/* UI5 FE Mockserver Tutorial - Modern CSS */
:root {
  /* Design tokens */
  --primary-color: #0070f2;
  --secondary-color: #354a5f;
  --accent-color: #ff6b35;
  --success-color: #30914c;
  --warning-color: #e9730c;
  --danger-color: #d73d3d;

  --text-primary: #32363a;
  --text-secondary: #6a6d70;
  --text-light: #91969a;

  --bg-primary: #ffffff;
  --bg-secondary: #f7f7f7;
  --bg-code: #1e1e1e;
  --border-color: #d9d9d9;
  --border-radius: 8px;

  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

  --container-max-width: 1200px;
  --sidebar-width: 280px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
}

/* Reset and base styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

/* Prevent horizontal page scroll on desktop */
html,
body {
  max-width: 100%;
  overflow-x: hidden; /* keep page scrollbar hidden */
}

/* Layout */
.site-container {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
  width: 100%;
}

.sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: var(--spacing-lg);
  position: fixed;
  width: var(--sidebar-width);
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
}

.main-content {
  grid-column: 2;
  padding: var(--spacing-lg);
  max-width: var(--container-max-width);
  margin: 0 auto;
  min-width: 0; /* allow shrinking inside grid to avoid overflow */
  width: 100%;
}

/* Mobile-first responsive design */
@media (max-width: 768px) {
  .site-container {
    grid-template-columns: 1fr;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    width: 100%;
    max-width: 320px;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    grid-column: 1;
    padding: var(--spacing-md);
  }

  .mobile-nav-toggle {
    display: block;
    position: fixed;
    top: var(--spacing-md);
    left: var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    z-index: 101;
    cursor: pointer;
  }
}

@media (min-width: 769px) {
  .mobile-nav-toggle {
    display: none;
  }
}

/* Typography */
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin: 0 0 var(--spacing-lg) 0;
  line-height: 1.2;
}

h2 {
  font-size: 2rem;
  font-weight: 600;
  color: var(--secondary-color);
  margin: var(--spacing-xl) 0 var(--spacing-md) 0;
  line-height: 1.3;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--secondary-color);
  margin: var(--spacing-lg) 0 var(--spacing-md) 0;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: var(--spacing-lg) 0 var(--spacing-sm) 0;
}

p {
  margin: 0 0 var(--spacing-md) 0;
  color: var(--text-primary);
}

/* Navigation */
.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
  text-decoration: none;
}

.nav-section {
  margin-bottom: var(--spacing-lg);
}

.nav-section h3 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin: 0 0 var(--spacing-sm) 0;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-item {
  margin-bottom: var(--spacing-xs);
}

.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all 0.2s ease;
  font-size: 0.9rem;
}

.nav-link:hover {
  background: var(--primary-color);
  color: white;
}

.nav-link.active {
  background: var(--primary-color);
  color: white;
  font-weight: 500;
}

.nav-link.completed {
  color: var(--success-color);
}

.nav-link.completed::after {
  content: '✓';
  float: right;
  color: var(--success-color);
}

/* Hero section */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.hero h1 {
  color: white;
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto var(--spacing-lg) auto;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  border: 2px solid white;
}

.btn-secondary:hover {
  background: white;
  color: var(--primary-color);
}

.btn-small {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
}

/* Exercise overview table */
.exercise-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Ensure wide tables and images never cause horizontal page scroll */
.main-content table,
.main-content img {
  max-width: 100%;
}

/* If a table is wider than content, scroll that table instead of the page */
.main-content .exercise-table,
.main-content table {
  display: block;
  overflow-x: auto;
  max-width: 100%;
}

/* Ensure code blocks scroll within container, not page */
.main-content pre[class*='language-'] {
  max-width: 100%;
  overflow-x: auto;
}

/* Prevent long words/URLs from causing overflow */
.main-content p,
.main-content li {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.exercise-table th,
.exercise-table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.exercise-table th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--secondary-color);
}

.exercise-table tr:hover {
  background: var(--bg-secondary);
}

.exercise-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.exercise-link:hover {
  text-decoration: underline;
}

/* Code blocks */
pre[class*='language-'] {
  position: relative;
  background: var(--bg-code) !important;
  border-radius: var(--border-radius);
  margin: var(--spacing-md) 0;
  overflow-x: auto;
  max-width: 100%;
  word-wrap: normal;
  white-space: pre;
}

pre[class*='language-'] code {
  font-family: var(--font-family-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  display: block;
  overflow-wrap: normal;
}

.copy-button {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: var(--primary-color);
  color: white;
  border: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s ease;
}

pre[class*='language-']:hover .copy-button {
  opacity: 1;
}

.copy-button:hover {
  background: var(--secondary-color);
}

/* Inline code */
:not(pre) > code[class*='language-'] {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-family-mono);
  font-size: 0.875em;
}

/* Content sections */
.content-section {
  margin-bottom: var(--spacing-xl);
  width: 100%;
  max-width: 100%;
}

.section-intro {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--primary-color);
}

/* Navigation between exercises */
.exercise-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
}

.exercise-nav-prev,
.exercise-nav-next {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.exercise-nav-prev:hover,
.exercise-nav-next:hover {
  text-decoration: underline;
}

/* Lists */
ul,
ol {
  padding-left: var(--spacing-lg);
  margin: var(--spacing-md) 0;
}

li {
  margin-bottom: var(--spacing-xs);
}

/* Alerts/callouts */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin: var(--spacing-md) 0;
  border-left: 4px solid;
}

.alert-info {
  background: #e7f3ff;
  border-color: var(--primary-color);
  color: #0066cc;
}

.alert-warning {
  background: #fff3cd;
  border-color: var(--warning-color);
  color: #856404;
}

.alert-success {
  background: #d4edda;
  border-color: var(--success-color);
  color: #155724;
}

.alert-danger {
  background: #f8d7da;
  border-color: var(--danger-color);
  color: #721c24;
}

/* Utility classes */
.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.text-right {
  text-align: right;
}

.mb-0 {
  margin-bottom: 0;
}
.mb-sm {
  margin-bottom: var(--spacing-sm);
}
.mb-md {
  margin-bottom: var(--spacing-md);
}
.mb-lg {
  margin-bottom: var(--spacing-lg);
}
.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.mt-0 {
  margin-top: 0;
}
.mt-sm {
  margin-top: var(--spacing-sm);
}
.mt-md {
  margin-top: var(--spacing-md);
}
.mt-lg {
  margin-top: var(--spacing-lg);
}
.mt-xl {
  margin-top: var(--spacing-xl);
}

/* Print styles */
@media print {
  .sidebar,
  .mobile-nav-toggle,
  .exercise-nav,
  .copy-button {
    display: none;
  }

  .site-container {
    grid-template-columns: 1fr;
  }

  .main-content {
    grid-column: 1;
    padding: 0;
    max-width: none;
  }
}

/* Code header above code blocks */
.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-bottom: none;
  padding: 6px 10px;
  font-family: var(--font-family-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-top-left-radius: var(--border-radius);
  border-top-right-radius: var(--border-radius);
  max-width: 100%;
  overflow: hidden;
  box-sizing: border-box;
}
.code-header span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}
.code-header a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
  margin-left: var(--spacing-sm);
}
.code-header a:hover {
  text-decoration: underline;
}
.code-header + pre[class*='language-'] {
  margin-top: 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}