:root {
  --color-primary: #2A313C;
  --color-secondary: #5B86B9;
  --color-accent: #70A1FF;
  --color-white: #FFFFFF;
  --color-bg: #F4F6F8;
  --color-text: #4A5568;
  --color-dark: #2A313C;
  --radius: 10px;
  --shadow: 0 4px 20px rgba(42, 49, 60, 0.08);
  --shadow-hover: 0 8px 30px rgba(42, 49, 60, 0.14);
  --transition: 0.3s ease;
  --header-height: 72px;
  --font-cn: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", "Helvetica Neue", sans-serif;
  --font-en: Roboto, Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent);
}

address {
  font-style: normal;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
  font-family: var(--font-cn);
}

.section-title-light {
  color: var(--color-white);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text);
  max-width: 600px;
  margin: 0 auto;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-cn);
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  text-align: center;
}

.btn-primary {
  background: var(--color-secondary);
  color: var(--color-white);
  border-color: var(--color-secondary);
}

.btn-primary:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.6);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn-block {
  width: 100%;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-primary);
  height: var(--header-height);
  transition: box-shadow var(--transition);
}

.header.scrolled {
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo img {
  object-fit: contain;
}

.logo-name {
  color: var(--color-white);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 1px;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  color: rgba(255, 255, 255, 0.85);
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  transition: background var(--transition), color var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link-cta {
  background: var(--color-secondary);
  color: var(--color-white) !important;
  margin-left: 8px;
}

.nav-link-cta:hover {
  background: var(--color-accent);
}

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #6B7A8F 0%, #5B86B9 55%, #7096c7 100%);
  padding-top: var(--header-height);
  overflow: hidden;
  transition: background 0.8s ease;
}

.hero.hero-slide-0 {
  background: linear-gradient(135deg, #7A8FA3 0%, #5B86B9 50%, #6B94C8 100%);
}

.hero.hero-slide-1 {
  background: linear-gradient(135deg, #5B86B9 0%, #3D4A5C 50%, #2A313C 100%);
}

.hero.hero-slide-2 {
  background: linear-gradient(135deg, #3D4A5C 0%, #2A313C 50%, #1E2329 100%);
}

.hero-bg-pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(112, 161, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(91, 134, 185, 0.12) 0%, transparent 40%),
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: auto, auto, 40px 40px, 40px 40px;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 60px 24px;
}

.hero-tag {
  display: inline-block;
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 2px;
  margin-bottom: 16px;
  font-family: var(--font-en);
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.35rem;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 16px;
  font-weight: 500;
}

.hero-desc {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 32px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.hero-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius);
  padding: 14px 12px;
  color: var(--color-white);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.35;
  transition: background var(--transition), border-color var(--transition);
}

.hero-card:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.28);
}

.hero-card-dot {
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.7);
}

.hero-card-ai .hero-card-dot {
  background: var(--color-accent);
}

.hero-slider-dots {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}

.hero-dot {
  width: 28px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.3);
  border: none;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition);
}

.hero-dot.active {
  opacity: 1;
}

.hero-dot[data-slide="0"] { background: rgba(255, 255, 255, 0.55); }
.hero-dot[data-slide="1"] { background: rgba(255, 255, 255, 0.4); }
.hero-dot[data-slide="2"] { background: rgba(255, 255, 255, 0.28); }

.hero-dot[data-slide="0"].active { background: #B8D4F0; }
.hero-dot[data-slide="1"].active { background: #8BB0D9; }
.hero-dot[data-slide="2"].active { background: #5B86B9; }

.services {
  background: var(--color-bg);
}

.service-group {
  margin-bottom: 48px;
}

.service-group:last-child {
  margin-bottom: 0;
}

.service-group-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  color: var(--color-primary);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid rgba(42, 49, 60, 0.1);
}

.group-icon {
  color: var(--color-secondary);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}

.service-grid-2 {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.service-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 32px 24px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  border: 1px solid transparent;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(91, 134, 185, 0.25);
}

.service-card-ai {
  border-top: 3px solid var(--color-accent);
}

.service-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.tech-icon {
  background: rgba(42, 49, 60, 0.08);
  color: var(--color-primary);
}

.ai-icon {
  background: rgba(112, 161, 255, 0.12);
  color: var(--color-accent);
}

.device-icon {
  background: rgba(91, 134, 185, 0.1);
  color: var(--color-secondary);
}

.service-name {
  font-size: 1.1rem;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.service-text {
  font-size: 0.92rem;
  color: var(--color-text);
  line-height: 1.6;
}

.service-group-ai .service-group-title {
  color: var(--color-accent);
}

.about {
  background: var(--color-white);
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-lead {
  font-size: 1.15rem;
  color: var(--color-dark);
  font-weight: 500;
  margin-bottom: 16px;
  line-height: 1.8;
}

.about-text {
  margin-bottom: 32px;
  line-height: 1.8;
}

.about-stats {
  display: flex;
  gap: 32px;
}

.stat-item {
  text-align: center;
}

.stat-num {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-secondary);
  font-family: var(--font-en);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text);
}

