/* ==========================================
   逆胜科技官方网站 - 主样式表
   四川逆胜科技有限公司
   官网：www.nisheng.com.cn
   主色：#42A5F5 | 辅助色：#FF7D00
   ========================================== */

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  color: #333333;
  background-color: #ffffff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: #42a5f5;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #1e88e5;
}

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

ul,
ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 颜色变量 ===== */
:root {
  --primary-blue: #42a5f5;
  --primary-blue-dark: #1e88e5;
  --primary-blue-light: #e3f2fd;
  --accent-orange: #ff7d00;
  --accent-orange-dark: #e06e00;
  --accent-orange-light: #fff3e6;
  --text-dark: #333333;
  --text-gray: #666666;
  --text-light: #999999;
  --bg-light: #f5f7fa;
  --bg-white: #ffffff;
  --border-color: #e8e8e8;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: all 0.3s ease;
}

/* ===== 顶部导航栏 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--primary-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 18px;
}

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

.logo-text h1 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.2;
}

.logo-text span {
  font-size: 11px;
  color: var(--text-light);
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* 导航菜单 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu > li {
  position: relative;
}

.nav-menu > li > a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--text-dark);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-menu > li > a:hover,
.nav-menu > li > a.active {
  color: var(--primary-blue);
  background: var(--primary-blue-light);
}

/* 下拉菜单 */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: var(--transition);
  z-index: 100;
}

.nav-menu > li:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li a {
  display: block;
  padding: 10px 20px;
  font-size: 14px;
  color: var(--text-dark);
  transition: var(--transition);
}

.dropdown-menu li a:hover {
  color: var(--primary-blue);
  background: var(--primary-blue-light);
}

/* 汉堡菜单按钮 */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px;
  height: 30px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-dark);
  transition: var(--transition);
  border-radius: 2px;
}

.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);
}

/* ===== 页面通用标题 ===== */
.page-banner {
  padding: 120px 0 60px;
  background: linear-gradient(135deg, var(--primary-blue-light), var(--bg-light));
  text-align: center;
}

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

.page-banner p {
  font-size: 16px;
  color: var(--text-gray);
  max-width: 600px;
  margin: 0 auto;
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

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

.section-title p {
  font-size: 16px;
  color: var(--text-gray);
  max-width: 700px;
  margin: 0 auto;
}

/* ===== 按钮样式 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--primary-blue-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(66, 165, 245, 0.3);
}

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

.btn-orange:hover {
  background: var(--accent-orange-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 125, 0, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--primary-blue);
  border: 2px solid var(--primary-blue);
}

.btn-outline:hover {
  background: var(--primary-blue);
  color: #fff;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 14px;
}

/* ===== 首页：轮播Banner ===== */
.hero-slider {
  padding-top: 70px;
  position: relative;
  overflow: hidden;
}

.slider-container {
  position: relative;
  height: 650px;
  max-height: 80vh;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.8s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.slide.active {
  opacity: 1;
}

.slide-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
}

.slide-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 20px;
}

.slide-content h2 {
  font-size: 48px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 20px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

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

/* Banner颜色方案 */
.slide-blue .slide-bg {
  background: linear-gradient(135deg, #0a1628 0%, #1a3a6b 50%, #42a5f5 100%);
}

.slide-gradient .slide-bg {
  background: linear-gradient(135deg, #2d0a0a 0%, #6b2d00 50%, #ff7d00 100%);
}

.slide-dark .slide-bg {
  background: linear-gradient(135deg, #1a0a0a 0%, #2e1518 50%, #3e1518 100%);
}

/* 轮播控制 */
.slider-dots {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}

.slider-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  border: 2px solid rgba(255, 255, 255, 0.6);
  cursor: pointer;
  transition: var(--transition);
}

.slider-dot.active {
  background: #fff;
  border-color: #fff;
  transform: scale(1.2);
}

/* ===== 首页：核心优势 ===== */
.advantages {
  padding: 80px 0;
  background: var(--bg-light);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.advantage-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 36px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.advantage-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--primary-blue-light);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.advantage-card:nth-child(2) .advantage-icon {
  background: var(--accent-orange-light);
}

.advantage-card:nth-child(3) .advantage-icon {
  background: #e8f5e9;
}

.advantage-card:nth-child(4) .advantage-icon {
  background: #fff3e0;
}

.advantage-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
}

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

/* ===== 首页：热门产品 ===== */
.featured-products {
  padding: 80px 0;
}

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

.product-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.product-card-img {
  height: 240px;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  color: var(--primary-blue);
}

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

.product-card-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.product-card-body .price {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-orange);
  margin-bottom: 12px;
}

.product-card-body p {
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.6;
  margin-bottom: 16px;
}

.product-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  border-radius: 20px;
  margin-right: 6px;
  margin-bottom: 6px;
}

.tag-blue {
  background: var(--primary-blue-light);
  color: var(--primary-blue);
}

