/* ============================================================
   AWSPrepAI - 2026 Modern Design System
   Inspired by Vercel, Linear, Stripe, Notion, Figma
   ============================================================ */

:root {
  /* Ultra-Tight Spacing System */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 0.75rem;   /* 12px */
  --space-lg: 1rem;      /* 16px */
  --space-xl: 1.25rem;   /* 20px */
  --space-2xl: 1.5rem;   /* 24px */
  --space-3xl: 2rem;     /* 32px */
  --space-4xl: 3rem;     /* 48px */

  /* Primary Colors - Vibrant Blues & Purples */
  --primary-50: #EFF6FF;
  --primary-100: #DBEAFE;
  --primary-300: #93C5FD;
  --primary-500: #3B82F6;
  --primary-600: #2563EB;
  --primary-700: #1D4ED8;

  --accent-400: #A78BFA;
  --accent-500: #8B5CF6;
  --accent-600: #7C3AED;

  /* Neutrals - Modern Grays */
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;

  /* Success/Error */
  --success-500: #10B981;
  --error-500: #EF4444;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
  --gradient-hero: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
  --gradient-card: linear-gradient(135deg, rgba(103, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.08) 100%);

  /* Glass Morphism */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.12);

  /* Shadows - Modern Depth */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* CONSISTENT BORDER RADIUS - 12px EVERYWHERE */
  --radius-sm: 8px;      /* Small elements */
  --radius-md: 12px;     /* Standard */
  --radius-lg: 12px;     /* Keep consistent */
  --radius-xl: 12px;     /* Keep consistent */
  --radius-full: 100px;  /* Pills/badges */
}

/* ============================================================
   Base Typography
   ============================================================ */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter',
               'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* ============================================================
   Modern Card Components
   ============================================================ */
.card-modern {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: var(--transition-base);
}

.card-modern:hover {
  border-color: var(--primary-300);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--glass-shadow);
}

.card-gradient {
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
}

/* ============================================================
   Gradient Text
   ============================================================ */
.gradient-text {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============================================================
   Modern Buttons
   ============================================================ */
.btn-modern-primary {
  padding: 0.875rem 1.75rem;
  background: var(--gradient-hero);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-family: inherit;
}

.btn-modern-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-modern-primary:active {
  transform: translateY(0);
}

.btn-modern-secondary {
  padding: 0.875rem 1.75rem;
  background: white;
  color: var(--gray-700);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-base);
  text-decoration: none;
  font-family: inherit;
}

.btn-modern-secondary:hover {
  border-color: var(--primary-500);
  color: var(--primary-600);
}

/* ============================================================
   Section Utilities
   ============================================================ */
.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 1rem;
  background: var(--gradient-card);
  border: 1px solid var(--primary-100);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--primary-700);
  margin-bottom: 1rem;
}

/* ============================================================
   Responsive Utilities
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   ULTRA-TIGHT SPACING + CONSISTENT BORDERS - SITE WIDE
   ============================================================ */

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

/* Global Body */
body {
  margin: 0;
  padding: 0;
  line-height: 1.5;
}

/* All Sections */
section {
  padding: var(--space-2xl) var(--space-xl);
}

/* Remove gap between sections */
section + section {
  margin-top: 0;
  padding-top: var(--space-2xl);
}

/* All Containers */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl);
}

/* All Cards - CONSISTENT 12px RADIUS */
.card,
.content-card,
.feature-card,
.mode-card,
.stat-card,
.quiz-card,
.exam-card,
.builder-card,
.ve-card,
.resource-card,
.contact-card,
.glossary-card {
  padding: var(--space-xl);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

/* All Headings */
h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: var(--space-xl);
  line-height: 1.2;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 1.875rem);
  margin-bottom: var(--space-lg);
  line-height: 1.3;
}

h3 {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  margin-bottom: var(--space-md);
  line-height: 1.4;
}

/* All Paragraphs */
p {
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

/* All Lists */
ul, ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

li {
  margin-bottom: var(--space-sm);
}

/* All Grids */
.grid,
.features-grid,
.stats-grid,
.resource-grid,
.contact-grid,
.services-grid {
  display: grid;
  gap: var(--space-lg);
}

