/* =============================================================
   NORMRECHNER v2 – Stylesheet
   Dark Mode | Anthrazit / Dunkelgrau | Blaue Akzentfarbe
   ============================================================= */

/* ── Custom Properties ── */
:root {
  --bg-base:      #0f1117;
  --bg-surface:   #181c24;
  --bg-elevated:  #1e2330;
  --bg-hover:     #252c3b;

  --gray-100: #f0f2f5;
  --gray-300: #9aa3b5;
  --gray-400: #6b7690;
  --gray-500: #4b5568;
  --gray-600: #343d52;
  --gray-700: #2a3244;

  --accent:       #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: rgba(59,130,246,0.15);
  --accent-glow:  rgba(59,130,246,0.25);

  --text-primary:   #e8ecf4;
  --text-secondary: #9aa3b5;
  --text-muted:     #5a6480;

  --error:    #ef4444;
  --error-bg: rgba(239,68,68,0.1);
  --success:  #22c55e;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.6);

  --font-sans: 'Segoe UI', system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;

  --nav-height: 60px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--gray-600); border-radius: 3px; }
[hidden] { display: none !important; }

/* ─────────────────────────────────────────────────────────────
   NAVIGATION
───────────────────────────────────────────────────────────── */
.main-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(15,17,23,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-700);
  z-index: 200;
  transition: box-shadow 0.3s;
}
.main-nav.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,0.6); }

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo-icon {
  width: 28px; height: 28px;
  filter: drop-shadow(0 0 6px var(--accent-glow));
}
.nav-logo-text {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.18s, background 0.18s;
  white-space: nowrap;
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-hover); }
.nav-link.active { color: var(--accent); background: var(--accent-light); }
.nav-link-fav { color: var(--text-muted); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: var(--nav-height); left: 0; right: 0;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--gray-700);
  padding: 16px 24px 24px;
  z-index: 190;
  transform: translateY(-110%);
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}
.mobile-drawer.open { transform: translateY(0); }

.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 180;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s;
}
.drawer-overlay.open { opacity: 1; pointer-events: all; }

.mobile-links { list-style: none; display: flex; flex-direction: column; gap: 4px; }
.mobile-link {
  display: block;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  transition: color 0.18s, background 0.18s;
}
.mobile-link:hover, .mobile-link.active { color: var(--text-primary); background: var(--bg-hover); }

/* ─────────────────────────────────────────────────────────────
   APP ROOT & PAGE TRANSITIONS
───────────────────────────────────────────────────────────── */
#appRoot { flex: 1; padding-top: var(--nav-height); }

.page { display: none; }
.page.active { display: block; animation: pageFadeIn 0.35s ease; }

@keyframes pageFadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─────────────────────────────────────────────────────────────
   HERO / LANDINGPAGE
───────────────────────────────────────────────────────────── */
.hero {
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 24px 40px;
  position: relative;
  overflow: hidden;
}

/* Grid Background */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59,130,246,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.hero-content {
  flex: 1;
  max-width: 560px;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-light);
  border: 1px solid rgba(59,130,246,0.35);
  border-radius: 100px;
  padding: 5px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 28px;
}
.hero-badge-dot {
  width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1.05;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.hero-title-accent {
  color: var(--accent);
  text-shadow: 0 0 40px var(--accent-glow);
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 460px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 14px 28px;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: 0 4px 20px var(--accent-glow);
  transition: background 0.18s, box-shadow 0.18s, transform 0.15s;
  margin-bottom: 48px;
}
.hero-cta:hover {
  background: var(--accent-hover);
  box-shadow: 0 6px 28px var(--accent-glow);
  transform: translateY(-2px);
}
.hero-cta:active { transform: translateY(0); }

.hero-stats {
  display: flex;
  align-items: center;
  gap: 20px;
}
.stat-item { display: flex; flex-direction: column; gap: 3px; }
.stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}
.stat-label { font-size: 0.72rem; color: var(--text-muted); letter-spacing: 0.06em; text-transform: uppercase; }
.stat-divider { width: 1px; height: 36px; background: var(--gray-700); }

/* Hero Illustration */
.hero-illustration {
  flex-shrink: 0;
  position: relative;
  width: 340px;
  height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.illus-bolt {
  position: absolute;
  left: 30px; top: 50%;
  transform: translateY(-50%);
  filter: drop-shadow(0 0 12px rgba(59,130,246,0.3));
  animation: floatY 4s ease-in-out infinite;
}
.illus-nut {
  position: absolute;
  right: 20px; top: 30px;
  filter: drop-shadow(0 0 8px rgba(59,130,246,0.2));
  animation: floatY 4s ease-in-out infinite 1s;
}
.illus-washer {
  position: absolute;
  right: 10px; bottom: 60px;
  filter: drop-shadow(0 0 8px rgba(59,130,246,0.2));
  animation: floatY 4s ease-in-out infinite 2s;
}
.illus-spring {
  position: absolute;
  right: 130px; top: 20px;
  filter: drop-shadow(0 0 8px rgba(59,130,246,0.2));
  animation: floatY 4s ease-in-out infinite 0.5s;
}

@keyframes floatY {
  0%, 100% { transform: translateY(-50%); }
  50% { transform: translateY(calc(-50% - 10px)); }
}
.illus-bolt { animation: floatBolt 4s ease-in-out infinite; }
@keyframes floatBolt {
  0%, 100% { transform: translateY(-50%) translateX(0); }
  50% { transform: translateY(calc(-50% - 8px)) translateX(0); }
}

.illus-dot {
  position: absolute;
  border-radius: 50%;
  background: var(--accent);
  animation: dotPulse 3s ease-in-out infinite;
}
.illus-dot-1 { width: 6px; height: 6px; top: 60px; left: 140px; opacity: 0.6; animation-delay: 0s; }
.illus-dot-2 { width: 4px; height: 4px; bottom: 80px; left: 160px; opacity: 0.4; animation-delay: 1s; }
.illus-dot-3 { width: 8px; height: 8px; top: 200px; right: 60px; opacity: 0.3; animation-delay: 2s; }
@keyframes dotPulse {
  0%, 100% { transform: scale(1); opacity: 0.4; }
  50% { transform: scale(1.6); opacity: 0.8; }
}

/* ─────────────────────────────────────────────────────────────
   KATEGORIE-SECTION (Home)
───────────────────────────────────────────────────────────── */
.category-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.section-header {
  text-align: center;
  margin-bottom: 36px;
}
.section-title {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.section-sub {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.cat-card {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-xl);
  padding: 24px;
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: border-color 0.2s, background 0.2s, transform 0.18s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}
.cat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.25s;
}
.cat-card:hover {
  border-color: var(--accent);
  background: var(--bg-elevated);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(59,130,246,0.15);
}
.cat-card:hover::before { opacity: 1; }

.cat-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  flex-shrink: 0;
}

.cat-card-body { flex: 1; }
.cat-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.cat-card-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  line-height: 1.4;
}
.cat-card-count {
  display: inline-flex;
  align-items: center;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-light);
  padding: 3px 9px;
  border-radius: 100px;
}

.cat-card-arrow {
  color: var(--text-muted);
  font-size: 1.2rem;
  transition: color 0.18s, transform 0.18s;
}
.cat-card:hover .cat-card-arrow { color: var(--accent); transform: translateX(4px); }

/* ─────────────────────────────────────────────────────────────
   DETAIL PAGES
───────────────────────────────────────────────────────────── */
.page-detail { min-height: calc(100vh - var(--nav-height)); }

.page-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.back-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.82rem;
  font-family: var(--font-sans);
  cursor: pointer;
  padding: 4px 0;
  transition: opacity 0.18s;
}
.back-btn:hover { opacity: 0.7; }
.breadcrumb-sep { color: var(--gray-600); }
.breadcrumb-current { color: var(--text-secondary); }

.detail-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--gray-700);
}
.detail-header-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px; height: 56px;
  background: var(--accent-light);
  border: 1px solid rgba(59,130,246,0.3);
  border-radius: var(--radius-lg);
  flex-shrink: 0;
}
.detail-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.detail-sub { font-size: 0.85rem; color: var(--text-muted); }

/* Sub-Kategorien (Federn) */
.sub-category-grid {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.sub-cat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--gray-600);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: border-color 0.18s, color 0.18s, background 0.18s;
  min-width: 110px;
}
.sub-cat-card:hover, .sub-cat-card.active-sub {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}
.sub-cat-icon { display: flex; align-items: center; justify-content: center; height: 40px; }

/* Coming Soon */
.coming-soon-card {
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.coming-soon-icon { font-size: 2.5rem; color: var(--accent); }
.coming-soon-card h2 { font-size: 1.4rem; font-weight: 700; }
.coming-soon-card p { color: var(--text-muted); max-width: 400px; line-height: 1.6; }
.coming-soon-badge {
  display: inline-block;
  background: var(--accent-light);
  border: 1px solid rgba(59,130,246,0.4);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 5px 14px;
  border-radius: 100px;
}

/* ─────────────────────────────────────────────────────────────
   CARD (Eingabe)
───────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-xl);
  padding: 28px 28px 24px;
  box-shadow: var(--shadow-md);
}
.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--gray-700);
}
.card-header-icon { font-size: 1rem; color: var(--accent); }
.card-title {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-primary);
}

