:root {
  --ink: #1d2423;
  --muted: #606a68;
  --line: #d9e0de;
  --soft: #f4f7f6;
  --teal: #087d73;
  --deep: #075e57;
  --charcoal: #272a29;
  --yellow: #c9a33c;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  line-height: 1.7;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }

.header-inner,
.hero-inner,
.shell,
.page-inner,
.article-grid,
.faq-grid,
.footer-inner {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: relative;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}
.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.brand { display: flex; align-items: center; gap: 11px; font-size: 20px; font-weight: 800; }
.brand img { width: 42px; height: 42px; border-radius: 4px; }
.main-nav { display: flex; align-items: center; gap: 5px; }
.main-nav a { padding: 9px 14px; border-radius: 4px; color: #4b5552; }
.main-nav a.active,
.main-nav a:hover { color: var(--deep); background: #edf5f3; }
.main-nav .nav-download { margin-left: 8px; color: #ffffff; background: var(--teal); }
.main-nav .nav-download:hover { color: #ffffff; background: var(--deep); }
.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #ffffff;
  font-size: 22px;
}

.hero { border-bottom: 1px solid var(--line); background: #f7f9f8; }
.hero-inner {
  min-height: 605px;
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  align-items: center;
  gap: 64px;
  padding: 44px 0;
}
.eyebrow,
.section-title > span,
.comparison-grid > div > span,
.setup-grid > div > span,
.page-inner > span,
.article article section > span,
.faq-intro > span,
.cta span {
  color: var(--teal);
  font-size: 12px;
  font-weight: 850;
}
.hero h1 {
  max-width: 530px;
  margin: 14px 0 18px;
  font-size: clamp(40px, 4.2vw, 57px);
  line-height: 1.16;
  letter-spacing: 0;
}
.keep { white-space: nowrap; }
.hero-copy > p { max-width: 530px; margin: 0; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 27px; }
.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-weight: 750;
}
.button.primary { color: #ffffff; background: var(--teal); }
.button.primary:hover { background: var(--deep); }
.button.secondary { border-color: var(--line); background: #ffffff; }
.button.light { color: var(--deep); background: #ffffff; }
.mode-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 29px; }
.mode-tags span { padding: 5px 10px; border: 1px solid var(--line); color: var(--muted); background: #ffffff; font-size: 11px; }

.mode-canvas {
  min-height: 475px;
  border: 1px solid #cbd7d4;
  background: #ffffff;
  box-shadow: 0 20px 46px rgba(20, 65, 58, 0.1);
}
.canvas-tabs { min-height: 46px; display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.canvas-tabs span { display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: 12px; }
.canvas-tabs span + span { border-left: 1px solid var(--line); }
.canvas-tabs .active { color: #ffffff; background: var(--charcoal); }
.canvas-body { position: relative; height: 335px; overflow: hidden; background: linear-gradient(90deg, #292c2b 0%, #292c2b 57%, #f2f5f4 57%); }
.canvas-body figure { position: absolute; margin: 0; overflow: hidden; border: 5px solid #ffffff; background: #ffffff; box-shadow: 0 9px 24px rgba(0, 0, 0, 0.16); }
.canvas-body img { width: auto; max-width: 400px; height: 100%; object-fit: contain; }
.dark-screen { z-index: 3; top: 18px; left: 18%; height: 310px; }
.light-screen { z-index: 2; top: 45px; right: 7%; height: 280px; }
.site-strip { min-height: 94px; display: grid; grid-template-columns: 92px 1fr; gap: 16px; align-items: center; padding: 10px 16px; }
.site-strip figure { height: 74px; margin: 0; overflow: hidden; border: 1px solid var(--line); }
.site-strip img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.site-strip strong,
.site-strip span { display: block; }
.site-strip span { color: var(--muted); font-size: 12px; }

