottom: 1.5rem;
}
.modal-section-title {
  font-family: var(--font-mono);
  font-size: 0.65rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-muted);
  margin: 1.5rem 0 0.6rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.modal-section-title::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}
.modal-detail { font-size: 0.97rem; line-height: 1.65; color: var(--text-dim); }
.modal-values {
  display: flex; flex-direction: column; gap: 0.4rem;
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 0.85rem 1rem;
  margin-bottom: 1rem;
}
.modal-tip {
  background: rgba(200,150,59,0.07);
  border-left: 3px solid var(--amber);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 0.75rem 1rem;
  font-size: 0.9rem; color: var(--text-dim); line-height: 1.6;
}
.modal-tip strong { color: var(--amber-light); }


/* ================================================================
   17  FOOTER
   ================================================================ */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
}
.footer-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; flex-direction: column; gap: 0.5rem;
  align-items: center; text-align: center;
}
.footer-logo {
  display: flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-display); font-size: 1.05rem;
  color: var(--text-dim); text-decoration: none;
}
.footer-logo:hover .logo-window { opacity: 0.8; }
.footer-copy  { font-size: 0.82rem; color: var(--text-muted); }
.footer-norms {
  font-family: var(--font-mono); font-size: 0.65rem;
  letter-spacing: 0.06em; color: var(--text-muted);
}


/* ================================================================
   18a  RESPONSIVE – ≤ 900 px (Tablet)
   ================================================================ */

@media (max-width: 900px) {
  /* Navigation: Hamburger ein, Links als Dropdown */
  .main-nav {
    display: none;
    flex-direction: column;
  }
  .main-nav.open {
    display: flex;
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    padding: 1rem; gap: 0.25rem;
  }
  .hamburger { display: flex; }

  /* Hero */
  .hero-window { display: none; }
  .hero-content { max-width: 100%; }
  .hero-sub { max-width: 100%; }
  .hero-title { font-size: clamp(2.2rem, 10vw, 3.5rem); }
  .hero-stats { flex-wrap: wrap; gap: 0.5rem 2.5rem; }
  .stat-divider { display: none; }
  .stat-num { font-size: 2.2rem; }

  /* Foto-Strip */
  .cat-photo-strip { height: 160px; }
  .cps-label { font-size: 0.85rem; }
  .hph-2, .hph-3 { display: none; }
  .hph-1 { width: 60%; }

  /* Karten nie doppelt breit */
  .lex-card.wide { grid-column: span 1 !important; }

  /* Rechner: untereinander */
  .rechner-layout { grid-template-columns: 1fr; }
  .rechner-result { position: static; }
}


/* ================================================================
   18b  RESPONSIVE – ≤ 600 px (Mobil groß)
   ================================================================ */

@media (max-width: 600px) {
  .header-inner { padding: 0 1.25rem; }

  /* Hero */
  .hero { padding: 4rem 1.25rem 3rem; }

  /* Suche & Filter */
  .search-section  { padding-left: 1.25rem; padding-right: 1.25rem; }
  .filter-section  { padding-left: 1.25rem; padding-right: 1.25rem; }

  /* Lexikon-Grid: eine Spalte */
  .lexikon-section { padding: 1.5rem 1.25rem 3rem; }
  .lexikon-grid { grid-template-columns: 1fr; }

  /* Foto-Strip: 3er-Reihe */
  .cat-photo-strip { height: auto; flex-wrap: wrap; }
  .cps-item { flex: 1 1 33%; height: 120px; }
  .lex-card.has-img .card-img { height: 140px; }

  /* Glossar */
  .qr-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
}


/* ================================================================
   18c  RESPONSIVE – ≤ 480 px (Mobil klein)
   ================================================================ */

@media (max-width: 480px) {
  body { font-size: 15px; }

  /* Hero */
  .hero { min-height: auto; padding: 3rem 1rem 2.5rem; }
  .hero-bg-text { display: none; }
  .hero-content { max-width: 100%; width: 100%; padding-right: 0; }
  .hero-label { margin-bottom: 1rem; }
  .hero-sub { font-size: 1rem; max-width: 100%; margin-bottom: 2rem; }

  /* Stats: 2-Spalten-Grid */
  .hero-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem; width: 100%;
  }
  .stat { padding: 0; }
  .stat-num { font-size: 2rem; }
  .stat-label { font-size: 0.62rem; }

  /* Foto-Strip: 2 Spalten */
  .cps-item { flex: 1 1 50%; height: 110px; }

  /* Suche & Filter */
  .search-section { padding-left: 1rem; padding-right: 1rem; }
  .search-shortcut { display: none; }
  .filter-section { padding-left: 1rem; padding-right: 1rem; }
  .filter-btn { font-size: 0.65rem; padding: 0.4rem 0.7rem; }

  /* Lexikon */
  .lexikon-section { padding: 1rem 1rem 3rem; }
  .lexikon-grid { gap: 1rem; }
  .card-title { font-size: 1.3rem; }

  /* A-Z */
  .az-section { padding: 0.5rem 1rem; }
  .az-btn { padding: 0.2rem 0.35rem; font-size: 0.65rem; }

  /* Rechner */
  .rechner-result { position: static; margin-top: 1.5rem; }
  .rf-unit { display: none; }
  .rr-value { font-size: 3rem; }

  /* Modal */
  .modal { width: 96vw; max-height: 92vh; }
  .modal-body { padding: 1rem 1.25rem 1.5rem; }
  .modal-title { font-size: 1.6rem; }

  /* Footer */
  .site-footer { padding: 1.5rem 1rem; }
  .footer-inner { align-items: flex-start; gap: 0.5rem; }
  .footer-logo { font-size: 0.95rem; }
}


/* ================================================================
   19  SONSTIGES
   ================================================================ */

/* Kaufmännisches Und in DM Mono */
.amp {
  font-family: var(--font-mono);
  font-size: 0.82em;
  opacity: 0.7;
}

/* Nav-Link Rechner-Highlight */
.nav-link[data-filter="rechner"] {
  color: var(--amber-light);
  background: var(--amber-dim);
}