/* Form Grid */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 22px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label {
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.label-required { color: var(--accent); margin-left: 3px; }

/* Select */
.select-wrapper { position: relative; }
.select-wrapper select {
  width: 100%;
  appearance: none;
  background: var(--bg-elevated);
  border: 1px solid var(--gray-600);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.93rem;
  padding: 10px 38px 10px 13px;
  cursor: pointer;
  transition: border-color 0.18s, box-shadow 0.18s;
  outline: none;
}
.select-wrapper select:hover { border-color: var(--gray-400); }
.select-wrapper select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); }
.select-wrapper select option { background: var(--bg-elevated); color: var(--text-primary); }
.select-arrow { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); color: var(--text-secondary); pointer-events: none; font-size: 0.82rem; }

/* Input */
.input-wrapper { position: relative; display: flex; align-items: center; }
.input-wrapper input[type="number"] {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--gray-600);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.93rem;
  padding: 10px 50px 10px 13px;
  outline: none;
  transition: border-color 0.18s, box-shadow 0.18s;
  -moz-appearance: textfield;
}
.input-wrapper input[type="number"]::-webkit-inner-spin-button,
.input-wrapper input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }
.input-wrapper input[type="number"]::placeholder { color: var(--text-muted); }
.input-wrapper input[type="number"]:hover { border-color: var(--gray-400); }
.input-wrapper input[type="number"]:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); }
.input-unit { position: absolute; right: 13px; color: var(--text-secondary); font-size: 0.78rem; font-weight: 600; pointer-events: none; }

/* Error */
.form-error {
  margin-top: 14px;
  background: var(--error-bg);
  border: 1px solid var(--error);
  border-radius: var(--radius-md);
  color: var(--error);
  font-size: 0.86rem;
  padding: 10px 14px;
  display: flex; align-items: center; gap: 8px;
}
.form-error::before { content: '⚠'; font-size: 1rem; flex-shrink: 0; }

/* Buttons */
.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--gray-700);
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: none;
  border-radius: var(--radius-md);
  padding: 11px 22px;
  cursor: pointer;
  transition: background 0.18s, box-shadow 0.18s, transform 0.1s;
  outline: none;
}
.btn:focus-visible { box-shadow: 0 0 0 3px var(--accent-light); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 2px 10px var(--accent-glow); }
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 4px 18px var(--accent-glow); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost { background: transparent; color: var(--text-secondary); border: 1px solid var(--gray-600); }
.btn-ghost:hover { background: var(--bg-hover); color: var(--text-primary); border-color: var(--gray-400); }
.btn-icon { font-size: 1rem; }

/* ─────────────────────────────────────────────────────────────
   ERGEBNISBEREICH
───────────────────────────────────────────────────────────── */
.result-section {
  display: flex;
  flex-direction: column;
  gap: 14px;
  animation: pageFadeIn 0.35s ease;
}

.result-designation-card {
  background: linear-gradient(135deg, #1a2540 0%, #1e2c50 100%);
  border: 1px solid var(--accent);
  border-radius: var(--radius-xl);
  padding: 26px 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
  box-shadow: 0 0 28px var(--accent-glow), var(--shadow-md);
  position: relative;
  overflow: hidden;
}
.result-designation-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
.result-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.result-designation {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.04em;
  word-break: break-all;
}
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-light);
  border: 1px solid rgba(59,130,246,0.4);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 6px 13px;
  cursor: pointer;
  transition: background 0.18s, border-color 0.18s;
  margin-top: 4px;
  outline: none;
}
.copy-btn:hover { background: rgba(59,130,246,0.22); border-color: var(--accent); }

.result-info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.info-card {
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  transition: border-color 0.18s, background 0.18s;
}
.info-card:hover { border-color: var(--gray-500); background: var(--bg-elevated); }
.info-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.info-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

/* ─────────────────────────────────────────────────────────────
   FOOTER
───────────────────────────────────────────────────────────── */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--gray-700);
  padding: 16px 24px;
  text-align: center;
  font-size: 0.73rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* ─────────────────────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero { flex-direction: column; padding-top: 40px; gap: 32px; min-height: auto; }
  .hero-illustration { width: 100%; height: 200px; }
  .illus-bolt { left: 50%; transform: translateX(-120px) translateY(-50%); }
  .illus-nut { right: 30px; top: 10px; }
  .illus-washer { right: 20px; bottom: 10px; }
  .illus-spring { right: auto; left: 30px; top: 10px; }
  .category-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .form-grid { grid-template-columns: 1fr; gap: 14px; }
  .result-info-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .page-inner { padding: 20px 16px 48px; }
  .hero { padding: 32px 16px 32px; }
  .category-section { padding: 0 16px 48px; }
  .hero-stats { gap: 14px; }
  .stat-value { font-size: 1.3rem; }
  .sub-category-grid { gap: 8px; }
  .sub-cat-card { min-width: 90px; padding: 12px 14px; }
  .cat-card { padding: 18px; gap: 14px; }
  .cat-card-icon { width: 52px; }
}

@media (max-width: 480px) {
  .result-designation { font-size: 1.1rem; }
  .result-info-grid { grid-template-columns: 1fr 1fr; }
  .form-actions { flex-direction: column; }
  .btn { justify-content: center; width: 100%; }
  .hero-title { font-size: 2rem; }
  .hero-illustration { display: none; }
}

@media (max-width: 360px) {
  .result-info-grid { grid-template-columns: 1fr; }
}

/* =============================================================
   ENGINEERING TOOLS SECTION (Home)
   ============================================================= */
.engineering-tools-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 80px;
}
.category-grid-tools { grid-template-columns: repeat(2, 1fr); }
.cat-card-tool .cat-card-count { background: rgba(59,130,246,0.08); }
.cat-card-count-cam { background: rgba(16,185,129,0.1) !important; color: #10b981 !important; }
.nav-link-cam { color: #10b981 !important; }
.nav-link-cam:hover { background: rgba(16,185,129,0.1) !important; color: #10b981; }
.nav-link-cam.active { background: rgba(16,185,129,0.15) !important; color: #10b981; }

/* =============================================================
   WIDER PAGE INNER
   ============================================================= */
.page-inner-wide {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* =============================================================
   TAB NAVIGATION (shared)
   ============================================================= */
.tab-nav {
  display: flex;
  gap: 6px;
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: 6px;
  width: fit-content;
}
.tab-btn {
  display: inline-flex;
  align-items: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 600;
  padding: 8px 18px;
  cursor: pointer;
  transition: color 0.18s, background 0.18s;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--text-primary); background: var(--bg-hover); }
.tab-btn.active-tab { background: var(--accent); color: #fff; box-shadow: 0 2px 10px var(--accent-glow); }

/* =============================================================
   SPRING CALC LAYOUT
   ============================================================= */
.form-grid-3 { grid-template-columns: repeat(3, 1fr); }
.form-group-wide { grid-column: span 2; }

.spring-tab-content { display: none; }
.spring-tab-content.active-spring-tab { display: flex; flex-direction: column; gap: 22px; animation: pageFadeIn 0.3s ease; }

.spring-calc-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 20px;
  align-items: start;
}

.spring-preview-card {
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-xl);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}
.spring-preview-header { width: 100%; }
.spring-preview-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.spring-svg-container {
  width: 100%;
  display: flex;
  justify-content: center;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: 12px;
}
.spring-svg-container svg { max-width: 180px; height: auto; }
.spring-preview-dims {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
}
.spring-dim-item {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  display: flex;
  justify-content: space-between;
  padding: 4px 8px;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
}
.spring-dim-item strong { color: var(--accent); }

/* Spring Results */
.spring-results {
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation: pageFadeIn 0.35s ease;
}
.spring-result-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--gray-700);
}
.spring-result-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}
.spring-result-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.spring-result-card {
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color 0.18s;
}
.spring-result-card:hover { border-color: var(--gray-500); }
.spring-result-highlight {
  background: linear-gradient(135deg, #1a2540, #1e2c50);
  border-color: rgba(59,130,246,0.3);
  box-shadow: 0 0 12px rgba(59,130,246,0.08);
}
.spring-result-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.spring-result-value {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}
.spring-result-highlight .spring-result-value { color: var(--accent); }
.spring-result-unit {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
}

.spring-safety-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
}
.spring-safety-label { font-size: 0.8rem; color: var(--text-secondary); white-space: nowrap; }
.spring-safety-track {
  flex: 1;
  height: 8px;
  background: var(--gray-700);
  border-radius: 4px;
  overflow: hidden;
}
.spring-safety-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.6s ease, background 0.4s;
  width: 0%;
}
.spring-safety-fill.safe { background: var(--success); }
.spring-safety-fill.warn { background: #f59e0b; }
.spring-safety-fill.danger { background: var(--error); }
.spring-safety-status {
  font-size: 0.82rem;
  font-weight: 700;
  white-space: nowrap;
  min-width: 80px;
  text-align: right;
}
.spring-safety-status.safe { color: var(--success); }
.spring-safety-status.warn { color: #f59e0b; }
.spring-safety-status.danger { color: var(--error); }

