/* ============================================================
   styles.css — Optum Advisory Margin Transformation Site
   Version: 1.0 | Handoff to Antigravity
   Brand reference: brand.optum.com
   ============================================================ */

/* ── DESIGN TOKENS ── */
:root {
  --color-orange:      #FF612B;  /* Primary CTA, buttons, accents */
  --color-navy:        #002677;  /* Hero, nav, footer backgrounds */
  --color-light-blue:  #D9F6FA;  /* Alternating section backgrounds */
  --color-off-white:   #FBF9F4;  /* Page background */
  --color-gray:        #5A5A5A;  /* Body text */
  --color-white:       #FFFFFF;
  --color-red-muted:   #C0392B;  /* Pain point accents (left columns) */

  --font-family:       'OptumSans', Arial, sans-serif;
  --font-size-base:    16px;
  --font-size-h1:      clamp(2rem, 5vw, 3.25rem);
  --font-size-h2:      clamp(1.5rem, 3vw, 2.25rem);
  --font-size-h3:      1.25rem;

  --spacing-section:   5rem;
  --spacing-card-gap:  1.5rem;
  --border-radius:     8px;
  --max-width:         1200px;
  --transition:        0.2s ease;
}

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

html { font-size: var(--font-size-base); scroll-behavior: smooth; }

body {
  font-family: var(--font-family);
  color: var(--color-gray);
  background-color: var(--color-off-white);
  line-height: 1.6;
}

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

a { color: inherit; text-decoration: none; }

/* ── CONTAINER ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── TYPOGRAPHY ── */
h1 { font-size: var(--font-size-h1); font-weight: 700; line-height: 1.15; }
h2 { font-size: var(--font-size-h2); font-weight: 700; line-height: 1.2; }
h3 { font-size: var(--font-size-h3); font-weight: 600; }

.section-title {
  text-align: center;
  color: var(--color-navy);
  margin-bottom: 2.5rem;
}

/* ── BUTTONS ── */
.btn-primary {
  display: inline-block;
  background-color: var(--color-orange);
  color: var(--color-white);
  padding: 0.85rem 2rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 1rem;
  transition: background-color var(--transition);
}
.btn-primary:hover { background-color: #e0541f; }

.btn-secondary {
  display: inline-block;
  border: 2px solid var(--color-navy);
  color: var(--color-navy);
  padding: 0.75rem 1.75rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  transition: all var(--transition);
}
.btn-secondary:hover {
  background-color: var(--color-navy);
  color: var(--color-white);
}

.text-link {
  color: var(--color-orange);
  font-weight: 600;
  transition: opacity var(--transition);
}
.text-link:hover { opacity: 0.8; }

/* ── NAVIGATION ── */
.site-header {
  background-color: var(--color-navy);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-white);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--color-orange); }

.nav-cta-btn {
  background-color: var(--color-orange) !important;
  color: var(--color-white) !important;
  padding: 0.5rem 1.25rem;
  border-radius: var(--border-radius);
  font-weight: 600 !important;
}
.nav-cta-btn:hover { background-color: #e0541f !important; }

.nav-hamburger {
  display: none; /* shown on mobile via media query */
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
}

/* ── HERO ── */
.hero {
  background-color: var(--color-navy);
  /* Background image — Antigravity to apply approved Optum photography */
  background-image: linear-gradient(
    to right,
    rgba(0, 38, 119, 0.92) 50%,
    rgba(0, 38, 119, 0.6)
  );
  background-size: cover;
  background-position: center;
  padding: 7rem 0;
  color: var(--color-white);
}

.hero-content { max-width: 680px; }

.hero-headline {
  color: var(--color-white);
  margin-bottom: 1.25rem;
}

.hero-subtext {
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  color: rgba(255,255,255,0.9);
}

/* ── PROBLEM BLOCK ── */
.problem-block {
  padding: var(--spacing-section) 0;
  background-color: var(--color-white);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-card-gap);
  margin-bottom: 1.5rem;
}

.stat-card {
  background-color: var(--color-off-white);
  border-top: 4px solid var(--color-orange);
  border-radius: var(--border-radius);
  padding: 1.75rem;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 0.5rem;
}

