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

:root {
  /* Light Theme - Clean & Professional */
  --bg-color: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
  --bg-secondary: #ffffff;
  --text-color: #1a202c;
  --text-light: #4a5568;
  --card-bg: rgba(255, 255, 255, 0.95);
  --border-color: rgba(226, 232, 240, 0.8);

  /* Professional Palette */
  --primary-color: #4a90e2;
  --primary-light: #7bb3f0;
  --secondary-color: #38b2ac;
  --accent-color: #ed8936;
  --success-color: #48bb78;
  --warning-color: #ed8936;
  --danger-color: #e53e3e;
  --info-color: #4299e1;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-success: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
  --gradient-warning: linear-gradient(135deg, #ed8936 0%, #dd6b20 100%);
  --gradient-info: linear-gradient(135deg, #4299e1 0%, #3182ce 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.9) 100%);

  /* Shadows & Effects */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 25px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 15px 35px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);

  /* Animations */
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

[data-theme="dark"] {
  /* Dark Theme - Enhanced Contrast */
  --bg-color: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
  --bg-secondary: #1a202c;
  --text-color: #f7fafc;
  --text-light: #e2e8f0;
  --card-bg: rgba(45, 55, 72, 0.95);
  --border-color: rgba(113, 128, 150, 0.3);

  --primary-color: #63b3ed;
  --primary-light: #90cdf4;
  --secondary-color: #4fd1c7;
  --accent-color: #f6ad55;
  --success-color: #68d391;
  --warning-color: #f6ad55;
  --danger-color: #fc8181;
  --info-color: #63b3ed;

  --gradient-primary: linear-gradient(135deg, #c4b5fd 0%, #a78bfa 100%);
  --gradient-success: linear-gradient(135deg, #86efac 0%, #4ade80 100%);
  --gradient-warning: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  --gradient-info: linear-gradient(135deg, #7dd3fc 0%, #38bdf8 100%);
  --gradient-card: linear-gradient(145deg, rgba(30,41,59,0.95) 0%, rgba(51,65,85,0.9) 100%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 25px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 15px 35px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(196, 181, 253, 0.3);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: var(--transition-smooth);
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-secondary);
  z-index: -1;
  opacity: 0.1;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
  position: relative;
  z-index: 1;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-light);
}

header {
  margin-bottom: 40px;
  position: relative;
}

.header-top {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 24px 32px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.header-top::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0.6;
}

.header-top:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

header h1 {
  color: var(--primary-color);
  font-size: 2.5rem;
  font-weight: 800;
  margin: 0;
  letter-spacing: -0.02em;
  animation: fadeInUp 0.8s ease-out;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}



.theme-toggle {
  background: var(--gradient-primary);
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  cursor: pointer;
  font-size: 1.4rem;
  color: white;
  transition: var(--transition-bounce);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  transform: scale(1.1) rotate(15deg);
  box-shadow: var(--shadow-glow);
}

.theme-toggle:active {
  transform: scale(0.95);
}

nav {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 8px;
  display: flex;
  justify-content: center;
  gap: 4px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

nav::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-primary);
  opacity: 0.05;
  z-index: 0;
}

.nav-btn {
  position: relative;
  z-index: 1;
  padding: 14px 28px;
  border: none;
  background: transparent;
  color: var(--text-color);
  border-radius: 16px;
  cursor: pointer;
  transition: var(--transition-smooth);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  min-width: 140px;
  text-align: center;
}

.nav-btn:hover {
  background: rgba(102, 126, 234, 0.1);
  transform: translateY(-1px);
  color: var(--primary-color);
}

.nav-btn.active {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.nav-btn.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(255,255,255,0.2) 0%, transparent 100%);
  border-radius: 16px;
}

.page {
  display: none;
  animation: fadeIn 0.5s ease-out;
}

.page.active {
  display: block;
}

.gpa-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.gpa-card {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  padding: 32px 24px;
  border-radius: 24px;
  box-shadow: var(--shadow-md);
  text-align: center;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
  cursor: pointer;
}

.gpa-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
}

.gpa-card:nth-child(1)::before {
  background: var(--gradient-success);
}

.gpa-card:nth-child(2)::before {
  background: var(--gradient-info);
}

.gpa-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.gpa-card h3 {
  color: var(--text-light);
  margin-bottom: 16px;
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.gpa-value {
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  transition: var(--transition-smooth);
  /* Fallback for better visibility */
  color: var(--primary-color);
}

