@media screen and (max-width: 1920px) {
    html, body {
      font-size: 20px;
    }
  }
  
  @media screen and (max-width: 1872px) {
    html, body {
      font-size: 19.5px;
    }
  }
  
  @media screen and (max-width: 1824px) {
    html, body {
      font-size: 19px;
    }
  }
  
  @media screen and (max-width: 1776px) {
    html, body {
      font-size: 18.5px;
    }
  }
  
  @media screen and (max-width: 1728px) {
    html, body {
      font-size: 18px;
    }
  }
  
  @media screen and (max-width: 1680px) {
    html, body {
      font-size: 17.5px;
    }
  }
  
  @media screen and (max-width: 1632px) {
    html, body {
      font-size: 17px;
    }
  }
  
  @media screen and (max-width: 1584px) {
    html, body {
      font-size: 16.5px;
    }
  }
  
  @media screen and (max-width: 1536px) {
    html, body {
      font-size: 16px;
    }
  }
  
  @media screen and (max-width: 1488px) {
    html, body {
      font-size: 15.5px;
    }
  }
  
  @media screen and (max-width: 1440px) {
    html, body {
      font-size: 15px;
    }
  }
  
  @media screen and (max-width: 1395px) {
    html, body {
      font-size: 14.5px;
    }
  }
  
  @media screen and (max-width: 1344px) {
    html, body {
      font-size: 14px;
    }
  }
  
  @media screen and (max-width: 1296px) {
    html, body {
      font-size: 13.5px;
    }
  }
  
  @media screen and (max-width: 1248px) {
    html, body {
      font-size: 13px;
    }
  }
  
  main .public_tit {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 2.4rem;
    margin: 0 auto;
  }
  
  main .public_tit .tit_bj_iner {
    width: 100%;
    font-size: 9.58em;
    font-family: Source Han Sans CN, Source Han Sans CN-Bold;
    font-weight: 700;
    text-align: center;
    color: #000000;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    margin-bottom: .68em;
    position: relative;
  }
  
  main .public_tit .tit_bj_iner span {
    color: #365BC9;
  }
  
  main .public_tit .fz_strip {
    width: 1.72em;
    height: .125em;
    background: #ffffff;
    background-image: url(../images/tit_xhx01.png);
    background-size: 100%;
    background-position: center;
    background-repeat: no-repeat;
    margin: auto;
    position: relative;
    overflow: hidden;
  }
  
  main .public_tit .tit_inner {
    width: 89.63%;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: .759em;
  }
  
  main .public_tit .tit_inner .tit_left {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
  }
  
  main .public_tit .tit_inner .tit_left div {
    width: 62.34%;
    opacity: 0.93;
    font-size: .416em;
    font-family: Source Han Sans SC, Source Han Sans SC-Normal;
    font-weight: normal;
    text-align: center;
    color: #000000;
    line-height: 1.5em;
    letter-spacing: 2px;
  }
  
  main .banners {
    margin-top: -1px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    background-image: url(../images/case/case_banner_img01.jpg);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    font-size: 1.4rem;
  }
  
  main .banners section {
    width: 76.66%;
    margin: 3.58em 0 14.87em 18.28%;
    display: none;
    align-items: flex-end;
    justify-content: space-between;
  }
  
  main .banners section .inn p {
    font-size: 4.28em;
    font-family: DINCondensedC, DINCondensedC-Regular;
    font-weight: 400;
    text-align: left;
    color: #ffffff;
    text-shadow: 0 2px 10px rgba(0, 10, 40, .55), 0 1px 3px rgba(0, 8, 30, .45);
  }
  
  main .banners section .inn span {
    font-size: 1.85em;
    font-family: Source Han Sans SC, Source Han Sans SC-Bold;
    font-weight: 700;
    text-align: left;
    color: #ffffff;
  }
  
  main .banners section a {
    display: flex;
    align-items: center;
  }
  
  main .banners section a span {
    font-size: 1em;
    font-family: DINCondensedC, DINCondensedC-Regular;
    font-weight: 400;
    text-align: left;
    color: #ffffff;
  }
  
  main .banners section a div {
    width: .78em;
    height: 1.5em;
    background-image: url(../images/right_img01-2.png);
    background-size: 100%;
    background-position: center;
    background-repeat: no-repeat;
    margin-left: .87em;
  }
  
  main .case_box {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    font-size: 1rem;
    width: 89.33%;
    margin: -15.65em auto auto auto;
    position: relative;
  }
  
  main .case_box .case_nav {
    width: 12.6%;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  main .case_box .case_nav .case_phpne {
    width: 100%;
    height: 6.85em;
    background: #38be86;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
  
