/* CSS Design System for UAA Library & IoT Documentation Portal */

/* --- Variables & Tokens --- */
:root {
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', ui-monospace, monospace;

  /* Color Palette - Light Mode */
  --bg-app: #f8fafc;
  --bg-sidebar: rgba(255, 255, 255, 0.8);
  --bg-header: rgba(255, 255, 255, 0.7);
  --bg-card: #ffffff;
  --bg-code: #f1f5f9;
  --bg-alert-note: #eff6ff;
  --bg-alert-warning: #fffbeb;
  
  --border-color: #e2e8f0;
  --border-focus: #4f46e5;
  
  --text-main: #334155;
  --text-muted: #64748b;
  --text-heading: #0f172a;
  
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-light: #e0e7ff;
  --color-success: #10b981;
  --color-success-light: #ecfdf5;
  --color-warning: #f59e0b;
  --color-warning-light: #fffbeb;
  --color-danger: #ef4444;
  --color-danger-light: #fef2f2;
  --color-info: #06b6d4;
  --color-info-light: #ecfeff;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  
  --border-radius: 12px;
  --sidebar-width: 300px;
  --header-height: 72px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Tokens */
html.dark {
  --bg-app: #090d16;
  --bg-sidebar: rgba(13, 20, 35, 0.8);
  --bg-header: rgba(13, 20, 35, 0.7);
  --bg-card: #131c2e;
  --bg-code: #1e293b;
  --bg-alert-note: rgba(30, 41, 59, 0.5);
  --bg-alert-warning: rgba(120, 113, 108, 0.15);
  
  --border-color: #1e293b;
  --border-focus: #818cf8;
  
  --text-main: #cbd5e1;
  --text-muted: #64748b;
  --text-heading: #f8fafc;
  
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-primary-light: rgba(99, 102, 241, 0.15);
  --color-success: #10b981;
  --color-success-light: rgba(16, 185, 129, 0.15);
  --color-warning: #fbbf24;
  --color-warning-light: rgba(251, 191, 36, 0.15);
  --color-danger: #f87171;
  --color-danger-light: rgba(248, 113, 113, 0.15);
  --color-info: #22d3ee;
  --color-info-light: rgba(34, 211, 238, 0.15);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.625;
  color: var(--text-main);
  background-color: var(--bg-app);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* --- Layout Grid --- */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* --- Sidebar Styling (Glassmorphism) --- */
.app-sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal);
}

.sidebar-header {
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
  filter: drop-shadow(0 2px 8px rgba(79, 70, 229, 0.2));
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 16px;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: 0.5px;
}

.brand-sub {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
}

.sidebar-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: none;
  padding: 4px;
  border-radius: 6px;
  transition: background-color var(--transition-fast);
}
.sidebar-close-btn:hover {
  background-color: var(--bg-code);
  color: var(--text-heading);
}

/* Sidebar Menu Navigation */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 24px 16px;
}

.nav-category {
  margin-bottom: 28px;
}

.category-title {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
  padding-left: 8px;
}

.category-menu {
  list-style: none;
}

.category-menu li {
  margin-bottom: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  text-decoration: none;
  border-radius: 8px;
  transition: all var(--transition-fast);
  cursor: pointer;
  border-left: 2px solid transparent;
}

.nav-item:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  padding-left: 16px;
}

.nav-item.active {
  background-color: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
  border-left-color: var(--border-focus);
  box-shadow: 0 4px 12px -2px rgba(79, 70, 229, 0.3);
}

.sidebar-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  background-color: rgba(248, 250, 252, 0.4);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-info));
  color: white;
  font-weight: 700;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.user-meta {
  display: flex;
  flex-direction: column;
}

.user-role {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-heading);
}

.user-org {
  font-size: 11px;
  color: var(--text-muted);
}

/* --- Main Wrapper --- */
.main-wrapper {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* --- Header Styling (Glassmorphism) --- */
.app-header {
  height: var(--header-height);
  padding: 0 40px;
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--bg-header);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-toggle-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: none;
  padding: 8px;
  border-radius: 8px;
  margin-right: 12px;
}
.sidebar-toggle-btn:hover {
  background-color: var(--bg-code);
  color: var(--text-heading);
}

.header-left {
  display: flex;
  align-items: center;
}

.header-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
}

.header-breadcrumb .divider {
  color: var(--text-muted);
}

.header-breadcrumb .active-section {
  color: var(--text-heading);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Search Box with Shortcuts */
.search-box-container {
  position: relative;
  width: 280px;
}

