:root { color-scheme: light; --green: #165337; --ink: #202622; --muted: #626b65; --line: #dfe5e0; --surface: #f5f7f5; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--ink); background: #fff; }
* { box-sizing: border-box; }
body { margin: 0; font-size: 16px; line-height: 1.8; }
a { color: var(--green); text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--green); outline-offset: 5px; border-radius: 4px; }
img { max-width: 100%; }
.skip-link { position: absolute; left: 16px; top: -100px; background: #fff; padding: 12px; z-index: 2; }
.skip-link:focus { top: 10px; }
.guide-header { max-width: 1160px; margin: auto; padding: 24px 36px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--line); }
.guide-header img { display: block; width: 184px; height: auto; }
.guide-header nav, footer nav { display: flex; gap: 26px; flex-wrap: wrap; }
.guide-header nav a { text-decoration: none; font-size: 15px; padding: 8px 0; }
main { max-width: 1120px; margin: auto; padding: 0 36px; }
.guide-hero { max-width: 870px; padding: 72px 0 48px; }
.eyebrow { color: var(--green); font-size: 14px; font-weight: 600; letter-spacing: .04em; margin: 0 0 12px; }
h1, h2, h3 { letter-spacing: -.025em; line-height: 1.35; }
h1 { font-size: clamp(32px, 4.2vw, 52px); margin: 0 0 24px; font-weight: 650; }
h1 span { color: var(--green); }
h2 { font-size: 29px; margin: 0 0 20px; font-weight: 650; }
h3 { font-size: 21px; margin: 0 0 12px; }
p { margin: 0 0 16px; }
.lead { font-size: 19px; max-width: 740px; color: #404a43; }
.byline { color: var(--muted); font-size: 13px; margin: 20px 0; }
.byline time { white-space: nowrap; }
.jump-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.jump-links a { border: 1px solid var(--line); border-radius: 30px; padding: 9px 17px; text-decoration: none; font-size: 15px; }
.jump-links a:hover { background: var(--surface); }
.guide-section { border-top: 1px solid var(--line); padding: 48px 0; scroll-margin-top: 24px; }
.guide-section > p:not(.eyebrow) { max-width: 860px; color: #4b554e; }
.choice-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 28px; }
.choice { padding: 26px; border-radius: 20px; background: var(--surface); }
.number { color: var(--green); display: block; margin-bottom: 26px; font-size: 14px; }
.choice p { margin: 0; color: #4b554e; font-size: 15px; }
.guide-products { display: grid; gap: 18px; margin: 30px 0 22px; }
.guide-product { display: grid; grid-template-columns: 220px 1fr; gap: 38px; align-items: center; padding: 30px; border: 1px solid var(--line); border-radius: 22px; scroll-margin-top: 24px; }
.product-image { background: #fff; display: grid; place-items: center; }
.product-image img { width: 195px; height: 215px; object-fit: contain; }
.guide-product p:not(.eyebrow) { color: #4b554e; font-size: 15px; }
.guide-product .eyebrow { margin-bottom: 8px; font-size: 13px; }
.guide-product h3 { font-size: 25px; }
.product-links { display: flex; flex-wrap: wrap; gap: 12px 24px; font-size: 15px; }
.product-links a { padding: 6px 0; }
.label-note { font-size: 14px; color: var(--muted); }
.faq-list section { padding: 25px 0; border-bottom: 1px solid var(--line); }
.faq-list section:last-child { border: 0; padding-bottom: 0; }
.faq-list h3 { font-size: 19px; }
.faq-list p { color: #4b554e; margin: 0; max-width: 930px; }
.contact-card { display: flex; gap: 30px; justify-content: space-between; align-items: center; padding: 34px; background: var(--surface); border-radius: 22px; margin: 0 0 42px; }
.contact-card h2 { font-size: 26px; margin-bottom: 12px; }
.contact-card p { max-width: 560px; color: #4b554e; margin: 0; }
.contact-actions { display: grid; gap: 12px; flex-shrink: 0; }
.button { background: var(--green); color: #fff; border: 1px solid var(--green); border-radius: 28px; padding: 10px 24px; text-decoration: none; text-align: center; }
.button.secondary { color: var(--green); background: #fff; border-color: #bac6be; }
.button:hover { opacity: .88; }
.sources { color: var(--muted); font-size: 13px; padding-bottom: 36px; }
.sources h2 { font-size: 16px; margin-bottom: 12px; }
footer { background: var(--surface); color: #5c625e; font-size: 13px; padding: 32px max(24px, calc((100vw - 1048px) / 2)); }
footer a { color: #404641; }
footer nav { margin-bottom: 16px; gap: 12px 24px; }
footer p { margin-bottom: 6px; }
@media (max-width: 700px) {
  .guide-header { padding: 18px 22px; flex-wrap: wrap; gap: 12px; }
  .guide-header img { width: 155px; }
  .guide-header nav { gap: 24px; }
  .guide-header nav a { font-size: 14px; }
  main { padding: 0 22px; }
  .guide-hero { padding: 42px 0 32px; }
  .lead { font-size: 17px; }
  h2 { font-size: 25px; }
  .guide-section { padding: 34px 0; }
  .choice-grid { grid-template-columns: 1fr; }
  .choice { padding: 24px; }
  .number { margin-bottom: 10px; }
  .guide-product { grid-template-columns: 1fr; gap: 18px; padding: 24px; }
  .product-image img { width: 164px; height: 178px; }
  .guide-product h3 { font-size: 23px; }
  .guide-product p:not(.eyebrow), .choice p { font-size: 16px; }
  .contact-card { display: block; padding: 25px; }
  .contact-actions { margin-top: 24px; }
  .jump-links { gap: 8px; }
  .jump-links a { font-size: 14px; padding: 8px 13px; }
}