.gpa-card:nth-child(1) .gpa-value {
  background: var(--gradient-success);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  /* Fallback for better visibility */
  color: var(--success-color);
}

.gpa-card:nth-child(2) .gpa-value {
  background: var(--gradient-info);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  /* Fallback for better visibility */
  color: var(--info-color);
}

.semester-selector {
  margin-bottom: 40px;
  text-align: center;
}

.semester-selector label {
  display: block;
  margin-bottom: 12px;
  font-weight: 600;
  color: var(--text-color);
  font-size: 1.1rem;
}

.semester-selector select {
  width: 100%;
  max-width: 320px;
  padding: 16px 20px;
  border: 2px solid var(--border-color);
  border-radius: 16px;
  font-size: 1rem;
  font-weight: 500;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  color: var(--text-color);
  transition: var(--transition-smooth);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 16px center;
  background-size: 16px;
  padding-right: 48px;
}

.semester-selector select:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.semester-selector select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.semester-selector select option {
  background: var(--card-bg);
  color: var(--text-color);
  padding: 12px 16px;
  border: none;
}

.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.subject-card {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  padding: 24px;
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.subject-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: var(--transition-smooth);
}

.subject-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.subject-card:hover::before {
  transform: scaleX(1);
}

.subject-card h4 {
  color: var(--text-color);
  margin-bottom: 12px;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.3;
}

.subject-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
  font-size: 0.9rem;
  color: var(--text-light);
  font-weight: 500;
}

.grade-select {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--border-color);
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 500;
  background: var(--card-bg);
  color: var(--text-color);
  margin-bottom: 16px;
  transition: var(--transition-smooth);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 16px center;
  background-size: 16px;
  padding-right: 48px;
}

.grade-select:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.grade-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.grade-select option {
  background: var(--card-bg);
  color: var(--text-color);
  padding: 12px 16px;
  border: none;
}

.grade-points {
  text-align: right;
  font-weight: 700;
  font-size: 1.1rem;
  background: var(--gradient-success);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  /* Fallback for better visibility */
  color: var(--success-color);
}

.actions {
  text-align: center;
  margin-top: 40px;
}

.btn-secondary {
  padding: 14px 28px;
  border: none;
  background: var(--gradient-warning);
  color: white;
  border-radius: 16px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition-bounce);
  box-shadow: var(--shadow-sm);
  letter-spacing: 0.02em;
  position: relative;
  overflow: hidden;
}

.btn-secondary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover::before {
  left: 100%;
}

.btn-secondary:active {
  transform: translateY(0) scale(0.98);
}

/* Simulator Styles */
.simulator-controls {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  padding: 32px;
  border-radius: 24px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  margin-bottom: 32px;
  transition: var(--transition-smooth);
}

.simulator-controls:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.simulator-controls h2 {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  margin-bottom: 8px;
  /* Fallback for better visibility */
  color: var(--primary-color);
}

.simulator-controls p {
  color: var(--text-light);
  margin-bottom: 24px;
  font-size: 1.1rem;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  margin-bottom: 12px;
  font-weight: 600;
  color: var(--text-color);
  font-size: 1rem;
}

.form-group select {
  width: 100%;
  padding: 16px 20px;
  border: 2px solid var(--border-color);
  border-radius: 16px;
  font-size: 1rem;
  font-weight: 500;
  background: var(--card-bg);
  color: var(--text-color);
  transition: var(--transition-smooth);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 16px center;
  background-size: 16px;
  padding-right: 48px;
}

.form-group select:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group select option {
  background: var(--card-bg);
  color: var(--text-color);
  padding: 12px 16px;
  border: none;
}

.simulation-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.sim-result {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  padding: 24px;
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  text-align: center;
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.sim-result::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-info);
}

.sim-result:nth-child(2)::before {
  background: var(--gradient-success);
}

.sim-result:nth-child(3)::before {
  background: var(--gradient-warning);
}

.sim-result:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.sim-result h4 {
  color: var(--text-light);
  margin-bottom: 12px;
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sim-value {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  /* Fallback for better visibility */
  color: var(--primary-color);
}

