:root {
  font-family: "Microsoft YaHei UI", "PingFang SC", "Segoe UI", sans-serif;
  color: #20242c;
  background: #f5f7fa;
  font-synthesis: none;
  letter-spacing: 0;
  --ink: #20242c;
  --muted: #737b87;
  --line: #dfe3e8;
  --paper: #ffffff;
  --mint: #f45b5b;
  --mint-dark: #d94848;
  --gold: #b7791f;
  --red: #d94855;
  --blue: #3f8fd8;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; min-height: 100vh; background: #f5f7fa; }
body, button, a { letter-spacing: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { max-width: 100%; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 max(24px, calc((100vw - 1200px) / 2));
  border-bottom: 1px solid rgba(223, 227, 232, .94);
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(14px);
}

.brand { display: inline-flex; align-items: center; gap: 11px; min-width: 0; }
.brand img { width: 38px; height: 38px; border-radius: 8px; }
.brand span { display: grid; gap: 2px; }
.brand strong { color: var(--ink); font-size: 15px; }
.brand small { color: #77858b; font-size: 10px; }
.site-nav { display: flex; align-items: center; gap: 24px; }
.site-nav > a { color: #525a66; font-size: 13px; }
.site-nav > a:hover { color: var(--mint-dark); }
.site-nav .header-download { display: inline-flex; align-items: center; gap: 7px; min-height: 38px; padding: 0 15px; border-radius: 6px; color: #fff; background: var(--ink); font-weight: 700; }
.site-nav .header-download:hover { color: #fff; background: #23353d; }
.menu-button { display: none; width: 40px; height: 40px; padding: 10px; border: 0; background: transparent; }
.menu-button span { display: block; height: 2px; margin: 4px 0; background: var(--ink); }


.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: min(680px, calc(100vh - 112px));
  padding: 88px max(24px, calc((100vw - 1200px) / 2));
  overflow: hidden;
  color: #fff;
  background-color: #191c22;
  background-image: url("/site/assets/product-dashboard.png?v=0.3.42");
  background-position: center;
  background-size: cover;
}
.hero-shade { position: absolute; inset: 0; background: rgba(14, 16, 20, .78); }
.hero-content { position: relative; z-index: 1; width: min(660px, 100%); }
.eyebrow { margin: 0 0 15px; color: var(--mint-dark); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.hero .eyebrow { color: #ff817b; }
.hero h1 { margin: 0; font-size: 58px; line-height: 1.08; }
.hero-copy { max-width: 610px; margin: 24px 0 0; color: #e0e3e7; font-size: 18px; line-height: 1.85; }
.hero-actions, .download-actions { display: flex; align-items: stretch; gap: 12px; margin-top: 34px; }
.primary-action, .secondary-action { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; border-radius: 7px; font-weight: 800; }
.primary-action { gap: 12px; padding: 0 22px; color: #fff; background: var(--mint); box-shadow: 0 12px 30px rgba(0, 0, 0, .18); }
.primary-action > span:first-child { font-size: 22px; }
.primary-action > span:last-child { display: grid; gap: 2px; }
.primary-action small { font-size: 9px; font-weight: 600; opacity: .72; }
.primary-action:hover { background: var(--mint-dark); }
.secondary-action { padding: 0 20px; border: 1px solid rgba(255,255,255,.42); color: #fff; background: rgba(7, 17, 22, .28); }
.secondary-action:hover { border-color: #fff; background: rgba(7, 17, 22, .5); }
.hero-facts { display: flex; flex-wrap: wrap; gap: 12px 24px; margin-top: 36px; color: #c5cad1; font-size: 11px; }
.hero-facts span::before { content: ""; display: inline-block; width: 6px; height: 6px; margin-right: 8px; border-radius: 50%; background: var(--mint); vertical-align: 1px; }

.platform-section, .workflow-section, .faq-section { width: min(1200px, calc(100% - 48px)); margin: 0 auto; padding: 94px 0; }
.section-heading { max-width: 720px; }
.section-heading h2, .product-copy h2, .trust-section h2, .download-section h2 { margin: 0; color: var(--ink); font-size: 36px; line-height: 1.3; }
.section-heading > p:last-child, .product-copy > p, .download-section p { color: var(--muted); font-size: 14px; line-height: 1.8; }
.section-heading > p:last-child { margin: 16px 0 0; }
.platform-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-top: 40px; }
.platform-item { display: flex; gap: 15px; min-height: 180px; padding: 24px; border: 1px solid var(--line); border-radius: 8px; background: var(--paper); }
.platform-item > span { display: grid; place-items: center; flex: 0 0 42px; width: 42px; height: 42px; border-radius: 8px; color: #fff; font-size: 15px; font-weight: 900; }
.platform-item h3 { margin: 3px 0 10px; color: var(--ink); font-size: 17px; }
.platform-item p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.75; }
.platform-douyin > span { background: #151b20; }
.platform-kuaishou > span { background: #e85f2f; }
.platform-xhs > span { background: var(--red); }
.platform-bilibili > span { background: var(--blue); }

.product-section { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(360px, .75fr); align-items: center; gap: 68px; padding: 94px max(24px, calc((100vw - 1280px) / 2)); background: #1b1e24; }
.product-visual { overflow: hidden; border: 1px solid #373c45; border-radius: 8px; box-shadow: 0 32px 80px rgba(0,0,0,.3); }
.product-visual img { display: block; width: 100%; }
.product-copy .eyebrow { color: #ff817b; }
.product-copy h2 { color: #fff; }
.product-copy > p { color: #c3c8cf; }
.feature-list { display: grid; gap: 0; margin: 28px 0 0; }
.feature-list > div { display: grid; grid-template-columns: 118px 1fr; gap: 16px; padding: 17px 0; border-top: 1px solid #373c45; }
.feature-list dt { color: #fff; font-size: 13px; font-weight: 800; }
.feature-list dd { margin: 0; color: #aab1bb; font-size: 12px; line-height: 1.7; }

