/* ==========================================================================
   1. 变量声明与基础重置 (Variables & Reset)
   ========================================================================== */
:root {
  /* 品牌色彩系统 - 严守高奢与信赖感 */
  --primary-color: #0052D4;       /* 深邃矿泉蓝：代表专业、纯净、安全 */
  --secondary-color: #4364F7;     /* 纯净冰山青：代表现代、高效、活力 */
  --accent-color: #F5A623;        /* 朝阳金：关键行动按钮（CTA），醒目且具说服力 */
  --accent-hover: #DDA01F;        /* 朝阳金悬停色 */
  --dark-color: #1E293B;          /* 极深蓝黑：用于主要文字 */
  --light-color: #F8FAFC;         /* 浅灰白：用于区块交替背景 */
  --text-muted: #64748B;          /* 哑光灰：用于副标题与描述文字 */
  --white: #FFFFFF;
  
  /* 阴影与圆角 */
  --shadow-sm: 0 2px 4px rgba(0, 82, 212, 0.05);
  --shadow-md: 0 10px 30px rgba(0, 82, 212, 0.08);
  --shadow-lg: 0 20px 40px rgba(0, 82, 212, 0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  
  /* 字体系统 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
  
  /* 过渡效果 */
  --transition-fast: all 0.2s ease;
  --transition-normal: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth; /* 锚点平滑滚动 */
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--dark-color);
  background-color: var(--white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
}

/* ==========================================================================
   2. 通用布局与组件 (Common Utilities & Components)
   ========================================================================== */
.container {
  width: 100%;
  padding-right: 1.25rem;
  padding-left: 1.25rem;
  margin-right: auto;
  margin-left: auto;
}

/* 留白与呼吸感控制 */
.section {
  padding: 4.5rem 0;
  position: relative;
}

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

/* 渐变文本 */
.text-gradient {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 统一的区块标题设计（低视觉阻力，强可读性） */
.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--secondary-color);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 0.75rem;
  padding: 0.25rem 1rem;
  background-color: rgba(67, 100, 247, 0.08);
  border-radius: 50px;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* 按钮组件：悬停动态反馈 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  padding: 0.875rem 2rem;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition-normal);
  text-align: center;
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(245, 166, 35, 0.3);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-3px) scale(1.05); /* 放大 1.05 倍点击反馈 */
  box-shadow: 0 8px 25px rgba(245, 166, 35, 0.45);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
  background-color: rgba(0, 82, 212, 0.05);
  transform: translateY(-3px) scale(1.05);
}

.btn-icon {
  margin-left: 0.5rem;
}

/* ==========================================================================
   3. 吸顶导航栏 (Header Section)
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

.header.scrolled {
  padding: 0.5rem 0;
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

/* 纯文字设计感Logo */
.logo {
  display: flex;
  align-items: center;
  font-weight: 900;
  font-size: 1.4rem;
  letter-spacing: 1px;
}

.logo .brand-icon {
  color: var(--primary-color);
  margin-right: 0.4rem;
  font-size: 1.6rem;
}

.logo .brand-text-main {
  color: var(--primary-color);
}

.logo .brand-text-sub {
  color: var(--dark-color);
  font-weight: 400;
  font-size: 0.9rem;
  border-left: 1px solid #E2E8F0;
  margin-left: 0.5rem;
  padding-left: 0.5rem;
}

/* 手机端汉堡包菜单交互核心 */
.nav-menu {
  position: fixed;
  top: 4.5rem;
  left: -100%;
  width: 100%;
  height: calc(100vh - 4.5rem);
  background-color: var(--white);
  display: flex;
  flex-direction: column;
  padding: 2rem 1.25rem;
  gap: 1.5rem;
  transition: var(--transition-normal);
  overflow-y: auto;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.05);
}

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

.nav-link {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--dark-color);
  padding: 0.5rem 0;
  border-bottom: 1px solid #F1F5F9;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary-color);
  padding-left: 0.5rem;
}

.nav-cta-btn {
  margin-top: 1rem;
  width: 100%;
}

/* 汉堡包按钮组件 */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: transparent;
  cursor: pointer;
  z-index: 1001;
}

.hamburger span {
  width: 100%;
  height: 3px;
  background-color: var(--primary-color);
  border-radius: 3px;
  transition: var(--transition-normal);
  transform-origin: left center;
}

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

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

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

/* ==========================================================================
   4. 英雄展示区 (Hero Section)
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 6rem;
  background: linear-gradient(135deg, rgba(248, 250, 252, 0.95), rgba(224, 242, 254, 0.9)), 
              url('/images/hero-bg.jpg') no-repeat center center / cover;
  overflow: hidden;
}

