/* ====================================
   书签白板官网样式
   活泼插画风格 - 温暖亲和配色
   ==================================== */

/* CSS Variables - 科技风格配色系统 */
:root {
  /* 主色调 - 科技蓝 */
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-300: #93c5fd;
  --primary-400: #60a5fa;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --primary-800: #1e40af;
  --primary-900: #1e3a8a;
  
  /* 辅助色 - 赛博青 */
  --secondary-400: #22d3ee;
  --secondary-500: #06b6d4;
  --secondary-600: #0891b2;
  
  /* 强调色 - 霓虹紫 */
  --accent-400: #a78bfa;
  --accent-500: #8b5cf6;
  --accent-600: #7c3aed;
  
  /* 中性色 - 深空灰 */
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  
  /* 科技渐变 */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --gradient-accent: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
  --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  --gradient-cyber: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #06b6d4 100%);
  
  /* 阴影 - 科技感 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.4);
  --shadow-neon: 0 0 20px rgba(139, 92, 246, 0.5), 0 0 40px rgba(6, 182, 212, 0.3);
  
  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* 字体 */
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* 基础样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--gray-300);
  background-color: var(--gray-900);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ====================================
   导航栏
   ==================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-800);
  z-index: 1000;
  transition: var(--transition-base);
}

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

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav-logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
}

.nav-title {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  color: var(--gray-300);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  transition: var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: var(--transition-base);
}

.nav-link:hover {
  color: var(--primary-600);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 语言切换器 - 苹果风格滑块 */
.lang-switcher {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 3px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 24px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
}

.lang-switcher:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

/* 滑块背景 */
.lang-slider-bg {
  position: absolute;
  top: 3px;
  left: 3px;
  width: calc(50% - 3px);
  height: calc(100% - 6px);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 20px;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
  z-index: 1;
}

/* 滑块在 EN 位置 */
.lang-switcher[data-active="en"] .lang-slider-bg {
  transform: translateX(100%);
}

.lang-btn {
  position: relative;
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 6px 16px;
  cursor: pointer;
  border-radius: 20px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  letter-spacing: 0.8px;
  z-index: 2;
  min-width: 44px;
  text-align: center;
}

.lang-btn:hover {
  color: rgba(255, 255, 255, 0.9);
}

.lang-btn.active {
  color: white;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* 添加点击波纹效果 */
.lang-switcher::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
  pointer-events: none;
  z-index: 0;
}

.lang-switcher:active::after {
  width: 200px;
  height: 200px;
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--gray-300);
  transition: var(--transition-base);
}

/* ====================================
   按钮样式
   ==================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: var(--transition-base);
  cursor: pointer;
  border: none;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1.125rem;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

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

.btn-outline {
  background: transparent;
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  border-color: white;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  transform: translateY(-2px);
}

.btn-icon {
  flex-shrink: 0;
}

/* ====================================
   Hero 区域 - 深色科技风
   ==================================== */
.hero {
  padding: 140px 0 100px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--gray-900) 0%, var(--gray-800) 100%);
  color: white;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  z-index: 2;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 24px;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle-main {
  font-size: 2rem;
  font-weight: 700;
  color: white;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--gray-300);
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
}

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

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-cyber);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--gray-400);
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--gray-300);
}

/* Hero 视觉区域 */
.hero-visual {
  position: relative;
  z-index: 2;
}

.hero-mockup {
  perspective: 1000px;
}

.mockup-window {
  background: var(--gray-800);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transform: rotateY(-5deg) rotateX(5deg);
  transition: var(--transition-slow);
  border: 1px solid var(--gray-700);
}

.mockup-window:hover {
  transform: rotateY(0deg) rotateX(0deg);
}

.mockup-header {
  background: var(--gray-900);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--gray-700);
}

.mockup-dots {
  display: flex;
  gap: 8px;
}

.mockup-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gray-300);
}

.mockup-dots span:nth-child(1) {
  background: #ff5f56;
}

.mockup-dots span:nth-child(2) {
  background: #ffbd2e;
}

.mockup-dots span:nth-child(3) {
  background: #27ca40;
}

.mockup-title {
  font-size: 0.875rem;
  color: var(--gray-300);
  font-weight: 500;
}

.mockup-content {
  padding: 32px;
}

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

.mockup-card {
  background: var(--gray-700);
  border: 2px solid var(--gray-600);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: var(--transition-base);
}

.mockup-card:hover {
  border-color: var(--primary-400);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 8px;
  height: 50px;
  width: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 8px;
}

