:root {
  --ink: #17211c;
  --muted: #5f6d65;
  --paper: #f7f8f5;
  --surface: #ffffff;
  --line: #dbe1dc;
  --green: #176b4d;
  --green-dark: #0f4c38;
  --green-soft: #e8f2ed;
  --coral: #e9694b;
  --yellow: #f1c75b;
  --shadow: 0 18px 50px rgba(28, 48, 38, 0.1);
  --content: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0;
}

body.menu-open { overflow: hidden; }

a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 10px 14px;
  color: #fff;
  background: var(--green-dark);
}

.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(219, 225, 220, 0.9);
  background: rgba(247, 248, 245, 0.94);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  width: min(calc(100% - 40px), var(--content));
  height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 17px;
  font-weight: 700;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  color: #fff;
  background: var(--green);
  box-shadow: inset -6px -6px 0 rgba(0, 0, 0, 0.08);
}

.brand-mark::before {
  content: "";
  width: 13px;
  height: 16px;
  border: 3px solid currentColor;
  border-top: 0;
  transform: skewY(-20deg);
}

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a { padding: 8px 11px; border-radius: 6px; color: #435149; font-size: 14px; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--green-dark); background: var(--green-soft); }

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
}

.nav-toggle span { display: block; width: 18px; height: 2px; margin: 4px auto; background: var(--ink); }

.container { width: min(calc(100% - 40px), var(--content)); margin: 0 auto; }
.narrow { width: min(calc(100% - 40px), 820px); margin: 0 auto; }

.hero { padding: 70px 0 64px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 0.94fr) minmax(520px, 1.06fr); gap: 70px; align-items: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  color: var(--green-dark);
  font-size: 14px;
  font-weight: 700;
}

.eyebrow::before { content: ""; width: 24px; height: 2px; background: var(--coral); }

h1, h2, h3 { margin: 0; line-height: 1.22; letter-spacing: 0; }
h1 { max-width: 700px; font-size: clamp(40px, 5.2vw, 68px); }
h2 { font-size: clamp(28px, 3.4vw, 42px); }
h3 { font-size: 19px; }

.hero-copy { max-width: 610px; margin: 22px 0 0; color: var(--muted); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.button {
  min-height: 46px;
  padding: 11px 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--green);
  border-radius: 6px;
  color: #fff;
  background: var(--green);
  font-weight: 700;
  cursor: pointer;
}

.button:hover { background: var(--green-dark); }
.button-secondary { color: var(--green-dark); background: transparent; }
.button-secondary:hover { background: var(--green-soft); }

.trust-row { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 32px; color: var(--muted); font-size: 13px; }
.trust-row span { display: inline-flex; align-items: center; gap: 7px; }
.trust-row span::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--coral); }

.product-visual {
  position: relative;
  padding: 13px;
  border: 1px solid #d6ddd8;
  border-radius: 8px;
  background: #e9eeea;
  box-shadow: var(--shadow);
}

.product-visual::after {
  content: "只读数据 · 本地筛选";
  position: absolute;
  right: -18px;
  bottom: -18px;
  padding: 9px 13px;
  border-radius: 5px;
  color: #fff;
  background: var(--coral);
  font-size: 12px;
  font-weight: 700;
}

.app-window { overflow: hidden; border-radius: 5px; background: #fff; }
.app-bar { height: 38px; display: flex; align-items: center; gap: 6px; padding: 0 13px; border-bottom: 1px solid #edf0ed; background: #fbfcfb; }
.app-dot { width: 8px; height: 8px; border-radius: 50%; background: #ccd4cf; }
.app-dot:first-child { background: var(--coral); }
.app-dot:nth-child(2) { background: var(--yellow); }
.app-dot:nth-child(3) { background: #52a87b; }
.app-body { display: grid; grid-template-columns: 134px 1fr; min-height: 360px; }
.app-sidebar { padding: 18px 14px; color: #d9e9e0; background: #173f30; font-size: 11px; }
.app-title { margin-bottom: 22px; color: #fff; font-size: 13px; font-weight: 700; }
.app-nav-item { padding: 8px; margin-bottom: 5px; border-radius: 4px; }
.app-nav-item.active { color: #fff; background: rgba(255,255,255,.11); }
.app-main { min-width: 0; padding: 18px; }
.app-heading { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; font-size: 13px; font-weight: 700; }
.app-count { color: var(--green); font-size: 11px; }
.filters { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 7px; margin-bottom: 14px; }
.filter { height: 28px; padding: 6px 8px; border: 1px solid #dfe5e1; border-radius: 4px; color: #89948e; font-size: 9px; }
.video-list { display: grid; gap: 9px; }
.video-row { display: grid; grid-template-columns: 64px 1fr auto; gap: 10px; align-items: center; padding: 8px; border: 1px solid #e8ece9; border-radius: 5px; }
.thumb { height: 42px; border-radius: 3px; background: linear-gradient(135deg, #375a4a 0 50%, #e7b357 50%); }
.video-row:nth-child(2) .thumb { background: linear-gradient(135deg, #d66b54 0 45%, #f0d27d 45%); }
.video-row:nth-child(3) .thumb { background: linear-gradient(135deg, #457f70 0 40%, #cadbd3 40%); }
.video-name { height: 7px; width: 75%; margin-bottom: 7px; border-radius: 8px; background: #4c5c53; }
.video-meta { height: 5px; width: 48%; border-radius: 8px; background: #d8ded9; }
.score { min-width: 39px; padding: 3px 5px; border-radius: 3px; color: var(--green); background: var(--green-soft); font-size: 9px; text-align: center; }