/* =============================================================
   CAM PAGE STYLES
   ============================================================= */
.cam-icon-bg { background: rgba(16,185,129,0.1) !important; border-color: rgba(16,185,129,0.3) !important; }

.cam-warning-banner {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.35);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  color: #fbbf24;
  font-size: 0.86rem;
  line-height: 1.6;
}
.cam-warning-banner strong { color: #f59e0b; }

.cam-tab-content { display: none; }
.cam-tab-content.active-cam-content { display: block; animation: pageFadeIn 0.3s ease; }

/* Upload Dropzone */
.upload-dropzone {
  background: var(--bg-surface);
  border: 2px dashed var(--gray-600);
  border-radius: var(--radius-xl);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
}
.upload-dropzone:hover, .upload-dropzone.drag-over {
  border-color: var(--accent);
  background: var(--accent-light);
}
.upload-dropzone-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.upload-icon { opacity: 0.7; transition: opacity 0.2s; }
.upload-dropzone:hover .upload-icon { opacity: 1; }
.upload-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 4px;
}
.upload-subtitle { font-size: 0.88rem; color: var(--text-secondary); }
.upload-formats { font-size: 0.78rem; color: var(--text-muted); }

/* Step Analysis Card */
.step-analysis-card {
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-xl);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  animation: pageFadeIn 0.35s ease;
}
.step-analysis-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--gray-700);
}
.step-file-info {
  display: flex;
  align-items: center;
  gap: 12px;
}
.step-filename {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-mono);
}
.step-filesize { font-size: 0.78rem; color: var(--text-muted); }
.step-badge-ok {
  background: rgba(34,197,94,0.12);
  border: 1px solid rgba(34,197,94,0.3);
  color: var(--success);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 100px;
}
.step-dims-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.step-dim-card {
  background: var(--bg-elevated);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.step-dim-label { font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-muted); }
.step-dim-value { font-size: 1.4rem; font-weight: 700; color: var(--accent); font-family: var(--font-mono); }
.step-dim-unit { font-size: 0.72rem; color: var(--text-secondary); }
.step-result-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* 3D Viewer */
.viewer-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.viewer-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--gray-700);
}
.viewer-toolbar-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  flex: 1;
}
.viewer-info-chips { display: flex; gap: 6px; }
.viewer-info-chip {
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: 100px;
  padding: 3px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}
.viewer-btns { display: flex; gap: 6px; }
.viewer-ctrl-btn {
  background: var(--bg-surface);
  border: 1px solid var(--gray-600);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 5px 12px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.viewer-ctrl-btn:hover { color: var(--text-primary); border-color: var(--gray-400); }
.viewer-ctrl-active { border-color: var(--accent); color: var(--accent); }
.viewer-container {
  position: relative;
  background: #0a0d14;
  height: 500px;
}
.viewer-container canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}
.viewer-empty-hint {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: var(--text-muted);
  font-size: 0.88rem;
  pointer-events: none;
}
.viewer-mouse-hint {
  display: flex;
  gap: 20px;
  padding: 10px 18px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--gray-700);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* G-Code Editor */
.gcode-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.gcode-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--gray-700);
  flex-wrap: wrap;
}
.gcode-toolbar-left { display: flex; align-items: center; gap: 10px; }
.gcode-toolbar-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.gcode-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
}
.gcode-status-chip {
  background: var(--bg-surface);
  border: 1px solid var(--gray-700);
  border-radius: 100px;
  padding: 3px 10px;
  font-size: 0.72rem;
  color: var(--text-muted);
}
.gcode-check {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}
.gcode-check input { accent-color: var(--accent); }
.btn-sm { padding: 7px 14px !important; font-size: 0.78rem !important; }
.gcode-editor {
  width: 100%;
  min-height: 440px;
  background: #0a0d14;
  color: #a8d8a8;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  border: none;
  outline: none;
  padding: 18px 22px;
  resize: vertical;
  tab-size: 2;
}
.gcode-editor::placeholder { color: var(--gray-600); }
.gcode-footer-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 18px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--gray-700);
  font-size: 0.73rem;
  color: var(--text-muted);
}
.gcode-footer-warn { color: #f59e0b; font-weight: 600; margin-left: auto; }

/* =============================================================
   RESPONSIVE – new sections
   ============================================================= */
@media (max-width: 900px) {
  .spring-calc-layout { grid-template-columns: 1fr; }
  .spring-preview-card { flex-direction: row; align-items: flex-start; }
  .spring-svg-container { max-width: 140px; }
  .spring-result-grid { grid-template-columns: repeat(2, 1fr); }
  .step-dims-grid { grid-template-columns: repeat(2, 1fr); }
  .form-grid-3 { grid-template-columns: 1fr 1fr; }
  .category-grid-tools { grid-template-columns: 1fr; }
  .viewer-container { height: 340px; }
}
@media (max-width: 768px) {
  .tab-nav { width: 100%; }
  .spring-preview-card { flex-direction: column; }
  .gcode-toolbar { flex-direction: column; align-items: flex-start; }
  .viewer-mouse-hint { flex-direction: column; gap: 5px; }
  .spring-result-grid { grid-template-columns: repeat(2, 1fr); }
  .step-result-actions { flex-direction: column; }
  .form-grid-3 { grid-template-columns: 1fr; }
  .form-group-wide { grid-column: span 1; }
}
@media (max-width: 480px) {
  .spring-result-grid { grid-template-columns: 1fr 1fr; }
  .step-dims-grid { grid-template-columns: 1fr 1fr; }
  .viewer-container { height: 260px; }
}

/* =============================================================
   QUALITÄTSSICHERUNG – Zeichnungsprüfung
   ============================================================= */

:root {
  --qs-color:       #10b981;
  --qs-color-dim:   #065f46;
  --qs-bg:          #0c1f18;
  --qs-bg-elevated: #112b1f;
  --qs-ok:          #22c55e;
  --qs-ok-bg:       rgba(34,197,94,0.12);
  --qs-warn:        #f59e0b;
  --qs-warn-bg:     rgba(245,158,11,0.12);
  --qs-err:         #ef4444;
  --qs-err-bg:      rgba(239,68,68,0.12);
}

/* QS icon wrap in detail-header */
.qs-icon-wrap {
  background: var(--qs-bg);
  border-color: var(--qs-color);
}

/* ── QS Landing Grid ── */
.qs-landing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-bottom: 32px;
}
.qs-main-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--gray-600);
  border-radius: var(--radius-lg);
  padding: 22px 22px 18px;
  text-align: left;
  cursor: pointer;
  transition: border-color .2s, background .2s, transform .15s;
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: var(--text-primary);
}
.qs-main-card:hover {
  border-color: var(--qs-color);
  background: var(--qs-bg);
  transform: translateY(-2px);
}
.qs-main-card-coming { opacity: .7; cursor: default; }
.qs-main-card-coming:hover {
  border-color: var(--gray-500);
  background: var(--bg-surface);
  transform: none;
}
.qs-main-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.qs-main-card-icon {
  width: 44px; height: 44px;
  background: var(--qs-bg);
  border: 1px solid var(--qs-color);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}
.qs-icon-dim { background: var(--bg-elevated); border-color: var(--gray-500); }
.qs-main-card-badge {
  font-size: 11px; font-weight: 600; letter-spacing: .04em;
  padding: 3px 9px; border-radius: 20px;
}
.qs-badge-active { background: rgba(16,185,129,.18); color: var(--qs-color); }
.qs-badge-coming { background: var(--bg-elevated); color: var(--gray-400); }
.qs-main-card-title { font-size: 17px; font-weight: 600; }
.qs-title-dim { color: var(--gray-400); }
.qs-main-card-desc { font-size: 13.5px; color: var(--text-secondary); line-height: 1.55; flex: 1; }
.qs-desc-dim { color: var(--gray-400); }
.qs-main-card-norms {
  display: flex; flex-wrap: wrap; gap: 6px;
}
.qs-main-card-norms span {
  font-size: 10.5px; background: var(--qs-bg); color: var(--qs-color);
  border: 1px solid var(--qs-color-dim); border-radius: 4px; padding: 2px 7px;
}
.qs-main-card-footer {
  font-size: 13px; font-weight: 600; color: var(--qs-color);
  margin-top: 4px;
}
.qs-footer-dim { color: var(--gray-400); }

/* ── Normen-Referenz ── */
.qs-norm-ref {
  background: var(--bg-surface);
  border: 1px solid var(--gray-600);
  border-radius: var(--radius-md);
  padding: 20px 22px;
}
.qs-norm-ref-title {
  font-size: 13px; font-weight: 600; color: var(--gray-300);
  text-transform: uppercase; letter-spacing: .06em; margin-bottom: 14px;
}
.qs-norm-ref-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px;
}
.qs-norm-tag {
  display: flex; align-items: center; gap: 10px;
  background: var(--bg-elevated); border-radius: 7px; padding: 9px 12px;
}
.qs-norm-id {
  font-size: 12px; font-weight: 700; color: var(--qs-color);
  background: var(--qs-bg); border: 1px solid var(--qs-color-dim);
  border-radius: 4px; padding: 2px 7px; white-space: nowrap;
}
.qs-norm-desc { font-size: 12.5px; color: var(--text-secondary); }

