/**
 * 嘀嘀呱呱官网 - 平衡型设计系统（方案B）
 * Balanced Design System - Visual Appeal + SEO Friendly
 */

/* ==================== CSS Variables ==================== */
:root {
  /* 主色 - 中远海运蓝 */
  --color-primary: #004B87;
  --color-primary-dark: #003d6e;
  --color-primary-light: #005BAC;
  
  /* 辅助色 - 中国红 */
  --color-accent: #E60012;
  --color-accent-dark: #cc0000;
  --color-accent-light: #ff1a2e;
  
  /* 中性色 */
  --color-black: #000000;
  --color-gray-900: #1a1a1a;
  --color-gray-700: #333333;
  --color-gray-500: #666666;
  --color-gray-300: #999999;
  --color-gray-200: #cccccc;
  --color-gray-100: #f5f5f5;
  
  /* 背景色 */
  --bg-white: #ffffff;
  --bg-light: #fafafa;
  --bg-gray: #f0f0f0;
  
  /* 文字色 */
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --text-white: #ffffff;
  
  /* Logo样式 */
  --logo-text-color: var(--color-primary);
  
  /* 阴影 - 轻微但明显 */
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 8px 32px rgba(0, 0, 0, 0.15);
  
  /* 圆角 - 适中 */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  
  /* 间距 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 5rem;
  
  /* 过渡动画 */
  --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: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-white);
  overflow-x: hidden;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: all var(--transition-base);
}

a:hover {
  color: var(--color-accent);
}

/* ==================== Typography ==================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

h1 { 
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.02em;
}

h2 { 
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
}

h3 { 
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

h4 { 
  font-size: 1.125rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  line-height: 1.8;
}

strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* ==================== Layout ==================== */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
}

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

/* ==================== Navigation ==================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  margin-top: -40px;
}

.logo img {
  height: 150px;
  width: auto;
  transition: all var(--transition-base);
}

@media (max-width: 768px) {
  .navbar .container {
    height: 60px;
  }
  
  .logo {
    margin-top: -32px;
  }
  
  .logo img {
    height: 125px;
  }
}

/* Footer Logo Responsive */
.footer .logo img {
  height: 100px;
  width: auto;
}

@media (max-width: 768px) {
  .footer .logo img {
    height: 70px;
  }
  
  .footer .logo {
    padding: 12px 16px !important;
  }
}

.logo {
  display: flex;
  align-items: center;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo-text {
  /* 钛金属渐变色 */
  background: linear-gradient(135deg, 
    #4a5568 0%, 
    #718096 15%, 
    #a0aec0 30%, 
    #cbd5e0 45%, 
    #e2e8f0 50%, 
    #cbd5e0 55%, 
    #a0aec0 70%, 
    #718096 85%, 
    #4a5568 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  animation: titanium-shimmer 4s ease-in-out infinite;
}

@keyframes titanium-shimmer {
  0%, 100% { 
    background-position: 0% 50%; 
  }
  50% { 
    background-position: 100% 50%; 
  }
}

.nav-menu {
  display: none;
  gap: var(--space-lg);
  align-items: center;
}

@media (min-width: 1024px) {
  .nav-menu {
    display: flex;
  }
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  padding: 0.5rem 0;
  position: relative;
  transition: color var(--transition-base);
}

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

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

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

/* Dropdown Menu */
.dropdown {
  position: relative;
}

.dropdown-toggle {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  padding: 0.5rem 0;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 280px;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-gray-200);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  margin-top: 8px;
}

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

.dropdown-item {
  display: block;
  padding: 12px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--bg-light);
}

.dropdown-item-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  font-size: 0.9375rem;
}

.dropdown-item-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: flex;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
}

@media (min-width: 1024px) {
  .mobile-menu-toggle {
    display: none;
  }
}

.mobile-menu {
  display: none;
  border-top: 1px solid var(--color-gray-200);
  background: var(--bg-white);
}

.mobile-menu.active {
  display: block;
}

.mobile-menu-content {
  padding: 16px;
}

.mobile-menu-item {
  display: block;
  padding: 12px;
  color: var(--text-primary);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.mobile-menu-item:hover {
  background: var(--bg-light);
}

