:root {
  --primary-color: #004a99;
  --secondary-color: #f39c12;
  --accent-color: #e74c3c;
  --bg-color: #f4f7f6;
  --text-color: #333;
  --white: #fff;
  --gray: #7f8c8d;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.main-content {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Header Styles */
.header-banner {
  background: linear-gradient(135deg, var(--primary-color), #002d5a);
  color: var(--white);
  padding: 1.5rem 2rem;
  text-align: center;
  position: relative;
  box-shadow: var(--shadow);
}

.header-banner h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  letter-spacing: 2px;
}

.header-banner p {
  font-size: 1.1rem;
  opacity: 0.9;
}

.summer-training {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.5rem 1.5rem;
  background-color: var(--secondary-color);
  color: #000;
  font-weight: bold;
  border-radius: 20px;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1rem;
}

.nav-links a {
  color: var(--white);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--secondary-color);
}

/* Footer Styles */
.footer {
  background-color: #2c3e50;
  color: var(--white);
  padding: 2rem;
  text-align: center;
  margin-top: auto;
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
}

/* Page Styles */
.page-container {
  background-color: var(--white);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.section-title {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--secondary-color);
  display: inline-block;
  padding-bottom: 0.5rem;
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
}

.btn {
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}

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

.btn-primary:hover {
  background-color: #003d7a;
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: #000;
}

/* Dashboard & Cards */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--white);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  border-left: 5px solid var(--primary-color);
}

/* Test UI */
.test-layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 2rem;
}

.question-sidebar {
  background: var(--white);
  padding: 1rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  max-height: 80vh;
  overflow-y: auto;
}

.question-numbers {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
}

.q-num {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #ddd;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
}

.q-num.active {
  background-color: var(--primary-color);
  color: var(--white);
  border-color: var(--primary-color);
}

.q-num.answered {
  background-color: #27ae60;
  color: var(--white);
  border-color: #27ae60;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .test-layout {
    grid-template-columns: 1fr;
  }
  .header-banner h1 {
    font-size: 1.8rem;
  }
  .nav-links {
    flex-wrap: wrap;
    gap: 1rem;
  }
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: 1.5rem;
}

.modal-content {
  background-color: var(--white);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2), 0 10px 10px -5px rgba(0, 0, 0, 0.08);
  max-width: 500px;
  width: 100%;
  text-align: center;
  animation: modalPop 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalPop {
  0% { transform: scale(0.9); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}