/* SEO 页面样式 - seo.css */
/* 顶部导航 header / CTA / 页脚 footer 为全站公共样式，统一放在 style.css */

/* ==================== 首屏 ==================== */
/* 高度 / 定位 / 字号 / 按钮等结构样式统一在公共 style.css 的 .hero 系列（内页共用同一套：
   hero 560 高、文字块 @top188、标题 48px、副标题 24px、按钮 145×48 @top356），这里只定义本页背景 */
.hero { background: #eef2fb url('../img/seo/61546285.jpg') 50% 50%/cover no-repeat; }
/* ==================== 行业难题 ==================== */
.pain {
  padding: 80px 0 35px;
  background: #f7faff url('../img/seo/61538744.jpg') 50% 50%/cover no-repeat;
}
.pain .sec-title { margin-bottom: 70px; }
.pain-cards { display: flex; gap: 40px; }
.pain-card {
  position: relative; flex: 1; border-radius: 20px;
  padding: 60px 33px 37px 47px; background-position: 50% 50%; background-size: cover;
}
.pain-card--in {
  background-image: url('../img/seo/61528826.jpg'); border: 1px solid #c6e0ff;
}
.pain-card--out {
  background-image: url('../img/seo/61530057.jpg'); border: 1px solid #dfdbff;
}
.pain-badge { position: absolute; right: -1px; top: -1px; width: 106px; height: 38px; object-fit: contain; object-position: top right; }
.pain-card h3 {
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 32px; font-weight: 700; color: #1d2129;
}
.pain-tag {
  display: block; width: 360px; height: 42px; line-height: 42px;
  margin: -2px 0 0 -20px; padding: 0 19px 0 20px;
  border-radius: 10px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 18px;
  background-repeat: no-repeat; background-position: 50% 50%; background-size: 100% 100%;
}
.pain-card--in .pain-tag { color: #317af7; background-image: url('../img/seo/61528990.jpg'); }
.pain-card--out .pain-tag { color: #8078c4; background-image: url('../img/seo/61530185.jpg'); }
.pain-list {
  display: grid; grid-template-columns: 1fr 1fr; gap: 26px 25px;
  margin-top: 17px;
}
.pain-list h4 {
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 20px; font-weight: 700;
}
.pain-card--in .pain-list h4 { color: #317af7; }
.pain-card--out .pain-list h4 { color: #8078c4; }
.pain-list p {
  margin-top: 8px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 16px; color: #636e80; line-height: 1.6;
}
.btn-pill-in, .btn-pill-out {
  margin-top: 40px; height: 52px; width: 182px; border-radius: 200px; padding: 0 12px;
  font-size: 18px; color: #fff;
}
.btn-pill-in { background: #317af7 url('../img/seo/61250273.jpg') 50% 50%/cover no-repeat; }
.btn-pill-out { background: #8078c4 url('../img/seo/61530531.jpg') 50% 50%/cover no-repeat; }
.btn-pill-in img, .btn-pill-out img { width: 24px; height: 24px; margin-left: 8px; }
.btn-pill-in:hover, .btn-pill-out:hover { opacity: .92; }

.pain-summary {
  display: flex; align-items: center; gap: 16px;
  margin-top: 30px; padding: 22px 30px;
  background: #fff; border: 1px solid #f3f3f3; border-radius: 20px;
  box-shadow: 0 5px 10px rgba(224, 235, 255, .4);
}
.pain-summary img { width: 44px; height: 44px; object-fit: contain; }
.pain-summary h4 {
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 22px; font-weight: 700; color: #1d2129; white-space: nowrap;
}
.pain-summary__line { width: 1px; height: 26px; background: #e4e8f0; flex-shrink: 0; }
.pain-summary p {
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 16px; color: #636e80; line-height: 1.6;
}

/* ==================== 四大核心服务优势 ==================== */
.advantage {
  padding: 70px 0 80px;
  background: #f7fbff url('../img/seo/61538760.jpg') 50% 50%/cover no-repeat;
}
.advantage .sec-title { margin-bottom: 44px; }
.adv-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.adv-card {
  border: 1px solid #e4e8f0; border-radius: 10px;
  background-position: 50% 100%; background-size: cover; background-repeat: no-repeat;
  padding: 30px 26px 230px;
}
.adv-card--a { background-image: url('../img/seo/61537861.jpg'); }
.adv-card--b { background-image: url('../img/seo/61538145.jpg'); }
.adv-card--c { background-image: url('../img/seo/61537997.jpg'); }
.adv-card--d { background-image: url('../img/seo/61538704.jpg'); }
.adv-card h4 {
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 24px; font-weight: 700; color: #1d2129;
}
.adv-card p {
  margin-top: 12px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 16px; color: #636e80; line-height: 1.6;
}

