/* 51租 - 全局样式 */
:root {
  --primary: #FF6B00;
  --primary-dark: #e55f00;
  --white: #FFFFFF;
  --gray-light: #F7F7F7;
  --gray: #666666;
  --gray-dark: #333333;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 24px rgba(255, 107, 0, 0.15);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--gray-dark);
  background: var(--white);
  line-height: 1.6;
}

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

/* 导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--white);
  box-shadow: var(--shadow);
  z-index: 1000;
  height: 64px;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 24px;
  font-weight: bold;
  color: var(--primary);
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  color: var(--gray-dark);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.3s;
}

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

@media (max-width: 768px) {
  .nav {
    display: none;
  }
}

/* Hero 区域 */
.hero {
  min-height: 100vh;
  background: var(--primary);
  display: flex;
  align-items: center;
  padding-top: 64px;
}

.hero-content {
  text-align: center;
  color: var(--white);
}

.hero h1 {
  font-size: 64px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.hero p {
  font-size: 22px;
  opacity: 0.95;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--gray-light);
  transform: translateY(-2px);
}

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

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

@media (max-width: 768px) {
  .hero h1 {
    font-size: 40px;
  }
  .hero p {
    font-size: 18px;
  }
}

/* 通用区块 */
.section {
  padding: 80px 0;
}

.section-gray {
  background: var(--gray-light);
}

.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--gray-dark);
  margin-bottom: 12px;
}

.section-title p {
  font-size: 16px;
  color: var(--gray);
}

/* 关于我们 */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text p {
  font-size: 16px;
  color: var(--gray);
  margin-bottom: 16px;
  line-height: 1.8;
}

.about-image img {
  width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

@media (max-width: 768px) {
  .about-content {
    grid-template-columns: 1fr;
  }
  .about-image {
    order: -1;
  }
}

/* 车型展示 */
.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.model-card {
  background: var(--white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all 0.3s;
}

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

.model-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.model-info {
  padding: 20px;
}

.model-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-dark);
  margin-bottom: 8px;
}

.model-price {
  font-size: 18px;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 8px;
}

.model-desc {
  font-size: 14px;
  color: var(--gray);
}

/* 用户故事 */
.stories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.story-card {
  background: var(--white);
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow);
  transition: all 0.3s;
}

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

.story-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 16px;
}

.story-quote {
  font-size: 16px;
  color: var(--gray-dark);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}

.story-author {
  font-size: 14px;
  color: var(--gray);
}

/* 联系我们 */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
  flex-shrink: 0;
}

.contact-text h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-dark);
  margin-bottom: 4px;
}

.contact-text p {
  font-size: 14px;
  color: var(--gray);
}

.contact-form {
  background: var(--white);
  padding: 32px;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-dark);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  font-size: 14px;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

@media (max-width: 768px) {
  .contact-content {
    grid-template-columns: 1fr;
  }
}

/* Footer */
.footer {
  background: var(--gray-dark);
  color: var(--white);
  padding: 40px 0 20px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 24px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s;
}

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

.footer-copyright {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* AI智能团队 */
.section-subtitle {
  color: #666;
  font-size: 16px;
  margin-top: 8px;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.team-card {
  background: #fff;
  border-radius: 16px;
  padding: 28px 20px;
  text-align: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
  transition: transform 0.3s, box-shadow 0.3s;
}

.team-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(255,107,0,0.15);
}

.team-avatar {
  font-size: 48px;
  margin-bottom: 12px;
}

.team-name {
  font-size: 18px;
  font-weight: 600;
  color: #1A1A1A;
  margin-bottom: 4px;
}

.team-role {
  font-size: 13px;
  color: #FF6B00;
  font-weight: 500;
  margin-bottom: 12px;
}

.team-desc {
  font-size: 13px;
  color: #888;
  line-height: 1.6;
}

.team-capabilities {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.capability-item {
  background: #F7F7F7;
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.capability-icon {
  font-size: 28px;
}

.capability-title {
  font-size: 16px;
  font-weight: 600;
  color: #1A1A1A;
}

.capability-desc {
  font-size: 13px;
  color: #888;
  line-height: 1.5;
}

@media (max-width: 1024px) {
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .team-capabilities {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .team-grid {
    grid-template-columns: 1fr;
  }
  .team-capabilities {
    grid-template-columns: 1fr;
  }
}

/* AI日记 */
.section-diary {
  background: #fff;
  border-top: 1px solid #f0f0f0;
}

.diary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.diary-card {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  border-left: 4px solid #FF6B00;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  transition: transform 0.3s, box-shadow 0.3s;
}

.diary-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(255,107,0,0.12);
}

.diary-date {
  font-size: 12px;
  color: #FF6B00;
  font-weight: 600;
  margin-bottom: 8px;
}

.diary-title {
  font-size: 16px;
  font-weight: 600;
  color: #1A1A1A;
  margin-bottom: 8px;
}

.diary-excerpt {
  font-size: 13px;
  color: #666;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

@media (max-width: 768px) {
  .diary-grid {
    grid-template-columns: 1fr;
  }
}