/* ============================================
   3DN Lead Magnet - Founder Dependency Score
   Typeform-style Animated Assessment
   ============================================ */

/* CSS Variables - Easy to customize for branding */
:root {
  /* Primary Colors */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;

  /* Secondary/Accent Colors */
  --color-secondary: #0f172a;
  --color-accent: #06b6d4;

  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;

  /* Semantic Colors */
  --color-success: #10b981;
  --color-error: #ef4444;
  --color-warning: #f59e0b;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Transitions - Typeform style timings */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-gray-700);
  background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 50%, var(--color-gray-100) 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ============================================
   Layout
   ============================================ */
.container {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: var(--spacing-md);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  padding: var(--spacing-lg) 0;
  text-align: center;
  opacity: 0;
  animation: fadeSlideDown 0.6s ease forwards;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.logo img {
  height: 80px;
  width: auto;
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--spacing-lg) 0;
}

.footer {
  text-align: center;
  padding: var(--spacing-lg) 0;
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
  opacity: 0;
  animation: fadeIn 0.6s ease 0.3s forwards;
}

/* ============================================
   Card Component
   ============================================ */
.card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  opacity: 0;
  transform: translateY(30px);
  animation: cardEntrance 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  animation-delay: 0.2s;
}

.card-content {
  padding: var(--spacing-xl);
}

@media (min-width: 640px) {
  .card-content {
    padding: var(--spacing-2xl) var(--spacing-3xl);
  }
}

/* ============================================
   Typography
   ============================================ */
.title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-sm);
  text-align: center;
}

@media (min-width: 640px) {
  .title {
    font-size: var(--font-size-3xl);
  }
}

.subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.intro-text {
  font-size: var(--font-size-base);
  color: var(--color-gray-600);
  text-align: center;
  line-height: 1.7;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  padding: 0 var(--spacing-md);
  opacity: 0;
  animation: fadeSlideUp 0.5s ease 0.3s forwards;
}

/* Assessment Info Badges */
.assessment-info {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  opacity: 0;
  animation: fadeSlideUp 0.5s ease 0.4s forwards;
}

.info-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-gray-100);
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-full);
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-sm);
}

.section-description {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   Form Styles
   ============================================ */
.form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeSlideUp 0.5s ease forwards;
}

.form-group:nth-child(1) { animation-delay: 0.5s; }
.form-group:nth-child(2) { animation-delay: 0.6s; }
.form-group:nth-child(3) { animation-delay: 0.7s; }
.form-group:nth-child(4) { animation-delay: 0.8s; }

.form-group label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray-700);
}

.form-group input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-lg);
  font-family: inherit;
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  background: var(--color-white);
  transition: all var(--transition-base);
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
  transform: scale(1.01);
}

.form-group input::placeholder {
  color: var(--color-gray-400);
}

/* ============================================
   Button Styles
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.btn:hover::after {
  transform: translateX(100%);
}

.btn-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.btn:hover .btn-icon {
  transform: translateX(4px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

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

.btn-primary:disabled {
  background: var(--color-gray-300);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-gray-700);
  border: 2px solid var(--color-gray-200);
}

.btn-secondary:hover {
  background: var(--color-gray-50);
  border-color: var(--color-gray-300);
  transform: translateY(-2px);
}

.btn-text {
  background: transparent;
  color: var(--color-gray-500);
  padding: var(--spacing-sm) var(--spacing-md);
}

.btn-text:hover {
  color: var(--color-primary);
}

.btn-full {
  width: 100%;
}

.btn-large {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

/* ============================================
   Progress Bar - Typeform Style
   ============================================ */
.progress-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.progress-bar {
  height: 4px;
  background: var(--color-gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--spacing-xs);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: var(--radius-full);
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0%;
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  background: var(--color-primary);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-primary);
  animation: pulse 2s infinite;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.progress-text {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
}

.btn-icon-left {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-right: var(--spacing-xs);
}

.btn-text:hover .btn-icon-left {
  animation: spin 0.5s ease;
}

.badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================
   Questions - Typeform One-at-a-time Style
   ============================================ */
#questions-section .card-content {
  padding-top: calc(var(--spacing-3xl) + 60px); /* Account for fixed progress bar */
  min-height: 70vh;
  display: flex;
  flex-direction: column;
}

.questions-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: visible;
  min-height: 400px;
}

