/* ============================================
   Digitales & Bildung — Hauptstylesheet
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;700&family=Source+Sans+3:wght@300;400;600&display=swap');

:root {
  --color-primary: #01616E;
  --color-accent: #6E477B;
  --color-light: #EEF5F5;
  --color-white: #ffffff;
  --color-text: #201F1E;
  --color-text-light: #666;
  --color-border: #ddd;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Source Sans 3', 'Helvetica Neue', sans-serif;
  --max-width: 1100px;
  --nav-height: 80px;
  --transition: 0.3s ease;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.7;
  font-size: 17px;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---- Layout ---- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ============================================
   HEADER / NAV
   ============================================ */
header {
  background: var(--color-white);
  border-bottom: 2px solid var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.logo img {
  height: 52px;
  width: auto;
  border-radius: 4px;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-primary);
  font-weight: 700;
}

.logo-subtitle {
  font-size: 0.75rem;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
}

nav ul {
  display: flex;
  gap: 2rem;
  align-items: center;
}

nav a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.03em;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

nav a:hover,
nav a.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--color-primary);
  transition: transform var(--transition), opacity var(--transition);
}

/* ============================================
   HERO (Startseite)
   ============================================ */
.hero {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 5rem 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(110,71,123,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-tag {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.3rem 0.9rem;
  border-radius: 2px;
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  max-width: 650px;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.85;
  max-width: 520px;
  margin-bottom: 2rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 3px;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  transition: all var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  border: 2px solid var(--color-accent);
}

.btn-primary:hover {
  background: transparent;
  color: var(--color-accent);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 2px solid rgba(255,255,255,0.5);
  margin-left: 1rem;
}

.btn-outline:hover {
  border-color: var(--color-white);
  background: rgba(255,255,255,0.1);
}

/* ============================================
   CARDS / SECTION GRID
   ============================================ */
.section {
  padding: 4.5rem 0;
}

.section-light {
  background: var(--color-light);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.section-sub {
  color: var(--color-text-light);
  font-size: 1rem;
  margin-bottom: 2.5rem;
  max-width: 600px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.1);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-img-placeholder {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #006778 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-img-placeholder svg {
  width: 56px;
  height: 56px;
  opacity: 0.4;
  fill: white;
}

.card-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-body h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.card-body p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  flex: 1;
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  transition: gap var(--transition);
}

.card-link:hover { gap: 0.7rem; }

.card-link::after { content: '→'; }

/* ============================================
   PAGE HEADER (Unterseiten)
   ============================================ */
.page-header {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 3.5rem 0 2.5rem;
  position: relative;
  overflow: hidden;
}

.page-header::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 4px;
  background: var(--color-accent);
}

.page-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.page-header p {
  opacity: 0.8;
  font-size: 1.05rem;
  max-width: 600px;
}

/* ============================================
   BLOG
   ============================================ */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.blog-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 4px 4px 0;
  padding: 1.75rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.blog-card:hover {
  transform: translateX(4px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.blog-meta {
  font-size: 0.8rem;
  color: var(--color-text-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.blog-card h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.blog-card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ============================================
   LEISTUNGEN
   ============================================ */
.leistungen-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.leistung-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 2rem;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}

.leistung-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.09);
}

.leistung-item::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: var(--color-accent);
  border-radius: 4px 4px 0 0;
}

.leistung-icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.leistung-icon svg {
  width: 24px;
  height: 24px;
  fill: white;
  stroke: white;
}

.leistung-item h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-primary);
  margin-bottom: 0.6rem;
}

.leistung-item p {
  color: var(--color-text-light);
  font-size: 0.94rem;
  line-height: 1.65;
}

/* ============================================
   BILDUNGSINGENIEUR (Über uns)
   ============================================ */
.bio-section {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3.5rem;
  align-items: start;
}

.bio-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 2rem);
}

.bio-avatar {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 4px;
  border: 3px solid var(--color-primary);
}

.bio-avatar-placeholder {
  width: 100%;
  aspect-ratio: 1;
  background: var(--color-primary);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.bio-avatar-placeholder svg {
  width: 80px;
  height: 80px;
  fill: rgba(255,255,255,0.3);
}

.bio-name {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--color-primary);
  margin-top: 1rem;
}

.bio-role {
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.bio-content h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.bio-content p {
  margin-bottom: 1.25rem;
  color: var(--color-text);
  line-height: 1.8;
}

.bio-content p:first-of-type {
  font-size: 1.1rem;
  color: var(--color-primary);
  font-weight: 400;
}

/* ============================================
   BREADCRUMB
   ============================================ */
.breadcrumb {
  background: #EEF5F5;
  padding: 0.6rem 0;
  font-size: 0.82rem;
  color: var(--color-text-light);
}

.breadcrumb a {
  color: var(--color-primary);
  font-weight: 600;
}

.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb span { margin: 0 0.4rem; }

/* ============================================
   FOOTER
   ============================================ */
footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.75);
  padding: 2.5rem 0;
  margin-top: 4rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--color-white);
  font-weight: 700;
}

.footer-sub {
  font-size: 0.8rem;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--color-accent); }

.footer-copy {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  width: 100%;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255,255,255,0.1);
}

/* ============================================
   IMPRESSUM / DATENSCHUTZ
   ============================================ */
.prose-content {
  max-width: 760px;
}

.prose-content h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-primary);
  margin: 2rem 0 0.75rem;
}

.prose-content h2:first-child { margin-top: 0; }

.prose-content p,
.prose-content address {
  margin-bottom: 1rem;
  font-style: normal;
  line-height: 1.75;
  color: var(--color-text);
}

.prose-content a {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ============================================
   UTILITIES
   ============================================ */
.divider {
  height: 2px;
  background: linear-gradient(to right, var(--color-accent), transparent);
  margin: 2rem 0;
  border: none;
}

.text-accent { color: var(--color-accent); }
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 1rem; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  nav ul {
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--color-white);
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
    border-bottom: 2px solid var(--color-primary);
    transform: translateY(-120%);
    transition: transform var(--transition);
    z-index: 99;
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  }

  nav ul.open { transform: translateY(0); }

  nav ul li a {
    display: block;
    padding: 0.85rem 2rem;
    border-bottom: 1px solid var(--color-border);
    border-bottom-color: var(--color-border) !important;
  }

  .bio-section {
    grid-template-columns: 1fr;
  }

  .bio-sidebar { position: static; }

  .bio-avatar-placeholder,
  .bio-avatar {
    max-width: 220px;
  }

  .footer-inner { flex-direction: column; }

  .btn-outline { margin-left: 0; margin-top: 0.75rem; display: block; text-align: center; }

  .hero { padding: 3.5rem 0 3rem; }
}