/* ========================================
   大国平台 - 高端品牌网站样式
   ======================================== */

/* CSS Variables */
:root {
  /* 颜色系统 */
  --color-primary: #C41E3A;
  --color-primary-dark: #A01830;
  --color-primary-light: #E8364F;
  --color-primary-bg: rgba(196, 30, 58, 0.05);
  
  --color-dark: #1A1A1A;
  --color-dark-secondary: #2D2D2D;
  --color-gray: #666666;
  --color-gray-light: #999999;
  --color-gray-lighter: #E5E5E5;
  --color-gray-lightest: #F5F5F5;
  --color-white: #FFFFFF;
  --color-off-white: #FAFAFA;
  
  /* 字体 */
  --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  
  /* 间距 */
  --section-padding: 100px 0;
  --container-width: 1200px;
  --container-padding: 0 20px;
  
  /* 阴影 */
  --shadow-sm: 0 2px 8px 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);
  --shadow-xl: 0 16px 60px rgba(0, 0, 0, 0.15);
  
  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  
  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-dark);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul {
  list-style: none;
}

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

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

/* ========================================
   Header 导航
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: var(--transition-base);
}

.header.scrolled {
  border-bottom-color: var(--color-gray-lighter);
  box-shadow: var(--shadow-sm);
}

.header-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-white);
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

.logo-text {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
  letter-spacing: 1px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-gray);
  position: relative;
  padding: 8px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link:hover::after {
  width: 100%;
}

.btn-apply {
  padding: 10px 24px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.btn-apply:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(196, 30, 58, 0.3);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  transition: var(--transition-fast);
}

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

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

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

/* 移动端导航 */
.mobile-nav {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--color-white);
  padding: 20px;
  box-shadow: var(--shadow-md);
  transform: translateY(-100%);
  opacity: 0;
  transition: var(--transition-base);
  z-index: 999;
}

.mobile-nav.active {
  transform: translateY(0);
  opacity: 1;
}

.mobile-nav-link {
  display: block;
  padding: 15px 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-dark);
  border-bottom: 1px solid var(--color-gray-lightest);
}

.mobile-nav-link.highlight {
  color: var(--color-primary);
  font-weight: 600;
}

/* ========================================
   Hero 首屏
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 120px 20px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, #fff5f5 0%, #fff 50%, #f8f9fa 100%);
  z-index: -2;
}

.hero-bg::before {
  content: '';
  position: absolute;
  top: 20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(196, 30, 58, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-bg::after {
  content: '';
  position: absolute;
  bottom: 10%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(196, 30, 58, 0.05) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--color-white);
  border: 1px solid var(--color-primary);
  border-radius: 50px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 32px;
  animation: fadeInUp 0.8s ease;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease 0.1s both;
}

.title-main {
  font-size: 72px;
  font-weight: 900;
  letter-spacing: 8px;
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 28px;
  font-weight: 400;
  color: var(--color-dark);
  margin-bottom: 16px;
  letter-spacing: 2px;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-desc {
  font-size: 18px;
  color: var(--color-gray);
  margin-bottom: 48px;
  animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 64px;
  animation: fadeInUp 0.8s ease 0.4s both;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-white);
  box-shadow: 0 4px 20px rgba(196, 30, 58, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(196, 30, 58, 0.4);
}

.btn-primary svg {
  transition: var(--transition-fast);
}

.btn-primary:hover svg {
  transform: translateX(4px);
}

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

.btn-secondary:hover {
  background: var(--color-primary-bg);
}

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

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 16px;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  animation: fadeInUp 0.8s ease 0.5s both;
}

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

.stat-number {
  display: block;
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 8px;
}

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

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-gray-lighter);
}

/* Hero 装饰 */
.hero-decoration {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: -1;
}

.decoration-circle {
  position: absolute;
  border: 1px solid rgba(196, 30, 58, 0.1);
  border-radius: 50%;
}