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

.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--white);
  border: 1px solid rgba(67, 100, 247, 0.15);
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--dark-color);
  margin-bottom: 1.25rem;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2.25rem;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ==========================================================================
   5. 痛点分析区 (Pain Points Section)
   ========================================================================== */
.pain-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.pain-card {
  background-color: var(--white);
  border-radius: var(--radius-md);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-sm);
  border-top: 4px solid #E2E8F0;
  transition: var(--transition-normal);
}

.pain-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

/* 痛点卡片突出警示视觉 */
.pain-card.active {
  border-top-color: #EF4444; /* 红色：直击核心痛点 */
}

.pain-icon {
  width: 50px;
  height: 50px;
  border-radius: 50px;
  background-color: rgba(239, 68, 68, 0.08);
  color: #EF4444;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.pain-card h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--dark-color);
}

.pain-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ==========================================================================
   6. 解决方案与产品展示区 (Solutions & Products Section)
   ========================================================================== */
.solution-tabs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.solution-tab-item {
  background: var(--white);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  border: 2px solid transparent;
  transition: var(--transition-normal);
}

.solution-tab-item.active {
  border-color: var(--primary-color);
  background: linear-gradient(to right, rgba(0, 82, 212, 0.02), rgba(67, 100, 247, 0.02));
}

.sol-icon {
  width: 40px;
  height: 40px;
  background-color: rgba(0, 82, 212, 0.08);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-weight: bold;
  flex-shrink: 0;
}

.sol-tab-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.sol-tab-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* 产品卡片网格 */
.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.product-card {
  background-color: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
  border: 1px solid #F1F5F9;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.product-image-wrapper {
  position: relative;
  overflow: hidden;
  background-color: #F8FAFC;
  aspect-ratio: 4 / 3;
}

.product-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-normal);
}

.product-card:hover .product-image-wrapper img {
  transform: scale(1.08);
}

.product-tag {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background-color: var(--primary-color);
  color: var(--white);
  padding: 0.35rem 0.85rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
}

.product-info {
  padding: 2rem;
}

.product-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--dark-color);
}

.product-desc {
  font-size: 0.925rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.product-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.25rem;
  border-top: 1px dashed #E2E8F0;
}

.product-price {
  font-size: 1.5rem;
  font-weight: 800;
  color: #EF4444;
}

.product-price span {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* ==========================================================================
   7. 信任背书区 (Social Proof / E-E-A-T)
   ========================================================================== */
.trust-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
  text-align: center;
}

.stat-card {
  background-color: var(--white);
  padding: 2rem 1rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.stat-num {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* 客户 Logo 墙 */
.logo-carousel-title {
  text-align: center;
  font-size: 1rem;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-bottom: 2rem;
  font-weight: 700;
}

.logo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  align-items: center;
  justify-items: center;
  opacity: 0.8;
}

.trust-logo-item {
  width: 130px;
  filter: grayscale(100%);
  opacity: 0.6;
  transition: var(--transition-fast);
}

.trust-logo-item:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* 权威质检报告区 */
.auth-grid {
  margin-top: 4rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.auth-card {
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}

.auth-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.auth-body {
  padding: 1.5rem;
}

.auth-body h4 {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.auth-body p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ==========================================================================
   8. 关于我们与本土 Local SEO 信号 (About Us)
   ========================================================================== */
.about-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

.about-img-group {
  position: relative;
}

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

.about-badge {
  position: absolute;
  bottom: -1.5rem;
  right: 1rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-width: 220px;
}

.about-badge-title {
  font-size: 1.5rem;
  font-weight: 800;
}

.about-badge-desc {
  font-size: 0.8rem;
  opacity: 0.9;
}

.about-content h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  line-height: 1.3;
}

.about-content p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.local-seo-signals {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid #E2E8F0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.signal-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--dark-color);
}

.signal-item svg {
  color: var(--primary-color);
  flex-shrink: 0;
}

/* ==========================================================================
   9. 常见问题 (FAQ foldover with transition)
   ========================================================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--white);
  border: 1px solid #E2E8F0;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  overflow: hidden;
  transition: var(--transition-normal);
}

.faq-item:hover {
  border-color: var(--secondary-color);
}

.faq-header {
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.faq-question {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--dark-color);
  padding-right: 1rem;
}

.faq-toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  transition: var(--transition-normal);
  flex-shrink: 0;
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: var(--transition-normal);
  padding: 0 1.5rem;
}

.faq-content p {
  padding-bottom: 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* FAQ展开时的交互状态 */
.faq-item.active {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-item.active .faq-content {
  max-height: 200px; /* 足够容纳文本的高度 */
}

