/* ===== Google Fonts: Montserrat + Open Sans ===== */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700;800&family=Open+Sans:wght@400;500;600&display=swap');

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

:root {
  /* Artie Brand Colors */
  --navy:        #001F3F;
  --teal:        #00BF8F;
  --teal-dark:   #009970;
  --teal-light:  #e0faf3;
  --yellow:      #F7D700;
  --orange:      #FFB300;
  --orange-dark: #e09e00;
  --gray:        #ABA9A9;
  --gray-light:  #f4f4f4;
  --cream:       #FFFDD0;
  --white:       #ffffff;

  /* Semantic tokens */
  --color-bg:       #f5f7fa;
  --color-surface:  var(--white);
  --color-text:     #1a2332;
  --color-muted:    #6b7280;
  --color-border:   #e2e6ea;

  --radius:     10px;
  --radius-lg:  16px;
  --shadow-sm:  0 1px 4px rgba(0,31,63,.07);
  --shadow-md:  0 4px 16px rgba(0,31,63,.10);
  --shadow-lg:  0 8px 32px rgba(0,31,63,.13);
  --transition: .2s ease;
}

html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Open Sans', system-ui, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container { max-width: 1300px; margin: 0 auto; padding: 0 1.5rem; width: 100%; }

/* ===== Header ===== */
.site-header {
  background: var(--navy);
  color: var(--white);
  padding: 1.125rem 0;
  box-shadow: 0 2px 12px rgba(0,0,0,.25);
}
.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.header-brand { display: flex; align-items: center; gap: 0.875rem; }

.header-logo-img {
  height: 62px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 3px 8px rgba(0,0,0,.4));
}

.header-text { display: flex; flex-direction: column; }
.header-title {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
  line-height: 1.1;
}
.header-title span { color: var(--teal); }
.header-subtitle {
  font-family: 'Open Sans', sans-serif;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 0.1rem;
}

/* Language Toggle */
.lang-toggle {
  display: flex; align-items: center; gap: 0.25rem; flex-shrink: 0;
  background: rgba(255,255,255,.08);
  border-radius: 50px;
  padding: 0.2rem 0.25rem;
}
.lang-sep { display: none; }
.lang-btn {
  background: none;
  border: none;
  color: var(--gray);
  font-family: 'Montserrat', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.7rem;
  border-radius: 50px;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.05em;
}
.lang-btn:hover { color: var(--white); }
.lang-btn.active {
  color: var(--navy);
  background: var(--teal);
}

/* ===== Hero Search ===== */
.search-section {
  background: var(--navy);
  border-bottom: 3px solid var(--teal);
  padding: 2rem 0 2.25rem;
}
.search-section .container { text-align: center; }
.search-eyebrow {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 0.5rem;
}
.search-headline {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1.25rem;
}
.search-bar {
  position: relative;
  max-width: 680px;
  margin: 0 auto;
}
.search-icon {
  position: absolute; left: 1.125rem; top: 50%; transform: translateY(-50%);
  color: var(--gray); pointer-events: none;
}
.search-bar input {
  width: 100%;
  padding: 0.9375rem 2.75rem 0.9375rem 3rem;
  border: 2px solid transparent;
  border-radius: 50px;
  font-family: 'Open Sans', sans-serif;
  font-size: 1rem;
  background: var(--white);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,.2);
}
.search-bar input:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 4px rgba(0,191,143,.2);
}
.search-clear {
  position: absolute; right: 1rem; top: 50%; transform: translateY(-50%);
  background: none; border: none; font-size: 1.25rem; color: var(--gray);
  cursor: pointer; line-height: 1; padding: 0.25rem;
}
.search-clear:hover { color: var(--color-text); }

/* ===== Layout ===== */
.main-content { flex: 1; width: 100%; }
.content-layout {
  display: grid;
  grid-template-columns: 270px 1fr;
  gap: 1.5rem;
  padding: 1.5rem 0 2.5rem;
}