/* ── Warning Banner ── */
.qs-warning-banner {
  display: flex; align-items: flex-start; gap: 10px;
  background: rgba(245,158,11,.1); border: 1px solid rgba(245,158,11,.3);
  border-radius: var(--radius-sm); padding: 11px 14px;
  font-size: 13px; color: #fcd34d; line-height: 1.5;
  margin-bottom: 20px;
}
.qs-warning-banner svg { flex-shrink: 0; margin-top: 1px; }
.qs-warning-banner strong { color: var(--qs-warn); }

/* ── Tab Navigation ── */
.qs-tab-nav {
  display: flex; gap: 4px;
  background: var(--bg-surface);
  border: 1px solid var(--gray-600);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: 20px;
}
.qs-tab-btn {
  display: flex; align-items: center; gap: 7px;
  padding: 8px 16px; border-radius: 8px;
  font-size: 13.5px; font-weight: 500;
  background: transparent; color: var(--text-secondary);
  border: none; cursor: pointer; transition: all .18s;
  flex: 1; justify-content: center;
}
.qs-tab-btn:hover { background: var(--bg-elevated); color: var(--text-primary); }
.qs-tab-btn.active {
  background: var(--qs-bg); color: var(--qs-color);
  box-shadow: inset 0 0 0 1px var(--qs-color-dim);
}

/* ── Tab Content ── */
.qs-tab-content { display: none; }
.qs-tab-content.active { display: block; }

/* ── Drop Zone ── */
.qs-dropzone {
  border: 2px dashed var(--gray-500);
  border-radius: var(--radius-lg);
  background: var(--bg-surface);
  transition: border-color .2s, background .2s;
  cursor: pointer;
  margin-bottom: 20px;
}
.qs-dropzone.drag-over {
  border-color: var(--qs-color);
  background: var(--qs-bg);
}
.qs-dropzone-inner {
  display: flex; flex-direction: column; align-items: center;
  padding: 48px 24px 40px; gap: 10px; text-align: center;
}
.qs-dropzone-icon { margin-bottom: 4px; }
.qs-dropzone-text { font-size: 16px; font-weight: 600; color: var(--text-primary); }
.qs-dropzone-sub { font-size: 13px; color: var(--gray-400); }
.qs-select-btn {
  background: var(--qs-color); color: #000; font-size: 14px; font-weight: 700;
  border: none; border-radius: 8px; padding: 9px 22px; cursor: pointer;
  transition: opacity .18s; margin-top: 4px;
}
.qs-select-btn:hover { opacity: .85; }
.qs-format-badges {
  display: flex; gap: 7px; margin-top: 6px; flex-wrap: wrap; justify-content: center;
}
.qs-format-badge {
  font-size: 11.5px; font-weight: 600; padding: 3px 9px; border-radius: 5px;
  display: flex; align-items: center; gap: 5px;
}
.qs-format-active { background: var(--qs-bg); color: var(--qs-color); border: 1px solid var(--qs-color-dim); }
.qs-format-soon { background: var(--bg-elevated); color: var(--gray-400); border: 1px solid var(--gray-600); }
.qs-format-tag { font-size: 10px; color: var(--gray-400); font-weight: 400; }

/* ── File Info ── */
.qs-file-info { display: flex; flex-direction: column; gap: 16px; }
.qs-file-meta {
  display: flex; align-items: center; gap: 10px;
  background: var(--bg-surface); border: 1px solid var(--gray-600);
  border-radius: var(--radius-sm); padding: 10px 14px;
}
.qs-file-name { font-size: 14px; font-weight: 600; display: block; }
.qs-file-size { font-size: 12px; color: var(--gray-400); display: block; }
.qs-clear-btn {
  margin-left: auto; background: transparent; border: none; color: var(--gray-400);
  cursor: pointer; padding: 5px; border-radius: 5px; transition: color .15s;
}
.qs-clear-btn:hover { color: var(--qs-err); }

/* ── PDF Preview ── */
.qs-preview-wrap {
  background: var(--bg-surface); border: 1px solid var(--gray-600);
  border-radius: var(--radius-md); overflow: hidden;
}
.qs-preview-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 14px;
  background: var(--bg-elevated); border-bottom: 1px solid var(--gray-600);
  font-size: 12px; color: var(--gray-300); font-weight: 600; text-transform: uppercase; letter-spacing: .06em;
}
.qs-page-info { font-weight: 400; color: var(--gray-400); }
.qs-canvas-wrap {
  display: flex; justify-content: center; padding: 16px;
  background: #111; min-height: 300px; max-height: 550px; overflow-y: auto;
}
.qs-preview-canvas {
  max-width: 100%; height: auto; border-radius: 4px;
  box-shadow: 0 2px 12px rgba(0,0,0,.5);
}

/* ── Analyse Bar ── */
.qs-analyse-bar {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.qs-analyse-btn {
  display: flex; align-items: center; gap: 8px;
  background: var(--qs-color); color: #000; font-size: 14px; font-weight: 700;
  border: none; border-radius: 8px; padding: 11px 26px; cursor: pointer;
  transition: opacity .18s;
}
.qs-analyse-btn:hover { opacity: .85; }
.qs-analyse-btn:disabled { opacity: .5; cursor: default; }
.qs-analyse-progress { display: flex; flex-direction: column; gap: 5px; flex: 1; min-width: 200px; }
.qs-progress-bar-track {
  height: 6px; background: var(--bg-elevated); border-radius: 3px; overflow: hidden;
}
.qs-progress-bar-fill {
  height: 100%; width: 0%; background: var(--qs-color);
  border-radius: 3px; transition: width .3s;
}
.qs-progress-label { font-size: 12px; color: var(--gray-400); }

/* ── Empty State ── */
.qs-empty-state {
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  padding: 60px 24px; text-align: center;
  color: var(--gray-400); font-size: 14px; line-height: 1.6;
}

/* ── Summary Bar ── */
.qs-summary-bar {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  background: var(--bg-surface); border: 1px solid var(--gray-600);
  border-radius: var(--radius-md); padding: 16px 20px; margin-bottom: 20px;
}
.qs-summary-stat {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px; border-radius: 8px; flex-shrink: 0;
}
.qs-stat-ok  { background: var(--qs-ok-bg); }
.qs-stat-warn{ background: var(--qs-warn-bg); }
.qs-stat-err { background: var(--qs-err-bg); }
.qs-stat-icon { font-size: 15px; }
.qs-stat-ok  .qs-stat-icon { color: var(--qs-ok); }
.qs-stat-warn.qs-stat-icon { color: var(--qs-warn); }
.qs-stat-err .qs-stat-icon { color: var(--qs-err); }
.qs-stat-num { font-size: 22px; font-weight: 700; line-height: 1; }
.qs-stat-ok  .qs-stat-num { color: var(--qs-ok); }
.qs-stat-warn .qs-stat-num { color: var(--qs-warn); }
.qs-stat-err .qs-stat-num { color: var(--qs-err); }
.qs-stat-lbl { font-size: 12px; color: var(--text-secondary); }
.qs-summary-meter {
  margin-left: auto; display: flex; flex-direction: column; gap: 5px; min-width: 180px;
}
.qs-meter-track {
  height: 8px; background: var(--bg-elevated); border-radius: 4px; overflow: hidden;
}
.qs-meter-fill {
  height: 100%; width: 0%; border-radius: 4px; background: var(--qs-ok);
  transition: width .4s;
}
.qs-meter-label { font-size: 12px; color: var(--gray-300); text-align: right; }

/* ── Report Sections ── */
.qs-report-sections { display: flex; flex-direction: column; gap: 16px; }
.qs-report-section {
  background: var(--bg-surface); border: 1px solid var(--gray-600);
  border-radius: var(--radius-md); overflow: hidden;
}
.qs-report-section-header {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px;
  background: var(--bg-elevated); border-bottom: 1px solid var(--gray-600);
  font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em;
  color: var(--gray-300);
}
.qs-report-section-icon { font-size: 15px; }
.qs-report-section-count {
  margin-left: auto; font-size: 11.5px; font-weight: 600;
  background: var(--bg-base); color: var(--gray-400);
  border-radius: 10px; padding: 2px 8px;
}
.qs-report-items { display: flex; flex-direction: column; }
.qs-report-item {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 11px 16px; border-bottom: 1px solid var(--gray-700);
  font-size: 13.5px; line-height: 1.5;
}
.qs-report-item:last-child { border-bottom: none; }
.qs-item-status {
  font-size: 13px; flex-shrink: 0; margin-top: 1px; width: 16px; text-align: center;
}
.qs-item-ok   .qs-item-status { color: var(--qs-ok); }
.qs-item-warn .qs-item-status { color: var(--qs-warn); }
.qs-item-err  .qs-item-status { color: var(--qs-err); }
.qs-item-ok   { background: rgba(34,197,94,.03); }
.qs-item-warn { background: rgba(245,158,11,.04); }
.qs-item-err  { background: rgba(239,68,68,.04); }
.qs-item-body { flex: 1; }
.qs-item-title { font-weight: 600; margin-bottom: 2px; }
.qs-item-detail { font-size: 12.5px; color: var(--text-secondary); }
.qs-item-norm {
  font-size: 11px; font-weight: 700; color: var(--qs-color);
  background: var(--qs-bg); border: 1px solid var(--qs-color-dim);
  border-radius: 4px; padding: 1px 6px; white-space: nowrap; margin-top: 3px;
  display: inline-block;
}

