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

:root {
  --color-bg: #0a0e17;
  --color-bg-alt: #111827;
  --color-surface: #1a2234;
  --color-primary: #3b82f6;
  --color-primary-light: #60a5fa;
  --color-accent: #06b6d4;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-border: rgba(255, 255, 255, 0.08);
  --font-sans: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --transition: 0.25s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
}

.logo-text {
  font-size: 18px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  font-size: 15px;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-primary-light);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.25), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(6, 182, 212, 0.12), transparent),
    linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    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: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black, transparent);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  margin-bottom: 24px;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--color-accent);
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 999px;
  background: rgba(6, 182, 212, 0.08);
}

.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, var(--color-text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: var(--color-text-muted);
  margin-bottom: 36px;
  max-width: 560px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), #2563eb);
  color: #fff;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(59, 130, 246, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}

/* Sections */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-primary-light);
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 16px;
}

/* About */
.about {
  background: var(--color-bg-alt);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.about-card {
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.about-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-4px);
}

.about-icon {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  opacity: 0.6;
  margin-bottom: 16px;
}

.about-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--color-text-muted);
  font-size: 15px;
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.service-item {
  padding: 28px;
  border-left: 3px solid var(--color-primary);
  background: linear-gradient(90deg, rgba(59, 130, 246, 0.08), transparent);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.service-item h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.service-item p {
  color: var(--color-text-muted);
  font-size: 14px;
}

/* Products */
.products {
  background: var(--color-bg-alt);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}

.product-card:hover {
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.product-image {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(6, 182, 212, 0.1));
  color: var(--color-text-muted);
  font-size: 15px;
}

.product-card h3 {
  padding: 20px 24px 8px;
  font-size: 18px;
}

.product-card p {
  padding: 0 24px 24px;
  color: var(--color-text-muted);
  font-size: 14px;
}

/* Contact */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact-info h2 {
  font-size: 32px;
  margin-bottom: 12px;
}

.contact-info > p {
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.contact-list {
  list-style: none;
}

.contact-list li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.contact-list strong {
  font-size: 13px;
  color: var(--color-text-muted);
  font-weight: 500;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-form input,
.contact-form textarea {
  padding: 14px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-family: inherit;
  font-size: 15px;
  transition: border-color var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.contact-form textarea {
  resize: vertical;
  min-height: 120px;
}

/* Footer */
.footer {
  padding: 48px 0 32px;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  text-align: center;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 14px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-links a {
  font-size: 14px;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-primary-light);
}

.footer-copy {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.footer-beian {
  font-size: 13px;
}

.footer-beian a {
  color: var(--color-text-muted);
  transition: color var(--transition);
}

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

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 12px 24px;
  }

  .nav-toggle {
    display: flex;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .section {
    padding: 72px 0;
  }
}