:root {
  --color-navy: #14213d;
  --color-blue: #2563eb;
  --color-coral: #ff6b5f;
  --color-bg: #ffffff;
  --color-bg-soft: #f7f9fc;
  --color-text: #22304d;
  --color-text-muted: #526079;
  --color-line: #dce3ed;
  --shadow-soft: 0 20px 60px rgba(20, 33, 61, 0.08);
  --shadow-card: 0 16px 36px rgba(20, 33, 61, 0.08);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --container: min(1160px, calc(100% - 40px));
  --transition: 220ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.section {
  padding: 104px 0;
}

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

#contact.section {
  padding-top: 36px;
  padding-bottom: 36px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--color-blue);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 44px;
}

.section-heading h2 {
  margin: 0 0 16px;
  color: var(--color-navy);
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.18;
}

.section-heading p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(220, 227, 237, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 82px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-icon {
  width: 40px;
  height: 40px;
  object-fit: contain;
  flex: none;
}

.brand-text {
  color: var(--color-navy);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.35;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  position: relative;
  color: var(--color-text-muted);
  font-size: 0.98rem;
  transition: color var(--transition);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -10px;
  width: 100%;
  height: 2px;
  background: var(--color-blue);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-navy);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  border: 1px solid var(--color-line);
  border-radius: 12px;
  background: #fff;
  padding: 10px;
}

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

.hero {
  position: relative;
  overflow: hidden;
  padding-top: 84px;
  background:
    radial-gradient(circle at 18% 12%, rgba(37, 99, 235, 0.08), transparent 28%),
    radial-gradient(circle at 84% 22%, rgba(255, 107, 95, 0.08), transparent 18%),
    linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 44px;
  align-items: center;
}

.hero h1 {
  margin: 0;
  color: var(--color-navy);
  font-size: clamp(2.8rem, 5vw, 4.8rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
}

.hero-lead {
  margin: 24px 0 0;
  color: var(--color-navy);
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  font-weight: 600;
}

.hero-description {
  max-width: 680px;
  margin: 20px 0 0;
  color: var(--color-text-muted);
  font-size: 1.04rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    background var(--transition);
}

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

.button-primary {
  color: #fff;
  background: var(--color-blue);
  box-shadow: 0 14px 32px rgba(37, 99, 235, 0.22);
}

.button-secondary {
  color: var(--color-navy);
  background: #fff;
  border-color: var(--color-line);
}

.hero-card {
  position: relative;
  min-height: 560px;
  padding: 34px;
  border: 1px solid rgba(220, 227, 237, 0.85);
  border-radius: 32px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(247, 249, 252, 0.96) 100%);
  box-shadow: var(--shadow-soft);
}

.hero-lines {
  position: relative;
  min-height: 250px;
  border-radius: 26px;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(20, 33, 61, 0.04)),
    #fff;
  overflow: hidden;
}

.hero-lines::before,
.hero-lines::after {
  content: "";
  position: absolute;
  border-radius: 999px;
}

.hero-lines::before {
  inset: 24px 24px auto auto;
  width: 108px;
  height: 108px;
  border: 1px solid rgba(37, 99, 235, 0.12);
}

.hero-lines::after {
  left: 26px;
  bottom: 30px;
  width: 220px;
  height: 220px;
  border: 1px dashed rgba(20, 33, 61, 0.12);
}

.hero-node,
.hero-arrow {
  position: absolute;
}

.hero-node {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-blue);
  box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.08);
}

.hero-node-a {
  left: 58px;
  bottom: 60px;
}

.hero-node-b {
  left: 112px;
  bottom: 88px;
}

.hero-node-c {
  left: 146px;
  bottom: 42px;
}

.hero-node-d {
  top: 42px;
  right: 48px;
  background: var(--color-coral);
  box-shadow: 0 0 0 8px rgba(255, 107, 95, 0.1);
}

.hero-arrow {
  left: 104px;
  bottom: 86px;
  width: 180px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-navy), var(--color-blue));
  transform: rotate(-24deg);
  border-radius: 999px;
}

.hero-arrow::before,
.hero-arrow::after {
  content: "";
  position: absolute;
}

.hero-arrow::before {
  left: -42px;
  top: -28px;
  width: 74px;
  height: 74px;
  border-left: 3px solid rgba(20, 33, 61, 0.2);
  border-bottom: 3px solid rgba(20, 33, 61, 0.2);
  border-radius: 0 0 0 22px;
  transform: rotate(10deg);
}

