:root {
  --bg: #07110f;
  --bg-2: #0b1816;
  --panel: rgba(12, 28, 26, 0.78);
  --panel-solid: #10231f;
  --ink: #effff8;
  --muted: #9fb9b2;
  --line: rgba(128, 232, 203, 0.22);
  --green: #2ad39b;
  --cyan: #55b9ff;
  --amber: #ffc15f;
  --danger: #ff7d7d;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 80% 5%, rgba(85, 185, 255, 0.18), transparent 36rem),
    radial-gradient(circle at 20% 10%, rgba(42, 211, 155, 0.18), transparent 30rem),
    linear-gradient(180deg, #07110f 0%, #091512 58%, #0b1110 100%);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  letter-spacing: 0;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(128, 232, 203, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(128, 232, 203, 0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(to bottom, black, transparent 88%);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(7, 17, 15, 0.78);
  border-bottom: 1px solid var(--line);
}

.nav-shell,
.section-inner {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
}

.nav-shell {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 900;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--green), var(--cyan));
  color: #06100e;
  box-shadow: 0 0 28px rgba(42, 211, 155, 0.45);
}

.brand small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: #c8ddd8;
  font-size: 14px;
  font-weight: 800;
}

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

.button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 18px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
  font-weight: 900;
}

.button.primary {
  color: #06100e;
  border-color: transparent;
  background: linear-gradient(135deg, var(--green), var(--cyan));
  box-shadow: 0 0 34px rgba(42, 211, 155, 0.28);
}

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

.hero {
  position: relative;
  min-height: calc(100vh - 74px);
  display: grid;
  align-items: center;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(7, 17, 15, 0.96) 0%, rgba(7, 17, 15, 0.72) 36%, rgba(7, 17, 15, 0.2) 78%),
    url("../images/hero-ai-search-network.jpg") center / cover no-repeat;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 130px;
  background: linear-gradient(transparent, var(--bg));
}

.hero .section-inner {
  position: relative;
  z-index: 1;
  padding: 76px 0 120px;
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.16;
}

h1 {
  max-width: 860px;
  font-size: clamp(44px, 6vw, 82px);
}

h2 {
  font-size: clamp(30px, 4vw, 48px);
}

h3 {
  font-size: 22px;
}

.lead {
  max-width: 760px;
  margin: 22px 0 0;
  color: #c9dcd6;
  font-size: 18px;
  line-height: 1.85;
}

.hero-actions,
.button-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 30px;
}

.hero-proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 820px;
  margin-top: 44px;
}

.proof-card,
.metric,
.card,
.answer-card,
.faq-item,
.contact-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.proof-card {
  padding: 16px;
}

.proof-card b,
.metric b {
  display: block;
  color: var(--green);
  font-size: 24px;
}

.proof-card span,
.metric span,
.card p,
.answer-card p,
.faq-item p,
.contact-card p,
.section-copy {
  color: var(--muted);
  line-height: 1.75;
}

.section {
  padding: 92px 0;
}

.section.alt {
  background: rgba(255, 255, 255, 0.025);
  border-block: 1px solid rgba(128, 232, 203, 0.12);
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  margin-bottom: 28px;
}

.section-copy {
  max-width: 640px;
  margin: 0;
}

.metrics-grid,
.cards-grid,
.process-grid,
.service-grid {
  display: grid;
  gap: 16px;
}

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

.metric {
  padding: 20px;
}

.metric b {
  font-size: 32px;
}

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

.card,
.answer-card,
.faq-item,
.contact-card {
  padding: 22px;
}

.card h3,
.answer-card h3,
.faq-item h3 {
  margin-bottom: 12px;
}

.tag {
  display: inline-flex;
  margin-bottom: 14px;
  color: #07110f;
  background: var(--green);
  border-radius: 8px;
  padding: 4px 9px;
  font-size: 12px;
  font-weight: 900;
}

.answer-card {
  background:
    linear-gradient(135deg, rgba(42, 211, 155, 0.12), rgba(85, 185, 255, 0.06)),
    rgba(12, 28, 26, 0.78);
}

.process-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.step {
  position: relative;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(12, 28, 26, 0.72);
}

.step span {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 18px;
  border-radius: 8px;
  color: #06100e;
  background: linear-gradient(135deg, var(--green), var(--cyan));
  font-weight: 900;
}

.step p {
  color: var(--muted);
  line-height: 1.7;
}

.service-grid {
  grid-template-columns: 0.85fr 1.15fr;
  align-items: start;
}

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

.service-list li {
  list-style: none;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(12, 28, 26, 0.72);
  color: #dbece7;
  line-height: 1.7;
}

.service-list ul {
  padding: 0;
  margin: 0;
}

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

.faq-item h3 {
  font-size: 20px;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.contact-card a {
  color: var(--green);
  font-weight: 900;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 30px 0;
  color: var(--muted);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.breadcrumb {
  margin-bottom: 24px;
  color: var(--muted);
}

.page-hero {
  padding: 84px 0 44px;
}

.page-hero h1 {
  font-size: clamp(40px, 5vw, 68px);
}

.content-body {
  display: grid;
  gap: 18px;
}

.content-body p,
.content-body li {
  color: var(--muted);
  line-height: 1.8;
}

.content-body ul {
  margin: 0;
  padding-left: 20px;
}

@media (max-width: 960px) {
  .site-nav {
    display: none;
  }

  .hero-proof,
  .metrics-grid,
  .cards-grid,
  .process-grid,
  .service-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .section-head {
    display: grid;
    align-items: start;
  }
}

@media (max-width: 640px) {
  .nav-shell,
  .section-inner {
    width: min(100% - 28px, 1180px);
  }

  .hero {
    min-height: auto;
  }

  .hero .section-inner {
    padding: 56px 0 92px;
  }

  h1 {
    font-size: 42px;
  }

  .button {
    width: 100%;
  }
}