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

/* Base Styles */
:root {
  /* Brand Primary */
  /* --primary-color: #0174ff; */
  --primary-color: #476DDA;
  --primary-hover: #01AEFF;
  --accent-color: #476DDA;
  --accent-hover: #ffffff;

  /* Backgrounds */
  --background-main: #f3f4f6;
  --background-hero: #f8fafc;
  --background-card: #fff;
  --background-sidebar: #1f2937;

  /* Text */
  --text-main: #1f2937;
  --text-light: #f3f4f6;
  --text-muted: #6b7280;

  /* Sidebar */
  --sidebar-bg: #1f2937;
  --sidebar-text: #f3f4f6;
  --sidebar-hover: #374151;
  --sidebar-active: #333333;

  /* Alerts & Status */
  --success-bg: #d1fae5;
  --success-color: #065f46;
  --error-bg: #fee2e2;
  --error-color: #991b1b;
  --sidebar-width: 250px;
  --sidebar-collapsed-width: 60px;
}

/* Hamburger button (navbar-toggler) customization for mobile */
.navbar-toggler {
  border-color: #fff !important;
}
.navbar-toggler .navbar-toggler-icon {
  background-image: none !important;
  position: relative;
  width: 1.5em;
  height: 1.5em;
  display: flex;
  align-items: center;
  justify-content: center;
}

.navbar-toggler .navbar-toggler-icon:before,
.navbar-toggler .navbar-toggler-icon:after,
.navbar-toggler .navbar-toggler-icon span {
  background: #fff !important;
}

/* Custom hamburger lines for all Bootstrap versions */
.navbar-toggler-icon {
  display: inline-block;
  width: 1.5em;
  height: 1.5em;
  vertical-align: middle;
  background-image: none !important;
  position: relative;
}
.navbar-toggler-icon:before,
.navbar-toggler-icon:after,
.navbar-toggler-icon span {
  content: '';
  display: block;
  height: 3px;
  width: 100%;
  background: #fff;
  border-radius: 2px;
  margin: 0.25em 0;
  transition: all 0.3s cubic-bezier(.4,2,.6,1);
  position: relative;
}
.navbar-toggler-icon {
  position: relative;
}
.navbar-toggler-icon:before {
  position: absolute;
  top: 0.3em;
  left: 0;
}
.navbar-toggler-icon span {
  position: absolute;
  top: 0.65em;
  left: 0;
}
.navbar-toggler-icon:after {
  position: absolute;
  bottom: 0.3em;
  left: 0;
}

/* Hamburger animation when menu is open */
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon:before {
  transform: translateY(0.35em) rotate(45deg);
}
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon span {
  opacity: 0;
}
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon:after {
  transform: translateY(-0.35em) rotate(-45deg);
}

/* Example usage for navbar, buttons, cards, etc. */
.navbar {
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
  color: var(--text-light);
  border-radius: 0 !important;
  box-shadow: 0 2px 12px rgba(2,139,255,0.08), 0 1.5px 3px rgba(0,0,0,0.03);
  border-bottom: 3px solid var(--accent-color);
  min-height: 72px;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  position: relative;
}

/* Animated underline for active nav link */
.navbar-nav .nav-link.active {
  position: relative;
}
.navbar-nav .nav-link.active::after {
  content: '';
  display: block;
  width: 100%;
  height: 3px;
  background: var(--accent-color);
  position: absolute;
  left: 0;
  bottom: -6px;
  border-radius: 2px;
  transition: width 0.3s;
}

.btn-primary, .btn, .custom-btn, button {
  background: var(--primary-color);
  color: var(--text-light);
}
.btn-primary:hover, .btn:hover, .custom-btn:hover, button:hover {
  background: var(--primary-hover);
}
.card, .custom-card {
  background: var(--background-card);
  color: var(--text-main);
}
body {
  background: var(--background-main);
  color: var(--text-main);
}
.sidebar-nav .nav-link {
  color: var(--sidebar-text);
}
.sidebar-nav .nav-link:hover, .sidebar-nav .nav-link.active {
  background-color: var(--sidebar-hover);
  color: var(--text-light);
  border-left-color: var(--sidebar-active);
}
.alert-success {
  background-color: var(--success-bg);
  color: var(--success-color);
}
.alert-danger, .alert-error {
  background-color: var(--error-bg);
  color: var(--error-color);
}
.text-muted {
  color: var(--text-muted) !important;
}


html {
  height: 100%;
}

body {
  font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  padding-top: 56px;
  padding: 0;
  margin: 0;
  background-color: #f3f4f6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

main {
  flex: 1 0 auto;
  width: 100%;
  margin-bottom: 2rem;
}

/* Container */
.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 1rem;
}
@media (max-width: 768px) {
  .container {
    max-width: 100%;
    padding: 0 0.5rem;
  }
}

