:root {
  /* Dynamic Fallback Theme (Cute Flowers default) */
  --bg-primary: #fff0f5;
  --bg-secondary: #ffb6c1;
  --bg-gradient: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-shadow: 0 8px 32px rgba(255, 182, 193, 0.4);
  --card-border: rgba(255, 255, 255, 1);
  --card-radius: 24px;
  
  --text-primary: #2d3436;
  --text-secondary: #636e72;
  --accent-primary: #ff69b4;
  --accent-hover: #ff1493;
  
  --input-bg: rgba(255, 255, 255, 0.9);
  --input-border: #ff69b4;
  --input-text: #2d3436;
  
  --font-family: 'Nunito', sans-serif;
  --button-radius: 30px;
  --button-text: #fff;
  --sticker-opacity: 0.8;
  --card-backdrop: blur(12px);
  --transition-speed: 0.3s;
}

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

body {
  font-family: var(--font-family);
  background: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  transition: background var(--transition-speed) ease;
  overflow-x: hidden;
  padding: 40px 0;
}

.app-container {
  width: 100%;
  max-width: 900px;
  padding: 0 20px;
  position: relative;
  z-index: 10;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 2rem;
  background: var(--card-bg);
  backdrop-filter: var(--card-backdrop);
  padding: 20px;
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  border: 2px solid var(--card-border);
}

header h1 {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
}

header p {
  color: var(--text-secondary);
  font-size: 1.2rem;
}

.config-panel {
  display: flex;
  gap: 20px;
  background: var(--card-bg);
  backdrop-filter: var(--card-backdrop);
  padding: 30px;
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  border: 2px solid var(--card-border);
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.config-group {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 140px;
}

.config-group label {
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
  font-size: 1.2rem;
}

select {
  height: 56px;
  padding: 10px 15px;
  border-radius: 12px;
  border: 2px solid var(--input-border);
  background: var(--input-bg);
  color: var(--input-text);
  font-family: inherit;
  font-size: 1.2rem;
  font-weight: 600;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-speed);
}

select:focus {
  border-color: var(--accent-hover);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.primary-btn {
  background: var(--accent-primary);
  color: var(--button-text);
  border: none;
  height: 56px;
  padding: 0 40px;
  font-size: 1.3rem;
  font-weight: 800;
  border-radius: var(--button-radius);
  cursor: pointer;
  transition: all var(--transition-speed);
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  min-width: 160px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.primary-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.primary-btn:active {
  transform: translateY(1px);
}

.secondary-btn {
  background: var(--card-bg);
  color: var(--accent-primary);
  border: 2px solid var(--accent-primary);
  height: 56px;
  padding: 0 30px;
  font-size: 1.2rem;
  font-weight: 800;
  border-radius: var(--button-radius);
  cursor: pointer;
  transition: all var(--transition-speed);
}
.secondary-btn:hover {
  background: var(--bg-secondary);
}

.error-message {
  background: #ff7675;
  color: white;
  padding: 15px;
  border-radius: 12px;
  margin-bottom: 20px;
  text-align: center;
  font-weight: bold;
  font-size: 1.2rem;
  box-shadow: 0 4px 15px rgba(255, 118, 117, 0.4);
}

.hidden {
  display: none !important;
}

.questions-section {
  display: flex;
  flex-direction: column;
  gap: 20px;
  background: transparent; /* Changed to let cards pop on background */
}

.questions-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 30px;
}

.question-item {
  display: flex;
  align-items: center;
  background: var(--card-bg);
  backdrop-filter: var(--card-backdrop);
  padding: 25px 30px;
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  border: 2px solid var(--card-border);
  transition: border-color 0.3s;
  justify-content: space-between;
}

.question-item:hover {
  border-color: var(--accent-primary);
}

.question-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-primary);
  color: var(--button-text);
  font-size: 1.3rem;
  font-weight: 900;
  min-width: 48px;
  height: 48px;
  border-radius: 24px;
  margin-right: 20px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.question-text {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--card-text-contrast, var(--text-primary));
  margin-right: 20px;
  flex: 1;
  text-align: right;
  letter-spacing: 2px;
  text-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

.question-input {
  width: 140px;
  height: 60px;
  padding: 10px;
  font-size: 2.2rem;
  text-align: center;
  border: 4px solid var(--input-border);
  border-radius: 12px;
  background: var(--input-bg);
  color: var(--input-text-contrast, #1f2937);
  font-weight: 700;
  letter-spacing: 3px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
  text-shadow: none;
}

.question-input::placeholder {
  color: var(--input-text-contrast, #1f2937);
  opacity: 0.35;
}

.question-input:focus {
  border-color: var(--accent-hover);
  box-shadow: 0 0 0 4px var(--accent-primary);
}

.question-feedback {
  margin-left: 20px;
  font-size: 2rem;
  width: 40px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.correct {
  color: #00b894;
}

.wrong {
  color: #d63031;
}

.action-footer {
  text-align: center;
  margin: 30px 0 50px 0;
}

.submit-btn {
  width: 100%;
  max-width: 400px;
  height: 70px;
  font-size: 1.8rem;
  border-radius: 35px;
}

.result-section {
  text-align: center;
  background: var(--card-bg);
  backdrop-filter: var(--card-backdrop);
  padding: 50px 30px;
  border-radius: 32px;
  box-shadow: var(--card-shadow);
  border: 4px solid var(--accent-primary);
  margin-top: 30px;
}

.score-card h2 {
  font-size: 6rem;
  color: var(--accent-hover);
  margin-bottom: 15px;
  font-weight: 900;
  text-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.score-card p {
  font-size: 2rem;
  font-weight: bold;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.error-list-container {
  margin: 30px 0;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 16px;
  padding: 20px;
  text-align: left;
}

.error-list-container h3 {
  font-size: 1.5rem;
  color: #d63031;
  margin-bottom: 15px;
  text-align: center;
  font-weight: bold;
}

.error-list {
  list-style: none;
  font-size: 1.3rem;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  font-weight: bold;
}

.error-list li {
  padding: 8px 16px;
  background: rgba(214, 48, 49, 0.1);
  border-radius: 8px;
  border: 1px dashed #d63031;
}

.restart-btn {
  font-size: 1.5rem;
  height: 60px;
  max-width: 300px;
  width: 100%;
  border-radius: 30px;
}

.sticker-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.sticker {
  position: absolute;
  opacity: var(--sticker-opacity);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(10deg); }
  100% { transform: translateY(0px) rotate(0deg); }
}

@media (max-width: 820px) {
  .config-panel {
    flex-direction: column;
    align-items: stretch;
  }
  .question-item {
    flex-direction: column;
    text-align: center;
    gap: 15px;
  }
  .question-badge {
    margin-right: 0;
  }
  .question-text {
    margin-right: 0;
    text-align: center;
  }
  .question-feedback {
    margin-left: 0;
  }
}