:root {
  --bg: #fbf8f3;
  --card: #ffffff;
  --ink: #1f1b16;
  --muted: #625a50;
  --line: #e9e1d4;
  --accent: #c2410c;
  --accent-ink: #ffffff;
  --soft: #fff1e6;
  --code-bg: #1f1b16;
  --code-ink: #f6eee3;
  font-family: "IBM Plex Sans Thai", system-ui, sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-size: 16px; line-height: 1.7; }
a { color: var(--accent); }
code { font: 14px "JetBrains Mono", monospace; background: var(--soft); padding: 1px 6px; border-radius: 5px; }
pre code { background: none; padding: 0; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }

.hero { background: var(--ink); color: #fff; padding: 48px 0 36px; }
.kicker { margin: 0; color: #f2c9a8; font-size: 14px; font-weight: 500; }
.hero h1 { font-size: clamp(38px, 7vw, 64px); line-height: 1.12; margin: 10px 0 12px; }
.hero .sub { margin: 0; max-width: 46ch; color: #e7ddd0; font-size: 18px; }
.cta { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.btn { display: inline-block; text-decoration: none; font-weight: 600; border-radius: 999px; padding: 10px 20px; border: 1px solid #ffffff55; color: #fff; }
.btn.primary { background: var(--accent); border-color: var(--accent); }
.toc { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 26px; font-size: 14px; }
.toc a { color: #e7ddd0; text-decoration: none; border-bottom: 1px dashed #e7ddd066; }

main { padding-top: 12px; }
section { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 24px 26px; margin: 20px 0; }
h2 { display: flex; align-items: center; gap: 12px; font-size: 24px; margin: 0 0 6px; }
h2 span { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--accent); color: var(--accent-ink); font-size: 18px; flex: none; }
.lead { color: var(--muted); margin: 0 0 16px; }
h3 { font-size: 17px; margin: 0 0 6px; }

.tools { width: 100%; border-collapse: collapse; font-size: 15px; }
.tools th, .tools td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tools th { font-size: 13px; color: var(--muted); font-weight: 600; }
.cmds { margin-top: 16px; }
.cmds > p { margin: 14px 0 6px; }
.cmd { position: relative; background: var(--code-bg); color: var(--code-ink); border-radius: 12px; padding: 10px 14px; margin: 6px 0; }
.cmd span { display: block; font-size: 12px; color: #c9b9a6; }
.cmd pre { margin: 2px 90px 0 0; white-space: pre-wrap; word-break: break-all; }
.cmd code { color: var(--code-ink); font-size: 15px; }
.copy { font: 600 13px "IBM Plex Sans Thai", sans-serif; border: 1px solid var(--line); background: var(--card); color: var(--ink); border-radius: 8px; padding: 4px 10px; cursor: pointer; }
.cmd .copy { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); }

.rules { margin: 6px 0 0; padding-left: 1.4em; display: grid; gap: 10px; }
.rules b { display: block; }

.prompts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.prompts article { position: relative; border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px 46px; background: #fffdf9; }
.prompts .p { margin: 0; font-size: 15px; }
.prompts .copy { position: absolute; right: 12px; bottom: 12px; }

.steps { list-style: none; counter-reset: s; padding: 0; margin: 0; display: grid; gap: 18px; }
.steps > li { counter-increment: s; display: grid; grid-template-columns: 1fr 1.25fr; gap: 18px; align-items: start; border-top: 1px solid var(--line); padding-top: 18px; }
.steps > li:first-child { border-top: 0; padding-top: 4px; }
.steps h3::before { content: "ขั้นที่ " counter(s) " · "; color: var(--accent); }
.steps p { margin: 0 0 8px; font-size: 15px; }
.steps .chk { color: var(--muted); font-size: 14px; background: var(--soft); border-radius: 10px; padding: 8px 10px; }
.steps img { display: block; width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--line); }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.pair figure { margin: 0; }
.pair figcaption { text-align: center; font-size: 13px; color: var(--muted); }
.code { background: var(--code-bg); color: var(--code-ink); border-radius: 12px; padding: 14px 16px; margin: 0; overflow-x: auto; }
.code code { color: var(--code-ink); }

.checklist { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 20px; }
.checklist li { position: relative; padding-left: 30px; }
.checklist li::before { content: ""; position: absolute; left: 0; top: 5px; width: 18px; height: 18px; border: 2px solid var(--accent); border-radius: 5px; }

.faq { margin: 0; display: grid; grid-template-columns: minmax(180px, 1fr) 2fr; gap: 10px 20px; }
.faq dt { font-weight: 600; }
.faq dd { margin: 0; color: var(--muted); }

.foot { padding-top: 4px; padding-bottom: 40px; font-size: 14px; }
.foot p { margin: 4px 0; }

@media (max-width: 760px) {
  section { padding: 18px 16px; }
  .prompts, .checklist { grid-template-columns: 1fr; }
  .steps > li { grid-template-columns: 1fr; }
  .faq { grid-template-columns: 1fr; gap: 2px; }
  .faq dd { margin-bottom: 10px; }
}

/* PDF (Cmd/Ctrl + P หรือไฟล์ handout.pdf): A4 ขาวดำอ่านง่าย ไม่มีปุ่ม */
@media print {
  @page { size: A4; margin: 14mm 12mm; }
  body { background: #fff; font-size: 12.5px; }
  .hero { background: #fff; color: var(--ink); padding: 0 0 8px; border-bottom: 3px solid var(--accent); }
  .hero .sub, .kicker { color: var(--muted); }
  .cta, .toc, .copy { display: none !important; }
  section { border: 0; border-radius: 0; padding: 10px 0; margin: 8px 0; break-inside: auto; }
  .steps > li, .prompts article, .cmd, .tools, .rules li, .checklist li, .faq dt, .faq dd { break-inside: avoid; }
  h2, h3 { break-after: avoid; }
  .prompts article { padding-bottom: 14px; }
  .cmd pre { margin-right: 0; }
  a { color: var(--ink); text-decoration: none; }
  code { font-size: 11px; }
  .cmd code { font-size: 12px; }
  .faq { gap: 4px 16px; }
  .foot { font-size: 10.5px; padding: 0 20px; break-before: avoid; }
}