* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background: linear-gradient(135deg, #1e3c72 0%, #2a5298 50%, #7e22ce 100%);
  min-height: 100vh;
  padding: 20px;
  transition: all 0.3s ease;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3), transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(99, 102, 241, 0.3), transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(168, 85, 247, 0.2), transparent 50%);
  pointer-events: none;
  z-index: 0;
}

body > .container {
  position: relative;
  z-index: 1;
}

.container {
  display: flex;
  max-width: 1400px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.98);
  border-radius: 20px;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(255, 255, 255, 0.1);
  overflow: hidden;
  min-height: 90vh;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

/* Left Pane Styles */
.left-pane {
  width: 300px;
  background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
  color: white;
  padding: 30px 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  position: relative;
  box-shadow: 4px 0 15px rgba(0, 0, 0, 0.1);
}

.left-pane.collapsed {
  width: 0;
  padding: 0;
  overflow: hidden;
}

.hamburger-btn {
  position: absolute;
  top: 15px;
  right: -45px;
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  border: none;
  color: white;
  padding: 10px 15px;
  border-radius: 0 8px 8px 0;
  cursor: pointer;
  font-size: 18px;
  z-index: 100;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.hamburger-btn:hover {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  transform: translateX(2px);
}

.grammar-heading {
  text-align: center;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px solid rgba(99, 102, 241, 0.3);
}

.grammar-heading h1 {
  font-size: 26px;
  margin-bottom: 8px;
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-shadow: 0 2px 10px rgba(99, 102, 241, 0.3);
}

.grammar-heading p {
  color: #bdc3c7;
  font-size: 14px;
}

.nav-section {
  margin-bottom: 25px;
}

.nav-section h3 {
  color: #a78bfa;
  margin-bottom: 15px;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 600;
}

.customize-form {
  background: rgba(30, 41, 59, 0.6);
  padding: 18px;
  border-radius: 12px;
  margin-bottom: 20px;
  border: 1px solid rgba(139, 92, 246, 0.2);
  backdrop-filter: blur(10px);
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  color: #bdc3c7;
  font-size: 14px;
}

.form-select,
.form-input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid rgba(139, 92, 246, 0.3);
  background: rgba(15, 23, 42, 0.6);
  color: white;
  transition: all 0.3s ease;
}

.form-select:focus,
.form-input:focus {
  outline: none;
  border-color: #8b5cf6;
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 5px;
}

.radio-option {
  display: flex;
  align-items: center;
}

.radio-option input {
  margin-right: 8px;
}

.radio-option label {
  margin-bottom: 0;
  font-size: 14px;
}

.btn {
  padding: 12px 25px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
  width: 100%;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.topic-line {
  margin: 12px 0;
  padding: 0 10px;
}

.topic-links {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topic-name {
  color: #ecf0f1;
  font-size: 14px;
  flex: 1;
}

.topic-actions {
  display: flex;
  gap: 10px;
}

.topic-link {
  color: #bdc3c7;
  text-decoration: none;
  font-size: 13px;
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}

.topic-link:hover {
  color: white;
  border-bottom: 2px solid #8b5cf6;
  transform: translateX(2px);
}

/* Settings Section */
.settings-section {
  margin-top: auto;
  padding-top: 20px;
  border-top: 2px solid rgba(99, 102, 241, 0.3);
}

.settings-section h3 {
  color: #a78bfa;
  margin-bottom: 15px;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 600;
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.setting-item {
  display: flex;
  align-items: center;
}

.setting-checkbox {
  margin-right: 8px;
  transform: scale(1.1);
}

.setting-label {
  color: #ecf0f1;
  font-size: 13px;
}

/* Right Pane Styles */
.right-pane {
  flex: 1;
  padding: 30px;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  overflow-y: auto;
  position: relative;
  transition: all 0.3s ease;
}

.right-pane.expanded {
  margin-left: 0;
}

.pane-header {
  margin-bottom: 25px;
  padding-bottom: 15px;
  border-bottom: 2px solid #e9ecef;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-content h2 {
  color: #1e293b;
  font-size: 32px;
  margin-bottom: 5px;
  font-weight: 700;
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-content p {
  color: #7f8c8d;
  font-size: 16px;
}