/* ==================== 双赛道SEO解决方案 ==================== */
.dual {
  padding: 80px 0 100px;
  background: #f5f9ff url('../img/seo/61543391.jpg') 50% 50%/cover no-repeat;
}
.dual .sec-title { margin-bottom: 70px; }
.dual-block {
  position: relative;
  border-radius: 20px; padding: 54px 35px 68px 36px;
  background-position: 50% 50%; background-size: cover;
  box-shadow: 0 5px 10px rgba(224, 235, 255, .4);
  border: 1px solid #fff;
}
.dual-block--in { background-image: url('../img/seo/61539583.jpg'); }
.dual-block--out { background-image: url('../img/seo/61543280.jpg'); margin-top: 40px; }
.dual-head { display: flex; align-items: center; gap: 14px; min-height: 68px; }
.dual-icon { width: 68px; height: 68px; object-fit: contain; }
.dual-head h3 {
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 32px; font-weight: 700; color: #1d2129; line-height: 1.5;
}
.dual-btn { margin-top: 0; margin-left: auto; height: 52px; width: 182px; padding: 0 12px; font-size: 18px; }
.dual-checks { display: flex; gap: 40px; margin-top: 15px; flex-wrap: wrap; }
.dual-checks li {
  display: flex; align-items: center; gap: 10px; min-height: 40px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 16px; color: #636e80;
}
.dual-checks img { width: 38px; height: 38px; object-fit: contain; flex-shrink: 0; }
.dual-body { margin-top: 34px; }
.dual-items {
  display: grid; grid-template-columns: repeat(2, 410px); gap: 21px 14px;
}
/* 每个条目为设计稿的白色胶囊卡（背景图 61539576.png 即 410×130 胶囊） */
.dual-item {
  min-height: 130px; padding: 25px 21px 16px 50px;
  border-radius: 200px;
  background: url('../img/seo/61539576.png') 50% 50%/cover no-repeat;
}
.dual-item__title { height: 21px; width: auto; }
.dual-item p {
  margin-top: 9px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 16px; color: #636e80; line-height: 1.6;
}
/* 3D 插图按设计稿定位（块内 x919 / y111 / 440×440） */
.dual-pic { position: absolute; top: 111px; right: 41px; width: 440px; }
.dual-pic img { width: 100%; display: block; }

/* ==================== 实战优化案例 ==================== */
.cases {
  padding: 70px 0 80px;
  background: #fff url('../img/seo/61545610.jpg') 50% 100%/cover no-repeat;
}
.cases .sec-title { margin-bottom: 36px; }
.industry-tabs { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; }
.industry-tab {
  display: flex; align-items: center; gap: 10px;
  height: 48px; padding: 0 26px; border-radius: 200px;
  background: #fff; color: #1d2129; cursor: pointer;
  font-family: Tahoma, Geneva, sans-serif;
  font-size: 18px; font-weight: 700;
  transition: background .2s, color .2s;
}
.industry-tab img { width: 26px; height: 26px; object-fit: contain; }
.industry-tab.active {
  background: #317af7 url('../img/seo/61250273.jpg') 50% 50%/cover no-repeat;
  color: #fff;
}
.case-card {
  margin-top: 30px; background: #fff; border-radius: 20px;
  border: 1px solid #eee; box-shadow: 0 5px 10px rgba(224, 235, 255, .4);
  padding: 36px 40px 40px;
}
.case-head { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.case-head h3 {
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 24px; font-weight: 700; color: #1d2129;
}
.case-head h3 em { font-style: normal; color: #317af7; }
.case-sep { color: #c6dbff; margin: 0 4px; }
.case-btn { margin-top: 0; height: 48px; font-size: 18px; }
.case-sub {
  margin-top: 12px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 16px; color: #636e80; line-height: 1.6;
}
.case-body { display: flex; align-items: center; gap: 20px; margin-top: 26px; }
.case-col {
  flex: 1; position: relative; overflow: hidden;
  border-radius: 20px; padding: 28px 30px;
}
.case-col:not(.case-col--after) {
  background: #f8f8f8 url('../img/seo/61500700.png') right 18px top 12px/auto 44% no-repeat;
  border: 2px solid #eee;
}
.case-col--after {
  background: #e7efff url('../img/seo/61512079.png') right 18px top 12px/auto 44% no-repeat;
  border: 2px solid #c6dbff;
}
.case-col h4 {
  display: flex; align-items: center; gap: 10px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 24px; font-weight: 700; color: #1d2129;
}
.case-col h4 img { width: 32px; height: 32px; object-fit: contain; }
.case-col ul { margin-top: 18px; }
.case-col li {
  position: relative; padding-left: 16px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 16px; color: #636e80; line-height: 1.8;
}
.case-col li + li { margin-top: 8px; }
.case-col li::before { content: "·"; position: absolute; left: 0; top: 0; }
.case-arrow { flex: 0 0 40px; }
.case-arrow img { width: 40px; height: 40px; object-fit: contain; }

