:root {
  --bg: #f6fbfc;
  --bg-alt: #eef8f7;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: #ffffff;
  --surface-soft: #f3fbfb;
  --line: rgba(18, 54, 74, 0.09);
  --line-strong: rgba(18, 54, 74, 0.14);
  --text: #163342;
  --muted: #6b8490;
  --accent: #109198;
  --accent-deep: #0b747a;
  --accent-soft: #def4f4;
  --sky: #eaf5ff;
  --shadow: 0 18px 48px rgba(17, 55, 77, 0.08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 18px;
  --container: min(1160px, calc(100vw - 48px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(189, 234, 235, 0.72), transparent 26%),
    radial-gradient(circle at 92% 7%, rgba(219, 240, 255, 0.92), transparent 22%),
    linear-gradient(180deg, #fbfeff 0%, #f6fbfc 48%, #eff8f8 100%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 10% 15%, rgba(255, 255, 255, 0.92), transparent 22%),
    radial-gradient(circle at 90% 80%, rgba(193, 238, 239, 0.32), transparent 24%);
  opacity: 0.92;
}

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

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

.page-shell {
  position: relative;
  overflow: clip;
}

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

.site-header {
  position: sticky;
  top: 18px;
  z-index: 20;
  width: var(--container);
  margin: 20px auto 0;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border: 1px solid rgba(255, 255, 255, 0.66);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(16px);
  box-shadow: 0 14px 36px rgba(17, 55, 77, 0.06);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), #45bcc2);
  color: white;
  font-weight: 800;
  letter-spacing: 0.04em;
  box-shadow: 0 12px 28px rgba(16, 145, 152, 0.2);
}

.brand-text {
  display: grid;
  gap: 2px;
}

.brand-text strong {
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.brand-text small {
  color: var(--muted);
  font-size: 0.73rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: inline-flex;
  align-items: center;
  gap: 18px;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
}

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

.nav-cta {
  padding: 10px 16px;
  border-radius: 999px;
  color: white !important;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  box-shadow: 0 12px 28px rgba(16, 145, 152, 0.18);
}

.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(16, 145, 152, 0.1);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: var(--text);
  transition: transform 180ms ease, opacity 180ms ease;
}

.hero {
  padding: 96px 0 56px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.9fr);
  gap: 28px;
  align-items: stretch;
}

.hero-copy,
.hero-panel,
.trust-strip,
.info-card,
.about-copy,
.about-metrics article,
.reasons-grid article,
.timeline article,
.testimonials article,
.faq-item,
.cta-card {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-copy {
  position: relative;
  padding: 44px;
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(248, 252, 252, 0.94)),
    radial-gradient(circle at top left, rgba(223, 244, 244, 0.92), transparent 34%);
}

.hero-copy::after {
  content: "";
  position: absolute;
  right: 40px;
  top: 28px;
  width: 132px;
  height: 132px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.9), rgba(191, 233, 235, 0.56));
  filter: blur(4px);
  opacity: 0.9;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.76rem;
  font-weight: 700;
}

.hero h1,
.section-heading h2,
.about-copy h2,
.cta-card h2 {
  margin: 0;
  line-height: 1.06;
  letter-spacing: -0.035em;
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", sans-serif;
  font-weight: 750;
}

.hero h1 {
  position: relative;
  z-index: 1;
  max-width: 10.8ch;
  font-size: clamp(2.9rem, 6vw, 5.15rem);
}

.hero-lead,
.section-heading p,
.about-copy p,
.about-copy blockquote,
.info-card p,
.reasons-grid p,
.timeline p,
.testimonials p,
.faq-answer p,
.cta-card p,
.trust-strip p {
  color: var(--muted);
  line-height: 1.82;
}

.hero-lead {
  position: relative;
  z-index: 1;
  margin: 22px 0 0;
  max-width: 58ch;
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
}

.button-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: white;
  box-shadow: 0 16px 30px rgba(16, 145, 152, 0.2);
}

.button-secondary {
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.hero-stats article {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(18, 54, 74, 0.08);
}

.hero-stats strong {
  display: block;
  font-size: clamp(1.85rem, 3vw, 2.7rem);
  letter-spacing: -0.03em;
}

.hero-stats span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.hero-panel {
  padding: 24px;
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(252, 255, 255, 0.96), rgba(242, 250, 250, 0.92)),
    radial-gradient(circle at top right, rgba(222, 244, 244, 0.88), transparent 28%);
}

.panel-card {
  padding: 22px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(18, 54, 74, 0.08);
}

.panel-card p,
.panel-card span {
  margin: 0;
  color: var(--muted);
}

.panel-card strong {
  display: block;
  margin: 10px 0 8px;
  font-size: 1.24rem;
  line-height: 1.36;
}