.search-box {
  display: flex;
  align-items: center;
  background-color: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px 12px;
  width: 100%;
  transition: all var(--transition-fast);
}

.search-box:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--color-primary-light);
  background-color: var(--bg-card);
}

.search-icon {
  color: var(--text-muted);
  margin-right: 8px;
}

.search-box input {
  background: none;
  border: none;
  outline: none;
  width: 100%;
  font-family: var(--font-sans);
  color: var(--text-main);
  font-size: 13.5px;
}

.search-shortcut {
  background-color: var(--bg-code);
  color: var(--text-muted);
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  cursor: pointer;
}

/* Search Dropdown Results */
.search-results-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 320px;
  max-height: 400px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  overflow-y: auto;
  z-index: 120;
}

.search-result-item {
  display: flex;
  flex-direction: column;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  text-decoration: none;
  color: var(--text-main);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}
.search-result-item:hover {
  background-color: var(--bg-app);
}

.search-result-title {
  font-weight: 600;
  font-size: 13.5px;
  color: var(--text-heading);
}

.search-result-snippet {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.search-no-results {
  padding: 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--bg-code);
  color: var(--text-heading);
}

/* Show correct theme icon */
.icon-moon { display: block; }
.icon-sun { display: none; }
html.dark .icon-moon { display: none; }
html.dark .icon-sun { display: block; }

/* --- Content Container --- */
.content-container {
  flex: 1;
  padding: 48px 40px;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
}

/* --- Documentation Article Styling --- */
.documentation-article {
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.documentation-article p {
  margin-bottom: 18px;
  font-size: 15.5px;
  color: var(--text-main);
}

.documentation-article h1 {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
}

.section-subtitle {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-heading);
  margin-top: 32px;
  margin-bottom: 16px;
  position: relative;
  padding-left: 12px;
}
.section-subtitle::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

/* Lists */
.step-list {
  list-style: none;
  margin-bottom: 24px;
  counter-reset: step-counter;
}

.step-list li {
  position: relative;
  padding-left: 36px;
  margin-bottom: 12px;
  font-size: 15px;
  counter-increment: step-counter;
}

.step-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 2px;
  width: 22px;
  height: 22px;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-list {
  list-style: none;
  margin-bottom: 24px;
}

.feature-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 8px;
  font-size: 15px;
}

.feature-list li::before {
  content: "•";
  color: var(--color-primary);
  font-size: 20px;
  position: absolute;
  left: 6px;
  top: -2px;
}

/* Badges & Tags */
.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 4px;
  margin: 0 2px;
  font-family: var(--font-sans);
}

.badge-primary { background-color: var(--color-primary-light); color: var(--color-primary); }
.badge-secondary { background-color: var(--bg-code); color: var(--text-main); border: 1px solid var(--border-color); }
.badge-success { background-color: var(--color-success-light); color: var(--color-success); }
.badge-warning { background-color: var(--color-warning-light); color: var(--color-warning); }
.badge-danger { background-color: var(--color-danger-light); color: var(--color-danger); }
.badge-info { background-color: var(--color-info-light); color: var(--color-info); }

/* Alerts / Blockquotes */
.alert {
  padding: 16px 20px;
  border-left: 4px solid;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  margin: 24px 0;
  font-size: 14.5px;
}

.alert-note {
  background-color: var(--bg-alert-note);
  border-left-color: var(--color-info);
  color: var(--text-main);
}

.alert-warning {
  background-color: var(--bg-alert-warning);
  border-left-color: var(--color-warning);
  color: var(--text-main);
}

/* Image Presentation with Caption */
.image-container {
  margin: 32px 0;
  padding: 16px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.image-container:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.zoomable-image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  cursor: zoom-in;
  border: 1px solid var(--border-color);
  transition: opacity var(--transition-fast);
}
.zoomable-image:hover {
  opacity: 0.95;
}

.image-caption {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 12px;
  margin-bottom: 0 !important;
  font-weight: 500;
}

/* Premium styled Table */
.premium-table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 14px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.premium-table th, .premium-table td {
  padding: 14px 18px;
  text-align: left;
}

.premium-table th {
  background-color: var(--bg-app);
  color: var(--text-heading);
  font-weight: 700;
  border-bottom: 1px solid var(--border-color);
}

.premium-table td {
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

.premium-table tr:last-child td {
  border-bottom: none;
}

.premium-table tr:nth-child(even) {
  background-color: rgba(248, 250, 252, 0.4);
}

