/* ==========================================================================
   Modernes Design-System für Python OOP Lernportal
   ========================================================================== */

:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #eef2ff;
  --secondary: #06b6d4;
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --purple: #8b5cf6;
  --purple-light: #f5f3ff;

  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-code: #1e293b;
  --border-color: #e2e8f0;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-code: #f1f5f9;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'Fira Code', 'JetBrains Mono', Consolas, Monaco, 'Courier New', monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.65;
  font-size: 16px;
  padding-bottom: 60px;
}

/* Header & Navigation */
header {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  color: white;
  padding: 30px 20px;
  box-shadow: var(--shadow-md);
  margin-bottom: 35px;
}

.header-container {
  max-width: 900px;
  margin: 0 auto;
}

.nav-links {
  display: flex;
  gap: 15px;
  margin-bottom: 15px;
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.15);
  padding: 4px 12px;
  border-radius: 20px;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-links a:hover {
  background: rgba(255, 255, 255, 0.3);
  color: white;
  transform: translateY(-1px);
}

.header-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

header h1 {
  font-size: 2.1rem;
  font-weight: 800;
  margin-bottom: 6px;
  line-height: 1.25;
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* Main Container */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Content Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 25px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.card h2 {
  font-size: 1.45rem;
  color: var(--primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 2px solid var(--primary-light);
  padding-bottom: 8px;
}

.card h3 {
  font-size: 1.2rem;
  margin: 20px 0 10px 0;
  color: var(--text-main);
}

.card p {
  margin-bottom: 14px;
}

/* Didactic Callout Boxes */
.box {
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin: 20px 0;
  border-left: 5px solid;
}

.box-title {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.box-analogie {
  background-color: var(--purple-light);
  border-left-color: var(--purple);
  color: #4c1d95;
}

.box-tipp {
  background-color: var(--primary-light);
  border-left-color: var(--primary);
  color: #312e81;
}

.box-warning {
  background-color: var(--warning-light);
  border-left-color: var(--warning);
  color: #78350f;
}

.box-danger {
  background-color: var(--danger-light);
  border-left-color: var(--danger);
  color: #7f1d1d;
}

.box-success {
  background-color: var(--success-light);
  border-left-color: var(--success);
  color: #064e3b;
}

/* Code Blocks */
.code-container {
  background-color: var(--bg-code);
  border-radius: var(--radius-md);
  margin: 18px 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.code-header {
  background-color: #0f172a;
  color: #94a3b8;
  padding: 8px 16px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-dots {
  display: flex;
  gap: 6px;
}

.code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot-red { background-color: #ef4444; }
.dot-yellow { background-color: #f59e0b; }
.dot-green { background-color: #10b981; }

pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--text-code);
  line-height: 1.55;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: #f1f5f9;
  color: #e11d48;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
}

/* Code Syntax Highlights */
.kw { color: #f472b6; font-weight: bold; }
.fn { color: #60a5fa; }
.str { color: #a7f3d0; }
.num { color: #fbbf24; }
.cm { color: #64748b; font-style: italic; }
.var { color: #cbd5e1; }
.attr { color: #38bdf8; }

/* Keyboard Shortcut Badges */
kbd {
  display: inline-block;
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  font-weight: 700;
  color: #334155;
  background-color: #f1f5f9;
  border: 1px solid #cbd5e1;
  border-bottom: 2px solid #94a3b8;
  border-radius: 4px;
  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
  margin: 0 2px;
}

/* Extension Cards (for VS Code Guide) */
.extension-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.extension-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, border-color 0.2s;
}

.extension-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.extension-icon {
  font-size: 1.8rem;
  background: var(--primary-light);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.extension-info h4 {
  font-size: 1.05rem;
  color: var(--text-main);
  margin-bottom: 4px;
}

.extension-info p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.4;
}

/* Accordion / Details */
details {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin: 12px 0;
  transition: all 0.2s;
}

details[open] {
  background: #ffffff;
  border-color: var(--primary);
}

summary {
  font-weight: 600;
  cursor: pointer;
  color: var(--primary);
  user-select: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

summary:hover {
  color: var(--primary-hover);
}

.details-content {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border-color);
}

/* Checklists & Tasks */
.task-list {
  list-style: none;
  margin: 15px 0;
}

.task-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 14px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  transition: background 0.2s;
}

.task-item:hover {
  background: var(--primary-light);
}

.task-checkbox {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  accent-color: var(--primary);
  cursor: pointer;
}

.task-label {
  flex: 1;
}

/* Grid & Roadmap Cards (for Overview) */
.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin: 25px 0;
}

.roadmap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-sm);
}

.roadmap-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.roadmap-number {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-light);
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  margin-bottom: 10px;
  align-self: flex-start;
}

.roadmap-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.roadmap-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  flex: 1;
}

.roadmap-footer {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Buttons & Links */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: #f1f5f9;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: #e2e8f0;
}

.footer-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 35px;
  gap: 15px;
  flex-wrap: wrap;
}

/* Responsive */
@media (max-width: 600px) {
  header h1 { font-size: 1.6rem; }
  .card { padding: 18px; }
  .footer-nav { flex-direction: column; }
  .footer-nav .btn { width: 100%; justify-content: center; }
  .extension-grid { grid-template-columns: 1fr; }
}