:root {
  --navy: #081528;
  --blue: #1456d9;
  --cyan: #28c7e8;
  --violet: #7657ff;
  --ink: #102033;
  --muted: #627086;
  --line: #e3eaf5;
  --bg: #f6f9fd;
  --white: #ffffff;
  --shadow: 0 18px 48px rgba(16, 32, 51, .12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 76px;
  padding: 0 clamp(18px, 5vw, 72px);
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid rgba(227, 234, 245, .9);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  color: var(--white);
  font-weight: 800;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
}

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

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

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex: 1;
  color: #32445b;
  font-size: 15px;
}

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

.header-cta,
.primary-btn,
.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 6px;
  font-weight: 700;
}

.header-cta,
.primary-btn {
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  box-shadow: 0 12px 26px rgba(20, 86, 217, .24);
}

.secondary-btn {
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, .32);
  background: rgba(255, 255, 255, .1);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 6px;
  background: #eef4fb;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.hero {
  position: relative;
  min-height: calc(100vh - 76px);
  padding: clamp(80px, 12vw, 136px) clamp(18px, 6vw, 88px) 40px;
  overflow: hidden;
  color: var(--white);
  background: var(--navy);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 21, 40, .94) 0%, rgba(8, 21, 40, .76) 42%, rgba(8, 21, 40, .2) 100%),
    url("assets/hero-tech.png") center right / cover no-repeat;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 22% 18%, rgba(40, 199, 232, .22), transparent 24%),
    radial-gradient(circle at 60% 70%, rgba(118, 87, 255, .2), transparent 25%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(42px, 7vw, 82px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-subtitle {
  max-width: 680px;
  margin: 24px 0 34px;
  color: rgba(255, 255, 255, .82);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.7;
}

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

.hero-panel {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 780px;
  margin-top: clamp(54px, 10vw, 110px);
  border: 1px solid rgba(255, 255, 255, .16);
  background: rgba(255, 255, 255, .08);
  backdrop-filter: blur(14px);
}

.hero-panel div {
  padding: 24px;
  border-right: 1px solid rgba(255, 255, 255, .12);
}

.hero-panel div:last-child {
  border-right: 0;
}

.hero-panel span {
  display: block;
  color: var(--cyan);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
}

.hero-panel p {
  margin: 8px 0 0;
  color: rgba(255, 255, 255, .76);
}

.section {
  padding: clamp(70px, 10vw, 112px) clamp(18px, 6vw, 88px);
}

.section-head {
  max-width: 780px;
  margin-bottom: 34px;
}

.section h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.18;
  letter-spacing: 0;
}

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

.logo-row {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
}

.logo-row span {
  display: grid;
  place-items: center;
  min-height: 76px;
  color: #718196;
  font-weight: 700;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdff;
  filter: grayscale(1);
  transition: .2s ease;
}

.logo-row span:hover {
  color: var(--blue);
  filter: grayscale(0);
  transform: translateY(-2px);
}

.service-grid,
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.service-card,
.case-card,
.contact-form,
.about-list {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.service-card {
  min-height: 280px;
  padding: 30px;
}

.icon {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 8px;
  color: var(--white);
  font-weight: 800;
  background: linear-gradient(135deg, var(--blue), var(--violet));
}

.service-card h3 {
  margin: 26px 0 12px;
  font-size: 24px;
}

.service-card p,
.about-copy p,
.contact-info p {
  color: var(--muted);
  line-height: 1.8;
}

.service-card a {
  display: inline-block;
  margin-top: 14px;
  color: var(--blue);
  font-weight: 800;
}

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

.case-card {
  position: relative;
  min-height: 250px;
  padding: 0;
  overflow: hidden;
  color: var(--white);
  text-align: left;
  border: 0;
  cursor: pointer;
  transition: transform .22s ease, box-shadow .22s ease;
}

.case-card:hover {
  transform: scale(1.03);
  box-shadow: 0 22px 60px rgba(16, 32, 51, .2);
}

.case-card::after {
  content: "查看详情";
  position: absolute;
  left: 22px;
  bottom: 22px;
  padding: 10px 16px;
  border-radius: 6px;
  color: var(--ink);
  font-weight: 800;
  background: rgba(255, 255, 255, .9);
  opacity: 0;
  transform: translateY(10px);
  transition: .2s ease;
}