  main .case_box .case_nav .case_phpne p {
    font-size: 1.8em;
    font-family: DINCondensedC, DINCondensedC-Regular;
    font-weight: 400;
    text-align: left;
    color: #ffffff;
    margin-bottom: .175em;
  }
  
  main .case_box .case_nav .case_phpne span {
    font-size: 1em;
    font-family: Source Han Sans SC, Source Han Sans SC-Bold;
    font-weight: 700;
    text-align: left;
    color: #ffffff;
  }
  
  main .case_box .case_nav .case_header {
    width: 100%;
    background: #ffffff;
    padding-top: 1.42em;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0px 3px 6px 0px rgba(0, 0, 0, 0.16);
  }
  
  main .case_box .case_nav .case_header ul {
    width: 67.77%;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding-bottom: 18.97em;
  }
  
  main .case_box .case_nav .case_header ul div {
    position: absolute;
    bottom: 0;
    right: 0;
    left: 0;
    margin: auto;
    width: 6.85em;
    height: 6.85em;
  }
  
  main .case_box .case_nav .case_header ul div img {
    width: 100%;
  }
  
  main .case_box .case_nav .case_header ul li {
    width: 100%;
    margin-top: .85em;
    padding-bottom: .35em;
    border-bottom: 1px solid rgba(56, 190, 134, 0);
  }
  
  main .case_box .case_nav .case_header ul li:hover {
    cursor: pointer;
    border-bottom: 1px solid #38be86;
  }
  
  main .case_box .case_nav .case_header ul li:hover a {
    opacity: 1;
  }
  
  main .case_box .case_nav .case_header ul li a {
    width: 100%;
    opacity: 0.51;
    font-size: 1em;
    font-family: Source Han Sans SC, Source Han Sans SC-Bold;
    font-weight: 700;
    text-align: left;
    color: #000000;
  }
  
  main .case_box .case_nav .case_header ul li.active {
    border-bottom: 1px solid #38be86;
  }
  
  main .case_box .case_nav .case_header ul li.active a {
    opacity: 1;
  }
  
  main .case_box .info_inner {
    width: 85.53%;
    display: none;
    flex-direction: column;
    background: #ffffff;
    font-size: 1.1rem;
    padding-top: 2.34em;
  }
  
  main .case_box .info_inner .tit {
    width: 90.21%;
    margin-left: 3.66%;
  }
  
  /* 第 69 轮：原 <p> 是空标签，标题层级缺失，改为 <h2> 后需要同款样式。
     浏览器默认 margin-top 会把区块撑开，显式清零。 */
  main .case_box .info_inner .tit h2 {
    font-size: 1.727em;
    font-family: Source Han Sans SC, Source Han Sans SC-Bold;
    font-weight: 700;
    text-align: left;
    color: #000000;
    margin: 0 0 1.59rem;
  }
  main .case_box .info_inner .tit p {
    font-size: 1.727em;
    font-family: Source Han Sans SC, Source Han Sans SC-Bold;
    font-weight: 700;
    text-align: left;
    color: #000000;
    margin-bottom: 1.59rem;
  }
  
  main .case_box .info_inner .tit .gdt {
    width: 4.7%;
    height: .27em;
    background: #38be86;
    position: relative;
    margin-bottom: 2.25em;
  }
  
  main .case_box .info_inner .introduction {
    width: 90.21%;
    margin-left: 3.66%;
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
  }
  
  main .case_box .info_inner .introduction li {
    font-size: .9em;
    font-family: Source Han Sans SC, Source Han Sans SC-Normal;
    font-weight: normal;
    text-align: left;
    color: #666666;
    line-height: 1.36em;
    margin-bottom: 1.95em;
  }
  
  main .case_box .info_inner .introduction li:last-child {
    width: 100%;
  }
  
  main .case_box .info_inner .info_tool {
    width: 90.21%;
    margin-left: 3.66%;
    display: flex;
    align-items: center;
  }
  
  main .case_box .info_inner .info_tool .info_btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 10.68em;
    height: 3.27em;
    background: linear-gradient(135deg, #6188ee, #4271ee);
    box-shadow: 0px 3px 10px 0px rgba(56, 93, 190, 0.4);
    margin-right: 1.72em;
  }
  
  main .case_box .info_inner .info_tool .info_btn span {
    width: 1.307em;
    height: 1.307em;
    margin-right: .77em;
    background-image: url(../images/kefu_img01.png);
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
  }
  
  main .case_box .info_inner .info_tool .info_btn p {
    font-size: 1.18em;
    font-family: Source Han Sans CN, Source Han Sans CN-Normal;
    font-weight: normal;
    text-align: left;
    color: #ffffff;
    line-height: 1.45em;
  }
  