.hero-arrow::after {
  right: -10px;
  top: -7px;
  border-style: solid;
  border-width: 9px 0 9px 18px;
  border-color: transparent transparent transparent var(--color-blue);
}

.hero-panel {
  margin-top: 22px;
  padding: 24px;
  border-radius: 24px;
  background: var(--color-navy);
  color: #fff;
}

.panel-title {
  margin: 0 0 14px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
}

.panel-list {
  margin: 0;
  padding-left: 20px;
}

.panel-list li + li {
  margin-top: 10px;
}

.value-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 20px;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 107, 95, 0.08);
  color: var(--color-navy);
  font-size: 0.94rem;
  font-weight: 700;
}

.value-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-coral);
  flex: none;
}

.trust-strip {
  padding: 0 0 24px;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: -30px;
}

.trust-grid > div {
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-card);
}

.trust-label {
  display: block;
  margin-bottom: 10px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.trust-grid strong {
  color: var(--color-navy);
  font-size: 1.15rem;
}

.about-grid,
.method-grid,
.product-overview,
.metric-grid,
.contact-cards {
  display: grid;
  gap: 22px;
}

.about-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.info-card,
.method-card,
.product-card,
.metric-card,
.contact-card,
.product-detail,
.steps-card,
.quote-card {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-card);
}

.info-card,
.method-card,
.product-card,
.metric-card,
.contact-card {
  padding: 28px;
}

.info-card h3,
.method-card h3,
.product-card h3,
.contact-card h3 {
  margin: 0 0 12px;
  color: var(--color-navy);
}

.info-card p,
.method-card p,
.product-card p,
.metric-card span,
.contact-card p {
  margin: 0;
  color: var(--color-text-muted);
}

.method-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 22px;
}

.method-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 249, 252, 0.98));
}

.method-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  height: 36px;
  margin-bottom: 16px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-blue);
  font-size: 0.92rem;
  font-weight: 700;
}

.product-overview {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 22px;
}

.product-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.product-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.product-avatar {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  object-fit: cover;
}

.product-badge {
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-blue);
  font-size: 0.88rem;
  font-weight: 700;
}

.tag-list,
.feature-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-list li {
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--color-bg-soft);
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-blue);
  font-weight: 700;
}

.text-link::after {
  content: "→";
}

.metric-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 22px;
}

.metric-card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--color-blue);
  font-size: 1.45rem;
}

.product-detail {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.88fr);
  gap: 28px;
  margin-top: 28px;
  padding: 32px;
}

.product-detail-contrast {
  background:
    linear-gradient(180deg, rgba(20, 33, 61, 0.98), rgba(31, 48, 83, 0.98));
  border-color: rgba(255, 255, 255, 0.08);
}

.product-detail-contrast .detail-copy,
.product-detail-contrast .detail-copy h3,
.product-detail-contrast .detail-columns h4,
.product-detail-contrast .steps-card h4,
.product-detail-contrast .quote-card h4,
.product-detail-contrast .detail-lead,
.product-detail-contrast .feature-list li,
.product-detail-contrast .search-entry,
.product-detail-contrast .quote-card p {
  color: #fff;
}

.product-detail-contrast .eyebrow {
  color: #8ab0ff;
}

.product-detail-contrast .detail-copy > p:not(.eyebrow):not(.detail-lead) {
  color: rgba(255, 255, 255, 0.74);
}

.product-detail-contrast .detail-columns h4 {
  color: rgba(255, 255, 255, 0.62);
}

.product-detail-contrast .search-entry {
  background: rgba(255, 107, 95, 0.12);
}

.detail-copy h3 {
  margin: 0;
  color: var(--color-navy);
  font-size: clamp(1.9rem, 2.4vw, 2.6rem);
}

.detail-lead {
  margin: 16px 0 0;
  color: var(--color-navy);
  font-size: 1.18rem;
  font-weight: 700;
}

.detail-copy > p:last-of-type {
  margin-bottom: 0;
}

.detail-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 26px;
}

.detail-columns h4,
.steps-card h4,
.quote-card h4 {
  margin: 0 0 12px;
  color: var(--color-navy);
}

.feature-list li {
  position: relative;
  padding-left: 18px;
  color: var(--color-text-muted);
}

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

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-coral);
  transform: translateY(-50%);
}

.steps-card,
.quote-card {
  margin-top: 22px;
  padding: 22px;
}

.steps-card ol {
  margin: 0;
  padding-left: 18px;
  color: var(--color-text-muted);
}

