OPEN SOURCE UNTERSEITE – Eigene Klassen (Prefix: os-)
   Keine Konflikte mit bestehenden Klassen.
   ══════════════════════════════════════════════════════════════ */

/* ── HERO ── */
.os-hero {
  background: linear-gradient(135deg, #8ea4c8 0%, #c9b8a0 40%, #f0d070 75%, #f9db80 100%);
  color: #2a2a2a;
  margin-top: 70px;
  padding: 5rem 2rem 4rem;
  text-align: left;
  position: relative;
  overflow: visible;
  z-index: 1;
  box-shadow: 0 10px 30px rgba(0,0,0,0.18) !important;
}

.os-hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: radial-gradient(ellipse at 30% 50%, rgba(242,184,2,0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 20%, rgba(255,255,255,0.05) 0%, transparent 50%);
  pointer-events: none;
}
.os-hero h1 {
  font-family: BarlowBold, Barlow, sans-serif;
  font-size: clamp(2rem, 4.5vw, 3rem);
  margin-bottom: 1rem;
  position: relative;
}
.os-hero p {
  font-size: 1.15rem;
  max-width: 720px;
  margin: 0 0 2rem;
  opacity: 0.8;
  position: relative;
  line-height: 1.8;
}
.os-badge {
  display: inline-block;
  background: #7f8c9f;
  color: #fff;
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 0.4rem 1.2rem;
  border-radius: 50px;
  margin-bottom: 1.4rem;
  position: relative;
}

/* ── CONTAINER ── */
.os-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── SECTIONS ── */
.os-section {
  padding: 4rem 0;
}
.os-section--alt {
  background: #f5f7fa;
}
.os-section h2 {
  font-family: BarlowBold, Barlow, sans-serif;
  font-size: 1.7rem;
  color: #1e3d6f;
  margin-bottom: 0.6rem;
}
.os-section h3 {
  font-size: 1.2rem;
  color: #2b5797;
  margin-bottom: 0.5rem;
  font-weight: 600;
}
.os-section-subtitle {
  font-size: 1.05rem;
  color: #666;
  margin-bottom: 2.5rem;
  max-width: 700px;
}

/* ── CARD GRID ── */
.os-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.8rem;
  margin-top: 2rem;
}
.os-card {
  background: #fff;
  border: 1px solid #dde3eb;
  border-radius: 8px;
  padding: 2rem;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  transition: transform 0.25s, box-shadow 0.25s;
}
.os-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 28px rgba(0,0,0,0.10);
}
.os-card-icon {
  font-size: 2.4rem;
  margin-bottom: 1rem;
  display: block;
}
.os-card h3 {
  margin-bottom: 0.7rem;
}
.os-card p {
  color: #666;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ── COMPARISON TABLE ── */
.os-comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 2rem;
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}
.os-comparison-table th {
  background: #2b5797;
  color: #fff;
  text-align: left;
  padding: 1rem 1.4rem;
  font-weight: 600;
  font-size: 0.95rem;
}
.os-comparison-table td {
  padding: 0.9rem 1.4rem;
  border-bottom: 1px solid #dde3eb;
  font-size: 0.93rem;
  vertical-align: top;
}
.os-comparison-table tr:last-child td { border-bottom: none; }
.os-comparison-table tr:nth-child(even) td { background: #f5f7fa; }
.os-check { color: #4CAF50; font-weight: 700; font-size: 1.1rem; }
.os-cross { color: #c62828; font-weight: 700; font-size: 1.1rem; }

/* ── BENEFITS ROW ── */
.os-benefits-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.os-benefit-item {
  text-align: center;
  padding: 2rem 1.2rem;
  background: #fff;
  border-radius: 8px;
  border: 1px solid #dde3eb;
}
.os-benefit-number {
  font-family: BarlowBold, Barlow, sans-serif;
  font-size: 2.4rem;
  color: #2b5797;
  font-weight: 700;
}
.os-benefit-label {
  font-size: 0.9rem;
  color: #666;
  margin-top: 0.3rem;
}

/* ── STACK LIST ── */
.os-stack-section { margin-top: 2rem; }
.os-stack-item {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid #dde3eb;
}
.os-stack-item:last-child { border-bottom: none; }
.os-stack-icon {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  border-radius: 10px;
  background: #eef2f7;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}
.os-stack-item h3 { margin-bottom: 0.3rem; font-size: 1.05rem; }
.os-stack-item p { color: #666; font-size: 0.93rem; }

