/* 
 * 小水智能体 (xsAIWatch) 官方网站样式表
 * 版本：1.0
 * 创建时间：2026-03-07
 */

/* ============================================
   CSS 变量（主题色）
   ============================================ */
:root {
  /* 主色调 - 科技蓝 */
  --primary-color: #1D4ED8;
  --primary-light: #3B82F6;
  --primary-dark: #1E40AF;
  
  /* 辅助色 */
  --accent-color: #06B6D4;
  --warm-color: #F59E0B;
  --success-color: #10B981;
  
  /* 中性色 */
  --text-primary: #1F2937;
  --text-secondary: #4B5563;
  --text-light: #9CA3AF;
  --bg-white: #FFFFFF;
  --bg-light: #F9FAFB;
  --bg-gray: #F3F4F6;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* 圆角 */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-heading: var(--font-sans);
  
  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  line-height: 1.6;
  background-color: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

/* ============================================
   容器
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-narrow {
  max-width: 960px;
}

.container-wide {
  max-width: 1440px;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: box-shadow var(--transition-normal);
}

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

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

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.navbar-brand img {
  height: 40px;
  width: auto;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.navbar-link {
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--spacing-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

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

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

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

.navbar-link.active {
  color: var(--primary-color);
  font-weight: 600;
}

.navbar-link.active::after {
  width: 100%;
}

.navbar-cta {
  background: var(--primary-color);
  color: white !important;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.navbar-cta:hover {
  background: var(--primary-dark);
  color: white !important;
  transform: translateY(-1px);
}

.navbar-cta::after {
  display: none;
}

/* 移动端菜单按钮 */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.navbar-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
  padding-top: calc(72px + var(--spacing-2xl));
  padding-bottom: var(--spacing-2xl);
  background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-white) 100%);
  overflow: hidden;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: var(--primary-color);
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.hero-title .highlight {
  color: var(--primary-color);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.hero-features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.hero-feature svg {
  width: 20px;
  height: 20px;
  color: var(--success-color);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

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

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

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

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

.hero-image {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-placeholder {
  width: 100%;
  max-width: 500px;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-color));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  font-weight: 600;
  box-shadow: var(--shadow-xl);
}

/* ============================================
   特性区域
   ============================================ */
.features {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-white);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-tag {
  display: inline-block;
  color: var(--primary-color);
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.feature-card {
  background: var(--bg-white);
  border: 1px solid var(--bg-gray);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  color: white;
}

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

.feature-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ============================================
   智能体区域
   ============================================ */
.agents {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-light);
}

.agents-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.agent-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  text-align: center;
  transition: all var(--transition-normal);
  border: 2px solid transparent;
}

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

.agent-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-sm);
  background: var(--bg-gray);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
}

.agent-name {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.agent-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ============================================
   场景区域
   ============================================ */
.scenarios {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-white);
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.scenario-card {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-lg);
  align-items: center;
  background: var(--bg-light);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.scenario-card:hover {
  box-shadow: var(--shadow-md);
}

.scenario-card.reverse {
  grid-template-columns: 1.5fr 1fr;
}

.scenario-card.reverse .scenario-content {
  order: 2;
}

.scenario-card.reverse .scenario-image {
  order: 1;
}

.scenario-image-placeholder {
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-color));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
}

.scenario-tag {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

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

.scenario-description {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.scenario-example {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  font-size: 0.9rem;
  border-left: 3px solid var(--primary-color);
}

.scenario-example strong {
  color: var(--primary-color);
}

/* ============================================
   硬件规格
   ============================================ */
.specs {
  padding: var(--spacing-2xl) 0;
  background: linear-gradient(135deg, var(--text-primary) 0%, #374151 100%);
  color: white;
}

.specs .section-tag {
  color: var(--accent-color);
}

.specs .section-title {
  color: white;
}

.specs .section-subtitle {
  color: rgba(255, 255, 255, 0.8);
}

.specs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.spec-card {
  text-align: center;
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}

.spec-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.spec-title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.spec-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color);
}

