:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --text: #111827;
  --muted: #526173;
  --border: #d8dee8;
  --primary: #005fd7;
  --primary-dark: #0047a6;
  --danger: #d92d20;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

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

.container {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #111827;
  font-weight: 700;
}

.brand-mark {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  overflow: hidden;
}

.brand-mark img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand-text {
  font-size: 16px;
}

.brand-lockup {
  display: inline-grid;
  justify-items: center;
  color: #111827;
  line-height: 1.05;
}

.brand-name-zh {
  position: relative;
  display: inline-block;
  width: max-content;
  font-size: 17px;
  font-weight: 800;
}

.brand-name-zh sup {
  position: absolute;
  top: -0.15em;
  right: -1.65em;
  font-size: 7px;
  font-weight: 700;
  line-height: 1;
}

.brand-name-en {
  margin-top: 3px;
  width: 100%;
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
  text-align: center;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 34px;
  color: var(--muted);
  font-size: 13px;
}

.nav-link {
  position: relative;
  padding: 24px 0 20px;
}

.nav-link.active {
  color: var(--primary);
  font-weight: 700;
}

.nav-link.active::after {
  position: absolute;
  right: 0;
  bottom: 14px;
  left: 0;
  height: 2px;
  background: var(--primary);
  content: "";
}

.header-contact,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 1px solid transparent;
  font-weight: 700;
  line-height: 1;
}

.header-contact {
  min-height: 36px;
  padding: 0 18px;
  border-radius: 3px;
  background: var(--primary);
  color: #ffffff;
  font-size: 13px;
}

.hero {
  background: var(--surface);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  align-items: center;
  gap: 76px;
  min-height: 520px;
  padding: 64px 0;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
}

.hero .eyebrow,
.section-heading .eyebrow {
  display: none;
}

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

h1 {
  margin-bottom: 18px;
  font-size: 38px;
  line-height: 1.18;
  letter-spacing: 0;
}

h1 span {
  color: var(--primary);
}

.hero h2 {
  max-width: 700px;
  margin-bottom: 22px;
  color: #1d2f46;
  font-size: 19px;
  line-height: 1.5;
}

.lead {
  max-width: 700px;
  margin-bottom: 32px;
  color: var(--muted);
  font-size: 15px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.button {
  min-width: 214px;
  min-height: 64px;
  padding: 0 28px;
  font-size: 14px;
}

.button.primary {
  background: var(--primary);
  color: #ffffff;
}

.button.primary::after {
  margin-left: 8px;
  content: "\2192";
}

.button.secondary {
  border-color: #8e98a8;
  background: #ffffff;
  color: #111827;
}

.hero-card {
  display: flex;
  min-height: 350px;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: #e8ebef;
}

.hero-card-inner {
  width: min(390px, calc(100% - 60px));
  min-height: 148px;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 16px;
  padding: 34px 36px;
  border: 1px solid #c9d1dc;
  border-radius: 4px;
  background: #ffffff;
  box-shadow: 0 10px 24px rgba(16, 24, 40, 0.05);
}

.icon-circle,
.feature-icon,
.notice-mark {
  display: inline-grid;
  place-items: center;
  color: var(--primary);
  font-weight: 800;
}

.icon-circle {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #e7f0ff;
}

.hero-card h3 {
  margin-bottom: 4px;
  font-size: 15px;
}

.hero-card p {
  margin-bottom: 18px;
  color: #607083;
  font-size: 12px;
}

.mock-lines {
  width: 100%;
}

.mock-lines span {
  display: block;
  height: 6px;
  margin-top: 12px;
  border-radius: 999px;
  background: #d8dde4;
}

.mock-lines span:first-child {
  width: min(210px, 100%);
}

.mock-lines span:nth-child(2) {
  width: min(150px, 80%);
}

.mock-lines span:nth-child(3) {
  width: min(180px, 90%);
}

.section,
.page-section {
  padding: 72px 0;
}

.section.muted,
.safety-section {
  background: #f1f3f6;
}

.section-heading {
  margin-bottom: 60px;
  text-align: center;
}

.section-heading h2,
.page-section h1 {
  position: relative;
  margin-bottom: 0;
  font-size: 26px;
  line-height: 1.3;
}

.section-heading h2::after {
  display: block;
  width: 44px;
  height: 3px;
  margin: 14px auto 0;
  background: var(--primary);
  content: "";
}

