/* ==================== 全局样式 ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #e74c3c;
  --primary-dark: #c0392b;
  --secondary-color: #3498db;
  --success-color: #27ae60;
  --warning-color: #f39c12;
  --danger-color: #e74c3c;
  --dark-color: #2c3e50;
  --light-color: #ecf0f1;
  --gray-color: #95a5a6;
  --white: #ffffff;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 5px 20px rgba(0, 0, 0, 0.15);
}

body {
  font-family: 'Microsoft YaHei', 'PingFang SC', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  color: var(--dark-color);
  background-color: #f5f6fa;
}

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

ul {
  list-style: none;
}

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

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

/* ==================== 头部导航 ==================== */
.header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: var(--white);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow);
}

.header-top {
  background: rgba(0, 0, 0, 0.1);
  padding: 8px 0;
  font-size: 14px;
}

.header-top-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.contact-info span {
  margin-right: 20px;
}

.contact-info i {
  margin-right: 5px;
}

.header-main {
  padding: 15px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo-icon {
  font-size: 40px;
}

.logo-text h1 {
  font-size: 28px;
  font-weight: bold;
  letter-spacing: 2px;
}

.logo-text p {
  font-size: 12px;
  opacity: 0.9;
}

.nav ul {
  display: flex;
  gap: 5px;
}

.nav a {
  display: block;
  padding: 12px 25px;
  color: var(--white);
  border-radius: 5px;
  transition: all 0.3s ease;
  font-weight: 500;
}

.nav a:hover,
.nav a.active {
  background: rgba(255, 255, 255, 0.2);
}

/* ==================== 汉堡菜单 ==================== */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 25px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.menu-toggle span {
  width: 100%;
  height: 3px;
  background: var(--white);
  border-radius: 3px;
  transition: all 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

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

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* ==================== Banner ==================== */
.banner {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--white);
  padding: 60px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
  animation: pulse 15s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.banner-content {
  position: relative;
  z-index: 1;
}

.banner h2 {
  font-size: 48px;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.banner p {
  font-size: 20px;
  opacity: 0.9;
  margin-bottom: 30px;
}

.banner-tags {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
}

.banner-tags span {
  background: rgba(255, 255, 255, 0.2);
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 14px;
}

/* ==================== 特色区域 ==================== */
.features {
  padding: 60px 0;
  background: var(--white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.feature-item {
  text-align: center;
  padding: 30px 20px;
  border-radius: 10px;
  background: var(--light-color);
  transition: all 0.3s ease;
}

.feature-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.feature-icon {
  font-size: 50px;
  margin-bottom: 15px;
}

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

.feature-item p {
  font-size: 14px;
  color: var(--gray-color);
}

/* ==================== 产品报价表 ==================== */
.products-section {
  padding: 60px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 40px;
}

.section-title h2 {
  font-size: 32px;
  color: var(--dark-color);
  margin-bottom: 10px;
}

.section-title p {
  color: var(--gray-color);
  font-size: 16px;
}

.products-filter {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 10px 25px;
  border: 2px solid var(--primary-color);
  background: transparent;
  color: var(--primary-color);
  border-radius: 25px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--primary-color);
  color: var(--white);
}

.products-table-container {
  background: var(--white);
  border-radius: 15px;
  box-shadow: var(--shadow);
  overflow-x: auto;
}

.products-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

.products-table th {
  background: var(--dark-color);
  color: var(--white);
  padding: 18px 15px;
  text-align: left;
  font-weight: 600;
  font-size: 14px;
}

.products-table td {
  padding: 15px;
  border-bottom: 1px solid var(--light-color);
  font-size: 14px;
}

.products-table tbody tr:hover {
  background: #f8f9fa;
}

.products-table tbody tr:last-child td {
  border-bottom: none;
}

.product-name {
  font-weight: 600;
  color: var(--dark-color);
}

.product-category {
  display: inline-block;
  padding: 4px 12px;
  background: var(--light-color);
  border-radius: 15px;
  font-size: 12px;
  color: var(--gray-color);
}

.price-current {
  color: var(--primary-color);
  font-weight: bold;
  font-size: 18px;
}

.price-original {
  color: var(--gray-color);
  text-decoration: line-through;
  font-size: 14px;
  margin-left: 8px;
}

.price-discount {
  display: inline-block;
  padding: 3px 8px;
  background: var(--danger-color);
  color: var(--white);
  border-radius: 4px;
  font-size: 12px;
  margin-left: 8px;
}

