@charset "utf-8";
/* ========================================
   Modern Header - 2025 Design Trends
   微交互动画 + 企业风格
   Bootstrap 5 重构版本
   变量引用 vars.css
======================================== */

/* ========== Main Header ========== */
.site-header {
  position: relative;
  z-index: 1000;
}

.site-header .navbar {
  background: var(--header-bg);
  height: var(--header-height-lg);
  padding: 0;
  transition: all var(--transition-base);
}

/* Scroll Shadow Effect */
.site-header .navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

/* ========== Logo Animation ========== */
.navbar-brand {
  padding: 0;
  transition: transform var(--transition-base);
}

.navbar-brand:hover {
  transform: scale(1.02);
}

.logo-img {
  height: 45px;
  width: auto;
  transition: opacity var(--transition-fast);
}

.navbar-brand:hover .logo-img {
  opacity: 0.85;
}

/* ========== Navigation Links ========== */
.site-header .navbar-nav {
  gap: 5px;
}

.site-header .nav-item {
  position: relative;
}

.site-header .nav-link {
  color: var(--color-text);
  font-size: 0.9375rem; /* 15px */
  font-weight: 500;
  padding: 10px 18px !important;
  position: relative;
  transition: color var(--transition-fast);
}

/* Underline Animation - 使用::before避免与Bootstrap dropdown箭头冲突 */
.site-header .nav-link::before {
  content: '';
  position: absolute;
  bottom: 5px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

.site-header .nav-link:hover,
.site-header .nav-link.active {
  color: var(--color-primary);
}

.site-header .nav-link:hover::before,
.site-header .nav-link.active::before {
  transform: scaleX(1);
  transform-origin: left;
}

/* Dropdown Toggle Arrow */
.site-header .dropdown-toggle::after {
  margin-left: 6px;
  vertical-align: 2px;
  border-top-color: currentColor;
}

/* ========== Dropdown Animation ========== */
.site-header .nav-item.dropdown .dropdown-menu.dropdown-menu-animated {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-base);
  border: none;
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  padding: 8px 0;
  min-width: 180px;
  margin-top: 0;
}

.site-header .nav-item.dropdown:hover .dropdown-menu.dropdown-menu-animated {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.site-header .dropdown-item {
  padding: 10px 20px;
  font-size: 0.875rem; /* 14px */
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  position: relative;
}

.site-header .dropdown-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-primary);
  transform: scaleY(0);
  transition: transform var(--transition-fast);
}

.site-header .dropdown-item:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding-left: 25px;
}

.site-header .dropdown-item:hover::before {
  transform: scaleY(1);
}

/* ========== Search Animation ========== */
.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-toggle {
  background: none;
  border: none;
  padding: 10px;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-toggle:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.search-form {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  background: #f5f5f5;
  border-radius: 25px;
  overflow: hidden;
  width: 0;
  opacity: 0;
  transition: all var(--transition-smooth);
}

.search-wrapper.active .search-form {
  width: 280px;
  opacity: 1;
}

.search-wrapper.active .search-toggle {
  opacity: 0;
  pointer-events: none;
}

.search-form input {
  border: none;
  background: transparent;
  padding: 12px 15px;
  font-size: 0.875rem; /* 14px */
  width: 100%;
  outline: none;
}

.search-form input::placeholder {
  color: #999;
}

.search-form button {
  background: var(--color-primary);
  border: none;
  padding: 12px 15px;
  color: white;
  cursor: pointer;
  transition: background var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-form button:hover {
  background: var(--color-primary-hover);
}

/* ========== Mobile Toggle Animation ========== */
.site-header .navbar-toggler {
  border: none;
  padding: 10px;
  background: none;
}

.site-header .navbar-toggler:focus {
  box-shadow: none;
}

.toggler-icon {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
}

.toggler-icon span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* ========== Offcanvas Mobile Menu ========== */
.offcanvas {
  width: 300px;
  border-left: none;
  box-shadow: var(--shadow-md);
}

.offcanvas-header {
  padding: 20px;
  border-bottom: 1px solid #eee;
}

.offcanvas-logo img {
  height: 40px;
}

.offcanvas-body {
  padding: 20px;
}

.mobile-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-nav > li {
  border-bottom: 1px solid #f0f0f0;
}

/* Mobile Nav Item Container */
.mobile-nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-nav > li > a,
.mobile-nav-item > a {
  display: block;
  padding: 15px 0;
  color: var(--color-text);
  font-size: 1rem; /* 16px */
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
  flex: 1;
}

.mobile-nav > li > a:hover,
.mobile-nav-item > a:hover {
  color: var(--color-primary);
}

/* Submenu Toggle Button */
.submenu-toggle {
  background: none;
  border: none;
  padding: 15px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.toggle-arrow {
  display: block;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid var(--color-text-muted);
  transition: transform var(--transition-base), border-top-color var(--transition-fast);
}

.submenu-toggle:hover .toggle-arrow {
  border-top-color: var(--color-primary);
}

/* Arrow rotation when expanded */
.mobile-nav > li.submenu-open .toggle-arrow {
  transform: rotate(180deg);
}

.mobile-nav > li.submenu-open .submenu-toggle .toggle-arrow {
  border-top-color: var(--color-primary);
}