.section-heading.align-left {
  margin-bottom: 40px;
  text-align: left;
}

.section-heading.align-left h2::after {
  display: none;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.feature-card,
.use-case-card,
.notice-card,
.safety-card,
.placeholder-box,
.info-card {
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface);
}

.feature-card {
  min-height: 206px;
  padding: 24px;
}

.feature-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 24px;
  border-radius: 3px;
  background: #eaf2ff;
  font-size: 11px;
}

.feature-card h3 {
  margin-bottom: 12px;
  font-size: 18px;
}

.feature-card p,
.notice-card p,
.safety-card p,
.footer-brand p,
.footer-column a,
.content p,
.contact-list {
  color: var(--muted);
  font-size: 14px;
}

.use-case-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.use-case-card {
  display: flex;
  min-height: 88px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: #111827;
  font-weight: 700;
}

.use-case-icon {
  color: var(--primary);
  font-size: 20px;
  line-height: 1;
}

.notice-card {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 22px;
  padding: 32px;
  border-left: 4px solid var(--primary);
}

.notice-mark {
  color: var(--primary);
  font-size: 18px;
}

.notice-card h2,
.safety-card h2 {
  margin-bottom: 12px;
  font-size: 18px;
}

.notice-card p,
.safety-card p {
  margin-bottom: 0;
}

.safety-card {
  padding: 32px 36px;
  border-color: #d7dce4;
  background: #e5e7ea;
}

.safety-card h2::before {
  margin-right: 12px;
  color: var(--danger);
  content: "!";
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #eef1f5;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.75fr 1fr;
  gap: 80px;
  padding: 64px 0;
}

.footer-logo {
  margin-bottom: 16px;
}

.footer-column h2 {
  margin-bottom: 18px;
  font-size: 14px;
}

.footer-column ul {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  color: #6b7685;
  font-size: 12px;
}

.footer-bottom p {
  margin: 0;
}

.content {
  max-width: 860px;
}

.content h1 {
  margin-bottom: 18px;
  font-size: 34px;
}

.placeholder-box,
.info-card {
  padding: 28px;
}

.content .info-card {
  margin-top: 24px;
}

.content-list {
  margin: 14px 0 0;
  padding-left: 20px;
  color: #344256;
  font-size: 15px;
  line-height: 1.8;
}

.content-list li + li {
  margin-top: 8px;
}

.contact-note {
  margin-top: 32px;
}

.contact-list {
  display: grid;
  gap: 16px;
  margin: 28px 0 0;
}

.contact-list div {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.contact-list dt {
  color: #111827;
  font-weight: 700;
}

.contact-list dd {
  margin: 4px 0 0;
}

.legal-doc {
  max-width: 920px;
}

.legal-doc > .muted {
  margin-bottom: 28px;
  color: var(--muted);
}

.legal-body {
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface);
}

.legal-body h2 {
  margin: 30px 0 12px;
  font-size: 20px;
  line-height: 1.4;
}

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

.legal-body p {
  margin: 0 0 14px;
  color: #344256;
  font-size: 15px;
  line-height: 1.8;
}

@media (max-width: 860px) {
  .container {
    width: min(100% - 32px, 1120px);
  }

  .header-inner,
  .hero-grid,
  .feature-grid,
  .use-case-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .header-inner {
    gap: 12px;
    padding: 14px 0;
  }

  .nav {
    justify-content: flex-start;
    gap: 18px;
    overflow-x: auto;
  }

  .nav-link {
    padding: 8px 0;
    white-space: nowrap;
  }

  .nav-link.active::after {
    bottom: 0;
  }

  .header-contact {
    width: 100%;
  }

  .hero-grid {
    gap: 36px;
    min-height: auto;
    padding: 48px 0;
  }

  h1 {
    font-size: 32px;
  }

  .button {
    width: 100%;
  }

  .hero-card {
    min-height: 260px;
  }

  .hero-card-inner {
    width: min(390px, calc(100% - 32px));
    padding: 28px;
  }

  .legal-body {
    padding: 24px;
  }

  .section,
  .page-section {
    padding: 52px 0;
  }

  .section-heading {
    margin-bottom: 34px;
  }

  .footer-bottom {
    flex-direction: column;
  }
}