.stat-description { margin-bottom: 0.75rem; }

.stat-source {
  font-size: 0.8rem;
  color: #888;
  font-style: italic;
}

.section-cta-text { text-align: center; margin-top: 1rem; }

/* ── WHAT WE DO ── */
.what-we-do {
  padding: var(--spacing-section) 0;
  background-color: var(--color-light-blue);
}

.service-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-card-gap);
}

.service-card {
  background-color: var(--color-white);
  border-radius: var(--border-radius);
  padding: 2rem;
  transition: box-shadow var(--transition);
  border-bottom: 3px solid transparent;
}
.service-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  border-bottom-color: var(--color-orange);
}

.service-card img { width: 48px; margin-bottom: 1rem; }
.service-card h3 { color: var(--color-navy); margin-bottom: 0.75rem; }
.service-card p { margin-bottom: 0.75rem; }

.proof-point {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-orange);
  border-left: 3px solid var(--color-orange);
  padding-left: 0.75rem;
}

/* ── RESULTS BAR ── */
.results-bar {
  padding: var(--spacing-section) 0;
  background-color: var(--color-navy);
  color: var(--color-white);
}

.results-bar .section-title { color: var(--color-white); }

.results-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  text-align: center;
}

.result-item { padding: 1rem; }

.result-number {
  display: block;
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-orange);
  margin-bottom: 0.5rem;
}

/* ── CLIENT STORIES ── */
.client-stories {
  padding: var(--spacing-section) 0;
  background-color: var(--color-off-white);
}

.story-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-card-gap);
}

.story-card {
  background-color: var(--color-white);
  border-radius: var(--border-radius);
  padding: 2rem;
  border-top: 4px solid var(--color-navy);
}

.story-icon { font-size: 2rem; display: block; margin-bottom: 0.75rem; }
.story-card h3 { color: var(--color-navy); margin-bottom: 0.75rem; }
.story-card p { margin-bottom: 1rem; }

/* ── THOUGHT LEADERSHIP ── */
.thought-leadership {
  padding: var(--spacing-section) 0;
  background-color: var(--color-white);
}

.linkedin-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-card-gap);
  margin-bottom: 2rem;
}

.linkedin-card {
  background-color: var(--color-off-white);
  border-radius: var(--border-radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.linkedin-quote {
  font-style: italic;
  line-height: 1.7;
  flex: 1;
}

.linkedin-author {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-navy);
}

.advisory-board-card img { margin-bottom: 0.5rem; }

.featured-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #888;
}

.linkedin-follow-cta { text-align: center; }

/* ── FOOTER ── */
.site-footer {
  background-color: var(--color-navy);
  color: rgba(255,255,255,0.8);
  padding: 3rem 0 2rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto;
  gap: 1.5rem 3rem;
  align-items: center;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
}

.footer-nav a {
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--color-orange); }

.footer-contact {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.footer-contact a {
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer-contact a:hover { color: var(--color-orange); }

.footer-legal {
  grid-column: 1 / -1;
  display: flex;
  gap: 2rem;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  margin-top: 0.5rem;
}

.footer-legal a { color: rgba(255,255,255,0.5); }
.footer-legal a:hover { color: var(--color-orange); }


/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .results-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links--open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background-color: var(--color-navy);
    padding: 1rem 1.5rem 1.5rem;
    gap: 1rem;
    z-index: 99;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  }
  .nav-hamburger { display: flex; }
  .site-header { position: relative; }

  .stat-grid,
  .service-card-grid,
  .story-card-grid,
  .linkedin-card-grid { grid-template-columns: 1fr; }

  .results-grid { grid-template-columns: repeat(2, 1fr); }

  .footer-inner { grid-template-columns: 1fr; }
  .footer-nav { flex-direction: column; gap: 0.75rem; }
}

@media (max-width: 480px) {
  .results-grid { grid-template-columns: 1fr; }
  .hero { padding: 4rem 0; }
}

/* ── STICKY NAV ANCHOR OFFSET ── */
/* Accounts for 68px sticky nav; 80px gives 12px breathing room */
#results,
#client-stories,
#client-results,
#revenue-cycle-team {
  scroll-margin-top: 80px;
}