.mobile-menu-section {
  padding: 12px;
}

.mobile-menu-label {
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.mobile-menu-subitem {
  display: block;
  padding: 8px 12px;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.mobile-menu-subitem:hover {
  color: var(--color-primary);
}

/* ==================== Hero Section ==================== */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, 
    var(--color-primary) 0%, 
    var(--color-primary-light) 100%);
  overflow: hidden;
}

/* 支持自定义背景图片 */
.hero[style*="background-image"] {
  background-size: cover !important;
  background-position: center !important;
  background-repeat: no-repeat !important;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%23ffffff' fill-opacity='0.05' fill-rule='evenodd'/%3E%3C/svg%3E");
  opacity: 0.3;
}

/* 当有背景图片时，移除遮罩层 */
.hero[style*="background-image"]::before {
  opacity: 0;
}

/* Hero区域文字增强可读性 - 使用强阴影 */
.hero[style*="background-image"] .hero-content {
  text-shadow: 3px 3px 12px rgba(0,0,0,0.9), 0 0 30px rgba(0,0,0,0.7);
}

.hero[style*="background-image"] .hero-logo,
.hero[style*="background-image"] .hero-tagline,
.hero[style*="background-image"] .hero-description {
  color: #ffffff !important;
  font-weight: 800;
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  color: white;
  max-width: 900px;
  padding: var(--space-2xl);
}

.hero-logo {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
  color: white;
}

.hero-tagline {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  font-weight: 400;
  margin-bottom: var(--space-md);
  opacity: 0.95;
  line-height: 1.6;
}

.hero-description {
  font-size: 1rem;
  margin-bottom: var(--space-xl);
  opacity: 0.9;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ==================== Buttons ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  justify-content: center;
}

.btn-primary {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  border-color: white;
  color: white;
}

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

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

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

.btn-large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* ==================== Section Header ==================== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ==================== Business Grid ==================== */
.business-section {
  background: var(--bg-light);
}

.business-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: repeat(1, 1fr);
}

@media (min-width: 768px) {
  .business-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .business-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .business-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.business-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.business-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

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

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

.card-icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  color: white;
  transition: all var(--transition-base);
}

.business-card:hover .card-icon {
  background: var(--color-accent);
}

.card-title {
  font-size: 1.125rem;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
  font-weight: 600;
}

.card-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.card-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.card-link:hover {
  color: var(--color-accent);
}

/* ==================== Stats Section ==================== */
.stats-section {
  background: var(--color-primary);
  color: white;
  padding: var(--space-2xl) 0;
}

.stats-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

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

.stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: white;
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.9;
}

/* ==================== CTA Section ==================== */
.cta-section {
  background: var(--bg-light);
  text-align: center;
}

.cta-title {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.cta-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-form {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .cta-form {
    grid-template-columns: repeat(3, 1fr) auto;
  }
}

.input {
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  background: var(--bg-white);
  transition: all var(--transition-base);
}

.input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 75, 135, 0.1);
}

/* ==================== Footer ==================== */
.footer {
  background: var(--color-gray-900);
  color: white;
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-xl);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer-logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  /* 钛金属渐变色 - 浅色版本（适合深色背景）*/
  background: linear-gradient(135deg, 
    #cbd5e0 0%, 
    #e2e8f0 15%, 
    #f7fafc 30%, 
    #ffffff 45%, 
    #f7fafc 50%, 
    #ffffff 55%, 
    #f7fafc 70%, 
    #e2e8f0 85%, 
    #cbd5e0 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: titanium-shimmer 4s ease-in-out infinite;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: white;
}

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

.footer-links li {
  margin-bottom: var(--space-xs);
}

.footer-links a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-gray-700);
  padding-top: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-copyright {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ==================== Animations ==================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeInUp 0.6s ease-out;
}

/* ==================== Utilities ==================== */
.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mt-5 { margin-top: var(--space-xl); }

.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }
.mb-5 { margin-bottom: var(--space-xl); }

.pt-1 { padding-top: var(--space-xs); }
.pt-2 { padding-top: var(--space-sm); }
.pt-3 { padding-top: var(--space-md); }
.pt-4 { padding-top: var(--space-lg); }
.pt-5 { padding-top: var(--space-xl); }

