/* =========================================================
   阿尔泰科技 · structure.css
   增值服务 > 结构设计 页面专属样式
   设计稿关键数值（1920 宽）:
     Banner      0-430 (深蓝底 + 电路板焊接图)
     Tab         430-520 (白底, 高90)
     内容区       520-2070 (浅灰底 #F1F4F9)
     Footer      2070-2775 (深灰底 #1D1D1D)
     容器         1400
   前缀: art-
   ========================================================= */

/* =========================================================
   一、Tab 导航覆盖
   ========================================================= */
.art-service-tab .art-tab_list>li { width: auto; padding: 0 60px; font-size: 22px;}
.art-service-tab .art-tab_list>li a { color: #666; text-decoration: none; display: block; position: relative; padding-bottom: 12px;}
.art-service-tab .art-tab_list>li.active a { color: #005BAC;}
.art-service-tab .art-tab_list>li.active a::after { content: ''; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%); width: 94px; height: 3px; background-color: #005BAC;}

/* =========================================================
   二、主体结构区（浅灰背景）
   ========================================================= */
.art-struct-main { background-color: #F1F4F9; padding: 40px 0 80px;}
.art-struct-layout { display: -webkit-flex; display: flex; gap: 30px;}

/* =========================================================
   三、左侧白色卡片（产品内容）
   ========================================================= */
.art-struct-content { -webkit-flex: 1; flex: 1; min-width: 0;}
.art-struct-card { background-color: #fff; border-radius: 8px; padding: 40px 48px 48px; box-shadow: 0 2px 12px rgba(0,0,0,0.04);}
.art-struct-card_title { font-size: 28px; font-weight: bold; color: #1A1A1A; margin-bottom: 20px; font-family: 'Microsoft Yahei', 'PingFang SC', sans-serif;}
.art-struct-card_desc { font-size: 15px; color: #666; line-height: 1.9; margin-bottom: 36px;}

/* 产品网格 - 3列 */
.art-struct-products { display: -webkit-flex; display: flex; -webkit-flex-wrap: wrap; flex-wrap: wrap; gap: 20px;}
.art-struct-product_item { width: calc(33.333% - 14px); background-color: #F8F9FB; border-radius: 6px; padding: 25px 20px 24px; text-align: center; -webkit-transition: all .3s; transition: all .3s; -webkit-box-sizing: border-box; box-sizing: border-box;}
.art-struct-product_item:hover { background-color: #fff; box-shadow: 0 4px 16px rgba(0,91,172,0.12); -webkit-transform: translateY(-4px); transform: translateY(-4px);}
.art-struct-product_name { font-size: 16px; color: #333; font-weight: 500; line-height: 1.4; margin-bottom: 0; position: relative; padding-bottom: 17px;}
.art-struct-product_name::after { content: ''; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%); width: 28px; height: 2px; background-color: #999;}
.art-struct-product_img { width: 100%; height: 115px; display: -webkit-flex; display: flex; -webkit-align-items: center; align-items: center; -webkit-justify-content: center; justify-content: center; margin-top: 34px; overflow: hidden;}
.art-struct-product_img img { max-width: 75%; max-height: 100%; object-fit: contain; display: block;}

/* =========================================================
   四、右侧边栏（联系卡片）
   ========================================================= */
.art-struct-sidebar { width: 340px; -webkit-flex: 0 0 340px; flex: 0 0 340px; display: -webkit-flex; display: flex; -webkit-flex-direction: column; flex-direction: column; gap: 24px;}

/* 蓝色卡片通用 */
.art-struct-sidecard { border-radius: 8px; padding: 40px 32px; text-align: center; color: #fff;}
.art-struct-sidecard-tel { background: linear-gradient(160deg, #005BAC 0%, #004A8C 100%);}
.art-struct-sidecard-qr { background: linear-gradient(180deg, #4A9FD8 0%, #2E8BC0 100%);}

/* 图标 */
.art-struct-sidecard_icon { width: 64px; height: 64px; margin: 0 auto 20px; display: -webkit-flex; display: flex; -webkit-align-items: center; align-items: center; -webkit-justify-content: center; justify-content: center;}
.art-struct-sidecard_icon svg { width: 48px; height: 48px; fill: rgba(255,255,255,0.9);}