.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.btn-link {
      border: 0;
    background: none;
    color: blue;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
}
.btn-link:hover {
    text-decoration: underline;

}

.history-btn {
  background: linear-gradient(135deg, #f59e0b 0%, #ea580c 100%);
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
  width: 100%;
}

.history-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
}

/* Test Styles - Compact Mode */
.test-container {
  background: white;
  border-radius: 16px;
  padding: 25px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  min-height: 400px;
  border: 1px solid rgba(99, 102, 241, 0.1);
}

.all-questions-container {
  display: grid;
  gap: 15px;
}

.question-card {
  padding: 20px;
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  break-inside: avoid;
  transition: all 0.3s ease;
}

.question-card:hover {
  border-color: #c4b5fd;
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.1);
  transform: translateY(-2px);
}

.question-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  align-items: center;
}

.question-number {
  font-weight: 700;
  color: #8b5cf6;
  font-size: 15px;
  padding: 4px 12px;
  background: rgba(139, 92, 246, 0.1);
  border-radius: 6px;
}

.question-meta {
  display: flex;
  gap: 10px;
  font-size: 12px;
  color: #7f8c8d;
  text-transform: capitalize;
}

.question-text {
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 15px;
  color: #1e293b;
  font-weight: 500;
}

.options-container {
  margin: 10px 0;
}

.option {
  margin: 8px 0;
  padding: 12px 15px;
  border: 2px solid #e2e8f0;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 15px;
  background: white;
}

.option:hover {
  border-color: #a78bfa;
  background: linear-gradient(135deg, #faf5ff 0%, #f3e8ff 100%);
  transform: translateX(4px);
}

.option.selected {
  border-color: #6366f1;
  background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.2);
}

.option.correct {
  border-color: #10b981;
  background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.2);
}

.option.incorrect {
  border-color: #ef4444;
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.2);
}

.test-controls {
  text-align: center;
  margin-top: 25px;
  padding-top: 15px;
  border-top: 1px solid #e9ecef;
}

.btn-success {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.6);
}

.btn-print {
  background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

.btn-print:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.6);
}

/* View All Styles - Compact */
.questions-list {
  display: grid;
  gap: 15px;
}

.question-item {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
  border-left: 4px solid #8b5cf6;
  transition: all 0.3s ease;
}

.question-item:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
  transform: translateX(4px);
}

.item-meta {
  display: flex;
  gap: 10px;
  margin-bottom: 8px;
  font-size: 12px;
  color: #7f8c8d;
}

.explanation {
  margin-top: 12px;
  padding: 12px 15px;
  background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
  border-radius: 8px;
  border-left: 4px solid #10b981;
  font-size: 14px;
  line-height: 1.6;
}

.correct-answer {
  color: #059669;
  font-weight: 700;
}

.loading {
  text-align: center;
  padding: 40px;
  color: #7f8c8d;
  font-size: 18px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  z-index: 10;
  display: none;
}

/* Modal Styles */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-content {
  background: white;
  border-radius: 10px;
  padding: 25px;
  max-width: 800px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 1px solid #e9ecef;
}

.modal-header h2 {
  color: #2c3e50;
  margin: 0;
}

.close-btn {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: #7f8c8d;
  transition: color 0.3s ease;
}

.close-btn:hover {
  color: #e74c3c;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

.history-table th,
.history-table td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid #e9ecef;
}

.history-table th {
  background: #f8f9fa;
  font-weight: 600;
  color: #2c3e50;
}

.history-table tr:hover {
  background: #f8f9fa;
}

.review-btn {
  background: #3498db;
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  transition: background 0.3s ease;
}

.review-btn:hover {
  background: #2980b9;
}

/* Print Styles */
@media print {
  body * {
    visibility: hidden;
  }
  .right-pane,
  .right-pane * {
    visibility: visible;
  }
  .right-pane {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    background: white;
    padding: 20px;
  }
  .btn,
  .header-actions,
  .test-controls,
  .hamburger-btn,
  .history-btn {
    display: none !important;
  }
  .question-card,
  .question-item {
    break-inside: avoid;
    margin-bottom: 15px;
    border: 1px solid #ddd;
  }
  .option {
    border: 1px solid #ddd;
  }
  .loading,
  .modal {
    display: none !important;
  }
}