/* ── Export Bar ── */
.qs-export-bar {
  margin-top: 20px; display: flex; gap: 10px; flex-wrap: wrap;
}
.qs-export-btn {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg-elevated); border: 1px solid var(--gray-500);
  color: var(--text-primary); font-size: 13.5px; font-weight: 600;
  border-radius: 8px; padding: 9px 20px; cursor: pointer;
  transition: border-color .18s, background .18s;
}
.qs-export-btn:hover { border-color: var(--qs-color); background: var(--qs-bg); }
.qs-export-btn-green {
  background: var(--qs-bg); border-color: var(--qs-color); color: var(--qs-color);
}
.qs-export-btn-green:hover { background: rgba(16,185,129,.15); }

/* ── Annotated PDF Tab ── */
.qs-pdf-toolbar {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  background: var(--bg-surface); border: 1px solid var(--gray-600);
  border-radius: var(--radius-sm); padding: 8px 14px; margin-bottom: 14px;
}
.qs-pdf-page-nav { display: flex; align-items: center; gap: 10px; }
.qs-page-btn {
  background: var(--bg-elevated); border: 1px solid var(--gray-600);
  color: var(--text-primary); border-radius: 6px; padding: 4px 12px;
  cursor: pointer; font-size: 14px; transition: border-color .15s;
}
.qs-page-btn:hover { border-color: var(--qs-color); }
.qs-page-indicator { font-size: 13px; color: var(--gray-300); }
.qs-pdf-view-info {
  display: flex; align-items: center; gap: 5px;
  font-size: 12px; color: var(--gray-400);
}
.qs-annotated-wrap {
  display: flex; justify-content: center; padding: 16px;
  background: #111; border-radius: var(--radius-md); min-height: 300px;
  overflow-y: auto;
}
.qs-annotated-canvas {
  max-width: 100%; height: auto; border-radius: 4px;
  box-shadow: 0 2px 12px rgba(0,0,0,.5);
}

/* ── Coming Soon Card for QS ── */
.qs-coming-features {
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 8px;
}
.qs-coming-features span {
  font-size: 13px; color: var(--gray-300);
  background: var(--bg-elevated); border: 1px solid var(--gray-600);
  border-radius: 6px; padding: 5px 12px;
}

/* ── Nav: QS dropdown styles ── */
.nav-link-qs { display: flex; align-items: center; gap: 5px; }
.nav-dd-caret { width: 12px; height: 12px; }
.nav-item-dropdown { position: relative; }
.nav-dropdown-menu {
  display: none; position: absolute; top: calc(100% + 4px); left: 0;
  background: var(--bg-elevated); border: 1px solid var(--gray-600);
  border-radius: var(--radius-md); min-width: 210px;
  box-shadow: var(--shadow-lg); z-index: 200; overflow: hidden;
}
.nav-item-dropdown:hover .nav-dropdown-menu,
.nav-item-dropdown.open .nav-dropdown-menu { display: block; }
.nav-dropdown-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 11px 16px; font-size: 14px; color: var(--text-primary);
  text-decoration: none; transition: background .15s;
}
.nav-dropdown-item:hover { background: var(--bg-hover); color: var(--qs-color); }
.nav-dropdown-item-dim { color: var(--gray-400); }
.nav-dropdown-item-dim:hover { color: var(--gray-300); }
.nav-dd-badge {
  font-size: 10.5px; background: var(--bg-base); color: var(--gray-400);
  border: 1px solid var(--gray-600); border-radius: 4px; padding: 1px 6px;
}

/* ── Cat card QS ── */
.cat-card-qs { border-color: var(--qs-color-dim); }
.cat-card-qs:hover { border-color: var(--qs-color); background: var(--qs-bg); }
.cat-card-count-qs { color: var(--qs-color); background: var(--qs-bg); }

/* ── Responsive ── */
@media (max-width: 700px) {
  .qs-landing-grid { grid-template-columns: 1fr; }
  .qs-summary-bar { flex-direction: column; align-items: flex-start; }
  .qs-summary-meter { margin-left: 0; min-width: 100%; }
  .qs-tab-btn { font-size: 12px; padding: 7px 10px; gap: 5px; }
  .qs-norm-ref-grid { grid-template-columns: 1fr; }
}

/* =============================================================
   HOMEPAGE – NEU (v4 Hero + Main Grid)
   ============================================================= */

.page-home { padding: 0; }

/* ── Hero ── */
.home-hero {
  position: relative; overflow: hidden;
  padding: 60px 24px 50px;
  background: linear-gradient(135deg, var(--bg-base) 0%, #0d1f3a 50%, var(--bg-base) 100%);
  text-align: center;
}
.hero-bg-grid {
  position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(30,90,200,.07) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(30,90,200,.07) 1px, transparent 1px);
  background-size: 48px 48px;
}
.home-hero-content { position: relative; z-index: 1; max-width: 700px; margin: 0 auto; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(59,130,246,.15); border: 1px solid rgba(59,130,246,.3);
  color: #93c5fd; border-radius: 20px; padding: 5px 14px; font-size: 12px; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase; margin-bottom: 20px;
}
.hero-badge-dot { width: 6px; height: 6px; border-radius: 50%; background: #3b82f6; }
.hero-title {
  font-size: clamp(2.4rem, 7vw, 4.2rem); font-weight: 900;
  letter-spacing: .04em; color: var(--text-primary); margin: 0 0 12px;
  line-height: 1;
}
.hero-title-accent { color: var(--accent); }
.hero-subtitle {
  font-size: 16px; color: var(--text-secondary); margin: 0 0 28px;
  max-width: 500px; margin-left: auto; margin-right: auto;
}
.hero-stats { display: flex; justify-content: center; gap: 32px; flex-wrap: wrap; }
.stat-item { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.stat-value { font-size: 22px; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 11px; color: var(--gray-400); text-transform: uppercase; letter-spacing: .06em; }

/* ── Main Card Grid ── */
.home-main-grid-wrap { padding: 36px 24px 48px; max-width: 1100px; margin: 0 auto; }
.home-main-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.home-main-card {
  position: relative; overflow: hidden;
  background: var(--bg-elevated); border: 1.5px solid var(--gray-700);
  border-radius: var(--radius-lg); padding: 28px 24px 22px;
  cursor: pointer; text-align: left;
  transition: transform .18s ease, border-color .18s, box-shadow .18s;
  display: flex; flex-direction: column; gap: 0;
}
.home-main-card:hover {
  transform: translateY(-3px); box-shadow: var(--shadow-lg);
}
.home-card-icon-wrap {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; margin-bottom: 16px; flex-shrink: 0;
}
.home-card-body { flex: 1; }
.home-card-title { font-size: 18px; font-weight: 700; color: var(--text-primary); margin: 0 0 6px; }
.home-card-desc  { font-size: 13.5px; color: var(--text-secondary); margin: 0 0 14px; line-height: 1.5; }
.home-card-tags  { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.home-card-tag   { font-size: 11px; padding: 3px 8px; border-radius: 5px; font-weight: 500; }
.home-card-btn   {
  margin-top: auto; display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 600; padding: 8px 16px; border-radius: 8px;
  border: none; cursor: pointer; transition: opacity .15s;
}
.home-card-btn:hover { opacity: .85; }
.home-card-arrow { font-size: 16px; }

/* Normteile – blau */
.home-card-normteile { border-color: #1e3a5f; }
.home-card-normteile:hover { border-color: #3b82f6; }
.home-card-normteile .home-card-icon-wrap { background: rgba(59,130,246,.15); }
.home-card-normteile .home-card-tag { background: rgba(59,130,246,.12); color: #93c5fd; }
.home-card-normteile .home-card-btn  { background: #3b82f6; color: #fff; }

/* Berechnungen – orange */
.home-card-calc { border-color: #3d2000; }
.home-card-calc:hover { border-color: #f97316; }
.home-card-calc .home-card-icon-wrap { background: rgba(249,115,22,.15); }
.home-card-calc .home-card-tag  { background: rgba(249,115,22,.12); color: #fdba74; }
.home-card-calc .home-card-btn  { background: #f97316; color: #fff; }

/* CAM/CNC – zyan */
.home-card-cam { border-color: #0c3040; }
.home-card-cam:hover { border-color: #06b6d4; }
.home-card-cam .home-card-icon-wrap { background: rgba(6,182,212,.15); }
.home-card-cam .home-card-tag  { background: rgba(6,182,212,.12); color: #67e8f9; }
.home-card-cam .home-card-btn  { background: #06b6d4; color: #fff; }

/* QS – grün */
.home-card-qs { border-color: var(--qs-color-dim); }
.home-card-qs:hover { border-color: var(--qs-color); }
.home-card-qs .home-card-icon-wrap { background: var(--qs-bg); }
.home-card-qs .home-card-tag  { background: var(--qs-ok-bg); color: var(--qs-ok); }
.home-card-qs .home-card-btn  { background: var(--qs-color); color: #fff; }

