/* Premium Professional Design System */
:root {
  --primary-blue: #1e3a8a;
  --primary-blue-dark: #1e40af;
  --primary-blue-light: #3b82f6;
  --secondary-blue: #2563eb;
  --accent-blue: #60a5fa;
  --accent-blue-light: #93c5fd;
  --dark-gray: #0f172a;
  --medium-gray: #475569;
  --light-gray: #94a3b8;
  --lighter-gray: #e2e8f0;
  --background: #f1f5f9;
  --background-light: #ffffff;
  --white: #ffffff;
  --success: #059669;
  --success-light: #10b981;
  --error: #dc2626;
  --error-light: #fee2e2;
  --error-dark: #991b1b;
  --warning: #d97706;
  --warning-light: #f59e0b;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  --border-color: #cbd5e1;
  --border-color-focus: #2563eb;
  --shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.1), 0 1px 2px -1px rgba(15, 23, 42, 0.1);
  --shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.1), 0 2px 4px -2px rgba(15, 23, 42, 0.1);
  --shadow-md: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -4px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.1);
  --shadow-xl: 0 25px 50px -12px rgba(15, 23, 42, 0.25);
  --shadow-2xl: 0 30px 60px -12px rgba(15, 23, 42, 0.35);
  --radius-sm: 6px;
  --radius: 10px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-primary: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #3b82f6 100%);
  --gradient-primary-hover: linear-gradient(135deg, #1e40af 0%, #1e3a8a 50%, #2563eb 100%);
  --gradient-surface: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #cbd5e1 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.65;
  font-size: 16px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 32px;
  min-height: calc(100vh - 64px);
}

/* Premium Header Styles */
.header {
  background: var(--gradient-primary);
  color: var(--white);
  padding: 48px 56px;
  border-radius: var(--radius-2xl);
  margin-bottom: 48px;
  box-shadow: var(--shadow-2xl);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: rotate 20s linear infinite;
  pointer-events: none;
}

.header::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, transparent 100%);
  pointer-events: none;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.header > div {
  position: relative;
  z-index: 1;
}

.header h1 {
  font-size: 3.25em;
  margin-bottom: 12px;
  font-weight: 800;
  letter-spacing: -1px;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  line-height: 1.1;
}

.subtitle {
  font-size: 1.25em;
  margin-bottom: 16px;
  opacity: 0.96;
  font-weight: 400;
  letter-spacing: -0.2px;
}

.attribution {
  font-size: 0.9em;
  opacity: 0.88;
  font-style: italic;
  margin-top: 12px;
  font-weight: 300;
  letter-spacing: 0.2px;
}

/* Header Auth Section */
#authSection {
  text-align: right;
}

#userInfo {
  color: var(--white);
}

#userInfo p {
  margin: 8px 0;
  font-size: 0.975em;
  letter-spacing: 0.1px;
}

#userInfo strong {
  font-weight: 700;
  opacity: 0.95;
}

#userInfo > div {
  display: flex;
  gap: 12px;
  margin-top: 12px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

#buyTokensBtn {
  background: linear-gradient(135deg, #059669 0%, #10b981 100%);
  backdrop-filter: blur(10px);
  font-weight: 600;
  white-space: nowrap;
}

#buyTokensBtn:hover {
  background: linear-gradient(135deg, #047857 0%, #059669 100%);
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
}

#logoutBtn {
  margin: 0;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: var(--white);
}

#logoutBtn:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
}

#loginPrompt {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

#loginPrompt .btn {
  margin: 0;
  backdrop-filter: blur(10px);
}

/* Main Content */
.main-content {
  padding: 0;
}

/* Content Panels - Full Width Layout */
.content-panels {
  display: block;
  margin-bottom: 36px;
}

.panel-full {
  max-width: 100%;
  width: 100%;
}

/* Premium Panel Styles */
.panel-left,
.panel-right {
  background: var(--gradient-surface);
  padding: 32px;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  transition: var(--transition-slow);
  border: 1px solid rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

