.content {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
  min-height: calc(100vh - 200px);
}

.container {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 12px;
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.subtitle {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.screen {
  display: none;
}

.screen.active {
  display: block;
}

input,
select,
textarea {
  width: 100%;
  padding: 0.875rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  margin-top: 0.5rem;
  font-family: inherit;
  transition: all 0.3s;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 3rem;
}

select:hover {
  border-color: var(--accent-color);
}

select option {
  padding: 0.75rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  background: var(--bg-primary);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

label {
  display: block;
  margin-top: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

button[type="submit"],
.btn-primary {
  width: 100%;
  padding: 1rem;
  background: var(--accent-color);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 1.75rem;
  transition: background 0.2s ease;
}

button[type="submit"]:hover,
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

button[type="submit"]:disabled {
  background: var(--text-tertiary);
  cursor: not-allowed;
  transform: none;
}

.loading-message {
  margin-top: 1.75rem;
  padding: 1.5rem;
  background: var(--bg-tertiary);
  border-left: 4px solid var(--accent-color);
  border-radius: 8px;
  text-align: center;
  color: var(--text-primary);
  display: none;
  font-weight: 500;
}

.loading-message.active {
  display: block;
}

.quiz-header {
  margin-bottom: 2.5rem;
}

.progress-container {
  width: 100%;
  height: 10px;
  background: var(--border-color);
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.progress-bar {
  height: 100%;
  background: var(--accent-color);
  transition: width 0.4s ease;
  width: 0%;
}

.question-counter {
  text-align: right;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
}

.question-text {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.options-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.option-btn {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  font-size: 1.05rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
  color: var(--text-primary);
  line-height: 1.5;
  position: relative;
}

.option-btn:hover:not(:disabled) {
  border-color: var(--accent-color);
  background: var(--accent-light);
  transform: translateX(6px);
}

.option-btn.selected {
  border-color: var(--accent-color);
  background: var(--accent-light);
  font-weight: 600;
}

.option-btn.correct {
  border-color: var(--success-color);
  background: var(--success-bg);
  color: var(--success-text);
  font-weight: 600;
}

.option-btn.incorrect {
  border-color: var(--error-color);
  background: var(--error-bg);
  color: var(--error-text);
  font-weight: 600;
}

.option-btn:disabled {
  cursor: not-allowed;
  opacity: 0.9;
}

.option-btn:disabled:hover {
  transform: none;
}

.quiz-actions {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
}

.btn-secondary {
  padding: 1rem 2.5rem;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-secondary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

.btn-secondary:disabled {
  background: var(--text-tertiary);
  cursor: not-allowed;
  transform: none;
}

/* Results Screen */
.results-container {
  text-align: center;
  padding: 2.5rem 0;
}

.results-container h2 {
  font-size: 2.25rem;
  color: var(--text-primary);
  margin-bottom: 2.5rem;
  font-weight: 700;
}

.score-display {
  display: flex;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.score-circle {
  width: 220px;
  height: 220px;
  border: 5px solid var(--accent-color);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--card-bg);
}

.score-number {
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--accent-color);
}

.score-label {
  font-size: 1.05rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 600;
}

.score-summary {
  background: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  padding: 2rem;
  margin-bottom: 2.5rem;
  color: var(--text-primary);
  line-height: 2;
  font-size: 1.05rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .content {
    padding: 1.5rem 1rem;
  }

  .container {
    padding: 2rem 1.5rem;
  }

  h1 {
    font-size: 1.875rem;
  }

  .question-text {
    font-size: 1.25rem;
  }

  .score-circle {
    width: 180px;
    height: 180px;
  }

  .score-number {
    font-size: 3rem;
  }

  .btn-secondary {
    padding: 0.875rem 2rem;
  }

  .option-btn:hover {
    transform: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 1.5rem 1rem;
  }

  h1 {
    font-size: 1.625rem;
  }

  .results-container h2 {
    font-size: 1.75rem;
  }

  .score-circle {
    width: 160px;
    height: 160px;
  }

  .score-number {
    font-size: 2.5rem;
  }

  .btn-secondary,
  .btn-primary {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
  }
}