:root {
  --ink: #14212b;
  --muted: #5c6973;
  --line: #dce3e7;
  --paper: #ffffff;
  --soft: #f4f7f7;
  --teal: #087f8c;
  --teal-dark: #075c65;
  --coral: #e45745;
  --yellow: #f2c94c;
  --green: #26875f;
  --shadow: 0 18px 50px rgba(20, 33, 43, 0.12);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
}

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

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

button,
input {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  color: white;
  background: var(--ink);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 68px;
  border-bottom: 1px solid rgba(220, 227, 231, 0.9);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 760;
}

.brand-mark {
  display: grid;
  grid-template-columns: repeat(2, 8px);
  grid-template-rows: repeat(2, 8px);
  gap: 3px;
  width: 19px;
}

.brand-mark span {
  background: var(--teal);
}

.brand-mark span:nth-child(2) {
  background: var(--coral);
}

.brand-mark span:nth-child(3) {
  background: var(--yellow);
}

.brand-mark span:nth-child(4) {
  background: var(--ink);
}

.nav-links,
.nav-actions {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-links a,
.text-link {
  color: #33444f;
  font-size: 14px;
  font-weight: 620;
}

.nav-links a:hover,
.text-link:hover {
  color: var(--teal);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--line);
  background: white;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px 0;
  background: var(--ink);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 9px 18px;
  border: 1px solid var(--ink);
  border-radius: 5px;
  color: var(--ink);
  background: white;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}

.button:hover {
  border-color: var(--teal);
  color: var(--teal);
}

.button-primary {
  border-color: var(--teal);
  color: white;
  background: var(--teal);
}

.button-primary:hover {
  border-color: var(--teal-dark);
  color: white;
  background: var(--teal-dark);
}

.button-dark {
  border-color: var(--ink);
  color: white;
  background: var(--ink);
}

.hero {
  min-height: calc(100vh - 68px);
  padding: 64px 0 48px;
  overflow: hidden;
  background: var(--paper);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(560px, 1.15fr);
  gap: 58px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 760;
}

.eyebrow::before {
  width: 24px;
  height: 3px;
  background: var(--coral);
  content: "";
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 700px;
  margin-bottom: 22px;
  font-size: 58px;
  line-height: 1.1;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: 36px;
  line-height: 1.2;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.35;
}

.hero-lead {
  max-width: 620px;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.hero-note {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  color: var(--muted);
  font-size: 13px;
}

.hero-note span::before {
  margin-right: 7px;
  color: var(--green);
  content: "✓";
}

.product-shot {
  position: relative;
  margin-right: -9vw;
}

.product-shot::before {
  position: absolute;
  top: -18px;
  left: -18px;
  z-index: -1;
  width: 72%;
  height: 64%;
  background: var(--yellow);
  content: "";
}

.product-frame {
  overflow: hidden;
  border: 1px solid #c8d2d7;
  border-radius: 6px;
  background: #edf2f3;
  box-shadow: var(--shadow);
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 11px;
  border-bottom: 1px solid #d6dee2;
  background: #f7f9f9;
}

.window-bar span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #b9c4ca;
}

.window-bar span:first-child {
  background: var(--coral);
}

.product-frame img {
  width: 100%;
  min-height: 400px;
  object-fit: cover;
  object-position: top left;
}

.trust-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}

.trust-grid {
  display: grid;
  grid-template-columns: 1.1fr repeat(3, 1fr);
  min-height: 98px;
}

.trust-item {
  display: flex;
  align-items: center;
  padding: 20px 26px;
  border-left: 1px solid var(--line);
}

.trust-item:first-child {
  border-left: 0;
  color: var(--muted);
  font-size: 14px;
}

.trust-item strong {
  display: block;
  font-size: 16px;
}

.section {
  padding: 96px 0;
}

.section-soft {
  background: var(--soft);
}

.section-dark {
  color: white;
  background: var(--ink);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 48px;
}

.section-heading p {
  max-width: 520px;
  margin-bottom: 0;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.feature-item {
  min-height: 270px;
  padding: 30px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: white;
}

.feature-index {
  display: block;
  margin-bottom: 48px;
  color: var(--coral);
  font-size: 13px;
  font-weight: 800;
}

.feature-item p,
.step p,
.legal-copy p,
.prose p {
  color: var(--muted);
}

.feature-item a {
  display: inline-block;
  margin-top: 14px;
  color: var(--teal-dark);
  font-size: 14px;
  font-weight: 700;
}

.agent-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 72px;
  align-items: center;
}

.agent-list {
  display: grid;
  gap: 18px;
  margin: 30px 0 0;
}

.agent-list div {
  padding-left: 18px;
  border-left: 3px solid var(--teal);
}

.agent-list strong {
  display: block;
  margin-bottom: 2px;
}

.agent-list span {
  color: #bfcbd1;
  font-size: 14px;
}

.chat-demo {
  padding: 28px;
  border: 1px solid #40515d;
  border-radius: 6px;
  background: #1b2a34;
}

.chat-label {
  margin-bottom: 22px;
  color: #9fb0ba;
  font-size: 12px;
  font-weight: 700;
}

.bubble {
  max-width: 82%;
  margin-bottom: 16px;
  padding: 13px 16px;
  border-radius: 5px;
  font-size: 14px;
}

.bubble-user {
  margin-left: auto;
  color: var(--ink);
  background: var(--yellow);
}

.bubble-agent {
  border: 1px solid #41545f;
  color: white;
  background: #263943;
}