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

.panel-left:hover,
.panel-right:hover {
  box-shadow: var(--shadow-2xl);
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.3);
}

.panel-left:hover::before,
.panel-right:hover::before {
  opacity: 1;
}

.panel-title {
  color: var(--primary-blue);
  font-size: 1.75em;
  margin-bottom: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  position: relative;
  padding-bottom: 8px;
}

.panel-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

/* Premium Info Panel */
.info-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 60px 32px;
  height: 100%;
  justify-content: center;
}

.info-icon {
  width: 120px;
  height: 120px;
  margin-bottom: 32px;
  color: var(--primary-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.95;
  animation: float 4s ease-in-out infinite;
  filter: drop-shadow(0 8px 16px rgba(30, 58, 138, 0.2));
}

.info-icon svg {
  width: 100%;
  height: 100%;
}

.info-title {
  color: var(--primary-blue);
  font-size: 2.25em;
  margin-bottom: 20px;
  font-weight: 800;
  letter-spacing: -0.75px;
}

.info-description {
  color: var(--text-secondary);
  font-size: 1.1em;
  line-height: 1.75;
  max-width: 420px;
  letter-spacing: -0.1px;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-12px) rotate(2deg);
  }
}

/* Premium Form Styles */
.case-study-form {
  max-width: 100%;
}

/* Full-width form layout for better space utilization */
.panel-full .case-study-form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 20px;
}

/* Full-width form groups (textareas, checkbox groups) */
.panel-full .case-study-form .form-group:has(textarea),
.panel-full .case-study-form .form-group:has(.checkbox-group),
.panel-full .case-study-form .form-group[data-full-width] {
  grid-column: 1 / -1;
}

.panel-full .form-actions {
  grid-column: 1 / -1;
  margin-top: 20px;
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .panel-full .case-study-form {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

.field-description {
  font-size: 0.85em;
  color: var(--text-secondary);
  margin-top: 4px;
  margin-bottom: 0;
  font-style: italic;
  line-height: 1.4;
  letter-spacing: 0.1px;
}

.form-group {
  margin-bottom: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95em;
  margin-top: 0;
  letter-spacing: -0.15px;
}

.required {
  color: var(--error);
  font-weight: 700;
  margin-left: 3px;
}

/* Premium Input Styles */
input[type='text'],
input[type='email'],
input[type='password'],
input[type='tel'],
input[type='number'],
textarea,
select {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.95em;
  font-family: inherit;
  transition: var(--transition);
  background-color: var(--white);
  margin-top: 0;
  color: var(--text-primary);
  box-shadow: var(--shadow-xs);
}

input[type='text']:hover,
input[type='email']:hover,
input[type='password']:hover,
input[type='tel']:hover,
input[type='number']:hover,
textarea:hover,
select:hover {
  border-color: var(--light-gray);
  box-shadow: var(--shadow-sm);
}

input[type='text']:focus,
input[type='email']:focus,
input[type='password']:focus,
input[type='tel']:focus,
input[type='number']:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--border-color-focus);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12), var(--shadow-md);
  background-color: var(--white);
  transform: translateY(-1px);
}

textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.6;
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23475569' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 18px center;
  padding-right: 45px;
}

/* Premium Range Sliders */
input[type='range'] {
  width: 100%;
  height: 10px;
  border-radius: 8px;
  background: var(--lighter-gray);
  outline: none;
  -webkit-appearance: none;
  margin-top: 12px;
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gradient-primary);
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(30, 58, 138, 0.3);
  transition: var(--transition);
}

input[type='range']::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 6px 12px rgba(30, 58, 138, 0.4);
}

input[type='range']::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--secondary-blue);
  cursor: pointer;
  border: none;
  box-shadow: 0 4px 8px rgba(30, 58, 138, 0.3);
  transition: var(--transition);
}

input[type='range']::-moz-range-thumb:hover {
  transform: scale(1.15);
}

.range-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 0.875em;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Premium Checkbox Group */
.checkbox-group {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  margin-top: 6px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  cursor: pointer;
  padding: 10px 12px;
  border: 2px solid var(--lighter-gray);
  border-radius: var(--radius-md);
  transition: var(--transition);
  background: var(--white);
  position: relative;
  overflow: hidden;
}

