* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Inter", Arial, sans-serif;
}

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #f8fafc, #e5e7eb);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

/* Quiz Logo */
.quiz-logo {
  width: 120px;
  height: auto;
  margin-bottom: 20px;
}

/* Container */
.quiz-container {
  background: #ffffff;
  padding: 32px;
  width: 100%;
  max-width: 520px;
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.14);
  text-align: center;
}

/* Title */
.title {
  margin-bottom: 18px;
  color: #111827;
  font-size: 28px;
  font-weight: 700;
}

/* Progress text */
#progress-text {
  margin-bottom: 10px;
  color: #374151;
  font-size: 14px;
  font-weight: 600;
}

/* Progress Bar */
#progress-bar-container {
  width: 100%;
  height: 10px;
  background: #e5e7eb;
  border-radius: 999px;
  margin-bottom: 28px;
  overflow: hidden;
}

#progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #374151, #111827);
  transition: width 0.35s ease;
}

/* Question */
.question-box {
  margin-bottom: 24px;
}

#question {
  font-size: 20px;
  line-height: 1.5;
  color: #1f2937;
  font-weight: 600;
}

/* Answers */
.answers {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.answer-btn {
  padding: 14px 16px;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: #f8fafc;
  color: #111827;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  transition: 0.25s ease;
}

.answer-btn:hover:not(:disabled) {
  background: #f3f4f6;
  border-color: #1f2937;
  transform: translateY(-1px);
}

.answer-btn:disabled {
  cursor: not-allowed;
}

/* Answer states */
.correct {
  background: #22c55e !important;
  border-color: #22c55e !important;
  color: #ffffff !important;
}

.wrong {
  background: #ef4444 !important;
  border-color: #ef4444 !important;
  color: #ffffff !important;
}

.selected {
  outline: 2px solid #1f2937;
}

/* Controls */
.controls {
  margin-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.prev-next,
.reset {
  width: auto;
  float: none;
  display: flex;
  gap: 10px;
}

#next-btn,
#prev-btn {
  padding: 11px 18px;
  border: none;
  background: #1f2937;
  color: #ffffff;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: 0.25s ease;
}

#reset-btn {
  padding: 11px 18px;
  border: none;
  background: #ef4444;
  color: white;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: 0.25s ease;
}

#next-btn:hover:not(:disabled),
#prev-btn:hover:not(:disabled) {
  background: #111827;
  transform: translateY(-1px);
}

#reset-btn:hover:not(:disabled) {
  background: #dc2626;
  transform: translateY(-1px);
}

#next-btn:disabled,
#prev-btn:disabled {
  background: #d1d5db !important;
  color: #6b7280;
  cursor: not-allowed;
  transform: none;
}

.prev-btn-disabled {
  background: #d1d5db !important;
  color: #6b7280 !important;
}

/* Shake animation */
@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  50% { transform: translateX(6px); }
  75% { transform: translateX(-6px); }
  100% { transform: translateX(0); }
}

.shake {
  animation: shake 0.3s;
}

.footer{
    margin-top:30px;
    padding-top:20px;

    border-top:1px solid #e5e7eb;

    display:flex;
    flex-direction:column;
    gap:6px;

    text-align:center;
}

.footer p{
    color:#374151;
    font-size:13px;
    font-weight:500;
}

.footer a{
    color:#111827;
    text-decoration:none;
}
.footer strong{
    color:#111827;
}

.footer span{
    color:#9ca3af;
    font-size:12px;
    letter-spacing:.5px;
}

/* Responsive Design */

/* Tablets */
@media (max-width: 768px) {
  body {
    padding: 40px 20px;
  }

  .quiz-container {
    max-width: 480px;
    padding: 28px;
  }

  .title {
    font-size: 26px;
  }

  #question {
    font-size: 19px;
  }
}

/* Mobile */
@media (max-width: 480px) {
  body {
    padding: 24px 16px;
  }

  .quiz-container {
    padding: 24px 20px;
    border-radius: 16px;
  }

  .title {
    font-size: 24px;
  }

  #progress-text {
    font-size: 13px;
  }

  #question {
    font-size: 18px;
  }

  .answer-btn {
    padding: 13px 14px;
    font-size: 14px;
  }

  .controls {
    flex-direction: column;
    gap: 14px;
  }

  .prev-next,
  .reset {
    width: 100%;
    justify-content: center;
  }

  #next-btn,
  #prev-btn,
  #reset-btn {
    width: 100%;
  }

  .prev-next {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}

/* Small phones */
@media (max-width: 360px) {
  .quiz-container {
    padding: 20px 16px;
  }

  .title {
    font-size: 22px;
  }

  #question {
    font-size: 17px;
  }

  .prev-next {
    grid-template-columns: 1fr;
  }
}