/* ===================================================
   physik.dj4pax.de – Haupt-Stylesheet
   Mokka-Design-Tokens, angelehnt an dj4pax.de
   =================================================== */

:root {
  --mokka-dark:    #3b2a1a;   /* Navbar, H1 */
  --mokka-medium:  #6b4c2a;   /* Karten-Border, Akzente */
  --mokka-light:   #c8a882;   /* Hover */
  --mokka-cream:   #f5efe6;   /* Seitenhintergrund */
  --mokka-white:   #fdfaf6;   /* Karten-Hintergrund */
  --physik-accent: #2d6a8f;   /* Links, Formeln (Kontrast) */
  --physik-accent-light: #d6eaf8;  /* Hinweis-Hintergrund */
  --text-primary:  #1a1a1a;
  --text-muted:    #6c6c6c;
  --border-radius: 8px;
  --shadow:        0 2px 8px rgba(59,42,26,0.10);
  --shadow-hover:  0 4px 16px rgba(59,42,26,0.18);
}

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

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--mokka-cream);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Navbar ===== */
.navbar {
  background-color: var(--mokka-dark);
  padding: 0.75rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.navbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.navbar-brand {
  color: var(--mokka-cream);
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar-brand:hover {
  color: var(--mokka-light);
}

.navbar-brand .brand-icon {
  font-size: 1.4rem;
}

.navbar-nav {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  align-items: center;
}

.navbar-nav a {
  color: var(--mokka-light);
  text-decoration: none;
  padding: 0.4rem 0.85rem;
  border-radius: var(--border-radius);
  font-size: 0.95rem;
  transition: background 0.2s, color 0.2s;
}

.navbar-nav a:hover,
.navbar-nav a.active {
  background: rgba(200,168,130,0.2);
  color: var(--mokka-cream);
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--mokka-cream);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  background: none;
  padding: 0.75rem 0;
  margin-bottom: 0;
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  align-items: center;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.breadcrumb-list li:not(:last-child)::after {
  content: '›';
  margin-left: 0.25rem;
  color: var(--mokka-light);
}

.breadcrumb-list a {
  color: var(--physik-accent);
  text-decoration: none;
}

.breadcrumb-list a:hover {
  text-decoration: underline;
}

/* ===== Main-Content ===== */
.main-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  width: 100%;
  flex: 1;
}

/* ===== Karten ===== */
.card {
  background: var(--mokka-white);
  border: 1px solid var(--mokka-light);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.card-link:hover .card {
  box-shadow: var(--shadow-hover);
  border-color: var(--mokka-medium);
}

.card-title {
  color: var(--mokka-dark);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.card-meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-primary);
}

.card-badge {
  display: inline-block;
  background: var(--mokka-medium);
  color: white;
  font-size: 0.72rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  margin-top: 0.6rem;
  font-weight: 500;
}

/* ===== Überschriften ===== */
h1 {
  color: var(--mokka-dark);
  font-size: 1.9rem;
  margin-bottom: 0.4rem;
  font-weight: 700;
  line-height: 1.3;
}

h2 {
  color: var(--mokka-dark);
  font-size: 1.35rem;
  margin: 2rem 0 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--mokka-light);
}

h3 {
  color: var(--mokka-medium);
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}

h4 {
  color: var(--mokka-medium);
  font-size: 1rem;
  margin: 1.25rem 0 0.4rem;
}

/* ===== Einheiten-Seite ===== */
.unit-header {
  margin-bottom: 1.5rem;
}

.unit-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.unit-meta .badge {
  background: var(--physik-accent);
  color: white;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  font-size: 0.78rem;
}

.unit-meta .badge-lehrwerk {
  background: var(--mokka-medium);
}

/* ===== Lernziele-Box ===== */
.lernziele-box {
  background: var(--physik-accent-light);
  border-left: 4px solid var(--physik-accent);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
}

.lernziele-box h2,
.lernziele-box h3 {
  color: var(--physik-accent);
  border: none;
  margin: 0 0 0.6rem;
  font-size: 1rem;
  padding: 0;
}