/* Forms */
form {
  background: white;
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 4px 16px rgba(2,139,255,0.08), 0 1.5px 3px rgba(0,0,0,0.03);
  transition: box-shadow 0.2s, transform 0.2s;
}
form:hover {
  box-shadow: 0 8px 32px rgba(2,139,255,0.13), 0 3px 6px rgba(0,0,0,0.05);
  transform: translateY(-2px) scale(1.01);
}

form div {
  margin-bottom: 1rem;
}

.card,
.custom-card {
  border-radius: 1rem;
  box-shadow: 0 4px 16px rgba(2,139,255,0.08), 0 1.5px 3px rgba(0,0,0,0.03);
  background: #fff;
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover,
.custom-card:hover {
  box-shadow: 0 8px 32px rgba(2,139,255,0.13), 0 3px 6px rgba(0,0,0,0.05);
  transform: translateY(-3px) scale(1.01);
}

.modern-gradient {
  background: linear-gradient(135deg, #476DDA 0%, #01AEFF 100%);
  color: #fff;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  font-size: 1rem;
  color: #374151;
}

input[type="text"],
input[type="password"],
textarea,
select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  font-size: 1.1rem;
  min-height: 44px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus, textarea:focus, select:focus {
  border-color: #476DDA;
  box-shadow: 0 0 0 2px rgba(2,139,255,0.15);
  outline: none;
}


.btn,
.custom-btn,
button {
  background: var(--primary-color);
  color: white;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.1rem;
  min-width: 44px;
  min-height: 44px;
  box-shadow: 0 2px 4px rgba(2,139,255,0.10);
  transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
  outline: none;
}
.btn:focus, .btn:active, .custom-btn:focus, .custom-btn:active, button:focus, button:active {
  outline: 2px solid #01AEFF;
  outline-offset: 2px;
  background: #01AEFF;
  box-shadow: 0 4px 8px rgba(2,139,255,0.15);
  transform: translateY(-2px);
}
.btn:hover, .custom-btn:hover, button:hover {
  background: #01AEFF;
  color: #fff;
}

button:hover:not(:disabled) {
  background: var(--primary-hover);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Quiz Container */
.quiz-container {
  background: white;
  padding: 2rem 1rem;
  border-radius: 1rem;
  box-shadow: 0 4px 12px rgba(2,139,255,0.08);
  margin-bottom: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}
@media (max-width: 576px) {
  .quiz-container {
    padding: 1rem 0.5rem;
    border-radius: 0.75rem;
  }
}

/* Top Navigation Bar */
.top-nav-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding: 1rem;
  background: #f8fafc;
  border-radius: 1rem;
  gap: 1rem;
}
@media (max-width: 576px) {
  .top-nav-bar {
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem;
    gap: 0.5rem;
  }
}

/* Navbar override */
.navbar {
  background-color: var(--primary-color) !important;
  padding: 1rem;
  border-radius: 0.5rem;
  box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
}
.navbar .nav-link {
  color: white !important;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  transition: all 0.2s;
}
.navbar .nav-link:hover {
  background: rgba(255,255,255,0.1) !important;
  transform: translateY(-1px);
}
.navbar .nav-link.active {
  background: rgba(255,255,255,0.15) !important;
  font-weight: 600;
}
.navbar .user-name {
  margin-left: auto;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 0.375rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}

/* Question Blocks */
.question-block {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: #f8fafc;
  border-radius: 0.5rem;
  border: 1px solid #e5e7eb;
}

.question-block.is-retrying {
  outline: 2px dashed #fbbf24;
  outline-offset: 2px;
}

.question-text {
  font-weight: 600;
  margin-bottom: 1rem;
  color: #1f2937;
}

/* Options */
.options {
  margin-bottom: 1.5rem;
}

.option-label {
  display: block;
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  border: 1px solid #e5e7eb;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: all 0.2s;
}

.option-label:hover:not(.disabled) {
  background: #f3f4f6;
}

.option-label.disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.option-label.correct-option {
  background-color: var(--success-bg) !important;
  border-color: #a7f3d0;
}