  main .case_box .info_inner .info_tool .info_phone {
    display: flex;
    align-items: center;
  }
  
  main .case_box .info_inner .info_tool .info_phone div {
    width: 2.77em;
    height: 2.77em;
    background-image: url(../images/phone_img03.png);
    background-size: 100%;
    background-position: center;
    background-repeat: no-repeat;
    margin-right: 1.09em;
  }
  
  main .case_box .info_inner .info_tool .info_phone span {
    font-size: 1.18em;
    font-family: Source Han Sans SC, Source Han Sans SC-Regular;
    font-weight: 400;
    text-align: center;
    color: #6f7587;
    line-height: .9em;
    margin-right: 1.18em;
  }
  
  main .case_box .info_inner .info_tool .info_phone p {
    opacity: 0.9;
    font-size: 1.72em;
    font-family: Source Han Sans CN, Source Han Sans CN-Bold;
    font-weight: 700;
    text-align: center;
    color: #000000;
    line-height: .9em;
  }
  
  main .case_box .info_inner .case_loops {
    font-size: 1.1rem;
    width: 100%;
    margin-top: 2.95em;
  }
  
  main .case_box .info_inner .case_loops .swiper {
    width: 100%;
    margin: 0;
  }
  
  main .case_box .info_inner .case_loops .swiper .swiper-wrapper .swiper-slide:hover {
    cursor: pointer;
  }
  
  main .case_box .info_inner .case_loops .swiper .swiper-wrapper .swiper-slide img {
    width: 100%;
    height: 100%;
    display: block;
  }
  
  main .case_box .info_inner .case_loops .swiper .page {
    position: absolute;
    top: auto;
    left: auto;
    right: 0;
    bottom: -2px;
    display: flex;
  }
  
  main .case_box .info_inner .case_loops .swiper .page .swiper-button-prev,
  main .case_box .info_inner .case_loops .swiper .page .swiper-button-next {
    position: static;
    width: 2.63em;
    height: 2.63em;
    background-color: #979797;
    background-image: url(../images/right_img01-2.png);
    background-size: 27%;
    background-position: center;
    background-repeat: no-repeat;
    margin: 0;
  }
  
  main .case_box .info_inner .case_loops .swiper .page .swiper-button-prev::after,
  main .case_box .info_inner .case_loops .swiper .page .swiper-button-next::after {
    content: "";
  }
  
  main .case_box .info_inner .case_loops .swiper .page .swiper-button-prev:hover,
  main .case_box .info_inner .case_loops .swiper .page .swiper-button-next:hover {
    background-color: #38be86;
  }
  
  main .case_box .info_inner .case_loops .swiper .page .swiper-button-prev {
    transform: rotate(180deg);
  }
  
  main .recommend {
    width: 86.3%;
    font-size: 1.4rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 4.571em;
    padding-bottom: 5.89em;
    background: #f6f8fb;
    margin: 6.39em 0 4.96em 13.69%;
    position: relative;
  }
  
  main .recommend::after {
    content: "";
    position: absolute;
    left: -9.39em;
    top: -1.9em;
    width: 10.53em;
    height: 29.57em;
    background: #4271ee;
  }
  
  main .recommend .public_tit {
    width: 94.68%;
    align-items: flex-start;
    margin: 0;
    margin-left: 5.3%;
  }
  
  main .recommend .public_tit .tit_bj_iner {
    width: auto;
    font-size: 1em;
    margin: 0;
  }
  
  main .recommend .public_tit .fz_strip {
    width: 1.72em;
    height: .125em;
    background: #ffffff;
    background-image: url(../images/tit_xhx01.png);
    display: none;
  }
  
  main .recommend .swiper {
    width: 94.68%;
    margin-top: 3.39em;
    margin-left: 5.3%;
  }
  
  main .recommend .swiper .swiper-wrapper .swiper-slide {
    width: 32.56%;
    margin-right: 1.9%;
  }
  
  main .recommend .swiper .swiper-wrapper .swiper-slide:hover {
    cursor: pointer;
  }
  
  main .recommend .swiper .swiper-wrapper .swiper-slide:hover a div img {
    transform: scale(1.06);
  }
  
  main .recommend .swiper .swiper-wrapper .swiper-slide a {
    width: 100%;
    display: flex;
    flex-direction: column;
  }
  
  main .recommend .swiper .swiper-wrapper .swiper-slide a div {
    width: 100%;
    height: 10.5em;
    overflow: hidden;
  }
  