/* Accordion layout for troubleshooting */
.troubleshoot-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.troubleshoot-item {
  transition: transform var(--transition-fast);
}
.troubleshoot-item:hover {
  transform: scale(1.005);
}

/* --- Content Navigation Footer --- */
.content-navigation-footer {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  margin-top: 56px;
  padding-top: 32px;
  gap: 20px;
}

.nav-btn {
  flex: 1;
  display: flex;
  align-items: center;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 16px 20px;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-main);
  outline: none;
}

.nav-btn:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  color: var(--color-primary);
}

.prev-btn {
  justify-content: flex-start;
  text-align: left;
}

.next-btn {
  justify-content: flex-end;
  text-align: right;
}

.nav-btn-text {
  display: flex;
  flex-direction: column;
  margin: 0 12px;
}

.nav-btn-label {
  font-size: 11px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.nav-btn-title {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text-heading);
  margin-top: 4px;
}

.nav-btn:hover .nav-btn-title {
  color: var(--color-primary);
}

/* Lightbox Modal */
.lightbox-modal {
  display: none;
  position: fixed;
  z-index: 1000;
  padding-top: 60px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(9, 13, 22, 0.95);
  backdrop-filter: blur(8px);
}

.lightbox-content {
  margin: auto;
  display: block;
  max-width: 90%;
  max-height: 80vh;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: zoomModal 0.25s ease-out;
}

@keyframes zoomModal {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 35px;
  color: #f1f5f9;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
  cursor: pointer;
}
.lightbox-close:hover,
.lightbox-close:focus {
  color: var(--color-primary);
  text-decoration: none;
}

.lightbox-caption {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  text-align: center;
  color: #cbd5e1;
  padding: 16px 0;
  font-size: 14px;
  font-weight: 500;
}

/* Utility layout extensions */
.max-w-xs { max-width: 320px; }
.mt-6 { margin-top: 24px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.pl-5 { padding-left: 20px; }
.list-disc { list-style-type: disc; }
.font-bold { font-weight: 700; }
.font-mono { font-family: var(--font-mono); }
.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-indigo-600 { color: var(--color-primary); }
.bg-slate-100 { background-color: var(--bg-code); }
.rounded { border-radius: 4px; }
.w-1/3 { width: 33.333333%; }
.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.gap-4 { gap: 16px; }
.flex { display: flex; }
.items-center { align-items: center; }
.space-x-4 > * + * { margin-left: 16px; }
.space-y-4 > * + * { margin-top: 16px; }
.p-4 { padding: 16px; }
.bg-slate-50 { background-color: var(--bg-code); }
.rounded-lg { border-radius: 8px; }
.rounded-xl { border-radius: 12px; }
.text-center { text-align: center; }
.text-xs { font-size: 12px; }
.text-sm { font-size: 13.5px; }
.text-red-500 { color: var(--color-danger); }
.text-slate-400 { color: var(--text-muted); }
.block { display: block; }
.border { border: 1px solid var(--border-color); }
.w-full { width: 100%; }
.p-3 { padding: 12px; }
.bg-indigo-100 { background-color: var(--color-primary-light); }
.text-indigo-700 { color: var(--color-primary); }
.bg-indigo-500 { background-color: var(--color-primary); }
.text-white { color: #ffffff; }
.bg-slate-800 { background-color: var(--bg-code); }
.bg-emerald-500 { background-color: var(--color-success); }
.border-slate-200 { border-color: var(--border-color); }

/* --- Mobile Responsiveness --- */
@media (max-width: 1024px) {
  .app-sidebar {
    transform: translateX(-100%);
    box-shadow: 0 0 20px rgba(0,0,0,0.15);
  }
  
  .app-sidebar.open {
    transform: translateX(0);
  }

  .sidebar-close-btn {
    display: block;
  }

  .main-wrapper {
    margin-left: 0;
  }

  .sidebar-toggle-btn {
    display: block;
  }

  .app-header {
    padding: 0 24px;
  }

  .content-container {
    padding: 32px 24px;
  }
}

@media (max-width: 768px) {
  .search-box-container {
    width: 200px;
  }
  .search-shortcut {
    display: none;
  }
  .header-breadcrumb {
    display: none;
  }
  .content-navigation-footer {
    flex-direction: column;
  }
  .nav-btn {
    width: 100%;
  }
  .grid-cols-2 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }
  .image-container.grid-cols-2 {
    display: flex;
    flex-direction: column;
  }
}