.panel-card-top {
  min-height: 228px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(239, 250, 249, 0.88)),
    radial-gradient(circle at top right, rgba(234, 245, 255, 0.84), transparent 36%);
}

.panel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.panel-highlight {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(222, 244, 244, 0.92), rgba(234, 245, 255, 0.9));
}

.trust-strip {
  margin-top: 8px;
  padding: 18px 24px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.8);
}

.trust-strip p {
  margin: 0 0 14px;
  font-weight: 600;
}

.trust-items {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.trust-items span {
  padding: 14px 16px;
  border-radius: 999px;
  background: var(--surface-strong);
  border: 1px solid rgba(18, 54, 74, 0.08);
  text-align: center;
  color: var(--muted);
}

.advantages,
.about,
.reasons,
.process,
.testimonials,
.faq,
.cta {
  padding: 90px 0 0;
}

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

.section-heading h2,
.about-copy h2,
.cta-card h2 {
  font-size: clamp(2rem, 4vw, 3.45rem);
}

.cards-grid,
.reasons-grid,
.timeline,
.testimonial-grid {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

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

.info-card {
  padding: 26px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(247, 252, 252, 0.92));
}

.card-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
}

.info-card h3,
.reasons-grid h3,
.timeline h3 {
  margin: 20px 0 12px;
  font-size: 1.28rem;
  letter-spacing: -0.02em;
}

.about {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.9fr);
  gap: 22px;
  align-items: stretch;
}

.about-copy,
.about-metrics article {
  padding: 30px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.84);
}

.about-copy blockquote {
  margin: 26px 0 0;
  padding: 22px 24px;
  border-left: 3px solid var(--accent);
  border-radius: 0 18px 18px 0;
  background: linear-gradient(135deg, rgba(222, 244, 244, 0.68), rgba(234, 245, 255, 0.78));
}

.about-metrics {
  display: grid;
  gap: 16px;
}

.about-metrics strong {
  display: block;
  font-size: 1.7rem;
  letter-spacing: -0.03em;
}

.about-metrics span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.7;
}

.reasons-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.reasons-grid article,
.timeline article,
.testimonials article {
  padding: 24px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.84);
}

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

.timeline span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 12px;
  border-radius: 999px;
  background: rgba(16, 145, 152, 0.1);
  color: var(--accent-deep);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.testimonials strong {
  display: block;
  margin-top: 18px;
  color: var(--accent-deep);
}

.faq-list {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.faq-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.84);
}

.faq-question {
  width: 100%;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 0;
  background: transparent;
  text-align: left;
  font-weight: 700;
  color: var(--text);
}

.faq-icon {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(16, 145, 152, 0.1);
  color: var(--accent-deep);
  font-size: 1.3rem;
}

.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 220ms ease;
}

.faq-answer p {
  margin: 0;
  overflow: hidden;
  padding: 0 24px 0;
}

.faq-item.is-open .faq-answer {
  grid-template-rows: 1fr;
}

.faq-item.is-open .faq-answer p {
  padding-bottom: 24px;
}

.faq-item.is-open .faq-icon {
  background: var(--accent);
  color: white;
}

.cta {
  padding-bottom: 80px;
}

.cta-card {
  padding: 34px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.94), rgba(238, 248, 247, 0.96)),
    radial-gradient(circle at top left, rgba(234, 245, 255, 0.92), transparent 34%);
}

.site-footer {
  width: var(--container);
  margin: 0 auto;
  padding: 0 0 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 0.92rem;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 480ms ease, transform 480ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 1080px) {
  .hero,
  .about,
  .cards-grid,
  .timeline,
  .testimonial-grid {
    grid-template-columns: 1fr;
  }

  .trust-items,
  .reasons-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-panel {
    order: -1;
  }

  .cta-card,
  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 760px) {
  :root {
    --container: min(100vw - 24px, 100%);
  }

  .site-header {
    top: 12px;
    padding: 12px 14px;
    border-radius: 26px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    left: 12px;
    right: 12px;
    top: calc(100% + 10px);
    padding: 14px;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .site-header.menu-open .site-nav {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-header.menu-open .nav-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .site-header.menu-open .nav-toggle span:nth-child(2) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero {
    padding-top: 74px;
  }

  .hero-copy,
  .hero-panel,
  .about-copy,
  .about-metrics article,
  .info-card,
  .reasons-grid article,
  .timeline article,
  .testimonials article,
  .faq-question,
  .cta-card {
    padding-left: 20px;
    padding-right: 20px;
  }

  .hero h1 {
    max-width: 100%;
  }

  .hero-stats,
  .panel-grid,
  .trust-items,
  .reasons-grid,
  .testimonial-grid {
    grid-template-columns: 1fr;
  }

  .faq-question {
    font-size: 0.98rem;
  }
}