/* Analytics Styles */
.analytics-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.analytics-card {
  color: white;
  padding: 28px 24px;
  border-radius: 24px;
  text-align: center;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
  cursor: pointer;
}

.analytics-card:nth-child(1) {
  background: var(--gradient-primary);
}

.analytics-card:nth-child(2) {
  background: var(--gradient-success);
}

.analytics-card:nth-child(3) {
  background: var(--gradient-warning);
}

.analytics-card:nth-child(4) {
  background: var(--gradient-info);
}

.analytics-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, transparent 100%);
  opacity: 0;
  transition: var(--transition-smooth);
}

.analytics-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.analytics-card:hover::before {
  opacity: 1;
}

.analytics-card h4 {
  margin-bottom: 16px;
  font-size: 1rem;
  opacity: 0.95;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.analytics-value {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 8px;
  text-shadow: 2px 2px 6px rgba(0,0,0,0.4);
}

.analytics-card small {
  opacity: 0.9;
  font-size: 0.875rem;
  font-weight: 500;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
}

.charts-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
  gap: 32px;
  margin-bottom: 40px;
}

.chart-container {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  padding: 32px;
  border-radius: 24px;
  box-shadow: var(--shadow-md);
  text-align: center;
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.chart-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
}

.chart-container:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.chart-container h3 {
  margin-bottom: 24px;
  color: var(--text-color) !important;
  font-size: 1.4rem;
  font-weight: 700;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

/* Ensure chart titles are visible in both themes */
[data-theme="dark"] .chart-container h3 {
  color: var(--text-color) !important;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
}

.detailed-analytics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.stat-card {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  padding: 28px;
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-info);
  transform: scaleX(0);
  transition: var(--transition-smooth);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat-card:hover::before {
  transform: scaleX(1);
}

.stat-card h4 {
  color: var(--text-color);
  margin-bottom: 20px;
  font-size: 1.3rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.2);
  border-bottom: 2px solid rgba(102, 126, 234, 0.2);
  padding-bottom: 12px;
}

.trend-item, .category-item, .forecast-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding: 16px;
  background: rgba(102, 126, 234, 0.05);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

.trend-item:hover, .category-item:hover, .forecast-item:hover {
  background: rgba(102, 126, 234, 0.1);
  transform: translateX(4px);
}

.trend-item:last-child, .category-item:last-child, .forecast-item:last-child {
  margin-bottom: 0;
}

.trend-item span:first-child, .category-item span:first-child, .forecast-item span:first-child {
  color: var(--text-color);
  font-weight: 500;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

.category-item span:last-child {
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 1.1rem;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
  border: 2px solid rgba(102, 126, 234, 0.3);
  padding: 4px 8px;
  border-radius: 8px;
}

.forecast-item span:last-child {
  font-weight: 700;
  background: var(--gradient-success);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 1.1rem;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
  border: 2px solid rgba(72, 187, 120, 0.3);
  padding: 4px 8px;
  border-radius: 8px;
}

.trend-item span:last-child {
  font-weight: 700;
  background: var(--gradient-info);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 1.1rem;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
  border: 2px solid rgba(66, 153, 225, 0.3);
  padding: 4px 8px;
  border-radius: 8px;
}

/* Enhanced Analytics Cards */
.subject-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  margin-bottom: 12px;
  border-radius: 16px;
  transition: var(--transition-smooth);
  border: 1px solid var(--border-color);
}

.weak-subject {
  background: linear-gradient(135deg, rgba(245, 101, 101, 0.1) 0%, rgba(252, 129, 129, 0.05) 100%);
  border-left: 4px solid #f56565;
}

.top-subject {
  background: linear-gradient(135deg, rgba(72, 187, 120, 0.1) 0%, rgba(104, 211, 145, 0.05) 100%);
  border-left: 4px solid #48bb78;
}

.subject-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

.subject-rank {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: white;
  flex-shrink: 0;
}

.weak-subject .subject-rank {
  background: var(--gradient-warning);
}

.top-subject .subject-rank {
  background: var(--gradient-success);
}

.subject-details {
  flex: 1;
}

.subject-name {
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 4px;
  font-size: 1rem;
}

.subject-meta {
  font-size: 0.85rem;
  color: var(--text-light);
  font-weight: 500;
}

