/* ==========================================================================
   A1C Levels — site-wide stylesheet
   Editorial health publication aesthetic
   ========================================================================== */

:root {
  --ink: #1d2025;
  --ink-soft: #4a5058;
  --paper: #fbf8f3;
  --paper-warm: #f3ede2;
  --accent: #8b2c3d;
  --accent-soft: #c77a85;
  --rule: #ddd4c2;
  --highlight: #e8dfc8;
  --good: #3d6b4a;
  --warn: #b8743b;
  --alert: #8b2c3d;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
}

.wrap { max-width: 980px; margin: 0 auto; padding: 0 1.5rem; }
.wrap-narrow { max-width: 720px; margin: 0 auto; padding: 0 1.5rem; }

/* ---------- Masthead ---------- */
.masthead {
  border-bottom: 2px solid var(--ink);
  padding: 1.25rem 0 1rem;
  background: var(--paper);
}
.masthead-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.logo {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 700;
  font-size: 1.75rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}
.logo em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
}
.tagline {
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ---------- Nav ---------- */
nav.main {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
}
nav.main ul {
  list-style: none;
  margin: 0;
  padding: 0.75rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
}
nav.main a {
  text-decoration: none;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
nav.main a:hover { color: var(--accent); border-bottom-color: var(--accent); }
nav.main a.current { color: var(--accent); border-bottom-color: var(--accent); }
nav.main a.new::after {
  content: 'New';
  display: inline-block;
  margin-left: 0.35rem;
  font-size: 0.65rem;
  font-weight: 600;
  background: var(--accent);
  color: var(--paper);
  padding: 0.1rem 0.4rem;
  border-radius: 2px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  vertical-align: middle;
}

/* ---------- Page header (for interior pages) ---------- */
.page-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(ellipse at top right, rgba(199, 122, 133, 0.06), transparent 60%),
    var(--paper);
}
.page-header .kicker {
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.page-header h1 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 400;
  font-size: clamp(2rem, 4.5vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}
.page-header h1 em { font-style: italic; color: var(--accent); }
.page-header .subtitle {
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin: 0;
  max-width: 56ch;
}

/* ---------- Hero (homepage only) ---------- */
.hero {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(ellipse at top right, rgba(199, 122, 133, 0.08), transparent 60%),
    var(--paper);
}
.hero .kicker {
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 1rem;
}
.hero h1 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 400;
  font-size: clamp(2rem, 5.5vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
  max-width: 18ch;
}
.hero h1 em { font-style: italic; color: var(--accent); }
.hero .lede {
  font-size: 1.2rem;
  color: var(--ink-soft);
  max-width: 56ch;
  margin: 0 0 1.75rem;
}
.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.7rem 1.3rem;
  border-radius: 2px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.12s, box-shadow 0.12s;
  border: 2px solid var(--ink);
  cursor: pointer;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 4px 4px 0 var(--accent); }
.btn-secondary { background: transparent; color: var(--ink); }
.btn-secondary:hover { background: var(--ink); color: var(--paper); }

/* ---------- Sections & headings ---------- */
section { padding: 3rem 0; border-bottom: 1px solid var(--rule); }
section:last-of-type { border-bottom: none; }

.section-label {
  font-family: 'Fraunces', Georgia, serif;
  font-style: italic;
  font-size: 0.95rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

h2 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 600;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 1.25rem;
}

h3 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 600;
  font-size: 1.25rem;
  margin: 1.75rem 0 0.5rem;
}

h4 {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}

p { margin: 0 0 1rem; }

/* ---------- Article prose (for content pages) ---------- */
.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.prose a:hover { text-decoration-thickness: 2px; }
.prose ul, .prose ol { margin: 0 0 1.25rem; padding-left: 1.4rem; }
.prose ul li, .prose ol li { margin-bottom: 0.4rem; }
.prose blockquote {
  border-left: 3px solid var(--accent);
  margin: 1.5rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  color: var(--ink-soft);
  font-style: italic;
}

/* ---------- Tip / callout box ---------- */
.callout {
  background: var(--paper-warm);
  border-radius: 4px;
  padding: 1.5rem 1.75rem;
  margin: 1.75rem 0;
}
.callout h3 { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }

.callout-accent {
  border-left: 4px solid var(--accent);
  background: rgba(199, 122, 133, 0.08);
}

/* ---------- Two-column layout ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}
.two-col > div > *:first-child { margin-top: 0; }

/* ---------- A1C ranges (homepage centerpiece) ---------- */
.ranges {
  background: var(--paper-warm);
  padding: 2rem;
  border-radius: 4px;
  margin: 1.5rem 0;
}
.range-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.range-card {
  background: var(--paper);
  padding: 1.25rem;
  border-left: 4px solid var(--rule);
  border-radius: 2px;
}
.range-card.normal { border-left-color: var(--good); }
.range-card.pre { border-left-color: var(--warn); }
.range-card.diabetes { border-left-color: var(--alert); }
.range-value {
  font-family: 'Fraunces', Georgia, serif;
  font-size: 1.6rem;
  font-weight: 700;
  display: block;
  line-height: 1;
  margin-bottom: 0.35rem;
}
.range-label {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 600;
}
.range-card p { margin: 0.6rem 0 0; font-size: 0.92rem; color: var(--ink-soft); }