.checkbox-label::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
  transition: var(--transition-slow);
}

.checkbox-label:hover {
  background-color: rgba(37, 99, 235, 0.04);
  border-color: var(--accent-blue);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.checkbox-label:hover::before {
  left: 100%;
}

.checkbox-label input[type='checkbox'] {
  width: 20px;
  height: 20px;
  margin-right: 12px;
  cursor: pointer;
  accent-color: var(--primary-blue);
}

.checkbox-label input[type='checkbox']:checked + span {
  font-weight: 600;
  color: var(--primary-blue);
}

/* Premium Buttons */
.btn {
  padding: 14px 28px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  text-decoration: none;
  display: inline-block;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.2px;
  box-shadow: var(--shadow);
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

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

.btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-md);
  position: relative;
}

.btn-primary:hover:not(:disabled) {
  background: var(--gradient-primary-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:disabled {
  background: var(--light-gray);
  cursor: not-allowed;
  transform: none;
  opacity: 0.6;
  box-shadow: none;
}

.btn-secondary {
  background-color: var(--white);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--background);
  border-color: var(--primary-blue-light);
  color: var(--primary-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-warning {
  background: linear-gradient(135deg, var(--warning) 0%, var(--warning-light) 100%);
  color: var(--white);
}

.btn-export {
  background: linear-gradient(135deg, var(--success) 0%, var(--success-light) 100%);
  color: var(--white);
  margin-left: 12px;
}

.btn-export:hover {
  background: linear-gradient(135deg, var(--success-light) 0%, var(--success) 100%);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.form-actions {
  display: flex;
  gap: 16px;
  margin-top: 32px;
  justify-content: flex-start;
}

.form-actions .btn {
  flex: 1;
}

/* Premium Loading Indicator */
.loading-indicator {
  text-align: center;
  padding: 80px 48px;
  background: var(--gradient-surface);
  border-radius: var(--radius-2xl);
  margin-top: 36px;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.progress-bar-container {
  width: 100%;
  max-width: 480px;
  height: 12px;
  background: var(--lighter-gray);
  border-radius: 999px;
  overflow: hidden;
  margin: 0 auto 16px;
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.08);
}

.progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 999px;
  transition: width 0.35s ease-out;
  box-shadow: 0 0 12px rgba(37, 99, 235, 0.35);
}

.progress-label {
  color: var(--text-primary);
  font-size: 1em;
  font-weight: 600;
  margin-bottom: 6px;
}

.progress-percent {
  color: var(--text-secondary);
  font-size: 0.95em;
  font-weight: 500;
}

.progress-info {
  margin-top: 20px;
  color: var(--text-secondary);
  font-size: 0.95em;
  font-weight: 500;
}

/* Premium Error Container */
.error-container {
  background: linear-gradient(135deg, var(--error-light) 0%, rgba(254, 226, 226, 0.8) 100%);
  border: 2px solid var(--error);
  color: var(--error-dark);
  padding: 18px 22px;
  border-radius: var(--radius-md);
  margin-top: 24px;
  margin-bottom: 24px;
  font-weight: 500;
  font-size: 0.925em;
  display: flex;
  align-items: center;
  gap: 12px;
  animation: slideDown 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
}

.error-container::before {
  content: '⚠';
  font-size: 1.4em;
  flex-shrink: 0;
}

.error-message {
  background: linear-gradient(135deg, var(--error-light) 0%, rgba(254, 226, 226, 0.8) 100%);
  border: 2px solid var(--error);
  color: var(--error-dark);
  padding: 24px;
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Premium Toast Notification */
.toast {
  position: fixed;
  bottom: 32px;
  right: 32px;
  background-color: var(--dark-gray);
  color: var(--white);
  padding: 18px 28px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2xl);
  z-index: 1000;
  min-width: 300px;
  max-width: 420px;
  animation: slideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 14px;
  backdrop-filter: blur(10px);
}

