/* Opcelerate Neural — premium blog article layout
   Matches product landings + reviews (warm paper, Fraunces, green/gold) */
:root {
  --bg: #f4efe6;
  --bg-deep: #ebe4d8;
  --ink: #14110d;
  --muted: #5c554c;
  --line: rgba(20, 17, 13, 0.1);
  --card: #fffcf7;
  --green: #1f5c48;
  --green-2: #2f6f56;
  --gold: #d97706;
  --shadow: 0 24px 60px rgba(20, 17, 13, 0.08);
  --radius: 22px;
  --font: "DM Sans", system-ui, -apple-system, sans-serif;
  --display: "Fraunces", Georgia, serif;
  --max: 1120px;
  --prose: 720px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --safe-b: env(safe-area-inset-bottom, 0px);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 8% -8%, rgba(47, 111, 86, 0.14), transparent 55%),
    radial-gradient(700px 360px at 100% 0%, rgba(217, 119, 6, 0.1), transparent 50%),
    var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.wrap { width: min(var(--max), calc(100% - 2rem)); margin: 0 auto; }
.prose-wrap { width: min(var(--prose), calc(100% - 2rem)); margin: 0 auto; }

/* Nav */
.topnav {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: blur(16px) saturate(1.15);
  background: rgba(244, 239, 230, 0.88);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, box-shadow .25s;
}
.topnav.scrolled {
  border-color: var(--line);
  box-shadow: 0 10px 30px rgba(20, 17, 13, 0.06);
}
.topnav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .9rem 0;
}
.brand {
  display: inline-flex; align-items: center; gap: .55rem;
  font-family: var(--display); font-weight: 700; font-size: 1.05rem;
  letter-spacing: -0.02em;
}
.brand img { border-radius: 8px; }
.nav-links {
  display: flex; flex-wrap: wrap; gap: .35rem 1.1rem;
  font-size: .88rem; font-weight: 600; color: var(--muted);
}
.nav-links a:hover { color: var(--green); }
.nav-cta {
  display: inline-flex; align-items: center; min-height: 42px; padding: 0 1.05rem;
  border-radius: 999px; background: var(--ink); color: #fff;
  font-size: .82rem; font-weight: 700;
}
.nav-cta:hover { background: var(--green); }

/* Hero */
.hero { padding: 2rem 0 1.25rem; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.25rem;
  align-items: center;
}
.crumb {
  font-size: .8rem; color: var(--muted); margin-bottom: .9rem;
  display: flex; flex-wrap: wrap; gap: .35rem; align-items: center;
}
.crumb a { color: var(--green-2); font-weight: 600; }
.crumb a:hover { text-decoration: underline; text-underline-offset: 3px; }
.tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .9rem; }
.tag {
  font-size: .68rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase;
  padding: .38rem .7rem; border-radius: 999px;
  background: rgba(47, 111, 86, 0.12); color: var(--green);
  border: 1px solid rgba(47, 111, 86, 0.16);
}
h1 {
  font-family: var(--display);
  font-size: clamp(2.1rem, 4.8vw, 3.2rem);
  line-height: 1.08; letter-spacing: -0.03em;
  margin-bottom: 1rem;
}
.lede {
  font-size: 1.08rem; color: var(--muted); max-width: 36rem; margin-bottom: 1.25rem;
}
.meta-row {
  display: flex; flex-wrap: wrap; gap: .5rem 1.1rem;
  font-size: .86rem; color: var(--muted); font-weight: 500; margin-bottom: 1.35rem;
}
.meta-row span { display: inline-flex; align-items: center; gap: .35rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .65rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 1.25rem; border-radius: 999px;
  font-size: .9rem; font-weight: 700; border: 0; cursor: pointer;
  font-family: inherit; transition: transform .2s var(--ease), box-shadow .2s, background .2s;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--green); color: #fffaf0;
  box-shadow: 0 12px 28px rgba(31, 92, 72, 0.22);
}
.btn-primary:hover { background: var(--green-2); }
.btn-gold {
  background: linear-gradient(135deg, #e8a317, var(--gold));
  color: #1a1208; box-shadow: 0 12px 28px rgba(217, 119, 6, 0.22);
}
.btn-ghost {
  background: rgba(255,252,247,.75); color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
}
.btn-ghost:hover { background: #fff; }

