/* ========================================
   企业网站全局样式 — 现代、简洁、响应式
   ======================================== */

/* --- CSS 变量 --- */
:root {
  --primary: #1e3a5f;
  --primary-light: #2c5282;
  --accent: #3182ce;
  --accent-hover: #2b6cb0;
  --gold: #d69e2e;
  --gold-hover: #b7791f;
  --dark: #1a202c;
  --text: #4a5568;
  --text-light: #718096;
  --bg: #ffffff;
  --bg-light: #f7fafc;
  --bg-gray: #edf2f7;
  --border: #e2e8f0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --header-height: 260px;
  --transition: 0.25s ease;
}

/* --- 重置 & 基础 --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul {
  list-style: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  text-align: center;
  line-height: 1.4;
}

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

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

.btn-outline {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn-outline:hover {
  background: var(--accent);
  color: #fff;
}

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

.btn-gold:hover {
  background: var(--gold-hover);
  border-color: var(--gold-hover);
  color: #fff;
}

/* --- 页头导航 --- */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #fff;
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
}

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

.logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-img {
  height: 250px;
  width: auto;
  object-fit: contain;
}

/* 语言切换 */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 20px;
  font-size: 13px;
  font-weight: 500;
  flex-shrink: 0;
}

.lang-switch a {
  padding: 4px 8px;
  border-radius: 4px;
  color: var(--text-light);
}

.lang-switch a.active,
.lang-switch a:hover {
  color: var(--accent);
  background: var(--bg-gray);
}

.lang-switch span {
  color: var(--border);
  user-select: none;
}

/* 导航列项 */
.nav-list {
  display: flex;
  gap: 8px;
}

.nav-list a {
  display: block;
  padding: 8px 16px;
  color: var(--text);
  font-weight: 500;
  font-size: 15px;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--accent);
  background: var(--bg-gray);
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- 页脚 --- */
.footer {
  background: var(--dark);
  color: #cbd5e0;
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer h3 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer p {
  font-size: 14px;
  line-height: 1.8;
}

.footer a {
  color: #cbd5e0;
  font-size: 14px;
}

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

.footer ul li {
  margin-bottom: 10px;
}

.footer-bottom {
  border-top: 1px solid #2d3748;
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: #718096;
}

/* --- 版块标题 --- */
.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: 32px;
  color: var(--dark);
  margin-bottom: 12px;
  font-weight: 700;
}

.section-title p {
  font-size: 17px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* --- 版块间距 --- */
.section {
  padding: 80px 0;
}

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

/* --- Hero 横幅 --- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #2a4a6b 100%);
  color: #fff;
  padding: 100px 0 120px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 50%;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 650px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero p {
  font-size: 18px;
  line-height: 1.8;
  opacity: 0.9;
  margin-bottom: 32px;
  color: rgba(255, 255, 255, 0.85);
}

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

/* Hero 图片滚动画廊 */
.hero-wrapper {
  display: flex;
  align-items: center;
  gap: 40px;
}

.hero-wrapper .hero-content {
  flex: 0 0 auto;
  max-width: 520px;
}

.hero-gallery {
  flex: 1;
  overflow: hidden;
  position: relative;
  height: 280px;
  mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.hero-gallery-track {
  display: flex;
  gap: 16px;
  height: 100%;
  animation: scroll-left 30s linear infinite;
  width: max-content;
}

.hero-gallery-track img {
  height: 100%;
  width: auto;
  border-radius: var(--radius);
  object-fit: cover;
  flex-shrink: 0;
}

@keyframes scroll-left {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* --- 特色卡片 --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: #fff;
  padding: 36px 28px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--bg-gray);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.feature-card h3 {
  font-size: 18px;
  color: var(--dark);
  margin-bottom: 10px;
  font-weight: 600;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
}

/* --- 服务卡片 --- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.service-card {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.service-card-image {
  height: 200px;
  background: var(--bg-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
}