.lernziele-box ul {
  padding-left: 1.25rem;
}

.lernziele-box li {
  margin-bottom: 0.25rem;
}

/* ===== Aufgaben ===== */
.aufgabe {
  background: var(--mokka-white);
  border: 1px solid var(--mokka-light);
  border-radius: var(--border-radius);
  padding: 1.25rem;
  margin: 1rem 0;
  box-shadow: var(--shadow);
}

.aufgabe-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.aufgabe-nummer {
  font-weight: 700;
  color: var(--mokka-dark);
}

.schwierigkeits-badge {
  font-size: 0.75rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-weight: 600;
}

.schwierigkeits-badge.leicht  { background: #d4edda; color: #155724; }
.schwierigkeits-badge.mittel  { background: #fff3cd; color: #856404; }
.schwierigkeits-badge.schwer  { background: #f8d7da; color: #721c24; }

/* ===== Lösungs-Toggle ===== */
.loesung-toggle {
  margin-top: 0.75rem;
}

.loesung-btn {
  background: none;
  border: 1px solid var(--physik-accent);
  color: var(--physik-accent);
  padding: 0.35rem 0.9rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 0.875rem;
  transition: background 0.2s, color 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.loesung-btn:hover,
.loesung-btn.offen {
  background: var(--physik-accent);
  color: white;
}

.loesung-btn .icon {
  font-size: 0.85rem;
  transition: transform 0.2s;
}

.loesung-btn.offen .icon {
  transform: rotate(180deg);
}

.loesung-inhalt {
  display: none;
  background: var(--mokka-cream);
  border: 1px solid var(--mokka-light);
  border-radius: var(--border-radius);
  padding: 1rem 1.25rem;
  margin-top: 0.6rem;
  animation: einblenden 0.2s ease;
}

.loesung-inhalt.sichtbar {
  display: block;
}

@keyframes einblenden {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== Formeln (MathJax kompatibel) ===== */
.formel-block {
  background: var(--mokka-white);
  border: 1px solid var(--mokka-light);
  border-radius: var(--border-radius);
  padding: 0.75rem 1.25rem;
  margin: 1rem 0;
  text-align: center;
  font-size: 1.15rem;
  font-family: 'Georgia', serif;
  color: var(--physik-accent);
}

/* ===== Code ===== */
code {
  background: var(--mokka-cream);
  border: 1px solid var(--mokka-light);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'Consolas', 'Courier New', monospace;
}

pre {
  background: var(--mokka-cream);
  border: 1px solid var(--mokka-light);
  border-radius: var(--border-radius);
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
}

pre code {
  background: none;
  border: none;
  padding: 0;
}

/* ===== Links ===== */
a {
  color: var(--physik-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ===== Weiterführende Links ===== */
.links-section ul {
  list-style: none;
  padding: 0;
}

.links-section li {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--mokka-cream);
}

.links-section li::before {
  content: '→ ';
  color: var(--physik-accent);
  font-weight: bold;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--mokka-dark);
  color: var(--mokka-light);
  text-align: center;
  padding: 1.25rem;
  font-size: 0.85rem;
  margin-top: auto;
}

.site-footer a {
  color: var(--mokka-light);
}

.site-footer a:hover {
  color: var(--mokka-cream);
}

/* ===== Seiten-Hero ===== */
.page-hero {
  background: var(--mokka-dark);
  color: var(--mokka-cream);
  padding: 2rem 1.5rem;
  margin: -1.5rem -1.5rem 2rem;
  border-bottom: 3px solid var(--mokka-medium);
}

.page-hero h1 {
  color: var(--mokka-cream);
  margin-bottom: 0.25rem;
}

.page-hero p {
  color: var(--mokka-light);
  margin: 0;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.2rem; }

  .navbar-toggle {
    display: block;
  }

  .navbar-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    align-items: flex-start;
    padding-top: 0.75rem;
  }

  .navbar-nav.open {
    display: flex;
  }

  .navbar-inner {
    flex-wrap: wrap;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .page-hero {
    padding: 1.5rem 1rem;
    margin: -1.5rem -1rem 1.5rem;
  }
}

/* ===== Print ===== */
@media print {
  .navbar, .site-footer, .loesung-btn { display: none; }
  .loesung-inhalt { display: block !important; }
  body { background: white; }
}