:root {
  --bg: #f5f7f4;
  --surface: #ffffff;
  --surface-soft: #eef3f1;
  --ink: #121615;
  --ink-2: #39423f;
  --muted: #6d7773;
  --line: rgba(18, 22, 21, 0.12);
  --line-strong: rgba(18, 22, 21, 0.22);
  --sage: #7fa99a;
  --cyan: #8bbfd0;
  --coral: #d88b72;
  --violet: #a8a3d7;
  --cream: #fffdf8;
  --shadow: 0 22px 70px rgba(33, 44, 40, 0.10);
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    linear-gradient(90deg, rgba(18, 22, 21, 0.035) 1px, transparent 1px),
    linear-gradient(rgba(18, 22, 21, 0.035) 1px, transparent 1px),
    var(--bg);
  background-size: 32px 32px;
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.7;
}

main {
  flex: 1 0 auto;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 247, 244, 0.88);
  backdrop-filter: blur(18px);
}

.header-inner {
  width: min(1180px, calc(100% - 32px));
  min-height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink);
}

.brand-logo {
  width: 38px;
  height: 38px;
  display: block;
}

.logo-frame {
  fill: var(--cream);
  stroke: rgba(18, 22, 21, 0.28);
  stroke-width: 1.2;
}

.logo-line {
  fill: none;
  stroke: rgba(18, 22, 21, 0.38);
  stroke-width: 1.35;
  stroke-linecap: round;
}

.logo-dot {
  stroke: rgba(18, 22, 21, 0.28);
  stroke-width: 1;
}

.logo-dot-a {
  fill: #e4f2f5;
}

.logo-dot-b {
  fill: #f6e5dd;
}

.logo-glyph {
  fill: var(--ink);
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 800;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.18;
}

.brand-name {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 750;
}

.brand-company {
  color: var(--muted);
  font-size: 0.72rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  background: var(--surface);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font-size: 1.1rem;
  line-height: 1;
}

.hero {
  position: relative;
  min-height: 560px;
  overflow: hidden;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(112deg, rgba(139, 191, 208, 0.22), transparent 46%),
    linear-gradient(18deg, rgba(216, 139, 114, 0.17), transparent 42%),
    var(--bg);
}

.hero-visual {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.rule-system {
  position: absolute;
  right: max(20px, calc((100vw - 1180px) / 2));
  top: 50%;
  width: min(560px, 42vw);
  height: 520px;
  transform: translateY(-50%);
  color: var(--ink);
  opacity: 0.86;
}

.rule-system svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.rule-system .rail {
  fill: none;
  stroke: rgba(18, 22, 21, 0.16);
  stroke-width: 1.2;
}

.rule-system .flow {
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-dasharray: 13 15;
  animation: ruleFlow 12s linear infinite;
}

.rule-system .flow.a { stroke: var(--cyan); }
.rule-system .flow.b { stroke: var(--coral); animation-duration: 15s; }
.rule-system .flow.c { stroke: var(--sage); animation-duration: 18s; }

.rule-system rect,
.rule-system circle {
  vector-effect: non-scaling-stroke;
}

.rule-system .frame {
  fill: rgba(255, 255, 255, 0.42);
  stroke: rgba(18, 22, 21, 0.18);
  stroke-width: 1;
}

.rule-system .node {
  fill: var(--surface);
  stroke: rgba(18, 22, 21, 0.28);
  stroke-width: 1.2;
}

.rule-system .node.cyan { fill: #e4f2f5; }
.rule-system .node.coral { fill: #f6e5dd; }
.rule-system .node.sage { fill: #e4eee9; }
.rule-system .node.violet { fill: #ebeafa; }

.rule-system .bar {
  fill: rgba(18, 22, 21, 0.55);
}

@keyframes ruleFlow {
  to {
    stroke-dashoffset: -112;
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 92px 0 112px;
}

.eyebrow,
.section-kicker,
.page-kicker {
  margin: 0 0 14px;
  color: var(--coral);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 620px;
  margin: 0;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 4.85rem;
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: 0;
}

.hero h1 span {
  display: block;
}

.hero-lead {
  max-width: 610px;
  margin: 26px 0 0;
  color: var(--ink-2);
  font-size: 1.14rem;
}