.logo-wall { margin-top: 40px; overflow: hidden; }
.logo-row {
  display: flex; align-items: center; width: max-content; height: 92px;
  mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
}
.logo-row + .logo-row { margin-top: 12px; }
.logo-row img {
  width: 150px; height: 76px; object-fit: contain; flex-shrink: 0; margin: 0 14px;
  background: #fff; border-radius: 10px; padding: 10px;
}

/* ==================== 专业SEO诊断检测 ==================== */
/* 诊断检测：设计稿为「一条波线 + 7 张 200×220 白卡交错分布 + 波线上圆点」 */
.diagnose { position: relative; overflow: hidden; padding: 80px 0 190px; background: #f7faff; }
.diagnose .sec-title { margin-bottom: 130px; }
/* 卡片按设计稿的 1440 画布对齐（首尾卡会溢出容器边缘，由区块 overflow:hidden 裁掉） */
.diag {
  position: relative; left: 50%; transform: translateX(-50%);
  width: 1440px; height: 510px;
}
.diag-line {
  position: absolute; left: 20px; top: 200px;
  width: 1400px; height: 105px; pointer-events: none;
}
.diag-list { position: absolute; left: 0; top: 0; width: 100%; height: 100%; }
.diag-item {
  position: absolute; top: 0; width: 200px; height: 220px;
  padding: 26px 20px 0; text-align: center;
  background: #fff; border-radius: 20px;
  box-shadow: 0 10px 20px rgba(198, 224, 255, .3);
}
/* 波线上的圆点：上排卡片的点落在下方波谷，下排卡片的点落在上方波峰 */
/* 圆点：16×16 蓝芯 + 5px 白色外圈 = 26×26（与设计稿实测一致） */
.diag-item::after {
  content: ""; position: absolute; left: 50%; margin-left: -8px;
  width: 16px; height: 16px; border-radius: 50%; background: #08a2ff;
  box-shadow: 0 0 0 5px #fff;
}
.diag-item:nth-child(1) { left: -10px; }
.diag-item:nth-child(1)::after { top: 295px; }
.diag-item:nth-child(2) { left: 196px; top: 290px; }
.diag-item:nth-child(2)::after { top: -95px; }
.diag-item:nth-child(3) { left: 412px; }
.diag-item:nth-child(3)::after { top: 295px; }
.diag-item:nth-child(4) { left: 832px; }
.diag-item:nth-child(4)::after { top: 295px; }
.diag-item:nth-child(5) { left: 1247px; }
.diag-item:nth-child(5)::after { top: 295px; }
.diag-item:nth-child(6) { left: 619px; top: 290px; }
.diag-item:nth-child(6)::after { top: -95px; }
.diag-item:nth-child(7) { left: 1040px; top: 290px; }
.diag-item:nth-child(7)::after { top: -95px; }
.diag-item img { display: block; width: 61px; height: 61px; object-fit: contain; margin: 0 auto 9px; }
.diag-item h4 {
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 24px; font-weight: 700; color: #1d2129; line-height: 1.5;
}
.diag-item p {
  margin-top: 4px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 16px; color: #636e80; line-height: 1.5;
}