/* ── CTA ── */
.os-cta-section {
  background: linear-gradient(135deg, #8ea4c8 0%, #c9b8a0 40%, #f0d070 75%, #f9db80 100%);
  color: #2a2a2a;
  padding: 4rem 2rem;
  text-align: center;
  position: relative;
  z-index: 1;
  box-shadow: 0 -10px 30px rgba(0,0,0,0.12);
}
.os-cta-section h2 {
  color: #2a2a2a;
  font-family: BarlowBold, Barlow, sans-serif;
  font-size: 1.8rem;
  margin-bottom: 1rem;
}
.os-cta-section p {
  opacity: 0.85;
  max-width: 600px;
  margin: 0 auto 2rem;
  font-size: 1.05rem;
}
.os-cta-button {
  display: inline-block;
  background: #7f8c9f;
  color: #fff;
  padding: 0.9rem 2.4rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  border-radius: 50px;
  transition: background 0.2s, transform 0.2s;
}
.os-cta-button:hover {
  background: #6b7a8d;
  transform: translateY(-2px);
}
.os-cta-contact {
  margin-top: 1.4rem;
  font-size: 0.95rem;
  opacity: 0.75;
}
.os-cta-contact a { color: #2a2a2a; text-decoration: underline; }

/* ── FAQ (Open Source Seite) ── */
.os-faq-item {
  border-bottom: 1px solid #dde3eb;
  padding: 1.4rem 0;
}
.os-faq-item:last-child { border-bottom: none; }
.os-faq-question {
  font-weight: 700;
  font-size: 1.05rem;
  color: #1e3d6f;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.os-faq-question::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 300;
  color: #2b5797;
  transition: transform 0.3s;
}
.os-faq-item.open .os-faq-question::after {
  transform: rotate(45deg);
}
.os-faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  color: #666;
  font-size: 0.95rem;
  line-height: 1.7;
}
.os-faq-item.open .os-faq-answer {
  max-height: 300px;
  padding-top: 0.8rem;
}

/* ── RESPONSIVE (Open Source) ── */
@media (max-width: 768px) {
  .os-hero { padding: 6rem 1.5rem 3rem; }
  .os-card-grid { grid-template-columns: 1fr; }
  .os-benefits-row { grid-template-columns: 1fr 1fr; }
  .os-comparison-table { font-size: 0.85rem; }
  .os-comparison-table th,
  .os-comparison-table td { padding: 0.7rem 0.8rem; }
}

/* ── NAV & FOOTER Platzhalter (Open Source Seite) ── */
.os-nav-brand {
  font-family: BarlowBold, Barlow, sans-serif;
  font-size: 1.4rem;
  color: #2b5797;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.5px;
}
.os-nav-links { display: flex; gap: 1.6rem; align-items: center; flex-wrap: wrap; }
.os-nav-links a {
  text-decoration: none;
  color: #333;
  font-size: 0.92rem;
  font-weight: 600;
  transition: color 0.2s;
}
.os-nav-links a:hover { color: #2b5797; }
.os-nav-links a.active { color: #2b5797; border-bottom: 2px solid #2b5797; padding-bottom: 2px; }

.os-footer-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
}
.os-footer-grid a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: color 0.2s;
}
.os-footer-grid a:hover { color: #fff; }
.os-footer-col h4 {
  color: #fff;
  font-size: 0.92rem;
  margin-bottom: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.os-footer-col { display: flex; flex-direction: column; gap: 0.4rem; }
.os-footer-bottom {
  max-width: 1100px;
  margin: 2rem auto 0;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 0.82rem;
}


/* ══════════════════════════════════════════════════════════════
   KONTOR UNTERSEITEN – Gemeinsame Klassen (Prefix: kb-)
   Wiederverwendbar für alle neuen Unterseiten.
   ══════════════════════════════════════════════════════════════ */

