/* ==========================================================================
   DESIGN TOKENS - Light theme, WCAG AA compliant
   Derived from The Brick Dev design system
   ========================================================================== */
:root {
  /* Backgrounds */
  --bg-primary: #FAF7F2;
  --bg-secondary: #F4F0E9;
  --bg-card: #FFFFFF;
  --bg-elevated: #FDFBF6;

  /* Text - all pass WCAG AA on light backgrounds */
  --text-primary: #1A1614;
  --text-secondary: #4A4340;
  --text-muted: #6B625D;
  --text-subtle: #A09890;

  /* Brand accent */
  --accent: #c54b1a;
  --accent-hover: #d95a28;
  --accent-dark: #a33d12;
  --accent-light: #f8ebe4;
  --accent-muted: rgba(197, 75, 26, 0.08);
  --accent-secondary: #3d1a1a;

  /* Borders */
  --border: rgba(26, 22, 20, 0.08);
  --border-strong: rgba(26, 22, 20, 0.15);

  /* Status */
  --success: #059669;
  --warning: #d97706;

  /* Typography */
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  /* Layout */
  --max-w-reading: 780px;
  --max-w-container: 1200px;
  --header-h: 64px;
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
@media (min-width: 768px) {
  body { font-size: 17px; }
}

/* Focus states for accessibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Skip to content for keyboard users */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent-dark);
  color: white;
  padding: 12px 20px;
  text-decoration: none;
  font-weight: 600;
  z-index: 1000;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ==========================================================================
   HEADER
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(250, 247, 242, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
  display: flex;
  align-items: center;
}
.header-inner {
  width: 100%;
  max-width: var(--max-w-container);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}
.brand-mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.brand-name {
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}
.brand-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 2px;
}
.header-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  display: flex;
  gap: 12px;
  align-items: center;
}
.header-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--accent-muted);
  color: var(--accent-dark);
  border-radius: 4px;
  font-weight: 600;
}
@media (max-width: 640px) {
  .header-meta-full { display: none; }
}
@media (min-width: 641px) {
  .header-meta-badge-mobile { display: none; }
}

/* ==========================================================================
   COVER HERO
   ========================================================================== */
.cover {
  padding: 60px 20px 80px;
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.cover-inner {
  max-width: var(--max-w-container);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.cover-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.cover-eyebrow::before {
  content: '';
  display: inline-block;
  width: 32px;
  height: 2px;
  background: var(--accent);
}
.cover-title {
  font-size: clamp(36px, 7vw, 68px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 28px;
  color: var(--text-primary);
  max-width: 900px;
}
.cover-title-accent {
  color: var(--accent);
  display: inline-block;
  position: relative;
}
.cover-title-accent::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 3px;
  background: var(--accent);
  opacity: 0.25;
}
.cover-thesis {
  font-size: clamp(16px, 2.2vw, 20px);
  line-height: 1.55;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 0 48px;
}
.cover-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
  max-width: 720px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.cover-meta-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cover-meta-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
}
.cover-meta-value {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

/* Decorative brick pattern - signature element */
.cover-bricks {
  position: absolute;
  right: -40px;
  top: 40px;
  opacity: 0.08;
  pointer-events: none;
}
@media (max-width: 768px) {
  .cover-bricks { display: none; }
}

/* ==========================================================================
   TABLE OF CONTENTS
   ========================================================================== */
.toc {
  max-width: var(--max-w-reading);
  margin: 60px auto 40px;
  padding: 0 20px;
}
.toc-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
  margin: 0 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
}
@media (min-width: 640px) {
  .toc-list { grid-template-columns: 1fr 1fr; gap: 4px 32px; }
}
.toc-item a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px 10px 8px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 6px;
  font-size: 15px;
  transition: all 150ms ease;
}
.toc-item a:hover {
  background: var(--accent-muted);
  color: var(--accent-dark);
}
.toc-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 24px;
  flex-shrink: 0;
}
.toc-item a:hover .toc-num { color: var(--accent); }

/* ==========================================================================
   SECTIONS
   ========================================================================== */
main { padding-bottom: 80px; }

.section {
  max-width: var(--max-w-reading);
  margin: 0 auto;
  padding: 56px 20px;
  scroll-margin-top: calc(var(--header-h) + 16px);
}
@media (min-width: 768px) {
  .section { padding: 72px 20px; }
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 8px;
  background: var(--accent-muted);
  color: var(--accent-dark);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
}
.section-title {
  font-size: clamp(28px, 4.5vw, 42px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
  color: var(--text-primary);
}
.section-lead {
  font-size: 18px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0 0 32px;
  max-width: 680px;
}

/* Phase sections get special treatment */
.phase-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: var(--accent-secondary);
  color: #F4F0E9;
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 20px;
}
.phase-eyebrow::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}
.phase-weeks {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 20px;
}