.question-block {
  display: none;
  flex-direction: column;
  gap: var(--spacing-lg);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.question-block.active {
  display: flex;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  animation: questionFadeIn 0.4s ease forwards;
}

.question-block.exiting {
  display: flex;
  opacity: 0;
  transform: translateY(-20px);
  pointer-events: none;
  animation: questionFadeOut 0.3s ease forwards;
}

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

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

.question-text {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-gray-900);
  line-height: 1.4;
}

@media (min-width: 640px) {
  .question-text {
    font-size: var(--font-size-2xl);
  }
}

.question-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: 700;
  border-radius: var(--radius-full);
  margin-right: var(--spacing-md);
}

.answers-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding-right: var(--spacing-sm);
}

.answer-option {
  position: relative;
  opacity: 0;
  transform: translateX(-20px);
  animation: slideInAnswer 0.4s ease forwards;
}

.answer-option:nth-child(1) { animation-delay: 0.1s; }
.answer-option:nth-child(2) { animation-delay: 0.15s; }
.answer-option:nth-child(3) { animation-delay: 0.2s; }
.answer-option:nth-child(4) { animation-delay: 0.25s; }
.answer-option:nth-child(5) { animation-delay: 0.3s; }

.answer-option input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
}

.answer-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--color-white);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: var(--font-size-base);
  color: var(--color-gray-700);
  position: relative;
  overflow: hidden;
}

.answer-label::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--color-primary);
  transform: scaleY(0);
  transition: transform var(--transition-base);
}

.answer-label .key-hint {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--color-gray-100);
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.answer-label:hover {
  background: var(--color-gray-50);
  border-color: var(--color-primary-light);
  transform: translateX(4px);
}

.answer-label:hover::before {
  transform: scaleY(1);
}

.answer-label:hover .key-hint {
  background: var(--color-primary);
  color: var(--color-white);
}

.answer-option input:checked + .answer-label {
  background: rgba(37, 99, 235, 0.05);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: scale(1.02);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}

.answer-option input:checked + .answer-label::before {
  transform: scaleY(1);
}

.answer-option input:checked + .answer-label .key-hint {
  background: var(--color-primary);
  color: var(--color-white);
  animation: checkBounce 0.4s ease;
}

.answer-option input:focus + .answer-label {
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

/* Question Navigation */
.question-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-gray-100);
}

.nav-hint {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
}

.nav-hint kbd {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-gray-100);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: var(--font-size-xs);
  margin: 0 2px;
}

/* ============================================
   CTA Banner
   ============================================ */
.cta-banner {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-gray-200);
  text-align: center;
}

.cta-banner p {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
}

/* ============================================
   Results - Animated
   ============================================ */
#results-section .card {
  animation: cardEntrance 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.result-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-gray-200);
}

/* Score Display - Animated */
.score-display {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.score-value {
  font-size: 5rem;
  font-weight: 700;
  color: var(--color-gray-900);
  line-height: 1;
  background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-gray-600) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.score-max {
  font-size: var(--font-size-xl);
  color: var(--color-gray-400);
  font-weight: 500;
}

/* Score color variants based on severity */
.score-low .score-value {
  background: linear-gradient(135deg, var(--color-success) 0%, #059669 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.score-moderate .score-value {
  background: linear-gradient(135deg, #eab308 0%, #ca8a04 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.score-high .score-value {
  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.score-critical .score-value {
  background: linear-gradient(135deg, var(--color-error) 0%, #dc2626 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-sm);
  opacity: 0;
  animation: fadeSlideUp 0.5s ease 0.3s forwards;
}

@media (min-width: 640px) {
  .result-title {
    font-size: var(--font-size-2xl);
  }
}

.result-summary {
  font-size: var(--font-size-base);
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
  opacity: 0;
  animation: fadeSlideUp 0.5s ease 0.2s forwards;
}

.result-body {
  margin-bottom: var(--spacing-xl);
}

.result-section {
  margin-bottom: var(--spacing-xl);
  opacity: 0;
  animation: fadeSlideUp 0.5s ease forwards;
}

.result-section:nth-child(1) { animation-delay: 0.4s; }
.result-section:nth-child(2) { animation-delay: 0.5s; }
.result-section:nth-child(3) { animation-delay: 0.6s; }

.result-section h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-gray-800);
  margin-bottom: var(--spacing-md);
}

