:root {
  --accent: #1d4ed8;
  --accent-dark: #172554;
  --accent-soft: #eff6ff;
  --accent-border: #bfdbfe;
  --accent-glow: rgba(59,130,246,.20);
  --green: #15803d;
  --amber: #f59e0b;
  --slate-950: #0f172a;
  --slate-800: #1e293b;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --white: #fff;
}
body.color-page {
  --accent: #6d28d9;
  --accent-dark: #3b0764;
  --accent-soft: #f5f3ff;
  --accent-border: #ddd6fe;
  --accent-glow: rgba(124,58,237,.20);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--slate-950);
  background: #f8fafc;
  font-family: "Noto Sans Thai", system-ui, sans-serif;
  line-height: 1.65;
}
a { color: inherit; }
img { display: block; max-width: 100%; height: auto; }
.container { width: min(1120px, calc(100% - 2rem)); margin-inline: auto; }
.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: .7rem 1rem;
  border-radius: .6rem;
  color: #fff;
  background: var(--slate-950);
}
.skip-link:focus { top: 1rem; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(226,232,240,.9);
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(12px);
}
.nav-wrap { min-height: 72px; display: flex; align-items: center; gap: 1.5rem; }
.brand { display: inline-flex; align-items: center; gap: .7rem; text-decoration: none; font-weight: 800; }
.brand img { width: 44px; height: 44px; object-fit: contain; }
.brand span span { color: var(--accent); }
.main-nav { margin-left: auto; display: flex; align-items: center; gap: 1.05rem; }
.main-nav a { text-decoration: none; font-weight: 700; font-size: .93rem; }
.main-nav a:hover, .main-nav a:focus-visible { color: var(--accent); }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: .75rem 1.15rem;
  border: 0;
  border-radius: .85rem;
  font: inherit;
  text-decoration: none;
  font-weight: 800;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease;
}
.button-primary { color: #fff; background: var(--accent); }
.button-line { color: #fff; background: var(--green); }
.button-light { color: var(--accent-dark); background: #fff; border: 1px solid var(--slate-200); }
.button:hover { transform: translateY(-2px); box-shadow: 0 10px 25px rgba(15,23,42,.14); }
.hero {
  padding: 4.2rem 0 3rem;
  background:
    radial-gradient(circle at 90% 8%, var(--accent-glow), transparent 35%),
    linear-gradient(135deg, var(--accent-soft), #fff 58%, #fef3c7);
}
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 3rem; align-items: center; }
.eyebrow { margin: 0; color: var(--accent); font-size: .9rem; font-weight: 800; letter-spacing: .04em; }
h1 { margin: .45rem 0 1rem; font-size: clamp(2.1rem, 5vw, 3.8rem); line-height: 1.12; letter-spacing: -.025em; }
.answer-first {
  padding: 1rem 1.1rem;
  border-left: 5px solid var(--accent);
  border-radius: 0 .9rem .9rem 0;
  background: rgba(255,255,255,.88);
  color: var(--slate-700);
  font-size: 1.05rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.4rem; }
.pills { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.1rem; }
.pill {
  padding: .38rem .68rem;
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  color: var(--accent-dark);
  background: var(--accent-soft);
  font-size: .84rem;
  font-weight: 700;
}
.hero-product {
  display: grid;
  place-items: center;
  min-height: 430px;
  margin: 0;
  padding: 1.5rem;
  border: 8px solid rgba(255,255,255,.85);
  border-radius: 1.4rem;
  background: rgba(255,255,255,.78);
  box-shadow: 0 24px 55px rgba(15,23,42,.14);
}
.hero-product img { max-height: 390px; width: auto; object-fit: contain; }
.section { padding: 4rem 0; }
.section-alt { background: var(--accent-soft); }
.section h2 { margin: 0 0 .75rem; font-size: clamp(1.65rem, 3vw, 2.35rem); line-height: 1.25; }
.section-lead { max-width: 790px; margin: 0 0 2rem; color: var(--slate-600); }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.card {
  padding: 1.3rem;
  border: 1px solid var(--slate-200);
  border-radius: 1rem;
  background: #fff;
  box-shadow: 0 8px 24px rgba(15,23,42,.05);
}
.card h3 { margin: 0 0 .4rem; font-size: 1.12rem; }
.card p { margin: 0; color: var(--slate-600); }
.table-wrap { overflow-x: auto; border: 1px solid var(--slate-200); border-radius: 1rem; background: #fff; }
table { width: 100%; min-width: 720px; border-collapse: collapse; }
th, td { padding: .9rem 1rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--slate-200); }
th { color: #fff; background: var(--accent-dark); }
tr:last-child td { border-bottom: 0; }
.model-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.model {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--slate-200);
  border-radius: 1.1rem;
  background: #fff;
  box-shadow: 0 10px 28px rgba(15,23,42,.06);
}
.model-media { display: grid; place-items: center; min-height: 260px; padding: 1rem; background: linear-gradient(145deg, #fff, var(--accent-soft)); }
.model-media img { max-height: 230px; width: auto; object-fit: contain; }