.tag-orange {
  background: var(--accent-orange-light);
  color: var(--accent-orange);
}

.tag-green {
  background: #e8f5e9;
  color: #2e7d32;
}

/* ===== 首页：招商板块 ===== */
.supplier-cta {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary-blue), #0a2d7a);
  color: #fff;
  text-align: center;
}

.supplier-cta h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
}

.supplier-cta p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  max-width: 700px;
  margin: 0 auto 32px;
  line-height: 1.8;
}

.supplier-cta .btn-wrap {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.supplier-cta .btn-orange {
  background: var(--accent-orange);
  color: #fff;
}

.supplier-cta .btn-outline {
  border-color: #fff;
  color: #fff;
}

.supplier-cta .btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* 合作品类标签 */
.coop-tags {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 24px;
}

.coop-tags span {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.9);
}

/* ===== 首页：场景展示 ===== */
.scenes {
  padding: 80px 0;
  background: var(--bg-light);
}

.scenes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.scene-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 14px;
  position: relative;
  cursor: pointer;
  transition: var(--transition);
}

.scene-item:hover {
  transform: scale(1.03);
}

.scene-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, #e3f2fd, #f5f7fa);
  font-size: 32px;
}

.scene-placeholder span {
  font-size: 14px;
  color: var(--text-gray);
}

/* ===== 底部 ===== */
.footer {
  background: #1a1a2e;
  color: rgba(255, 255, 255, 0.8);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 2fr;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.footer-about p {
  font-size: 14px;
  line-height: 1.8;
  margin-top: 16px;
}

.footer-about .brand-slogan {
  font-size: 16px;
  color: var(--accent-orange);
  font-weight: 600;
  margin-top: 12px;
}

.footer-nav h4,
.footer-qrcode h4 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

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

.footer-nav ul li a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  transition: var(--transition);
}

.footer-nav ul li a:hover {
  color: var(--accent-orange);
  padding-left: 4px;
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

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

.qr-placeholder {
  width: 100px;
  height: 100px;
  background: #2a2a4a;
  border-radius: var(--radius-sm);
  margin: 0 auto 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
}

.qr-item p {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom {
  margin-top: 40px;
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
}

.footer-bottom-inner a {
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom-inner a:hover {
  color: var(--accent-orange);
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

/* ===== 产品页面 ===== */
.product-section {
  padding: 80px 0;
}

.product-section:nth-child(even) {
  background: var(--bg-light);
}

.product-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.product-intro.reverse {
  direction: rtl;
}

.product-intro.reverse > * {
  direction: ltr;
}

.product-info h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.product-info .price-range {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent-orange);
  margin-bottom: 8px;
}

.product-info .target {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary-blue-light);
  color: var(--primary-blue);
  border-radius: 4px;
  font-size: 13px;
  margin-bottom: 16px;
}

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

.product-models {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.model-item {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  text-align: center;
  transition: var(--transition);
}

.model-item:hover {
  border-color: var(--primary-blue);
  background: var(--primary-blue-light);
}

.model-item .model-name {
  font-weight: 700;
  color: var(--text-dark);
  font-size: 14px;
}

.model-item .model-desc {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 4px;
}

/* ===== 智能系统页面 ===== */
.system-section {
  padding: 80px 0;
}

.system-section:nth-child(even) {
  background: var(--bg-light);
}

.system-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.system-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background: var(--bg-white);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.feature-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-blue-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 18px;
}

.feature-text h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 4px;
}

.feature-text p {
  font-size: 13px;
  color: var(--text-gray);
}

/* ===== 供应商合作页面 ===== */
.cooperation-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.flow-step {
  text-align: center;
  padding: 32px 20px;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.flow-step .step-num {
  width: 40px;
  height: 40px;
  background: var(--primary-blue);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  margin: 0 auto 16px;
}

.flow-step h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.flow-step p {
  font-size: 13px;
  color: var(--text-gray);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.benefit-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.benefit-card .benefit-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: var(--accent-orange-light);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.benefit-card h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.benefit-card p {
  font-size: 13px;
  color: var(--text-gray);
}

/* 入驻表单 */
.form-section {
  padding: 80px 0;
  background: var(--bg-light);
}

.supplier-form {
  max-width: 700px;
  margin: 0 auto;
  background: var(--bg-white);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
}

.form-group label .required {
  color: #e53935;
  margin-left: 2px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-dark);
  transition: var(--transition);
  font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(66, 165, 245, 0.1);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-submit {
  width: 100%;
  padding: 14px;
  font-size: 16px;
}

/* ===== 案例页面 ===== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.case-img {
  height: 200px;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
}

.case-body {
  padding: 20px;
}

.case-body .case-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  background: var(--primary-blue-light);
  color: var(--primary-blue);
  border-radius: 4px;
  margin-bottom: 10px;
}

.case-body h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.case-body p {
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.6;
}

