/* === style.css === */
  /* Reset and base */
  *, *::before, *::after {
    box-sizing: border-box;
  }
  html {
    font-family: 'Inter', 'Poppins', sans-serif;
    font-size: 16px;
    scroll-behavior: smooth;
  }
  body {
    margin: 0;
    background: linear-gradient(135deg, #0f3460 0%, #16213e 100%);
    color: #e0e6f1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }
  a {
    color: #06b6d4;
    text-decoration: none;
    transition: color 0.3s ease;
  }
  a:hover, a:focus {
    color: #8b5cf6;
    outline: none;
  }
  main {
    flex-grow: 1;
    padding: 32px 16px 48px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
  }
  h1, h2, h3 {
    margin: 0 0 24px 0;
  }
  h1 {
    font-family: 'Poppins', sans-serif;
    font-weight: 800;
    font-size: 2.5rem;
    background: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  h2 {
    font-weight: 700;
    font-size: 1.8rem;
    border-bottom: 3px solid #06b6d4;
    padding-bottom: 8px;
  }
  p {
    line-height: 1.6;
    max-width: 700px;
  }
  button {
    cursor: pointer;
    border: none;
    border-radius: 12px;
    padding: 14px 28px;
    font-weight: 600;
    font-size: 1rem;
    background: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
    color: white;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 5px 12px rgba(8,27,58,0.75);
  }
  button:hover, button:focus {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(139, 92, 246, 0.6);
    outline: none;
  }
  /* Container cards - glass morphism */
  .card {
    background: rgba(16, 26, 49, 0.75);
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(8,27,58,0.7);
    margin-bottom: 32px;
    padding: 24px 32px;
  }
  /* Responsive Header */
  header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(7,18,38,0.95);
    padding: 12px 24px;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.7);
  }
  .logo {
    font-weight: 700;
    font-size: 1.5rem;
    color: #8b5cf6;
    user-select: none;
  }
  nav {
    display: flex;
    gap: 24px;
  }
  nav a {
    font-weight: 600;
    font-size: 1rem;
    padding: 8px 0;
    position: relative;
  }
  nav a.active, nav a:hover, nav a:focus {
    color: #8b5cf6;
  }
  /* Hamburger for mobile */
  .mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 32px;
    color: #8b5cf6;
    cursor: pointer;
    user-select: none;
  }
  /* Navigation mobile slide */
  .nav-mobile {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 60px;
    right: 0;
    width: 260px;
    max-width: 70vw;
    height: calc(100vh - 60px);
    background: rgba(7,18,38,0.98);
    padding: 24px;
    box-shadow: -4px 0 12px rgba(0,0,0,0.9);
    z-index: 1500;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }
  .nav-mobile.show {
    display: flex;
    transform: translateX(0%);
  }
  .nav-mobile a {
    padding: 16px 0;
    font-size: 1.2rem;
    border-bottom: 1px solid #2a2a5c;
    color: #a0a9c0;
  }
  .nav-mobile a.active {
    color: #8b5cf6;
    font-weight: 700;
    border-color: #8b5cf6;
  }
  /* Responsive Footer */
  footer {
    background: rgba(7,18,38,0.95);
    color: #7f8c8d;
    padding: 24px 20px;
    text-align: left;
    font-size: 0.9rem;
    user-select: none;
  }
  footer a {
    color: #06b6d4;
  }
  /* Stats Grid */
.stats-grid {
  display: grid;
  gap: 32px;
  margin-bottom: 32px;
}

/* For desktop/laptop: exactly 3 columns */
	@media (min-width: 768px) {
	  .stats-grid {
		grid-template-columns: repeat(3, 1fr);
	  }
	}

/* For tablets: 2 columns */
	@media (max-width: 767px) and (min-width: 481px) {
	  .stats-grid {
		grid-template-columns: repeat(2, 1fr);
	  }
	}

/* For phones: 1 column */
	@media (max-width: 480px) {
	  .stats-grid {
		grid-template-columns: 1fr;
	  }
	}
	