/* ===== Filter Sidebar ===== */
.filter-sidebar {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 1.125rem;
  align-self: start;
  position: sticky;
  top: 1.25rem;
  max-height: calc(100vh - 2.5rem);
  overflow-y: auto;
  box-shadow: var(--shadow-sm);
}
.filter-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 0.875rem;
  padding-bottom: 0.875rem;
  border-bottom: 2px solid var(--teal-light);
}
.filter-header h2 {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.01em;
}
.filter-reset-btn {
  background: none; border: none;
  color: var(--teal-dark);
  font-family: 'Open Sans', sans-serif;
  font-size: 0.75rem;
  cursor: pointer; font-weight: 600;
  transition: color var(--transition);
}
.filter-reset-btn:hover { color: var(--navy); text-decoration: underline; }

.filter-group { border-bottom: 1px solid var(--color-border); }
.filter-group:last-child { border-bottom: none; }

.filter-toggle {
  display: flex; justify-content: space-between; align-items: center;
  width: 100%; background: none; border: none; padding: 0.6rem 0;
  font-family: 'Open Sans', sans-serif;
  font-size: 0.8125rem; font-weight: 600;
  color: var(--color-text); cursor: pointer; text-align: left;
  transition: color var(--transition);
}
.filter-toggle:hover { color: var(--teal-dark); }
.filter-toggle .chevron { transition: transform var(--transition); color: var(--gray); }
.filter-toggle[aria-expanded="false"] .chevron { transform: rotate(-90deg); }

.filter-body {
  display: flex; flex-direction: column; gap: 0.3rem;
  padding-bottom: 0.75rem;
}
.filter-body[hidden] { display: none; }
.filter-body label {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.8rem; color: var(--color-text); cursor: pointer;
  padding: 0.15rem 0; transition: color var(--transition);
}
.filter-body label:hover { color: var(--teal-dark); }
.filter-body input[type="radio"],
.filter-body input[type="checkbox"] {
  accent-color: var(--teal);
  width: 15px; height: 15px; flex-shrink: 0;
}

.price-range { margin-top: 0.5rem; }
.range-label { font-size: 0.75rem; color: var(--color-muted); display: block; margin-bottom: 0.3rem; }
.range-inputs { display: flex; align-items: center; gap: 0.375rem; }
.range-inputs input {
  width: 76px; padding: 0.35rem 0.5rem;
  border: 1px solid var(--color-border); border-radius: 6px;
  font-family: 'Open Sans', sans-serif;
  font-size: 0.8125rem; outline: none;
  transition: border-color var(--transition);
}
.range-inputs input:focus { border-color: var(--teal); }
.range-sep { color: var(--color-muted); }

/* Mobile filter toggle */
.mobile-filter-toggle {
  display: none;
  align-items: center; gap: 0.5rem;
  background: var(--color-surface);
  border: 1.5px solid var(--teal);
  color: var(--teal-dark);
  border-radius: 50px;
  padding: 0.5rem 1.125rem;
  font-family: 'Open Sans', sans-serif;
  font-size: 0.875rem; font-weight: 600;
  cursor: pointer; margin-bottom: 1rem;
  transition: background var(--transition);
}
.mobile-filter-toggle:hover { background: var(--teal-light); }

/* ===== Results ===== */
.results-toolbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 1rem; flex-wrap: wrap; gap: 0.5rem;
}
.results-count {
  font-size: 0.875rem;
  color: var(--color-muted);
  font-weight: 500;
}
.sort-control {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}
.sort-control select {
  padding: 0.375rem 0.75rem;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  font-family: 'Open Sans', sans-serif;
  font-size: 0.8125rem;
  background: var(--color-surface);
  outline: none; cursor: pointer;
  transition: border-color var(--transition);
}
.sort-control select:focus { border-color: var(--teal); }

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.125rem;
}

/* ===== Course Card ===== */
.course-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex; flex-direction: column;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.course-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: var(--teal);
}

.card-header { display: flex; align-items: flex-start; gap: 0.75rem; margin-bottom: 0.75rem; }
.card-logo {
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--teal-light);
  color: var(--teal-dark);
  display: flex; align-items: center; justify-content: center;
  font-family: 'Montserrat', sans-serif;
  font-weight: 800; font-size: 0.875rem;
  flex-shrink: 0;
  border: 1.5px solid rgba(0,191,143,.2);
}
.card-title-block { flex: 1; min-width: 0; }
.card-title {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--navy);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-provider {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-top: 0.15rem;
  font-weight: 500;
}

.card-description {
  font-size: 0.8125rem;
  color: var(--color-muted);
  line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
  margin-bottom: 0.875rem;
}