.service-card-body {
  padding: 24px;
}

.service-card-body h3 {
  font-size: 20px;
  color: var(--dark);
  margin-bottom: 10px;
  font-weight: 600;
}

.service-card-body p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* --- CTA 横幅 --- */
.cta-section {
  background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
  color: #fff;
  text-align: center;
  padding: 72px 0;
}

.cta-section h2 {
  font-size: 32px;
  margin-bottom: 12px;
  font-weight: 700;
}

.cta-section p {
  font-size: 17px;
  opacity: 0.9;
  margin-bottom: 28px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* --- 关于页面 --- */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-image {
  background: var(--bg-gray);
  border-radius: var(--radius-lg);
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
}

.about-text h2 {
  font-size: 32px;
  color: var(--dark);
  margin-bottom: 16px;
}

.about-text p {
  margin-bottom: 16px;
  line-height: 1.8;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 32px;
}

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

.value-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  background: var(--bg-gray);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.value-item h4 {
  font-size: 15px;
  color: var(--dark);
  margin-bottom: 6px;
}

.value-item p {
  font-size: 13px;
  color: var(--text-light);
}

/* 团队卡片 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-card {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  text-align: center;
  padding-bottom: 24px;
  overflow: hidden;
  transition: transform var(--transition);
}

.team-card:hover {
  transform: translateY(-4px);
}

.team-avatar {
  height: 200px;
  background: var(--bg-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  margin-bottom: 16px;
}

.team-card h3 {
  font-size: 17px;
  color: var(--dark);
  margin-bottom: 4px;
}

.team-card .role {
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
}

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

.contact-info h2 {
  font-size: 28px;
  color: var(--dark);
  margin-bottom: 12px;
}

.contact-info > p {
  margin-bottom: 28px;
  color: var(--text-light);
}

.contact-detail {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.contact-detail-icon {
  width: 44px;
  height: 44px;
  background: var(--bg-gray);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.contact-detail h4 {
  font-size: 15px;
  color: var(--dark);
  margin-bottom: 2px;
}

.contact-detail p {
  font-size: 14px;
  color: var(--text-light);
}

/* 表单 */
.contact-form {
  background: #fff;
  padding: 36px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.contact-form h3 {
  font-size: 20px;
  color: var(--dark);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--dark);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  color: var(--dark);
  transition: border-color var(--transition), box-shadow var(--transition);
  background: var(--bg);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
}

.form-group input.error,
.form-group textarea.error {
  border-color: #e53e3e;
  box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.1);
}

.error-message {
  color: #e53e3e;
  font-size: 13px;
  margin-top: 4px;
  display: none;
}

.form-group .error-message.show {
  display: block;
}

.form-success {
  display: none;
  text-align: center;
  padding: 40px 20px;
}

.form-success.show {
  display: block;
}

.form-success .success-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.form-success h3 {
  color: #38a169;
  margin-bottom: 8px;
}

.form-success p {
  color: var(--text-light);
}

/* --- 页面横幅（子页通用） --- */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, #2a4a6b 100%);
  color: #fff;
  padding: 60px 0;
  text-align: center;
}

.page-hero h1 {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 10px;
}

.page-hero p {
  font-size: 17px;
  opacity: 0.85;
}

/* --- 响应式 --- */
@media (max-width: 900px) {
  .menu-toggle {
    display: flex;
  }

  .nav-list {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
  }

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

  .nav-list a {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-list li:last-child a {
    border-bottom: none;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero p {
    font-size: 16px;
  }

  .hero-wrapper {
    flex-direction: column;
    gap: 24px;
  }

  .hero-wrapper .hero-content {
    max-width: 100%;
  }

  .hero-gallery {
    width: 100%;
    height: 180px;
  }

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

  .about-intro {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-image {
    height: 280px;
  }

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

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

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

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

@media (max-width: 540px) {
  .features-grid,
  .services-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .section-title h2 {
    font-size: 26px;
  }

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

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

  .hero-buttons .btn {
    width: 100%;
    justify-content: center;
  }
}