/* ==========================================================================
   FMCSA Safety App - Milemarker Theme
   Demo Slice 001

   Layers Applied:
   - brand.md: Working palette (reds, golds, greens)
   - voice.md: 5th grade reading level, direct
   - ui.md: Mobile-first, one screen one job
   - web.md: Pure CSS, no build step, WCAG AA
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables (from brand.md working palette)
   -------------------------------------------------------------------------- */
:root {
  /* Brand Colors */
  --color-primary: #c53030;
  --color-primary-dark: #9b2c2c;
  --color-primary-light: #fc8181;

  /* Status Colors */
  --color-success: #48bb78;
  --color-success-dark: #38a169;
  --color-warning: #ed8936;
  --color-info: #4299e1;

  /* Recognition Colors */
  --color-gold: #d69e2e;
  --color-gold-light: #faf089;

  /* Neutral */
  --color-dark: #1a202c;
  --color-gray-800: #2d3748;
  --color-gray-600: #718096;
  --color-gray-400: #a0aec0;
  --color-gray-200: #e2e8f0;
  --color-gray-100: #f7fafc;
  --color-white: #ffffff;

  /* Placeholder Highlight */
  --color-placeholder: #fefcbf;
  --color-placeholder-border: #d69e2e;

  /* Road Theme */
  --color-road: #2d3748;
  --color-road-line: #f7fafc;
  --color-road-shoulder: #4a5568;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --line-height: 1.6;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

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

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-dark);
  background: var(--color-gray-100);
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Focus states for accessibility */
:focus {
  outline: 3px solid var(--color-info);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--color-info);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }

p {
  margin: 0 0 var(--space-4);
}

.text-center { text-align: center; }
.text-muted { color: var(--color-gray-600); }
.text-small { font-size: 0.875rem; }

/* --------------------------------------------------------------------------
   Placeholder Content (Yellow Highlight)
   -------------------------------------------------------------------------- */
.placeholder-content {
  background: var(--color-placeholder);
  border-left: 4px solid var(--color-placeholder-border);
  padding: var(--space-4);
  margin: var(--space-4) 0;
  border-radius: var(--radius-sm);
}

.placeholder-content::before {
  content: "📝 Placeholder Content";
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

/* Inline placeholder */
.placeholder-inline {
  background: var(--color-placeholder);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-content {
  flex: 1;
  padding: var(--space-8) 0;
}

/* --------------------------------------------------------------------------
   Header / Navigation
   -------------------------------------------------------------------------- */
.header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.logo-icon {
  font-size: 1.5rem;
}

.nav-link {
  color: var(--color-gray-600);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all 0.2s;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-gray-100);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   Hero Section (Road Theme)
   -------------------------------------------------------------------------- */
.hero {
  background: linear-gradient(135deg, var(--color-road) 0%, var(--color-gray-800) 100%);
  color: var(--color-white);
  padding: var(--space-16) 0;
  position: relative;
  overflow: hidden;
}

/* Road lines decoration */
.hero::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 40px,
    var(--color-road-line) 40px,
    var(--color-road-line) 80px,
    transparent 80px,
    transparent 120px
  );
  opacity: 0.3;
}

.hero h1 {
  margin-bottom: var(--space-4);
}

.hero p {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  max-width: 600px;
}

.hero .placeholder-content {
  background: rgba(254, 252, 191, 0.9);
  color: var(--color-dark);
}

/* --------------------------------------------------------------------------
   Milemarker Progress Indicator
   -------------------------------------------------------------------------- */
.milemarker-progress {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-6) 0;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
}

.milestone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  min-width: 80px;
}

.milestone-marker {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  transition: all 0.3s;
}

.milestone-marker.completed {
  background: var(--color-success);
  color: var(--color-white);
}

.milestone-marker.active {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 0 0 4px var(--color-primary-light);
}

.milestone-marker.inactive {
  background: var(--color-gray-200);
  color: var(--color-gray-600);
}

.milestone-label {
  font-size: 0.75rem;
  color: var(--color-gray-600);
  text-align: center;
}

.milestone-connector {
  width: 30px;
  height: 3px;
  background: var(--color-gray-200);
}

.milestone-connector.completed {
  background: var(--color-success);
}

/* --------------------------------------------------------------------------
   Module Cards (Landing Page)
   -------------------------------------------------------------------------- */
.module-grid {
  display: grid;
  gap: var(--space-6);
  margin: var(--space-8) 0;
}

.module-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  border: 2px solid transparent;
  transition: all 0.3s;
}