/* ==================== 六步闭环服务 ==================== */
.service { padding: 80px 0 96px; background: #fff; }
.service .sec-title { margin-bottom: 70px; }
/* 设计稿：6 张 233×260 卡片无缝相接（6×233≈1400），卡间夹 24×24 箭头 */
.step-list { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0; }
.step-card { position: relative; min-height: 260px; text-align: center; }
.step-card > img { display: block; width: 100px; height: 100px; object-fit: contain; margin: 0 auto; }
.step-card h4 {
  height: 34px; margin-top: 15px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 24px; font-weight: 700; color: #1d2129; line-height: 25px;
}
.step-card p {
  width: 200px; margin: 6px auto 0;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 16px; color: #636e80; line-height: 1.5625;
}
/* 步骤之间：一条 2px #eef5ff 横线贯通（设计稿位于图标圆心高度），
   线从本卡图标右缘一直画到下一张卡的图标左缘；箭头为不透明白底素材，
   叠在线上自然把线断开——与设计稿一致 */
.step-card:not(:last-child)::before {
  content: ""; position: absolute;
  left: calc(50% + 50px); right: calc(50px - 50%);
  top: 51px; height: 2px; background: #eef5ff; pointer-events: none;
}
/* 步骤之间的箭头：设计稿 24×24，跨在两卡交界处（卡内 x220..244 / y40） */
.step-card:not(:last-child)::after {
  content: ""; position: absolute; right: -11px; top: 40px;
  width: 24px; height: 24px; pointer-events: none;
  background: url('../img/seo/61546098.jpg') 50% 50%/contain no-repeat;
}

.faq-title {
  margin-top: 63px; padding-top: 9px; text-align: center;
  font-family: Tahoma, Geneva, sans-serif;
  font-size: 36px; font-weight: 700; color: #1d2129;
}
.faq-list { margin-top: 67px; display: flex; flex-direction: column; gap: 20px; }
.faq-item {
  background: #fff; border: 1px solid #f0f4fa; border-radius: 20px;
  box-shadow: 0 5px 10px rgba(224, 235, 255, .4);
  overflow: hidden;
}
.faq-q {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  position: relative;
  width: 100%; padding: 32px 27px 32px 82px; text-align: left; line-height: 1.4;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 24px; color: #1d2129; cursor: pointer;
}
/* 问题前的蓝色圆点（设计稿 10×10 #317af7，left 48） */
.faq-q::before {
  content: ""; position: absolute; left: 48px; top: 50%; transform: translateY(-50%);
  width: 10px; height: 10px; border-radius: 200px; background: #317af7;
}
.faq-q img { width: 32px; height: 32px; object-fit: contain; flex-shrink: 0; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a p:empty { display: none; }
.faq-a p {
  padding: 0 82px 26px;
  font-family: "Source Han Sans", Geneva, sans-serif;
  font-size: 18px; color: #636e80; line-height: 1.5625;
}
/* 展开时答案上移，使问答间距与设计稿一致（条目 100 → 160） */
.faq-item.open .faq-a { max-height: 300px; margin-top: -22px; }

/* ==================== 响应式适配 ==================== */
@media (max-width: 1399px) {.hero { background-position: 62% 50%; }

  .pain-card { padding: 34px 30px 32px; }
  .pain-card h3 { font-size: 27px; }
  .pain-tag { margin-left: -12px; }
  .pain-list { gap: 20px 18px; }
  .pain-list h4 { font-size: 18px; }
  .pain-list p { font-size: 15px; }

  .adv-card { padding: 26px 22px 190px; }
  .adv-card h4 { font-size: 21px; }
  .adv-card p { font-size: 15px; }

  .dual-block { padding: 34px 32px 36px; }
  .dual-head h3 { font-size: 28px; }
  .dual-icon { width: 56px; height: 56px; }
  .dual-head { min-height: 56px; }
  .dual-items { grid-template-columns: repeat(2, 1fr); }
  .dual-pic { position: static; width: 340px; max-width: 100%; margin: 26px auto 0; }

  /* 诊断区：窄屏回归常规网格，取消绝对定位、波线与圆点 */
  .diagnose { padding: 70px 0 80px; }
  .diagnose .sec-title { margin-bottom: 44px; }
  .diag { position: static; left: auto; transform: none; width: auto; height: auto; }
  .diag-line { display: none; }
  .diag-list { position: static; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
  .diag-item,
  .diag-item:nth-child(n) { position: static; left: auto; top: auto; width: auto; height: auto; min-height: 220px; padding: 26px 18px; }
  .diag-item::after { display: none; }
  .diag-item img { width: 56px; height: 56px; }
  .diag-item h4 { font-size: 20px; }
  .diag-item p { font-size: 14px; }