.subject-grade {
  padding: 8px 16px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.9rem;
  text-align: center;
  min-width: 60px;
}

/* Grade-specific colors */
.grade-aplus {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.grade-a {
  background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(72, 187, 120, 0.3);
}

.grade-aminus {
  background: linear-gradient(135deg, #68d391 0%, #48bb78 100%);
  color: white;
}

.grade-bplus {
  background: linear-gradient(135deg, #4299e1 0%, #3182ce 100%);
  color: white;
}

.grade-b {
  background: linear-gradient(135deg, #63b3ed 0%, #4299e1 100%);
  color: white;
}

.grade-bminus {
  background: linear-gradient(135deg, #90cdf4 0%, #63b3ed 100%);
  color: white;
}

.grade-cplus, .grade-c, .grade-cminus {
  background: linear-gradient(135deg, #ed8936 0%, #dd6b20 100%);
  color: white;
}

.grade-dplus, .grade-d, .grade-f {
  background: linear-gradient(135deg, #f56565 0%, #e53e3e 100%);
  color: white;
}

/* Semester Summary Cards */
.semester-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  margin-bottom: 12px;
  border-radius: 16px;
  transition: var(--transition-smooth);
  border: 1px solid var(--border-color);
}

.semester-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.semester-item.excellent {
  background: linear-gradient(135deg, rgba(72, 187, 120, 0.1) 0%, rgba(104, 211, 145, 0.05) 100%);
  border-left: 4px solid #48bb78;
}

.semester-item.good {
  background: linear-gradient(135deg, rgba(66, 153, 225, 0.1) 0%, rgba(99, 179, 237, 0.05) 100%);
  border-left: 4px solid #4299e1;
}

.semester-item.average {
  background: linear-gradient(135deg, rgba(237, 137, 54, 0.1) 0%, rgba(246, 173, 85, 0.05) 100%);
  border-left: 4px solid #ed8936;
}

.semester-item.needs-improvement {
  background: linear-gradient(135deg, rgba(245, 101, 101, 0.1) 0%, rgba(252, 129, 129, 0.05) 100%);
  border-left: 4px solid #f56565;
}

.semester-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: white;
  flex-shrink: 0;
}

.semester-item.excellent .semester-number {
  background: var(--gradient-success);
}

.semester-item.good .semester-number {
  background: var(--gradient-info);
}

.semester-item.average .semester-number {
  background: var(--gradient-warning);
}

.semester-item.needs-improvement .semester-number {
  background: linear-gradient(135deg, #f56565 0%, #e53e3e 100%);
}

.semester-gpa {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-color);
  flex: 1;
}

.semester-status {
  padding: 6px 16px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.semester-item.excellent .semester-status {
  background: rgba(72, 187, 120, 0.2);
  color: #2f855a;
}

.semester-item.good .semester-status {
  background: rgba(66, 153, 225, 0.2);
  color: #2c5282;
}

.semester-item.average .semester-status {
  background: rgba(237, 137, 54, 0.2);
  color: #c05621;
}

.semester-item.needs-improvement .semester-status {
  background: rgba(245, 101, 101, 0.2);
  color: #c53030;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 32px 20px;
  color: var(--text-light);
  font-size: 1.1rem;
  background: rgba(102, 126, 234, 0.05);
  border-radius: 16px;
  border: 2px dashed var(--border-color);
}

/* Tooltip styles */
.category-item {
  position: relative;
  cursor: help;
}

.category-item::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--card-bg);
  color: var(--text-color);
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.875rem;
  white-space: pre-wrap;
  max-width: 300px;
  width: max-content;
  text-align: left;
  line-height: 1.4;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
  z-index: 1000;
  margin-bottom: 8px;
  font-weight: 500;
}

.category-item::after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--card-bg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
  z-index: 1001;
  margin-bottom: 2px;
}

.category-item:hover::before,
.category-item:hover::after {
  opacity: 1;
  visibility: visible;
}

/* Chart legend positioning */
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
  padding: 16px;
  background: rgba(102, 126, 234, 0.05);
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-color);
}

.legend-color {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid rgba(0,0,0,0.1);
}

/* Ensure proper text visibility in light mode */
.subject-name,
.semester-gpa,
.trend-item span:first-child,
.category-item span:first-child,
.forecast-item span:first-child,
.stat-card h4,
.chart-container h3 {
  color: var(--text-color) !important;
  font-weight: 600;
}

