/* ============================================= */
/* === Modern Quiz Styles with Visual Flair === */
/* ============================================= */

:root {
  /* Color Palette */
  --primary: #4361ee;
  --primary-dark: #3a0ca3;
  --secondary: #4cc9f0;
  --success: #2ecc71;
  --danger: #e63946;
  --warning: #ffbe0b;
  --light: #f8f9fa;
  --dark: #212529;
  --gray: #6c757d;
  --light-gray: #e9ecef;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.1);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ==================== */
/* === Base Styles === */
/* ==================== */

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: var(--dark);
  background-color: #f5f7ff;
  background-image: url('data:image/svg+xml;utf8,<svg width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><path d="M30 10L50 30L70 10" fill="none" stroke="%234361ee" stroke-width="0.5" stroke-opacity="0.1"/></svg>');
  background-size: 120px;
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

/* ======================= */
/* === Layout Containers === */
/* ======================= */

.math-quiz-container {
  background-color: white;
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  margin: var(--space-xl) auto;
  box-shadow: var(--shadow-lg);
  max-width: 1000px;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.math-quiz-container::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  z-index: 2;
}

/* =================== */
/* === Typography === */
/* =================== */

.section-title h2 {
  color: var(--primary-dark);
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--primary);
  border-radius: 3px;
}

/* ======================= */
/* === Status Elements === */
/* ======================= */

.section-status {
  background-color: var(--primary);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-lg);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.section-status.completed {
  background-color: var(--success);
  box-shadow: 0 0 0 2px white, 0 0 0 4px var(--success);
}

/* ====================== */
/* === Question Grid === */
/* ====================== */

.question-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

/* ===================== */
/* === Question Cards === */
/* ===================== */

.question-card {
  background-color: white;
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--light-gray);
  transition: all var(--transition-normal);
  position: relative;
}

.question-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--primary);
}

.question-card h3 {
  color: var(--primary);
  margin-top: 0;
  margin-bottom: var(--space-md);
  font-size: 1.2rem;
  font-weight: 600;
}

.question {
  font-size: 1rem;
  margin-bottom: var(--space-lg);
  font-weight: 500;
  line-height: 1.6;
  color: var(--dark);
}

/* ======================== */
/* === Form Components === */
/* ======================== */

.input-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  align-items: center;
}

input[type="number"] {
  padding: var(--space-md);
  border: 1px solid var(--light-gray);
  border-radius: var(--radius-md);
  flex-grow: 1;
  font-size: 1rem;
  transition: all var(--transition-fast);
  min-width: 120px;
}

input[type="number"]:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

button {
  padding: var(--space-md) var(--space-lg);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

button::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -60%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    to right,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(255, 255, 255, 0) 100%
  );
  transform: rotate(30deg);
  transition: all var(--transition-slow);
}

button:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

button:hover::after {
  left: 100%;
}

/* ===================== */
/* === Feedback UI === */
/* ===================== */

.feedback {
  margin-top: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 500;
  min-height: 20px;
  border-left: 4px solid transparent;
}

.feedback.correct {
  background-color: rgba(46, 204, 113, 0.1);
  border-left-color: var(--success);
  color: #155724;
}

.feedback.incorrect {
  background-color: rgba(230, 57, 70, 0.1);
  border-left-color: var(--danger);
  color: #721c24;
}

/* ====================== */
/* === Progress Bar === */
/* ====================== */

.progress-container {
  margin: var(--space-lg) 0 0;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
  color: var(--gray);
}

.progress-bar {
  height: 10px;
  background-color: var(--light-gray);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}

.progress {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--success));
  width: 0%;
  transition: width var(--transition-slow);
  position: relative;
}

.progress::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    to right,
    rgba(255,255,255,0) 0%,
    rgba(255,255,255,0.3) 50%,
    rgba(255,255,255,0) 100%
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ========================== */
/* === Recall Questions === */
/* ========================== */

.recall-card {
  grid-column: 1 / -1;
  background-color: #f8fafc;
  border: 1px dashed var(--primary);
}

#recall-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin: var(--space-md) 0;
}

.recall-option {
  display: flex;
  align-items: center;
  padding: var(--space-md);
  background: white;
  border-radius: var(--radius-md);
  border: 1px solid var(--light-gray);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.recall-option:hover {
  background: #f8fafc;
  border-color: var(--primary);
  transform: translateX(5px);
}

.recall-option input[type="radio"] {
  margin-right: var(--space-md);
  accent-color: var(--primary);
}

/* ========================= */
/* === Final Submission === */
/* ========================= */

#final-submission {
  display: block;
  width: 100%;
  max-width: 300px;
  padding: var(--space-md) var(--space-xl);
  background: var(--gray);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: not-allowed;
  margin: var(--space-xl) auto 0;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  text-transform: uppercase;
  letter-spacing: 1px;
}

#final-submission:not(:disabled) {
  background: linear-gradient(135deg, var(--success), #27ae60);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  animation: pulse 1.5s infinite, float 3s ease-in-out infinite;
}

#final-submission:not(:disabled):hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

#final-submission:not(:disabled)::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -60%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    to right,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.2) 50%,
    rgba(255, 255, 255, 0) 100%
  );
  transform: rotate(30deg);
  transition: all var(--transition-slow);
}

#final-submission:not(:disabled):hover::after {
  left: 100%;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(46, 204, 113, 0.4); }
  70% { box-shadow: 0 0 0 15px rgba(46, 204, 113, 0); }
  100% { box-shadow: 0 0 0 0 rgba(46, 204, 113, 0); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

#final-submission::before {
  content: "✓";
  display: inline-block;
  margin-right: var(--space-sm);
  font-size: 1.2em;
  vertical-align: middle;
}

/* ======================== */
/* === Utility Classes === */
/* ======================== */

.hidden {
  display: none !important;
}

.disabled-card {
  opacity: 0.7;
  pointer-events: none;
  position: relative;
}

.disabled-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255,255,255,0.7);
  z-index: 1;
}

/* ======================== */
/* === Responsive Design === */
/* ======================== */

@media (max-width: 768px) {
  .math-quiz-container {
    padding: var(--space-lg);
    margin: var(--space-lg) auto;
    border-radius: var(--radius-lg);
  }
  
  .question-section {
    grid-template-columns: 1fr;
  }
  
  .input-group {
    flex-direction: column;
    align-items: stretch;
  }
  
  button {
    margin-left: 0;
    margin-top: var(--space-sm);
    width: 100%;
  }
  
  .section-title {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

/* ===================== */
/* === Animations === */
/* ===================== */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.question-card {
  animation: fadeIn 0.5s ease forwards;
}

/* ==================== */
/* === SVG Decor === */
/* ==================== */

.decorative-circle {
  position: absolute;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(67,97,238,0.1) 0%, rgba(67,97,238,0) 70%);
  border-radius: 50%;
  z-index: -1;
}

.decorative-circle.top-right {
  top: -50px;
  right: -50px;
}

.decorative-circle.bottom-left {
  bottom: -50px;
  left: -50px;
}