/* Submenu styles */
.mobile-nav .submenu {
  list-style: none;
  padding: 0 0 0 15px;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base), padding var(--transition-base);
}

/* Submenu expanded */
.mobile-nav > li.submenu-open .submenu {
  max-height: 500px;
  padding-bottom: 10px;
}

.mobile-nav .submenu li {
  margin: 0;
}

.mobile-nav .submenu a {
  display: block;
  padding: 10px 0;
  color: var(--color-text-muted);
  font-size: 0.875rem; /* 14px */
  text-decoration: none;
  transition: all var(--transition-fast);
}

.mobile-nav .submenu a:hover {
  color: var(--color-primary);
  padding-left: 10px;
}

.mobile-search {
  margin-top: 20px;
  display: flex;
  gap: 10px;
}

.mobile-search input {
  flex: 1;
  padding: 12px 15px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.875rem; /* 14px */
  outline: none;
  transition: border-color var(--transition-fast);
}

.mobile-search input:focus {
  border-color: var(--color-primary);
}

.mobile-search button {
  padding: 12px 20px;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 0.875rem; /* 14px */
  cursor: pointer;
  transition: background var(--transition-fast);
}

.mobile-search button:hover {
  background: var(--color-primary-hover);
}

/* ========== 自定义导航展开断点 ========== */
/* 基础状态 - 移动端(<=1024px) */
.navbar-expand-custom {
  flex-wrap: nowrap;
  justify-content: flex-start;
}

.navbar-expand-custom .navbar-collapse {
  display: none;
  flex-basis: auto;
}

.navbar-expand-custom .navbar-toggler {
  display: flex;
}

/* 桌面端(>1024px) */
@media (min-width: 1025px) {
  .navbar-expand-custom .navbar-collapse {
    display: flex !important;
  }

  .navbar-expand-custom .navbar-toggler {
    display: none !important;
  }

  .navbar-expand-custom .navbar-nav {
    flex-direction: row;
  }
}

/* ========== Responsive ========== */

/* ----- 平板竖屏 (768-1024px) ----- */
@media (min-width: 768px) and (max-width: 1024px) {
  .site-header .navbar {
    height: 70px;
  }

  .logo-img {
    height: 40px;
  }

  .offcanvas {
    width: 350px;
  }

  .offcanvas-header {
    padding: 20px 25px;
  }

  .offcanvas-body {
    padding: 25px;
  }

  .offcanvas-logo img {
    height: 38px;
  }

  .mobile-nav > li > a,
  .mobile-nav-item > a {
    font-size: 1.0625rem; /* 17px */
    padding: 16px 0;
  }

  .mobile-nav .submenu a {
    font-size: 0.9375rem; /* 15px */
    padding: 12px 0;
  }

  .mobile-search {
    margin-top: 30px;
  }

  .mobile-search input {
    padding: 14px 18px;
    font-size: 0.9375rem; /* 15px */
  }

  .mobile-search button {
    padding: 14px 24px;
    font-size: 0.9375rem; /* 15px */
  }
}

/* ----- 小屏手机 (sm: 576-767px) ----- */
@media (min-width: 576px) and (max-width: 767.98px) {
  .site-header .navbar {
    height: 60px;
  }

  .logo-img {
    height: 36px;
  }

  .offcanvas {
    width: 320px;
  }

  .offcanvas-header {
    padding: 18px 20px;
  }

  .offcanvas-body {
    padding: 20px;
  }

  .offcanvas-logo img {
    height: 36px;
  }

  .mobile-nav > li > a,
  .mobile-nav-item > a {
    font-size: 1rem; /* 16px */
    padding: 14px 0;
  }

  .mobile-nav .submenu a {
    font-size: 0.875rem; /* 14px */
    padding: 10px 0;
  }

  .mobile-search {
    margin-top: 25px;
  }

  .mobile-search input {
    padding: 12px 15px;
    font-size: 0.875rem; /* 14px */
  }

  .mobile-search button {
    padding: 12px 20px;
    font-size: 0.875rem; /* 14px */
  }
}

/* ----- 超小屏手机 (xs: <576px) ----- */
@media (max-width: 575.98px) {
  .site-header .navbar {
    height: 56px;
    padding: 0 10px;
  }

  .logo-img {
    height: 32px;
  }

  .offcanvas {
    width: 85% !important;
    max-width: 300px;
  }

  .offcanvas-header {
    padding: 15px;
  }

  .offcanvas-body {
    padding: 15px;
  }

  .offcanvas-logo img {
    height: 32px;
  }

  .mobile-nav > li > a,
  .mobile-nav-item > a {
    font-size: 0.9375rem; /* 15px */
    padding: 12px 0;
  }

  .mobile-nav .submenu {
    padding-left: 12px;
  }

  .mobile-nav .submenu a {
    font-size: 0.8125rem; /* 13px */
    padding: 8px 0;
  }

  .submenu-toggle {
    padding: 12px;
  }

  .toggle-arrow {
    border-left-width: 4px;
    border-right-width: 4px;
    border-top-width: 5px;
  }

  .mobile-search {
    margin-top: 20px;
    flex-direction: column;
  }

  .mobile-search input {
    padding: 10px 12px;
    font-size: 0.8125rem; /* 13px */
  }

  .mobile-search button {
    padding: 10px 15px;
    font-size: 0.8125rem; /* 13px */
  }
}