.subject-meta {
  color: var(--text-light);
}

.analytics-card h4,
.analytics-card small {
  color: #ffffff;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
}

.trend-item span,
.category-item span,
.forecast-item span {
  color: var(--text-color);
}

/* Dark mode specific overrides for better contrast */
[data-theme="dark"] .subject-name,
[data-theme="dark"] .semester-gpa,
[data-theme="dark"] .trend-item span:first-child,
[data-theme="dark"] .category-item span:first-child,
[data-theme="dark"] .forecast-item span:first-child,
[data-theme="dark"] .stat-card h4,
[data-theme="dark"] .chart-container h3 {
  color: var(--text-color) !important;
  text-shadow: none;
}

[data-theme="dark"] .subject-meta {
  color: var(--text-light) !important;
}

[data-theme="dark"] .analytics-card h4,
[data-theme="dark"] .analytics-card small {
  color: #ffffff !important;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
}

[data-theme="dark"] .trend-item span,
[data-theme="dark"] .category-item span,
[data-theme="dark"] .forecast-item span {
  color: var(--text-color) !important;
}

[data-theme="dark"] .empty-state {
  color: #cbd5e1;
  background: rgba(196, 181, 253, 0.1);
  border-color: rgba(100, 116, 139, 0.3);
}

[data-theme="dark"] .category-item::before {
  background: rgba(30, 41, 59, 0.98);
  color: #f8fafc;
  border-color: rgba(100, 116, 139, 0.5);
}

[data-theme="dark"] .category-item::after {
  border-top-color: rgba(30, 41, 59, 0.98);
}

[data-theme="dark"] .chart-legend {
  background: rgba(196, 181, 253, 0.1);
  border-color: rgba(100, 116, 139, 0.3);
}

[data-theme="dark"] .legend-item {
  color: #f8fafc;
}

[data-theme="dark"] .weak-subject {
  background: linear-gradient(135deg, rgba(252, 165, 165, 0.15) 0%, rgba(248, 113, 113, 0.08) 100%);
  border-left-color: #fca5a5;
}

[data-theme="dark"] .top-subject {
  background: linear-gradient(135deg, rgba(134, 239, 172, 0.15) 0%, rgba(74, 222, 128, 0.08) 100%);
  border-left-color: #86efac;
}

[data-theme="dark"] .semester-item.excellent {
  background: linear-gradient(135deg, rgba(134, 239, 172, 0.15) 0%, rgba(74, 222, 128, 0.08) 100%);
  border-left-color: #86efac;
}

[data-theme="dark"] .semester-item.good {
  background: linear-gradient(135deg, rgba(125, 211, 252, 0.15) 0%, rgba(56, 189, 248, 0.08) 100%);
  border-left-color: #7dd3fc;
}

[data-theme="dark"] .semester-item.average {
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.15) 0%, rgba(245, 158, 11, 0.08) 100%);
  border-left-color: #fbbf24;
}

[data-theme="dark"] .semester-item.needs-improvement {
  background: linear-gradient(135deg, rgba(252, 165, 165, 0.15) 0%, rgba(248, 113, 113, 0.08) 100%);
  border-left-color: #fca5a5;
}

/* Dark mode dropdown arrows */
[data-theme="dark"] .semester-selector select,
[data-theme="dark"] .form-group select,
[data-theme="dark"] .grade-select {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23f8fafc' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
}

/* Improved button styling */
.btn-secondary {
  padding: 14px 28px;
  border: none;
  background: var(--gradient-warning);
  color: white;
  border-radius: 16px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition-bounce);
  box-shadow: var(--shadow-sm);
  letter-spacing: 0.02em;
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-secondary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover::before {
  left: 100%;
}

.btn-secondary:active {
  transform: translateY(0) scale(0.98);
}

/* Animations */
@keyframes fadeIn {
  from {
      opacity: 0;
      transform: translateY(20px);
  }
  to {
      opacity: 1;
      transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
      opacity: 0;
      transform: translateY(30px);
  }
  to {
      opacity: 1;
      transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
      opacity: 0;
      transform: translateX(-20px);
  }
  to {
      opacity: 1;
      transform: translateX(0);
  }
}