.result-description {
  color: var(--color-gray-600);
  line-height: 1.7;
  white-space: pre-line;
}

/* Watch For Section */
.watch-for {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.08) 0%, rgba(251, 191, 36, 0.05) 100%);
  border-left: 4px solid var(--color-warning);
  padding: var(--spacing-lg);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.watch-for h3 {
  color: #b45309;
}

.watch-for p {
  color: var(--color-gray-700);
  line-height: 1.7;
  white-space: pre-line;
}

.recommendations {
  background: linear-gradient(135deg, var(--color-gray-50) 0%, rgba(37, 99, 235, 0.02) 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  opacity: 0;
  animation: fadeSlideUp 0.5s ease 0.7s forwards;
}

.recommendations h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-gray-800);
  margin-bottom: var(--spacing-md);
}

.recommendations ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.recommendations li {
  display: flex;
  gap: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  padding: var(--spacing-sm) 0;
  opacity: 0;
  animation: fadeSlideRight 0.4s ease forwards;
}

.recommendations li:nth-child(1) { animation-delay: 0.8s; }
.recommendations li:nth-child(2) { animation-delay: 0.9s; }
.recommendations li:nth-child(3) { animation-delay: 1s; }
.recommendations li:nth-child(4) { animation-delay: 1.1s; }

.recommendations li::before {
  content: '';
  width: 20px;
  height: 20px;
  background: var(--color-success);
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpath d='M5 13l4 4L19 7'/%3E%3C/svg%3E");
  background-size: 12px;
  background-repeat: no-repeat;
  background-position: center;
}

.result-cta {
  text-align: center;
  padding: var(--spacing-xl);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  opacity: 0;
  animation: fadeSlideUp 0.5s ease 1.2s forwards;
}

.cta-message {
  font-size: var(--font-size-lg);
  color: var(--color-gray-700);
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
}

#restart-btn {
  display: block;
  margin: 0 auto;
  opacity: 0;
  animation: fadeIn 0.5s ease 1.3s forwards;
}

/* ============================================
   Loading State
   ============================================ */
.loading {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-lg);
  z-index: 100;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--color-gray-200);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading p {
  color: var(--color-gray-600);
  font-weight: 500;
  animation: fadeInOut 1.5s ease infinite;
}

/* ============================================
   Toast / Error Message
   ============================================ */
.toast {
  position: fixed;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-error);
  color: var(--color-white);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  z-index: 200;
  max-width: calc(100% - var(--spacing-xl) * 2);
  animation: slideUpToast 0.4s ease forwards;
}

.toast.hidden {
  animation: slideDownToast 0.4s ease forwards;
}

.toast-close {
  background: none;
  border: none;
  color: var(--color-white);
  font-size: var(--font-size-xl);
  cursor: pointer;
  opacity: 0.8;
  padding: 0;
  line-height: 1;
  transition: opacity var(--transition-fast);
}

.toast-close:hover {
  opacity: 1;
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
  display: none !important;
}

.form-actions {
  margin-top: var(--spacing-lg);
  opacity: 0;
  animation: fadeSlideUp 0.5s ease 0.9s forwards;
}

/* ============================================
   Animations - Typeform Style
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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

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

@keyframes cardEntrance {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

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

@keyframes checkBounce {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.2); }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 10px var(--color-primary);
  }
  50% {
    opacity: 0.7;
    box-shadow: 0 0 20px var(--color-primary);
  }
}

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

@keyframes fadeInOut {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

@keyframes slideUpToast {
  from { transform: translateX(-50%) translateY(100px); }
  to { transform: translateX(-50%) translateY(0); }
}

@keyframes slideDownToast {
  from { transform: translateX(-50%) translateY(0); }
  to { transform: translateX(-50%) translateY(100px); }
}

/* ============================================
   Responsive Adjustments
   ============================================ */
@media (max-width: 480px) {
  :root {
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
  }

  .container {
    padding: var(--spacing-sm);
  }

  .card-content {
    padding: var(--spacing-lg);
  }

  .btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
  }

  .score-value {
    font-size: 4rem;
  }

  .progress-container {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .progress-header {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

  .answer-label .key-hint {
    display: none;
  }

  #start-over-btn .btn-icon-left {
    display: none;
  }
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .progress-fill::after {
    animation: none;
  }
}