:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #18212f;
  --muted: #647083;
  --line: #dfe5ed;
  --primary: #1268f3;
  --primary-dark: #0d4fb7;
  --accent: #18a57b;
  --dark: #111827;
  --dark-soft: #1e293b;
  --shadow: 0 18px 48px rgba(21, 34, 54, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 6vw;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(223, 229, 237, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 8px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #344054;
  font-size: 14px;
}

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

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 38px;
  padding: 0 18px;
  color: #fff;
  background: var(--primary);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
}

.hero {
  position: relative;
  min-height: 720px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #eef3f9;
}

.hero-media {
  position: absolute;
  inset: 0;
  background-image: url("hero-datacenter.jpg");
  background-size: cover;
  background-position: center right;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(246, 248, 251, 0.98) 0%, rgba(246, 248, 251, 0.92) 34%, rgba(246, 248, 251, 0.46) 60%, rgba(246, 248, 251, 0.1) 100%),
    linear-gradient(180deg, rgba(246, 248, 251, 0.2), rgba(246, 248, 251, 0.96));
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(1120px, 88vw);
  margin: 0 auto;
  padding-top: 72px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 680px;
  margin: 0;
  color: #111827;
  font-size: 58px;
  line-height: 1.12;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 620px;
  margin: 24px 0 0;
  color: #475467;
  font-size: 19px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 142px;
  height: 48px;
  padding: 0 22px;
  border-radius: 6px;
  font-weight: 700;
}

.btn.primary {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 14px 28px rgba(18, 104, 243, 0.22);
}

.btn.ghost {
  color: #1f2937;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(169, 180, 196, 0.8);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 680px;
  margin-top: 46px;
}

.hero-stats div {
  padding: 18px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(223, 229, 237, 0.9);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(21, 34, 54, 0.08);
}

.hero-stats strong,
.hero-stats span {
  display: block;
}

.hero-stats strong {
  color: #111827;
  font-size: 20px;
}

.hero-stats span {
  margin-top: 5px;
  color: #647083;
  font-size: 13px;
}

.section {
  padding: 92px 6vw;
}

.section-heading {
  width: min(900px, 100%);
  margin: 0 auto 42px;
  text-align: center;
}

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

.section-heading h2 {
  margin: 0;
  color: #101828;
  font-size: 34px;
  line-height: 1.25;
  letter-spacing: 0;
}

.section-heading p:last-child {
  max-width: 760px;
  margin: 16px auto 0;
  color: var(--muted);
  font-size: 16px;
}

.intro {
  background: #fff;
}

.value-grid,
.partner-list,
.model-grid,
.advantage-grid,
.faq-grid {
  width: min(1120px, 100%);
  margin: 0 auto;
}

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

.value-grid article,
.partner-list article,
.model-card,
.faq details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.value-grid article {
  padding: 28px;
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 28px;
  margin-bottom: 18px;
  color: var(--primary);
  background: #e8f1ff;
  border-radius: 5px;
  font-size: 13px;
  font-weight: 800;
}

h3 {
  margin: 0 0 10px;
  color: #111827;
  font-size: 20px;
  line-height: 1.35;
}

article p,
details p,
.scenario-copy p,
.contact-panel p {
  margin: 0;
  color: var(--muted);
}

.muted {
  background: #eef3f8;
}

.partner-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.partner-list article {
  padding: 24px;
}

.partner-list h3 {
  font-size: 18px;
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.model-card {
  position: relative;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(21, 34, 54, 0.06);
}

.model-card.featured {
  border-color: rgba(18, 104, 243, 0.45);
  box-shadow: var(--shadow);
}

.tag {
  display: inline-flex;
  margin: 0 0 18px;
  padding: 4px 10px;
  color: var(--primary-dark);
  background: #e8f1ff;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 800;
}

.model-card ul {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.model-card li {
  position: relative;
  margin-top: 10px;
  padding-left: 18px;
  color: #475467;
  font-size: 14px;
}