/* 电话卡片 */
.art-struct-sidecard_num { font-size: 32px; font-weight: bold; margin-bottom: 8px; letter-spacing: 1px;}
.art-struct-sidecard_label { font-size: 15px; color: rgba(255,255,255,0.8); margin-bottom: 28px;}
.art-struct-sidecard_btn { display: inline-flex; -webkit-align-items: center; align-items: center; gap: 8px; padding: 12px 32px; border: 1px solid rgba(255,255,255,0.5); border-radius: 24px; color: #fff; font-size: 15px; text-decoration: none; -webkit-transition: all .3s; transition: all .3s;}
.art-struct-sidecard_btn:hover { background-color: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.8);}
.art-struct-sidecard_btn svg { width: 14px; height: 14px; fill: #fff;}

/* 在线客服卡片 */
.art-struct-sidecard_title { font-size: 26px; font-weight: bold; margin-bottom: 14px; color: #fff;}
.art-struct-sidecard_link { display: inline-block; font-size: 15px; color: #fff; text-decoration: underline; margin-bottom: 18px; -webkit-transition: opacity .3s; transition: opacity .3s;}
.art-struct-sidecard_link:hover { opacity: 0.85;}
.art-struct-sidecard_tip { font-size: 13px; color: rgba(255,255,255,0.7); margin-bottom: 24px;}
.art-struct-sidecard_qr { width: 148px; height: 148px; margin: 0 auto; background-color: #fff; border-radius: 6px; padding: 10px; -webkit-box-sizing: border-box; box-sizing: border-box;}
.art-struct-sidecard_qr img { width: 100%; height: 100%; object-fit: contain; display: block;}

/* =========================================================
   五、Logo 高清版 + 双 logo 切换（复用）
   ========================================================= */
.art-header-logo img { width: auto; height: 50px;}
.art-header-logo_white { display: none;}
.art-header-logo_dark { display: block;}
.art-header-trans .art-header-logo_dark { display: none;}
.art-header-trans .art-header-logo_white { display: block;}
.art-header-trans.fxd .art-header-logo_dark { display: block;}
.art-header-trans.fxd .art-header-logo_white { display: none;}
.art-footer_logo img { display: block; width: auto; height: 50px;}

/* =========================================================
   六、响应式
   ========================================================= */
@media (max-width:1680px) {
  .art-struct-card { padding: 32px 36px 40px;}
  .art-struct-card_title { font-size: 26px;}
  .art-struct-sidebar { width: 320px; -webkit-flex-basis: 320px; flex-basis: 320px;}
}
@media (max-width:1440px) {
  .art-struct-card { padding: 28px 30px 36px;}
  .art-struct-card_title { font-size: 24px;}
  .art-struct-sidebar { width: 300px; -webkit-flex-basis: 300px; flex-basis: 300px;}
  .art-struct-sidecard { padding: 32px 24px;}
  .art-struct-sidecard_num { font-size: 28px;}
}
@media (max-width:1280px) {
  .art-struct-layout { -webkit-flex-direction: column; flex-direction: column;}
  .art-struct-sidebar { width: 100%; -webkit-flex-basis: 100%; flex-basis: 100%; -webkit-flex-direction: row; flex-direction: row;}
  .art-struct-sidecard { -webkit-flex: 1; flex: 1;}
}
@media (max-width:1080px) {
  .art-struct-products { gap: 16px;}
  .art-struct-product_item { width: calc(50% - 8px);}
  .art-struct-card { padding: 24px;}
  .art-service-tab .art-tab_list>li { padding: 0 30px; font-size: 18px;}
}
@media (max-width:767px) {
  .art-struct-main { padding: 24px 0 48px;}
  .art-struct-card { padding: 20px 16px 24px;}
  .art-struct-card_title { font-size: 20px;}
  .art-struct-card_desc { font-size: 14px;}
  .art-struct-products { gap: 12px;}
  .art-struct-product_item { width: 100%; padding: 16px;}
  .art-struct-sidebar { -webkit-flex-direction: column; flex-direction: column;}
  .art-service-tab .art-tab_list>li { padding: 0 16px; font-size: 15px;}
  .art-service-tab .art-tab_list>li.active a::after { width: 60px;}
}