/* ============================================================
   DESIGN SYSTEM — ROB COOPER MEDIA
   Shared across every page: reset, design tokens, nav, footer,
   and the primary button. Page-specific rules live in each
   page's own stylesheet (/assets/css/{page}.css).
   Do not duplicate rules from this file on individual pages.
============================================================ */
:root {
  --color-slate:          #1E2D3D;
  --color-slate-deep:     #162230;   /* deepest sections */
  --color-slate-mid:      #2C3E50;
  --color-slate-light:    #4A6278;
  --color-amber:          #C9933A;
  --color-amber-light:    #E0B060;
  --color-cream:          #F0EBE0;
  --color-cream-dark:     #E8E2D8;
  --color-text-on-dark:   #E8E2D8;   /* alias — body text on dark surfaces */
  --color-charcoal:       #2C2C2C;
  --color-charcoal-mid:   #4A4A4A;
  --color-charcoal-light: #7A7A7A;
  --color-white:          #FFFFFF;
  --color-error:          #C0392B;   /* forms only */
  --color-error-bg:       #FDECEA;   /* forms only */
  --color-success:        #1E6B3C;   /* forms only */
  --color-success-bg:     #EAF6EF;   /* forms only */

  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body:    'Libre Franklin', system-ui, sans-serif;
  --font-label:   'Libre Franklin', system-ui, sans-serif;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  2rem;
  --text-4xl:  2.75rem;
  --text-5xl:  3.75rem;

  --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;
  --space-24: 6rem;

  --max-width: 1100px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-charcoal);
  background: var(--color-cream);
}
img { display: block; max-width: 100%; }
a   { color: inherit; text-decoration: none; }

/* ============================================================
   NAVIGATION
============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: var(--space-4) var(--space-8);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-4);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}
.nav.scrolled {
  background: rgba(30,45,61,0.97);
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}
.nav-logo {
  grid-column: 1;
  justify-self: start;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-white);
  letter-spacing: -0.01em;
}
.nav-logo span { color: var(--color-amber); }
.nav-toggle {
  grid-column: 2;
  justify-self: center;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
}
.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.nav-toggle-bar:not(:last-child) { margin-bottom: 5px; }
.nav.nav-open .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.nav-open .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav.nav-open .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.nav-links {
  grid-column: 2;
  justify-self: center;
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}
.nav-links a {
  font-family: var(--font-label);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.65);
  transition: color var(--transition-fast);
}
.nav-links a:hover { color: var(--color-white); }
.nav-links a.active { color: var(--color-amber); }
.nav-cta {
  grid-column: 3;
  justify-self: end;
  font-family: var(--font-label);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-amber);
  border: 1px solid var(--color-amber);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.nav-cta:hover { background: var(--color-amber); color: var(--color-slate); }

/* ============================================================
   PRIMARY BUTTON
============================================================ */
.btn-primary {
  font-family: var(--font-label);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: var(--space-3) var(--space-8);
  background: var(--color-amber);
  color: var(--color-slate);
  border: 1px solid var(--color-amber);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
  display: inline-block;
}
.btn-primary:hover { background: var(--color-amber-light); border-color: var(--color-amber-light); transform: translateY(-1px); }

/* ============================================================
   FOOTER
============================================================ */
.footer {
  background: var(--color-slate);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: var(--space-8);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.footer-logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: rgba(255,255,255,0.6);
  flex: 1 0 0;
}
.footer-logo span { color: var(--color-amber); }
.footer > nav { flex: 0 0 auto; }
.footer-nav {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}
.footer-nav a {
  font-family: var(--font-label);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--transition-fast);
}
.footer-nav a:hover { color: rgba(255,255,255,0.65); }
.footer-copy {
  font-family: var(--font-label);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.25);
  letter-spacing: 0.04em;
  flex: 1 0 0;
  text-align: right;
}

/* ============================================================
   SHARED RESPONSIVE / MOTION RULES
   Page-specific breakpoint rules live in each page's own
   stylesheet; only nav/footer/button behaviour is shared here.
============================================================ */
@media (max-width: 640px) {
  .nav { padding: var(--space-4); }
  .nav-toggle { display: flex; }
  .nav-links {
    grid-column: 1 / -1;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 160px;
    max-width: calc(100vw - var(--space-8));
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(30,45,61,0.98);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--transition-base), opacity var(--transition-base);
  }
  .nav.nav-open .nav-links {
    max-height: 300px;
    opacity: 1;
  }
  .nav-links a {
    display: block;
    text-align: left;
    padding: var(--space-4) var(--space-8);
    border-top: 1px solid rgba(255,255,255,0.06);
  }
  .nav-links li:first-child a { border-top: none; }
  .footer { flex-direction: column; align-items: flex-start; padding: var(--space-8) var(--space-4); }
  .footer-nav { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn-primary { transition: none; }
  .nav-links, .nav-toggle-bar { transition: none; }
}