:root {
  --ink: #17212b;
  --muted: #60707f;
  --subtle: #edf2f0;
  --line: #dce5e1;
  --panel: #ffffff;
  --panel-quiet: #f7faf8;
  --brand: #0e766e;
  --brand-strong: #075e57;
  --brand-soft: #e5f4f1;
  --gold: #b78a2f;
  --gold-soft: #fbf5e7;
  --blue: #245c7d;
  --night: #071722;
  --radius: 8px;
  --shadow: 0 18px 40px rgba(23, 33, 43, 0.08);
  --container: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #fbfcfb;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.6;
  letter-spacing: 0;
}

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

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

.container {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(220, 229, 225, 0.86);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 214px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  display: block;
  overflow: hidden;
  border: 1px solid rgba(6, 37, 56, 0.16);
  border-radius: 10px;
  background-color: #062538;
  box-shadow: 0 8px 18px rgba(6, 37, 56, 0.12);
}

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

.brand strong {
  display: block;
  font-size: 17px;
  line-height: 1.1;
}

.brand span:last-child {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  border-radius: 6px;
  padding: 0 12px;
  color: #334451;
  font-size: 14px;
  font-weight: 650;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--brand-soft);
  color: var(--brand-strong);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.menu-toggle {
  display: none;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  padding: 0 12px;
  font: inherit;
  font-weight: 700;
}

.btn {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 0 16px;
  font-weight: 750;
  font-size: 14px;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-primary:hover {
  background: var(--brand-strong);
}

.btn-secondary {
  border-color: rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.11);
  color: #fff;
}

.btn-light {
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
}

.hero {
  position: relative;
  min-height: min(720px, calc(100svh - 112px));
  display: flex;
  align-items: center;
  overflow: hidden;
  background-image: linear-gradient(90deg, rgba(5, 17, 28, 0.82), rgba(5, 17, 28, 0.48), rgba(5, 17, 28, 0.18)), url("hero-infrastructure.png");
  background-size: cover;
  background-position: center;
  color: #fff;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.2);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 780px;
  padding: 74px 0 84px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: #a5e8db;
  font-size: 14px;
  font-weight: 760;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: #a5e8db;
}

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

h1 {
  margin-top: 20px;
  font-size: 72px;
  line-height: 1.04;
  font-weight: 850;
  text-wrap: balance;
}

.hero-lede {
  margin-top: 22px;
  max-width: 720px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 20px;
  line-height: 1.72;
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-metrics {
  margin-top: 42px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  max-width: 720px;
}

.hero-metrics div {
  border-left: 1px solid rgba(255, 255, 255, 0.34);
  padding-left: 16px;
}

.hero-metrics strong {
  display: block;
  font-size: 22px;
}

.hero-metrics span {
  display: block;
  margin-top: 4px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
}

.section {
  padding: 82px 0;
}

.section-tight {
  padding: 56px 0;
}

.section-muted {
  background: var(--panel-quiet);
}

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

.section-head {
  max-width: 860px;
  margin-bottom: 32px;
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.kicker {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 820;
}

h2 {
  font-size: 40px;
  line-height: 1.18;
  font-weight: 820;
  text-wrap: balance;
}

h3 {
  font-size: 19px;
  line-height: 1.35;
  font-weight: 780;
}

.section-head p,
.text-lede {
  margin-top: 14px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.82;
}

.section-dark .section-head p,
.section-dark .text-lede {
  color: rgba(255, 255, 255, 0.72);
}

.trust-strip {
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  border-left: 1px solid var(--line);
}

.trust-item {
  min-height: 104px;
  border-right: 1px solid var(--line);
  padding: 22px;
}

.trust-item strong {
  display: block;
  color: var(--ink);
  font-size: 15px;
}

.trust-item span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

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

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

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 24px;
  box-shadow: 0 1px 0 rgba(23, 33, 43, 0.02);
}

.card:hover {
  border-color: rgba(14, 118, 110, 0.32);
}

.card p {
  margin-top: 10px;
  color: var(--muted);
  font-size: 15px;
}

.index-badge {
  width: 38px;
  height: 32px;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
  border-radius: 6px;
  background: var(--brand-soft);
  color: var(--brand-strong);
  font-weight: 820;
  font-size: 13px;
}

.split {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 40px;
  align-items: start;
}

.feature-list {
  display: grid;
  gap: 12px;
}

.feature-row {
  display: grid;
  grid-template-columns: 118px 1fr;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}

.feature-row:first-child {
  border-top: 1px solid var(--line);
}

.feature-row strong {
  color: var(--brand-strong);
}

.feature-row span {
  color: var(--muted);
}

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

.delivery-card {
  min-height: 320px;
  display: flex;
  flex-direction: column;
}