.mini-chart {
  display: flex;
  align-items: end;
  gap: 8px;
  height: 100px;
  margin-top: 16px;
  padding: 10px 10px 0;
  border-bottom: 1px solid #5b6d77;
}

.mini-chart span {
  flex: 1;
  background: var(--teal);
}

.mini-chart span:nth-child(2),
.mini-chart span:nth-child(5) {
  background: var(--coral);
}

.mini-chart span:nth-child(3) {
  background: var(--yellow);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.step-number {
  display: grid;
  width: 38px;
  height: 38px;
  margin-bottom: 22px;
  place-items: center;
  border: 1px solid var(--teal);
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 800;
}

.cta-band {
  padding: 74px 0;
  color: white;
  background: var(--teal-dark);
}

.cta-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 44px;
}

.cta-wrap h2 {
  max-width: 650px;
  margin-bottom: 8px;
}

.cta-wrap p {
  margin-bottom: 0;
  color: #c8e1e3;
}

.site-footer {
  padding: 54px 0 28px;
  color: #d5dde1;
  background: #0f1a22;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(4, 1fr);
  gap: 38px;
  padding-bottom: 42px;
}

.footer-brand p {
  max-width: 340px;
  margin-top: 16px;
  color: #95a4ad;
  font-size: 14px;
}

.footer-column strong {
  display: block;
  margin-bottom: 16px;
  color: white;
  font-size: 14px;
}

.footer-column a {
  display: block;
  margin: 9px 0;
  color: #aab7be;
  font-size: 13px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 22px;
  border-top: 1px solid #2b3942;
  color: #82929b;
  font-size: 12px;
}

.page-hero {
  padding: 78px 0 62px;
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}

.page-hero h1 {
  max-width: 850px;
  font-size: 48px;
}

.page-hero p {
  max-width: 700px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 18px;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  gap: 72px;
  align-items: start;
}

.contact-details {
  display: grid;
  gap: 38px;
}

.contact-item {
  padding-bottom: 38px;
  border-bottom: 1px solid var(--line);
}

.contact-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.contact-item h2,
.wechat-contact h2 {
  margin-bottom: 12px;
  font-size: 28px;
}

.contact-item p,
.wechat-contact p {
  color: var(--muted);
}

.contact-link {
  color: var(--teal);
  font-size: 20px;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.wechat-contact {
  padding-left: 48px;
  border-left: 1px solid var(--line);
}

.wechat-contact img {
  display: block;
  width: min(100%, 360px);
  height: auto;
  margin-top: 24px;
  background: white;
}

.content-grid {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 64px;
}

.side-nav {
  position: sticky;
  top: 98px;
  align-self: start;
}

.side-nav a {
  display: block;
  padding: 9px 0;
  color: var(--muted);
  font-size: 14px;
}

.side-nav a:hover {
  color: var(--teal);
}

.prose {
  max-width: 780px;
}

.prose h2 {
  margin-top: 52px;
  font-size: 30px;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose h3 {
  margin-top: 30px;
}

.prose ul,
.prose ol {
  padding-left: 22px;
}

.prose li {
  margin: 8px 0;
  color: var(--muted);
}

.callout {
  margin: 28px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--yellow);
  background: #fff9e8;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 420px));
  gap: 24px;
  justify-content: center;
}

.price-card {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: white;
}

.price-card-featured {
  border-top: 5px solid var(--teal);
}

.price {
  margin: 24px 0 8px;
  font-size: 36px;
  font-weight: 800;
}

.price-card ul {
  min-height: 190px;
  padding: 18px 0 0;
  list-style: none;
}

.price-card li {
  margin: 11px 0;
  color: var(--muted);
}

.price-card li::before {
  margin-right: 8px;
  color: var(--green);
  content: "✓";
}

.legal-copy {
  max-width: 820px;
  margin: 0 auto;
}

.legal-copy h2 {
  margin-top: 42px;
  font-size: 25px;
}

@media (max-width: 980px) {
  .hero-grid,
  .agent-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-grid {
    gap: 54px;
  }

  .product-shot {
    margin-right: -80px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .trust-item:nth-child(3) {
    border-left: 0;
  }

  .content-grid {
    grid-template-columns: 1fr;
  }

  .side-nav {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 6px 20px;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  .site-header,
  .nav-wrap {
    height: 60px;
    min-height: 60px;
  }

  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: absolute;
    top: 60px;
    right: 0;
    left: 0;
    display: none;
    padding: 20px;
    border-bottom: 1px solid var(--line);
    background: white;
  }

  .nav-menu.is-open {
    display: block;
  }

  .nav-links,
  .nav-actions {
    align-items: stretch;
    flex-direction: column;
    gap: 8px;
  }

  .nav-links a {
    padding: 9px 0;
  }

  .nav-actions {
    margin-top: 14px;
  }

  .hero {
    padding-top: 46px;
  }

  h1,
  .page-hero h1 {
    font-size: 40px;
  }

  h2 {
    font-size: 30px;
  }

  .product-shot {
    margin-right: -28px;
  }

  .product-frame img {
    min-height: 260px;
  }

  .trust-grid,
  .feature-grid,
  .steps,
  .pricing-grid,
  .footer-grid,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .wechat-contact {
    padding-top: 36px;
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .trust-item,
  .trust-item:nth-child(3) {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .trust-item:first-child {
    border-top: 0;
  }

  .section {
    padding: 70px 0;
  }

  .section-heading,
  .cta-wrap,
  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }

  .feature-item {
    min-height: auto;
  }

  .feature-index {
    margin-bottom: 28px;
  }

  .price-card ul {
    min-height: auto;
  }
}

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