/* 御奇YugeeVisionAI数字员工官网 - 全局样式 */

/* ===== 基础重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 品牌色 */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #0ea5e9;
  --accent: #f59e0b;
  
  /* 中性色 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  
  /* 功能色 */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* 圆角 */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

ul, ol {
  list-style: none;
}

/* ===== 容器 ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== 导航栏 ===== */
.navbar {
  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 var(--border-color);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.navbar-logo .logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  font-size: 1.125rem;
}

.navbar-logo:hover {
  color: var(--text-primary);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.navbar-menu a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
}

.navbar-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-fast);
}

.navbar-menu a:hover,
.navbar-menu a.active {
  color: var(--primary);
}

.navbar-menu a:hover::after,
.navbar-menu a.active::after {
  width: 100%;
}

.navbar-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-fast);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(99, 102, 241, 0.5);
  color: white;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

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

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

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

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

/* ===== Hero区域 ===== */
.hero {
  padding: 10rem 0 6rem;
  background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 50%, #f0f9ff 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(14, 165, 233, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: white;
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary);
  box-shadow: var(--shadow-md);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 50%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ===== 区块 ===== */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-badge {
  display: inline-block;
  padding: 0.375rem 1rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(14, 165, 233, 0.1));
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== 特色卡片网格 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: white;
  border-radius: var(--radius-xl);
  padding: 2rem;
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.feature-icon.icon-1 { background: linear-gradient(135deg, #6366f1, #818cf8); }
.feature-icon.icon-2 { background: linear-gradient(135deg, #0ea5e9, #38bdf8); }
.feature-icon.icon-3 { background: linear-gradient(135deg, #10b981, #34d399); }
.feature-icon.icon-4 { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
.feature-icon.icon-5 { background: linear-gradient(135deg, #ef4444, #f87171); }
.feature-icon.icon-6 { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
.feature-icon.icon-7 { background: linear-gradient(135deg, #ec4899, #f472b6); }
.feature-icon.icon-8 { background: linear-gradient(135deg, #14b8a6, #2dd4bf); }

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.feature-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 产品功能卡片 ===== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.product-card {
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

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

.product-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
}

.product-content {
  padding: 1.5rem;
}

.product-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.product-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.product-tag {
  padding: 0.25rem 0.75rem;
  background: var(--bg-tertiary);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ===== 解决方案卡片 ===== */
.solutions-grid {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.solution-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  background: white;
  border-radius: var(--radius-2xl);
  padding: 3rem;
  border: 1px solid var(--border-color);
}

.solution-card:nth-child(even) {
  direction: rtl;
}

.solution-card:nth-child(even) > * {
  direction: ltr;
}

.solution-image {
  border-radius: var(--radius-xl);
  height: 300px;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
}

.solution-content {
  padding: 1rem;
}

.solution-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.solution-pain,
.solution-solve,
.solution-effect {
  margin-bottom: 1.25rem;
}

.solution-pain strong,
.solution-solve strong,
.solution-effect strong {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.solution-pain p,
.solution-solve p,
.solution-effect p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 案例卡片 ===== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.case-card {
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

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

.case-header {
  padding: 2rem 2rem 1.5rem;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  border-bottom: 1px solid var(--border-color);
}

.case-industry {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: white;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1rem;
}

.case-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.case-body {
  padding: 1.5rem 2rem 2rem;
}

.case-section {
  margin-bottom: 1.25rem;
}

.case-section:last-child {
  margin-bottom: 0;
}

.case-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.case-section-content {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.case-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

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

.case-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.case-stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===== 关于我们 ===== */
.about-hero {
  padding: 10rem 0 5rem;
  background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 50%, #f0f9ff 100%);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-image {
  border-radius: var(--radius-2xl);
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
}

.about-text h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.about-text p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.about-values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.about-value {
  text-align: center;
  padding: 2rem;
  background: white;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
}

.about-value-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
}

.about-value h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.about-value p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ===== 联系我们 ===== */
.contact-hero {
  padding: 10rem 0 5rem;
  background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 50%, #f0f9ff 100%);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.contact-info h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.contact-info > p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
}

.contact-item-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.contact-item-content h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.contact-item-content p {
  font-size: 1rem;
  color: var(--text-primary);
}

.contact-form {
  background: white;
  border-radius: var(--radius-2xl);
  padding: 2.5rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
}

.contact-form h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

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

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  transition: all var(--transition-fast);
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  background: white;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  background: white;
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--bg-secondary);
}

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

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

.faq-item.active .faq-answer {
  padding: 0 1.5rem 1.5rem;
  max-height: 500px;
}

.faq-answer p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== CTA区块 ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  padding: 5rem 0;
  text-align: center;
  color: white;
}

.cta-section h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-section p {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-section .btn-primary {
  background: white;
  color: var(--primary);
  box-shadow: var(--shadow-lg);
}

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

/* ===== 页脚 ===== */
.footer {
  background: var(--text-primary);
  color: white;
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-brand .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.footer-brand p {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.footer-social {
  display: flex;
  gap: 0.75rem;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--primary);
  transform: translateY(-2px);
}

.footer-column h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

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

.footer-column ul li a {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

.footer-column ul li a:hover {
  color: white;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ===== 浮动咨询按钮 ===== */
.floating-cta {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 999;
}

.floating-cta .btn {
  box-shadow: var(--shadow-xl);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .about-image {
    height: 300px;
  }
  
  .solution-card {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .solution-card:nth-child(even) {
    direction: ltr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .navbar-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
  }
  
  .navbar-menu.active {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .navbar-cta .btn {
    display: none;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .features-grid,
  .products-grid,
  .cases-grid {
    grid-template-columns: 1fr;
  }
  
  .about-values {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-social {
    justify-content: center;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .floating-cta {
    bottom: 1rem;
    right: 1rem;
  }
  
  .floating-cta .btn {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 8rem 0 4rem;
  }
  
  .hero-title {
    font-size: 1.875rem;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .hero-buttons .btn {
    width: 100%;
  }
  
  .section {
    padding: 3rem 0;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .cta-section h2 {
    font-size: 1.75rem;
  }
  
  .case-stats {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
}

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

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

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }

.hidden { display: none; }