.pb-1 { padding-bottom: var(--space-xs); }
.pb-2 { padding-bottom: var(--space-sm); }
.pb-3 { padding-bottom: var(--space-md); }
.pb-4 { padding-bottom: var(--space-lg); }
.pb-5 { padding-bottom: var(--space-xl); }

/* ==================== 案例展示 ==================== */

/* 筛选按钮 */
.cases-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: var(--space-2xl);
}

.cases-filter-btn {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--color-gray-200);
  border-radius: 999px;
  background: var(--bg-white);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
}

.cases-filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(0, 75, 135, 0.05);
}

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

.cases-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .cases-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.case-card {
  background: var(--bg-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  border: 1px solid var(--color-gray-200);
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(30px);
  animation: caseFadeIn 0.6s ease-out forwards;
}

.case-card:nth-child(1) { animation-delay: 0.05s; }
.case-card:nth-child(2) { animation-delay: 0.1s; }
.case-card:nth-child(3) { animation-delay: 0.15s; }
.case-card:nth-child(4) { animation-delay: 0.2s; }
.case-card:nth-child(5) { animation-delay: 0.25s; }
.case-card:nth-child(6) { animation-delay: 0.3s; }

@keyframes caseFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.case-image {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: var(--bg-gray);
}

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

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

.case-image .case-category-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: white;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  padding: 0.375rem 0.75rem;
  border-radius: 999px;
  z-index: 2;
}

.case-image .case-category-badge i {
  width: 12px;
  height: 12px;
}

.case-content {
  padding: var(--space-md);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.case-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(0, 75, 135, 0.08);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.case-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  line-height: 1.4;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.case-description {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 案例关键成果标签 */
.case-results {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--space-sm);
  padding-top: var(--space-xs);
  border-top: 1px solid var(--color-gray-100);
}

.case-result-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(230, 0, 18, 0.06);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-sm);
}

.case-result-tag i {
  width: 12px;
  height: 12px;
}

.case-meta {
  display: flex;
  gap: var(--space-md);
  font-size: 0.75rem;
  color: var(--color-gray-300);
}

.case-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.case-meta i {
  width: 13px;
  height: 13px;
}

.case-card-footer {
  margin-top: auto;
  padding-top: var(--space-sm);
}

.case-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: all var(--transition-fast);
}

.case-card-link:hover {
  color: var(--color-accent);
  gap: 0.5rem;
}

.case-card-link i {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.case-card-link:hover i {
  transform: translateX(3px);
}

/* ==================== 案例页 CTA 增强 ==================== */
.cases-cta-section {
  background: linear-gradient(135deg, 
    var(--color-primary) 0%, 
    var(--color-primary-light) 100%);
  position: relative;
  overflow: hidden;
}

.cases-cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.cases-cta-section .container {
  position: relative;
  z-index: 1;
}

.cases-cta-title {
  color: white;
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  text-align: center;
}

.cases-cta-subtitle {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1rem;
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  line-height: 1.7;
}

.cases-cta-form {
  max-width: 800px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}

.cases-form-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .cases-form-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .cases-form-grid .form-group-full {
    grid-column: 1 / -1;
  }
}

.cases-form-group {
  text-align: left;
}

.cases-form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 0.375rem;
}

.cases-form-group .input {
  width: 100%;
  background: rgba(255, 255, 255, 0.9);
  border-color: transparent;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.cases-form-group .input:focus {
  background: white;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(230, 0, 18, 0.15);
}

.cases-form-group .input::placeholder {
  color: var(--color-gray-300);
}

.cases-phone-row {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.cases-phone-row .input {
  flex: 1;
}

.cases-verify-btn {
  padding: 0.75rem 1.25rem;
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.15);
  color: white;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-base);
}

.cases-verify-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.5);
}

.cases-verify-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.cases-code-hint {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 0.375rem;
  display: block;
}

.cases-submit-btn {
  width: 100%;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  margin-top: var(--space-xs);
}

.cases-submit-btn:hover:not(:disabled) {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(230, 0, 18, 0.35);
}

.cases-submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.cases-trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.cases-trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
}