.case-card:hover::after {
  opacity: 1;
  transform: translateY(0);
}

.case-art {
  position: absolute;
  inset: 0;
}

.case-art::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 21, 40, .08), rgba(8, 21, 40, .74));
}

.case-a { background: linear-gradient(135deg, #1155cc, #22c1c3); }
.case-b { background: linear-gradient(135deg, #1e3358, #7b61ff); }
.case-c { background: linear-gradient(135deg, #006d77, #83c5be); }
.case-d { background: linear-gradient(135deg, #264653, #2a9d8f); }
.case-e { background: linear-gradient(135deg, #0f3460, #e94560); }
.case-f { background: linear-gradient(135deg, #143642, #0f8b8d); }

.case-card strong,
.case-card em {
  position: relative;
  z-index: 1;
  display: block;
  margin-left: 22px;
  margin-right: 22px;
}

.case-card strong {
  margin-top: 150px;
  font-size: 22px;
}

.case-card em {
  width: max-content;
  margin-top: 10px;
  padding: 6px 10px;
  border-radius: 6px;
  font-style: normal;
  background: rgba(255, 255, 255, .16);
}

.about {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(320px, .75fr);
  gap: 44px;
  align-items: center;
}

.about-list {
  padding: 12px;
}

.about-list div {
  display: grid;
  gap: 8px;
  padding: 24px;
  border-bottom: 1px solid var(--line);
}

.about-list div:last-child {
  border-bottom: 0;
}

.about-list span {
  color: var(--muted);
  line-height: 1.7;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(340px, .7fr);
  gap: 42px;
  color: var(--white);
  background: linear-gradient(135deg, #081528, #173a61);
}

.contact-info h2 {
  color: var(--white);
}

.contact-info p,
.contact-info li,
.contact-info a {
  color: rgba(255, 255, 255, .76);
}

.contact-info ul {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 28px 0 0;
  list-style: none;
}

.contact-form {
  display: grid;
  gap: 18px;
  padding: 28px;
  color: var(--ink);
}

.contact-form label {
  display: grid;
  gap: 8px;
  font-weight: 700;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 14px 15px;
  color: var(--ink);
  font: inherit;
  outline: none;
  background: #fbfdff;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(20, 86, 217, .1);
}

.form-tip {
  min-height: 22px;
  margin: 0;
  color: var(--blue);
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 32px clamp(18px, 6vw, 88px);
  color: rgba(255, 255, 255, .76);
  background: #06101f;
}

.footer strong {
  display: block;
  color: var(--white);
  margin-bottom: 8px;
}

.footer p {
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-meta {
  margin-top: 8px;
  font-size: 13px;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  place-items: center;
  padding: 20px;
  background: rgba(8, 21, 40, .64);
}

.modal.is-open {
  display: grid;
}

.modal-box {
  position: relative;
  width: min(520px, 100%);
  padding: 34px;
  border-radius: 8px;
  background: var(--white);
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 14px;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 6px;
  font-size: 24px;
  background: #eef4fb;
  cursor: pointer;
}

.modal-box h3 {
  margin: 0 0 12px;
  font-size: 26px;
}

.modal-box p {
  color: var(--muted);
  line-height: 1.8;
}

@media (max-width: 980px) {
  .site-header {
    justify-content: space-between;
  }

  .menu-toggle {
    display: block;
  }

  .nav,
  .header-cta {
    display: none;
  }

  .nav.is-open {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    display: grid;
    gap: 0;
    padding: 10px 18px 18px;
    background: var(--white);
    border-bottom: 1px solid var(--line);
  }

  .nav.is-open a {
    padding: 15px 0;
    border-bottom: 1px solid var(--line);
  }

  .service-grid,
  .case-grid,
  .logo-row,
  .about,
  .contact {
    grid-template-columns: 1fr 1fr;
  }

  .about-copy,
  .contact-info {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .brand {
    min-width: auto;
  }

  .brand small {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 88px;
  }

  .hero-panel,
  .service-grid,
  .case-grid,
  .logo-row,
  .about,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero-panel div {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, .12);
  }

  .hero-panel div:last-child {
    border-bottom: 0;
  }

  .case-card {
    min-height: 220px;
  }

  .case-card strong {
    margin-top: 128px;
  }

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