.card-icon svg {
  width: 32px;
  height: 32px;
  stroke: #9a83d0;
}

.card-text {
  font-size: 0.875rem;
  color: var(--gray-300);
  font-weight: 600;
}

/* 浮动装饰元素 - 科技粒子 */
.floating-element {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--primary-400);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--primary-400), 0 0 20px var(--primary-400);
  animation: float 6s ease-in-out infinite;
  z-index: 1;
}

.float-1 {
  top: 20%;
  right: 15%;
  animation-delay: 0s;
  width: 6px;
  height: 6px;
}

.float-2 {
  bottom: 30%;
  right: 10%;
  animation-delay: 2s;
  width: 4px;
  height: 4px;
  background: var(--accent-400);
  box-shadow: 0 0 10px var(--accent-400), 0 0 20px var(--accent-400);
}

.float-3 {
  top: 60%;
  right: 20%;
  animation-delay: 4s;
  width: 5px;
  height: 5px;
  background: var(--secondary-400);
  box-shadow: 0 0 10px var(--secondary-400), 0 0 20px var(--secondary-400);
}

@keyframes float {
  0%, 100% {
    transform: translateY(0) translateX(0);
    opacity: 0.3;
  }
  25% {
    transform: translateY(-20px) translateX(10px);
    opacity: 0.8;
  }
  50% {
    transform: translateY(-10px) translateX(-10px);
    opacity: 0.5;
  }
  75% {
    transform: translateY(-30px) translateX(5px);
    opacity: 0.9;
  }
}

/* 背景装饰 - 科技网格 */
.hero-bg-decoration {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  background-image: 
    radial-gradient(circle at 25% 25%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

.gradient-circle {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
}

.circle-1 {
  width: 500px;
  height: 500px;
  background: var(--gradient-secondary);
  top: -150px;
  right: -100px;
  animation: pulse 4s ease-in-out infinite;
}

.circle-2 {
  width: 400px;
  height: 400px;
  background: var(--gradient-accent);
  bottom: -100px;
  left: -100px;
  animation: pulse 4s ease-in-out infinite 1s;
}

.circle-3 {
  width: 300px;
  height: 300px;
  background: var(--gradient-cyber);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: pulse 4s ease-in-out infinite 2s;
}

@keyframes pulse {
  0%, 100% {
    opacity: 0.15;
    transform: scale(1);
  }
  50% {
    opacity: 0.25;
    transform: scale(1.1);
  }
}

/* ====================================
   通用 Section 样式
   ==================================== */
section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: #2663eb;
  margin-bottom: 16px;
  -webkit-text-fill-color: transparent;
  background: var(--gradient-cyber);
  background-clip: text;
  -webkit-background-clip: text;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--gray-500);
  font-weight: 500;
}

/* ====================================
   核心特性区 - 深色科技卡片
   ==================================== */
.features {
  background: var(--gray-900);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--gray-800);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-cyber);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.feature-card:hover {
  border-color: var(--primary-400);
  transform: translateY(-8px);
  box-shadow: var(--shadow-neon);
}

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

.feature-icon {
  font-size: 3rem;
  margin-bottom: 24px;
  height: 80px;
  width: 80px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-700);
}

.feature-icon svg {
  width: 40px;
  height: 40px;
  stroke: #9a83d0;
}

.feature-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: 12px;
}

.feature-description {
  color: var(--gray-400);
  line-height: 1.7;
}

/* ====================================
   使用场景区 - 深色背景
   ==================================== */
.use-cases {
  background: var(--gray-900);
  color: white;
}

.use-cases .section-subtitle {
  color: var(--gray-400);
}

.use-case-card {
  background: var(--gray-800);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
  color: white;
}

.use-case-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-cyber);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.use-case-card:hover {
  border-color: var(--primary-400);
  transform: translateY(-8px);
  box-shadow: var(--shadow-neon);
}

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

.use-case-title {
  color: white;
}

.use-case-description {
  color: var(--gray-300);
}

.use-case-list li {
  color: var(--gray-300);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.use-case-card {
  background: var(--gray-800);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
  color: white;
}

.use-case-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-cyber);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.use-case-card:hover {
  border-color: var(--primary-400);
  transform: translateY(-8px);
  box-shadow: var(--shadow-neon);
}

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

.use-case-icon {
  font-size: 3rem;
  margin-bottom: 24px;
  height: 80px;
  width: 80px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-700);
}

.use-case-icon svg {
  width: 40px;
  height: 40px;
  stroke: #9a83d0;
}

.use-case-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: 12px;
}

.use-case-description {
  color: var(--gray-400);
  margin-bottom: 20px;
  line-height: 1.7;
}

