/* 全局样式 - 基于Mestrelab配色方案 */
:root {
  --primary-blue: #1a365d;      /* 主蓝色 - 深蓝 */
  --accent-blue: #2b6cb0;       /* 强调蓝色 */
  --light-blue: #4299e1;        /* 浅蓝色 */
  --bg-light: #f7fafc;          /* 背景浅色 */
  --bg-white: #ffffff;          /* 白色背景 */
  --text-dark: #2d3748;         /* 深色文字 */
  --text-muted: #718096;        /* 灰色文字 */
  --border-light: #e2e8f0;      /* 浅色边框 */
  --maxw: 1200px;               /* 最大宽度 */
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  margin: 0;
  background: var(--bg-light);
  color: var(--text-dark);
  line-height: 1.6;
  font-size: 16px;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header / 导航条 - 固定在顶部 */
.site-header {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border-light);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(26, 54, 93, 0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  height: 80px;
}

.logo {
  font-weight: 700;
  color: var(--primary-blue);
  text-decoration: none;
  font-size: 1.75rem;
  letter-spacing: -0.5px;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-dark);
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 32px;
}

.main-nav a {
  text-decoration: none;
  color: var(--text-dark);
  padding: 12px 20px;
  border-radius: 6px;
  font-weight: 500;
  transition: all 0.3s ease;
  font-size: 1rem;
}

.main-nav a:hover,
.main-nav a.active {
  background: rgba(26, 54, 93, 0.08);
  color: var(--primary-blue);
}

/* 主要内容区域 */
main {
  margin-top: 80px;
  min-height: calc(100vh - 160px);
}

/* Hero 区域 */
.hero {
  padding: 100px 0 80px;
  background: linear-gradient(135deg, var(--bg-white) 0%, var(--bg-light) 100%);
  text-align: center;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-blue), var(--light-blue));
}

.hero h1 {
  margin: 0 0 20px;
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-blue);
  line-height: 1.2;
}

.hero p {
  margin: 0 0 32px;
  color: var(--text-muted);
  font-size: 1.25rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.hero-cta .btn {
  margin-top: 24px;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-blue));
  color: #fff;
  padding: 14px 32px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(26, 54, 93, 0.2);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 54, 93, 0.3);
  background: linear-gradient(135deg, var(--accent-blue), var(--light-blue));
}

/* 功能区网格布局 */
.features {
  padding: 100px 0;
  background: var(--bg-white);
}

.features h2 {
  text-align: center;
  margin: 0 0 60px;
  font-size: 2.5rem;
  color: var(--primary-blue);
  font-weight: 600;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.card {
  background: var(--bg-white);
  padding: 40px 32px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(26, 54, 93, 0.08);
  text-align: center;
  transition: all 0.3s ease;
  border: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-blue), var(--light-blue));
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 32px rgba(26, 54, 93, 0.15);
}

.card h3 {
  margin: 0 0 20px;
  color: var(--primary-blue);
  font-size: 1.5rem;
  font-weight: 600;
}

.card p {
  margin: 0 0 24px;
  color: var(--text-muted);
  line-height: 1.6;
  font-size: 1.05rem;
}

.card a:not(.btn) {
  color: var(--accent-blue);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
  font-size: 1rem;
}

.card a:not(.btn):hover {
  color: var(--light-blue);
}

.btn:hover {
  color: #fff;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-light);
  background: var(--primary-blue);
  padding: 40px 0;
  margin-top: 0;
}

.site-footer p {
  margin: 0;
  color: rgba(255, 255, 255, 0.8);
  text-align: center;
  font-size: 0.95rem;
}

/* 联系页面布局 */
.contact-page {
  padding: 80px 0;
  background: var(--bg-light);
}

.contact-page h1 {
  text-align: center;
  margin: 0 0 60px;
  font-size: 2.5rem;
  color: var(--primary-blue);
  font-weight: 600;
}

.contact-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact-form {
  background: var(--bg-white);
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(26, 54, 93, 0.08);
  border: 1px solid var(--border-light);
}

.contact-form h2 {
  margin: 0 0 30px;
  color: var(--primary-blue);
  font-size: 1.75rem;
  font-weight: 600;
}

.contact-form label {
  display: block;
  margin-bottom: 20px;
  font-weight: 500;
  color: var(--text-dark);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.3s ease;
  background: var(--bg-light);
  margin-top: 8px;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(43, 108, 176, 0.1);
}

.contact-form textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-info {
  background: var(--bg-white);
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(26, 54, 93, 0.08);
  border: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.contact-info::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-blue), var(--light-blue));
}

.contact-info h2 {
  margin: 0 0 30px;
  color: var(--primary-blue);
  font-size: 1.75rem;
  font-weight: 600;
}

.contact-info p {
  margin: 0 0 20px;
  color: var(--text-muted);
  line-height: 1.6;
}

.contact-info strong {
  color: var(--text-dark);
  font-weight: 600;
}

.contact-info a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.3s ease;
}

.contact-info a:hover {
  color: var(--light-blue);
}

.form-msg {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 6px;
  font-weight: 500;
  text-align: center;
}

.form-msg.success {
  background: rgba(72, 187, 120, 0.1);
  color: #38a169;
  border: 1px solid rgba(72, 187, 120, 0.2);
}

.form-msg.error {
  background: rgba(245, 101, 101, 0.1);
  color: #e53e3e;
  border: 1px solid rgba(245, 101, 101, 0.2);
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .features h2 {
    font-size: 2.25rem;
  }
  