.option-label.selected-incorrect {
  background-color: var(--error-bg) !important;
  border-color: #fecaca;
}

/* Feedback Messages */
.feedback {
  margin-top: 0.75rem;
  padding: 0.75rem;
  border-radius: 0.25rem;
  font-size: 0.875rem;
}

.feedback.correct {
  background-color: #d1fae5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.feedback.incorrect {
  background-color: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.feedback .explanation {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  color: #4b5563;
  font-size: 0.875rem;
  line-height: 1.5;
}

/* Footer */
.app-footer {
  margin-top: auto;
  padding: 1.5rem 1rem;
  text-align: center;
  font-size: 0.875rem;
  color: white;
  background-color: var(--primary-color);
  border-top: 1px solid #e5e7eb;
}
.app-footer a {
  color: white;
  text-decoration: none;
  transition: color 0.2s;
}
.app-footer a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* Navigation Buttons */
.nav-btn {
  padding: 0.75rem 1.5rem;
  border-radius: 0.375rem;
  font-weight: 500;
}

.nav-btn.prev {
  background: white;
  border: 1px solid #d1d5db;
  color: #374151;
}

.nav-btn.next {
  background: var(--primary-color);
}

.try-again-btn {
  background: white;
  border: 1px solid #d1d5db;
  color: #374151;
}

/* Flash Messages */
.flash {
  padding: 1rem;
  margin-bottom: 1rem;
  border-radius: 0.375rem;
  font-weight: 500;
}

.flash-success {
  background: var(--success-bg);
  color: var(--success-color);
}

.flash-danger {
  background: var(--error-bg);
  color: var(--error-color);
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Admin Dashboard Layout */
.dashboard-container {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* Admin Dashboard Sidebar Collapse */
.dashboard-sidebar {
  transition: width 0.3s;
  overflow: hidden;
}
.dashboard-sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}
.dashboard-sidebar.collapsed .sidebar-nav {
  opacity: 0;
  visibility: hidden;
}
@media (max-width: 992px) {
  .dashboard-sidebar {
    width: var(--sidebar-collapsed-width);
  }
  .dashboard-sidebar.collapsed {
    width: var(--sidebar-width);
  }
  .dashboard-sidebar .sidebar-nav {
    opacity: 0;
    visibility: hidden;
  }
  .dashboard-sidebar.collapsed .sidebar-nav {
    opacity: 1;
    visibility: visible;
  }
}

/* Sidebar Styles */
.dashboard-sidebar {
  width: var(--sidebar-width);
  background-color: var(--sidebar-bg);
  color: var(--sidebar-text);
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  z-index: 1000;
  box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.sidebar-header {
  position: relative;
  padding: 1.5rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.dashboard-sidebar .sidebar-header #sidebarToggler {
  position: absolute;
  top: 1rem;
  right: 1rem;
  z-index: 1100;
}

.dashboard-sidebar.collapsed .sidebar-header h3 {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s;
}

.sidebar-header h3 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.sidebar-nav {
  padding: 1rem 0;
}

.sidebar-nav .nav-item {
  margin-bottom: 0.25rem;
}

.sidebar-nav .nav-link {
  color: var(--sidebar-text);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.sidebar-nav .nav-link i {
  margin-right: 0.75rem;
  width: 20px;
  text-align: center;
}

.sidebar-nav .nav-link:hover {
  background-color: var(--sidebar-hover);
  color: white;
  border-left-color: var(--sidebar-active);
}

.sidebar-nav .nav-link.active {
  background-color: var(--sidebar-hover);
  color: white;
  border-left-color: var(--sidebar-active);
  font-weight: 500;
}

/* Main Content Area */
.dashboard-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 1rem;
  background-color: #f3f4f6;
  min-height: 100vh;
}

/* Dashboard Cards */
.dashboard-main .card {
  border: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s, box-shadow 0.2s;
}

.dashboard-main .card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.dashboard-main .card-title {
  color: #4b5563;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.dashboard-main .card-text {
  color: #1f2937;
  font-weight: 700;
}

.dashboard-main .text-muted {
  color: #6b7280 !important;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .dashboard-sidebar {
    width: 0;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }
  
  .dashboard-main {
    margin-left: 0;
  }
  
  .dashboard-sidebar.show {
    width: var(--sidebar-width);
    transform: translateX(0);
  }
}