.about-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.about-visual img {
  position: relative;
  z-index: 1;
}

.about-pattern {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(42, 49, 60, 0.04) 0%, rgba(112, 161, 255, 0.05) 100%);
  border-radius: var(--radius);
  border: 1px solid rgba(42, 49, 60, 0.08);
}

.products {
  background: var(--color-bg);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

.product-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid rgba(42, 49, 60, 0.08);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.product-card:hover {
  box-shadow: var(--shadow);
  border-color: rgba(91, 134, 185, 0.3);
}

.product-image {
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  background: var(--color-bg);
  border-radius: var(--radius);
}

.product-name {
  font-size: 1.1rem;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.product-desc {
  font-size: 0.9rem;
  color: var(--color-text);
}

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

.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.case-card {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 32px;
  border-left: 4px solid var(--color-secondary);
  transition: transform var(--transition), box-shadow var(--transition);
}

.case-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.case-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(91, 134, 185, 0.12);
  color: var(--color-secondary);
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.case-tag-ai {
  background: rgba(112, 161, 255, 0.14);
  color: var(--color-accent);
}

.case-name {
  font-size: 1.15rem;
  color: var(--color-dark);
  margin-bottom: 10px;
}

.case-text {
  font-size: 0.92rem;
  line-height: 1.7;
}

.contact {
  background: linear-gradient(135deg, var(--color-primary) 0%, #3D4A5C 100%);
}

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-lead {
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
  line-height: 1.8;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  color: rgba(255, 255, 255, 0.9);
}

.contact-item svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--color-accent);
}

.contact-item strong {
  display: block;
  color: var(--color-white);
  margin-bottom: 4px;
  font-size: 0.9rem;
}

.contact-item a {
  color: rgba(255, 255, 255, 0.9);
}

.contact-item a:hover {
  color: var(--color-accent);
}

.contact-qrcode {
  display: block;
  margin-top: 12px;
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 2px solid rgba(255, 255, 255, 0.2);
  background: var(--color-white);
}

.contact-form-wrap {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow-hover);
}

.form-title {
  font-size: 1.2rem;
  color: var(--color-dark);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  color: var(--color-dark);
  margin-bottom: 6px;
  font-weight: 500;
}

.required {
  color: #c0392b;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #dde3ea;
  border-radius: var(--radius);
  font-family: var(--font-cn);
  font-size: 0.95rem;
  color: var(--color-dark);
  background: var(--color-white);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(91, 134, 185, 0.18);
}

.form-group input.invalid,
.form-group textarea.invalid {
  border-color: #c0392b;
}

.form-error {
  display: block;
  color: #c0392b;
  font-size: 0.82rem;
  margin-top: 4px;
  min-height: 1.2em;
}

.form-honeypot {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  overflow: hidden;
  pointer-events: none;
}

.form-notice {
  margin-top: 16px;
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.4em;
}

.form-notice.success {
  color: #27ae60;
}

.form-notice.error {
  color: #c0392b;
}

.footer {
  background: #1E2329;
  padding: 32px 0;
  color: rgba(255, 255, 255, 0.6);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-white);
  font-weight: 600;
  font-size: 1.05rem;
}

.footer-copy {
  font-size: 0.85rem;
}

.footer-domain a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.85rem;
  font-family: var(--font-en);
}

.footer-domain a:hover {
  color: var(--color-accent);
}

.footer-beian {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px 12px;
  font-size: 0.85rem;
}

.footer-beian a {
  color: rgba(255, 255, 255, 0.6);
}

.footer-beian a:hover {
  color: var(--color-accent);
}

.footer-beian-sep {
  color: rgba(255, 255, 255, 0.3);
}

.scroll-actions {
  position: fixed;
  right: 24px;
  bottom: 32px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: 10px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
}

.scroll-actions.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-btn {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: var(--radius);
  background: var(--color-primary);
  color: var(--color-white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-hover);
  transition: background var(--transition), color var(--transition), transform var(--transition), opacity var(--transition);
}

.scroll-btn:hover {
  background: var(--color-secondary);
  transform: translateY(-2px);
}

.scroll-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
}

.scroll-btn:disabled:hover {
  background: var(--color-primary);
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 992px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    display: none;
  }

  .about-inner,
  .contact-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-stats {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .hero-title {
    font-size: 2.4rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-primary);
    padding: 16px 24px;
    transform: translateY(-120%);
    opacity: 0;
    transition: transform var(--transition), opacity var(--transition);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-link {
    display: block;
    padding: 12px 16px;
  }

  .nav-link-cta {
    margin-left: 0;
    text-align: center;
  }

  .nav-toggle.open .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle.open .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.open .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .service-grid,
  .service-grid-2 {
    grid-template-columns: 1fr;
  }

  .about-stats {
    flex-direction: column;
    gap: 20px;
  }

  .contact-form-wrap {
    padding: 24px;
  }

  .scroll-actions {
    right: 16px;
    bottom: 20px;
  }

  .scroll-btn {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .section-title {
    font-size: 1.6rem;
  }
}