/* 活着么 (I'm Okay) - 网站样式 */

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

:root {
  --primary-color: #4CAF50;
  --primary-dark: #45a049;
  --text-dark: #333333;
  --text-light: #666666;
  --bg-light: #F5F5F5;
  --bg-white: #FFFFFF;
  --border-color: #E0E0E0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 4px 16px rgba(76, 175, 80, 0.2);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
  background-color: var(--bg-white);
}

/* 导航栏 */
.navbar {
  background-color: var(--bg-white);
  box-shadow: var(--shadow);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 600;
  font-size: 1.25rem;
}

.nav-logo img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-dark);
  text-decoration: none;
  transition: color 0.3s;
  font-weight: 500;
}

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

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* 英雄区域 */
.hero {
  padding: 4rem 0;
  text-align: center;
  background: linear-gradient(135deg, #ffffff 0%, #e8f5e9 50%, #c8e6c9 100%);
}

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

.hero-logo {
  height: 120px;
  width: auto;
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-light);
  margin-bottom: 1rem;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-light);
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

/* 功能区域 */
.features {
  padding: 4rem 0;
  background-color: var(--bg-white);
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--text-dark);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

.feature-card {
  background: var(--bg-white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

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

/* 截图展示 */
.screenshots {
  padding: 4rem 0;
  background-color: var(--bg-light);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  max-width: 1000px;
  margin: 0 auto;
}

.screenshot-item {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}

.screenshot-item:hover {
  transform: scale(1.05);
}

.screenshot-item img {
  width: 100%;
  height: auto;
  display: block;
}

/* 目标用户 */
.target-users {
  padding: 4rem 0;
  background-color: var(--bg-white);
}

.target-users-list {
  max-width: 800px;
  margin: 0 auto;
  list-style: none;
}

.target-users-list li {
  padding: 1.5rem;
  margin-bottom: 1rem;
  background: var(--bg-light);
  border-radius: 8px;
  border-left: 4px solid var(--primary-color);
  font-size: 1.125rem;
}

/* CTA区域 */
.cta {
  padding: 4rem 0;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  text-align: center;
}

.cta h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

/* 页脚 */
.footer {
  background-color: var(--text-dark);
  color: white;
  padding: 2rem 0;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
  list-style: none;
}

.footer-links a {
  color: white;
  text-decoration: none;
  transition: color 0.3s;
}

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

.footer-copyright {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
}

/* 内容页面样式 */
.content-page {
  padding: 3rem 0;
  min-height: calc(100vh - 200px);
}

.content-page h1 {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  color: var(--text-dark);
}

.content-page h2 {
  font-size: 1.75rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.content-page h3 {
  font-size: 1.5rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-dark);
}

.content-page p {
  margin-bottom: 1rem;
  color: var(--text-light);
  line-height: 1.8;
}

.content-page ul,
.content-page ol {
  margin-left: 2rem;
  margin-bottom: 1rem;
  color: var(--text-light);
  line-height: 1.8;
}

.content-page li {
  margin-bottom: 0.5rem;
}

.content-page strong {
  color: var(--text-dark);
}

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

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }

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

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

  .screenshots-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-links {
    flex-wrap: nowrap;
    gap: 1rem;
    font-size: 0.9rem;
  }
}