/* ==========================================
   Sinma.Net 主页样式
   简洁 · 清晰 · 响应式
   ========================================== */

/* 基础重置与变量 */
:root {
  --color-primary: #2c3e50;
  --color-accent: #e74c3c;
  --color-bg: #f5f7fa;
  --color-card: #ffffff;
  --color-text: #333333;
  --color-text-secondary: #666666;
  --color-border: #e8eaed;
  --color-link-bg: #f0f4f8;
  --color-link-hover: #e74c3c;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --radius: 8px;
  --max-width: 900px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

img {
  max-width: 100%;
  height: auto;
}

/* 头部区域 */
.site-header {
  text-align: center;
  padding: 50px 20px 30px;
  background: linear-gradient(180deg, #ffffff 0%, var(--color-bg) 100%);
}

.logo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  margin-bottom: 20px;
}

.site-title {
  margin: 0;
  font-size: 1.8em;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 1px;
}

.site-subtitle {
  margin: 10px 0 0;
  font-size: 1em;
  color: var(--color-text-secondary);
  font-weight: 400;
}

/* 简介区域 */
.intro-section {
  max-width: var(--max-width);
  margin: 0 auto 30px;
  padding: 0 20px;
}

.intro-card {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 25px 30px;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--color-accent);
}

.intro-card p {
  margin: 0;
  line-height: 1.8;
  color: var(--color-text);
}

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

/* 主体内容 */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px 40px;
}

.section-card {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 30px;
  margin-bottom: 25px;
  box-shadow: var(--shadow-sm);
}

.section-title {
  margin: 0 0 10px;
  font-size: 1.3em;
  font-weight: 600;
  color: var(--color-primary);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 20px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.section-desc {
  margin: 0 0 20px;
  color: var(--color-text-secondary);
  font-size: 0.95em;
  line-height: 1.7;
}

/* 链接网格 */
.link-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.link-tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background-color: var(--color-link-bg);
  border-radius: 20px;
  font-size: 0.95em;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  transition: all 0.2s ease;
}

.link-tag:hover {
  background-color: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.link-tag p {
  margin: 0;
}

/* 附加链接 */
.extra-link {
  text-align: center;
  margin-top: 10px;
}

.extra-link a {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-card);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  font-size: 0.95em;
  transition: all 0.2s ease;
}

.extra-link a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* 页脚 */
.site-footer {
  text-align: center;
  padding: 30px 20px;
  background-color: #ffffff;
  border-top: 1px solid var(--color-border);
}

.site-footer p {
  margin: 0 0 15px;
  color: var(--color-text-secondary);
  font-size: 0.9em;
}

.beian-wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin-top: 10px;
}

.beian-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--color-text-secondary);
  font-size: 0.85em;
  text-decoration: none;
}

.beian-item:hover {
  color: var(--color-accent);
}

.beian-item img {
  width: 16px;
  height: 16px;
  display: block;
}

/* 友情链接 - SEO 隐藏保留 */
#friendlink {
  display: none;
}

/* 响应式 */
@media (max-width: 600px) {
  .site-header {
    padding: 35px 15px 25px;
  }

  .logo {
    width: 110px;
    height: 110px;
  }

  .site-title {
    font-size: 1.5em;
  }

  .section-card {
    padding: 20px;
  }

  .intro-card {
    padding: 18px 20px;
  }

  .link-tag {
    padding: 6px 12px;
    font-size: 0.9em;
  }
}