/* Lerncenter – lila */
.home-card-learn { border-color: #2e1a4f; }
.home-card-learn:hover { border-color: #a855f7; }
.home-card-learn .home-card-icon-wrap { background: rgba(168,85,247,.15); }
.home-card-learn .home-card-tag  { background: rgba(168,85,247,.12); color: #c084fc; }
.home-card-learn .home-card-btn  { background: #a855f7; color: #fff; }

/* =============================================================
   NORMTEILE – Sub-Landing
   ============================================================= */

.sub-landing-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: 16px;
}
.sub-landing-card {
  background: var(--bg-elevated); border: 1.5px solid var(--gray-700);
  border-radius: var(--radius-md); padding: 20px;
  cursor: pointer; text-align: left; transition: border-color .15s, background .15s;
  display: flex; flex-direction: column; gap: 10px;
}
.sub-landing-card:hover { border-color: #3b82f6; background: rgba(59,130,246,.06); }
.sub-landing-icon { font-size: 28px; }
.sub-landing-title { font-size: 15px; font-weight: 700; color: var(--text-primary); }
.sub-landing-norm  { font-size: 12px; color: var(--gray-400); }
.sub-landing-open  {
  margin-top: 4px; font-size: 12px; font-weight: 600; color: #3b82f6;
  display: flex; align-items: center; gap: 4px;
}

.future-modules-box {
  margin-top: 28px; background: var(--bg-elevated); border: 1px solid var(--gray-700);
  border-radius: var(--radius-md); padding: 18px 20px;
}
.future-modules-label {
  font-size: 12px; font-weight: 700; color: var(--gray-400);
  text-transform: uppercase; letter-spacing: .07em; margin-bottom: 12px;
}
.future-modules-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.future-modules-tags span {
  font-size: 12px; color: var(--gray-400); background: var(--bg-base);
  border: 1px solid var(--gray-600); border-radius: 6px; padding: 4px 10px;
}

/* =============================================================
   BERECHNUNGEN – Landing + Panels
   ============================================================= */

.calc-section-header {
  font-size: 11px; font-weight: 700; color: var(--gray-400);
  text-transform: uppercase; letter-spacing: .08em;
  margin: 28px 0 12px; padding-bottom: 6px;
  border-bottom: 1px solid var(--gray-700);
}
.calc-section-header:first-child { margin-top: 0; }

.calc-card-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px;
  margin-bottom: 4px;
}
.calc-card {
  background: var(--bg-elevated); border: 1.5px solid var(--gray-700);
  border-radius: var(--radius-md); padding: 16px 16px 14px;
  cursor: pointer; text-align: left; transition: border-color .15s, background .15s;
  display: flex; align-items: flex-start; gap: 12px;
}
.calc-card:hover { border-color: #f97316; background: rgba(249,115,22,.06); }
.calc-card-icon  { font-size: 22px; flex-shrink: 0; margin-top: 2px; }
.calc-card-body  { flex: 1; }
.calc-card-title { font-size: 14px; font-weight: 700; color: var(--text-primary); margin: 0 0 3px; }
.calc-card-norm  { font-size: 11.5px; color: var(--gray-400); margin: 0; }

.calc-springcalc-link {
  display: flex; align-items: center; gap: 12px;
  background: rgba(34,197,94,.07); border: 1px solid rgba(34,197,94,.2);
  border-radius: var(--radius-md); padding: 14px 18px; margin-top: 24px;
  cursor: pointer; text-decoration: none; transition: background .15s;
}
.calc-springcalc-link:hover { background: rgba(34,197,94,.14); }
.calc-springcalc-icon { font-size: 24px; }
.calc-springcalc-text { flex: 1; }
.calc-springcalc-text strong { color: var(--qs-ok); display: block; font-size: 14px; }
.calc-springcalc-text span { color: var(--gray-400); font-size: 12.5px; }

/* ── Active panel header ── */
.calc-back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: none; border: none; color: var(--gray-400);
  font-size: 13px; cursor: pointer; padding: 0 0 20px;
  transition: color .15s;
}
.calc-back-btn:hover { color: var(--text-primary); }

.calc-panel {}
.calc-panel-title {
  font-size: 20px; font-weight: 800; color: var(--text-primary); margin: 0 0 4px;
}
.calc-norm-ref {
  font-size: 12px; color: var(--gray-400); margin: 0 0 20px;
  display: flex; align-items: center; gap: 6px;
}
.calc-norm-ref::before { content: '📐'; }

/* ── Form grid ── */
.calc-form-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px; margin-bottom: 4px;
}
.calc-form-group { display: flex; flex-direction: column; gap: 5px; }
.calc-form-group label { font-size: 12.5px; color: var(--gray-300); font-weight: 600; }
.calc-form-group input, .calc-form-group select {
  background: var(--bg-base); border: 1px solid var(--gray-600);
  color: var(--text-primary); border-radius: 7px; padding: 9px 12px;
  font-size: 14px; transition: border-color .15s;
}
.calc-form-group input:focus, .calc-form-group select:focus {
  outline: none; border-color: #f97316;
}
.calc-hint {
  font-size: 11.5px; color: var(--gray-500); margin: 2px 0 0;
}

.calc-calc-btn {
  margin-top: 20px; background: #f97316; color: #fff;
  border: none; border-radius: 8px; padding: 11px 24px;
  font-size: 14px; font-weight: 700; cursor: pointer;
  transition: opacity .15s;
}
.calc-calc-btn:hover { opacity: .85; }

/* ── Result box ── */
.calc-result-box {
  margin-top: 22px; background: rgba(249,115,22,.07);
  border: 1px solid rgba(249,115,22,.25); border-radius: var(--radius-md);
  padding: 18px 20px;
}
.calc-result-title {
  font-size: 12px; font-weight: 700; color: #fdba74;
  text-transform: uppercase; letter-spacing: .07em; margin: 0 0 14px;
}
.calc-result-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px;
}
.calc-result-item { display: flex; flex-direction: column; gap: 3px; }
.calc-result-label { font-size: 11.5px; color: var(--gray-400); }
.calc-result-value { font-size: 20px; font-weight: 800; color: var(--text-primary); }
.calc-result-unit  { font-size: 11px; color: var(--gray-500); }
.calc-result-highlight .calc-result-value { color: #f97316; }

.calc-formula-box {
  margin-top: 16px; background: var(--bg-base); border: 1px solid var(--gray-700);
  border-radius: var(--radius-sm); padding: 10px 14px;
  font-family: 'Courier New', monospace; font-size: 13px; color: var(--gray-300);
}

/* ── Fit-Passung result ── */
.fit-type-badge {
  display: inline-block; padding: 3px 12px; border-radius: 6px;
  font-size: 13px; font-weight: 700; margin-bottom: 12px;
  background: rgba(249,115,22,.15); color: #fdba74;
}

/* =============================================================
   NAVIGATION – Neue Dropdown-Styles
   ============================================================= */

.nav-link-dd { display: flex; align-items: center; gap: 5px; }
.nav-link-calc { color: #fdba74; }
.nav-link-learn { color: #c084fc; }
.nav-link-cam { color: #67e8f9; }
.nav-link-fav { color: var(--gray-400); }

.nav-dropdown-wide { min-width: 280px !important; }
.nav-dropdown-section-label {
  padding: 10px 16px 4px; font-size: 10.5px; font-weight: 700;
  color: var(--gray-500); text-transform: uppercase; letter-spacing: .08em;
}

/* =============================================================
   LERNCENTER – Stats + Kategorie-Grid
   ============================================================= */

.learn-stats-bar {
  display: flex; gap: 24px; flex-wrap: wrap;
  background: var(--bg-elevated); border: 1px solid var(--gray-700);
  border-radius: var(--radius-md); padding: 18px 22px; margin-bottom: 28px;
}
.learn-stat { display: flex; flex-direction: column; gap: 2px; }
.learn-stat-num { font-size: 22px; font-weight: 800; color: #a855f7; }
.learn-stat-lbl { font-size: 11px; color: var(--gray-400); text-transform: uppercase; letter-spacing: .06em; }

.learn-cat-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px;
}
.learn-cat-card {
  background: var(--bg-elevated); border: 1.5px solid var(--gray-700);
  border-radius: var(--radius-md); padding: 18px 16px;
  cursor: pointer; text-align: left; transition: border-color .15s, background .15s;
  display: flex; flex-direction: column; gap: 8px;
}
.learn-cat-card:hover { border-color: #a855f7; background: rgba(168,85,247,.07); }
.learn-cat-all { border-color: rgba(168,85,247,.3); }
.learn-cat-all:hover { border-color: #a855f7; }
.learn-cat-icon  { font-size: 26px; }
.learn-cat-title { font-size: 14px; font-weight: 700; color: var(--text-primary); margin: 0; }
.learn-cat-count { font-size: 12px; color: var(--gray-400); margin: 0; }

/* =============================================================
   LERNCENTER – Quiz
   ============================================================= */