/* All Buttons - CONSISTENT 12px RADIUS */
button,
.btn,
.cta-btn,
.nav-cta,
.feature-link,
.mode-btn,
input[type="submit"] {
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
}

/* All Badges - PILL SHAPE */
.badge,
.tag,
.label,
.chip {
  border-radius: var(--radius-full);
  padding: var(--space-sm) var(--space-lg);
}

/* All Inputs - CONSISTENT 12px RADIUS */
input:not([type="checkbox"]):not([type="radio"]),
textarea,
select {
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

/* Content Images - CONSISTENT 12px RADIUS (excludes icons/logos) */
img:not([class*="logo"]):not([class*="icon"]):not([class*="avatar"]) {
  border-radius: var(--radius-md);
}

/* Quiz/Exam Cards */
.question-card,
.exam-card {
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
}

/* Visual Exam Cards */
.ve-mode-card,
.ve-stat-card {
  border-radius: var(--radius-md);
  padding: var(--space-xl);
}

/* All Tabs */
[data-tab] {
  padding: var(--space-2xl) var(--space-xl);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  section {
    padding: var(--space-xl) var(--space-lg);
  }

  .container {
    padding: var(--space-lg);
  }

  .card,
  .content-card,
  .feature-card {
    padding: var(--space-lg);
  }

  .features-grid,
  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
}


/* ==================== PAYWALL MODAL ==================== */
.paywall-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.paywall-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
}

.paywall-content {
  position: relative;
  background: white;
  border-radius: 16px;
  max-width: 560px;
  width: 90%;
  max-height: 90vh;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: slideUp 0.3s ease;
  display: flex;
  flex-direction: column;
}

.paywall-content-inner {
  overflow-y: auto;
  padding: 2rem;
  flex: 1;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.paywall-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: #6B7280;
  transition: color 0.2s;
}

.paywall-close:hover {
  color: #111827;
}

.paywall-header {
  text-align: center;
  margin-bottom: 2rem;
}

.paywall-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.paywall-header h2 {
  font-size: 1.875rem;
  font-weight: 800;
  color: #111827;
  margin-bottom: 0.75rem;
}

.paywall-subtitle {
  font-size: 1rem;
  color: #6B7280;
  line-height: 1.6;
}

.paywall-features {
  margin: 2rem 0;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.75rem;
  border-radius: 12px;
  margin-bottom: 0.5rem;
  transition: background 0.2s;
}

.feature-item:hover {
  background: #F9FAFB;
}

.feature-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.feature-text {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.feature-text strong {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #111827;
}

.feature-text span {
  font-size: 0.875rem;
  color: #6B7280;
}

.paywall-pricing {
  margin: 2rem 0;
}

.price-card {
  background: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
  color: white;
  padding: 2rem;
  border-radius: 16px;
  text-align: center;
}

.price-label {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.9;
}

.price-amount {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  margin: 1rem 0;
  line-height: 1;
}

.currency {
  font-size: 2rem;
  font-weight: 700;
  margin-top: 0.5rem;
}

.amount {
  font-size: 4rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.price-description {
  font-size: 0.9375rem;
  opacity: 0.95;
}

.btn-premium {
  width: 100%;
  background: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
  color: white;
  border: none;
  border-radius: 16px;
  padding: 1rem 2rem;
  font-size: 1.125rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 6px rgba(59, 130, 246, 0.3);
}

.btn-premium:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 12px rgba(59, 130, 246, 0.4);
}

.btn-premium:active {
  transform: translateY(0);
}

.btn-premium:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.paywall-footer {
  margin-top: 1.5rem;
  text-align: center;
}

.security-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.badge-item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: #6B7280;
}

.badge-item svg {
  opacity: 0.7;
}

/* ===== 3-Tier Pricing Cards ===== */
.paywall-pricing {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 1.5rem 0;
}

@media (max-width: 600px) {
  .paywall-pricing {
    grid-template-columns: 1fr;
  }
}

.price-tier-card {
  position: relative;
  background: #F9FAFB;
  border: 2px solid #E5E7EB;
  border-radius: 12px;
  padding: 1.25rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.price-tier-card--featured {
  border-color: #3B82F6;
  background: #EFF6FF;
}