  .step-list { gap: 0; }
  .step-card { min-height: 0; }
  .step-card > img { width: 78px; height: 78px; }
  .step-card h4 { height: auto; font-size: 20px; line-height: 1.4; margin-top: 12px; }
  .step-card p { width: auto; padding: 0 6px; font-size: 14px; line-height: 1.6; }
  /* 卡片变窄后取消设计稿的硬换行，交给浏览器折行 */
  .step-card p br { display: none; }
  .step-card:not(:last-child)::before { left: calc(50% + 39px); right: calc(39px - 50%); top: 39px; }
  .step-card:not(:last-child)::after { right: -9px; top: 30px; width: 20px; height: 20px; }

  .faq-title { font-size: 32px; margin-top: 52px; padding-top: 8px; }
  .faq-list { margin-top: 56px; }
  .faq-q { font-size: 21px; padding: 26px 22px 26px 64px; }
  .faq-q::before { left: 36px; }
  .faq-a p { font-size: 17px; padding: 0 64px 22px; }
  .faq-item.open .faq-a { margin-top: -18px; }
}

@media (max-width: 1199px) {
  .pain-cards { gap: 16px; }
  .pain-card { padding: 28px 24px 26px; }
  .pain-card h3 { font-size: 24px; }
  .pain-list { grid-template-columns: 1fr; gap: 16px; }
  .pain-summary { padding: 18px 22px; }
  .pain-summary h4 { font-size: 19px; }
  .pain-summary p { font-size: 15px; }

  .adv-list { grid-template-columns: repeat(2, 1fr); }

  .dual-items { gap: 18px; }
  .dual-pic { width: 300px; }
  .case-col::after { font-size: 48px; }

}

@media (max-width: 991px) {.hero { background-image:
      linear-gradient(180deg, rgba(255, 255, 255, .9) 34%, rgba(255, 255, 255, .6)),
      url('../img/seo/61546285.jpg'); background-position: 50% 50%, 68% 50%; background-size: cover, cover; }

  .pain-cards { flex-direction: column; }
  .pain-tag { width: max-content; }
  .pain-summary { flex-wrap: wrap; }
  .pain-summary p { flex: 1 1 100%; }

  .dual-items { grid-template-columns: 1fr; }
  .dual-pic { width: 280px; margin: 20px auto 0; }
  .dual-head { flex-wrap: wrap; }
  .dual-btn { margin-left: 0; }

  .case-body { flex-direction: column; }
  .case-arrow { transform: rotate(90deg); margin: 0 auto; }

  .step-list { grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .step-card:not(:last-child)::before,
  .step-card:not(:last-child)::after { display: none; }

  .diag-list { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .diag-item, .diag-item:nth-child(n) { min-height: 0; padding: 24px 18px; }
}

@media (max-width: 767px) {

  .pain { padding: 44px 0 52px; }
  .pain-card { padding: 24px 18px; }
  .pain-card h3 { font-size: 21px; }
  .pain-badge { width: 86px; height: 31px; }
  .pain-tag { width: auto; max-width: 100%; height: auto; min-height: 34px; line-height: 1.4; font-size: 15px; padding: 8px 14px; margin: 0; }
  .pain-list { margin-top: 18px; gap: 14px; }
  .pain-list h4 { font-size: 16px; }
  .pain-list p { font-size: 13px; margin-top: 6px; }
  .btn-pill-in, .btn-pill-out { margin-top: 24px; height: 44px; font-size: 16px; }
  /* 摘要卡：窄屏第一行只剩「图标 + 核心症结」，原竖向分隔线没有分隔对象 →
     改画成标题右侧的渐隐延伸线，填满头部行；正文独占一行，靠间距与头部拉开层次 */
  .pain-summary { align-items: center; gap: 10px 12px; padding: 16px 18px 18px; }
  .pain-summary__line {
    flex: 1 1 0; width: auto; height: 1px;
    background: linear-gradient(90deg, #e2e9f5, rgba(226, 233, 245, 0));
  }
  .pain-summary img { width: 34px; height: 34px; }
  .pain-summary h4 { font-size: 17px; }
  .pain-summary p { margin-top: 8px; font-size: 13px; line-height: 1.7; }