/* ── HERO ── */
.kb-hero {
  background: linear-gradient(135deg, #8ea4c8 0%, #c9b8a0 40%, #f0d070 75%, #f9db80 100%);
  color: #2a2a2a;
  margin-top: 70px;
  padding: 5rem 2rem 4rem;
  text-align: left;
  position: relative;
  overflow: visible;
  z-index: 1;
  box-shadow: 0 10px 30px rgba(0,0,0,0.18);
}
.kb-hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: radial-gradient(ellipse at 30% 50%, rgba(242,184,2,0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 20%, rgba(255,255,255,0.05) 0%, transparent 50%);
  pointer-events: none;
}
.kb-hero h1 {
  font-family: BarlowBold, Barlow, sans-serif;
  font-size: clamp(2rem, 4.5vw, 3rem);
  margin-bottom: 1rem;
  position: relative;
}
.kb-hero p {
  font-size: 1.15rem;
  max-width: 720px;
  margin: 0 0 2rem;
  opacity: 0.8;
  position: relative;
  line-height: 1.8;
}

/* ── BADGE ── */
.kb-badge {
  display: inline-block;
  background: #7f8c9f;
  color: #fff;
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 0.4rem 1.2rem;
  border-radius: 50px;
  margin-bottom: 1.4rem;
  position: relative;
}

/* ── CONTAINER ── */
.kb-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── SECTIONS ── */
.kb-section {
  padding: 4rem 0;
}
.kb-section h2 {
  font-family: BarlowBold, Barlow, sans-serif;
  font-size: 1.7rem;
  color: #1e3d6f;
  margin-bottom: 0.6rem;
}
/* ── SEPARATOR ── */
.kb-seperator {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.2rem 0 1.5rem;
}
.kb-seperator-line {
  flex: 1;
  height: 1px;
  background: #dde3eb;
}
.kb-seperator img {
  width: 28px;
  height: auto;
  opacity: 0.6;
}

.kb-section-subtitle {
  font-size: 1.05rem;
  color: #666;
  margin-bottom: 2.5rem;
  max-width: 700px;
}

/* ── THESIS CARDS ── */
.kb-thesis-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}
.kb-thesis-card {
  background: #fff;
  border: 1px solid #dde3eb;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
  transition: transform 0.25s, box-shadow 0.25s;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}
.kb-thesis-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.13);
}
.kb-thesis-img {
  width: 100%;
  height: 220px;
  background-size: cover;
  background-position: center top;
  background-color: #eef2f7;
}
.kb-thesis-content {
  padding: 1.4rem 1.6rem 1.6rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.kb-thesis-date {
  font-size: 0.82rem;
  color: #999;
  margin-bottom: 0.3rem;
}
.kb-thesis-type {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #7f8c9f;
  background: rgba(127,140,159,0.1);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.7rem;
  align-self: flex-start;
}
.kb-thesis-card h3 {
  font-family: BarlowBold, Barlow, sans-serif;
  font-size: 1.05rem;
  color: #1e3d6f;
  line-height: 1.5;
  margin-bottom: 0.8rem;
  flex: 1;
}
.kb-thesis-author {
  font-size: 0.92rem;
  font-weight: 600;
  color: #f19e05;
}

/* ── CTA (Kontor allgemein) ── */
.kb-cta-section {
  background: linear-gradient(135deg, #8ea4c8 0%, #c9b8a0 40%, #f0d070 75%, #f9db80 100%);
  color: #2a2a2a;
  padding: 4rem 2rem;
  text-align: center;
  position: relative;
  z-index: 1;
  box-shadow: 0 -10px 30px rgba(0,0,0,0.12);
}
.kb-cta-section h2 {
  color: #2a2a2a;
  font-family: BarlowBold, Barlow, sans-serif;
  font-size: 1.8rem;
  margin-bottom: 1rem;
}
.kb-cta-section p {
  opacity: 0.85;
  max-width: 600px;
  margin: 0 auto 2rem;
  font-size: 1.05rem;
  line-height: 1.7;
}
.kb-cta-button {
  display: inline-block;
  background: #7f8c9f;
  color: #fff;
  padding: 0.9rem 2.4rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  border-radius: 50px;
  transition: background 0.2s, transform 0.2s;
}
.kb-cta-button:hover {
  background: #6b7a8d;
  transform: translateY(-2px);
}
.kb-cta-contact {
  margin-top: 1.4rem;
  font-size: 0.95rem;
  opacity: 0.75;
}
.kb-cta-contact a { color: #2a2a2a; text-decoration: underline; }

/* ── RESPONSIVE (kb-) ── */
@media (max-width: 768px) {
  .kb-hero { padding: 3.5rem 1.5rem 3rem; }
  .kb-thesis-grid { grid-template-columns: 1fr; }
}