.price-tier-card--popular {
  border-color: #8B5CF6;
  background: linear-gradient(135deg, #F5F3FF 0%, #EFF6FF 100%);
}

.price-tier-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: #3B82F6;
  background: #DBEAFE;
  border-radius: 99px;
  padding: 0.2rem 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}

.price-tier-badge--popular {
  color: #7C3AED;
  background: #EDE9FE;
}

.price-tier-label {
  font-size: 0.8125rem;
  font-weight: 700;
  color: #374151;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.price-tier-amount {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  line-height: 1;
  gap: 0.1rem;
}

.price-tier-amount .currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: #111827;
  margin-top: 0.3rem;
}

.price-tier-amount .amount {
  font-size: 2.5rem;
  font-weight: 900;
  color: #111827;
  letter-spacing: -0.02em;
}

.price-tier-period {
  font-size: 0.875rem;
  color: #6B7280;
  align-self: flex-end;
  padding-bottom: 0.25rem;
}

.price-tier-desc {
  font-size: 0.8rem;
  color: #6B7280;
  line-height: 1.4;
  min-height: 2.4em;
}

.btn-tier {
  width: 100%;
  border: none;
  border-radius: 8px;
  padding: 0.625rem 0.75rem;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: auto;
}

.btn-tier-primary {
  background: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
  color: white;
  box-shadow: 0 2px 4px rgba(59, 130, 246, 0.3);
}

.btn-tier-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(59, 130, 246, 0.4);
}

.btn-tier-secondary {
  background: white;
  color: #374151;
  border: 1.5px solid #D1D5DB;
}

.btn-tier-secondary:hover {
  border-color: #3B82F6;
  color: #3B82F6;
}

.btn-tier:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}


/* Locked Question State */
.question-locked {
  background: linear-gradient(135deg, #F9FAFB 0%, #F3F4F6 100%);
  border: 2px dashed #D1D5DB;
  border-radius: 12px;
  padding: 3rem 2rem;
  text-align: center;
  margin: 2rem 0;
}

.lock-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.question-locked h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #111827;
  margin-bottom: 0.75rem;
}

.lock-description {
  font-size: 1rem;
  color: #6B7280;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.btn-unlock {
  background: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
  color: white;
  border: none;
  border-radius: 16px;
  padding: 1rem 2rem;
  font-size: 1.125rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-unlock:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(59, 130, 246, 0.3);
}

.lock-note {
  font-size: 0.875rem;
  color: #6B7280;
  margin-top: 1rem;
}

/* Premium Badge */
#premium-badge {
  display: none;
  align-items: center;
  gap: 0.375rem;
  background: linear-gradient(135deg, #3B82F6, #8B5CF6);
  color: white;
  padding: 0.375rem 0.75rem;
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 600;
}

.premium-label {
  background: linear-gradient(135deg, #3B82F6, #8B5CF6);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
}

/* ==================== SAMPLE QUESTIONS TAB ==================== */
.sample-header {
  text-align: center;
  padding: 2rem 1rem;
  background: linear-gradient(135deg, #F0F9FF 0%, #E0E7FF 100%);
  border-radius: 12px;
  margin-bottom: 2rem;
}

.sample-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: #111827;
  margin-bottom: 1rem;
}

.sample-subtitle {
  font-size: 1.125rem;
  color: #6B7280;
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.sample-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.sample-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.sample-stat strong {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #3B82F6, #8B5CF6);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sample-stat span {
  font-size: 0.875rem;
  color: #6B7280;
  font-weight: 500;
}

/* Sample Quiz Container */
.sample-quiz-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 1.5rem;
}

.sample-progress-bar {
  height: 8px;
  background: #E5E7EB;
  border-radius: 100px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.sample-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #3B82F6, #8B5CF6);
  transition: width 0.3s ease;
  border-radius: 100px;
}

.sample-question-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

#sample-question-number {
  font-weight: 600;
  color: #374151;
}

.domain-badge {
  background: #EEF2FF;
  color: #4F46E5;
  padding: 0.375rem 0.75rem;
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 600;
}

/* Question card reuse */
.sample-quiz-container .question-card {
  background: #fff;
  border: 1px solid #E5E7EB;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.sample-quiz-container .question-text {
  font-size: 1.125rem;
  font-weight: 600;
  color: #111827;
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

