/* ============================================================
   线路监测网 SafeLineCenter - 网络/电气线路检测主题模板
   风格: b.speedtest 白底科技风 / 主蓝 #067cfa / 卡片 #f6f7fa / 页脚 #141525
   ============================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: #333;
    background: #fff;
    overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: all .3s; }
ul, li { list-style: none; }
.container { width: 92%; max-width: 1200px; margin: 0 auto; }

/* ---------- 顶部导航 ---------- */
.header {
    position: sticky; top: 0; z-index: 999;
    background: #fff; height: 68px;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 4%;
    box-shadow: 0 1px 0 rgba(0,0,0,.08), 0 6px 14px rgba(0,0,0,.05);
}
.logo { display: flex; align-items: center; }
.logo .mark {
    width: 40px; height: 40px; border-radius: 50%;
    background: linear-gradient(135deg, #067cfa, #00d2fa);
    color: #fff; font-weight: 800; font-size: 18px;
    display: flex; align-items: center; justify-content: center;
}
.logo .name { margin-left: 10px; }
.logo .name b { display: block; font-size: 18px; color: #333; letter-spacing: 1px; }
.logo .name span { display: block; font-size: 10px; color: #999; letter-spacing: 1.5px; text-transform: uppercase; }
.nav { display: flex; align-items: center; }
.nav a {
    font-size: 14px; color: #333; margin-left: 30px; padding: 6px 0;
    position: relative; font-weight: 500;
}
.nav a::after {
    content: ""; position: absolute; left: 50%; bottom: -2px;
    width: 0; height: 3px; background: #067cfa; transition: all .3s;
}
.nav a:hover, .nav a.on { color: #067cfa; }
.nav a:hover::after, .nav a.on::after { left: 0; width: 100%; }
.header .cta {
    margin-left: 34px; padding: 8px 18px; border-radius: 18px;
    background: #067cfa; color: #fff; font-size: 14px; font-weight: 500; white-space: nowrap;
}
.header .cta:hover { background: #0568d2; }
.nav-toggle { display: none; cursor: pointer; width: 26px; }
.nav-toggle span { display: block; height: 2px; background: #067cfa; margin: 6px 0; border-radius: 2px; transition: all .3s; }

/* ---------- Banner ---------- */
.banner { position: relative; background: #f5f5f5; box-shadow: 0 1px 0 rgba(0,0,0,.1); }
.banner .swiper { width: 100%; }
.banner .slide-img img { width: 100%; min-height: 280px; object-fit: cover; }
.banner .slide-flex {
    display: flex; align-items: center; justify-content: center; gap: 50px;
    padding: 70px 6% 90px; min-height: 460px;
}
.banner .slide-flex ._left { max-width: 640px; }
.banner .slide-flex ._left .tip {
    background: linear-gradient(90deg, #ff6858 0, #fe3f43 100%);
    border-radius: 4px; padding: 5px 10px; font-weight: 500;
    font-size: 14px; color: #fff; display: inline-block; margin-bottom: 16px;
}
.banner .slide-flex ._left h2 { font-size: 34px; font-weight: 500; color: #333; line-height: 1.5; }
.banner .slide-flex ._left p { font-size: 17px; color: #666; line-height: 1.9; margin-top: 22px; }
.banner .slide-flex ._right img { width: 420px; }
.banner .swiper-pagination { bottom: 18px !important; }
.banner .swiper-pagination-bullet { width: 8px; height: 8px; background: #4e5169; opacity: 1; }
.banner .swiper-pagination-bullet-active { background: #067cfa; width: 24px; border-radius: 4px; }

/* ---------- 通用标题 ---------- */
.sec-title {
    font-size: 32px; font-weight: 400; color: #333; text-align: center;
    padding-top: 84px; line-height: 1.4;
}
.sec-sub {
    font-size: 15px; color: #666; text-align: center;
    padding: 16px 0 36px; line-height: 1.8; max-width: 900px; margin: 0 auto;
}