.circle-1 {
  width: 300px;
  height: 300px;
  top: 10%;
  left: 5%;
  animation: float 8s ease-in-out infinite;
}

.circle-2 {
  width: 200px;
  height: 200px;
  top: 60%;
  right: 10%;
  animation: float 6s ease-in-out infinite 1s;
}

.circle-3 {
  width: 150px;
  height: 150px;
  bottom: 15%;
  left: 15%;
  animation: float 7s ease-in-out infinite 2s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Section 通用样式
   ======================================== */
.section {
  padding: var(--section-padding);
}

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

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--color-primary-bg);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  border-radius: 50px;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.section-tag.light {
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.section-desc {
  font-size: 18px;
  color: var(--color-gray);
}

.section-header.light .section-title {
  color: var(--color-white);
}

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

/* ========================================
   四大核心板块
   ======================================== */
.core-modules {
  background: var(--color-off-white);
}

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

.module-card {
  display: block;
  background: var(--color-white);
  padding: 40px 30px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  transform: scaleX(0);
  transition: var(--transition-base);
}

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

.module-card:hover::before {
  transform: scaleX(1);
}

.module-icon {
  width: 72px;
  height: 72px;
  background: var(--color-primary-bg);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 24px;
  transition: var(--transition-base);
}

.module-card:hover .module-icon {
  background: var(--color-primary);
  color: var(--color-white);
}

.module-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.module-desc {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 20px;
}

.module-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-gray-lightest);
  border-radius: 50%;
  color: var(--color-gray);
  transition: var(--transition-fast);
}

.module-card:hover .module-arrow {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ========================================
   为什么选择大国
   ======================================== */
.advantages-section {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.advantages-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(196, 30, 58, 0.15) 0%, transparent 60%);
  border-radius: 50%;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  position: relative;
  z-index: 1;
}

.advantage-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition-base);
}

.advantage-card:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-6px);
  border-color: rgba(196, 30, 58, 0.5);
}

.advantage-number {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 48px;
  font-weight: 900;
  color: rgba(196, 30, 58, 0.2);
  line-height: 1;
}

.advantage-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
}

.advantage-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

.advantage-desc {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
}

/* ========================================
   推荐品牌展示
   ======================================== */
.brands-section {
  background: var(--color-white);
}

.brands-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}

.brand-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-lighter);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  text-align: center;
  transition: var(--transition-base);
  cursor: pointer;
}

.brand-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.brand-logo {
  width: 80px;
  height: 80px;
  margin: 0 auto 16px;
  background: var(--color-gray-lightest);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-placeholder {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-gray-light);
}

.brand-info {
  opacity: 0;
  transform: translateY(10px);
  transition: var(--transition-fast);
}

.brand-card:hover .brand-info {
  opacity: 1;
  transform: translateY(0);
}

.brand-info h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 4px;
}

.brand-info p {
  font-size: 12px;
  color: var(--color-gray);
}

/* ========================================
   榜单展示
   ======================================== */
.ranks-section {
  background: var(--color-gray-lightest);
}

.ranks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.rank-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

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

.rank-badge {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  padding: 20px 24px;
}

.rank-year {
  font-size: 32px;
  font-weight: 900;
  color: var(--color-white);
  letter-spacing: 2px;
}

.rank-content {
  padding: 28px;
}

.rank-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.rank-desc {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 20px;
}

.rank-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

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

/* ========================================
   入选流程
   ======================================== */
.process-section {
  background: var(--color-white);
}

.process-steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 20px;
}

.process-step {
  text-align: center;
  flex: 1;
  max-width: 220px;
  position: relative;
}

.step-number {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 28px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 13px;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.step-icon {
  width: 100px;
  height: 100px;
  margin: 20px auto 24px;
  background: var(--color-primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  transition: var(--transition-base);
}

.process-step:hover .step-icon {
  background: var(--color-primary);
  color: var(--color-white);
  transform: scale(1.1);
}