.model-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  background: var(--accent);
  border-radius: 50%;
}

.dark {
  color: #fff;
  background: var(--dark);
}

.dark .section-heading h2,
.dark h3 {
  color: #fff;
}

.dark .eyebrow {
  color: #7dd3fc;
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.advantage-grid article {
  min-height: 160px;
  padding: 26px;
  background: var(--dark-soft);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
}

.advantage-grid p {
  color: #cbd5e1;
}

.scenario {
  background: #fff;
}

.scenario-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
  gap: 32px;
  align-items: stretch;
  width: min(1120px, 100%);
  margin: 0 auto;
}

.scenario-copy {
  padding: 36px;
  background: #f7fbff;
  border: 1px solid #d9e8fb;
  border-radius: 8px;
}

.scenario-copy h3 {
  font-size: 26px;
}

.text-link {
  display: inline-flex;
  margin-top: 24px;
  color: var(--primary);
  font-weight: 800;
}

.scenario-metrics {
  display: grid;
  gap: 14px;
}

.scenario-metrics div {
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 5px solid var(--primary);
  border-radius: 8px;
}

.scenario-metrics strong {
  display: block;
  margin-bottom: 6px;
  color: #111827;
  font-size: 22px;
}

.scenario-metrics span {
  color: var(--muted);
}

.process {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  width: min(1120px, 100%);
  margin: 0 auto;
}

.process article {
  position: relative;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.process span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 18px;
  color: #fff;
  background: var(--primary);
  border-radius: 50%;
  font-weight: 800;
}

.process h3 {
  font-size: 18px;
}

.process p {
  color: var(--muted);
  font-size: 14px;
}

.faq {
  background: #fff;
}

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

.faq details {
  padding: 20px 22px;
}

.faq summary {
  cursor: pointer;
  color: #111827;
  font-weight: 800;
}

.faq details p {
  margin-top: 12px;
}

.contact {
  background: linear-gradient(135deg, #eef5ff, #f7f9fc);
}

.contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 0.75fr);
  gap: 38px;
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 42px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.contact-panel h2 {
  margin: 0 0 18px;
  color: #101828;
  font-size: 34px;
  line-height: 1.28;
  letter-spacing: 0;
}

.contact-list {
  display: grid;
  gap: 10px;
  margin-top: 26px;
  color: #344054;
}

.contact-card {
  display: grid;
  align-content: center;
  gap: 16px;
  min-height: 260px;
  padding: 34px;
  background: #f7fbff;
  border: 1px solid #d9e8fb;
  border-radius: 8px;
}

.contact-label {
  color: var(--primary);
  font-size: 14px;
  font-weight: 800;
}

.contact-card strong {
  color: #101828;
  font-size: 34px;
  line-height: 1;
}

.contact-card p {
  color: var(--muted);
}

.contact-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.contact-tags span {
  padding: 6px 10px;
  color: #155eef;
  background: #e8f1ff;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 700;
}

.site-footer {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 18px 6vw;
  color: #667085;
  background: #fff;
  border-top: 1px solid var(--line);
  font-size: 12px;
}

@media (max-width: 980px) {
  .site-header {
    height: auto;
    min-height: 68px;
    padding: 14px 5vw;
  }

  .nav {
    display: none;
  }

  .hero {
    min-height: 680px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero-copy {
    font-size: 17px;
  }

  .hero-stats,
  .value-grid,
  .partner-list,
  .model-grid,
  .advantage-grid,
  .process,
  .faq-grid,
  .scenario-wrap,
  .contact-panel {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .site-header {
    position: sticky;
  }

  .header-cta {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 70px;
  }

  .hero-media {
    opacity: 0.45;
  }

  .hero-content {
    padding-top: 0;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero-stats,
  .partner-list {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 64px 5vw;
  }

  .section-heading h2,
  .contact-panel h2 {
    font-size: 28px;
  }

  .contact-panel {
    padding: 26px;
  }

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