.use-case-list {
  list-style: none;
  padding: 0;
  text-align: left;
  display: inline-block;
}

.use-case-list li {
  color: var(--gray-400);
  padding: 8px 0;
  font-weight: 500;
}

/* ====================================
   安装引导区 - 深色背景
   ==================================== */
.install {
  background: var(--gray-800);
  color: white;
}

.install .section-title {
  color: #7450a9;
  -webkit-text-fill-color: transparent;
  background: var(--gradient-cyber);
  background-clip: text;
  -webkit-background-clip: text;
}

.install .section-subtitle {
  color: var(--gray-400);
}

.step-title {
  color: white;
}

.step-description {
  color: var(--gray-300);
}

.install-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 64px;
}

.install-step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-number {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  color: white;
  font-size: 1.75rem;
  font-weight: 800;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-lg);
}

.step-content {
  flex: 1;
}

.step-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: white;
  margin-bottom: 8px;
}

.step-description {
  color: var(--gray-400);
  line-height: 1.7;
}

.install-actions {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* ====================================
   技术架构区 - 深色背景
   ==================================== */
.tech-stack {
  background: var(--gray-900);
  color: white;
}

.tech-stack .section-title {
  color: #2663eb;
  -webkit-text-fill-color: transparent;
  background: var(--gradient-cyber);
  background-clip: text;
  -webkit-background-clip: text;
}

.tech-stack .section-subtitle {
  color: var(--gray-400);
}

.tech-item {
  background: var(--gray-800);
  border-color: var(--gray-700);
  color: white;
}

.tech-item:hover {
  border-color: var(--primary-400);
}

.tech-name {
  color: white;
}

.tech-desc {
  color: var(--gray-300);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.tech-item {
  background: var(--gray-800);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: var(--transition-base);
  border: 1px solid var(--gray-700);
}

.tech-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-neon);
  border-color: var(--primary-400);
}

.tech-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  height: 70px;
  width: 70px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-700);
  margin: 0 auto 16px;
}

.tech-icon svg {
  width: 36px;
  height: 36px;
  stroke: #9a83d0;
}

.tech-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
  margin-bottom: 8px;
}

.tech-desc {
  color: var(--gray-400);
  font-size: 0.95rem;
}

/* ====================================
   页脚 - 更深色
   ==================================== */
.footer {
  background: var(--gray-950, #0a0f1a);
  color: white;
  padding: 60px 0 30px;
  border-top: 1px solid var(--gray-800);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}

.footer-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: white;
}

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

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--gray-300);
  text-decoration: none;
  transition: var(--transition-fast);
}

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

.footer-license {
  color: var(--gray-300);
  line-height: 1.7;
}

.footer-license a {
  color: var(--primary-400);
  text-decoration: none;
}

.footer-license a:hover {
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--gray-700);
  padding-top: 30px;
  text-align: center;
}

.footer-bottom p {
  color: var(--gray-400);
  margin-bottom: 8px;
}

.footer-made-with {
  font-size: 0.875rem;
  color: var(--gray-500);
}

/* ====================================
   淡入动画
   ==================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ====================================
   响应式设计
   ==================================== */

/* 平板 */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-title {
    font-size: 2.75rem;
  }
  
  .hero-subtitle-main {
    font-size: 1.75rem;
  }
  
  .features-grid,
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .use-cases-grid {
    grid-template-columns: 1fr;
  }
  
  .install-steps {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* 手机 */
@media (max-width: 768px) {
  /* 移动端隐藏导航栏标题，只保留logo */
  .nav-title {
    display: none;
  }
  
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--gray-900);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    box-shadow: var(--shadow-lg);
    border-bottom: 1px solid var(--gray-800);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .hero {
    padding: 120px 0 60px;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle-main {
    font-size: 1.5rem;
  }
  
  .hero-description {
    font-size: 1rem;
  }
  
  .hero-actions {
    flex-direction: column;
  }
  
  .hero-stats {
    flex-wrap: wrap;
    gap: 16px;
  }
  
  .stat-divider {
    display: none;
  }
  
  .features-grid,
  .tech-grid {
    grid-template-columns: 1fr;
  }
  
  .section-title {
    font-size: 2rem;
    -webkit-text-fill-color: transparent;
    background: var(--gradient-cyber);
    background-clip: text;
    -webkit-background-clip: text;
    color: white;
  }
  
  section {
    padding: 60px 0;
  }
  
  .mockup-window {
    transform: none;
  }
  
  .floating-element {
    display: none;
  }
}