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

:root {
  --color-primary: #1a5f4a;
  --color-primary-dark: #134536;
  --color-primary-light: #e8f3ef;
  --color-accent: #c8960c;
  --color-text: #2c3e35;
  --color-text-light: #5a6b62;
  --color-bg: #fafaf8;
  --color-white: #ffffff;
  --color-border: #e2e8e4;
  --shadow-sm: 0 2px 8px rgba(26, 95, 74, 0.08);
  --shadow-md: 0 8px 24px rgba(26, 95, 74, 0.12);
  --radius: 12px;
  --header-height: 72px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.header.scrolled {
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 700;
  font-size: 15px;
  border-radius: 10px;
}

.logo-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary-dark);
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  font-size: 15px;
  color: var(--color-text-light);
  transition: color 0.2s;
  position: relative;
}

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

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.2s;
}

.nav a:hover::after {
  width: 100%;
}

.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-primary);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  background:
    linear-gradient(135deg, rgba(26, 95, 74, 0.92) 0%, rgba(19, 69, 54, 0.88) 100%),
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  color: var(--color-white);
}

.hero-content {
  padding: 80px 0;
}

.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  font-size: 14px;
  letter-spacing: 2px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
}

.hero-desc {
  max-width: 620px;
  font-size: 17px;
  opacity: 0.9;
  margin-bottom: 36px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  transition: background 0.2s, transform 0.2s, border-color 0.2s;
}

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

.btn-primary:hover {
  background: #b0850a;
  transform: translateY(-1px);
}

.btn-outline {
  border: 2px solid rgba(255, 255, 255, 0.6);
  color: var(--color-white);
}

.btn-outline:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

/* Sections */
.section {
  padding: 96px 0;
}

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

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

.section-head h2 {
  font-size: 32px;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.section-head p {
  font-size: 14px;
  color: var(--color-text-light);
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  margin-bottom: 16px;
  color: var(--color-text-light);
  font-size: 16px;
}

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

.stat-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: box-shadow 0.2s, transform 0.2s;
}

.section-alt .stat-card,
.section .about-stats .stat-card {
  background: var(--color-primary-light);
  border-color: transparent;
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.stat-card strong {
  display: block;
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.stat-card span {
  font-size: 14px;
  color: var(--color-text-light);
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: box-shadow 0.2s, transform 0.2s;
}

.section-alt .card {
  background: var(--color-bg);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.card-icon {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.card h3 {
  font-size: 18px;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* Advantages */
.advantage-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.advantage-list li {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.advantage-list h3 {
  font-size: 18px;
  color: var(--color-primary-dark);
  margin-bottom: 10px;
}

.advantage-list p {
  font-size: 15px;
  color: var(--color-text-light);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 20px 24px;
  background: var(--color-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.contact-label {
  font-size: 13px;
  color: var(--color-text-light);
}

.contact-value {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-primary-dark);
}

.contact-note {
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius);
  padding: 36px 32px;
}

.contact-note h3 {
  font-size: 20px;
  margin-bottom: 16px;
}

.contact-note p {
  opacity: 0.92;
  margin-bottom: 12px;
}

.contact-tip {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-weight: 500;
}

/* Footer */
.footer {
  background: #1a2420;
  color: rgba(255, 255, 255, 0.7);
  padding: 40px 0;
  text-align: center;
}

.footer-company {
  font-size: 16px;
  color: var(--color-white);
  margin-bottom: 8px;
}

.footer-copy {
  font-size: 13px;
  margin-bottom: 8px;
}

.footer-beian a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  transition: color 0.2s;
}

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

/* Responsive */
@media (max-width: 960px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: 8px 0;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s, opacity 0.3s;
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav a {
    padding: 14px 24px;
    display: block;
  }

  .nav a::after {
    display: none;
  }

  .logo-text {
    font-size: 14px;
    max-width: 200px;
    line-height: 1.3;
  }

  .section {
    padding: 64px 0;
  }

  .advantage-list {
    grid-template-columns: 1fr;
  }

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

  .about-stats {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .about-stats {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}