:root {
  --ink: #17202a;
  --muted: #5b6774;
  --line: #dce5e8;
  --paper: #fbfcfd;
  --soft: #eef4f5;
  --teal: #0f9f8f;
  --orange: #ed7d31;
  --blue: #2f6fdd;
  --green: #4c7c59;
  --violet: #7a5bc7;
  --shadow: 0 18px 45px rgba(23, 32, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 0 clamp(20px, 5vw, 72px);
  background: rgba(251, 252, 253, 0.9);
  border-bottom: 1px solid rgba(220, 229, 232, 0.9);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: #fff;
  background: var(--ink);
  border-radius: 8px;
  font-size: 14px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--ink);
  background: #edf4f2;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-size: 22px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 1.08fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: center;
  min-height: calc(100vh - 76px);
  padding: clamp(44px, 7vw, 92px) clamp(20px, 5vw, 72px) clamp(34px, 5vw, 58px);
  overflow: hidden;
}

.hero h1,
.page-hero h1 {
  max-width: 760px;
  margin: 0;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero h1 {
  font-size: clamp(38px, 5vw, 68px);
}

.page-hero h1 {
  font-size: clamp(34px, 4.2vw, 56px);
}

.hero .lead,
.page-hero .lead {
  max-width: 650px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 22px);
}

.hero-media,
.page-hero img,
.split-band img,
.detail-card img,
.product-card img {
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-media {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  cursor: pointer;
}

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

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

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

.metric-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 0 clamp(20px, 5vw, 72px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.metric-strip div {
  padding: 24px;
  background: #fff;
}

.metric-strip strong {
  display: block;
  font-size: clamp(26px, 3vw, 42px);
  line-height: 1;
}

.metric-strip span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
}

.section,
.workflow {
  padding: clamp(62px, 8vw, 104px) clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 30px;
}

.section-heading h2,
.split-band h2,
.contact-section h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.15;
  letter-spacing: 0;
}

.section-heading p + h2,
.split-band p + h2,
.contact-section p + h2 {
  margin-top: 8px;
}

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

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

.feature-card,
.product-card,
.case-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.feature-card h3,
.product-card h3,
.case-card h3,
.scenario-list h3 {
  margin: 16px 0 8px;
  font-size: 22px;
  line-height: 1.25;
}

.feature-card p,
.product-card p,
.case-card p,
.scenario-list p,
.split-band p {
  color: var(--muted);
}

.feature-card a,
.product-card a {
  display: inline-block;
  margin-top: 10px;
  color: var(--teal);
  font-weight: 800;
}

.icon-dot {
  display: inline-grid;
  place-items: center;
  min-width: 48px;
  height: 36px;
  padding: 0 10px;
  color: #fff;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 900;
}

.teal { background: var(--teal); }
.orange { background: var(--orange); }
.blue { background: var(--blue); }
.green { background: var(--green); }

.split-band {
  display: grid;
  grid-template-columns: minmax(320px, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
  padding: clamp(62px, 8vw, 100px) clamp(20px, 5vw, 72px);
  background: #edf4f2;
}

.split-band.reverse {
  background: #f5f0e8;
}

.split-band.reverse img {
  order: 2;
}

.split-band img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.check-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 24px 0 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  color: var(--ink);
  font-weight: 700;
}

.check-list li::before {
  position: absolute;
  left: 0;
  top: 2px;
  color: var(--teal);
  content: "\2713";
}

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

.product-card {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 20px;
  align-items: center;
}

.product-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.8fr);
  gap: clamp(24px, 5vw, 62px);
  align-items: center;
  padding: clamp(54px, 7vw, 96px) clamp(20px, 5vw, 72px);
  background: linear-gradient(100deg, #ffffff 0%, #edf6f5 100%);
}

.page-hero.compact {
  min-height: 520px;
}

.page-hero.live-hero {
  background: linear-gradient(100deg, #ffffff 0%, #fff2e8 100%);
}