/* Mobile Responsive */
@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  .container {
    flex-direction: column;
    min-height: auto;
  }

  .left-pane {
    width: 100%;
    max-height: 50vh;
  }

  .left-pane.collapsed {
    width: 100%;
    max-height: 60px;
    overflow: hidden;
  }

  .hamburger-btn {
    position: static;
    width: 100%;
    border-radius: 5px;
    margin-bottom: 10px;
  }

  .right-pane {
    padding: 20px;
  }

  .pane-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .settings-grid {
    grid-template-columns: 1fr;
  }

  .modal-content {
    width: 95%;
    padding: 15px;
  }

  .history-table {
    font-size: 14px;
  }

  .history-table th,
  .history-table td {
    padding: 8px 10px;
  }
}

/* Ultra Compact Mode */
body.compact-mode .question-card {
  padding: 10px;
  margin-bottom: 8px;
}

body.compact-mode .question-text {
  font-size: 16px;
  line-height: 1.4;
  margin-bottom: 8px;
  font-weight: 500;
}

body.compact-mode .option {
  padding: 6px 8px;
  margin: 4px 0;
  font-size: 13px;
}

body.compact-mode .question-meta {
  font-size: 11px;
}

body.compact-mode .explanation {
  padding: 8px;
  font-size: 13px;
}

body.compact-mode .test-container {
  padding: 15px;
}

body.compact-mode .all-questions-container {
  gap: 10px;
}

/* Confetti Animation */
.confetti {
  position: fixed;
  width: 10px;
  height: 10px;
  background: #f0f;
  position: fixed;
  animation: confetti-fall 3s linear forwards;
  z-index: 99999;
  pointer-events: none;
}

@keyframes confetti-fall {
  to {
    transform: translateY(100vh) rotate(360deg);
    opacity: 0;
  }
}

.perfect-score-banner {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #dc2626 100%);
  color: white;
  padding: 40px 60px;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  z-index: 10000;
  text-align: center;
  animation: banner-pop 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
  animation-delay: 0.5s;
}

.perfect-score-banner h2 {
  font-size: 48px;
  margin-bottom: 15px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  animation: glow 1.5s ease-in-out infinite;
}

.perfect-score-banner p {
  font-size: 24px;
  margin: 0;
}

@keyframes banner-pop {
  0% {
    transform: translate(-50%, -50%) scale(0) rotate(-180deg);
    opacity: 0;
  }
  100% {
    transform: translate(-50%, -50%) scale(1) rotate(0deg);
    opacity: 1;
  }
}

@keyframes glow {
  0%, 100% {
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.5), 0 0 30px rgba(255, 255, 255, 0.3);
  }
  50% {
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.8), 0 0 50px rgba(255, 255, 255, 0.5);
  }
}

/* --- Add to styles.css --- */

/* Question Paper Breakdown Styling */
.topic-breakdown-container {
  background: #f1f5f9;
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 20px;
  border: 1px solid #cbd5e1;
}

.topic-breakdown-label {
  font-size: 13px;
  font-weight: 700;
  color: #64748b;
  margin-bottom: 8px;
  display: block;
  text-transform: uppercase;
}

.topic-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.topic-badge {
  background: white;
  border: 1px solid #94a3b8;
  color: #334155;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

/* Result Breakdown Table Styling */
.result-summary-container {
  margin: 20px 0;
  padding: 0 10px;
}

.result-breakdown-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  overflow: hidden;
}

.result-breakdown-table th, 
.result-breakdown-table td {
  padding: 10px 15px;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
}

.result-breakdown-table th {
  background-color: #f8fafc;
  color: #64748b;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 12px;
}

.result-breakdown-table tr:last-child td {
  border-bottom: none;
}

.score-good { color: #10b981; font-weight: bold; }
.score-avg { color: #f59e0b; font-weight: bold; }
.score-bad { color: #ef4444; font-weight: bold; }