/* Section divider - the signature brick motif */
.section-divider {
  max-width: var(--max-w-reading);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 40px;
}
.divider-bricks {
  display: flex;
  flex-direction: column;
  gap: 3px;
  opacity: 0.4;
}
.divider-row {
  display: flex;
  gap: 3px;
}
.divider-brick {
  height: 6px;
  border-radius: 1.5px;
  background: var(--accent);
}
.divider-brick.dark {
  background: var(--accent-secondary);
}

/* ==========================================================================
   CONTENT STYLES (prose)
   ========================================================================== */
.prose h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 40px 0 16px;
  letter-spacing: -0.01em;
}
.prose h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 12px;
}
.prose p {
  margin: 0 0 16px;
  color: var(--text-secondary);
  max-width: 680px;
}
.prose p strong {
  color: var(--text-primary);
  font-weight: 700;
}
.prose ul, .prose ol {
  margin: 0 0 20px;
  padding-left: 24px;
  max-width: 680px;
}
.prose li {
  margin-bottom: 8px;
  color: var(--text-secondary);
}
.prose li strong {
  color: var(--text-primary);
  font-weight: 700;
}
.prose ul li::marker {
  color: var(--accent);
}
.prose ol li::marker {
  color: var(--accent);
  font-weight: 600;
  font-family: var(--font-mono);
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--text-primary);
}

/* Model cards for fulfilment section */
.model-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 24px 0;
  transition: border-color 200ms ease;
}
.model-card:hover {
  border-color: var(--border-strong);
}
.model-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.model-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 12px;
  background: var(--accent-dark);
  color: white;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.05em;
}
.model-badge.tactical { background: var(--accent-secondary); }
.model-badge.amazon { background: var(--text-primary); }
.model-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  flex: 1;
}
.model-tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--accent-muted);
  color: var(--accent-dark);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  margin-left: auto;
}

/* Callout / info blocks */
.callout {
  background: var(--accent-muted);
  border-left: 3px solid var(--accent);
  padding: 20px 24px;
  border-radius: 0 8px 8px 0;
  margin: 28px 0;
}
.callout p {
  margin: 0;
  color: var(--text-primary);
  font-size: 15px;
}
.callout-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-dark);
  font-weight: 600;
  margin-bottom: 8px;
  display: block;
}

/* Success metrics card */
.metrics-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 32px 0;
}
.metrics-card-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 16px;
}
.metrics-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.metrics-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  font-weight: 500;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.metrics-list li:last-child { border-bottom: none; }
.metrics-list li::before {
  content: '✓';
  color: var(--success);
  font-weight: 700;
  flex-shrink: 0;
}

/* Portal module cards */
.module-grid {
  display: grid;
  gap: 16px;
  margin: 24px 0;
}
.module-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}
.module-name {
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 10px;
  font-size: 16px;
}
.module-card ul {
  margin: 0;
  padding-left: 20px;
}
.module-card li {
  font-size: 14px;
  margin-bottom: 6px;
}

/* ==========================================================================
   OPEN QUESTIONS INTERACTIVE
   ========================================================================== */
.questions-intro {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 24px 0 32px;
}
.questions-intro p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 15px;
}
.question-group {
  margin: 32px 0;
}
.question-group-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.question {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  margin-bottom: 12px;
  transition: border-color 200ms ease;
}
.question:focus-within {
  border-color: var(--accent);
}
.question-text {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin-bottom: 12px;
}
.question-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
  font-size: 13px;
  flex-shrink: 0;
  min-width: 24px;
}
.question-label {
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.5;
  flex: 1;
}
.question-input {
  width: 100%;
  min-height: 60px;
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--bg-primary);
  font-family: inherit;
  font-size: 15px;
  color: var(--text-primary);
  resize: vertical;
  transition: border-color 150ms ease;
}
.question-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--bg-card);
}
.question-input::placeholder {
  color: var(--text-subtle);
}

.copy-answers-wrap {
  margin-top: 40px;
  padding: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: center;
}
.copy-answers-wrap p {
  margin: 0 0 16px;
  color: var(--text-secondary);
  font-size: 15px;
}
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  min-height: 44px;
  background: var(--accent-dark);
  color: white;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 200ms ease;
}
.copy-btn:hover {
  background: var(--accent);
  transform: translateY(-1px);
}
.copy-btn.copied {
  background: var(--success);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 20px 60px;
  background: var(--bg-secondary);
  margin-top: 60px;
}
.footer-inner {
  max-width: var(--max-w-container);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer-brand-mark {
  width: 24px;
  height: 24px;
}
.footer-brand-text {
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}
.footer-brand-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.footer-email {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 150ms ease;
}
.footer-email:hover {
  color: var(--accent);
}
.footer-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ==========================================================================
   PRINT STYLES
   ========================================================================== */
@media print {
  .site-header, .site-footer, .copy-answers-wrap { display: none; }
  body { background: white; color: black; }
  .section { page-break-inside: avoid; padding: 30px 0; }
  .cover { padding: 30px 0; }
  a { color: black; text-decoration: underline; }
}

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