.sample-quiz-container .options-list {
  display: grid;
  gap: 0.75rem;
}

.sample-quiz-container .option-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  border: 2px solid #E5E7EB;
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.sample-quiz-container .option-item:hover {
  border-color: #3B82F6;
  background: #EFF6FF;
}

.sample-quiz-container .option-item.selected {
  border-color: #3B82F6;
  background: #EFF6FF;
}

.sample-quiz-container .option-item.correct {
  border-color: #10B981;
  background: rgba(16, 185, 129, 0.1);
}

.sample-quiz-container .option-item.incorrect {
  border-color: #EF4444;
  background: rgba(239, 68, 68, 0.1);
}

.sample-quiz-container .option-item input[type="radio"] {
  display: none;
}

.sample-quiz-container .option-item label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
  width: 100%;
}

.sample-quiz-container .option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: #F3F4F6;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.sample-quiz-container .option-text {
  font-size: 0.9375rem;
  color: #374151;
  line-height: 1.5;
}

.sample-quiz-container .explanation-box {
  background: #F9FAFB;
  border: 1px solid #E5E7EB;
  border-left: 4px solid #3B82F6;
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-top: 1rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: #374151;
}

.sample-quiz-container .explanation-header {
  margin-bottom: 0.5rem;
}

.sample-quiz-container .references {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: #6B7280;
}

.sample-navigation {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.sample-navigation .btn-secondary {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid #D1D5DB;
  background: #fff;
  color: #374151;
  transition: background 0.2s, border-color 0.2s;
}

.sample-navigation .btn-secondary:hover:not(:disabled) {
  background: #F3F4F6;
  border-color: #3B82F6;
}

.sample-navigation .btn-secondary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.sample-navigation .btn-primary {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  background: #3B82F6;
  color: #fff;
  transition: background 0.2s, transform 0.2s;
}

.sample-navigation .btn-primary:hover {
  background: #2563EB;
  transform: translateY(-1px);
}

/* Sample Completion */
.sample-completion {
  max-width: 600px;
  margin: 0 auto;
  padding: 2rem;
  text-align: center;
}

.completion-icon {
  font-size: 5rem;
  margin-bottom: 1.5rem;
  animation: sampleBounce 0.6s ease;
}

@keyframes sampleBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.sample-completion h2 {
  font-size: 2rem;
  font-weight: 800;
  color: #111827;
  margin-bottom: 1rem;
}

.sample-score {
  margin: 2rem 0;
}

.score-circle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3B82F6, #8B5CF6);
  color: white;
}

#sample-score-text {
  font-size: 2.5rem;
  font-weight: 900;
}

.score-label {
  font-size: 0.875rem;
  font-weight: 600;
  opacity: 0.9;
}

.completion-cta {
  background: linear-gradient(135deg, #F0F9FF, #E0E7FF);
  border-radius: 12px;
  padding: 2rem;
  margin: 2rem 0;
}

.completion-cta h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.btn-cta-large {
  width: 100%;
  background: linear-gradient(135deg, #3B82F6, #8B5CF6);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 1.25rem 2rem;
  font-size: 1.125rem;
  font-weight: 700;
  cursor: pointer;
  margin: 1rem 0;
  transition: transform 0.2s;
}

.btn-cta-large:hover {
  transform: translateY(-2px);
}

.btn-restart-sample {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid #D1D5DB;
  background: #fff;
  color: #374151;
  transition: background 0.2s;
}

.btn-restart-sample:hover {
  background: #F3F4F6;
}

.feature-highlight {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 2rem;
  border: 2px solid #E5E7EB;
}

.feature-highlight h4 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  text-align: left;
}

.feature-grid .feature-item {
  font-size: 0.9375rem;
  color: #374151;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .sample-stats {
    gap: 1rem;
  }

  .sample-navigation {
    flex-direction: column;
  }

  .sample-navigation .btn-secondary,
  .sample-navigation .btn-primary {
    width: 100%;
  }

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

.sample-error-msg {
  color: #EF4444;
  font-size: 0.875rem;
  font-weight: 600;
  margin-top: 0.5rem;
  display: none;
}

.sample-error-msg.visible {
  display: block;
}