/* nav.css — shared navigation styling for Right Advance Digital
   Implements Phase 1 brand identity (ink + paper + oxblood) */

:root {
  --ink: #0B0B0C;
  --paper: #FAFAF7;
  --oxblood: #6B1F2D;
  --oxblood-deep: #4A1620;
  --oxblood-on-dark: #D06080;
  --rule: #E6E2D9;
  --muted: #5C5C5F;
  --quiet: #F2EFE8;
  --white: #FFFFFF;

  /* Type scale — see .planning/typography_scale.md */
  --fs-hero: clamp(2.5rem, 5vw, 4rem);
  --fs-h1: clamp(2rem, 4vw, 2.75rem);
  --fs-h2: 1.75rem;        /* 28px */
  --fs-h3: 1.375rem;       /* 22px */
  --fs-h4: 1.25rem;        /* 20px */
  --fs-body-lg: 1.125rem;  /* 18px */
  --fs-body: 1rem;         /* 16px — floor for body-adjacent text */
  --fs-small: 0.875rem;    /* 14px — UI/meta, not body sentences */
  --fs-label: 12px;        /* floor for mono caps tracked labels */
  --fs-code: 0.875rem;     /* 14px */

  --lh-display: 1.05;
  --lh-h1: 1.1;
  --lh-h2: 1.15;
  --lh-h3: 1.25;
  --lh-h4: 1.3;
  --lh-body: 1.55;
  --lh-small: 1.45;
  --lh-label: 1.3;
}

#site-nav {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  font-family: 'Source Sans 3', -apple-system, sans-serif;
  position: relative;
  z-index: 100;
}
.site-nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 32px;
}

.site-nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}

.site-nav-logo-text {
  font-family: 'Source Serif 4', serif;
  font-weight: 700;
  font-size: var(--fs-body-lg);
  line-height: var(--lh-h4);
  letter-spacing: -0.015em;
}

.site-nav-logo-text span {
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 500;
  font-size: var(--fs-label);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 2px;
}

.site-nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav-link {
  font-size: var(--fs-small);
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
}

.site-nav-link:hover {
  color: var(--oxblood);
}

.site-nav-link--active {
  color: var(--oxblood);
  border-bottom: 1px solid var(--oxblood);
  padding-bottom: 2px;
}

.site-nav-cta {
  background: var(--oxblood);
  color: var(--paper);
  padding: 10px 18px;
  text-decoration: none;
  font-size: var(--fs-small);
  font-weight: 600;
}

.site-nav-cta:hover {
  background: var(--oxblood-deep);
}

/* Breadcrumb */
#site-breadcrumb {
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  font-family: 'IBM Plex Mono', monospace;
  font-size: var(--fs-label);
  color: var(--muted);
  letter-spacing: 0.04em;
}
.site-bc-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px 32px;
}

.site-bc-link {
  color: var(--muted);
  text-decoration: none;
}

.site-bc-link:hover {
  color: var(--oxblood);
}

.site-bc-current {
  color: var(--ink);
}

.site-bc-sep {
  margin: 0 8px;
  color: var(--rule);
}

/* Mobile */
.nav-hamburger-btn { display: none; }
#nav-mobile-overlay { display: none; }

@media (max-width: 768px) {
  .site-nav-links { display: none; }
  .site-nav-cta { display: none; }

  .nav-hamburger-btn {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
  }
  .hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--ink);
  }

  #nav-mobile-overlay {
    position: fixed;
    inset: 0;
    background: var(--paper);
    display: none;
    flex-direction: column;
    padding: 64px 32px;
    z-index: 99;
  }
  #nav-mobile-overlay.is-open { display: flex; }

  .nav-mobile-links {
    list-style: none;
    padding: 0;
    margin: 0 0 32px;
  }
  .nav-mobile-link {
    display: block;
    padding: 16px 0;
    font-family: 'Source Serif 4', serif;
    font-size: var(--fs-h4);
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px solid var(--rule);
  }
  .nav-mobile-link--active {
    color: var(--oxblood);
    border-left: 3px solid var(--oxblood);
    padding-left: 12px;
  }
  .nav-mobile-cta {
    margin-top: 24px;
    padding: 16px 24px;
    background: var(--oxblood);
    color: var(--paper);
    text-align: center;
    text-decoration: none;
    font-weight: 600;
  }
}