.steps-card li + li {
  margin-top: 10px;
}

.quote-card p {
  margin: 0;
  color: var(--color-text-muted);
}

.quote-card p + p {
  margin-top: 10px;
}

.detail-actions {
  margin-top: 24px;
}

.search-entry {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 999px;
  background: rgba(255, 107, 95, 0.08);
  color: var(--color-navy);
  font-weight: 700;
}

.detail-media {
  display: grid;
  gap: 16px;
}

.media-stack {
  display: grid;
  gap: 14px;
}

.media-stack img {
  width: 100%;
  height: auto;
  border-radius: 20px;
  border: 1px solid rgba(220, 227, 237, 0.8);
}

.media-stack-cc img {
  border-color: rgba(255, 255, 255, 0.08);
}

.qr-card {
  display: grid;
  place-items: center;
  gap: 12px;
  padding: 22px;
  border: 1px solid var(--color-line);
  border-radius: 20px;
  background: #fff;
  text-align: center;
}

.qr-card img {
  width: 132px;
  height: 132px;
  border-radius: 18px;
}

.qr-card p {
  margin: 0;
  color: var(--color-text-muted);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  align-items: stretch;
}

.contact-main {
  display: grid;
  align-items: center;
  height: 100%;
}

.contact-showcase {
  display: grid;
  place-items: center;
  padding: 12px;
  border: 1px solid var(--color-line);
  border-radius: 20px;
  background: #ffffff;
  box-shadow: var(--shadow-card);
}

.contact-showcase-image {
  width: 100%;
  height: auto;
  max-width: 560px;
}

.contact-main .section-heading {
  max-width: none;
  margin-bottom: 0;
}

.contact-main .section-heading h2 {
  margin: 0 0 8px;
  font-size: clamp(1.2rem, 1.5vw, 1.7rem);
}

.contact-main .section-heading p {
  font-size: 0.88rem;
}

.contact-mail {
  display: inline-flex;
  margin-top: 10px;
  color: var(--color-blue);
  font-size: 0.88rem;
  font-weight: 700;
  white-space: nowrap;
}

.site-footer {
  padding: 26px 0;
  background: var(--color-navy);
  color: #fff;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #ffffff;
}

.footer-brand-icon-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: #ffffff;
  flex: none;
}

.footer-brand-icon {
  width: 30px;
  height: 30px;
  object-fit: contain;
}

.footer-brand-text {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-meta {
  color: rgba(255, 255, 255, 0.72);
}

.footer-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px 18px;
  font-size: 0.95rem;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 500ms ease,
    transform 500ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .section {
    padding: 84px 0;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 12px);
    right: 20px;
    left: 20px;
    display: grid;
    gap: 2px;
    padding: 12px;
    border: 1px solid var(--color-line);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-card);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition:
      opacity var(--transition),
      transform var(--transition),
      visibility var(--transition);
  }

  .site-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav a {
    padding: 12px 14px;
    border-radius: 12px;
  }

  .site-nav a:hover,
  .site-nav a:focus-visible {
    background: var(--color-bg-soft);
  }

  .site-nav a::after {
    display: none;
  }

  .hero-grid,
  .product-detail,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .trust-grid,
  .about-grid,
  .method-grid,
  .metric-grid,
  .contact-cards {
    grid-template-columns: 1fr;
  }

  .product-overview,
  .detail-columns {
    grid-template-columns: 1fr;
  }

  .contact-main {
    order: 1;
  }

  .contact-cards {
    order: 2;
  }

  .hero-card {
    min-height: auto;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-brand-text {
    font-size: 0.92rem;
  }

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

@media (max-width: 640px) {
  :root {
    --container: min(100% - 28px, 1160px);
  }

  .section {
    padding: 74px 0;
  }

  #contact.section {
    padding-top: 28px;
    padding-bottom: 28px;
  }

  .header-inner {
    min-height: 76px;
  }

  .brand-icon {
    width: 34px;
    height: 34px;
  }

  .brand-text {
    font-size: 0.9rem;
  }

  .hero {
    padding-top: 56px;
  }

  .contact-heading-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero-card,
  .product-detail {
    padding: 22px;
  }

  .info-card,
  .method-card,
  .product-card,
  .metric-card,
  .contact-card {
    padding: 22px;
  }

  .hero-lines {
    min-height: 210px;
  }

  .hero-arrow {
    width: 140px;
  }

  .product-card-top {
    align-items: flex-start;
    flex-direction: column;
  }

  .contact-card img,
  .qr-card img {
    width: 120px;
    height: 120px;
  }
}