:root {
  --ink: #142d27;
  --muted: #53675f;
  --green: #0d6d58;
  --forest: #0d463b;
  --mint: #dff6ed;
  --cream: #fbf8f1;
  --line: #d7e4df;
  --paper: #ffffff;
  --max: 860px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: linear-gradient(180deg, #f4faf7, var(--cream)); color: var(--ink); font: 17px/1.75 "Noto Sans Thai", Inter, system-ui, sans-serif; }
a { color: var(--green); }
a:focus-visible { outline: 3px solid #f1a46f; outline-offset: 4px; }
.skip-link { position: absolute; left: 12px; top: -80px; z-index: 20; padding: 10px 14px; border-radius: 10px; background: #fff; color: var(--forest); }
.skip-link:focus { top: 12px; }
.wrap { width: min(var(--max), calc(100% - 32px)); margin-inline: auto; }
.top { border-bottom: 1px solid var(--line); background: rgba(255,255,255,.95); }
.top .wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--forest); font-size: 21px; font-weight: 900; text-decoration: none; }
.brand img { border-radius: 12px; }
.nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px 16px; }
.nav a { color: var(--forest); font-size: 14px; font-weight: 800; text-decoration: none; }
.article { margin: 38px auto 70px; padding: clamp(25px, 6vw, 56px); border: 1px solid var(--line); border-radius: 28px; background: var(--paper); box-shadow: 0 20px 55px rgba(13,70,59,.09); }
.eyebrow { margin: 0 0 8px; color: var(--green); font-weight: 900; }
h1 { margin: 0 0 18px; font-size: clamp(36px, 6vw, 58px); line-height: 1.14; letter-spacing: -.035em; }
h2 { margin: 38px 0 10px; font-size: clamp(24px, 4vw, 31px); line-height: 1.3; }
h3 { margin: 25px 0 8px; }
p, li { color: var(--muted); }
.lead { font-size: 20px; }
ul, ol { padding-left: 24px; }
li { margin: 8px 0; }
.summary, .notice, .formula, .step, .contact-card { margin: 22px 0; padding: 20px 22px; border: 1px solid var(--line); border-radius: 18px; background: #f7fbf9; }
.summary { border-color: #a9d7c6; background: var(--mint); }
.notice { border-left: 4px solid #e78d62; background: #fff4ec; }
.formula { overflow-wrap: anywhere; color: var(--forest); font-weight: 800; }
.steps { display: grid; gap: 14px; margin: 24px 0; }
.step { margin: 0; }
.step strong { color: var(--forest); }
.checklist { list-style: none; padding: 0; }
.checklist li { position: relative; padding-left: 30px; }
.checklist li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 900; }
.cta { margin-top: 38px; padding: 28px; border-radius: 22px; background: linear-gradient(135deg, var(--forest), #0d765e); color: white; }
.cta h2 { margin-top: 0; color: white; }
.cta p { color: #dceee7; }
.button { display: inline-flex; margin: 8px 8px 0 0; padding: 11px 17px; border-radius: 999px; background: white; color: var(--forest); font-weight: 900; text-decoration: none; }
.button-secondary { border: 1px solid #8ac3ad; background: transparent; color: white; }
.store-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.store-links a { display: inline-flex; padding: 12px 18px; border-radius: 14px; background: #111917; color: white; font-weight: 800; text-decoration: none; }
footer { padding: 30px 0; background: #102d27; color: #dce8e4; font-size: 14px; }
footer a { color: white; text-underline-offset: 3px; }
@media (max-width: 600px) {
  body { font-size: 16px; }
  .top .wrap { align-items: flex-start; flex-direction: column; padding-block: 14px; }
  .nav { justify-content: flex-start; }
  .article { margin-top: 22px; border-radius: 22px; }
  h1 { font-size: 38px; }
  .lead { font-size: 18px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }