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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  color: #e0e0e0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px 80px;
}

.container {
  width: 100%;
  max-width: 520px;
}

header {
  text-align: center;
  margin-bottom: 32px;
}

.site-logo {
  width: 64px;
  height: auto;
  margin-bottom: 12px;
  border-radius: 12px;
}

.title {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #f093fb, #f5576c, #4facfe);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: #a0a0c0;
  font-size: 0.95rem;
  margin-top: 4px;
}

.card {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 20px;
  padding: 36px 28px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 99px;
  margin-bottom: 8px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #4facfe, #00f2fe);
  border-radius: 99px;
  transition: width 0.5s ease;
}

.progress-text {
  font-size: 0.85rem;
  color: #9090b0;
  margin-bottom: 16px;
}

.score-display {
  margin-bottom: 20px;
  font-size: 0.95rem;
  color: #b0b0d0;
}

.btn {
  display: inline-block;
  border: none;
  border-radius: 12px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: linear-gradient(135deg, #4facfe, #00f2fe);
  color: #0f0c29;
  box-shadow: 0 4px 20px rgba(79, 172, 254, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(79, 172, 254, 0.5);
  transform: translateY(-2px);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-success {
  background: linear-gradient(135deg, #43e97b, #38f9d7);
  color: #0f0c29;
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(67, 233, 123, 0.4);
}

.btn-skip {
  background: rgba(255, 255, 255, 0.08);
  color: #a0a0c0;
  border: 1px solid rgba(255, 255, 255, 0.10);
}

.btn-skip:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #e0e0e0;
}

.question {
  margin-top: 20px;
  animation: fadeIn 0.35s ease;
}

.question-prompt {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: #d0d0e8;
}

input[type="text"] {
  width: 100%;
  padding: 14px 18px;
  font-size: 1rem;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  color: #e0e0e0;
  outline: none;
  transition: border-color 0.2s ease;
  margin-bottom: 12px;
}

input[type="text"]::placeholder {
  color: #707090;
}

input[type="text"]:focus {
  border-color: #4facfe;
  box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.15);
}

.question-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.hint {
  margin-top: 10px;
  font-size: 0.8rem;
  color: #606080;
}

kbd {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.8rem;
  font-family: inherit;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  color: #a0a0c0;
}

.result {
  margin-top: 20px;
  font-size: 1.3rem;
  font-weight: 700;
  min-height: 2rem;
}

.result.correct {
  color: #43e97b;
  animation: popIn 0.35s ease;
}

.result.incorrect {
  color: #f5576c;
  animation: shake 0.4s ease;
}

.credits {
  margin-top: 24px;
}

.credits-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #f093fb, #f5576c);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.credits-score {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: #b0b0d0;
}

.credits-list {
  list-style: none;
  margin-bottom: 24px;
}

.credits-list li {
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  color: #c0c0d8;
  font-size: 0.95rem;
}

.credits-list li:last-child {
  border-bottom: none;
}

footer {
  margin-top: 32px;
  font-size: 0.8rem;
  color: #505070;
  text-align: center;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes popIn {
  0%   { opacity: 0; transform: scale(0.7); }
  70%  { transform: scale(1.1); }
  100% { opacity: 1; transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%      { transform: translateX(-8px); }
  40%      { transform: translateX(8px); }
  60%      { transform: translateX(-5px); }
  80%      { transform: translateX(5px); }
}

@media (max-width: 480px) {
  body {
    padding: 24px 16px 80px;
  }

  .card {
    padding: 24px 16px;
  }

  .title {
    font-size: 1.6rem;
  }

  .btn {
    width: 100%;
  }

  .question-actions {
    flex-direction: column;
  }
}