.card-tags { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 0.875rem; }
.tag {
  background: var(--teal-light);
  color: var(--teal-dark);
  font-size: 0.6875rem; font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 50px;
  letter-spacing: 0.01em;
}

.card-meta {
  display: flex; flex-wrap: wrap; gap: 0.4rem 0.875rem;
  font-size: 0.75rem; color: var(--color-muted);
  margin-bottom: 0.875rem;
}
.meta-item { display: flex; align-items: center; gap: 0.275rem; }
.meta-item svg { width: 13px; height: 13px; flex-shrink: 0; color: var(--teal); }

.card-footer {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: auto;
  padding-top: 0.875rem;
  border-top: 1px solid var(--color-border);
}
.card-price {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--navy);
}
.card-price.free {
  color: var(--teal-dark);
}

/* CTA Button — Orange als Call-to-Action laut Brand Guide */
.btn-book {
  display: inline-flex; align-items: center; gap: 0.375rem;
  background: var(--orange);
  color: var(--navy);
  padding: 0.5rem 1.125rem;
  border: none;
  border-radius: 50px;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.8125rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 2px 8px rgba(255,179,0,.35);
  letter-spacing: 0.01em;
}
.btn-book:hover {
  background: var(--orange-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(255,179,0,.45);
}
.btn-book svg { width: 13px; height: 13px; }

/* Cert Badges */
.cert-badge {
  display: inline-flex; align-items: center;
  font-size: 0.6875rem; font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 50px;
  letter-spacing: 0.01em;
}
.cert-badge.zertifikat {
  background: rgba(0,191,143,.15);
  color: var(--teal-dark);
  border: 1px solid rgba(0,191,143,.3);
}
.cert-badge.bescheinigung {
  background: rgba(247,215,0,.2);
  color: #7a6500;
  border: 1px solid rgba(247,215,0,.4);
}
.cert-badge.ohne {
  background: var(--gray-light);
  color: var(--color-muted);
  border: 1px solid var(--color-border);
}

/* Loading indicator */
.loading-indicator {
  text-align: center; padding: 3rem 1rem; color: var(--color-muted);
}
.loading-indicator p { margin-top: 1rem; font-size: 0.9375rem; }
.spinner {
  width: 40px; height: 40px; margin: 0 auto;
  border: 3px solid var(--teal-light);
  border-top-color: var(--teal);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Error message */
.error-message {
  text-align: center; padding: 2rem 1rem; color: #ef4444;
}
.error-message p { margin-top: 0.75rem; font-size: 0.9375rem; }

/* Demo banner */
.demo-banner {
  background: rgba(247,215,0,.18);
  color: #7a6500;
  border: 1px solid rgba(247,215,0,.4);
  text-align: center;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* No results */
.no-results {
  text-align: center; padding: 3rem 1rem; color: var(--color-muted);
}
.no-results p { margin-top: 0.75rem; font-size: 1rem; }
.no-results-hint { font-size: 0.875rem; margin-top: 0.25rem; }

/* ===== Footer ===== */
.site-footer {
  background: var(--navy);
  color: var(--gray);
  text-align: center;
  padding: 1.5rem 0;
  font-size: 0.8125rem;
  margin-top: 2rem;
  border-top: 3px solid var(--teal);
}

/* ===== Scrollbar ===== */
.filter-sidebar::-webkit-scrollbar { width: 4px; }
.filter-sidebar::-webkit-scrollbar-track { background: transparent; }
.filter-sidebar::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 4px; }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .content-layout { grid-template-columns: 1fr; }
  .filter-sidebar {
    display: none;
    position: fixed; inset: 0; z-index: 200;
    border-radius: 0; max-height: 100vh;
    padding: 1.25rem; overflow-y: auto;
  }
  .filter-sidebar.open { display: block; }
  .mobile-filter-toggle { display: inline-flex; }
  .results-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
}

@media (max-width: 520px) {
  .header-title { font-size: 1.4rem; }
  .header-logo-img { height: 40px; }
  .search-headline { font-size: 1.2rem; }
  .search-bar input { font-size: 0.9375rem; padding: 0.8rem 2.5rem 0.8rem 2.75rem; }
  .results-grid { grid-template-columns: 1fr; }
  .card-header { gap: 0.5rem; }
  .card-logo { width: 38px; height: 38px; font-size: 0.8rem; }
}