/* ---------- Featured dark card ---------- */
.featured {
  background: var(--ink);
  color: var(--paper);
  padding: 2.5rem;
  border-radius: 4px;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.featured::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  opacity: 0.35;
  pointer-events: none;
}
.featured > * { position: relative; }
.featured .kicker {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-soft);
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.featured h2 { color: var(--paper); margin-bottom: 0.75rem; }
.featured p { margin: 0 0 1.25rem; color: rgba(251, 248, 243, 0.85); }
.featured .btn-primary { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.featured .btn-primary:hover { box-shadow: 4px 4px 0 var(--accent-soft); }
.featured-stat {
  text-align: center;
  padding: 1.5rem;
  border: 1px solid rgba(251, 248, 243, 0.2);
  border-radius: 4px;
}
.featured-stat .num {
  font-family: 'Fraunces', Georgia, serif;
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent-soft);
  display: block;
  margin-bottom: 0.5rem;
}
.featured-stat .desc { font-size: 0.85rem; color: rgba(251, 248, 243, 0.7); }

/* ---------- Topic grid ---------- */
.topics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.topic {
  display: block;
  padding: 1.5rem;
  background: var(--paper);
  border: 1px solid var(--rule);
  text-decoration: none;
  color: var(--ink);
  border-radius: 2px;
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
}
.topic:hover {
  transform: translateY(-2px);
  border-color: var(--ink);
  box-shadow: 4px 4px 0 var(--highlight);
}
.topic .num {
  font-family: 'Fraunces', Georgia, serif;
  font-style: italic;
  font-size: 0.9rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.4rem;
}
.topic h3 { margin: 0 0 0.4rem; }
.topic p { margin: 0; font-size: 0.93rem; color: var(--ink-soft); }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; margin: 1rem 0 1.5rem; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
th, td {
  border: 1px solid var(--rule);
  padding: 0.6rem 0.75rem;
  text-align: left;
  vertical-align: top;
}
th { background: var(--paper-warm); font-weight: 600; }

/* ---------- FAQ (details/summary) ---------- */
details {
  border-bottom: 1px solid var(--rule);
  padding: 1rem 0;
}
details summary {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 600;
  font-size: 1.1rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
details summary::-webkit-details-marker { display: none; }
details summary::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--accent);
  transition: transform 0.2s;
  flex-shrink: 0;
}
details[open] summary::after { content: '−'; }
details p { margin: 0.75rem 0 0; color: var(--ink-soft); }

/* ---------- Disclaimer boxes ---------- */
.disclaimer {
  background: var(--highlight);
  padding: 1rem 1.25rem;
  border-radius: 2px;
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 2rem 0 1rem;
}
.disclaimer strong { color: var(--ink); }

/* ---------- References list ---------- */
.references ol { list-style: none; counter-reset: ref; padding: 0; }
.references li {
  counter-increment: ref;
  padding: 0.75rem 0 0.75rem 2.5rem;
  position: relative;
  border-bottom: 1px solid var(--rule);
  font-size: 0.93rem;
  color: var(--ink-soft);
}
.references li::before {
  content: counter(ref);
  position: absolute;
  left: 0;
  top: 0.85rem;
  font-family: 'Fraunces', Georgia, serif;
  font-style: italic;
  color: var(--accent);
  font-size: 0.95rem;
  width: 2rem;
  text-align: right;
  padding-right: 0.5rem;
}
.references a { color: var(--accent); }

/* ---------- Footer ---------- */
footer {
  background: var(--ink);
  color: rgba(251, 248, 243, 0.7);
  padding: 2.5rem 0 1.5rem;
  font-size: 0.9rem;
}
footer a { color: var(--paper); text-decoration: none; }
footer a:hover { color: var(--accent-soft); }
.foot-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}
.foot-cols h4 {
  color: var(--paper);
  font-family: 'Fraunces', Georgia, serif;
  font-size: 1rem;
  text-transform: none;
  letter-spacing: 0;
  margin: 0 0 0.75rem;
}
.foot-cols ul { list-style: none; padding: 0; margin: 0; }
.foot-cols li { margin-bottom: 0.4rem; }
.foot-bottom {
  border-top: 1px solid rgba(251, 248, 243, 0.15);
  padding-top: 1.25rem;
  text-align: center;
  font-size: 0.83rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .featured { grid-template-columns: 1fr; padding: 2rem 1.5rem; }
  .two-col { grid-template-columns: 1fr; gap: 1.5rem; }
  .ranges { padding: 1.5rem 1rem; }
  .hero { padding: 2.5rem 0 2rem; }
  .page-header { padding: 2rem 0 1.5rem; }
  section { padding: 2.5rem 0; }
}

/* Subtle entrance animation */
@media (prefers-reduced-motion: no-preference) {
  .hero .kicker, .hero h1, .hero .lede, .hero-ctas,
  .page-header .kicker, .page-header h1, .page-header .subtitle {
    opacity: 0;
    animation: rise 0.6s ease-out forwards;
  }
  .hero h1, .page-header h1 { animation-delay: 0.1s; }
  .hero .lede, .page-header .subtitle { animation-delay: 0.2s; }
  .hero-ctas { animation-delay: 0.3s; }
}
@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}