.stock-status {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 15px;
  font-size: 12px;
}

.stock-status.in-stock {
  background: #d4edda;
  color: var(--success-color);
}

.stock-status.low-stock {
  background: #fff3cd;
  color: var(--warning-color);
}

.stock-status.out-stock {
  background: #f8d7da;
  color: var(--danger-color);
}

.featured-badge {
  display: inline-block;
  padding: 3px 8px;
  background: var(--warning-color);
  color: var(--white);
  border-radius: 4px;
  font-size: 12px;
  margin-left: 5px;
}

/* ==================== 关于我们 ==================== */
.about-section {
  padding: 60px 0;
  background: var(--white);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.about-text h2 {
  font-size: 32px;
  color: var(--dark-color);
  margin-bottom: 20px;
}

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

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 30px;
}

.stat-item {
  text-align: center;
  padding: 20px;
  background: var(--light-color);
  border-radius: 10px;
}

.stat-number {
  font-size: 36px;
  font-weight: bold;
  color: var(--primary-color);
}

.stat-label {
  font-size: 14px;
  color: var(--gray-color);
  margin-top: 5px;
}

.about-image {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  border-radius: 15px;
  padding: 60px;
  text-align: center;
  color: var(--white);
}

.about-image h3 {
  font-size: 48px;
  margin-bottom: 10px;
}

.about-image p {
  font-size: 18px;
}

/* ==================== 联系我们 ==================== */
.contact-section {
  padding: 60px 0;
}

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

.contact-info-card {
  background: var(--white);
  padding: 40px;
  border-radius: 15px;
  box-shadow: var(--shadow);
}

.contact-info-card h3 {
  font-size: 24px;
  color: var(--dark-color);
  margin-bottom: 30px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 25px;
}

.contact-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 20px;
  flex-shrink: 0;
}

.contact-details h4 {
  font-size: 16px;
  color: var(--dark-color);
  margin-bottom: 5px;
}

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

.contact-form-card {
  background: var(--white);
  padding: 40px;
  border-radius: 15px;
  box-shadow: var(--shadow);
}

.contact-form-card h3 {
  font-size: 24px;
  color: var(--dark-color);
  margin-bottom: 30px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--dark-color);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid var(--light-color);
  border-radius: 8px;
  font-size: 14px;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

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

.btn {
  display: inline-block;
  padding: 12px 30px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: var(--white);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

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

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

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

/* ==================== 页脚 ==================== */
.footer {
  background: var(--dark-color);
  color: var(--white);
  padding: 50px 0 20px;
}

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

.footer-about h3 {
  font-size: 24px;
  margin-bottom: 15px;
}

.footer-about p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}

.footer-links h4,
.footer-contact h4 {
  font-size: 18px;
  margin-bottom: 20px;
}

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

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.3s ease;
}

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

.footer-contact p {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 10px;
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.5);
  font-size: 14px;
}

/* ==================== 遮罩层 ==================== */
.nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
}

.nav-overlay.active {
  display: block;
}

/* ==================== 加载动画 ==================== */
.loading {
  text-align: center;
  padding: 50px;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--light-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ==================== 提示消息 ==================== */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 15px 25px;
  border-radius: 8px;
  color: var(--white);
  font-weight: 500;
  z-index: 9999;
  animation: slideIn 0.3s ease;
}

.toast.success {
  background: var(--success-color);
}

.toast.error {
  background: var(--danger-color);
}

.toast.warning {
  background: var(--warning-color);
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 992px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .about-content {
    grid-template-columns: 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  /* 头部 */
  .header-top {
    display: none;
  }
  
  .header-main {
    padding: 10px 0;
  }
  
  .header-content {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    position: relative;
  }
  
  .logo {
    gap: 10px;
  }
  
  .logo-icon {
    font-size: 30px;
  }
  
  .logo-text h1 {
    font-size: 20px;
    letter-spacing: 1px;
  }
  
  .logo-text p {
    font-size: 10px;
  }
  
  /* 汉堡菜单 */
  .menu-toggle {
    display: flex;
  }
  
  /* 导航菜单 */
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 280px;
    height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 80px 20px 30px;
    transition: right 0.3s ease;
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.2);
    z-index: 1000;
  }
  