.section { padding: 82px 0; }
.section-white { background: var(--surface); }
.section-dark { color: #fff; background: #173f30; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 40px; margin-bottom: 38px; }
.section-head p { max-width: 560px; margin: 0; color: var(--muted); }
.section-dark .section-head p { color: #c7d7cf; }

.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; border: 1px solid var(--line); background: var(--line); }
.feature-item { min-height: 230px; padding: 28px 24px; background: var(--surface); }
.feature-number { margin-bottom: 32px; color: var(--coral); font-size: 13px; font-weight: 700; }
.feature-item p { margin: 13px 0 0; color: var(--muted); font-size: 14px; }

.boundary-grid { display: grid; grid-template-columns: 0.92fr 1.08fr; gap: 70px; align-items: start; }
.boundary-list { display: grid; gap: 12px; }
.boundary-item { display: grid; grid-template-columns: 28px 1fr; gap: 12px; padding: 15px 0; border-bottom: 1px solid rgba(255,255,255,.14); }
.boundary-icon { width: 25px; height: 25px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.4); border-radius: 50%; color: var(--yellow); font-size: 13px; }
.boundary-item strong { display: block; margin-bottom: 3px; }
.boundary-item p { margin: 0; color: #c7d7cf; font-size: 14px; }

.flow { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 40px; }
.flow-step { position: relative; padding: 0 24px 0 0; }
.flow-step:not(:last-child)::after { content: ""; position: absolute; top: 17px; right: 16px; width: calc(100% - 62px); height: 1px; background: #c8d1cb; transform: translateX(100%); }
.flow-num { width: 35px; height: 35px; display: grid; place-items: center; margin-bottom: 17px; border-radius: 50%; color: #fff; background: var(--green); font-size: 13px; font-weight: 700; }
.flow-step p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }

.cta-band { padding: 54px 0; border-top: 5px solid var(--yellow); color: #fff; background: var(--green); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.cta-inner p { margin: 10px 0 0; color: #d7e8df; }
.cta-band .button { border-color: #fff; color: var(--green-dark); background: #fff; }

.page-hero { padding: 64px 0 52px; border-bottom: 1px solid var(--line); background: #eef2ee; }
.page-hero h1 { font-size: clamp(36px, 5vw, 56px); }
.page-hero p { max-width: 730px; margin: 18px 0 0; color: var(--muted); font-size: 18px; }
.meta-line { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 24px; color: var(--muted); font-size: 13px; }

.content-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 70px; padding: 64px 0 90px; }
.toc { position: sticky; top: 100px; align-self: start; }
.toc-title { margin: 0 0 12px; font-size: 13px; font-weight: 700; }
.toc a { display: block; padding: 7px 0; color: var(--muted); font-size: 13px; }
.toc a:hover { color: var(--green); }
.prose { min-width: 0; }
.prose section { scroll-margin-top: 100px; margin-bottom: 48px; }
.prose h2 { margin-bottom: 17px; font-size: 27px; }
.prose h3 { margin: 26px 0 9px; }
.prose p, .prose li { color: #4d5b53; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 8px 0; }
.notice { margin: 28px 0; padding: 18px 20px; border-left: 4px solid var(--coral); background: #fff2ee; }
.notice strong { color: var(--ink); }
.info-table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
.info-table th, .info-table td { padding: 13px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.info-table th { width: 25%; background: #edf2ee; }