.gpa-card, .subject-card, .analytics-card, .stat-card, .chart-container {
  animation: fadeInUp 0.6s ease-out;
}

.nav-btn {
  animation: slideIn 0.4s ease-out;
}

.nav-btn:nth-child(1) { animation-delay: 0.1s; }
.nav-btn:nth-child(2) { animation-delay: 0.2s; }
.nav-btn:nth-child(3) { animation-delay: 0.3s; }

/* Mobile Responsive */
@media (max-width: 1024px) {
  .charts-section {
      grid-template-columns: 1fr;
  }

  .subjects-grid {
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

@media (max-width: 768px) {
  .container {
      padding: 16px;
  }

  .header-top {
      flex-direction: column;
      text-align: center;
      gap: 16px;
      padding: 20px 24px;
  }

  header h1 {
      font-size: 2rem;
  }

  .header-controls {
      justify-content: center;
      gap: 12px;
  }

  .theme-toggle {
      width: 44px;
      height: 44px;
  }

  nav {
      padding: 6px;
      gap: 2px;
  }

  .nav-btn {
      padding: 12px 20px;
      font-size: 0.9rem;
      min-width: 120px;
  }

  .gpa-summary {
      grid-template-columns: 1fr;
      gap: 20px;
  }

  .gpa-card {
      padding: 24px 20px;
  }

  .gpa-value {
      font-size: 2.5rem;
  }

  .subjects-grid {
      grid-template-columns: 1fr;
      gap: 20px;
  }

  .subject-card {
      padding: 20px;
  }

  .detailed-analytics {
      grid-template-columns: 1fr;
  }

  .analytics-summary {
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
  }

  .analytics-card {
      padding: 20px 16px;
  }

  .analytics-value {
      font-size: 2rem;
  }

  .chart-container {
      padding: 20px;
  }

  .stat-card {
      padding: 20px;
  }

  #gpaChart, #gradeChart {
      max-width: 100%;
      height: auto;
  }
}

/* Not Offered Subject Styling */
.subject-card.not-offered {
  opacity: 0.7;
  background: linear-gradient(145deg, rgba(107, 114, 128, 0.1) 0%, rgba(156, 163, 175, 0.05) 100%);
  border: 2px dashed var(--border-color);
}

.not-offered-badge {
  display: inline-block;
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: white;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 700;
  margin-left: 8px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
  box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
}

.subject-card.not-offered h4 {
  color: var(--text-light);
  text-decoration: line-through;
}

.subject-card.not-offered .subject-info {
  color: var(--text-light);
  opacity: 0.8;
}

.subject-card.not-offered .grade-select {
  background: rgba(107, 114, 128, 0.1);
  border-color: rgba(107, 114, 128, 0.3);
}

.subject-card.not-offered .grade-points {
  color: var(--danger-color);
  font-weight: 600;
}

/* Dark mode not offered styling */
[data-theme="dark"] .subject-card.not-offered {
  background: linear-gradient(145deg, rgba(75, 85, 99, 0.2) 0%, rgba(107, 114, 128, 0.1) 100%);
  border-color: rgba(107, 114, 128, 0.4);
}

[data-theme="dark"] .subject-card.not-offered h4 {
  color: #9ca3af;
}

[data-theme="dark"] .subject-card.not-offered .subject-info {
  color: #9ca3af;
}

[data-theme="dark"] .subject-card.not-offered .grade-select {
  background: rgba(75, 85, 99, 0.3);
  border-color: rgba(107, 114, 128, 0.4);
  color: #d1d5db;
}

/* Multi-Subject Simulator Styling */
.simulation-controls {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  align-items: center;
}

.simulation-controls .btn-primary {
  background: var(--gradient-primary);
  color: white;
  border: none;
  padding: 14px 28px;
  border-radius: 16px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-sm);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  min-width: 160px;
}

.simulation-controls .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.simulation-controls .btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.simulation-controls .btn-secondary {
  background: transparent;
  color: var(--text-color);
  border: 2px solid var(--border-color);
  padding: 12px 24px;
  border-radius: 16px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  min-width: 120px;
}

.simulation-controls .btn-secondary:hover {
  background: rgba(102, 126, 234, 0.1);
  border-color: var(--primary-color);
  transform: translateY(-1px);
}