/* ---------- 四大优势 ---------- */
.adv { background: #fff; padding-bottom: 80px; }
.adv .grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.adv .card {
    background: #f6f7fa; border-radius: 4px; padding: 28px 24px;
    box-shadow: 2px 2px 6px 0 rgba(0,0,0,.08); transition: all .35s; cursor: default;
}
.adv .card:hover { transform: translateY(-6px); box-shadow: 0 12px 28px rgba(6,124,250,.15); }
.adv .card .no {
    width: 44px; height: 44px; border-radius: 50%; margin-bottom: 18px;
    background: rgba(6,124,250,.1); color: #067cfa;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; font-weight: 800; font-family: Georgia, serif;
}
.adv .card h3 { font-size: 18px; color: #333; font-weight: 500; margin-bottom: 12px; }
.adv .card p { font-size: 14px; color: #666; line-height: 1.9; }

/* ---------- 检测项目 ---------- */
.testing { background: #f5f5f5; padding-bottom: 84px; }
.testing .wrap { display: flex; gap: 44px; align-items: stretch; }
.testing .pic {
    flex: 1; border-radius: 4px; overflow: hidden; min-height: 420px;
    background: #ddd; position: relative;
}
.testing .pic img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.testing .items { flex: 1.15; }
.testing .items dl { counter-reset: item; }
.testing .items dt {
    background: #fff; border-radius: 4px; margin-bottom: 10px;
    padding: 13px 18px; font-size: 14.5px; color: #333; line-height: 1.6;
    display: flex; align-items: baseline;
    box-shadow: 2px 2px 6px 0 rgba(0,0,0,.06); transition: all .3s; cursor: default;
}
.testing .items dt::before {
    counter-increment: item; content: counter(item, decimal-leading-zero);
    flex-shrink: 0; color: #067cfa; font-weight: 800; font-family: Georgia, serif;
    margin-right: 14px; font-size: 15px;
}
.testing .items dt:hover { transform: translateX(6px); box-shadow: 0 8px 20px rgba(6,124,250,.14); color: #067cfa; }

/* ---------- 产品线 ---------- */
.products { background: #fff; padding-bottom: 60px; }
.products .lines { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.products .line {
    background: #f6f7fa; border-radius: 4px; padding: 32px 28px;
    box-shadow: 2px 2px 6px 0 rgba(0,0,0,.08); transition: all .35s;
    display: flex; flex-direction: column;
}
.products .line:hover { transform: translateY(-6px); box-shadow: 0 14px 30px rgba(6,124,250,.14); }
.products .line h3 {
    font-size: 20px; color: #333; font-weight: 500; margin-bottom: 6px;
    display: flex; align-items: center;
}
.products .line h3::before {
    content: ""; width: 8px; height: 22px; border-radius: 3px;
    background: linear-gradient(180deg, #067cfa, #00d2fa); margin-right: 12px;
}
.products .line .en { font-size: 12px; color: #999; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 18px; }
.products .line p { font-size: 14px; color: #666; line-height: 1.95; flex: 1; }
.products .line .chips { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 8px; }
.products .line .chips span {
    font-size: 12.5px; color: #067cfa; background: rgba(6,124,250,.08);
    border: 1px solid rgba(6,124,250,.25); border-radius: 14px; padding: 4px 12px;
}
.platforms { display: flex; justify-content: center; gap: 70px; padding: 36px 0 20px; flex-wrap: wrap; }
.platforms .p-item { text-align: center; }
.platforms .p-item img { width: 72px; height: 72px; margin: 0 auto 10px; }
.platforms .p-item span { font-size: 14px; color: #333; }

/* ---------- SDK ---------- */
.sdk { background: #f5f5f5; padding-bottom: 84px; }
.sdk .grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.sdk .card {
    background: #fff; border-radius: 4px; padding: 22px 20px;
    box-shadow: 2px 2px 6px 0 rgba(0,0,0,.07); transition: all .3s; cursor: default;
}
.sdk .card:hover { box-shadow: 0 10px 26px rgba(6,124,250,.14); transform: translateY(-4px); }
.sdk .card h3 { font-size: 18px; font-weight: 400; color: #333; display: flex; align-items: center; margin-bottom: 8px; }
.sdk .card h3 img { width: 30px; height: 30px; margin-right: 10px; }
.sdk .card p { font-size: 14px; color: #666; line-height: 1.8; }