  .advantage { padding: 34px 0 44px; }
  .advantage .sec-title { margin-bottom: 26px; }
  .adv-list { grid-template-columns: 1fr; gap: 16px; }
  /* 手机端单列：插画 cover 铺满卡片会压住正文 → 上半部叠一层白色渐变遮罩隔出文字区，
     下半部渐隐露出完整插画；文字提到遮罩之上。4 张卡内文行数不同，给 p 兜底行高使卡片等高 */
  .adv-card {
    position: relative; overflow: hidden;
    padding: 22px 18px 152px;
    box-shadow: 0 6px 16px rgba(31, 74, 163, .07);
  }
  .adv-card::before {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(180deg, #fff 0%, #fff 45%, rgba(255, 255, 255, .9) 58%, rgba(255, 255, 255, 0) 78%);
  }
  .adv-card h4, .adv-card p { position: relative; z-index: 1; }
  .adv-card h4 { font-size: 19px; }
  .adv-card p { font-size: 14px; min-height: 67px; }

  .dual { padding: 44px 0 52px; }
  /* 手机端标题块与下方内容：桌面档 70px 是唯一定义，窄屏从未覆盖 → 标题像被孤立悬空。
     收到 28px 与页内其余区块（.advantage 26 / .diagnose 32）同量级；副标题同步收紧，使
     h2 + 副标题读成一个整体 */
  .dual .sec-title { margin-bottom: 28px; }
  .dual .sec-title p { margin-top: 10px; }
  .dual-block { padding: 24px 18px 26px; }
  .dual-head h3 { font-size: 21px; }
  .dual-icon { width: 30px; height: 30px; }
  .dual-btn { height: 42px; font-size: 15px; }
  .dual-checks { gap: 12px; margin-top: 14px; }
  .dual-checks li { font-size: 13px; }
  .dual-checks img { width: 18px; height: 18px; }
  .dual-items { grid-template-columns: 1fr; gap: 16px; }
  .dual-item p { font-size: 13px; }

  .cases { padding: 44px 0 52px; }
  .industry-tabs { gap: 10px; }
  .industry-tab { height: 42px; padding: 0 16px; font-size: 15px; }
  .industry-tab img { width: 20px; height: 20px; }
  .case-card { padding: 24px 18px 26px; }
  .case-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .case-head h3 { font-size: 19px; }
  .case-btn { height: 42px; font-size: 15px; }
  .case-sub { font-size: 13px; }
  .case-col { padding: 20px 18px; }
  .case-col h4 { font-size: 18px; }
  .case-col h4 img { width: 26px; height: 26px; }
  .case-col li { font-size: 13px; }
  .logo-row { height: 72px; }
  .logo-row img { width: 110px; height: 58px; margin: 0 8px; padding: 8px; }

  .diagnose { padding: 44px 0 52px; }
  .diagnose .sec-title { margin-bottom: 32px; }
  .diag-list { grid-template-columns: repeat(2, 1fr); gap: 16px 12px; }
  .diag-item, .diag-item:nth-child(n) { padding: 20px 14px; }
  .diag-item img { width: 48px; height: 48px; margin-bottom: 8px; }
  .diag-item h4 { font-size: 17px; }
  .diag-item p { font-size: 13px; }

  .service { padding: 44px 0 56px; }
  .step-list { grid-template-columns: repeat(2, 1fr); gap: 22px 12px; }
  .step-card > img { width: 54px; height: 54px; }
  .step-card h4 { font-size: 16px; margin-top: 10px; }
  .step-card p { width: auto; padding: 0; font-size: 12px; margin-top: 6px; line-height: 1.6; }

  .faq-title { font-size: 22px; margin-top: 44px; padding-top: 0; }
  .faq-list { margin-top: 24px; gap: 12px; }
  .faq-q { padding: 18px 18px 18px 44px; font-size: 16px; }
  .faq-q::before { left: 22px; width: 8px; height: 8px; }
  .faq-q img { width: 20px; height: 20px; }
  .faq-a p { padding: 0 44px 18px; font-size: 14px; line-height: 1.6; }
  .faq-item.open .faq-a { margin-top: -14px; }
}

@media (max-width: 479px) {
  .pain-list { grid-template-columns: 1fr; }
  .dual .sec-title { margin-bottom: 22px; }
  .dual-btn { width: 100%; justify-content: center; }
  .adv-list { grid-template-columns: 1fr; }
  .step-list { grid-template-columns: 1fr; }
  .step-card { display: flex; align-items: center; gap: 14px; text-align: left; }
  .step-card > img { width: 46px; height: 46px; margin: 0; flex-shrink: 0; }
  .step-card h4 { margin-top: 0; }
  .step-card p { width: auto; padding: 0; }
  .diag-list { grid-template-columns: 1fr; }
  .industry-tab { padding: 0 12px; font-size: 14px; }
}