.page-hero img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

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

.timeline article {
  padding: 24px;
  border-left: 4px solid var(--teal);
  background: #fff;
  border-radius: 0 8px 8px 0;
  box-shadow: 0 10px 28px rgba(23, 32, 42, 0.06);
}

.timeline span {
  color: var(--orange);
  font-weight: 900;
}

.timeline h3 {
  margin: 12px 0 8px;
}

.timeline p {
  margin: 0;
  color: var(--muted);
}

.scenario-list {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.scenario-list article {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.light-section {
  background: #f6f8fa;
}

.deliverables {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.deliverables div {
  display: grid;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.deliverables span {
  color: var(--muted);
  font-size: 14px;
}

.workflow {
  background: #f7f8fb;
}

.workflow ol {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.workflow li {
  min-height: 168px;
  padding: 24px;
  border-radius: 8px;
  background: #fff;
  border-top: 4px solid var(--orange);
}

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

.workflow strong {
  font-size: 22px;
}

.workflow span {
  margin-top: 12px;
  color: var(--muted);
}

.product-detail-list {
  display: grid;
  gap: 28px;
}

.detail-card {
  display: grid;
  grid-template-columns: minmax(300px, 0.86fr) minmax(0, 1.14fr);
  gap: clamp(24px, 4vw, 46px);
  align-items: center;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.detail-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.detail-card h2 {
  margin: 0;
  font-size: clamp(28px, 3.2vw, 42px);
}

.detail-card p {
  color: var(--muted);
}

.spec-list {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
}

.spec-list div {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.spec-list dt {
  color: var(--ink);
  font-weight: 900;
}

.spec-list dd {
  margin: 0;
  color: var(--muted);
}

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

.case-card span {
  display: inline-block;
  padding: 5px 10px;
  color: #fff;
  background: var(--green);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 800;
}

.case-card strong {
  display: block;
  margin-top: 16px;
  color: var(--orange);
  font-size: 18px;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.7fr);
  gap: clamp(26px, 5vw, 64px);
  padding: clamp(62px, 8vw, 104px) clamp(20px, 5vw, 72px);
  background: #17202a;
  color: #fff;
}

.contact-section p {
  color: rgba(255, 255, 255, 0.76);
}

.contact-info {
  display: grid;
  gap: 10px;
  margin-top: 28px;
  color: rgba(255, 255, 255, 0.86);
}

.contact-form {
  display: grid;
  gap: 14px;
  padding: 24px;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}

.contact-form label {
  display: grid;
  gap: 7px;
  font-weight: 800;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 13px;
  color: var(--ink);
  font: inherit;
  resize: vertical;
}

.form-note {
  min-height: 24px;
  margin: 0;
  color: var(--teal) !important;
  font-weight: 800;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 30px clamp(20px, 5vw, 72px);
  color: #fff;
  background: var(--ink);
}

.site-footer p {
  margin: 4px 0 0;
  color: rgba(255, 255, 255, 0.72);
}

@media (max-width: 1020px) {
  .hero,
  .page-hero,
  .split-band,
  .detail-card,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .split-band.reverse img {
    order: 0;
  }

  .service-grid,
  .service-grid.four,
  .timeline,
  .deliverables,
  .workflow ol,
  .case-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .site-header {
    min-height: 68px;
  }

  .nav-toggle {
    display: inline-grid;
    place-items: center;
  }

  .site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    box-shadow: var(--shadow);
  }

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

  .site-nav a {
    padding: 13px 14px;
  }

  .hero {
    min-height: auto;
  }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(34px, 10vw, 48px);
  }

  .metric-strip,
  .service-grid,
  .service-grid.four,
  .product-preview,
  .timeline,
  .deliverables,
  .workflow ol,
  .case-grid {
    grid-template-columns: 1fr;
  }

  .product-card {
    grid-template-columns: 1fr;
  }

  .spec-list div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

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