/* ---------- 解决方案 ---------- */
.solutions { background: #fff; padding-bottom: 70px; }
.solutions .grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.solutions .card {
    background: #f6f7fa; border-radius: 4px; padding: 20px; position: relative;
    transition: all .3s; cursor: default; overflow: hidden;
}
.solutions .card:hover { box-shadow: 2px 6px 18px 0 rgba(6,124,250,.14); transform: translateY(-4px); }
.solutions .card .t { display: flex; align-items: center; margin-bottom: 8px; }
.solutions .card .t img { width: 30px; height: 30px; margin-right: 11px; }
.solutions .card .t h3 { font-size: 17px; font-weight: 400; color: #333; }
.solutions .card p { font-size: 13.5px; color: #666; line-height: 1.8; }
.solutions .card .red-tip {
    position: absolute; top: 0; right: 0;
    background: linear-gradient(90deg, #ff6858 0, #fe3f43 100%);
    border-radius: 4px; padding: 4px 6px; font-weight: 500; font-size: 12px; color: #fff;
}

/* ---------- 定制开发 / 数据服务 / 业务咨询 ---------- */
.iconrow { background: #f5f5f5; padding-bottom: 84px; }
.iconrow.white { background: #fff; }
.iconrow .row { display: flex; justify-content: center; gap: 80px; flex-wrap: wrap; }
.iconrow .item { text-align: center; max-width: 150px; }
.iconrow .item img { width: 80px; height: 80px; margin: 0 auto 12px; }
.iconrow .item .intr { font-size: 14px; color: #666; line-height: 1.6; }

/* ---------- 关于我们 ---------- */
.about { background: #fff; padding-bottom: 84px; }
.about .wrap { display: flex; gap: 46px; align-items: center; }
.about .pic { flex: 1; border-radius: 4px; overflow: hidden; box-shadow: 2px 2px 14px rgba(0,0,0,.12); }
.about .pic img { width: 100%; transition: transform .5s; }
.about .pic:hover img { transform: scale(1.04); }
.about .txt { flex: 1.25; }
.about .txt h3 { font-size: 24px; color: #333; font-weight: 500; margin-bottom: 18px; }
.about .txt h3 span { color: #067cfa; }
.about .txt p { font-size: 14.5px; color: #666; line-height: 2.05; text-align: justify; margin-bottom: 14px; }
.about .badges { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
.about .badges span {
    font-size: 13px; color: #067cfa; background: rgba(6,124,250,.08);
    border: 1px solid rgba(6,124,250,.25); border-radius: 4px; padding: 6px 14px;
}

/* ---------- 里程碑 ---------- */
.milestone { background: #f5f5f5; padding-bottom: 90px; }
.milestone .timeline { max-width: 860px; margin: 0 auto; position: relative; padding-left: 30px; }
.milestone .timeline::before {
    content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px;
    width: 2px; background: #d8dee8;
}
.milestone .node { position: relative; padding-bottom: 26px; }
.milestone .node::before {
    content: ""; position: absolute; left: -28px; top: 6px;
    width: 12px; height: 12px; border-radius: 50%;
    background: #fff; border: 3px solid #067cfa;
}
.milestone .node .y { font-size: 18px; font-weight: 700; color: #067cfa; font-family: Georgia, serif; }
.milestone .node .e { font-size: 14.5px; color: #555; line-height: 1.9; margin-top: 6px; }
.milestone .node:hover::before { background: #067cfa; }

/* ---------- 页脚 ---------- */
.footer { background: #141525; color: #818286; }
.footer .top { padding: 54px 0 40px; display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.footer .brand .fname { font-size: 22px; color: #fff; font-weight: 700; letter-spacing: 1px; }
.footer .brand .fname em { font-style: normal; color: #00d2fa; }
.footer .brand p { margin-top: 16px; font-size: 13.5px; line-height: 2; max-width: 400px; }
.footer .links h5 { color: #fff; font-size: 15px; margin-bottom: 18px; letter-spacing: 1px; }
.footer .links a { display: block; font-size: 13.5px; margin-bottom: 11px; color: #818286; }
.footer .links a:hover { color: #00d2fa; }
.footer .contact h5 { color: #fff; font-size: 15px; margin-bottom: 18px; letter-spacing: 1px; }
.footer .contact p { font-size: 13.5px; line-height: 2.1; }
.footer .contact p span { color: #00d2fa; }
.footer .copyright {
    border-top: 1px solid rgba(255,255,255,.08); padding: 18px 0;
    font-size: 12.5px; text-align: center; color: #5b5d70;
}