.hero-note {
  max-width: 580px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.hero-actions,
.card-actions,
.page-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 32px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  border-radius: 8px;
  background: var(--ink);
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: 0.94rem;
  font-weight: 800;
  cursor: pointer;
}

.button:hover {
  transform: translateY(-1px);
}

.button.secondary,
.button.light {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line-strong);
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 38px;
}

.fact-chip,
.tag {
  min-height: 30px;
  display: inline-flex;
  align-items: center;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.58);
  color: var(--ink-2);
  font-size: 0.82rem;
  font-weight: 760;
}

.section,
.page-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.section {
  padding: 74px 0;
}

.section-header {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(280px, 0.72fr);
  gap: 44px;
  align-items: end;
  margin-bottom: 30px;
}

.section h2,
.page-title {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 2.72rem;
  line-height: 1.14;
  letter-spacing: 0;
}

.section-summary,
.page-summary {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

.principle-board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  background: var(--line);
}

.home-summary {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.88fr) minmax(0, 0.88fr);
  gap: 1px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--line);
}

.home-product {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 520px);
  gap: 36px;
  align-items: center;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.home-product h3 {
  margin: 0 0 12px;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 2.18rem;
  line-height: 1.15;
}

.home-product p {
  margin: 0;
  color: var(--muted);
}

.product-screens {
  justify-self: end;
  width: min(100%, 500px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: 14px;
}

.product-screen {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  box-shadow: 0 18px 46px rgba(33, 44, 40, 0.10);
}

.product-screen:nth-child(2) {
  margin-top: 28px;
}

.product-screen img {
  width: 100%;
  height: auto;
  display: block;
}

.focus-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.focus-item {
  min-height: 180px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.62);
}

.focus-item span {
  display: block;
  margin-bottom: 28px;
  color: var(--muted);
  font-family: var(--font-serif);
  font-size: 1.28rem;
}

.focus-item h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 1.04rem;
}

.focus-item p {
  margin: 0;
  color: var(--muted);
}

.company-info {
  border-top: 1px solid var(--line);
}

.info-row {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.info-label {
  color: var(--muted);
  font-weight: 760;
}

.info-value {
  color: var(--ink);
}

.contact-band {
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(100deg, rgba(139, 191, 208, 0.15), transparent 42%),
    var(--surface);
}

.contact-band h2 {
  margin-bottom: 12px;
}

.contact-band p {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
}

.summary-item {
  min-height: 180px;
  padding: 28px 30px;
  background: rgba(255, 255, 255, 0.58);
}

.summary-item h2 {
  margin: 0 0 14px;
  color: var(--ink);
  font-size: 1.02rem;
  line-height: 1.45;
}

.summary-item p {
  margin: 0;
  color: var(--muted);
}

.text-link {
  display: inline-flex;
  margin-top: 18px;
  color: var(--ink);
  font-weight: 850;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.principle-item {
  min-height: 190px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.62);
}

.principle-item .index {
  display: block;
  margin-bottom: 34px;
  color: var(--muted);
  font-family: var(--font-serif);
  font-size: 1.45rem;
}

.principle-item h3,
.contact-card h2,
.legal-section h2 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 1.02rem;
  line-height: 1.45;
}

.principle-item p,
.product-card p,
.contact-card p,
.legal-note p,
.content-block p,
.legal-section p,
.legal-section li {
  margin: 0;
  color: var(--muted);
}

.method-section {
  background:
    linear-gradient(100deg, rgba(127, 169, 154, 0.12), transparent 42%),
    var(--bg);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.method-section .section {
  padding-top: 82px;
  padding-bottom: 82px;
}

.method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.method-cell {
  min-height: 220px;
  padding: 28px;
  background: var(--cream);
}

.method-cell strong {
  display: block;
  margin-bottom: 18px;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.35rem;
}

.method-cell p {
  margin: 0;
  color: var(--muted);
}

.method-rule {
  height: 74px;
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr 48px 1fr 48px 1fr;
  align-items: center;
  gap: 8px;
}

.method-rule span {
  height: 1px;
  background: var(--line-strong);
}

.method-rule i {
  height: 28px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--surface);
}