.cases-trust-badge i {
  width: 14px;
  height: 14px;
  color: rgba(255, 255, 255, 0.5);
}

/* ==================== 联系我们 ==================== */
.contact-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .contact-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.contact-card {
  background: var(--bg-white);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  border: 1px solid var(--color-gray-200);
  text-align: center;
  transition: all var(--transition-base);
}

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

.contact-icon {
  width: 60px;
  height: 60px;
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
  color: white;
  transition: all var(--transition-base);
}

.contact-card:hover .contact-icon {
  background: var(--color-accent);
}

.contact-icon i {
  width: 28px;
  height: 28px;
}

.contact-card-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.contact-card-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
  line-height: 1.6;
}

.contact-card-hint {
  font-size: 0.8125rem;
  color: var(--color-gray-300);
}

/* 联系表单 */
.contact-form-container {
  max-width: 720px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}

.contact-form-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .contact-form-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .contact-form-group-full {
    grid-column: 1 / -1;
  }
}

.contact-form-group {
  text-align: left;
}

.contact-form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 0.375rem;
}

.contact-form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-primary);
  transition: all var(--transition-base);
  font-family: inherit;
}

.contact-form-input:focus {
  outline: none;
  background: white;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(230, 0, 18, 0.15);
}

.contact-form-input::placeholder {
  color: var(--color-gray-300);
}

.contact-form-textarea {
  resize: vertical;
  min-height: 100px;
}

.contact-phone-row {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.contact-phone-row .contact-form-input {
  flex: 1;
}

.contact-verify-btn {
  padding: 0.75rem 1.25rem;
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.15);
  color: white;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-base);
  font-family: inherit;
}

.contact-verify-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.5);
}

.contact-verify-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.contact-code-hint {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 0.375rem;
  display: block;
}

.contact-submit-btn {
  width: 100%;
  max-width: 320px;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  font-family: inherit;
}

.contact-submit-btn:hover:not(:disabled) {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(230, 0, 18, 0.35);
}

.contact-submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.contact-trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.contact-trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.7);
}

.contact-trust-badge i {
  width: 14px;
  height: 14px;
  color: rgba(255, 255, 255, 0.5);
}

/* ==================== 关于我们 ==================== */

/* 公司简介 */
.about-intro {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
  align-items: center;
}

@media (min-width: 768px) {
  .about-intro {
    grid-template-columns: 1fr 1fr;
  }
}

.about-intro-image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-intro-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about-intro-content {
  padding: var(--space-md) 0;
}

/* 段落标题 */
.about-section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

/* 办公环境图片网格 */
.about-office-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-xl);
}

@media (min-width: 640px) {
  .about-office-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
  
  .about-office-image-main {
    grid-row: span 2;
  }
}

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

.about-office-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-base);
}

.about-office-image:hover img {
  transform: scale(1.04);
}

.about-image-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.625rem 1rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
  color: white;
  font-size: 0.75rem;
  font-weight: 500;
}

/* 办公地点描述卡片 */
.about-office-desc {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .about-office-desc {
    grid-template-columns: repeat(3, 1fr);
  }
}

.about-office-desc-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-gray-200);
  text-align: center;
  transition: all var(--transition-base);
}

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

.about-office-desc-card i {
  width: 36px;
  height: 36px;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.about-office-desc-card h4 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.about-office-desc-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* 核心优势 */
.about-advantages-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .about-advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.about-advantage-card {
  display: flex;
  gap: var(--space-md);
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
  align-items: flex-start;
}

.about-advantage-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.about-advantage-icon {
  width: 52px;
  height: 52px;
  min-width: 52px;
  background: rgba(0, 75, 135, 0.08);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.about-advantage-icon i {
  width: 26px;
  height: 26px;
}

.about-advantage-card h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.about-advantage-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* 团队风采 */
.about-team-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .about-team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.about-team-card {
  background: var(--bg-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

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

.about-team-photo {
  width: 100%;
  height: 280px;
  overflow: hidden;
}

.about-team-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.about-team-card:hover .about-team-photo img {
  transform: scale(1.05);
}

.about-team-info {
  padding: var(--space-md);
  text-align: center;
}

.about-team-info h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.about-team-info p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}