:root {
  --ink: #17202a;
  --muted: #596775;
  --line: #d8e1ea;
  --paper: #f7fafc;
  --white: #ffffff;
  --blue: #0b66c3;
  --blue-dark: #074f97;
  --green: #16866d;
  --gold: #b97816;
  --shadow: 0 18px 45px rgba(20, 42, 70, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.65;
}

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

.site-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 6vw;
  background: rgba(255, 255, 255, 0.91);
  border-bottom: 1px solid rgba(216, 225, 234, 0.78);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 150px;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  color: #fff;
  background: var(--blue);
  border-radius: 8px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 18px;
  line-height: 1.1;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.2;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  color: #314255;
  font-size: 15px;
}

.nav-links a {
  white-space: nowrap;
}

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

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #dbe9f2;
}

.hero-image,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(247, 250, 252, 0.95) 0%, rgba(247, 250, 252, 0.82) 34%, rgba(247, 250, 252, 0.18) 72%),
    linear-gradient(180deg, rgba(247, 250, 252, 0.1) 58%, var(--paper) 100%);
}

.hero-content {
  position: relative;
  max-width: 650px;
  padding: 126px 6vw 84px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(70px, 11vw, 132px);
  line-height: 0.95;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 560px;
  margin: 24px 0 0;
  color: #2d3d4d;
  font-size: clamp(18px, 2vw, 25px);
  line-height: 1.55;
}

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

.button {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 700;
}

.button.primary {
  color: #fff;
  background: var(--blue);
}

.button.secondary {
  color: var(--blue-dark);
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(11, 102, 195, 0.22);
}

.section {
  padding: 86px 6vw;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 32px;
}

.section-heading h2,
.system-copy h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.16;
  letter-spacing: 0;
}

.section-heading p:not(.eyebrow),
.system-copy p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.intro-grid article,
.article-grid article,
.path-panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 30px rgba(41, 66, 90, 0.08);
}

.intro-grid article {
  padding: 24px;
}

.intro-grid span {
  color: var(--gold);
  font-weight: 800;
}

.intro-grid h3,
.article-grid h3,
.path-panel h3 {
  margin: 12px 0 10px;
  font-size: 21px;
  line-height: 1.3;
}

.intro-grid p,
.article-grid span,
.path-panel p,
.path-panel li {
  color: var(--muted);
}

.system-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
  gap: 44px;
  align-items: center;
  background: #eaf3f6;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

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

.loop div {
  min-height: 138px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.loop strong,
.loop span {
  display: block;
}

.loop strong {
  font-size: 28px;
}

.loop span {
  margin-top: 8px;
  color: var(--green);
  font-weight: 700;
}

.ecommerce {
  background: var(--white);
}

.path-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 20px;
}

.path-panel {
  padding: 28px;
}

.path-panel ul {
  margin: 16px 0 0;
  padding-left: 20px;
}

.path-panel.emphasis {
  color: #fff;
  background: var(--blue-dark);
  border-color: var(--blue-dark);
}

.path-panel.emphasis p,
.path-panel.emphasis h3 {
  color: #fff;
}

.path-title {
  margin: 8px 0 8px;
  font-size: 34px;
  font-weight: 800;
  line-height: 1.2;
}

.node-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.node-strip span {
  padding: 9px 13px;
  color: #184052;
  background: #edf6f3;
  border: 1px solid #cae4dc;
  border-radius: 8px;
  font-weight: 700;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.article-grid article {
  min-height: 212px;
  padding: 24px;
}

.article-grid p {
  margin: 0;
  color: var(--green);
  font-size: 14px;
  font-weight: 800;
}

.domains {
  background: #122235;
}

.domains .section-heading h2 {
  color: #fff;
}

.domains .eyebrow {
  color: #70c9ad;
}

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

.domain-list a {
  display: block;
  min-height: 128px;
  padding: 22px;
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
}

.domain-list strong,
.domain-list span {
  display: block;
}

.domain-list strong {
  font-size: 20px;
  overflow-wrap: anywhere;
}

.domain-list span {
  margin-top: 10px;
  color: #c9d7e4;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 6vw;
  color: #536273;
  background: var(--white);
  border-top: 1px solid var(--line);
}

.site-footer strong,
.site-footer span {
  display: block;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .nav-links {
    gap: 14px;
    font-size: 14px;
  }

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

  .system-band,
  .path-layout,
  .domain-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-header {
    position: absolute;
    align-items: flex-start;
    min-height: 118px;
    padding: 16px 5vw;
    flex-direction: column;
    gap: 12px;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    min-height: 760px;
    align-items: flex-end;
  }

  .hero-image {
    object-position: 58% center;
  }

  .hero-overlay {
    background:
      linear-gradient(180deg, rgba(247, 250, 252, 0.9) 0%, rgba(247, 250, 252, 0.7) 28%, rgba(247, 250, 252, 0.96) 73%, var(--paper) 100%);
  }

  .hero-content {
    padding: 168px 5vw 54px;
  }

  .section {
    padding: 62px 5vw;
  }

  .intro-grid,
  .article-grid,
  .loop {
    grid-template-columns: 1fr;
  }

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