.delivery-card .label {
  width: fit-content;
  margin-bottom: 18px;
  border-radius: 6px;
  background: var(--gold-soft);
  color: #7a5a1e;
  padding: 4px 9px;
  font-size: 12px;
  font-weight: 760;
}

.delivery-card ul,
.plain-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.delivery-card li,
.plain-list li {
  position: relative;
  padding-left: 20px;
  color: var(--muted);
  font-size: 14px;
}

.delivery-card li::before,
.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
}

.scenario-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 22px;
}

.scenario-panel {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.06);
  padding: 26px;
}

.scenario-panel p,
.scenario-panel li {
  color: rgba(255, 255, 255, 0.72);
}

.model-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.model-tags span {
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  padding: 8px 11px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 14px;
  font-weight: 680;
}

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

.price-card {
  position: relative;
  display: flex;
  min-height: 420px;
  flex-direction: column;
}

.price-card.featured {
  border-color: rgba(14, 118, 110, 0.44);
  box-shadow: var(--shadow);
}

.price {
  margin: 20px 0 4px;
  font-size: 34px;
  font-weight: 840;
}

.price small {
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

.price-note {
  color: var(--muted);
  font-size: 13px;
}

.price-card .btn {
  margin-top: auto;
}

.page-hero {
  padding: 82px 0 62px;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.page-hero .container {
  max-width: 940px;
}

.page-hero h1 {
  margin-top: 0;
  color: var(--ink);
  font-size: 56px;
}

.page-hero p {
  margin-top: 18px;
  max-width: 780px;
  color: var(--muted);
  font-size: 18px;
}

.process {
  display: grid;
  gap: 14px;
  counter-reset: step;
}

.process-item {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 18px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 20px;
}

.process-item::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 6px;
  background: var(--brand-soft);
  color: var(--brand-strong);
  font-weight: 820;
}

.matrix {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.matrix th,
.matrix td {
  border-bottom: 1px solid var(--line);
  padding: 16px;
  text-align: left;
  vertical-align: top;
}

.matrix th {
  background: var(--panel-quiet);
  color: #344653;
  font-size: 14px;
}

.matrix td {
  color: var(--muted);
  font-size: 14px;
}

.matrix tr:last-child td {
  border-bottom: 0;
}

.lead-wrap {
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  gap: 26px;
  align-items: start;
}

.contact-methods {
  display: grid;
  gap: 14px;
}

.contact-method {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 18px;
}

.contact-method strong {
  display: block;
}

.contact-method span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  word-break: break-word;
}

.lead-form {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 26px;
  box-shadow: var(--shadow);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.field {
  display: grid;
  gap: 7px;
}

.field.full {
  grid-column: 1 / -1;
}

.field label {
  color: #30414d;
  font-size: 13px;
  font-weight: 740;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid #ccd8d3;
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  padding: 11px 12px;
  font: inherit;
  font-size: 14px;
}

.field textarea {
  min-height: 126px;
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid rgba(14, 118, 110, 0.18);
  border-color: var(--brand);
}

.form-note {
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
}

.form-status {
  min-height: 22px;
  margin-top: 12px;
  color: var(--brand-strong);
  font-weight: 700;
  font-size: 14px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 36px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr repeat(3, minmax(0, 0.5fr));
  gap: 28px;
}

.footer-title {
  margin-bottom: 10px;
  color: var(--ink);
  font-weight: 800;
}

.footer-grid p,
.footer-grid a,
.copyright {
  color: var(--muted);
  font-size: 14px;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.copyright {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

@media (max-width: 960px) {
  .nav {
    flex-wrap: wrap;
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
  }

  .nav-links {
    order: 3;
    width: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding-bottom: 14px;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    justify-content: center;
  }

  .nav-actions .btn {
    display: none;
  }

  .hero {
    min-height: auto;
  }

  .hero-content {
    padding: 72px 0 76px;
  }

  h1 {
    font-size: 56px;
  }

  h2 {
    font-size: 34px;
  }

  .page-hero h1 {
    font-size: 44px;
  }

  .hero-lede {
    font-size: 18px;
  }

  .hero-metrics,
  .trust-grid,
  .grid-3,
  .grid-2,
  .delivery,
  .scenario-grid,
  .pricing-grid,
  .lead-wrap,
  .footer-grid,
  .split {
    grid-template-columns: 1fr;
  }

  .trust-grid {
    border-left: 0;
  }

  .trust-item {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .feature-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

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

  .brand {
    min-width: auto;
  }

  .brand span:last-child {
    display: none;
  }

  .hero-actions {
    flex-direction: column;
  }

  h1 {
    font-size: 42px;
  }

  h2 {
    font-size: 30px;
  }

  .page-hero h1 {
    font-size: 36px;
  }

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

  .hero-actions .btn {
    width: 100%;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 58px 0;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .matrix {
    display: block;
    overflow-x: auto;
  }
}