/* 科技风格CSS - 小七AI网站 */
:root {
  --primary: #0A192F;
  --secondary: #112240;
  --accent: #64FFDA;
  --text-primary: #E6F1FF;
  --text-secondary: #8892B0;
  --card-bg: rgba(17, 34, 64, 0.6);
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航栏 */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 25, 47, 0.95);
  backdrop-filter: blur(10px);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

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

/* 英雄区域 */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
}

.hero-content {
  max-width: 600px;
  z-index: 2;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero h1 span {
  color: var(--accent);
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 30px;
  max-width: 500px;
}

.cta-buttons {
  display: flex;
  gap: 15px;
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 50px;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
}

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

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

.btn.secondary {
  background: rgba(100, 255, 218, 0.1);
  color: var(--accent);
  border: 2px solid rgba(100, 255, 218, 0.2);
}

.btn.secondary:hover {
  background: rgba(100, 255, 218, 0.2);
  border-color: var(--accent);
}

/* 3D虚拟人物容器 */
.xiaoqi-3d-container {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 400px;
  height: 400px;
  z-index: 1;
}

.xiaoqi-canvas {
  width: 100%;
  height: 100%;
  border-radius: 20px;
  background: rgba(17, 34, 64, 0.3);
  box-shadow: 0 0 30px rgba(100, 255, 218, 0.2);
}

/* 功能区域 */
.features {
  padding: 100px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.section-title p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: 15px;
  padding: 30px;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(100, 255, 218, 0.3);
}

.feature-icon {
  font-size: 2.5rem;
  color: var(--accent);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

.feature-card p {
  color: var(--text-secondary);
}

/* AI交互区域 */
.demo {
  padding: 100px 0;
  background: var(--secondary);
}

.chat-interface {
  max-width: 800px;
  margin: 0 auto;
  background: var(--card-bg);
  border-radius: 20px;
  padding: 40px;
  border: 1px solid rgba(100, 255, 218, 0.1);
}

.chat-messages {
  height: 300px;
  background: rgba(10, 25, 47, 0.5);
  border-radius: 15px;
  padding: 20px;
  margin-bottom: 20px;
  overflow-y: auto;
}

.message {
  margin-bottom: 15px;
  padding: 10px 15px;
  border-radius: 10px;
  max-width: 80%;
}

.user-message {
  background: rgba(100, 255, 218, 0.1);
  margin-left: auto;
  border-top-right-radius: 0;
}

.ai-message {
  background: rgba(17, 34, 64, 0.8);
  margin-right: auto;
  border-top-left-radius: 0;
}

.message-content {
  line-height: 1.5;
}

.chat-input {
  display: flex;
  gap: 10px;
}

#userInput {
  flex: 1;
  padding: 15px;
  border: 2px solid rgba(100, 255, 218, 0.2);
  border-radius: 25px;
  background: rgba(10, 25, 47, 0.5);
  color: var(--text-primary);
  font-size: 1rem;
}

#userInput:focus {
  outline: none;
  border-color: var(--accent);
}

#sendButton {
  background: var(--accent);
  color: var(--primary);
  border: none;
  padding: 15px 25px;
  border-radius: 25px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

#sendButton:hover {
  background: #53e6c2;
}

/* 关于区域 */
.about {
  padding: 100px 0;
}

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

.feature-list {
  list-style: none;
  margin-top: 20px;
}

.feature-list li {
  margin-bottom: 10px;
  padding-left: 25px;
  position: relative;
}

.feature-list li::before {
  content: "✅";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* 联系区域 */
.contact {
  padding: 100px 0;
}

.contact-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact-info {
  margin-top: 20px;
}

/* 页脚 */
.footer {
  background: var(--secondary);
  padding: 60px 0 30px;
  text-align: center;
}

.footer p {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* 响应式设计 */
@media (max-width: 1200px) {
  .xiaoqi-3d-container {
    width: 350px;
    height: 350px;
    right: 20px;
  }
}

@media (max-width: 992px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 120px;
  }
  
  .hero-content {
    margin-bottom: 50px;
    max-width: 100%;
  }
  
  .cta-buttons {
    justify-content: center;
  }
  
  .xiaoqi-3d-container {
    position: relative;
    top: 0;
    transform: none;
    margin: 0 auto;
    width: 300px;
    height: 300px;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .nav-links {
    display: none;
  }
  
  .chat-messages {
    height: 200px;
  }
  
  .xiaoqi-3d-container {
    width: 250px;
    height: 250px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
  }
  
  .xiaoqi-3d-container {
    width: 200px;
    height: 200px;
  }
}

/* 加载动画 */
.loading-dots {
  display: inline-block;
}

.loading-dots span {
  animation: loading 1.4s infinite ease-in-out both;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
  height: 8px;
  margin: 0 2px;
  width: 8px;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes loading {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}/* 3D Virtual Humanoid Styles */
.xiaoqi-humanoid-container {
    position: relative;
    width: 100%;
    height: 400px;
    margin: 0 auto;
    perspective: 1000px;
}

#xiaoqi-humanoid-canvas {
    width: 100%;
    height: 100%;
    display: block;
    background: transparent;
}

.humanoid-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--accent);
    font-size: 1.2rem;
    text-align: center;
}

.humanoid-error {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #ff6b6b;
    font-size: 1rem;
    text-align: center;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .xiaoqi-humanoid-container {
        height: 300px;
    }
    
    .humanoid-loading,
    .humanoid-error {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .xiaoqi-humanoid-container {
        height: 250px;
    }
}