/* 全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #5b3fe0;
  --primary-dark: #442bb9;
  --primary-light: #7a5cff;
  --secondary-color: #6a4fd8;
  --text-dark: #2d3748;
  --text-light: #718096;
  --bg-light: #f7fafc;
  --bg-white: #ffffff;
  --gradient-1: linear-gradient(135deg, #5b3fe0 0%, #7a5cff 100%);
  --gradient-2: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
  background-color: var(--bg-light);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 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: all 0.3s ease;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: cover;
}

.logo-text {
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-1);
  border-radius: 2px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: var(--primary-color);
  border-radius: 3px;
  transition: all 0.3s ease;
}

/* 英雄区域 */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 20px 80px;
  background: var(--gradient-1);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  color: white;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.gradient-text {
  background: linear-gradient(135deg, #fff 0%, #e0e7ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.95;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
}

.btn {
  padding: 14px 32px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-block;
  border: 2px solid transparent;
}

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

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

.btn-secondary {
  background: transparent;
  color: white;
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: white;
}

.hero-stats {
  display: flex;
  gap: 3rem;
}

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

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

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

.hero-image {
  position: relative;
  height: 500px;
}

.floating-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 1.5rem;
  border-radius: 20px;
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  animation: float 3s ease-in-out infinite;
}

.card-1 {
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.card-2 {
  top: 50%;
  right: 10%;
  animation-delay: 1s;
}

.card-3 {
  bottom: 10%;
  left: 30%;
  animation-delay: 2s;
}

.card-icon {
  font-size: 2.5rem;
}

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

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

.hero-wave {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  color: var(--bg-light);
}

/* 功能区域 */
.features {
  padding: 80px 20px;
  background: var(--bg-light);
}

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

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 1rem;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: white;
  padding: 2.5rem;
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
}

.feature-icon {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
}

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

.feature-description {
  color: var(--text-light);
  line-height: 1.8;
}

/* 使用场景 */
.scenarios {
  padding: 80px 20px;
  background: white;
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.scenario-card {
  background: var(--gradient-1);
  padding: 2.5rem;
  border-radius: 20px;
  color: white;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.scenario-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
}

.scenario-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.scenario-card:hover::before {
  opacity: 1;
}

.scenario-number {
  font-size: 4rem;
  font-weight: 800;
  opacity: 0.3;
  margin-bottom: 1rem;
}

.scenario-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.scenario-description {
  line-height: 1.8;
  opacity: 0.95;
}

/* 关于我们 */
.about {
  padding: 80px 20px;
  background: var(--bg-light);
}

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

.about-description {
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.about-features {
  margin-top: 2rem;
}

.about-feature-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.check-icon {
  width: 30px;
  height: 30px;
  background: var(--gradient-1);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.about-image {
  position: relative;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-card {
  background: white;
  padding: 3rem;
  border-radius: 20px;
  box-shadow: var(--shadow-xl);
  text-align: center;
  animation: float 3s ease-in-out infinite;
}

.about-card-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.about-card-text {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-color);
}

/* 聊天区域 */
.chat-section {
  padding: 80px 20px;
  background: white;
}

.chat-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.chat-preview {
  margin-top: 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.chat-message {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  animation: slideIn 0.5s ease;
}

.user-message {
  flex-direction: row-reverse;
}

.message-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.user-message .message-avatar {
  background: var(--gradient-1);
}

.ai-message .message-avatar {
  background: var(--bg-light);
}

.message-content {
  max-width: 70%;
  padding: 1rem 1.5rem;
  border-radius: 20px;
  line-height: 1.6;
}

.user-message .message-content {
  background: var(--gradient-1);
  color: white;
  border-bottom-right-radius: 5px;
}

.ai-message .message-content {
  background: var(--bg-light);
  color: var(--text-dark);
  border-bottom-left-radius: 5px;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 联系我们 */
.contact {
  padding: 80px 20px;
  background: var(--bg-light);
}

.contact-content {
  max-width: 800px;
  margin: 0 auto;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.contact-item {
  background: white;
  padding: 2rem;
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  display: flex;
  gap: 1.5rem;
  align-items: center;
  transition: all 0.3s ease;
}

.contact-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.contact-icon {
  font-size: 2.5rem;
  width: 70px;
  height: 70px;
  background: var(--gradient-1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-details h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

.contact-details p {
  color: var(--text-light);
}

/* 页脚 */
.footer {
  background: var(--text-dark);
  color: white;
  padding: 60px 20px 30px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 1rem;
}

.footer-description {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}

.footer-title {
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

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

.footer-links li {
  margin-bottom: 0.8rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
}

.disclaimer-text {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
}

/* 聊天启动按钮 */
.chat-launcher {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 60px;
  height: 60px;
  background: var(--gradient-1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-xl);
  cursor: pointer;
  z-index: 999;
  transition: all 0.3s ease;
  color: white;
}

.chat-launcher:hover {
  transform: scale(1.1);
  box-shadow: 0 25px 50px rgba(91, 63, 224, 0.4);
}

.chat-launcher svg {
  width: 28px;
  height: 28px;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background: white;
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: var(--shadow-lg);
    padding: 2rem 0;
    gap: 0;
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-link {
    padding: 1rem;
    display: block;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .hero-stats {
    justify-content: center;
    gap: 2rem;
  }

  .hero-image {
    height: 300px;
    margin-top: 2rem;
  }

  .floating-card {
    padding: 1rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .features-grid,
  .scenarios-grid {
    grid-template-columns: 1fr;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

  .about-image {
    height: 300px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 300px;
    text-align: center;
  }

  .chat-launcher {
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .stat-number {
    font-size: 2rem;
  }

  .feature-card,
  .scenario-card {
    padding: 1.5rem;
  }
}