:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --bg-soft: #f1f4f7;
  --surface: #ffffff;
  --surface-strong: #ffffff;
  --text: #1f2937;
  --text-soft: #6b7280;
  --primary: #1d4ed8;
  --primary-deep: #1e3a8a;
  --primary-soft: #eff6ff;
  --border: #e5e7eb;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.05);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --container: min(1120px, calc(100vw - 48px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

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

button,
a {
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 248, 250, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner,
.footer-inner,
.hero-grid,
.advantages-layout,
.contact-card {
  display: grid;
  gap: 24px;
}

.header-inner {
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 82px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.05rem;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  color: #fff;
  background: var(--text);
}

.main-nav {
  display: inline-flex;
  justify-content: center;
  gap: 28px;
  color: var(--text-soft);
  font-size: 0.96rem;
}

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

.header-action,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 600;
}

.header-action,
.button.primary {
  color: #fff;
  background: var(--text);
  box-shadow: none;
}

.button.secondary {
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
}

.header-action:hover,
.button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.hero {
  padding: 84px 0 64px;
}

.hero-grid {
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  align-items: center;
}

.hero-copy h1,
.section-heading h2,
.advantages-panel h3,
.contact-card h2 {
  margin: 0;
  line-height: 1.08;
}

.hero-copy h1 {
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  letter-spacing: -0.04em;
}

.hero-copy p,
.section-heading p,
.info-card p,
.scenario-card p,
.feature-item p,
.process-step p,
.advantages-panel p,
.metric-card p,
.metric-grid p,
.site-footer p {
  color: var(--text-soft);
  line-height: 1.8;
}

.eyebrow,
.section-tag,
.panel-tag {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--primary-deep);
  background: var(--primary-soft);
}

.hero-copy p {
  margin: 24px 0 0;
  max-width: 640px;
  font-size: 1.04rem;
}

.hero-actions,
.contact-actions,
.hero-points,
.cards-grid,
.metric-grid,
.process-grid {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-actions {
  margin-top: 32px;
}

.hero-points {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.hero-points li {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-soft);
}

.hero-card,
.info-card,
.scenario-card,
.process-step,
.advantages-panel,
.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 28px;
  border-radius: var(--radius-lg);
}

.metric-card,
.metric-grid article,
.info-card,
.scenario-card,
.process-step,
.advantages-panel {
  border-radius: var(--radius-md);
}

.metric-card {
  padding: 24px;
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border);
}

.metric-card p,
.metric-card .metric-label {
  color: var(--text-soft);
}

.metric-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.52rem;
}

.metric-grid {
  margin-top: 18px;
}

.metric-grid article {
  flex: 1 1 220px;
  min-width: 0;
  padding: 22px;
  background: #fafafa;
  border: 1px solid var(--border);
}

.metric-grid span,
.feature-index,
.process-step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 44px;
  border-radius: 14px;
  font-weight: 700;
  color: var(--primary-deep);
  background: var(--bg-soft);
}

.section {
  padding: 64px 0;
}

.section-muted {
  background: #fbfbfc;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 36px;
}

.section-heading h2,
.contact-card h2 {
  font-size: clamp(2rem, 3vw, 3rem);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.info-card,
.scenario-card,
.process-step,
.advantages-panel {
  padding: 28px;
}

.info-card h3,
.scenario-card h3,
.process-step h3,
.feature-item h3,
.advantages-panel h3,
.metric-grid h2 {
  margin: 16px 0 0;
  font-size: 1.18rem;
}

.advantages-layout {
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.92fr);
  align-items: start;
}

.advantages-list {
  display: grid;
  gap: 0;
  padding: 12px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.feature-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.feature-item:first-child {
  padding-top: 0;
}

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

.panel-highlight {
  display: grid;
  gap: 6px;
  margin-top: 24px;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: #fafafa;
  border: 1px solid var(--border);
}

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

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.contact-section {
  padding-bottom: 84px;
}

.contact-card {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  padding: 34px;
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.site-footer {
  padding: 24px 0 42px;
  border-top: 1px solid var(--border);
  background: #fcfcfd;
}

.footer-inner {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.footer-brand {
  margin-bottom: 8px;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1080px) {
  .hero-grid,
  .advantages-layout,
  .contact-card,
  .footer-inner {
    grid-template-columns: 1fr;
  }

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

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

  .contact-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 780px) {
  :root {
    --container: min(100vw - 28px, 1160px);
  }

  .site-header {
    position: static;
  }

  .header-inner {
    grid-template-columns: 1fr;
    justify-items: start;
    padding: 16px 0;
  }

  .main-nav {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 18px;
  }

  .hero {
    padding-top: 36px;
  }

  .hero-actions,
  .contact-actions {
    width: 100%;
  }

  .button,
  .header-action {
    width: 100%;
  }

  .cards-grid,
  .scenario-grid,
  .process-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy h1 {
    font-size: clamp(2.3rem, 11vw, 3.4rem);
  }

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