/* ── Quiz Header ── */
.quiz-header {
  display: flex; align-items: center; gap: 12px; margin-bottom: 20px; flex-wrap: wrap;
}
.quiz-back-btn {
  background: none; border: none; color: var(--gray-400);
  font-size: 13px; cursor: pointer; padding: 0;
  transition: color .15s; display: flex; align-items: center; gap: 5px;
}
.quiz-back-btn:hover { color: var(--text-primary); }
.quiz-progress-wrap {
  flex: 1; display: flex; flex-direction: column; gap: 4px; min-width: 120px;
}
.quiz-progress-bar {
  height: 6px; background: var(--gray-700); border-radius: 3px; overflow: hidden;
}
.quiz-progress-fill {
  height: 100%; background: #a855f7; border-radius: 3px; transition: width .3s ease;
  width: 0%;
}
.quiz-progress-label { font-size: 11.5px; color: var(--gray-400); }
.quiz-score-chip {
  background: rgba(168,85,247,.15); color: #c084fc; border: 1px solid rgba(168,85,247,.3);
  border-radius: 20px; padding: 4px 12px; font-size: 13px; font-weight: 700;
  white-space: nowrap;
}

/* ── Quiz Card ── */
.quiz-card {
  background: var(--bg-elevated); border: 1.5px solid var(--gray-700);
  border-radius: var(--radius-lg); padding: 24px;
}
.quiz-cat-label {
  font-size: 11px; font-weight: 700; color: #a855f7;
  text-transform: uppercase; letter-spacing: .07em; margin-bottom: 12px;
}
.quiz-question {
  font-size: 17px; font-weight: 700; color: var(--text-primary);
  margin: 0 0 20px; line-height: 1.45;
}
.quiz-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 18px; }
.quiz-option-btn {
  background: var(--bg-base); border: 1.5px solid var(--gray-700);
  color: var(--text-primary); border-radius: 10px; padding: 12px 16px;
  font-size: 14px; text-align: left; cursor: pointer;
  transition: border-color .15s, background .15s;
}
.quiz-option-btn:hover:not(:disabled) { border-color: #a855f7; background: rgba(168,85,247,.07); }
.quiz-option-btn.selected { border-color: #a855f7; background: rgba(168,85,247,.12); }
.quiz-option-btn.correct  { border-color: var(--qs-ok); background: var(--qs-ok-bg); color: var(--qs-ok); }
.quiz-option-btn.wrong    { border-color: var(--qs-err,#ef4444); background: rgba(239,68,68,.1); color: #f87171; }

.quiz-check-btn {
  background: #a855f7; color: #fff; border: none;
  border-radius: 8px; padding: 11px 24px; font-size: 14px; font-weight: 700;
  cursor: pointer; transition: opacity .15s; margin-right: 10px;
}
.quiz-check-btn:hover { opacity: .85; }
.quiz-next-btn {
  background: rgba(168,85,247,.15); color: #c084fc;
  border: 1px solid rgba(168,85,247,.3); border-radius: 8px;
  padding: 11px 24px; font-size: 14px; font-weight: 700;
  cursor: pointer; transition: background .15s;
}
.quiz-next-btn:hover { background: rgba(168,85,247,.25); }

/* ── Explanation ── */
.quiz-explanation {
  margin-top: 16px; background: var(--bg-base);
  border: 1px solid var(--gray-700); border-radius: 10px; padding: 16px;
}
.quiz-exp-header { font-size: 14px; font-weight: 700; margin: 0 0 8px; }
.quiz-exp-text   { font-size: 13.5px; color: var(--text-secondary); margin: 0 0 8px; line-height: 1.5; }
.quiz-exp-source { font-size: 12px; color: var(--gray-500); }

/* ── Result ── */
.quiz-result-card {
  background: var(--bg-elevated); border: 1.5px solid rgba(168,85,247,.3);
  border-radius: var(--radius-lg); padding: 40px 28px; text-align: center;
  max-width: 480px; margin: 0 auto;
}
.quiz-result-icon  { font-size: 56px; margin-bottom: 12px; }
.quiz-result-title { font-size: 18px; font-weight: 800; color: var(--text-primary); margin: 0 0 16px; }
.quiz-result-score {
  display: flex; align-items: baseline; justify-content: center; gap: 4px;
  margin-bottom: 4px;
}
.quiz-result-num   { font-size: 48px; font-weight: 900; color: #a855f7; line-height: 1; }
.quiz-result-total { font-size: 22px; color: var(--gray-400); }
.quiz-result-pct   { font-size: 20px; font-weight: 800; color: #c084fc; margin-bottom: 12px; }
.quiz-result-msg   { font-size: 15px; color: var(--text-secondary); margin-bottom: 24px; }
.quiz-result-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.quiz-retry-btn {
  background: #a855f7; color: #fff; border: none;
  border-radius: 8px; padding: 11px 24px; font-size: 14px; font-weight: 700;
  cursor: pointer; transition: opacity .15s;
}
.quiz-retry-btn:hover { opacity: .85; }
.quiz-other-btn {
  background: var(--bg-base); color: var(--text-secondary);
  border: 1px solid var(--gray-600); border-radius: 8px;
  padding: 11px 20px; font-size: 14px; cursor: pointer; transition: background .15s;
}
.quiz-other-btn:hover { background: var(--bg-hover); }

/* =============================================================
   RESPONSIVE – neue Bereiche
   ============================================================= */

@media (max-width: 700px) {
  .home-hero { padding: 40px 16px 36px; }
  .hero-stats { gap: 20px; }
  .home-main-grid-wrap { padding: 24px 14px 36px; }
  .home-main-grid { gap: 14px; }
  .home-main-card { padding: 20px 18px 16px; }
  .calc-form-grid { grid-template-columns: 1fr; }
  .calc-result-grid { grid-template-columns: 1fr 1fr; }
  .learn-cat-grid { grid-template-columns: 1fr 1fr; }
  .quiz-header { flex-wrap: wrap; }
  .quiz-result-card { padding: 28px 18px; }
  .quiz-result-num { font-size: 36px; }
}
@media (max-width: 480px) {
  .learn-cat-grid { grid-template-columns: 1fr; }
  .calc-result-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 2rem; }
}

/* =============================================================
   LOGIN OVERLAY
   ============================================================= */

.login-overlay {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse at 50% 0%, #0d1a36 0%, #0a0d14 70%);
  overflow-y: auto; padding: 24px 16px;
}
.login-overlay.hidden { display: none; }

/* ── Background grid matching the hero ── */
.login-overlay::before {
  content: '';
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(30,90,200,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,90,200,.06) 1px, transparent 1px);
  background-size: 52px 52px;
}

.login-card {
  position: relative; z-index: 1;
  background: var(--bg-elevated);
  border: 1px solid var(--gray-700);
  border-radius: 20px;
  padding: 40px 36px;
  width: 100%; max-width: 420px;
  box-shadow: 0 24px 64px rgba(0,0,0,.7);
}

/* ── Logo ── */
.login-logo {
  display: flex; align-items: center; justify-content: center;
  gap: 12px; margin-bottom: 8px;
}
.login-logo-icon { width: 40px; height: 40px; flex-shrink: 0; }
.login-logo-text {
  font-size: 22px; font-weight: 900; letter-spacing: .06em; color: var(--text-primary);
}
.login-logo-accent { color: var(--accent); }
.login-subtitle {
  text-align: center; font-size: 13px; color: var(--gray-400);
  margin: 0 0 28px;
}

/* ── OAuth Buttons ── */
.login-oauth-group {
  display: flex; flex-direction: column; gap: 10px; margin-bottom: 4px;
}
.login-oauth-btn {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; padding: 11px 16px; border-radius: var(--radius-md);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: opacity .15s, transform .1s;
  border: 1.5px solid transparent;
}
.login-oauth-btn:hover { opacity: .88; transform: translateY(-1px); }
.login-oauth-btn:active { transform: translateY(0); }

.login-google {
  background: #fff; color: #1f2937;
  border-color: #e5e7eb;
}
.login-google:hover { background: #f9fafb; }

.login-apple {
  background: #fff; color: #1f2937;
  border-color: #e5e7eb;
}
.login-apple:hover { background: #f9fafb; }

.login-microsoft {
  background: var(--bg-base); color: var(--text-primary);
  border-color: var(--gray-600);
}
.login-microsoft:hover { background: var(--bg-hover); }

/* ── Divider ── */
.login-divider {
  display: flex; align-items: center; gap: 12px;
  margin: 20px 0 18px; color: var(--gray-500); font-size: 12px;
}
.login-divider::before, .login-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--gray-700);
}

/* ── Email Form ── */
.login-email-form { display: flex; flex-direction: column; gap: 10px; }
.login-input {
  width: 100%; padding: 11px 14px; border-radius: var(--radius-md);
  background: var(--bg-base); border: 1.5px solid var(--gray-600);
  color: var(--text-primary); font-size: 14px;
  transition: border-color .15s;
  box-sizing: border-box;
}
.login-input:focus { outline: none; border-color: var(--accent); }
.login-input::placeholder { color: var(--gray-500); }

.login-form-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 4px;
}
.login-primary-btn {
  padding: 11px; border-radius: var(--radius-md);
  background: var(--accent); color: #fff;
  border: none; font-size: 14px; font-weight: 700; cursor: pointer;
  transition: opacity .15s;
}
.login-primary-btn:hover { opacity: .88; }
.login-secondary-btn {
  padding: 11px; border-radius: var(--radius-md);
  background: transparent; color: var(--text-secondary);
  border: 1.5px solid var(--gray-600); font-size: 14px; font-weight: 600; cursor: pointer;
  transition: border-color .15s, color .15s;
}
.login-secondary-btn:hover { border-color: var(--accent); color: var(--accent); }
.login-forgot-btn {
  background: none; border: none; color: var(--gray-400);
  font-size: 12.5px; cursor: pointer; padding: 4px 0; text-align: center;
  transition: color .15s;
}
.login-forgot-btn:hover { color: var(--accent); }