/* ============================================
   CTA 区域
   ============================================ */
.cta {
  padding: var(--spacing-2xl) 0;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  text-align: center;
}

.cta-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.cta-description {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

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

.btn-white:hover {
  background: var(--bg-light);
  color: var(--primary-dark);
}

.btn-outline-white {
  background: transparent;
  color: white;
  border: 2px solid white;
}

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

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--text-primary);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand {
  margin-bottom: var(--spacing-md);
}

.footer-brand-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: var(--spacing-sm);
}

.footer-brand-desc {
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.footer-social {
  display: flex;
  gap: var(--spacing-sm);
}

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

.footer-social-link:hover {
  background: var(--primary-color);
  color: white;
}

.footer-title {
  font-weight: 600;
  color: white;
  margin-bottom: var(--spacing-md);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-copyright {
  font-size: 0.875rem;
}

.footer-legal {
  display: flex;
  gap: var(--spacing-lg);
  font-size: 0.875rem;
}

.footer-legal a {
  color: rgba(255, 255, 255, 0.8);
}

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

/* 平板 (768px - 1024px) */
@media (max-width: 1024px) {
  /* 适度放大图标 */
  .feature-icon {
    width: 64px;
    height: 64px;
  }
  
  .feature-icon svg {
    width: 32px;
    height: 32px;
  }
  
  .agent-icon {
    width: 72px;
    height: 72px;
    font-size: 2rem;
  }
  
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-content {
    order: 2;
  }
  
  .hero-image {
    order: 1;
  }
  
  .hero-features {
    justify-content: center;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .agents-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .scenarios-grid {
    grid-template-columns: 1fr;
  }
  
  .scenario-card,
  .scenario-card.reverse {
    grid-template-columns: 1fr;
  }
  
  .scenario-card.reverse .scenario-content {
    order: 1;
  }
  
  .scenario-card.reverse .scenario-image {
    order: 2;
  }
  
  .specs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 手机 (max-width: 768px) */
@media (max-width: 768px) {
  :root {
    --spacing-2xl: 2.5rem;
    --spacing-xl: 2rem;
  }
  
  /* 放大图标尺寸 */
  .feature-icon {
    width: 72px;
    height: 72px;
  }
  
  .feature-icon svg {
    width: 36px;
    height: 36px;
  }
  
  .agent-icon {
    width: 80px;
    height: 80px;
    font-size: 2.25rem;
  }
  
  .spec-icon {
    font-size: 3rem;
  }
  
  .feature-icon-large {
    width: 80px;
    height: 80px;
    font-size: 3rem;
  }
  
  .navbar-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
  }
  
  .navbar-menu.active {
    display: flex;
  }
  
  .navbar-toggle {
    display: flex;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .agents-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .specs-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
  }
  
  .spec-card {
    padding: var(--spacing-md);
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  /* 优化底部信息展示 */
  .footer {
    padding: var(--spacing-xl) 0 var(--spacing-md);
  }
  
  .footer-brand-title {
    font-size: 1.25rem;
  }
  
  .footer-brand-desc {
    font-size: 0.9rem;
  }
  
  .footer-title {
    font-size: 1.1rem;
    margin-top: var(--spacing-md);
  }
  
  .footer-links {
    gap: var(--spacing-sm);
  }
  
  .footer-links a {
    font-size: 0.95rem;
  }
  
  .footer-social {
    margin-top: var(--spacing-md);
  }
  
  .footer-social-link {
    width: 44px;
    height: 44px;
    font-size: 1.25rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }
  
  .footer-copyright {
    font-size: 0.85rem;
  }
  
  .footer-legal {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
  }
  
  .footer-legal a {
    font-size: 0.85rem;
  }
}

/* 小手机 (max-width: 480px) */
@media (max-width: 480px) {
  .agents-grid {
    grid-template-columns: 1fr;
  }
  
  .specs-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .cta .btn {
    width: 100%;
    max-width: 300px;
  }
}

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

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

/* 滚动动画类 */
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.scroll-animate.visible {
  opacity: 1;
  transform: translateY(0);
}