:root {
  --bg: #f6f8fb;
  --ink: #121826;
  --muted: #5d6b7f;
  --line: #dce4ee;
  --panel: #ffffff;
  --navy: #0b1220;
  --navy-2: #111827;
  --cyan: #15b8d9;
  --cyan-dark: #0e7490;
  --green: #16a34a;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
  padding: 0 clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 760;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--navy);
  color: #fff;
  font-size: 15px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 26px;
  color: #435167;
  font-size: 14px;
}

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

.header-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

.header-cta {
  background: var(--navy);
  color: #fff;
}

.hero {
  background: radial-gradient(circle at 70% 15%, rgba(21, 184, 217, 0.18), transparent 30%), linear-gradient(135deg, #07101f 0%, #111827 62%, #0b1220 100%);
  color: #fff;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 1.15fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  min-height: min(620px, calc(86vh - 68px));
  padding: clamp(34px, 5vw, 66px) clamp(20px, 5vw, 72px) clamp(32px, 4vw, 52px);
}

.hero-copy {
  max-width: 650px;
}

.hero h1 {
  margin: 0;
  max-width: 650px;
  font-size: clamp(40px, 5.4vw, 74px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-lead {
  margin: 24px 0 0;
  max-width: 620px;
  color: #d1d8e5;
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button.primary {
  background: var(--cyan);
  color: #06131c;
  box-shadow: 0 12px 32px rgba(21, 184, 217, 0.28);
}

.button.ghost {
  border: 1px solid rgba(255, 255, 255, 0.24);
  color: #ecf7fb;
}

.button.wide {
  width: 100%;
}

.hero-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 42px 0 0;
}

.hero-points div {
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.hero-points dt {
  font-weight: 760;
}

.hero-points dd {
  margin: 4px 0 0;
  color: #aab7c8;
  font-size: 13px;
}

.hero-visual {
  margin: 0;
}

.hero-visual img {
  display: block;
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.38);
}

.section {
  padding: clamp(64px, 8vw, 108px) clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading h2,
.materials-panel h2,
.contact h2,
.policy h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 3vw, 44px);
  line-height: 1.18;
  letter-spacing: 0;
}

.section-heading p,
.materials-panel p,
.contact p,
.policy p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.intro {
  background: #fff;
}

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

.intro-grid article,
.feature-card,
.compliance-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 24px;
}

.intro-grid h3,
.feature-card h3,
.compliance-grid h3,
.timeline h3 {
  margin: 0;
  font-size: 20px;
  line-height: 1.3;
}

.intro-grid p,
.feature-card p,
.compliance-grid p,
.timeline p {
  margin: 10px 0 0;
  color: var(--muted);
}

.number {
  display: block;
  margin-bottom: 18px;
  color: var(--cyan-dark);
  font-weight: 780;
}

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

.icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 18px;
  border-radius: 8px;
  background: #e6fbff;
  color: var(--cyan-dark);
  font-weight: 780;
}

.workflow {
  background: #fff;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
}

.timeline span {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 20px;
  border-radius: 8px;
  background: var(--navy);
  color: #fff;
  font-weight: 780;
}

.compliance {
  background: linear-gradient(180deg, #f6f8fb 0%, #eef4f8 100%);
}

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

.materials {
  background: #fff;
}

.materials-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 1fr);
  gap: 32px;
  align-items: start;
  padding: clamp(28px, 5vw, 46px);
  border-radius: 8px;
  background: var(--navy);
  color: #fff;
  box-shadow: var(--shadow);
}

.materials-panel h2 {
  color: #fff;
}

.materials-panel p {
  color: #c9d4e1;
}

.materials-panel ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.materials-panel li {
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  color: #e6edf5;
}

.materials-panel li:last-child {
  border-bottom: 0;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 420px);
  gap: 32px;
  align-items: center;
  background: #eef4f8;
}

.contact-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.contact-card p {
  margin: 14px 0 0;
  color: var(--muted);
}

.contact-card .note {
  color: #8a5a00;
  font-size: 13px;
}

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

.policy article {
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.policy h2 {
  font-size: 22px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 28px clamp(20px, 5vw, 72px);
  background: var(--navy);
  color: #aeb8c7;
  font-size: 14px;
}

@media (max-width: 1080px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 780px;
  }

  .hero-visual {
    max-width: 860px;
  }

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

@media (max-width: 760px) {
  .site-header {
    position: static;
    flex-wrap: wrap;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .nav {
    order: 3;
    width: 100%;
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .header-cta {
    min-height: 38px;
  }

  .hero-inner {
    min-height: auto;
    padding-top: 30px;
    padding-bottom: 28px;
  }

  .hero h1 {
    font-size: 34px;
    line-height: 1.12;
  }

  .hero-lead {
    margin-top: 18px;
  }

  .hero-actions {
    margin-top: 22px;
  }

  .hero-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 24px;
    gap: 8px;
  }

  .hero-points div {
    padding: 12px 10px;
  }

  .hero-points dt {
    font-size: 14px;
  }

  .hero-points dd {
    font-size: 12px;
  }

  .hero-visual img {
    max-height: 145px;
    object-fit: cover;
    object-position: center;
  }

  .intro-grid,
  .feature-grid,
  .timeline,
  .compliance-grid,
  .materials-panel,
  .contact,
  .policy {
    grid-template-columns: 1fr;
  }

  .section {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .footer {
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  .hero-actions {
    flex-direction: row;
  }

  .hero-actions .button {
    flex: 1 1 0;
    padding-right: 10px;
    padding-left: 10px;
  }

  .hero h1 {
    font-size: 32px;
  }
}