/* ===== 技术支持页面 ===== */
.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.support-card {
  padding: 36px 24px;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  text-align: center;
}

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

.support-card .support-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--primary-blue-light);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.support-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
}

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

/* ===== 关于我们页面 ===== */
.about-story {
  padding: 80px 0;
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

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

.about-content p {
  font-size: 15px;
  color: var(--text-gray);
  line-height: 2;
  margin-bottom: 16px;
}

.brand-culture {
  background: linear-gradient(135deg, #0a1628, #1a3a6b);
  color: #fff;
  padding: 80px 0;
  text-align: center;
}

.brand-culture h3 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 20px;
}

.brand-culture .culture-text {
  max-width: 700px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 2.2;
  color: rgba(255, 255, 255, 0.9);
}

.brand-culture .slogan-highlight {
  color: var(--accent-orange);
  font-size: 20px;
  font-weight: 700;
  margin: 20px 0;
}

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

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

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

.contact-item .contact-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-blue-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.contact-item h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 4px;
}

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

.qr-showcase {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.qr-showcase-item {
  text-align: center;
}

.qr-placeholder-sm {
  width: 80px;
  height: 80px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  margin: 0 auto 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: var(--text-light);
  border: 1px dashed var(--border-color);
}

.map-placeholder {
  width: 100%;
  height: 300px;
  background: var(--bg-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 14px;
  border: 1px dashed var(--border-color);
  margin-top: 24px;
}

/* ===== 悬浮客服 ===== */
.float-kefu {
  position: fixed;
  right: 20px;
  bottom: 120px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.float-kefu-item {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  cursor: pointer;
  font-size: 20px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  position: relative;
}

.float-kefu-item:hover {
  transform: scale(1.1);
}

.float-kefu-sales {
  background: var(--primary-blue);
}

.float-kefu-supplier {
  background: var(--accent-orange);
}

.float-kefu-service {
  background: var(--accent-orange);
}

.float-kefu-item .tooltip {
  position: absolute;
  right: 56px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--text-dark);
  color: #fff;
  padding: 6px 12px;
  border-radius: 4px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.float-kefu-item:hover .tooltip {
  opacity: 1;
  visibility: visible;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 60px;
  width: 44px;
  height: 44px;
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 18px;
  color: var(--text-gray);
  box-shadow: var(--shadow-sm);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-blue);
  color: #fff;
  border-color: var(--primary-blue);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

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

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

@media (max-width: 768px) {
  /* 汉堡菜单 */
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--bg-white);
    flex-direction: column;
    align-items: stretch;
    padding: 20px;
    overflow-y: auto;
    transition: left 0.3s ease;
    gap: 0;
  }

  .nav-menu.open {
    left: 0;
  }

  .nav-menu > li > a {
    padding: 14px 16px;
    font-size: 16px;
    border-bottom: 1px solid var(--border-color);
  }

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    padding: 0 0 0 16px;
    display: none;
  }

  .nav-menu > li:hover .dropdown-menu {
    display: block;
  }

  .dropdown-menu li a {
    padding: 10px 16px;
  }

  /* Banner */
  .slider-container {
    height: 400px;
  }

  .slide-content h2 {
    font-size: 28px;
  }

  .slide-content p {
    font-size: 15px;
  }

  /* 网格调整 */
  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .product-cards {
    grid-template-columns: 1fr;
  }

  .product-intro {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .product-intro.reverse {
    direction: ltr;
  }

  .system-card {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

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

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

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

  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  .cooperation-flow {
    grid-template-columns: 1fr;
  }

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

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

  .form-row {
    grid-template-columns: 1fr;
  }

  .supplier-form {
    padding: 24px;
  }

  .section {
    padding: 50px 0;
  }

  .page-banner {
    padding: 100px 0 40px;
  }

  .page-banner h2 {
    font-size: 28px;
  }

  .section-title h2 {
    font-size: 24px;
  }

  .product-models {
    grid-template-columns: 1fr;
  }

  .qrcode-section .qr-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .float-kefu {
    right: 12px;
    bottom: 100px;
  }

  .float-kefu-item {
    width: 42px;
    height: 42px;
    font-size: 18px;
  }
}

@media (max-width: 480px) {
  .slider-container {
    height: 320px;
  }

  .slide-content h2 {
    font-size: 22px;
  }

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

/* ===== 辅助类 ===== */
.text-center {
  text-align: center;
}

.mt-20 {
  margin-top: 20px;
}

.mt-40 {
  margin-top: 40px;
}

.mb-20 {
  margin-bottom: 20px;
}

.mb-40 {
  margin-bottom: 40px;
}

/* ===== 简易后台管理面板 ===== */
.admin-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: #1a1a2e;
  color: #fff;
  padding: 8px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  z-index: 9999;
  display: none;
}

.admin-bar.show {
  display: flex;
}

.admin-bar a {
  color: var(--accent-orange);
}