:root {
  color-scheme: light;
  --bg: #f5f7f8;
  --bg-strong: #10201d;
  --surface: #ffffff;
  --surface-soft: #edf3f0;
  --text: #16201d;
  --muted: #5f6d67;
  --line: #dce6e1;
  --accent: #0f8c72;
  --accent-strong: #0a5f51;
  --gold: #c79332;
  --sky: #4d88a8;
  --shadow: 0 18px 45px rgba(28, 47, 42, 0.12);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(220, 230, 225, 0.75);
  background: rgba(245, 247, 248, 0.9);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
}

.brand img {
  width: 34px;
  height: 34px;
}

.nav {
  display: flex;
  gap: clamp(18px, 3vw, 34px);
  color: var(--muted);
  font-size: 15px;
  font-weight: 650;
}

.nav a {
  transition:
    color 160ms ease,
    transform 160ms ease;
}

.nav a:hover {
  color: var(--accent-strong);
  transform: translateY(-1px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(340px, 0.98fr);
  gap: clamp(34px, 6vw, 88px);
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: clamp(52px, 8vw, 96px) clamp(20px, 5vw, 72px) 64px;
  overflow: hidden;
}

.hero-content {
  max-width: 720px;
}

.eyebrow,
.section-label {
  margin: 0 0 14px;
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 22px;
  font-size: clamp(68px, 13vw, 148px);
  line-height: 0.86;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 12px;
  font-size: 21px;
  line-height: 1.25;
}

.hero-copy {
  max-width: 650px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.7;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 12px 24px rgba(15, 140, 114, 0.22);
}

.button.secondary {
  border-color: var(--line);
  background: #fff;
  color: var(--text);
}

.hero-visual {
  position: relative;
  min-height: 520px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    radial-gradient(circle at 30% 25%, rgba(15, 140, 114, 0.18), transparent 28%),
    radial-gradient(circle at 74% 70%, rgba(199, 147, 50, 0.2), transparent 26%),
    linear-gradient(145deg, #ffffff, #e9f1ed);
  box-shadow: var(--shadow);
}

.hero-visual::before {
  position: absolute;
  inset: 34px;
  border: 1px dashed rgba(15, 140, 114, 0.28);
  border-radius: 8px;
  content: "";
}

.orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  border: 1px solid rgba(16, 32, 29, 0.12);
  border-radius: 999px;
  transform: translate(-50%, -50%) rotate(-18deg);
}

.orbit-one {
  width: 70%;
  height: 42%;
}

.orbit-two {
  width: 48%;
  height: 76%;
  transform: translate(-50%, -50%) rotate(28deg);
}

.core-node {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  place-items: center;
  width: 132px;
  height: 132px;
  border-radius: 8px;
  background: var(--bg-strong);
  color: #fff;
  box-shadow: 0 24px 42px rgba(16, 32, 29, 0.25);
  transform: translate(-50%, -50%);
}

.core-node img {
  width: 46px;
  height: 46px;
}

.core-node span {
  font-size: 22px;
  font-weight: 900;
}

.node {
  position: absolute;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 96px;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid rgba(15, 140, 114, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--accent-strong);
  font-size: 15px;
  font-weight: 800;
  box-shadow: 0 12px 28px rgba(28, 47, 42, 0.1);
}

.node-one {
  top: 18%;
  left: 17%;
}

.node-two {
  top: 24%;
  right: 13%;
}

.node-three {
  right: 14%;
  bottom: 20%;
}

.node-four {
  bottom: 22%;
  left: 12%;
}

.section {
  padding: clamp(64px, 9vw, 112px) clamp(20px, 5vw, 72px);
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(30px, 5vw, 76px);
  align-items: start;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.intro p:last-child,
.panel-dark p,
.contact-section p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

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

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

.capability-card {
  min-height: 250px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 12px 34px rgba(28, 47, 42, 0.06);
}

.card-index {
  display: block;
  margin-bottom: 34px;
  color: var(--gold);
  font-size: 14px;
  font-weight: 900;
}

.capability-card p,
.timeline p,
.scenario-item span {
  color: var(--muted);
  line-height: 1.7;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  gap: 22px;
  background: var(--surface-soft);
}

.panel-dark {
  padding: clamp(28px, 5vw, 48px);
  border-radius: 8px;
  background: var(--bg-strong);
  color: #fff;
}

.panel-dark .section-label {
  color: #88d7c5;
}

.panel-dark p {
  color: #bfd0ca;
}

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

.scenario-item {
  display: grid;
  grid-template-columns: minmax(120px, 0.34fr) minmax(0, 0.66fr);
  gap: 18px;
  align-items: center;
  min-height: 92px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.scenario-item strong {
  font-size: 18px;
}

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

.timeline li {
  min-height: 220px;
  padding: 24px;
  border-top: 4px solid var(--accent);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 34px rgba(28, 47, 42, 0.06);
}

.timeline span {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-bottom: 30px;
  border-radius: 8px;
  background: var(--surface-soft);
  color: var(--accent-strong);
  font-weight: 900;
}

.contact-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin: 0 clamp(20px, 5vw, 72px) clamp(56px, 8vw, 96px);
  padding: clamp(34px, 6vw, 58px);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(16, 32, 29, 0.94), rgba(10, 95, 81, 0.92)),
    url("/assets/aiskills-mark.svg") right 44px center / 190px no-repeat;
  color: #fff;
}

.contact-section .section-label {
  color: #95e1cf;
}

.contact-section p {
  max-width: 680px;
  margin-bottom: 0;
  color: #d1dfda;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 26px clamp(20px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

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

  .hero {
    min-height: auto;
  }

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

@media (max-width: 720px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    gap: 16px;
    padding-top: 18px;
    padding-bottom: 18px;
  }

  .nav {
    width: 100%;
    justify-content: space-between;
    gap: 10px;
    font-size: 14px;
  }

  .hero {
    padding-top: 42px;
  }

  .hero-visual {
    min-height: 380px;
  }

  .core-node {
    width: 104px;
    height: 104px;
  }

  .node {
    min-width: 78px;
    min-height: 38px;
    padding: 0 10px;
    font-size: 13px;
  }

  .capability-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .scenario-item,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .scenario-item {
    align-items: start;
  }

  .contact-section {
    display: grid;
    margin-bottom: 42px;
    background:
      linear-gradient(135deg, rgba(16, 32, 29, 0.96), rgba(10, 95, 81, 0.94)),
      url("/assets/aiskills-mark.svg") right 24px bottom 20px / 120px no-repeat;
  }

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