/* ========================================
   全站公共样式 /public/common.css
   统一头部、底部及通用组件样式
   ======================================== */

/* ---------- 全局重置 ---------- */
*,
*::before,
*::after {
  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;
  line-height: 1.6;
  color: #333;
  background-color: #f8f9fa;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  text-decoration: none;
  color: #0066cc;
  transition: color 0.2s ease;
}

a:hover {
  color: #004c99;
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

/* ---------- 公共头部样式 ---------- */
.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid #e9ecef;
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: box-shadow 0.2s ease;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Logo 样式 */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #212529;
}

.logo:hover {
  text-decoration: none;
}

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

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: #212529;
  letter-spacing: -0.3px;
}

/* 主导航样式 */
.main-nav {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-dropdown {
  position: relative;
}

.dropdown-toggle {
  background-color: #f1f3f5;
  color: #212529;
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.dropdown-toggle:hover {
  background-color: #e9ecef;
}

.toggle-icon {
  font-size: 12px;
  transition: transform 0.2s ease;
}

.nav-dropdown:hover .toggle-icon {
  transform: rotate(180deg);
}

/* 下拉菜单样式 */
.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  background-color: #ffffff;
  min-width: 240px;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  z-index: 1001;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown.active .dropdown-menu {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.dropdown-menu a {
  display: block;
  padding: 12px 18px;
  color: #212529;
  font-size: 14px;
  transition: background-color 0.15s ease;
}

.dropdown-menu a:hover {
  background-color: #f8f9fa;
  text-decoration: none;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1002;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 3px;
  background-color: #212529;
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ---------- 公共底部样式 ---------- */
.site-footer {
  background-color: #ffffff;
  border-top: 1px solid #e9ecef;
  padding: 48px 0 24px;
  margin-top: auto;
}

.footer-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 32px;
}

.footer-column {
  padding: 0 10px;
}

.footer-heading {
  font-size: 16px;
  color: #212529;
  margin-bottom: 18px;
  font-weight: 600;
  padding-bottom: 10px;
  border-bottom: 2px solid #f1f3f5;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #6c757d;
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #0066cc;
  text-decoration: none;
}



.footer-copyright {
  max-width: 1200px;
  margin: 40px auto 0;
  padding: 24px 20px 0;
  text-align: center;
  border-top: 1px solid #e9ecef;
  color: #6c757d;
  font-size: 14px;
}

.footer-copyright p {
  margin: 4px 0;
}

.footer-tagline {
  font-size: 13px;
  color: #adb5bd;
}

/* ----------  Toast 提示框样式 ---------- */
#common-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.85);
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

#common-toast.show {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- 响应式适配 ---------- */
@media (max-width: 1200px) {
  .footer-container {
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }
}

@media (max-width: 992px) {
  .footer-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 768px) {
  /* 头部适配 */
  .header-container {
    flex-wrap: wrap;
  }

  .main-nav {
    width: 100%;
    order: 3;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .main-nav.open {
    max-height: 500px;
    margin-top: 12px;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .nav-dropdown {
    width: 100%;
  }

  .dropdown-toggle {
    width: 100%;
    justify-content: space-between;
    padding: 14px 16px;
    border-radius: 0;
    background: none;
    border-bottom: 1px solid #f1f3f5;
  }

  .dropdown-toggle:hover {
    background-color: #f8f9fa;
  }

  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-bottom: 1px solid #f1f3f5;
    min-width: 100%;
    border-radius: 0;
    background-color: #fafafa;
    opacity: 1;
    transform: none;
  }

  .dropdown-menu a {
    padding-left: 32px;
  }

  /* 底部适配 */
  .footer-container {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-column {
    padding: 0;
    border-bottom: 1px solid #f1f3f5;
    padding-bottom: 20px;
  }

  .footer-column:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  .footer-copyright {
    margin-top: 24px;
  }
}

@media (max-width: 480px) {
  .header-container {
    padding: 0 16px;
  }

  .logo-text {
    font-size: 18px;
  }

  .logo-img {
    height: 36px;
  }

  .footer-container {
    padding: 0 16px;
  }

  .footer-copyright {
    padding: 20px 16px 0;
  }
}