/* UAV: Part 107 Exam Prep Legal Pages — Shared Stylesheet */

/* ─── Design Tokens ─────────────────────────────────────────────────────── */
:root {
  --color-primary:        #2563EB;
  --color-accent:         #F97316;
  --color-bg-page:        #F8FAFC;
  --color-bg-surface:     #FFFFFF;
  --color-bg-subtle:      #F1F5F9;
  --color-text-primary:   #0F172A;
  --color-text-secondary: #475569;
  --color-text-muted:     #64748B;
  --color-border:         #CBD5E1;
  --shadow-card:          0 4px 12px rgba(0, 0, 0, 0.08);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --font-base: -apple-system, 'SF Pro Display', system-ui, sans-serif;
  --content-max-width: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary:        #3B82F6;
    --color-accent:         #FDBA74;
    --color-bg-page:        #0F172A;
    --color-bg-surface:     #1E293B;
    --color-bg-subtle:      #334155;
    --color-text-primary:   #F1F5F9;
    --color-text-secondary: #94A3B8;
    --color-text-muted:     #64748B;
    --color-border:         #475569;
    --shadow-card:          0 4px 12px rgba(0, 0, 0, 0.4);
  }
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-base);
  background-color: var(--color-bg-page);
  color: var(--color-text-primary);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Site Header ───────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.site-header__inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.site-logo__icon {
  font-size: 1.2rem;
  line-height: 1;
}

/* ─── Content Wrapper ───────────────────────────────────────────────────── */
.content-wrapper {
  flex: 1;
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 40px 24px;
}

/* ─── Legal Document Card ───────────────────────────────────────────────── */
.legal-document {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

/* ─── Document Header ───────────────────────────────────────────────────── */
.document-header {
  background-color: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border);
  padding: 32px 40px;
}

.document-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 8px;
}

.last-updated {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ─── Document Body ─────────────────────────────────────────────────────── */
.document-body {
  padding: 40px;
}

/* ─── Legal Sections ────────────────────────────────────────────────────── */
.legal-section {
  margin-bottom: 36px;
}

.legal-section:last-child {
  margin-bottom: 0;
}

.legal-section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 12px;
  padding-left: 14px;
  position: relative;
}

.legal-section h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 2px;
  bottom: 2px;
  width: 3px;
  border-radius: 2px;
  background-color: var(--color-accent);
}

.legal-section p {
  font-size: 0.925rem;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.legal-section p:last-child {
  margin-bottom: 0;
}

.legal-section ul,
.legal-section ol {
  font-size: 0.925rem;
  color: var(--color-text-secondary);
  padding-left: 20px;
  margin-bottom: 12px;
}

.legal-section li {
  margin-bottom: 6px;
}

.legal-section a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color 0.15s;
}

.legal-section a:hover {
  text-decoration-color: var(--color-primary);
}

.legal-section h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-top: 16px;
  margin-bottom: 8px;
}

.legal-section blockquote {
  border-left: 3px solid var(--color-accent);
  background-color: var(--color-bg-subtle);
  margin: 12px 0;
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* ─── Legal Tables ──────────────────────────────────────────────────────── */
.legal-table-wrap {
  overflow-x: auto;
  margin-bottom: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.legal-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.legal-table th {
  background-color: var(--color-bg-subtle);
  color: var(--color-text-primary);
  font-weight: 600;
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.legal-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.legal-table tr:last-child td {
  border-bottom: none;
}

.legal-table tr:nth-child(even) td {
  background-color: var(--color-bg-page);
}

/* ─── Site Footer ───────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-surface);
  padding: 24px;
}

.site-footer__inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer__copyright {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.site-footer__nav {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
}

.site-footer__nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.15s;
}

.site-footer__nav a:hover {
  color: var(--color-primary);
}

.site-footer__nav__sep {
  color: var(--color-border);
  user-select: none;
}

/* ─── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .content-wrapper {
    padding: 24px 16px;
  }

  .document-header {
    padding: 24px 24px;
  }

  .document-header h1 {
    font-size: 1.4rem;
  }

  .document-body {
    padding: 24px 24px;
  }
}

@media (max-width: 480px) {
  .site-header__inner {
    padding: 0 16px;
    height: 52px;
  }

  .site-logo {
    font-size: 0.95rem;
  }

  .content-wrapper {
    padding: 16px 12px;
  }

  .document-header {
    padding: 20px 16px;
  }

  .document-header h1 {
    font-size: 1.25rem;
  }

  .document-body {
    padding: 20px 16px;
  }

  .legal-section h2 {
    font-size: 1rem;
  }

  .site-footer__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}