/* 基础样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #2E8B57;
  --color-primary-dark: #1F6A43;
  --color-text: #2C3E50;
  --color-muted: #5F6C7B;
  --color-surface: #FFFFFF;
  --color-surface-muted: #F4F7F5;
  --shadow-soft: 0 12px 30px rgba(46, 139, 87, 0.08);
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  line-height: 1.7;
  color: var(--color-text);
  background: #FAFCFB;
  scroll-behavior: smooth;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 clamp(24px, 7vw, 88px);
}

/* 导航栏 */
.navbar {
  background: var(--color-surface);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(95, 108, 123, 0.08);
}

.nav-container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 clamp(24px, 7vw, 88px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.logo a {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  gap: 0.75rem;
}

.logo img {
  height: 42px;
  width: auto;
  display: block;
}

.logo span {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.04em;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.nav-menu a {
  text-decoration: none;
  color: var(--color-muted);
  font-weight: 500;
  transition: color 0.2s ease;
}

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

/* 主视觉区域 */
.hero {
  background: linear-gradient(125deg, rgba(46, 139, 87, 0.22) 0%, rgba(73, 180, 122, 0.18) 45%, rgba(250, 252, 251, 0.92) 100%);
  min-height: 100vh;
  padding: 190px 0 160px;
  position: relative;
}

.hero-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 clamp(32px, 8vw, 120px);
}

.hero-content {
  max-width: 640px;
  padding-right: 2rem;
}

.hero h2 {
  font-size: 2.8rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1.2rem;
  line-height: 1.18;
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-muted);
  margin-bottom: 2.2rem;
}

.cta-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 28px;
  text-decoration: none;
  font-weight: 500;
  border: 1px solid var(--color-primary);
  transition: all 0.25s ease;
}

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

.btn.primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
}

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

.btn.secondary:hover {
  background: rgba(46, 139, 87, 0.1);
  transform: translateY(-2px);
}

.hero-visual {
  flex: 1 1 50%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration {
  width: min(100%, 480px);
  height: auto;
  display: block;
  filter: drop-shadow(0 18px 25px rgba(46, 139, 87, 0.15));
}

.hero-scroll {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: clamp(40px, 4vh, 80px);
}

.scroll-indicator {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 72px;
  border: 2px solid rgba(46, 139, 87, 0.45);
  border-radius: 999px;
  text-decoration: none;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.scroll-indicator span {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-left: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  transform: rotate(-45deg);
  animation: scrollBounce 2s ease-in-out infinite;
}

.scroll-indicator:hover {
  border-color: var(--color-primary);
  transform: translateY(4px);
}

@keyframes scrollBounce {
  0%, 100% {
      transform: translateY(-6px) rotate(-45deg);
      opacity: 0;
  }
  40% {
      opacity: 1;
  }
  70% {
      transform: translateY(8px) rotate(-45deg);
      opacity: 0;
  }
}

/* 关于我们 */
.about {
  padding: 100px 0;
  background: var(--color-surface);
}

section h2 {
  text-align: center;
  font-size: 2.3rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-primary);
  margin-bottom: 2.5rem;
}

.about-content {
  max-width: 820px;
  margin: 0 auto;
}

.about-text p {
  font-size: 1.05rem;
  text-align: center;
  margin-bottom: 2.8rem;
  color: var(--color-muted);
}

.values {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem;
}

.value-item {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--color-surface-muted);
  border-radius: 16px;
  border: 1px solid rgba(46, 139, 87, 0.08);
}

.value-item h3 {
  color: var(--color-primary);
  margin-bottom: 0.6rem;
  font-size: 1.2rem;
}

/* 业务领域 */
.services {
  padding: 100px 0;
  background: #F2F6F3;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.8rem;
}

.service-card {
  background: var(--color-surface);
  padding: 2.6rem 2.2rem;
  border-radius: 18px;
  text-align: center;
  border: 1px solid rgba(46, 139, 87, 0.08);
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(46, 139, 87, 0.12);
}

.service-icon {
  font-size: 2.6rem;
  margin-bottom: 1.2rem;
}

.service-card h3 {
  color: var(--color-primary);
  margin-bottom: 0.8rem;
  font-size: 1.2rem;
}

/* 行动号召 */
.cta-section {
  padding: 95px clamp(24px, 7vw, 88px);
  background: linear-gradient(120deg, var(--color-primary) 0%, #49B47A 100%);
  color: #fff;
  text-align: center;
}

.cta-section h2 {
  color: #fff;
  font-size: 2.4rem;
  margin-bottom: 1rem;
}

.cta-section p {
  font-size: 1.15rem;
  margin-bottom: 2rem;
  opacity: 0.92;
}

.cta-section .btn {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
}

.cta-section .btn:hover {
  background: rgba(255, 255, 255, 0.85);
}

/* 最新动态 */
.updates {
  padding: 100px 0;
  background: var(--color-surface);
}

.updates-card {
  max-width: 1000px;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 3.5rem);
  text-align: center;
  background: var(--color-surface-muted);
  border-radius: 20px;
  border: 1px solid rgba(46, 139, 87, 0.1);
  box-shadow: 0 20px 45px rgba(46, 139, 87, 0.08);
}

.updates-card p {
  font-size: 1.05rem;
  color: var(--color-muted);
  margin-bottom: 1.2rem;
}

.updates-note {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  background: rgba(46, 139, 87, 0.12);
  color: var(--color-primary);
  font-weight: 500;
}

/* 页脚 */
.footer {
  background: #1F2A37;
  color: #E5EDF4;
  padding: 60px 0 24px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.8rem;
  gap: 2rem;
}

.footer-logo h3 {
  color: #8ED1A5;
  margin-bottom: 0.6rem;
}

.footer-logo p {
  color: rgba(229, 237, 244, 0.7);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: rgba(229, 237, 244, 0.7);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  text-align: center;
  padding-top: 1.8rem;
  border-top: 1px solid rgba(229, 237, 244, 0.12);
  color: rgba(229, 237, 244, 0.65);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-menu {
      display: none;
  }

  .hero {
      padding: 130px 0 100px;
  }

  .hero-container {
      flex-direction: column;
      text-align: center;
      gap: 3rem;
      padding: 0 clamp(24px, 8vw, 72px);
  }

  .hero-content {
      padding-right: 0;
  }

  .hero-illustration {
      width: min(80vw, 420px);
  }

  .logo img {
      height: 36px;
  }

  .logo span {
      font-size: 1.05rem;
  }

  .hero h2 {
      font-size: 2.3rem;
  }

  .cta-buttons {
      justify-content: center;
  }

  .hero-illustration {
      width: min(80vw, 420px);
  }

  .logo img {
      height: 36px;
  }
  .footer-content {
      flex-direction: column;
      text-align: center;
  }

  .footer-links {
      justify-content: center;
  }
}