/* ── Error ── */
.login-error {
  margin-top: 14px; padding: 10px 14px; border-radius: var(--radius-sm);
  background: var(--error-bg); border: 1px solid rgba(239,68,68,.3);
  color: #f87171; font-size: 13px; text-align: center;
}

/* ── Dev Notice ── */
.login-dev-notice {
  margin-top: 24px; padding: 16px; border-radius: var(--radius-md);
  background: rgba(245,158,11,.07); border: 1px solid rgba(245,158,11,.25);
  text-align: center;
}
.login-dev-icon { font-size: 22px; margin-bottom: 8px; }
.login-dev-notice p { font-size: 13px; color: var(--text-secondary); margin: 0 0 12px; line-height: 1.5; }
.login-dev-notice code { color: #fdba74; background: rgba(245,158,11,.1); padding: 1px 5px; border-radius: 4px; }
.login-dev-bypass {
  background: rgba(245,158,11,.15); color: #fdba74;
  border: 1px solid rgba(245,158,11,.3); border-radius: var(--radius-sm);
  padding: 8px 16px; font-size: 13px; font-weight: 600; cursor: pointer;
  transition: background .15s;
}
.login-dev-bypass:hover { background: rgba(245,158,11,.25); }

.login-legal {
  margin-top: 20px; text-align: center; font-size: 11px; color: var(--gray-500); margin-bottom: 0;
}

/* ── Spinner during auth check ── */
.login-spinner {
  width: 32px; height: 32px; border-radius: 50%;
  border: 3px solid var(--gray-700);
  border-top-color: var(--accent);
  animation: spin .7s linear infinite;
  margin: 0 auto 16px;
}

/* =============================================================
   NAV – User Avatar
   ============================================================= */

.nav-user {
  display: flex; align-items: center; gap: 8px; margin-left: 12px;
  flex-shrink: 0;
}
.nav-user-avatar {
  width: 30px; height: 30px; border-radius: 50%;
  border: 2px solid var(--gray-600); object-fit: cover;
  background: var(--bg-hover);
}
.nav-user-name {
  font-size: 13px; color: var(--text-secondary);
  max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  display: none; /* show on wider screens */
}
@media (min-width: 1000px) { .nav-user-name { display: block; } }

.nav-logout-btn {
  background: none; border: none; color: var(--gray-400);
  cursor: pointer; padding: 4px; border-radius: 6px;
  transition: color .15s, background .15s;
  display: flex; align-items: center;
}
.nav-logout-btn:hover { color: var(--error); background: var(--error-bg); }

/* =============================================================
   UI-VERBESSERUNGEN – Allgemein
   ============================================================= */

/* Besser sichtbare Focus-Ringe für Barrierefreiheit */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Sanftere Übergänge bei allen interaktiven Elementen */
button, a, input, select { transition-duration: .15s; }

/* Detail-Seiten: mehr Luft oben */
.page-detail { padding-top: 36px; }

/* Karten: einheitlichere Hover-Schatten */
.cat-card:hover, .spring-btn:hover { box-shadow: var(--shadow-md); }

/* Tabellen: zebra-Streifen für bessere Lesbarkeit */
.norm-table tbody tr:nth-child(even) td { background: rgba(255,255,255,.02); }

/* Section-Trennlinie für Detail-Seiten */
.page-detail .detail-header {
  border-bottom: 1px solid var(--gray-700);
  padding-bottom: 16px; margin-bottom: 28px;
}

/* Input-Felder: globale Verbesserung */
input[type="number"], input[type="text"], input[type="email"], input[type="password"], select {
  -webkit-appearance: none; appearance: none;
}

/* Spinner-Animation (allgemein) */
@keyframes spin { to { transform: rotate(360deg); } }

/* Loading-Overlay für STEP-Datei */
.step-loading-overlay {
  position: absolute; inset: 0; z-index: 10;
  background: rgba(10,13,20,.85); backdrop-filter: blur(4px);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border-radius: var(--radius-md); gap: 12px;
}
.step-loading-spinner {
  width: 40px; height: 40px; border-radius: 50%;
  border: 3px solid var(--gray-700); border-top-color: #06b6d4;
  animation: spin .8s linear infinite;
}
.step-loading-text { font-size: 14px; color: var(--text-secondary); }
.step-loading-sub  { font-size: 12px; color: var(--gray-500); }

@media (max-width: 480px) {
  .login-card { padding: 28px 20px; }
  .login-form-row { grid-template-columns: 1fr; }
  .nav-user-avatar { width: 26px; height: 26px; }
}

/* =============================================================
   UI-REFINEMENTS v4 – Klareres, aufgeräumteres Design
   ============================================================= */

/* ── Globale Typographie-Verbesserungen ── */
body { font-feature-settings: "kern" 1, "liga" 1; }

/* ── Klarere Heading-Hierarchie auf Detailseiten ── */
.detail-title { font-size: clamp(20px, 3vw, 26px); font-weight: 800; }

/* ── Norm-Badges: einheitlich + kompakter ── */
.norm-badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 11px; font-weight: 600; letter-spacing: .04em;
  padding: 3px 8px; border-radius: 5px;
  background: var(--accent-light); color: #93c5fd;
  border: 1px solid rgba(59,130,246,.2);
  white-space: nowrap;
}

/* ── Tabellen: schönere Zellen ── */
.norm-table th {
  font-size: 11px; letter-spacing: .06em; text-transform: uppercase;
  color: var(--gray-400); padding: 8px 10px; background: var(--bg-base);
}
.norm-table td { padding: 7px 10px; font-size: 13px; }
.norm-table td:first-child { font-weight: 600; color: var(--text-primary); }

/* ── Bessere Buttons ── */
.btn { border-radius: var(--radius-md); font-weight: 600; }
.btn-primary {
  background: var(--accent); color: #fff; border: none;
  padding: 10px 20px; cursor: pointer;
  transition: opacity .15s, transform .1s;
}
.btn-primary:hover { opacity: .88; transform: translateY(-1px); }
.btn-ghost {
  background: transparent; color: var(--text-secondary);
  border: 1.5px solid var(--gray-600);
  padding: 10px 20px; cursor: pointer; transition: border-color .15s, color .15s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ── Karten-Hover: subtiler Glow statt nur Border ── */
.home-main-card:hover { box-shadow: 0 8px 40px rgba(0,0,0,.5), 0 0 0 1px rgba(255,255,255,.04); }

/* ── Home Statbar: größerer Abstand ── */
.hero-stats { margin-top: 8px; }
.stat-item { min-width: 80px; }

/* ── Breadcrumbs: besser sichtbar ── */
.page-breadcrumb { margin-bottom: 4px; }

/* ── Detail-Card: leicht transparenter Hintergrund ── */
.detail-card {
  background: var(--bg-elevated);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: 20px;
}
.detail-card + .detail-card { margin-top: 16px; }

/* ── Nav: aktivem Link mehr Kontrast ── */
.nav-link.active {
  color: var(--text-primary);
  background: rgba(59,130,246,.1);
  font-weight: 600;
}

/* ── Nav-Dropdown: sanftere Animierung ── */
.nav-dropdown-menu {
  animation: dropdownFadeIn .12s ease;
}
@keyframes dropdownFadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Verbesserter Footer ── */
.site-footer {
  border-top: 1px solid var(--gray-700);
  padding: 16px 24px;
  text-align: center;
  font-size: 12px;
  color: var(--gray-500);
  background: var(--bg-base);
}

/* ── STEP-Viewer: bessere Zustandsmeldungen ── */
.viewer-badge {
  position: absolute; top: 10px; left: 12px; z-index: 5;
  background: rgba(10,13,20,.75); backdrop-filter: blur(4px);
  border: 1px solid var(--gray-700); border-radius: 6px;
  font-size: 11px; color: var(--gray-300); padding: 4px 10px;
  pointer-events: none;
}
.viewer-badge-occt { border-color: rgba(6,182,212,.3); color: #67e8f9; }

/* ── Calc-Panels: bessere Label-Lesbarkeit ── */
.calc-form-group label {
  font-size: 12px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .04em; color: var(--gray-400);
}

/* ── Quiz: klarer markierte richtige Antworten ── */
.quiz-option-btn.correct { font-weight: 700; }
.quiz-option-btn.wrong   { opacity: .7; }

/* ── Scrollbar: dezente Dark-Mode-Scrollbar ── */
::-webkit-scrollbar       { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--gray-600); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-500); }

/* ── Responsive: Mobile touch-friendly ── */
@media (max-width: 700px) {
  .page-inner { padding: 20px 14px 48px; }
  .detail-card { padding: 14px; }
  .btn-primary, .btn-ghost { padding: 11px 16px; font-size: 14px; }
  .home-main-card { padding: 18px 14px; }
  .login-oauth-btn { font-size: 13px; padding: 10px 12px; }
}