/* ---------- 返回顶部 ---------- */
#toTop {
    position: fixed; right: 24px; bottom: -60px; z-index: 900;
    width: 46px; height: 46px; border-radius: 8px;
    background: #fff; color: #067cfa; font-size: 20px; cursor: pointer;
    border: 1px solid #ddd; box-shadow: 0 2px 14px rgba(0,0,0,.1);
    display: flex; align-items: center; justify-content: center;
    transition: bottom .4s, background .3s;
}
#toTop.show { bottom: 30px; }
#toTop:hover { background: #067cfa; color: #fff; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
    .adv .grid, .solutions .grid { grid-template-columns: repeat(2, 1fr); }
    .products .lines { grid-template-columns: 1fr; }
    .banner .slide-flex { flex-direction: column; gap: 26px; text-align: center; padding: 50px 6% 80px; }
    .banner .slide-flex ._right img { width: 320px; }
    .testing .wrap { flex-direction: column; }
    .testing .pic { min-height: 260px; }
    .testing .pic img { position: static; }
    .about .wrap { flex-direction: column; }
    .iconrow .row { gap: 40px; }
}
@media (max-width: 820px) {
    .nav {
        position: fixed; top: 68px; right: -100%; width: 74%; height: calc(100vh - 68px);
        background: #fff; flex-direction: column; align-items: flex-start;
        padding: 30px 30px; transition: right .4s; box-shadow: -10px 0 30px rgba(0,0,0,.08);
    }
    .nav.open { right: 0; }
    .nav a { margin: 0 0 24px; font-size: 16px; }
    .nav-toggle { display: block; }
    .nav-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .nav-toggle.open span:nth-child(2) { opacity: 0; }
    .nav-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
    .header .cta { display: none; }
    .sec-title { font-size: 24px; padding-top: 56px; }
    .banner .slide-flex ._left h2 { font-size: 24px; }
    .sdk .grid { grid-template-columns: 1fr; }
    .solutions .grid { grid-template-columns: 1fr; }
    .adv .grid { grid-template-columns: 1fr; }
    .platforms { gap: 34px; }
}

/* ---------- 官方线路检测中心 ---------- */
.linetest {
    background: linear-gradient(160deg, #10182b 0%, #1d2133 60%, #16213a 100%);
    padding: 74px 0 84px; position: relative; overflow: hidden;
}
.linetest::before {
    content: ""; position: absolute; left: 50%; top: -220px; transform: translateX(-50%);
    width: 900px; height: 500px; border-radius: 50%;
    background: radial-gradient(closest-side, rgba(6,124,250,.22), transparent);
}
.linetest .container { position: relative; z-index: 2; }
.linetest .lt-title { font-size: 32px; font-weight: 400; color: #fff; text-align: center; }
.linetest .lt-sub { font-size: 14.5px; color: rgba(255,255,255,.55); text-align: center; padding: 14px 0 44px; }
.linetest .panel { display: flex; align-items: center; justify-content: center; gap: 70px; flex-wrap: wrap; }

/* GO 按钮 + 仪表 */
.lt-gauge-wrap { position: relative; width: 300px; height: 300px; flex-shrink: 0; }
#ltGo {
    position: absolute; inset: 30px; border-radius: 50%; cursor: pointer; z-index: 5;
    background: rgba(6,124,250,.06);
    border: 2px solid rgba(0,210,250,.75);
    color: #00d2fa; font-size: 40px; font-weight: 300; letter-spacing: 6px;
    display: flex; align-items: center; justify-content: center;
    transition: all .35s; text-indent: 6px;
    box-shadow: 0 0 40px rgba(0,210,250,.15), inset 0 0 30px rgba(0,210,250,.08);
    user-select: none;
}
#ltGo:hover { background: rgba(0,210,250,.14); box-shadow: 0 0 60px rgba(0,210,250,.35), inset 0 0 40px rgba(0,210,250,.12); }
#ltGo.hide { opacity: 0; pointer-events: none; transform: scale(.7); }
.lt-gauge { position: absolute; inset: 0; opacity: 0; transition: opacity .5s; }
.lt-gauge.show { opacity: 1; }
.lt-gauge svg { width: 100%; height: 100%; }
.lt-center {
    position: absolute; inset: 0; display: flex; flex-direction: column;
    align-items: center; justify-content: center; text-align: center;
}
.lt-center .num { font-size: 52px; font-weight: 700; color: #fff; font-family: Georgia, "Segoe UI", sans-serif; line-height: 1; }
.lt-center .unit { font-size: 13px; color: rgba(255,255,255,.5); letter-spacing: 3px; margin-top: 8px; }
.lt-center .stage { font-size: 12.5px; color: #00d2fa; margin-top: 12px; letter-spacing: 1px; min-height: 18px; }

