:root {
  --primary: #24a85d;
  --primary-focus: #1f9553;
  --primary-deep: #156236;
  --primary-on-dark: #34c778;
  --ink: #1d1d1f;
  --ink-muted-80: #333336;
  --ink-muted-48: #7a7a7e;
  --divider-soft: #f0f0f0;
  --hairline: #e0e0e0;
  --canvas: #ffffff;
  --parchment: #f5f5f7;
  --black: #000000;
  --r-sm: 8px;
  --r-md: 11px;
  --r-lg: 18px;
  --r-pill: 9999px;
  --font-display: "SF Pro Display", -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-text: "SF Pro Text", -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-text);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: -0.374px;
  color: var(--ink);
  background: var(--canvas);
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
::selection { background: var(--primary); color: #fff; }

/* NAV */
.global-nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--black); color: #fff; height: 56px;
}
.global-nav-inner {
  max-width: 1024px; height: 100%; margin: 0 auto; padding: 0 22px;
  display: flex; align-items: center; gap: 24px;
  font-size: 13px; letter-spacing: -0.12px;
}
.global-nav-inner a { color: #fff; opacity: 0.88; transition: opacity .2s; }
.global-nav-inner a:hover { opacity: 1; }
.global-nav-inner .gnav-brand { display: flex; align-items: center; opacity: 1; margin-right: 8px; }
.global-nav-inner .gnav-brand img { height: 26px; width: auto; display: block; }
.global-nav-inner .spacer { flex: 1; }
.global-nav-inner .nav-cta {
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 500;
  padding: 7px 18px;
  border-radius: var(--r-pill);
  background: var(--primary);
  color: #fff;
  transition: background .2s;
  white-space: nowrap;
}
.global-nav-inner .nav-cta:hover { background: var(--primary-focus); }
@media (max-width: 700px) { .global-nav-inner .gnav-link.collapsible { display: none; } }

/* ARTICLE LAYOUT */
.article-wrap { max-width: 720px; margin: 0 auto; padding: 64px 24px 80px; }
.crumb {
  font-size: 13px;
  letter-spacing: -0.12px;
  color: var(--ink-muted-48);
  margin-bottom: 24px;
}
.crumb a { color: var(--primary); }
.crumb a:hover { text-decoration: underline; }
h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.28px;
  margin-bottom: 14px;
}
.meta {
  font-size: 13px;
  letter-spacing: -0.12px;
  color: var(--ink-muted-48);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--divider-soft);
  margin-bottom: 32px;
}
article h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.374px;
  margin: 40px 0 14px;
}
article p { margin-bottom: 16px; color: var(--ink-muted-80); }
article ul, article ol { margin: 0 0 16px 22px; color: var(--ink-muted-80); }
article li { margin-bottom: 8px; }
article strong { color: var(--ink); font-weight: 600; }
.tip {
  background: var(--parchment);
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 15px;
  color: var(--ink-muted-80);
}
.article-foot {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--divider-soft);
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-size: 15px;
  font-weight: 500;
}
.back-link:hover { text-decoration: underline; }

/* GUIDES INDEX */
.guides-wrap { max-width: 880px; margin: 0 auto; padding: 64px 24px 80px; }
.guides-head { text-align: center; margin-bottom: 48px; }
.guides-head .eyebrow {
  display: inline-block;
  font-size: 14px; font-weight: 600;
  letter-spacing: -0.224px;
  color: var(--primary);
  margin-bottom: 12px;
}
.guides-head h1 { margin-bottom: 12px; }
.guides-head p { color: var(--ink-muted-80); max-width: 560px; margin: 0 auto; }
.guide-list { display: flex; flex-direction: column; gap: 16px; }
.guide-item {
  display: block;
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: 28px 32px;
  transition: transform .2s ease, box-shadow .2s ease;
}
.guide-item:hover {
  transform: translateY(-2px);
  box-shadow: rgba(0,0,0,0.08) 0 10px 30px -10px;
}
.guide-item h3 {
  font-family: var(--font-display);
  font-size: 19px; font-weight: 600;
  letter-spacing: -0.374px;
  margin-bottom: 6px;
}
.guide-item p {
  font-size: 15px; line-height: 1.55;
  letter-spacing: -0.224px;
  color: var(--ink-muted-80);
  margin-bottom: 10px;
}
.guide-item .gi-meta {
  font-size: 13px;
  color: var(--ink-muted-48);
  letter-spacing: -0.12px;
}
.guide-item .gi-meta .read { color: var(--primary); font-weight: 500; }

/* FOOTER */
footer { background: var(--parchment); color: var(--ink-muted-80); padding: 40px 24px 28px; margin-top: 40px; }
.foot-inner { max-width: 1024px; margin: 0 auto; text-align: center; }
.foot-inner img { height: 22px; width: auto; margin: 0 auto 12px; }
.foot-bottom {
  font-size: 12px; letter-spacing: -0.12px; color: var(--ink-muted-48);
  display: flex; flex-direction: column; gap: 6px; align-items: center;
}
.foot-bottom a { color: var(--ink-muted-48); }
.foot-bottom a:hover { color: var(--primary); }