.module-card:hover:not(.module-card--inactive) {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.module-card--inactive {
  opacity: 0.6;
  cursor: not-allowed;
}

.module-card--inactive:hover {
  transform: none;
}

.module-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.875rem;
  margin-bottom: var(--space-3);
}

.module-card--inactive .module-number {
  background: var(--color-gray-400);
}

.module-card h3 {
  margin-bottom: var(--space-2);
}

.module-card p {
  color: var(--color-gray-600);
  margin-bottom: var(--space-4);
}

.module-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.module-badge--active {
  background: var(--color-success);
  color: var(--color-white);
}

.module-badge--coming {
  background: var(--color-gray-200);
  color: var(--color-gray-600);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  min-height: 48px; /* Touch target */
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
}

.btn-secondary {
  background: var(--color-gray-200);
  color: var(--color-dark);
}

.btn-secondary:hover {
  background: var(--color-gray-400);
}

.btn-success {
  background: var(--color-success);
  color: var(--color-white);
}

.btn-success:hover {
  background: var(--color-success-dark);
  color: var(--color-white);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

/* --------------------------------------------------------------------------
   Quiz Components
   -------------------------------------------------------------------------- */
.quiz-container {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-6) 0;
  box-shadow: var(--shadow-md);
}

.quiz-question {
  margin-bottom: var(--space-6);
}

.quiz-question-number {
  display: inline-block;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.quiz-question h3 {
  margin-bottom: var(--space-4);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-gray-100);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  min-height: 56px; /* Touch target */
}

.quiz-option:hover:not(.disabled) {
  border-color: var(--color-primary);
  background: var(--color-white);
}

.quiz-option.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: rgba(72, 187, 120, 0.1);
}

.quiz-option.incorrect {
  border-color: var(--color-primary);
  background: rgba(197, 48, 48, 0.1);
}

.quiz-option.disabled {
  cursor: default;
}

.quiz-option-letter {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-white);
  border: 2px solid var(--color-gray-400);
  border-radius: var(--radius-full);
  font-weight: 600;
  flex-shrink: 0;
}

.quiz-option.selected .quiz-option-letter {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.quiz-option.correct .quiz-option-letter {
  background: var(--color-success);
  border-color: var(--color-success);
  color: var(--color-white);
}

.quiz-feedback {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  margin-top: var(--space-4);
}

.quiz-feedback.correct {
  background: rgba(72, 187, 120, 0.1);
  border-left: 4px solid var(--color-success);
}

.quiz-feedback.incorrect {
  background: rgba(197, 48, 48, 0.1);
  border-left: 4px solid var(--color-primary);
}

.quiz-feedback-icon {
  font-size: 1.5rem;
  margin-right: var(--space-2);
}

/* --------------------------------------------------------------------------
   Content Sections
   -------------------------------------------------------------------------- */
.content-section {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-6) 0;
  box-shadow: var(--shadow-sm);
}

.content-section h2 {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.section-icon {
  font-size: 1.5rem;
}

/* --------------------------------------------------------------------------
   Coming Soon Overlay
   -------------------------------------------------------------------------- */
.coming-soon-wrapper {
  position: relative;
}

.coming-soon-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  z-index: 10;
}

.coming-soon-badge {
  background: var(--color-gray-800);
  color: var(--color-white);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--font-size-lg);
}

.coming-soon-text {
  color: var(--color-gray-600);
  margin-top: var(--space-3);
}

/* --------------------------------------------------------------------------
   Certificate Preview
   -------------------------------------------------------------------------- */
.certificate-preview {
  background: linear-gradient(135deg, var(--color-gold-light) 0%, var(--color-white) 100%);
  border: 3px solid var(--color-gold);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
}

.certificate-preview h2 {
  color: var(--color-gold);
  margin-bottom: var(--space-4);
}

.certificate-icon {
  font-size: 4rem;
  margin-bottom: var(--space-4);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background: var(--color-dark);
  color: var(--color-gray-400);
  padding: var(--space-6) 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer a {
  color: var(--color-gray-400);
}

.footer a:hover {
  color: var(--color-white);
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

.flex { display: flex; }
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }

.hidden { display: none; }

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  h1 { font-size: var(--font-size-2xl); }
  h2 { font-size: var(--font-size-xl); }

  .hero {
    padding: var(--space-8) 0;
  }

  .milemarker-progress {
    flex-wrap: wrap;
    gap: var(--space-4);
  }

  .milestone-connector {
    display: none;
  }

  .header-inner {
    flex-direction: column;
    gap: var(--space-3);
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}