:root {
  --brand: #217346;
  --brand-hover: #185c37;
  --brand-press: #0f3d24;
  --brand-soft: #a9d08e;
  --brand-tint: #eaf6ef;
  --ink: #242424;
  --ink-2: #323130;
  --muted: #605e5c;
  --line: #edebe9;
  --paper: #ffffff;
  --canvas: #f3f2f1;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(33, 115, 70, 0.12);
  --radius: 4px;
  --radius-lg: 10px;
  --font: "Segoe UI Variable", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max: 1080px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 10% -10%, rgba(33, 115, 70, 0.12), transparent 55%),
    radial-gradient(700px 380px at 100% 0%, rgba(169, 208, 142, 0.18), transparent 50%),
    linear-gradient(180deg, #f7fbf8 0%, #ffffff 42%, #f3f2f1 100%);
  line-height: 1.55;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: var(--brand); text-underline-offset: 0.15em; }
.wrap { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

body.lang-en .zh,
html[data-lang="en"] .zh { display: none !important; }
body.lang-zh .en,
html[data-lang="zh"] .en { display: none !important; }
body:not(.lang-en):not(.lang-zh) .en { display: none !important; }

.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 64px;
}
.brand {
  display: inline-flex; align-items: center; gap: .65rem;
  text-decoration: none; color: var(--ink);
}
.brand strong { font-size: 1.05rem; }
.brand small { display: block; font-size: .72rem; color: var(--muted); font-weight: 500; }
.nav { display: flex; gap: 1rem; }
.nav a { text-decoration: none; color: var(--ink-2); font-weight: 600; font-size: .92rem; }
.nav a:hover { color: var(--brand); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .45rem;
  border: 0; border-radius: var(--radius);
  padding: .72rem 1.05rem; font-weight: 650; text-decoration: none; cursor: pointer;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-hover); }
.btn-secondary { background: #fff; color: var(--brand); border: 1px solid #b7d7c3; }
.btn-secondary:hover { background: var(--brand-tint); }
.btn-ghost { background: transparent; color: var(--brand); border: 1px solid transparent; }
.btn-ghost:hover { background: var(--brand-tint); }

.hero { padding: 2.4rem 0 1.5rem; }
.hero-grid {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 2rem; align-items: center;
}
.brand-signal {
  display: inline-flex; align-items: center; gap: .55rem;
  font-weight: 700; color: var(--brand); margin: 0 0 .8rem;
}
.hero h1 { margin: 0 0 .75rem; font-size: clamp(1.8rem, 3.4vw, 2.55rem); line-height: 1.18; }
.lead { margin: 0 0 1.25rem; color: var(--muted); font-size: 1.05rem; max-width: 36rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: .7rem; }
.hero-points { margin: 1.2rem 0 0; padding-left: 1.15rem; color: var(--muted); }
.hero-points li { margin: .35rem 0; }
.hero-visual {
  background: linear-gradient(160deg, #217346, #0f3d24);
  border-radius: 16px; min-height: 280px;
  display: grid; place-items: center; padding: 1.5rem;
  box-shadow: var(--shadow);
}
.hero-visual img { width: min(180px, 55%); filter: drop-shadow(0 12px 28px rgba(0,0,0,.25)); }

.section { padding: 2rem 0; }
.section-alt { background: rgba(255,255,255,.55); }
.section h2 { margin: 0 0 .4rem; font-size: 1.45rem; }
.sub { margin: 0 0 1.2rem; color: var(--muted); }
.channel-list { display: grid; gap: .75rem; }
.channel {
  display: grid; grid-template-columns: auto 1fr auto; gap: .9rem; align-items: center;
  padding: 1rem 1.1rem; border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: #fff; text-decoration: none; color: inherit; box-shadow: var(--shadow);
}
.channel h3 { margin: 0 0 .2rem; font-size: 1.02rem; }
.channel p { margin: 0; color: var(--muted); font-size: .93rem; }
.channel .go { color: var(--brand); font-weight: 700; }
.channel-static { cursor: default; }

.steps { margin: 0; padding-left: 1.2rem; max-width: 42rem; color: var(--ink-2); }
.steps li { margin: .7rem 0; }
.tip-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: .9rem; margin-top: 1rem;
}
.tip {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 1rem 1.05rem; box-shadow: var(--shadow);
}
.tip h3 { margin: 0 0 .35rem; font-size: 1rem; }
.tip p { margin: 0; color: var(--muted); font-size: .93rem; }

.faq details {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: .85rem 1rem; margin: .55rem 0;
}
.faq summary { cursor: pointer; font-weight: 650; }
.faq p { margin: .55rem 0 0; color: var(--muted); }
details summary.zh, details summary.en { display: list-item; }
body.lang-en details summary.zh,
body.lang-zh details summary.en { display: none !important; }

.cta-banner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem;
  background: linear-gradient(135deg, #217346, #0f3d24); color: #fff;
  border-radius: 12px; padding: 1.35rem 1.45rem;
}
.cta-banner h2 { margin: 0 0 .3rem; color: #fff; font-size: 1.3rem; }
.cta-banner p { margin: 0; opacity: .92; }
.cta-banner .btn-primary { background: #fff; color: #0f3d24; }
.cta-banner .btn-primary:hover { background: #eaf6ef; }

.site-footer { border-top: 1px solid var(--line); padding: 1.2rem 0 1.8rem; margin-top: 1rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center; }
.footer-brand { display: flex; gap: .7rem; align-items: center; }
.fine { display: block; font-size: .8rem; color: var(--muted); font-weight: 400; }
.site-footer nav { display: flex; gap: .9rem; }
.site-footer nav a { text-decoration: none; color: var(--ink-2); font-weight: 600; font-size: .88rem; }

@media (max-width: 860px) {
  .nav { display: none; }
  .hero-grid { grid-template-columns: 1fr; }
  .tip-grid { grid-template-columns: 1fr; }
  .hero-visual { min-height: 200px; }
}