:root {
  color-scheme: light;
  --ink: #17342a;
  --muted: #62766f;
  --line: rgba(23, 52, 42, 0.12);
  --green: #176f4b;
  --paper: #f4f7f1;
  --white: #fff;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); }
img { max-width: 100%; }
a { color: inherit; }

.knowledge-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 12px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
  background: rgba(244, 247, 241, 0.92);
  backdrop-filter: blur(18px);
}

.knowledge-brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; }
.knowledge-brand img { border-radius: 12px; }
.knowledge-brand span, .knowledge-brand strong, .knowledge-brand small { display: block; }
.knowledge-brand strong { font-size: 18px; }
.knowledge-brand small { margin-top: 2px; color: var(--muted); font-size: 11px; }
.knowledge-header nav { display: flex; align-items: center; gap: 24px; }
.knowledge-header nav a { font-size: 14px; font-weight: 680; text-decoration: none; }
.knowledge-header .nav-primary { padding: 11px 17px; border-radius: 999px; color: #fff; background: var(--green); }

main { overflow: hidden; }
.breadcrumbs { max-width: 1180px; margin: 0 auto; padding: 34px 24px 0; color: var(--muted); font-size: 13px; }
.breadcrumbs a { text-decoration: none; }
.breadcrumbs span { margin-left: 8px; }

.knowledge-hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(58px, 8vw, 108px) 24px clamp(70px, 9vw, 122px);
}

.eyebrow { margin: 0; color: var(--green); font-size: 13px; font-weight: 820; letter-spacing: 0.12em; text-transform: uppercase; }
.knowledge-hero h1 { max-width: 940px; margin: 16px 0 28px; font-size: clamp(44px, 7vw, 88px); line-height: 1.02; letter-spacing: -0.055em; }
.no-break { white-space: nowrap; }
.direct-answer { max-width: 880px; margin: 0; color: #405b51; font-size: clamp(19px, 2vw, 25px); line-height: 1.82; }
.answer-note { max-width: 880px; margin: 18px 0 0; padding-left: 15px; border-left: 3px solid #d0a54a; color: var(--muted); line-height: 1.7; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.hero-actions a { display: inline-flex; min-height: 48px; align-items: center; padding: 0 21px; border: 1px solid var(--line); border-radius: 999px; font-weight: 750; text-decoration: none; background: #fff; }
.hero-actions .primary { color: #fff; border-color: var(--green); background: var(--green); }

.knowledge-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; max-width: 1180px; margin: 0 auto; padding: 0 24px 80px; }
.knowledge-grid article { min-height: 260px; padding: 32px; border: 1px solid var(--line); border-radius: 28px; background: rgba(255, 255, 255, 0.85); box-shadow: 0 18px 55px rgba(48, 75, 64, 0.07); }
.knowledge-grid h2 { margin: 0 0 16px; font-size: 25px; letter-spacing: -0.02em; }
.knowledge-grid p { margin: 0; color: var(--muted); line-height: 1.85; }

.knowledge-links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; max-width: 1180px; margin: -32px auto 96px; padding: 0 24px; }
.knowledge-links a { display: flex; justify-content: space-between; gap: 16px; padding: 18px 20px; border-bottom: 1px solid var(--line); font-weight: 760; text-decoration: none; }
.knowledge-links a span { color: var(--green); }

.faq-section { display: grid; grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.3fr); gap: 60px; padding: clamp(72px, 9vw, 120px) max(24px, calc((100vw - 1132px) / 2)); background: #17342a; color: #fff; }
.faq-section h2 { margin: 12px 0 0; font-size: clamp(36px, 5vw, 64px); }
.faq-section .eyebrow { color: #9ad0b6; }
.faq-list details { border-bottom: 1px solid rgba(255, 255, 255, 0.18); }
.faq-list summary { padding: 22px 38px 22px 0; cursor: pointer; font-size: 18px; font-weight: 760; line-height: 1.55; }
.faq-list p { margin: -4px 0 24px; color: #c9d8d1; line-height: 1.8; }

.knowledge-cta { display: flex; align-items: center; justify-content: space-between; gap: 40px; max-width: 1180px; margin: 0 auto; padding: 88px 24px; }
.knowledge-cta h2 { max-width: 760px; margin: 12px 0; font-size: clamp(34px, 5vw, 62px); line-height: 1.06; letter-spacing: -0.04em; }
.knowledge-cta p:not(.eyebrow) { color: var(--muted); }
.knowledge-cta img { padding: 8px; border-radius: 24px; background: #fff; box-shadow: 0 18px 60px rgba(48, 75, 64, 0.14); }

footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 18px 36px; padding: 36px clamp(24px, 5vw, 72px); border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; line-height: 1.7; background: #eef3ec; }
footer p { margin: 0; }
footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
footer a { text-decoration: none; }

@media (max-width: 820px) {
  .knowledge-header nav a:not(.nav-primary) { display: none; }
  .knowledge-grid, .knowledge-links { grid-template-columns: 1fr; }
  .knowledge-grid article { min-height: 0; }
  .faq-section { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 560px) {
  .knowledge-header { min-height: 68px; }
  .knowledge-brand small { display: none; }
  .knowledge-hero h1 { font-size: 44px; }
  .knowledge-cta { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}