  .nav.active {
    right: 0;
  }
  
  .nav ul {
    flex-direction: column;
    gap: 0;
  }
  
  .nav a {
    padding: 15px 20px;
    font-size: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  /* Banner */
  .banner {
    padding: 40px 15px;
  }
  
  .banner h2 {
    font-size: 24px;
    margin-bottom: 15px;
  }
  
  .banner p {
    font-size: 14px;
    margin-bottom: 20px;
  }
  
  .banner-tags {
    gap: 8px;
  }
  
  .banner-tags span {
    padding: 6px 12px;
    font-size: 12px;
  }
  
  /* 特色区域 */
  .features {
    padding: 40px 0;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  
  .feature-item {
    padding: 20px 12px;
  }
  
  .feature-icon {
    font-size: 32px;
    margin-bottom: 8px;
  }
  
  .feature-item h3 {
    font-size: 14px;
    margin-bottom: 5px;
  }
  
  .feature-item p {
    font-size: 12px;
    line-height: 1.4;
  }
  
  /* 产品区域 */
  .products-section {
    padding: 40px 0;
  }
  
  .section-title {
    margin-bottom: 25px;
  }
  
  .section-title h2 {
    font-size: 22px;
  }
  
  .section-title p {
    font-size: 14px;
  }
  
  .products-table-container {
    border-radius: 10px;
    margin: 0 -15px;
    border-radius: 0;
  }
  
  .products-table th {
    padding: 12px 10px;
    font-size: 12px;
  }
  
  .products-table td {
    padding: 10px 8px;
    font-size: 12px;
  }
  
  .price-current {
    font-size: 15px;
  }
  
  .price-original {
    font-size: 11px;
    display: block;
    margin-left: 0;
    margin-top: 2px;
  }
  
  .price-discount {
    font-size: 10px;
    padding: 2px 5px;
    margin-left: 0;
    margin-top: 3px;
    display: inline-block;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 14px;
  }
  
  /* 关于我们 */
  .about-section {
    padding: 40px 0;
  }
  
  .about-text h2 {
    font-size: 22px;
    margin-bottom: 15px;
  }
  
  .about-text p {
    font-size: 14px;
    margin-bottom: 12px;
  }
  
  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 20px;
  }
  
  .stat-item {
    padding: 15px 8px;
  }
  
  .stat-number {
    font-size: 22px;
  }
  
  .stat-label {
    font-size: 11px;
  }
  
  .about-image {
    padding: 35px 20px;
    margin-top: 20px;
  }
  
  .about-image h3 {
    font-size: 32px;
  }
  
  .about-image p {
    font-size: 14px;
  }
  
  /* 页脚 */
  .footer {
    padding: 30px 0 15px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 20px;
    text-align: center;
    margin-bottom: 15px;
  }
  
  .footer-about h3 {
    font-size: 18px;
    margin-bottom: 8px;
  }
  
  .footer-about p {
    font-size: 13px;
  }
  
  .footer-links h4,
  .footer-contact h4 {
    font-size: 15px;
    margin-bottom: 10px;
  }
  
  .footer-links ul li {
    margin-bottom: 6px;
  }
  
  .footer-links a {
    font-size: 13px;
  }
  
  .footer-contact p {
    font-size: 13px;
    margin-bottom: 6px;
  }
  
  .footer-bottom {
    padding-top: 12px;
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }
  
  .logo-icon {
    font-size: 26px;
  }
  
  .logo-text h1 {
    font-size: 18px;
  }
  
  .logo-text p {
    font-size: 9px;
  }
  
  .banner {
    padding: 30px 12px;
  }
  
  .banner h2 {
    font-size: 20px;
  }
  
  .banner p {
    font-size: 13px;
  }
  
  .banner-tags span {
    padding: 5px 10px;
    font-size: 11px;
  }
  
  .features {
    padding: 30px 0;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  
  .feature-item {
    padding: 15px 10px;
  }
  
  .feature-icon {
    font-size: 28px;
  }
  
  .feature-item h3 {
    font-size: 13px;
  }
  
  .feature-item p {
    font-size: 11px;
  }
  
  .section-title h2 {
    font-size: 18px;
  }
  
  .products-table {
    min-width: 500px;
    font-size: 11px;
  }
  
  .about-stats {
    gap: 8px;
  }
  
  .stat-item {
    padding: 12px 6px;
  }
  
  .stat-number {
    font-size: 18px;
  }
  
  .stat-label {
    font-size: 10px;
  }
}