.hero-media {
  position: relative;
  border-radius: calc(var(--radius) + 6px);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow:
    0 28px 70px rgba(20, 17, 13, 0.14),
    0 2px 0 rgba(255, 252, 247, 0.6) inset;
  background:
    linear-gradient(145deg, #d8cfc0, #ebe4d8);
  aspect-ratio: 4 / 3;
  isolation: isolate;
}
.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, transparent 48%, rgba(20, 17, 13, 0.28) 100%),
    linear-gradient(90deg, rgba(20, 17, 13, 0.08) 0%, transparent 28%),
    radial-gradient(120% 80% at 70% 20%, transparent 40%, rgba(20, 17, 13, 0.12) 100%);
  z-index: 1;
}
.hero-media img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: 52% 42%;
  transform: scale(1.02);
  transition: transform .8s var(--ease);
}
.hero-media:hover img { transform: scale(1.05); }
.float-chip {
  position: absolute;
  z-index: 2;
  background: rgba(255, 252, 247, 0.94);
  backdrop-filter: blur(12px) saturate(1.1);
  border: 1px solid rgba(255, 252, 247, 0.7);
  border-radius: 16px;
  padding: .7rem .95rem;
  font-size: .78rem; font-weight: 700;
  box-shadow: 0 14px 34px rgba(20, 17, 13, 0.16);
  line-height: 1.25;
  color: var(--ink);
}
.float-chip small {
  display: block; font-weight: 500; color: var(--muted); font-size: .72rem; margin-top: .18rem;
}
.float-chip.a { left: 1.05rem; bottom: 1.05rem; }
.float-chip.b {
  right: 1.05rem; top: 1.05rem;
  background: rgba(31, 92, 72, 0.92);
  color: #fffaf0;
  border-color: rgba(255, 250, 240, 0.15);
}
.float-chip.b small { color: rgba(255, 250, 240, 0.78); }

/* Sections */
.section { padding: 2rem 0; }
.section.tint {
  background: rgba(255, 252, 247, 0.45);
  border-block: 1px solid var(--line);
}
.section-head { margin-bottom: 1.25rem; }
.kicker {
  font-size: .72rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase;
  color: var(--green); margin-bottom: .45rem;
}
.section-head h2, .prose h2 {
  font-family: var(--display);
  font-size: clamp(1.55rem, 3vw, 2.1rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

/* Answer + fact cards */
.answer {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--green);
  border-radius: 16px;
  padding: 1.25rem 1.35rem;
  box-shadow: 0 10px 30px rgba(20,17,13,.04);
  margin: 0 0 1.5rem;
}
.answer strong { color: var(--green); }
.answer p + p { margin-top: .75rem; }
.answer a {
  color: var(--green-2); font-weight: 700;
  text-decoration: underline; text-underline-offset: 3px;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .85rem;
  margin: 1.5rem 0 0;
}
.fact-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.15rem 1.1rem;
  transition: transform .25s var(--ease), box-shadow .25s, border-color .25s;
}
.fact-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: rgba(31, 92, 72, 0.22);
}
.fact-card strong {
  display: block;
  font-family: var(--display);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--green);
  margin-bottom: .35rem;
}
.fact-card span { display: block; color: var(--muted); font-size: .9rem; line-height: 1.5; }

/* Prose */
.prose { padding: 0.5rem 0 1rem; }
.prose p { margin: 0 0 1.15rem; color: var(--ink); font-size: 1.02rem; }
.prose p.muted { color: var(--muted); }
.prose a {
  color: var(--green-2); font-weight: 600;
  text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px;
}
.prose h2 { margin: 2.25rem 0 1rem; }
.prose ul, .prose ol { margin: 0 0 1.35rem 1.2rem; color: var(--muted); }
.prose li { margin: .4rem 0; padding-left: .25rem; }
.prose li strong { color: var(--ink); }

/* Comparison table */
.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0 1.75rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: 0 10px 30px rgba(20,17,13,.04);
}
.compare {
  width: 100%; border-collapse: collapse; min-width: 560px;
}
.compare th, .compare td {
  padding: 1rem 1.1rem; text-align: left; vertical-align: top;
  border-bottom: 1px solid var(--line); font-size: .94rem;
}
.compare th {
  font-size: .72rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase;
  color: var(--muted); background: rgba(20,17,13,.03);
}
.compare tr:last-child td { border-bottom: 0; }
.compare td:first-child { font-weight: 700; color: var(--ink); width: 32%; }
.compare .best { color: var(--green); font-weight: 700; }

