:root {
  color-scheme: light;
  --green: #1f5a3c;
  --green-dark: #173e2d;
  --orange: #d77a24;
  --ink: #17251e;
  --muted: #5d6d64;
  --line: #d9e1dc;
  --surface: #f7f8f5;
  --white: #fff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif; line-height: 1.65; letter-spacing: 0; }
a { color: inherit; }

.guide-header { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 68px; padding: 10px clamp(18px, 4vw, 48px); border-bottom: 1px solid var(--line); background: rgb(255 255 255 / 96%); }
.guide-brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.guide-brand span { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 50%; color: var(--white); background: var(--green); font-weight: 800; }
.guide-header nav { display: flex; gap: 20px; }
.guide-header nav a { color: var(--green-dark); font-weight: 700; text-decoration: none; }

main { width: min(100%, 1080px); margin: 0 auto; }
.guide-intro, .guide-section { padding: 64px clamp(20px, 5vw, 64px); }
.guide-intro { min-height: 430px; display: grid; align-content: center; justify-items: start; background: var(--surface); }
.eyebrow { margin: 0 0 6px; color: var(--orange); font-size: 0.93rem; font-weight: 800; }
h1, h2, p { margin-top: 0; }
h1 { max-width: 720px; margin-bottom: 16px; font-size: clamp(2rem, 5vw, 3.5rem); line-height: 1.18; }
h2 { margin-bottom: 0; font-size: clamp(1.55rem, 3vw, 2.2rem); line-height: 1.3; }
.guide-intro > p:not(.eyebrow) { max-width: 680px; color: var(--muted); font-size: 1.08rem; }
.primary-action { display: inline-flex; min-height: 52px; align-items: center; justify-content: center; padding: 12px 24px; border-radius: 6px; color: var(--white); background: var(--green); font-weight: 800; text-decoration: none; }

.guide-section { border-top: 1px solid var(--line); scroll-margin-top: 68px; }
.section-heading { margin-bottom: 28px; }
.product-layout { display: grid; grid-template-columns: minmax(260px, 0.9fr) minmax(320px, 1.1fr); gap: 36px; align-items: start; }
.product-layout img { width: 100%; height: auto; border: 1px solid var(--line); border-radius: 6px; }
.product-list { margin: 0; padding: 0; list-style: none; }
.product-list li { display: grid; grid-template-columns: 1fr auto; gap: 18px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.product-list span { color: var(--muted); text-align: right; }

.facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 0; border-top: 1px solid var(--line); }
.facts div { padding: 20px 0; border-bottom: 1px solid var(--line); }
.facts div:nth-child(odd) { padding-right: 28px; }
.facts div:nth-child(even) { padding-left: 28px; border-left: 1px solid var(--line); }
.facts dt { color: var(--green); font-weight: 800; }
.facts dd { margin: 4px 0 0; color: var(--muted); }

.steps { display: grid; gap: 0; margin: 0 0 24px; padding: 0; list-style: none; }
.steps li { display: grid; grid-template-columns: 44px 1fr; gap: 14px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.steps li > span { display: grid; width: 36px; height: 36px; place-items: center; border-radius: 50%; color: var(--white); background: var(--orange); font-weight: 800; }
.steps strong { font-size: 1.06rem; }
.steps p { margin-bottom: 0; color: var(--muted); }
.boundary-note { max-width: 760px; padding-left: 14px; border-left: 4px solid var(--orange); color: var(--muted); }
footer { padding: 28px 20px 96px; color: #dbe5df; background: var(--green-dark); text-align: center; }

@media (max-width: 720px) {
  .guide-header { align-items: flex-start; flex-direction: column; gap: 6px; }
  .guide-header nav { width: 100%; justify-content: space-between; gap: 8px; font-size: 0.92rem; }
  .guide-intro, .guide-section { padding: 42px 20px; }
  .guide-intro { min-height: 390px; }
  .product-layout { grid-template-columns: 1fr; gap: 24px; }
  .product-list li { grid-template-columns: 1fr; gap: 2px; }
  .product-list span { text-align: left; }
  .facts { grid-template-columns: 1fr; }
  .facts div:nth-child(odd), .facts div:nth-child(even) { padding: 18px 0; border-left: 0; }
  .primary-action { width: 100%; }
}