.step-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 14px;
  color: var(--color-gray);
}

.process-connector {
  display: flex;
  align-items: center;
  padding-top: 50px;
  color: var(--color-gray-lighter);
}

/* ========================================
   入选申请
   ======================================== */
.apply-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  position: relative;
  overflow: hidden;
}

.apply-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 60%);
  border-radius: 50%;
}

.apply-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
  position: relative;
  z-index: 1;
}

.apply-info {
  flex: 1;
}

.apply-info .section-tag {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
}

.apply-title {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 20px;
  letter-spacing: 2px;
}

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

.apply-benefits {
  margin-bottom: 40px;
}

.apply-benefits li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  color: var(--color-white);
  font-size: 16px;
}

.apply-benefits svg {
  flex-shrink: 0;
  color: #4ADE80;
}

.apply-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.apply-actions .btn-primary {
  background: var(--color-white);
  color: var(--color-primary);
}

.apply-actions .btn-primary:hover {
  background: var(--color-gray-lightest);
}

.apply-actions .btn-outline {
  border-color: var(--color-white);
  color: var(--color-white);
}

.apply-actions .btn-outline:hover {
  background: var(--color-white);
  color: var(--color-primary);
}

.apply-visual {
  flex-shrink: 0;
}

.visual-card {
  width: 280px;
  height: 280px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.visual-icon {
  color: var(--color-white);
  opacity: 0.8;
}

.visual-text {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-white);
}

/* ========================================
   联系方式
   ======================================== */
.contact-section {
  background: var(--color-off-white);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.contact-card {
  background: var(--color-white);
  padding: 40px 30px;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

.contact-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.contact-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  background: var(--color-primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.contact-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.contact-info {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

.qrcode-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px;
  background: var(--color-gray-lightest);
  border-radius: var(--radius-md);
  color: var(--color-gray);
}

.qrcode-placeholder span {
  font-size: 14px;
}

/* ========================================
   Footer 底部
   ======================================== */
.footer {
  background: var(--color-dark);
  padding: 80px 0 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.footer-logo .logo-icon {
  background: var(--color-primary);
}

.footer-logo .logo-text {
  color: var(--color-white);
}

.footer-tagline {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

.footer-links {
  display: flex;
  gap: 80px;
}

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

.footer-column a {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  padding: 8px 0;
  transition: var(--transition-fast);
}

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

.footer-bottom {
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

.friendly-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.links-title {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

.friendly-links a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
}

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

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
  .modules-grid,
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .brands-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .hero-stats {
    gap: 32px;
  }
  
  .stat-number {
    font-size: 28px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 60px 0;
  }
  
  .nav,
  .btn-apply {
    display: none;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .mobile-nav {
    display: block;
  }
  
  .title-main {
    font-size: 48px;
    letter-spacing: 4px;
  }
  
  .hero-subtitle {
    font-size: 22px;
  }
  
  .hero-desc {
    font-size: 16px;
  }
  
  .hero-actions {
    flex-direction: column;
    gap: 16px;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 24px;
  }
  
  .stat-divider {
    display: none;
  }
  
  .modules-grid,
  .advantages-grid,
  .ranks-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .brands-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .process-steps {
    flex-direction: column;
    align-items: center;
    gap: 40px;
  }
  
  .process-connector {
    transform: rotate(90deg);
    padding: 0;
  }
  
  .apply-content {
    flex-direction: column;
    text-align: center;
  }
  
  .apply-actions {
    flex-direction: column;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .apply-title {
    font-size: 28px;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 40px;
  }
  
  .footer-links {
    flex-wrap: wrap;
    gap: 40px;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  
  .visual-card {
    width: 220px;
    height: 220px;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 100px 16px 60px;
  }
  
  .title-main {
    font-size: 36px;
    letter-spacing: 2px;
  }
  
  .hero-subtitle {
    font-size: 18px;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .brands-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  
  .section-title {
    font-size: 24px;
  }
}