/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 中国红 - 主色 */
  --primary: #C41E1E;
  --primary-dark: #9B1A1A;
  --primary-light: #D94040;
  --primary-bg: #FFF0F0;
  /* 金黄色 - 点缀色 */
  --gold: #D4A84B;
  --gold-light: #F5E6C8;
  --gold-dark: #B8922E;
  /* 电信蓝 - 辅助色 */
  --blue: #0055A5;
  --blue-light: #E8F0FE;
  --blue-dark: #003D7A;
  /* 基础色 */
  --text-dark: #1a1a1a;
  --text-gray: #666;
  --text-light: #999;
  --bg-light: #FFF8F0;
  --bg-white: #ffffff;
  --border: #e8e0d8;
  --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, sans-serif;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

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

ul { list-style: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}

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

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

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

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

.logo-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 2px;
}

.logo-subtitle {
  font-size: 10px;
  color: var(--text-light);
  letter-spacing: 3px;
  text-transform: uppercase;
}

.nav-list {
  display: flex;
  gap: 4px;
}

.nav-link {
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-gray);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: var(--primary-bg);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  max-height: 800px;
  margin-top: 72px;
  overflow: hidden;
}

.hero-slider {
  position: relative;
  height: 100%;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.8s ease;
}

.slide.active {
  opacity: 1;
}

.hero-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 60px;
}

.hero-text {
  flex: 1;
  max-width: 520px;
}

.hero-text h1 {
  font-size: 48px;
  font-weight: 700;
  color: white;
  line-height: 1.2;
  margin-bottom: 20px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.hero-text p {
  font-size: 16px;
  color: rgba(255,255,255,0.9);
  line-height: 1.8;
  margin-bottom: 32px;
}

.hero-image {
  flex: 1;
  max-width: 480px;
  animation: float 6s ease-in-out infinite;
}

.hero-image img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.slider-controls {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}

.slider-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.5);
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
}

.slider-dot.active {
  width: 32px;
  border-radius: 5px;
  background: white;
  border-color: white;
}

.slider-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(8px);
  color: white;
  font-size: 18px;
  cursor: pointer;
  transition: var(--transition);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slider-arrow:hover {
  background: rgba(255,255,255,0.3);
}

.slider-arrow.prev { left: 24px; }
.slider-arrow.next { right: 24px; }

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

.btn-primary {
  background: white;
  color: var(--primary);
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.btn-submit {
  background: var(--primary);
  color: white;
  padding: 14px 40px;
}

.btn-submit:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(196, 30, 30, 0.3);
}

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

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

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-gray);
  max-width: 500px;
  margin: 0 auto;
}

/* ===== About ===== */
.about {
  background: var(--bg-light);
}

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

.about-image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-image-wrapper img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.about-experience {
  position: absolute;
  bottom: -20px;
  right: -20px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 8px 30px rgba(212, 168, 75, 0.4);
}

.exp-number {
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
}

.exp-text {
  font-size: 12px;
  opacity: 0.9;
  margin-top: 4px;
}

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

.about-text p {
  font-size: 15px;
  color: var(--text-gray);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 32px;
}

.stat-item {
  text-align: center;
  padding: 20px 12px;
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border-top: 3px solid var(--primary);
}

.stat-number {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 12px;
  color: var(--text-gray);
  margin-top: 4px;
}

/* ===== Business ===== */
.business {
  background: linear-gradient(135deg, #FFF8F0 0%, #FFF0F0 100%);
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.business-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border);
  opacity: 0;
  transform: translateY(30px);
}

.business-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.business-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--gold);
}

.business-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--gold-light), #FFF0F0);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  padding: 14px;
}

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

.business-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--primary);
}

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

.business-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--blue);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.business-link:hover {
  gap: 10px;
}

/* ===== Advantages ===== */
.advantages {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--blue));
  color: white;
}

.advantages .section-tag {
  color: var(--gold-light);
}

.advantages .section-header h2 {
  color: white;
}

.advantages .section-desc {
  color: rgba(255,255,255,0.7);
}

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

.advantage-card {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  padding: 36px 24px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.advantage-card:hover {
  background: rgba(255,255,255,0.18);
  transform: translateY(-4px);
}