.product-band {
  background:
    linear-gradient(100deg, rgba(127, 169, 154, 0.16), transparent 40%),
    var(--bg);
}

.product-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.product-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 520px);
  gap: 28px;
  align-items: center;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.product-card.text-only {
  grid-template-columns: 1fr;
}

.product-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.product-card h2,
.product-card h3 {
  margin: 0 0 12px;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 2rem;
  line-height: 1.18;
}

.trust-row {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) repeat(2, minmax(0, 0.8fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.trust-cell {
  min-height: 132px;
  padding: 22px;
  background: var(--surface);
}

.trust-cell span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 820;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.trust-cell strong {
  display: block;
  margin-top: 10px;
  color: var(--ink);
  font-size: 1.15rem;
}

.trust-cell p {
  margin: 10px 0 0;
  color: var(--muted);
}

.page-hero {
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(104deg, rgba(139, 191, 208, 0.18), transparent 38%),
    var(--bg);
}

.page-shell {
  padding: 76px 0 58px;
}

.page-summary {
  max-width: 760px;
  margin-top: 16px;
}

.page-panel {
  width: min(900px, calc(100% - 32px));
  margin: 0 auto;
  padding: 62px 0 80px;
}

.page-panel.wide {
  width: min(1180px, calc(100% - 32px));
}

.content-block {
  display: grid;
  gap: 16px;
  max-width: 800px;
}

.fact-list {
  margin-top: 34px;
  border-top: 1px solid var(--line);
}

.fact-row {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.fact-label {
  color: var(--muted);
  font-weight: 750;
}

.fact-value {
  color: var(--ink);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.contact-card,
.legal-note {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.contact-email {
  color: var(--ink);
  font-weight: 850;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.contact-support {
  width: 100%;
  padding-bottom: 0;
}

.legal-layout {
  display: grid;
  gap: 28px;
}

.legal-note strong {
  color: var(--ink);
}

.legal-section {
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.legal-section:last-child {
  border-bottom: 0;
}

.legal-section p {
  margin-bottom: 12px;
}

.legal-section ul {
  margin: 0;
  padding-left: 1.2rem;
}

.legal-section li + li {
  margin-top: 8px;
}

.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  background: var(--ink);
  color: rgba(255, 255, 255, 0.66);
}

.footer-inner {
  width: min(1180px, calc(100% - 32px));
  min-height: 92px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px 18px;
}

.footer-links a:hover {
  color: #fff;
}

.footer-muted {
  color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 980px) {
  .hero h1 {
    font-size: 3.65rem;
  }

  .rule-system {
    right: -110px;
    width: 520px;
    opacity: 0.42;
  }

  .section-header,
  .method-grid,
  .home-summary,
  .home-product,
  .focus-grid,
  .product-card,
  .trust-row {
    grid-template-columns: 1fr;
  }

  .product-screens {
    justify-self: start;
  }
}

@media (max-width: 780px) {
  .header-inner {
    min-height: 60px;
  }

  .brand-company {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .nav-link {
    justify-content: center;
  }

  .hero {
    min-height: auto;
  }

  .hero-content {
    padding: 96px 0 80px;
  }

  .hero h1 {
    font-size: 2.48rem;
  }

  .hero-lead {
    font-size: 1rem;
  }

  .rule-system {
    right: -280px;
    top: 58%;
    width: 620px;
    opacity: 0.26;
  }

  .section {
    padding: 54px 0;
  }

  .section h2,
  .page-title {
    font-size: 2rem;
  }

  .principle-board,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .product-card {
    padding: 20px;
  }

  .home-product {
    padding: 20px;
  }

  .product-screen:nth-child(2) {
    margin-top: 18px;
  }

  .page-panel,
  .page-panel.wide {
    width: min(100% - 32px, 1180px);
    padding: 46px 0 62px;
  }

  .fact-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .info-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 22px 0;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 420px) {
  .hero h1 {
    font-size: 2.04rem;
  }

  .hero-actions .button {
    width: 100%;
  }

  .product-screens {
    width: min(100%, 260px);
    grid-template-columns: 1fr;
    justify-self: center;
    gap: 12px;
  }

  .product-screen:nth-child(2) {
    margin-top: 0;
  }
}