.mode-band { border-bottom: 1px solid var(--line); background: #ffffff; }
.mode-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.mode-grid > div { min-height: 112px; display: grid; align-content: center; padding: 16px 24px; border-right: 1px solid var(--line); }
.mode-grid > div:first-child { border-left: 1px solid var(--line); }
.mode-grid span { color: var(--yellow); font-size: 12px; font-weight: 800; }
.mode-grid strong,
.mode-grid small { display: block; }
.mode-grid small { color: var(--muted); }

.section { padding: 82px 0; }
.section-title { display: grid; grid-template-columns: 145px 1fr; align-items: end; margin-bottom: 32px; }
.section h2,
.faq-intro h2 { margin: 0; font-size: 34px; line-height: 1.25; letter-spacing: 0; }
.features { background: #ffffff; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.feature-grid article { min-height: 240px; padding: 25px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-grid b { color: var(--yellow); font-size: 12px; }
.feature-grid h3 { margin: 46px 0 8px; font-size: 20px; }
.feature-grid p,
.comparison-grid > div > div,
.setup-list p,
.article p,
.faq-intro p { color: var(--muted); }

.comparison { background: var(--soft); }
.comparison-grid { display: grid; grid-template-columns: 0.58fr 1.42fr; gap: 60px; align-items: center; }
.comparison-grid h2 { margin: 10px 0 16px; }
.comparison-screens { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; align-items: end; }
.comparison-screens figure { min-width: 0; margin: 0; padding: 10px; border: 1px solid var(--line); background: #ffffff; }
.comparison-screens .dark-card { color: #ffffff; border-color: #3f4543; background: var(--charcoal); transform: translateY(-22px); }
.comparison-screens img { width: auto; max-width: 100%; height: 305px; margin: 0 auto; object-fit: contain; }
.comparison-screens figcaption { padding-top: 10px; color: var(--muted); text-align: center; font-size: 13px; }
.comparison-screens .dark-card figcaption { color: #d8dfdd; }

.setup { background: #ffffff; }
.setup-grid { display: grid; grid-template-columns: 0.62fr 1.38fr; gap: 70px; }
.setup-grid h2 { margin-top: 10px; }
.setup-list { border-top: 1px solid var(--line); }
.setup-list article { display: grid; grid-template-columns: 210px 1fr; gap: 28px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.setup-list p { margin: 0; }

.resources { padding-top: 0; }
.resources-grid { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); }
.resources-grid article { padding: 34px; }
.resources-grid article + article { border-left: 1px solid var(--line); }
.resources-grid article > span { color: var(--yellow); font-size: 12px; font-weight: 800; }
.resources-grid h2 { margin: 9px 0 12px; font-size: 28px; }
.resources-grid article > div { margin-bottom: 15px; color: var(--muted); }
.resources-grid a { color: var(--deep); font-weight: 750; }

.cta { color: #ffffff; background: var(--charcoal); }
.cta-inner { min-height: 190px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.cta span { color: #a8ddd6; }
.cta h2 { margin: 6px 0 0; font-size: 30px; }
footer { padding: 28px 0; border-top: 1px solid var(--line); background: #ffffff; }
.footer-inner { color: var(--muted); text-align: center; font-size: 13px; }
.footer-inner p { margin: 4px 0; }

.page-hero { border-bottom: 1px solid var(--line); background: #eef5f3; }
.page-hero.dark-page { color: #ffffff; background: var(--charcoal); }
.dark-page .page-inner > span { color: #95d7cf; }
.dark-page .page-inner p { color: #d3dcda; }
.page-inner { max-width: 900px; padding: 72px 0 66px; }
.page-inner h1 { margin: 13px 0 17px; font-size: 45px; line-height: 1.24; }
.page-inner p { max-width: 770px; margin: 0; color: var(--muted); font-size: 17px; }
.article,
.faq-page { padding: 72px 0 90px; }
.article-grid,
.faq-grid { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 70px; align-items: start; }
.article aside { position: sticky; top: 22px; display: grid; gap: 4px; padding: 22px; border: 1px solid var(--line); }
.article aside strong { margin-bottom: 8px; }
.article aside a { padding: 6px 0; color: var(--muted); }
.article article { max-width: 800px; }
.article article section { padding-bottom: 46px; margin-bottom: 46px; border-bottom: 1px solid var(--line); }
.article h2 { margin: 8px 0 0; font-size: 31px; }
.article-note { margin-top: 22px; padding: 18px 22px; border-left: 3px solid var(--yellow); background: #f8f5e9; }
.article-note p { margin: 4px 0 0; }
.faq-intro { position: sticky; top: 22px; }
.faq-intro h2 { margin-top: 10px; }
.faq-intro a { color: var(--deep); font-weight: 750; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 17px 3px; font-weight: 750; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: var(--yellow); font-size: 24px; }
.faq-list details p { margin: 0; padding: 0 46px 22px 3px; color: var(--muted); }