.advantage-number {
  font-size: 48px;
  font-weight: 800;
  color: rgba(255,255,255,0.06);
  position: absolute;
  top: 8px;
  right: 12px;
  line-height: 1;
}

.advantage-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 24px;
}

.advantage-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}

.advantage-card p {
  font-size: 13px;
  color: rgba(255,255,255,0.75);
  line-height: 1.7;
}

/* ===== News ===== */
.news {
  background: var(--bg-light);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.news-card {
  background: white;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.news-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.news-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.news-card:hover .news-image img {
  transform: scale(1.05);
}

.news-category {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 14px;
  font-size: 12px;
  font-weight: 500;
  background: var(--primary);
  color: white;
  border-radius: 20px;
}

.news-body {
  padding: 20px;
}

.news-meta {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 10px;
}

.news-meta i {
  margin-right: 4px;
}

.news-body h3 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-body p {
  font-size: 13px;
  color: var(--text-gray);
  line-height: 1.7;
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--blue);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.news-link:hover {
  gap: 10px;
}

/* ===== Contact ===== */
.contact {
  background: linear-gradient(135deg, #FFF8F0 0%, #FFF0F0 100%);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

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

.contact-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--gold));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
}

.contact-detail h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

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

.contact-form {
  background: white;
  padding: 36px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border-top: 4px solid var(--gold);
}

.form-group {
  margin-bottom: 16px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  transition: var(--transition);
  background: var(--bg-light);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--gold);
  background: white;
  box-shadow: 0 0 0 4px rgba(212, 168, 75, 0.1);
}

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

/* ===== Footer ===== */
.footer {
  background: linear-gradient(135deg, #1a0a0a, #2a0a0a, #0a1a2a);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-logo img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.footer-logo span {
  font-size: 20px;
  font-weight: 700;
  color: var(--gold);
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.8;
  max-width: 360px;
}

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  font-size: 18px;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--gold);
  color: white;
}

.footer-links h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--gold-light);
  margin-bottom: 20px;
}

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

.footer-links ul li a {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.footer-links ul li a:hover {
  color: var(--gold);
  padding-left: 4px;
}

.qrcode-placeholder {
  width: 120px;
  height: 120px;
  border: 2px dashed rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: rgba(255,255,255,0.3);
  margin-top: 12px;
}

.qrcode-placeholder p {
  font-size: 10px;
  margin-top: 8px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  font-size: 12px;
}

.footer-bottom a {
  color: var(--gold-light);
}

.footer-bottom a:hover {
  text-decoration: underline;
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--gold));
  color: white;
  border: none;
  font-size: 16px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(196, 30, 30, 0.3);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 999;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(196, 30, 30, 0.4);
}

/* ===== Decorative Divider ===== */
.section-divider {
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--gold), var(--blue));
  opacity: 0.3;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-text h1 { font-size: 40px; }
  .business-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-content { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transform: translateY(-100%);
    opacity: 0;
    transition: var(--transition);
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-list {
    flex-direction: column;
    gap: 4px;
  }

  .nav-link {
    display: block;
    padding: 12px 16px;
    font-size: 16px;
  }

  .hamburger { display: flex; }

  .hero-content {
    flex-direction: column;
    text-align: center;
    justify-content: center;
    gap: 30px;
  }

  .hero-text { max-width: 100%; }
  .hero-text h1 { font-size: 32px; }
  .hero-image { max-width: 300px; }
  .slider-arrow { display: none; }

  .section { padding: 60px 0; }
  .section-header h2 { font-size: 28px; }
  .section-header { margin-bottom: 40px; }

  .about-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .about-experience {
    width: 100px;
    height: 100px;
    bottom: -10px;
    right: -10px;
  }

  .exp-number { font-size: 24px; }

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

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

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

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

  .contact-form {
    padding: 24px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

@media (max-width: 480px) {
  .hero-text h1 { font-size: 28px; }
  .hero-text p { font-size: 14px; }
  .hero { max-height: 600px; }
}