.workflow-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin: 48px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.workflow-list li { display: flex; gap: 18px; min-height: 190px; padding: 28px 26px; border-right: 1px solid var(--line); }
.workflow-list li:last-child { border-right: 0; }
.workflow-list > li > span { color: var(--gold); font-size: 13px; font-weight: 900; }
.workflow-list h3 { margin: 0 0 12px; color: var(--ink); font-size: 17px; }
.workflow-list p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.75; }

.trust-section { display: grid; grid-template-columns: minmax(280px, .7fr) minmax(0, 1.3fr); gap: 80px; padding: 82px max(24px, calc((100vw - 1200px) / 2)); background: #eef1f5; }
.trust-points { display: grid; gap: 0; }
.trust-points p { display: grid; grid-template-columns: 130px 1fr; gap: 20px; margin: 0; padding: 20px 0; border-top: 1px solid #d2d7de; }
.trust-points p:last-child { border-bottom: 1px solid #d2d7de; }
.trust-points strong { color: var(--ink); font-size: 13px; }
.trust-points span { color: var(--muted); font-size: 12px; line-height: 1.7; }

.faq-section { display: grid; grid-template-columns: minmax(220px, .55fr) minmax(0, 1.45fr); gap: 80px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 23px 44px 23px 0; color: var(--ink); font-size: 14px; font-weight: 800; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 4px; top: 18px; color: var(--mint-dark); font-size: 22px; font-weight: 400; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { margin: -6px 0 22px; color: var(--muted); font-size: 12px; line-height: 1.8; }

.download-section { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding: 70px max(24px, calc((100vw - 1200px) / 2)); color: #fff; background: #292d35; }
.download-section .eyebrow { color: #ff817b; }
.download-section h2 { color: #fff; }
.download-section p { margin: 12px 0 0; color: #c8cdd4; }
.download-section .download-actions { flex: 0 0 auto; margin-top: 0; }

.site-footer { display: grid; grid-template-columns: 1fr auto; gap: 26px 50px; padding: 44px max(24px, calc((100vw - 1200px) / 2)); color: #949ba6; background: #14171c; }
.footer-brand strong { color: #fff; }
.site-footer nav { display: flex; align-items: center; gap: 22px; font-size: 11px; }
.site-footer nav a:hover { color: #fff; }
.site-footer > p { grid-column: 1 / -1; margin: 0; padding-top: 20px; border-top: 1px solid #27343a; font-size: 10px; }
.download-toast { position: fixed; right: 20px; bottom: 20px; z-index: 30; max-width: 360px; padding: 14px 18px; border: 1px solid #ead5a8; border-radius: 7px; color: #66490e; background: #fff8e7; box-shadow: 0 16px 40px rgba(12,28,23,.2); font-size: 12px; }

@media (max-width: 980px) {
  .site-header { min-height: 64px; padding-inline: 18px; }
  .menu-button { display: block; }
  .site-nav { position: absolute; top: 64px; left: 0; right: 0; display: none; align-items: stretch; padding: 12px 18px 18px; border-bottom: 1px solid var(--line); background: #fff; box-shadow: 0 18px 40px rgba(15,30,25,.1); }
  .site-nav.is-open { display: grid; }
  .site-nav > a { display: flex; align-items: center; min-height: 42px; padding: 0 8px; }
  .site-nav .header-download { justify-content: center; padding-inline: 15px; }
  .hero { min-height: 630px; padding-inline: 28px; }
  .hero h1 { font-size: 48px; }
  .platform-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .product-section { grid-template-columns: 1fr; gap: 46px; padding-inline: 28px; }
  .product-copy { max-width: 720px; }
  .trust-section, .faq-section { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 640px) {
  .brand small { display: none; }
  .hero { min-height: 620px; padding: 72px 20px 52px; background-position: 34% center; }
  .hero-shade { background: rgba(14, 16, 20, .84); }
  .hero h1 { font-size: 40px; }
  .hero-copy { font-size: 15px; line-height: 1.8; }
  .hero-actions, .download-actions { display: grid; grid-template-columns: 1fr; }
  .hero-actions .primary-action, .hero-actions .secondary-action { width: 100%; }
  .hero-facts { display: grid; gap: 9px; margin-top: 28px; }
  .platform-section, .workflow-section, .faq-section { width: calc(100% - 36px); padding: 72px 0; }
  .section-heading h2, .product-copy h2, .trust-section h2, .download-section h2 { font-size: 28px; }
  .platform-grid { grid-template-columns: 1fr; }
  .platform-item { min-height: 0; padding: 20px; }
  .product-section { padding: 72px 18px; }
  .product-visual { overflow-x: auto; }
  .product-visual img { width: 760px; max-width: none; }
  .feature-list > div { grid-template-columns: 1fr; gap: 6px; }
  .workflow-list { grid-template-columns: 1fr; }
  .workflow-list li { min-height: 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .workflow-list li:last-child { border-bottom: 0; }
  .trust-section { padding: 68px 18px; }
  .trust-points p { grid-template-columns: 1fr; gap: 6px; }
  .faq-section { gap: 28px; }
  .download-section { display: grid; padding: 62px 18px; }
  .download-section .download-actions { width: 100%; }
  .site-footer { grid-template-columns: 1fr; padding: 38px 18px; }
  .site-footer nav { flex-wrap: wrap; gap: 14px 20px; }
  .site-footer > p { grid-column: 1; }
  .download-toast { left: 14px; right: 14px; bottom: 14px; }
}

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