  .stat-card {
	background: rgba(139, 92, 246, 0.15);
	border-radius: 12px;
	padding: 24px 20px;
	text-align: center;
	user-select: none;
	box-shadow: 0 8px 24px rgba(8, 27, 58, 0.7);
	max-width: 300px;
	width: 100%;
	display: flex;
	flex-direction: column;
	justify-content: flex-start;
	align-items: center;
  }
  .stat-card button {
	margin-top: 24px; 
  }
  
  .stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: #8b5cf6;
    margin-bottom: 8px;
  }
  .stat-label {
    font-weight: 500;
    color: #cad6f2;
	margin-bottom: 0;     /* reset */
	margin-top: 8px;      /* small gap from title */
	flex-grow: 1;         /* fills vertical space */
  }
  /* Questions list */
  .questions-list {
    max-height: 350px;
    overflow-y: auto;
  }
  .question-fail {
    background: #271e47;
    margin-bottom: 12px;
    border-radius: 12px;
    padding: 16px 20px;
    color: #e0e6f1;
  }
  .question-fail strong {
    color: #eab308;
  }
  /* Practice test */
  .practice-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 760px;
    margin: 0 auto;
  }
  .question-text {
    font-weight: 600;
    font-size: 1.4rem;
  }
  .answers-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .answers-list button {
    background: rgba(16, 26, 49, 0.75);
    border: 2px solid transparent;
    padding: 12px 20px;
    border-radius: 12px;
    font-size: 1.2rem;
    color: #e0e6f1;
    text-align: left;
    transition: background-color 0.4s ease, border-color 0.4s ease;
  }
  .answers-list button:hover, .answers-list button:focus {
    background: rgba(139, 92, 246, 0.3);
    border-color: #8b5cf6;
    outline: none;
  }
  .answers-list button.correct {
    background: #16a34a;
    border-color: #22c55e;
    color: #d9f99d;
  }
  .answers-list button.incorrect {
    background: #dc2626;
    border-color: #f87171;
    color: #fee2e2;
  }
  .feedback {
    font-weight: 600;
    font-size: 1.1rem;
    margin-top: 12px;
    color: #a0aec0;
  }
  .feedback.correct {
    color: #22c55e;
  }
  .feedback.incorrect {
    color: #f87171;
  }
  /* End test summary */
  .test-summary {
    margin-top: 32px;
    text-align: center;
  }
  .test-summary h2 {
    margin-bottom: 16px;
  }
  .pass {
    color: #22c55e;
  }
  .fail {
    color: #f87171;
  }
  /* Responsive Layout */
  @media (max-width: 640px) {
    main {
      padding: 24px 12px 32px;
    }
    nav {
      display: none;
    }
    .mobile-toggle {
      display: block;
    }
  }
  @media (min-width: 641px) and (max-width: 1024px) {
    main {
      padding: 32px 24px 48px;
    }
  }
	@media (min-width: 641px) {
	  .nav-mobile,
	  .nav-mobile.show {
		display: none !important;
	  }
	  .mobile-toggle {
		display: none !important;
	  }
}
/* Support menu highlight */
	.highlight-link {
	  font-weight: 700;
	  color: #facc15; /* golden yellow */
	}
	.highlight-link:hover {
	  color: #fde68a;
	}	

/* Practice by Section - Responsive and polished layout */

	#practice-by-section {
	  display: none;
	  padding: 2rem 1rem;
	}

	#practice-by-section:not([hidden]) {
	  display: block;
	}

	#practice-by-section h2 {
	  color: white;
	  font-size: 2rem;
	  border-bottom: 2px solid #00BFFF;
	  margin-bottom: 2rem;
	  padding-bottom: 0.5rem;
	}
	#practice-by-section .stats-grid {
	  max-width: 960px;
	  margin-left: auto;
	  margin-right: auto;
	  align-items: stretch
	}
}