  .grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
  }
  
  .contact-grid {
    gap: 40px;
  }
}

@media (max-width: 800px) {
  .header-inner {
    padding: 0 16px;
    height: 70px;
  }
  
  .logo {
    font-size: 1.5rem;
  }
  
  main {
    margin-top: 70px;
  }
  
  .hero {
    padding: 80px 0 60px;
  }
  
  .hero h1 {
    font-size: 2.25rem;
  }
  
  .hero p {
    font-size: 1.1rem;
  }
  
  .features {
    padding: 80px 0;
  }
  
  .features h2 {
    font-size: 2rem;
    margin-bottom: 40px;
  }
  
  .grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .card {
    padding: 32px 24px;
  }
  
  .main-nav {
    display: none;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .main-nav.open {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-white);
    padding: 24px;
    box-shadow: 0 4px 20px rgba(26, 54, 93, 0.15);
  }
  
  .main-nav.open ul {
    flex-direction: column;
    gap: 16px;
  }
  
  .main-nav.open a {
    display: block;
    padding: 16px;
    text-align: center;
    font-size: 1.1rem;
  }
}

/* 移动端小屏幕优化 */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .btn {
    padding: 12px 24px;
    font-size: 1rem;
  }
  
  .card {
    padding: 24px 20px;
  }
  
  .card h3 {
    font-size: 1.3rem;
  }
  
  .card p {
    font-size: 1rem;
  }
}

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

.card {
  animation: fadeInUp 0.6s ease-out;
}

.card:nth-child(2) {
  animation-delay: 0.1s;
}

.card:nth-child(3) {
  animation-delay: 0.2s;
}

.card:nth-child(4) {
  animation-delay: 0.3s;
}

/* 定价页面样式 */
.pricing-hero {
  padding: 100px 0 60px;
  background: linear-gradient(135deg, var(--bg-white) 0%, var(--bg-light) 100%);
  text-align: center;
  position: relative;
}

.pricing-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-blue), var(--light-blue));
}

.pricing-hero h1 {
  margin: 0 0 20px;
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-blue);
  line-height: 1.2;
}

.pricing-hero p {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.25rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.pricing-section {
  padding: 80px 0;
  background: var(--bg-light);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 40px;
  max-width: 1100px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--bg-white);
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(26, 54, 93, 0.08);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.pricing-card.featured {
  transform: scale(1.05);
  border: 2px solid var(--accent-blue);
  box-shadow: 0 8px 32px rgba(43, 108, 176, 0.15);
}

.featured-badge {
  position: absolute;
  top: 0;
  right: 0;
  background: linear-gradient(135deg, var(--accent-blue), var(--light-blue));
  color: white;
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 0 0 0 12px;
}

.pricing-header {
  padding: 40px 32px 32px;
  text-align: center;
  border-bottom: 1px solid var(--border-light);
}

.pricing-header h3 {
  margin: 0 0 16px;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-blue);
}

.price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
}

.amount {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-blue);
}

.period {
  font-size: 1rem;
  color: var(--text-muted);
}

.pricing-features {
  padding: 32px;
}

.pricing-features ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.pricing-features li {
  padding: 12px 0;
  color: var(--text-dark);
  font-size: 1rem;
  line-height: 1.5;
  border-bottom: 1px solid var(--border-light);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li:before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 20px;
  margin-right: 12px;
  vertical-align: middle;
}

.pricing-features li:contains('✓'):before {
  content: '✓';
  color: #38a169;
  font-weight: bold;
}

.pricing-features li:contains('✗'):before {
  content: '✗';
  color: #e53e3e;
  font-weight: bold;
}

.pricing-cta {
  padding: 0 32px 40px;
  text-align: center;
}

.btn-outline {
  background: transparent;
  color: var(--accent-blue);
  border: 2px solid var(--accent-blue);
  box-shadow: none;
}

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

/* FAQ 区域 */
.faq-section {
  padding: 80px 0;
  background: var(--bg-white);
}

.faq-section h2 {
  text-align: center;
  margin: 0 0 60px;
  font-size: 2.5rem;
  color: var(--primary-blue);
  font-weight: 600;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  max-width: 1000px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-light);
  padding: 32px;
  border-radius: 12px;
  border-left: 4px solid var(--accent-blue);
}

.faq-item h3 {
  margin: 0 0 16px;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-blue);
}

.faq-item p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 响应式设计 - 定价页面 */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
  }
  
  .pricing-card.featured {
    transform: none;
  }
}

@media (max-width: 800px) {
  .pricing-hero {
    padding: 80px 0 40px;
  }
  
  .pricing-hero h1 {
    font-size: 2.5rem;
  }
  
  .pricing-section {
    padding: 60px 0;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    max-width: 400px;
  }
  
  .faq-section {
    padding: 60px 0;
  }
  
  .faq-section h2 {
    font-size: 2rem;
    margin-bottom: 40px;
  }
  
  .faq-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 480px) {
  .pricing-hero h1 {
    font-size: 2rem;
  }
  
  .pricing-hero p {
    font-size: 1.1rem;
  }
  
  .pricing-header {
    padding: 32px 24px 24px;
  }
  
  .amount {
    font-size: 2rem;
  }
  
  .pricing-features {
    padding: 24px;
  }
  
  .pricing-cta {
    padding: 0 24px 32px;
  }
  
  .faq-item {
    padding: 24px 20px;
  }
}