@media (max-width: 920px) {
  .hero-inner { grid-template-columns: 1fr 1fr; gap: 30px; }
  .dark-screen { left: 10%; }
  .light-screen { right: 3%; }
}

@media (max-width: 760px) {
  .header-inner,
  .hero-inner,
  .shell,
  .page-inner,
  .article-grid,
  .faq-grid,
  .footer-inner { width: min(100% - 32px, 1180px); }
  .header-inner { min-height: 62px; }
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .main-nav { position: absolute; top: 62px; right: 16px; left: 16px; display: none; padding: 10px; border: 1px solid var(--line); background: #ffffff; box-shadow: 0 18px 38px rgba(20, 65, 58, 0.14); }
  .main-nav.open { display: grid; }
  .main-nav .nav-download { margin-left: 0; text-align: center; }
  .hero-inner { min-height: auto; grid-template-columns: 1fr; gap: 23px; padding: 32px 0 27px; }
  .hero h1 { margin-top: 10px; font-size: 34px; }
  .hero-copy > p { font-size: 15px; }
  .hero-actions { margin-top: 20px; }
  .mode-tags { margin-top: 20px; }
  .mode-canvas { min-height: 282px; }
  .canvas-tabs { min-height: 36px; }
  .canvas-body { height: 205px; }
  .dark-screen { top: 9px; left: 15%; height: 190px; }
  .light-screen { top: 28px; right: 5%; height: 160px; }
  .site-strip { min-height: 40px; grid-template-columns: 54px 1fr; padding: 5px 10px; }
  .site-strip figure { height: 32px; }
  .site-strip div { display: flex; justify-content: space-between; gap: 8px; font-size: 12px; }
  .mode-grid > div { min-height: 92px; padding: 12px; }
  .mode-grid small { font-size: 12px; }
  .section { padding: 58px 0; }
  .section-title { grid-template-columns: 1fr; gap: 8px; }
  .section h2,
  .faq-intro h2 { font-size: 29px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid article { min-height: auto; }
  .feature-grid h3 { margin-top: 24px; }
  .comparison-grid,
  .setup-grid,
  .article-grid,
  .faq-grid { grid-template-columns: 1fr; gap: 30px; }
  .comparison-screens { gap: 7px; }
  .comparison-screens figure { padding: 6px; }
  .comparison-screens img { height: 205px; }
  .setup-list article { grid-template-columns: 1fr; gap: 6px; }
  .resources-grid { grid-template-columns: 1fr; }
  .resources-grid article + article { border-top: 1px solid var(--line); border-left: 0; }
  .cta-inner { min-height: 205px; align-items: flex-start; flex-direction: column; justify-content: center; }
  .page-inner { padding: 54px 0 48px; }
  .page-inner h1 { font-size: 35px; }
  .article,
  .faq-page { padding: 50px 0 65px; }
  .article aside { display: none; }
  .faq-intro { position: static; }
}

@media (max-width: 420px) {
  .hero h1 { font-size: 31px; }
  .hero-actions .button { flex: 1 1 140px; }
  .mode-tags span { padding: 4px 7px; }
  .comparison-screens img { height: 180px; }
}