.toast-info {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
}

.toast-info::before {
  content: 'ℹ';
  font-size: 1.3em;
  font-weight: bold;
}

.toast-success {
  background: linear-gradient(135deg, var(--success) 0%, var(--success-light) 100%);
}

.toast-success::before {
  content: '✓';
  font-size: 1.3em;
  font-weight: bold;
}

.toast-error {
  background: linear-gradient(135deg, var(--error) 0%, var(--error-dark) 100%);
}

.toast-error::before {
  content: '✕';
  font-size: 1.3em;
  font-weight: bold;
}

.toast-warning {
  background: linear-gradient(135deg, var(--warning) 0%, var(--warning-light) 100%);
}

.toast-warning::before {
  content: '⚠';
  font-size: 1.3em;
  font-weight: bold;
}

@keyframes slideIn {
  from {
    transform: translateX(120%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Premium Case Study Display */
.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 36px;
  padding: 24px 32px;
  background: var(--gradient-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.export-buttons {
  margin-left: auto;
  display: flex;
  gap: 12px;
}

.case-study-container {
  background: var(--gradient-surface);
  padding: 56px;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.8);
  margin-bottom: 36px;
  animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.case-study {
  max-width: 100%;
}

.case-study-title {
  color: var(--primary-blue);
  font-size: 2.5em;
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 5px solid;
  border-image: var(--gradient-primary) 1;
  text-align: center;
  font-weight: 800;
  letter-spacing: -0.75px;
}

.case-study-section {
  margin-bottom: 48px;
  padding: 32px;
  background: var(--white);
  border-radius: var(--radius-lg);
  border-left: 5px solid var(--secondary-blue);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.case-study-section:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.case-study-section h2 {
  color: var(--primary-blue);
  font-size: 1.75em;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--lighter-gray);
  font-weight: 700;
  letter-spacing: -0.5px;
}

.narrative-content,
.theoretical-content,
.instructor-notes {
  line-height: 1.85;
  font-size: 1.075em;
  color: var(--text-primary);
  letter-spacing: 0.05px;
}

.narrative-content p,
.theoretical-content p {
  margin-bottom: 18px;
}

.narrative-content table,
.theoretical-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: var(--white);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.narrative-content table th,
.theoretical-content table th {
  background: var(--gradient-primary);
  color: var(--white);
  padding: 16px;
  text-align: left;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.narrative-content table td,
.theoretical-content table td {
  padding: 16px;
  border-bottom: 1px solid var(--lighter-gray);
}

.narrative-content table tr:hover,
.theoretical-content table tr:hover {
  background-color: rgba(37, 99, 235, 0.04);
}

/* Lists */
.discussion-questions,
.discussion-flow,
.model-answers {
  list-style-position: inside;
  padding-left: 24px;
}

.discussion-questions li,
.discussion-flow li,
.model-answers li {
  margin-bottom: 18px;
  padding-left: 12px;
  line-height: 1.8;
}

.key-takeaways,
.common-mistakes,
.editing-suggestions {
  list-style-type: disc;
  padding-left: 36px;
}

.key-takeaways li,
.common-mistakes li,
.editing-suggestions li {
  margin-bottom: 14px;
  line-height: 1.75;
}

/* Teaching Note */
.teaching-note {
  display: grid;
  gap: 24px;
}

.teaching-note-item {
  background: var(--white);
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--lighter-gray);
  box-shadow: var(--shadow-xs);
  transition: var(--transition);
}

.teaching-note-item:hover {
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.teaching-note-item h3 {
  color: var(--primary-blue);
  font-size: 1.4em;
  margin-bottom: 12px;
  font-weight: 700;
}

/* Rubric Table */
.rubric-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 24px;
  background: var(--white);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.rubric-table th {
  background: var(--gradient-primary);
  color: var(--white);
  padding: 18px;
  text-align: left;
  font-weight: 700;
}

.rubric-table td {
  padding: 18px;
  border-bottom: 1px solid var(--lighter-gray);
}

