/* ===== 全局重置 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1a73e8;
  --primary-dark: #0d47a1;
  --primary-light: #4fc3f7;
  --secondary: #00c853;
  --secondary-dark: #009624;
  --accent: #e53935;
  --dark: #0a1628;
  --dark-2: #0d2137;
  --text: #333;
  --text-light: #666;
  --bg-light: #f8faff;
  --bg-section: #f0f7ff;
  --white: #ffffff;
  --shadow: 0 4px 20px rgba(13, 71, 161, 0.1);
  --shadow-hover: 0 8px 35px rgba(13, 71, 161, 0.18);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
  --font: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
}

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

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

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

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

/* ===== 顶部导航栏 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(26, 115, 232, 0.08);
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: 0 2px 30px rgba(0, 0, 0, 0.08);
}

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

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

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 22px;
  font-weight: bold;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-text .company {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark);
  letter-spacing: 1px;
}

.logo-text .tagline {
  font-size: 11px;
  color: var(--primary);
  letter-spacing: 2px;
  font-weight: 500;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  font-size: 15px;
  color: var(--text);
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
  border-radius: 2px;
}

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

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

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

.menu-toggle span {
  width: 26px;
  height: 2.5px;
  background: var(--dark);
  border-radius: 3px;
  transition: var(--transition);
}

/* ===== Hero 区域 ===== */
.hero {
  padding-top: 72px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 50%, var(--dark) 100%);
  overflow: hidden;
}

.hero-bg-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.6;
}

.hero-bg-svg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 22, 40, 0.85) 0%, rgba(13, 33, 55, 0.7) 100%);
  z-index: 1;
}

.hero .container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
}

.hero-content h1 {
  font-size: 44px;
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-content h1 .highlight {
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content .subtitle {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 540px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: var(--font);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  box-shadow: 0 4px 15px rgba(26, 115, 232, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(26, 115, 232, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255, 255, 255, 0.25);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(26, 115, 232, 0.15);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

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

.hero-stat-item .number {
  font-size: 32px;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
}

.hero-stat-item .number .plus {
  color: var(--secondary);
  font-size: 24px;
}

.hero-stat-item .label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 6px;
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-visual img {
  width: 100%;
  max-width: 520px;
  border-radius: var(--radius-lg);
}

/* ===== 通用区块样式 ===== */
.section {
  padding: 100px 0;
}

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

.section-header .section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: rgba(26, 115, 232, 0.08);
  padding: 6px 18px;
  border-radius: 50px;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 16px;
}

.section-header p {
  font-size: 16px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== 关于我们 ===== */
.about {
  background: var(--white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-image {
  position: relative;
}

.about-image img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.about-image .experience-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  padding: 20px 28px;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow-hover);
}

.experience-badge .number {
  font-size: 36px;
  font-weight: 800;
  line-height: 1;
}

.experience-badge .text {
  font-size: 13px;
  opacity: 0.9;
  margin-top: 4px;
}

.about-text h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 20px;
}

.about-text p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 16px;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 24px;
}

.about-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
}

.about-feature-item .icon {
  width: 24px;
  height: 24px;
  background: rgba(26, 115, 232, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 14px;
  flex-shrink: 0;
}

/* ===== 业务范围 ===== */
.business {
  background: var(--bg-light);
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.business-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
  border: 1px solid rgba(26, 115, 232, 0.06);
}

.business-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(26, 115, 232, 0.15);
}

.business-card .card-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.business-card .card-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.business-card h4 {
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}

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

/* ===== 核心优势 ===== */
.advantages {
  background: var(--white);
}

.advantages-bg-wrap {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
  border-radius: var(--radius-lg);
  padding: 60px;
  position: relative;
  overflow: hidden;
}

.advantages-bg-wrap::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(26, 115, 232, 0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.advantages-bg-wrap .section-header h2 {
  color: var(--white);
}

.advantages-bg-wrap .section-header p {
  color: rgba(255, 255, 255, 0.6);
}

.advantages-bg-wrap .section-tag {
  background: rgba(255, 255, 255, 0.1);
  color: var(--primary-light);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
  z-index: 1;
}

.advantage-item {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}

.advantage-item:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(26, 115, 232, 0.3);
  transform: translateY(-4px);
}

.advantage-item .icon {
  font-size: 36px;
  margin-bottom: 16px;
  display: block;
}

.advantage-item h5 {
  font-size: 18px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 10px;
}

.advantage-item p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

/* ===== 团队与服务 ===== */
.team-section {
  background: var(--bg-light);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.team-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.team-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.team-card-img {
  height: 200px;
  overflow: hidden;
  background: var(--bg-section);
  display: flex;
  align-items: center;
  justify-content: center;
}

.team-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.team-card-body {
  padding: 28px;
}

.team-card-body h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}

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

/* ===== 合作机构 ===== */
.partners {
  background: var(--white);
}

.partner-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
  padding: 20px 0;
}

.partner-item {
  padding: 16px 32px;
  background: var(--bg-light);
  border-radius: var(--radius);
  border: 1px solid rgba(26, 115, 232, 0.06);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
  transition: var(--transition);
  white-space: nowrap;
}

.partner-item:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(26, 115, 232, 0.04);
}

/* ===== 联系我们 ===== */
.contact {
  background: var(--bg-light);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.contact-image {
  position: relative;
}

.contact-image img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

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

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-item .icon-wrap {
  width: 48px;
  height: 48px;
  background: rgba(26, 115, 232, 0.08);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.contact-item .info-label {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 4px;
}

.contact-item .info-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--dark);
}

/* ===== 页脚 ===== */
.footer {
  background: var(--dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 24px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand .logo .logo-icon {
  width: 36px;
  height: 36px;
  font-size: 18px;
}

.footer-brand .logo .company {
  color: var(--white);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  max-width: 320px;
}

.footer-col h5 {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  padding: 4px 0;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .hero-content h1 {
    font-size: 34px;
  }

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content .subtitle {
    margin: 0 auto 32px;
  }

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

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

  .hero-visual {
    display: none;
  }

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

  .business-grid,
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 20px 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    gap: 16px;
  }

  .nav.open {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .section {
    padding: 60px 0;
  }

  .section-header h2 {
    font-size: 28px;
  }

  .hero-content h1 {
    font-size: 28px;
  }

  .hero-stats {
    gap: 24px;
    flex-wrap: wrap;
  }

  .hero-stat-item .number {
    font-size: 24px;
  }

  .business-grid,
  .advantages-grid,
  .team-grid {
    grid-template-columns: 1fr;
  }

  .advantages-bg-wrap {
    padding: 40px 24px;
    border-radius: var(--radius);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

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

  .btn {
    padding: 12px 24px;
    font-size: 14px;
  }

  .contact-image {
    display: none;
  }
}

@media (max-width: 480px) {
  .logo-text .company {
    font-size: 15px;
  }

  .hero-content h1 {
    font-size: 24px;
  }

  .hero-stat-item .label {
    font-size: 11px;
  }

  .partner-logos {
    gap: 12px;
  }

  .partner-item {
    padding: 10px 16px;
    font-size: 12px;
  }
}