/* ==========================================================================
   Cybersecurity Awareness Exam System - Main Design System (CSS)
   Theme: High-Tech Cyber Security (Deep Indigo, Teal Neon, Glassmorphism)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  /* Color Palette */
  --bg-dark: #0b0f19;
  --bg-card: rgba(18, 26, 44, 0.75);
  --bg-card-hover: rgba(26, 38, 64, 0.85);
  --bg-input: #121929;
  --border-color: rgba(64, 93, 140, 0.25);
  --border-glow: rgba(0, 229, 255, 0.4);

  /* Brand Accents */
  --primary: #00e5ff;
  --primary-hover: #33ecff;
  --primary-glow: rgba(0, 229, 255, 0.25);
  --secondary: #6366f1;
  --accent: #a855f7;
  
  /* Status Colors */
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.3);
  --warning: #f59e0b;
  --warning-glow: rgba(245, 158, 11, 0.3);
  --danger: #ef4444;
  --danger-glow: rgba(239, 68, 68, 0.3);
  --info: #3b82f6;

  /* Typography */
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', 'Inter', system-ui, sans-serif;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* Layout */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-cyber: 0 10px 30px -10px rgba(0, 229, 255, 0.15);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(0, 229, 255, 0.08) 0%, transparent 40%),
    linear-gradient(to bottom, rgba(11, 15, 25, 0.95), #0b0f19);
  background-attachment: fixed;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: #ffffff;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Header Navbar */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: 0 0 15px var(--primary-glow);
}

.brand-title h1 {
  font-size: 1.15rem;
  line-height: 1.2;
  background: linear-gradient(90deg, #ffffff, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-title span {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* Header Controls */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mode-switcher {
  display: flex;
  background: rgba(18, 25, 41, 0.9);
  padding: 4px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.mode-btn {
  padding: 0.4rem 1.1rem;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.mode-btn.active {
  background: linear-gradient(135deg, var(--primary), #00b4d8);
  color: #050b14;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.lang-select {
  background: var(--bg-input);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  outline: none;
  cursor: pointer;
  transition: var(--transition-fast);
}

.lang-select:hover, .lang-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 8px var(--primary-glow);
}

/* Containers */
.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

/* Glass Cards */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  transition: var(--transition-normal);
}

.glass-card:hover {
  border-color: rgba(0, 229, 255, 0.35);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-normal);
  text-decoration: none;
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #00a8e8);
  color: #040912;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 229, 255, 0.4);
}

.btn-secondary {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border-color: rgba(99, 102, 241, 0.3);
}

.btn-secondary:hover {
  background: rgba(99, 102, 241, 0.3);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(0, 229, 255, 0.05);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: var(--danger);
  color: #ffffff;
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.85rem 2rem;
  font-size: 1rem;
  border-radius: var(--radius-md);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-single {
  background: rgba(59, 130, 246, 0.2);
  color: #93c5fd;
  border: 1px solid rgba(59, 130, 246, 0.4);
}

.badge-multiple {
  background: rgba(168, 85, 247, 0.2);
  color: #d8b4fe;
  border: 1px solid rgba(168, 85, 247, 0.4);
}

.badge-tf {
  background: rgba(16, 185, 129, 0.2);
  color: #6ee7b7;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

/* Inputs & Form Controls */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.7rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-family: var(--font-main);
  outline: none;
  transition: var(--transition-fast);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(5, 8, 15, 0.85);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: #111726;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 650px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 2rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
  transform: translateY(20px);
  transition: transform 0.25s ease;
}

.modal-overlay.active .modal-card {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.modal-close:hover {
  color: #ffffff;
}

/* Utility Animations */
@keyframes pulseGlow {
  0% { box-shadow: 0 0 5px var(--primary-glow); }
  50% { box-shadow: 0 0 20px var(--primary-glow); }
  100% { box-shadow: 0 0 5px var(--primary-glow); }
}

.fade-in {
  animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Responsive Media Queries (Mobile & Tablet Optimization)
   ========================================================================== */

@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    padding: 0.75rem 1rem;
    gap: 0.75rem;
  }

  .brand-container {
    width: 100%;
    justify-content: center;
    text-align: center;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
    gap: 0.5rem;
  }

  .mode-switcher {
    flex: 1;
    justify-content: center;
  }

  .mode-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.78rem;
    flex: 1;
    justify-content: center;
  }

  .lang-select {
    padding: 0.4rem 0.5rem;
    font-size: 0.8rem;
  }

  .container {
    padding: 0 0.85rem;
    margin: 1rem auto;
  }

  .glass-card {
    padding: 1.25rem 1rem;
    border-radius: var(--radius-md);
  }

  .btn {
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
  }

  .btn-lg {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
  }

  .modal-card {
    width: 95%;
    padding: 1.25rem 1rem;
    max-height: 85vh;
  }
}

@media (max-width: 480px) {
  .brand-title h1 {
    font-size: 1rem;
  }

  .brand-title span {
    font-size: 0.7rem;
  }

  .brand-logo {
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
  }

  .form-control {
    padding: 0.6rem 0.85rem;
    font-size: 0.85rem;
  }
}