/* Curriculum steps */
.steps {
  display: grid; gap: .75rem; margin: 1.25rem 0 1.75rem; list-style: none; padding: 0;
}
.steps li {
  display: grid; grid-template-columns: 48px 1fr; gap: 1rem; align-items: start;
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 1rem 1.15rem;
}
.steps .num {
  width: 48px; height: 48px; border-radius: 14px;
  display: grid; place-items: center;
  background: rgba(47, 111, 86, 0.12); color: var(--green);
  font-family: var(--display); font-size: 1.15rem; font-weight: 700;
}
.steps .step-body { padding-top: .2rem; }
.steps .step-body strong { display: block; color: var(--ink); margin-bottom: .15rem; }
.steps .step-body span { color: var(--muted); font-size: .92rem; }

/* Location cards */
.loc-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: .85rem;
  margin: 1.25rem 0 1.75rem;
}
.loc-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 1.2rem 1.25rem;
}
.loc-card h3 {
  font-family: var(--display); font-size: 1.2rem; letter-spacing: -0.02em;
  margin-bottom: .4rem; color: var(--ink);
}
.loc-card p { color: var(--muted); font-size: .92rem; margin: 0; }

/* FAQ */
.faq { display: grid; gap: .65rem; margin: 1.25rem 0 1.5rem; }
.faq details {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 1rem 1.15rem; transition: border-color .2s;
}
.faq details[open] { border-color: rgba(31, 92, 72, 0.25); }
.faq summary {
  cursor: pointer; font-weight: 700; list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.2rem; color: var(--green); font-weight: 500; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin-top: .65rem; color: var(--muted); font-size: .95rem; padding-right: 1.5rem; }

/* CTA band */
.cta-band {
  background: linear-gradient(145deg, #1a3d32 0%, var(--green) 55%, #2f6f56 100%);
  color: #fffaf0;
  border-radius: calc(var(--radius) + 4px);
  padding: clamp(1.5rem, 4vw, 2.25rem);
  margin: 2rem 0;
  box-shadow: 0 24px 50px rgba(31, 92, 72, 0.25);
}
.cta-band h2 {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.02em;
  margin-bottom: .6rem;
  color: #fff;
}
.cta-band p { color: rgba(255,250,240,.88); max-width: 36rem; margin-bottom: 1.25rem; }
.cta-band .hero-actions .btn-primary {
  background: #fffaf0; color: var(--green);
  box-shadow: 0 10px 24px rgba(0,0,0,.12);
}
.cta-band .hero-actions .btn-ghost {
  background: transparent; color: #fffaf0;
  box-shadow: inset 0 0 0 1.5px rgba(255,250,240,.35);
}
.cta-band .hero-actions .btn-ghost:hover { background: rgba(255,250,240,.1); }

/* Related */
.related-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: .9rem;
}
.related-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 1.2rem 1.25rem; display: flex; flex-direction: column; gap: .55rem;
  transition: transform .25s var(--ease), box-shadow .25s, border-color .25s;
  height: 100%;
}
.related-card:hover {
  transform: translateY(-3px); box-shadow: var(--shadow);
  border-color: rgba(31, 92, 72, 0.22);
}
.related-card .tag { align-self: flex-start; }
.related-card h3 {
  font-family: var(--display); font-size: 1.2rem; letter-spacing: -0.02em; line-height: 1.2;
  flex: 1;
}
.related-card .read {
  font-size: .82rem; font-weight: 700; color: var(--green);
}

.link-list {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: .55rem .9rem;
  list-style: none; padding: 0; margin: 1rem 0 0;
}
.link-list a {
  display: block; background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: .85rem 1rem; font-weight: 600; font-size: .92rem;
  transition: border-color .2s, transform .2s;
}
.link-list a:hover {
  border-color: rgba(31, 92, 72, 0.3); transform: translateY(-1px);
  text-decoration: none;
}

/* Footer */
.site-foot {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 calc(1.5rem + var(--safe-b));
  color: var(--muted); font-size: .85rem;
  background: rgba(255,252,247,.5); margin-top: 1rem;
}
.foot-inner {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; align-items: center;
}
.site-foot a { color: var(--muted); font-weight: 600; }
.site-foot a:hover { color: var(--green); }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .nav-links { display: none; }
  .fact-grid { grid-template-columns: repeat(2, 1fr); }
  .loc-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .link-list { grid-template-columns: 1fr; }
  .hero-media { aspect-ratio: 16 / 11; max-height: min(52vh, 420px); }
  .hero-media img { object-position: 50% 40%; }
}
@media (max-width: 560px) {
  .fact-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 1.4rem; }
  .steps li { grid-template-columns: 40px 1fr; }
  .steps .num { width: 40px; height: 40px; font-size: 1rem; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; scroll-behavior: auto !important; }
}