.rubric-table tr:hover {
  background-color: rgba(37, 99, 235, 0.04);
}

/* Edit Mode */
[contenteditable='true'] {
  outline: 2px dashed var(--accent-blue);
  padding: 8px;
  border-radius: var(--radius-sm);
  min-height: 24px;
  transition: var(--transition);
}

[contenteditable='true']:focus {
  outline: 2px solid var(--secondary-blue);
  background-color: rgba(37, 99, 235, 0.06);
}

/* Batch Navigation */
.batch-navigation {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  margin-top: 36px;
  padding: 24px 32px;
  background: var(--gradient-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

#caseCounter {
  font-weight: 700;
  color: var(--primary-blue);
  font-size: 1.15em;
  letter-spacing: 0.2px;
}

/* Main Content Background for Auth Pages */
.main-content:has(.auth-container) {
  min-height: calc(100vh - 200px);
  display: flex;
  align-items: center;
}

/* Fallback for browsers without :has() support */
.auth-page .main-content {
  min-height: calc(100vh - 200px);
  display: flex;
  align-items: center;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .panel-left {
    padding: 28px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 20px;
  }

  .header {
    padding: 32px 28px;
  }

  .header h1 {
    font-size: 2.25em;
  }

  .subtitle {
    font-size: 1.1em;
  }

  #authSection {
    text-align: left;
    margin-top: 16px;
  }

  #userInfo > div {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  #userInfo > div .btn {
    width: 100%;
    justify-content: center;
  }

  .panel-left {
    padding: 20px;
  }

  .auth-container {
    margin: 24px auto;
    padding: 36px 28px;
  }

  .auth-container h2 {
    font-size: 1.85em;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .checkbox-group {
    grid-template-columns: 1fr;
  }

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

  .info-icon {
    width: 100px;
    height: 100px;
  }

  .info-title {
    font-size: 1.85em;
  }

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

  .export-buttons {
    margin-left: 0;
    flex-direction: column;
    width: 100%;
  }

  .btn-export {
    margin-left: 0;
    margin-top: 12px;
    width: 100%;
  }

  .case-study-title {
    font-size: 1.85em;
  }

  .case-study-section {
    padding: 20px;
  }

  .case-study-container {
    padding: 32px 24px;
  }

  .narrative-content table,
  .theoretical-content table,
  .rubric-table {
    font-size: 0.9em;
    display: block;
    overflow-x: auto;
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 1.75em;
  }

  .attribution {
    font-size: 0.8em;
  }

  .case-study-title {
    font-size: 1.6em;
  }

  .toast {
    right: 16px;
    left: 16px;
    min-width: auto;
  }

  .panel-left,
  .panel-right {
    padding: 24px;
  }
}

/* Premium Auth Pages Styles */
.auth-container {
  max-width: 520px;
  margin: 48px auto;
  padding: 48px 40px;
  background: var(--gradient-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(255, 255, 255, 0.8);
  position: relative;
  overflow: hidden;
}

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

.auth-container h2 {
  margin-bottom: 36px;
  text-align: center;
  font-size: 2.25em;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.75px;
}

.auth-link {
  text-align: center;
  margin-top: 28px;
  padding-top: 28px;
  border-top: 2px solid var(--lighter-gray);
}

.auth-link p {
  color: var(--text-secondary);
  font-size: 0.975em;
  margin-bottom: 8px;
}

.auth-link a {
  color: var(--primary-blue);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  position: relative;
}

.auth-link a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: var(--transition);
}

.auth-link a:hover {
  color: var(--primary-blue-dark);
}

.auth-link a:hover::after {
  width: 100%;
}

.form-group small {
  display: block;
  margin-top: 8px;
  font-size: 0.875em;
  color: var(--text-secondary);
  font-style: italic;
  letter-spacing: 0.1px;
}

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

/* Print Styles */
@media print {
  .result-actions,
  .batch-navigation {
    display: none;
  }

  .case-study-section {
    page-break-inside: avoid;
  }
}