/* ================================================================
   岳西人网 - 基础公共样式 (base.css)
   所有页面必须首先引用此文件
   包含：CSS变量、重置样式、工具类、通用组件
   ================================================================ */

/* --- CSS变量定义 --- */
:root {
  /* 主色 - 橙色科技感 */
  --primary: #FF6B00;
  --primary-light: #FF8C35;
  --primary-dark: #E55A00;
  --primary-ultra-light: #FFF4EC;
  --primary-gradient: linear-gradient(135deg, #FF6B00 0%, #FF9A3C 100%);

  /* 辅助色 */
  --accent-blue: #0EA5E9;
  --accent-green: #10B981;
  --accent-purple: #8B5CF6;

  /* 中性色 */
  --dark: #0D1117;
  --dark-2: #161B22;
  --dark-3: #1C2333;
  --text-primary: #1A1A2E;
  --text-secondary: #4B5563;
  --text-muted: #9CA3AF;
  --text-1: #1A1A2E;
  --text-2: #4B5563;
  --text-3: #6B7280;
  --text-4: #9CA3AF;
  --border: #E5E7EB;
  --border-light: #F3F4F6;
  --bg: #F9FAFB;
  --bg-white: #FFFFFF;
  --bg-light: #F3F4F6;

  /* 排版 */
  --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;

  /* 圆角 */
  --radius-sm: 6px;
  --radius: 12px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.12), 0 8px 24px rgba(0,0,0,0.08);
  --shadow-primary: 0 8px 30px rgba(255,107,0,0.25);
  --shadow-primary-lg: 0 16px 48px rgba(255,107,0,0.30);

  /* 过渡 */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);

  /* 内容宽度 */
  --container: 1200px;
  --container-lg: 1400px;
}

/* --- 全局重置 --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-y: scroll; /* 始终显示垂直滚动条，防止页面切换时宽度跳动 */
}

body {
  background-color: var(--bg);
  font-family: var(--font-sans);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

/* --- 容器系统 --- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

.section-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

/* --- 页面区块 --- */
.page-section {
  padding: 80px 0;
}

.page-section.bg-light {
  background-color: var(--bg-light);
}

/* --- 标题系统 --- */
.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 14px;
  font-family: var(--font-heading);
  letter-spacing: -0.5px;
}

.section-title p {
  font-size: 17px;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- 按钮系统 --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary-gradient);
  color: #fff;
  padding: 13px 32px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  box-shadow: var(--shadow-primary);
  letter-spacing: 0.5px;
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary-lg);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--primary);
  padding: 12px 30px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  border: 2px solid var(--primary);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

/* --- Tab 组件 --- */
.tabs-box {
  display: flex;
  justify-content: center;
}

.tabs-box .tabs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  margin: 24px auto 0;
  border-bottom: 2px solid var(--border);
  background: var(--bg-white);
  border-radius: var(--radius) var(--radius) 0 0;
  overflow: hidden;
}

.tabs-box .tabs li {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  line-height: 1;
  height: 70px;
  position: relative;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  letter-spacing: 1px;
  transition: color var(--transition-fast);
}

.tabs-box .tabs li:hover {
  color: var(--primary);
  background: var(--primary-ultra-light);
}

.tabs-box .tabs .selected {
  color: var(--primary);
  background: var(--primary-ultra-light);
}

.tabs-box .tabs .selected::after {
  content: '';
  height: 3px;
  background: var(--primary-gradient);
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  border-radius: 2px 2px 0 0;
}

/* --- 响应式断点 --- */
@media (max-width: 1280px) {
  .container,
  .section-inner {
    padding: 0 30px;
  }
}

@media (max-width: 960px) {
  .container,
  .section-inner {
    padding: 0 24px;
  }
  
  .page-section {
    padding: 60px 0;
  }
  
  .section-title h2 {
    font-size: 28px;
  }
}

@media (max-width: 750px) {
  .page-section {
    padding: 50px 0;
  }
  
  .section-title {
    margin-bottom: 36px;
  }
  
  .section-title h2 {
    font-size: 24px;
  }
  
  .section-title p {
    font-size: 14px;
  }
  
  .container,
  .section-inner {
    padding: 0 16px;
  }
}