  main .recommend .swiper .swiper-wrapper .swiper-slide a div img {
    width: 100%;
    transition-duration: 1s;
  }
  
  main .recommend .swiper .swiper-wrapper .swiper-slide a span {
    width: 100%;
    height: 3.21em;
    font-size: 1em;
    font-family: Source Han Sans CN, Source Han Sans CN-Bold;
    font-weight: 700;
    text-align: left;
    color: #000000;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #ffffff;
  }
  
  main .recommend .page {
    position: absolute;
    left: 0;
    bottom: 0px;
    display: flex;
  }
  
  main .recommend .page .swiper-button-prev,
  main .recommend .page .swiper-button-next {
    position: static;
    width: 2.5em;
    height: 2.5em;
    background-color: #979797;
    background-image: url(../images/right_img01-2.png);
    background-size: 27%;
    background-position: center;
    background-repeat: no-repeat;
    margin: 0;
  }
  
  main .recommend .page .swiper-button-prev::after,
  main .recommend .page .swiper-button-next::after {
    content: "";
  }
  
  main .recommend .page .swiper-button-prev:hover,
  main .recommend .page .swiper-button-next:hover {
    background-color: #38be86;
  }
  
  main .recommend .page .swiper-button-prev {
    transform: rotate(180deg);
  }

/* ══════════════════════════════════════════════════════════════
   第 84 轮：案例详情页正文语义分块（H3 + 段落 + 项目档案）
   背景：体检报告 [P1] 指出 305-308 每页 1300 字只有 1 个 H2，
         AI 无法分块摘引。改为「客户背景 / 现场问题 / 验证 / 结果 /
         评价 / 项目档案」6 个 H3 块，每块 40-120 字。
   ══════════════════════════════════════════════════════════════ */
main .case_box .info_inner .introduction li > h3 {
  position: relative;
  margin: 0 0 .62em;
  padding-left: .78em;
  /* 字号跟随 li 的 1em（本站 li 字号随视口变，见 base_fs 实测：
     1920→19.8px / 1366→14.36px / 390→11.14px）。写死 px 会在某档撞车。 */
  font-size: 1.12em;
  font-weight: 700;
  line-height: 1.5;
  color: #0b2a55;
  letter-spacing: .01em;
}

main .case_box .info_inner .introduction li > h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: .38em;
  width: .22em;
  height: .92em;
  border-radius: .11em;
  background: #38be86;
}

main .case_box .info_inner .introduction li > p {
  margin: 0;
  font-size: 1em;
  line-height: 1.75;
  color: #5A6678;
  text-align: justify;
}

/* 客户评价：单独成块，左侧竖线 + 浅底，与正文区分 */
main .case_box .info_inner .introduction li > p.case_quote {
  margin-top: .1em;
  padding: .78em 1.05em;
  background: #F4F8FD;
  border-left: .2em solid #38be86;
  border-radius: 0 .35em .35em 0;
  font-size: 1.02em;
  line-height: 1.7;
  color: #33415C;
}

/* 项目档案：参数清单，两列在宽屏，一列在窄屏 */
main .case_box .info_inner .introduction .case_facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .5em 1.8em;
  margin: .2em 0 0;
  padding: 0;
  list-style: none;
}

main .case_box .info_inner .introduction .case_facts li {
  position: relative;
  margin: 0;
  padding: .42em 0 .42em .95em;
  font-size: .98em;
  line-height: 1.6;
  color: #5A6678;
  border-bottom: 1px dashed #E3E9F2;
}

main .case_box .info_inner .introduction .case_facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05em;
  width: .3em;
  height: .3em;
  border-radius: 50%;
  background: #B9C6D8;
}

main .case_box .info_inner .introduction .case_facts li strong {
  display: inline-block;
  min-width: 7.2em;
  margin-right: .55em;
  font-weight: 700;
  color: #0b2a55;
}

@media screen and (max-width: 750px) {
  main .case_box .info_inner .introduction .case_facts {
    grid-template-columns: 1fr;
    gap: .15em;
  }
  main .case_box .info_inner .introduction .case_facts li strong {
    display: block;
    min-width: 0;
    margin: 0 0 .1em;
  }
  /* 手机端原正文只有 11px（li .9em × 12.4px 基准），读到一半会眼睛累。
     抬到 1.28em ≈ 14.3px，与首页正文同级。 */
  main .case_box .info_inner .introduction li > h3 { font-size: 1.38em; }
  main .case_box .info_inner .introduction li > p { font-size: 1.28em; }
  main .case_box .info_inner .introduction .case_facts li { font-size: 1.2em; }
  main .case_box .info_inner .introduction li > p.case_quote { font-size: 1.22em; }
}