/* ===== Global Styles ===== */
body {
  font-family: system-ui, sans-serif;
  background: #f9fafb;
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===== Hidden State ===== */
.hidden {
  display: none !important;
}

/* ===== Top Navigation Bar ===== */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #1f2937;
  color: white;
  padding: 1rem 2rem;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.app-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-btn {
  padding: 0.5rem 1rem;
  background-color: #2f5050;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 0.95rem;
  cursor: pointer;
}

.nav-btn:hover {
  background-color: #1d3232;
}

.user-info {
  font-size: 0.95rem;
  color: #f3f4f6;
}

/* ===== Main Container ===== */
.container {
  flex: 1;
  padding: 2rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

h2 {
  text-align: center;
  font-size: 1.75rem;
  margin-bottom: 2rem;
}

/* ===== App Grid ===== */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  padding: 1rem 0;
}

.app-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
  text-align: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.app-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.app-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.app-card p {
  font-size: 1rem;
  color: #4b5563;
  margin-bottom: 1.5rem;
}

.quiz-start-btn {
  padding: 0.75rem 1.5rem;
  background-color: #2f5050;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
}

.quiz-start-btn:hover {
  background-color: #1d3232;
}