.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.info-card { padding: 25px; border: 1px solid var(--line); border-radius: 7px; background: var(--surface); }
.info-card p { margin: 12px 0 0; color: var(--muted); }
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 48px; padding: 64px 0 90px; }
.contact-panel { padding: 28px; border: 1px solid var(--line); background: var(--surface); }
.contact-row { padding: 16px 0; border-bottom: 1px solid var(--line); }
.contact-row:last-child { border-bottom: 0; }
.contact-row small { display: block; color: var(--muted); }
.pending { display: inline-flex; margin-top: 6px; padding: 3px 8px; border-radius: 4px; color: #89501f; background: #fff0ce; font-size: 12px; }
.contact-form label { display: block; margin: 0 0 6px; font-size: 13px; font-weight: 700; }
.contact-form input, .contact-form textarea { width: 100%; margin-bottom: 17px; padding: 11px 12px; border: 1px solid #cfd8d2; border-radius: 5px; color: var(--ink); background: #fff; }
.contact-form textarea { min-height: 145px; resize: vertical; }
.form-note { margin-top: 12px; color: var(--muted); font-size: 12px; }
.form-status { min-height: 25px; margin-top: 12px; color: var(--green-dark); font-size: 13px; }

.site-footer { padding: 48px 0 22px; color: #dbe7e0; background: #102d22; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 50px; }
.footer-brand { color: #fff; }
.footer-copy { max-width: 440px; margin: 14px 0 0; color: #aebfb6; font-size: 14px; }
.footer-title { margin: 0 0 12px; color: #fff; font-size: 13px; font-weight: 700; }
.footer-links a { display: block; width: fit-content; padding: 4px 0; color: #b8c8c0; font-size: 13px; }
.footer-links a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; margin-top: 40px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); color: #91a69b; font-size: 12px; }
.footer-bottom::after { content: "粤ICP备2026115392号-1　公安备案号：办理中"; display: block; color: #91a69b; }

@media (max-width: 980px) {
  .nav-toggle { display: block; }
  .nav-links { position: fixed; inset: 72px 0 auto 0; max-height: 0; overflow: hidden; display: block; padding: 0 20px; background: var(--paper); transition: max-height .25s ease, padding .25s ease; }
  .menu-open .nav-links { max-height: calc(100vh - 72px); padding-top: 12px; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
  .nav-links a { display: block; padding: 12px; }
  .hero-grid { grid-template-columns: 1fr; gap: 45px; }
  .product-visual { width: min(100%, 690px); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .boundary-grid { grid-template-columns: 1fr; gap: 34px; }
  .content-layout { grid-template-columns: 1fr; gap: 20px; }
  .toc { position: static; display: flex; flex-wrap: wrap; gap: 4px 16px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
  .toc-title { width: 100%; }
}

@media (max-width: 700px) {
  .nav-wrap, .container, .narrow { width: min(calc(100% - 28px), var(--content)); }
  .hero { padding: 48px 0 50px; }
  h1 { font-size: 41px; }
  .hero-copy, .page-hero p { font-size: 16px; }
  .product-visual { padding: 8px; }
  .product-visual::after { right: 8px; bottom: -16px; }
  .app-body { grid-template-columns: 92px 1fr; min-height: 300px; }
  .app-sidebar { padding: 14px 8px; }
  .app-main { padding: 12px 9px; }
  .filters { grid-template-columns: 1fr 1fr; }
  .filters .filter:last-child { display: none; }
  .video-row { grid-template-columns: 48px 1fr; }
  .score { display: none; }
  .section { padding: 60px 0; }
  .section-head, .cta-inner { align-items: flex-start; flex-direction: column; }
  .feature-grid, .cards-3, .contact-grid { grid-template-columns: 1fr; }
  .feature-item { min-height: 190px; }
  .flow { grid-template-columns: 1fr; gap: 24px; }
  .flow-step { display: grid; grid-template-columns: 38px 1fr; column-gap: 14px; }
  .flow-step:not(:last-child)::after { top: 36px; left: 17px; width: 1px; height: calc(100% + 5px); transform: none; }
  .flow-num { grid-row: 1 / 3; }
  .flow-step p { margin-top: 5px; }
  .page-hero { padding: 48px 0 40px; }
  .content-layout, .contact-grid { padding: 45px 0 65px; }
  .info-table { display: block; overflow-x: auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > :first-child { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}