/* Dark mode button styling */
[data-theme="dark"] .simulation-controls .btn-primary {
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
}

[data-theme="dark"] .simulation-controls .btn-secondary {
  color: #ffffff;
  border-color: rgba(148, 163, 184, 0.4);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
}

[data-theme="dark"] .simulation-controls .btn-secondary:hover {
  border-color: var(--primary-color);
}

.simulation-slot {
  background: var(--gradient-card);
  border: 2px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
  position: relative;
  transition: var(--transition-smooth);
}

.simulation-slot:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.simulation-slot.active {
  border-color: var(--success-color);
  box-shadow: 0 0 0 3px rgba(134, 239, 172, 0.2);
}

.simulation-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.simulation-title {
  font-weight: 700;
  color: var(--text-color);
  font-size: 1.1rem;
}

.remove-simulation {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: white;
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  transition: var(--transition-smooth);
  box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
}

.remove-simulation:hover {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  transform: scale(1.1);
  box-shadow: 0 4px 8px rgba(239, 68, 68, 0.4);
}

.simulation-form {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.simulation-impact {
  background: linear-gradient(135deg, rgba(134, 239, 172, 0.1) 0%, rgba(34, 197, 94, 0.05) 100%);
  border: 2px solid rgba(134, 239, 172, 0.3);
  border-radius: 12px;
  padding: 14px 16px;
  text-align: center;
  font-weight: 700;
  font-size: 1rem;
  color: var(--success-color);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
  transition: var(--transition-smooth);
}

.simulation-impact:hover {
  border-color: rgba(134, 239, 172, 0.5);
  transform: translateY(-1px);
}

.simulation-summary {
  background: var(--gradient-card);
  border: 2px solid var(--primary-color);
  border-radius: 20px;
  padding: 28px;
  margin-top: 24px;
  box-shadow: var(--shadow-md);
  transition: var(--transition-smooth);
}

.simulation-summary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.simulation-summary h3 {
  color: var(--text-color);
  margin-bottom: 20px;
  font-size: 1.4rem;
  font-weight: 700;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.impact-breakdown {
  display: grid;
  gap: 16px;
}

.impact-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: rgba(102, 126, 234, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  transition: var(--transition-smooth);
}

.impact-item:hover {
  background: rgba(102, 126, 234, 0.1);
  border-color: var(--primary-color);
}

.impact-item:last-child {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.05) 100%);
  border: 2px solid var(--primary-color);
  font-weight: 700;
  font-size: 1.1rem;
}

.impact-item span:first-child {
  color: var(--text-color);
  font-weight: 600;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.impact-item span:last-child {
  color: var(--primary-color);
  font-weight: 700;
  font-size: 1.1rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Dark mode simulator styling */
[data-theme="dark"] .simulation-slot {
  background: rgba(30, 41, 59, 0.95);
  border-color: rgba(148, 163, 184, 0.3);
}

[data-theme="dark"] .simulation-summary {
  background: rgba(30, 41, 59, 0.95);
  border-color: var(--primary-color);
}

[data-theme="dark"] .simulation-impact {
  background: rgba(134, 239, 172, 0.15);
  border-color: rgba(134, 239, 172, 0.4);
}

@media (max-width: 480px) {
  .container {
      padding: 12px;
  }

  .header-top {
      padding: 16px 20px;
  }

  header h1 {
      font-size: 1.75rem;
  }

  .nav-btn {
      padding: 10px 16px;
      font-size: 0.85rem;
      min-width: 100px;
  }

  .gpa-card {
      padding: 20px 16px;
  }

  .gpa-value {
      font-size: 2.2rem;
  }

  .analytics-summary {
      grid-template-columns: 1fr;
  }

  .analytics-card {
      padding: 24px 20px;
  }

  .analytics-value {
      font-size: 2.2rem;
  }

  .subject-card {
      padding: 16px;
  }

  .chart-container {
      padding: 16px;
  }

  .stat-card {
      padding: 16px;
  }

  /* Simulator mobile responsive */
  .simulation-form {
      grid-template-columns: 1fr;
      gap: 12px;
  }

  .simulation-controls {
      flex-direction: column;
      align-items: stretch;
  }

  .simulation-controls .btn-primary,
  .simulation-controls .btn-secondary {
      min-width: auto;
      width: 100%;
  }
}