/* 公共组件样式 */

/* ========== 顶部导航栏 ========== */
.header {
  /* 统一使用 fixed，避免 sticky/fixed 来回切换导致页面抖动 */
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-300);
  z-index: 1000;
  transition: box-shadow var(--transition-base), background var(--transition-base), border-color var(--transition-base);
}

/* 首页透明导航：覆盖在轮播图上方（仅改变背景与边框样式，不再改变定位） */
.header--transparent {
  background: transparent;
  border-bottom: 1px solid transparent;
}

/* 当处于透明模式时，即便存在 scrolled 也保持透明（避免与全局滚动阴影逻辑冲突） */
.header--transparent.header--scrolled {
  background: transparent;
  border-bottom-color: transparent;
}

/* 移动端菜单打开时，在透明导航下增加半透明背景与模糊，提升可读性 */
.header--transparent.header--menu-open {
  background: rgba(0, 0, 0, 0.6);
  border-bottom-color: transparent;
  backdrop-filter: blur(6px);
}

.header--scrolled {
  box-shadow: var(--shadow-sm);
}

.navbar {
  display: flex;
  align-items: center;
  height: 80px;
  gap: var(--spacing-6);
}

.navbar__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  height: 100%;
}

.navbar__logo .logo {
  height: 60px !important;
  width: auto !important;
  display: block !important;
  max-width: none !important;
  margin: 0;
}

.navbar__menu {
  display: flex;
  gap: var(--spacing-5);
  list-style: none;
  flex: 1;
}

.nav-link {
  color: var(--color-gray-900);
  text-decoration: none;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-base);
  position: relative;
}

/* 透明导航下的白色前景色 */
.header--transparent .nav-link { color: #FFFFFF; }
.header--transparent .nav-link:hover,
.header--transparent .nav-item.active .nav-link { color: #FFFFFF; }

/* 更精致的下拉箭头（参考Apple/Xiaomi风格） */
.nav-caret {
  position: relative;
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-left: 2px;
  border-right: 2px solid var(--color-gray-500);
  border-bottom: 2px solid var(--color-gray-500);
  transform: rotate(45deg);
  transition: transform var(--transition-base), border-color var(--transition-base), opacity var(--transition-base);
  opacity: 0.9;
}

.header--transparent .nav-caret {
  border-right-color: rgba(255,255,255,0.9);
  border-bottom-color: rgba(255,255,255,0.9);
}

.nav-link:hover .nav-caret,
.nav-item.active .nav-caret {
  border-color: var(--color-primary-dark);
  opacity: 1;
}

/* 悬停展开时旋转 */
.has-dropdown:hover .nav-caret {
  transform: rotate(225deg);
}

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

/* 导航下划线动画：悬浮时自左向右出现，移开时自左向右消失 */
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--color-primary-dark);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.header--transparent .nav-link::after {
  background: #FFFFFF;
}

.nav-link:hover::after,
.nav-item.active .nav-link::after {
  transform: scaleX(1);
}

/* 下拉菜单 */
.has-dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--color-white);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-medium);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  padding: 20px;
  min-width: 280px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
}

.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-title {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
  margin-bottom: 12px;
}

.dropdown-submenu {
  list-style: none;
}

.dropdown-submenu a {
  display: block;
  padding: 8px 12px;
  color: var(--color-gray-700);
  text-decoration: none;
  border-radius: var(--radius-small);
  transition: all var(--transition-base);
}

.dropdown-submenu a:hover {
  background: var(--color-gray-100);
  color: var(--color-primary-dark);
}

.dropdown-divider {
  height: 1px;
  background: var(--color-gray-300);
  margin: 12px 0;
}

.dropdown-section {
  margin-bottom: 8px;
}

.dropdown-section:last-child {
  margin-bottom: 0;
}

.navbar__cta {
  margin-left: auto;
}

.navbar__toggle {
  display: none;
}

/* 移动端导航 */
@media (max-width: 767px) {
  .navbar {
    height: 60px;
  }
  
  .navbar__menu {
    position: fixed;
    top: 60px;
    left: -100%;
    width: 80%;
    max-width: 300px;
    height: calc(100vh - 60px);
    background: var(--color-white);
    flex-direction: column;
    padding: 20px;
    box-shadow: 2px 0 8px rgba(0,0,0,0.1);
    transition: left var(--transition-base);
    overflow-y: auto;
    gap: 0;
  }
  
  .navbar__menu.active {
    left: 0;
  }

  /* 移动端透明导航下，菜单打开时的文字依然保持白色（已由上方规则覆盖） */

  .nav-item {
    width: 100%;
    border-bottom: 1px solid var(--color-gray-300);
  }

  .nav-link {
    padding: 16px 0;
  }

  /* 移动端更大的触控空间与更柔和视觉 */
  .nav-caret {
    width: 10px;
    height: 10px;
    border-width: 2px;
  }
  
  .navbar__toggle {
    display: block;
    background: none;
    border: none;
    width: 24px;
    height: 24px;
    position: relative;
    cursor: pointer;
    margin-left: auto;
  }
  
.navbar__toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-gray-900);
    margin: 4px 0;
    transition: all var(--transition-base);
  }

.header--transparent .navbar__toggle span {
  background: #FFFFFF;
}
  
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding: 0 0 0 16px;
    margin-top: 8px;
    display: none;
  }
  
  .has-dropdown.active .dropdown-menu {
    display: block;
  }

  .navbar__cta {
    margin: 20px 0;
    width: 100%;
  }

  .navbar__cta .button {
    width: 100%;
  }
}

/* ========== 页脚 ========== */
.footer {
  background: var(--color-gray-900);
  color: #D1D5DB;
  padding: 60px 0 20px;
}

.footer-main {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid #374151;
}

.footer-title {
  color: var(--color-white);
  font-size: var(--font-size-h6);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 20px;
}

.footer-links,
.footer-contact {
  list-style: none;
}

.footer-links li,
.footer-contact li {
  margin-bottom: 12px;
}

.footer-links a,
.footer-contact a {
  color: #D1D5DB;
  text-decoration: none;
  transition: color var(--transition-base);
}

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

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  font-size: var(--font-size-small);
  color: var(--color-gray-500);
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-legal a {
  color: var(--color-gray-500);
  text-decoration: none;
}

.footer-legal span {
  color: var(--color-gray-500);
}

/* 简化版Footer样式 */
.footer-links-inline {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-links-inline a {
  color: var(--color-gray-500);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

.footer-links-inline .separator {
  color: var(--color-gray-500);
}

/* 移动端页脚 */
@media (max-width: 767px) {
  .footer-main {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .footer-legal {
    flex-wrap: wrap;
    justify-content: center;
  }

  .footer-links-inline {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* ========== 表单组件 ========== */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
  margin-bottom: 8px;
}

.required {
  color: var(--color-error);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: var(--font-size-small);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-medium);
  transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary-dark);
  box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-help {
  display: block;
  font-size: var(--font-size-tiny);
  color: var(--color-gray-500);
  margin-top: 4px;
}

.form-group--error .form-input,
.form-group--error .form-select,
.form-group--error .form-textarea {
  border-color: var(--color-error);
}

.form-error {
  display: block;
  font-size: var(--font-size-tiny);
  color: var(--color-error);
  margin-top: 4px;
}