/* 节点列表 */
.lt-nodes { flex: 1; min-width: 300px; max-width: 560px; }
.lt-node {
    background: rgba(255,255,255,.045); border: 1px solid rgba(255,255,255,.08);
    border-radius: 6px; padding: 14px 18px; margin-bottom: 12px;
    display: flex; align-items: center; gap: 14px; transition: all .3s;
}
.lt-node:hover { border-color: rgba(0,210,250,.4); }
.lt-node .ico {
    flex-shrink: 0; width: 38px; height: 38px; border-radius: 8px;
    background: rgba(6,124,250,.18); color: #00d2fa;
    display: flex; align-items: center; justify-content: center; font-size: 17px; font-weight: 700;
}
.lt-node .info { flex: 1; min-width: 0; }
.lt-node .info .n { font-size: 15px; color: #fff; font-weight: 500; }
.lt-node .info .d { font-size: 12px; color: rgba(255,255,255,.4); margin-top: 2px; }
.lt-node .bar { flex: 1.1; height: 5px; border-radius: 3px; background: rgba(255,255,255,.1); overflow: hidden; }
.lt-node .bar i {
    display: block; height: 100%; width: 0; border-radius: 3px;
    background: linear-gradient(90deg, #067cfa, #00d2fa); transition: width .6s ease;
}
.lt-node .ms { flex-shrink: 0; width: 74px; text-align: right; font-size: 16px; font-weight: 700; color: #fff; font-family: Georgia, serif; }
.lt-node .st {
    flex-shrink: 0; width: 58px; text-align: center; font-size: 12px;
    border-radius: 12px; padding: 3px 0; color: rgba(255,255,255,.45);
    background: rgba(255,255,255,.08);
}
.lt-node .st.good { color: #2ee6a8; background: rgba(46,230,168,.12); }
.lt-node .st.ok { color: #ffc53d; background: rgba(255,197,61,.12); }
.lt-node .st.slow { color: #ff8f5a; background: rgba(255,143,90,.12); }
.lt-node .st.bad { color: #ff5a5a; background: rgba(255,90,90,.14); }

/* 结论条 */
.lt-result {
    margin-top: 34px; text-align: center; min-height: 30px;
    font-size: 15px; color: rgba(255,255,255,.85); letter-spacing: 1px;
}
.lt-result b { color: #00d2fa; }
.lt-result .again {
    display: inline-block; margin-left: 18px; padding: 5px 18px; border-radius: 16px;
    border: 1px solid rgba(0,210,250,.5); color: #00d2fa; font-size: 13px; cursor: pointer;
    transition: all .3s;
}
.lt-result .again:hover { background: rgba(0,210,250,.15); }
.lt-meta { margin-top: 14px; text-align: center; font-size: 12px; color: rgba(255,255,255,.3); letter-spacing: 1px; }

@media (max-width: 820px) {
    .linetest .panel { gap: 34px; }
    .lt-gauge-wrap { width: 250px; height: 250px; }
    #ltGo { font-size: 32px; }
    .lt-center .num { font-size: 40px; }
    .lt-node .bar { display: none; }
    .linetest .lt-title { font-size: 24px; }
}