.model-body { display: flex; flex: 1; flex-direction: column; padding: 1.2rem; }
.model-body h3 { margin: 0 0 .35rem; font-size: 1.15rem; }
.model-body p { margin: 0 0 1rem; color: var(--slate-600); }
.model-body .button { margin-top: auto; }
.case-grid { display: grid; gap: 1rem; }
.case-study {
  scroll-margin-top: 92px;
  padding: 1.35rem;
  border: 1px solid var(--slate-200);
  border-radius: 1rem;
  background: #fff;
  box-shadow: 0 8px 24px rgba(15,23,42,.05);
}
.case-heading { display: flex; gap: 1rem; align-items: flex-start; margin-bottom: 1rem; }
.case-heading h3 { margin: .15rem 0 0; font-size: 1.25rem; }
.case-number {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 2.7rem;
  height: 2.7rem;
  border-radius: .8rem;
  color: #fff;
  background: var(--accent);
  font-weight: 800;
}
.case-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem; margin: 0; }
.case-facts div { padding: 1rem; border-radius: .8rem; background: var(--slate-100); }
.case-facts dt { color: var(--accent-dark); font-weight: 800; }
.case-facts dd { margin: .25rem 0 0; color: var(--slate-700); }
.case-facts a, .source-note a { color: var(--accent); }
.evidence-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.evidence { overflow: hidden; margin: 0; border-radius: 1rem; background: #fff; box-shadow: 0 8px 24px rgba(15,23,42,.08); }
.evidence img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.evidence figcaption { padding: .85rem 1rem; color: var(--slate-700); font-size: .9rem; }
.source-note { margin: 1.25rem 0 0; color: var(--slate-600); }
.case-actions { justify-content: center; }
.steps { counter-reset: steps; display: grid; gap: .8rem; padding: 0; list-style: none; }
.steps li {
  position: relative;
  padding: 1rem 1rem 1rem 4rem;
  border: 1px solid var(--slate-200);
  border-radius: 1rem;
  background: #fff;
}
.steps li::before {
  counter-increment: steps;
  content: counter(steps);
  position: absolute;
  left: 1rem;
  top: 1rem;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  color: #fff;
  background: var(--accent);
  font-weight: 800;
}
blockquote {
  margin: 1.5rem 0 0;
  padding: 1.2rem 1.4rem;
  border-radius: 1rem;
  color: var(--accent-dark);
  background: #fef3c7;
  font-size: 1.05rem;
  font-weight: 700;
}
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.choice {
  padding: 1.4rem;
  border: 1px solid var(--slate-200);
  border-radius: 1rem;
  background: #fff;
}
.choice.current { border: 3px solid var(--accent); }
.choice h3 { margin-top: 0; }
.faq { display: grid; gap: .75rem; }
details { border: 1px solid var(--slate-200); border-radius: .9rem; background: #fff; }
summary { cursor: pointer; padding: 1rem 1.1rem; font-weight: 800; }
details p { margin: 0; padding: 0 1.1rem 1.1rem; color: var(--slate-700); }
.author {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: center;
  padding: 1.25rem;
  border: 1px solid var(--accent-border);
  border-radius: 1rem;
  background: var(--accent-soft);
}
.author-mark { display: grid; place-items: center; width: 64px; height: 64px; border-radius: 50%; color: #fff; background: var(--accent); font-size: 1.35rem; font-weight: 800; }
.author p { margin: .15rem 0; color: var(--slate-700); }
.cta-band { padding: 2.2rem; border-radius: 1.25rem; text-align: center; color: #fff; background: var(--accent-dark); }
.cta-band h2 { color: #fff; }
.cta-band p { color: #e2e8f0; }
footer { margin-top: 4rem; padding: 2.4rem 0 6rem; color: #cbd5e1; background: var(--slate-950); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem; }
footer h2 { margin-top: 0; color: #fff; font-size: 1.05rem; }
footer a { color: #e2e8f0; }
footer ul { margin: 0; padding: 0; list-style: none; }
footer li + li { margin-top: .4rem; }
.mobile-bar {
  position: fixed;
  z-index: 60;
  left: .7rem;
  right: .7rem;
  bottom: .7rem;
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: .5rem;
  padding: .5rem;
  border: 1px solid var(--slate-200);
  border-radius: 1rem;
  background: rgba(255,255,255,.95);
  box-shadow: 0 12px 35px rgba(15,23,42,.2);
}
.mobile-bar a { min-height: 44px; }
:focus-visible { outline: 3px solid var(--amber); outline-offset: 3px; }
@media (max-width: 850px) {
  .main-nav a:not(.button) { display: none; }
  .hero { padding-top: 2.8rem; }
  .hero-grid, .split { grid-template-columns: 1fr; }
  .cards, .model-grid, .case-facts, .evidence-grid { grid-template-columns: 1fr; }
  .hero-product { min-height: 340px; }
  .footer-grid { grid-template-columns: 1fr; }
  .mobile-bar { display: grid; }
}
@media (max-width: 520px) {
  .container { width: min(100% - 1.2rem, 1120px); }
  .brand span { font-size: .92rem; }
  .main-nav .button { display: none; }
  .hero-actions .button { width: 100%; }
  .section { padding: 3rem 0; }
  .cta-band { padding: 1.35rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}