/* ==========================================================================
   10. 终极呼吁 & 在线表单 (CTA & Lead Form)
   ========================================================================== */
.cta-form-section {
  background: linear-gradient(135deg, #0052D4, #4364F7);
  color: var(--white);
}

.cta-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
  align-items: center;
}

.cta-left h2 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.cta-left p {
  opacity: 0.9;
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.benefits-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.benefit-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
}

.benefit-item svg {
  color: var(--accent-color);
  flex-shrink: 0;
}

/* 留资表单卡片 */
.lead-form-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-lg);
  color: var(--dark-color);
}

.form-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  text-align: center;
}

.form-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--dark-color);
}

.form-control {
  width: 100%;
  padding: 0.85rem 1.25rem;
  border: 1px solid #E2E8F0;
  background-color: #F8FAFC;
  border-radius: var(--radius-sm);
  color: var(--dark-color);
  transition: var(--transition-fast);
}

.form-control:focus {
  border-color: var(--primary-color);
  background-color: var(--white);
  box-shadow: 0 0 0 3px rgba(0, 82, 212, 0.15);
}

.submit-btn {
  width: 100%;
  margin-top: 1rem;
}

/* ==========================================================================
   11. 底部信息栏 (Footer Section)
   ========================================================================== */
.footer {
  background-color: #0F172A; /* 尊贵极深色背景 */
  color: #94A3B8;
  padding: 4.5rem 0 2rem;
  font-size: 0.9rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid #1E293B;
}

.footer-logo {
  font-weight: 900;
  font-size: 1.5rem;
  color: var(--white);
  margin-bottom: 1.25rem;
}

.footer-logo span {
  color: var(--secondary-color);
}

.footer-desc {
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.footer-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1.25rem;
  position: relative;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

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

.footer-contact-info li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer-contact-info svg {
  color: var(--secondary-color);
  margin-top: 0.2rem;
  flex-shrink: 0;
}

/* 页脚底层声明 */
.footer-bottom {
  padding-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-align: center;
}

.footer-beian-link {
  color: #94A3B8;
  transition: var(--transition-fast);
}

.footer-beian-link:hover {
  color: var(--white);
}

.footer-disclaimer {
  font-size: 0.75rem;
  color: #475569;
}

/* ==========================================================================
   12. 响应式布局媒体查询 (Responsive Media Queries)
   ========================================================================== */

/* 平板、折叠设备及以上 (Tablet / Medium devices, 768px and up) */
@media (min-width: 768px) {
  .container {
    max-width: 720px;
  }
  
  .section {
    padding: 6rem 0;
  }
  
  .section-title {
    font-size: 2.5rem;
  }
  
  /* 英雄区布局变化 */
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-buttons {
    flex-direction: row;
  }
  
  /* 痛点卡片排版 */
  .pain-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* 产品展示网格 */
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* 信任背书与资质 */
  .trust-stats {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .logo-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .auth-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* 留资与呼吁区 */
  .cta-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
  
  .lead-form-card {
    padding: 3rem;
  }
  
  /* 关于我们 */
  .local-seo-signals {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* 页脚 */
  .footer-top {
    grid-template-columns: 2fr 1fr 1fr;
  }
  
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* 桌面大屏及以上 (Desktop / Large devices, 1024px and up) */
@media (min-width: 1024px) {
  .container {
    max-width: 960px;
  }
  
  /* PC端导航栏：汉堡包隐藏，平铺显示 */
  .hamburger {
    display: none;
  }
  
  .nav-menu {
    position: static;
    flex-direction: row;
    width: auto;
    height: auto;
    padding: 0;
    gap: 2rem;
    box-shadow: none;
    background: transparent;
    overflow-y: visible;
  }
  
  .nav-link {
    font-size: 1rem;
    padding: 0;
    border-bottom: none;
  }
  
  .nav-link:hover, .nav-link.active {
    color: var(--primary-color);
    padding-left: 0;
    transform: translateY(-1px);
  }
  
  .nav-cta-btn {
    display: none; /* 使用顶部的通用触发器或直接保持简洁 */
  }
  
  /* 解决方案的横向排版 */
  .solution-tabs {
    grid-template-columns: repeat(3, 1fr);
  }
  
  /* 痛点区三列排版 */
  .pain-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  /* 关于我们两列排版 */
  .about-wrapper {
    grid-template-columns: 1fr 1.1fr;
  }
  
  /* 页脚 */
  .footer-top {
    grid-template-columns: 2fr 1fr 1.2fr;
  }
}

/* 超大桌面屏幕 (Extra Large devices, 1200px and up) */
@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }
  
  .hero-title {
    font-size: 3.5rem;
  }
}