/* ============================================================
   科技感背景体系: 浅色科技底 / 深蓝科技底 交替铺排
   ============================================================ */
.bg-tech-light {
    position: relative;
    background:
        radial-gradient(640px 320px at 92% 0%, rgba(0,210,250,.09), transparent 70%),
        radial-gradient(560px 340px at 4% 100%, rgba(6,124,250,.08), transparent 70%),
        linear-gradient(180deg, #f4f8fe 0%, #edf4fc 100%);
}
.bg-tech-light::before {
    content: ""; position: absolute; inset: 0; pointer-events: none;
    background-image:
        linear-gradient(rgba(6,124,250,.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(6,124,250,.05) 1px, transparent 1px);
    background-size: 42px 42px;
    -webkit-mask-image: linear-gradient(180deg, transparent, #000 10%, #000 90%, transparent);
    mask-image: linear-gradient(180deg, transparent, #000 10%, #000 90%, transparent);
}
.bg-tech-light > .container { position: relative; z-index: 2; }

.bg-tech-dark {
    position: relative;
    background:
        radial-gradient(720px 380px at 88% -8%, rgba(0,210,250,.13), transparent 70%),
        radial-gradient(620px 420px at 0% 108%, rgba(6,124,250,.16), transparent 70%),
        linear-gradient(165deg, #0d1a33 0%, #122448 55%, #0e1d3c 100%);
}
.bg-tech-dark::before {
    content: ""; position: absolute; inset: 0; pointer-events: none;
    background-image:
        linear-gradient(rgba(0,210,250,.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,210,250,.045) 1px, transparent 1px);
    background-size: 46px 46px;
    -webkit-mask-image: linear-gradient(180deg, transparent, #000 10%, #000 90%, transparent);
    mask-image: linear-gradient(180deg, transparent, #000 10%, #000 90%, transparent);
}
.bg-tech-dark::after {
    content: ""; position: absolute; left: 0; right: 0; top: 0; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,210,250,.55), transparent);
}
.bg-tech-dark > .container { position: relative; z-index: 2; }
.bg-tech-dark .sec-title { color: #fff; }
.bg-tech-dark .sec-sub { color: rgba(255,255,255,.55); }

/* --- 浅色科技底上的卡片改纯白, 增强悬浮感 --- */
.adv.bg-tech-light .card,
.solutions.bg-tech-light .card { background: #fff; }
.products.bg-tech-light .line { background: #fff; }
.bg-tech-light .platforms .p-item span { color: #333; }

/* --- 检测项目: 深蓝底 --- */
.testing.bg-tech-dark .items dt {
    background: rgba(255,255,255,.05);
    border: 1px solid rgba(255,255,255,.09);
    color: rgba(255,255,255,.85);
    box-shadow: none;
}
.testing.bg-tech-dark .items dt::before { color: #00d2fa; }
.testing.bg-tech-dark .items dt:hover {
    background: rgba(0,210,250,.1); border-color: rgba(0,210,250,.45);
    color: #fff; box-shadow: 0 8px 24px rgba(0,0,0,.3);
}
.testing.bg-tech-dark .pic {
    background: rgba(255,255,255,.06);
    box-shadow: 0 0 0 1px rgba(0,210,250,.25), 0 16px 40px rgba(0,0,0,.35);
}

/* --- SDK: 深蓝底 --- */
.sdk.bg-tech-dark .card {
    background: rgba(255,255,255,.05);
    border: 1px solid rgba(255,255,255,.09);
    box-shadow: none;
}
.sdk.bg-tech-dark .card:hover {
    background: rgba(0,210,250,.08); border-color: rgba(0,210,250,.4);
    box-shadow: 0 10px 26px rgba(0,0,0,.3);
}
.sdk.bg-tech-dark .card h3 { color: #fff; }
.sdk.bg-tech-dark .card p { color: rgba(255,255,255,.55); }
.sdk.bg-tech-dark .card h3 img { filter: drop-shadow(0 0 6px rgba(0,210,250,.35)); }

/* --- 图标排(定制开发/业务咨询): 深蓝底 --- */
.iconrow.bg-tech-dark .item .intr { color: rgba(255,255,255,.7); }
.iconrow.bg-tech-dark .item img {
    background: rgba(255,255,255,.06); border-radius: 16px; padding: 10px;
    border: 1px solid rgba(255,255,255,.08);
    transition: all .3s;
}
.iconrow.bg-tech-dark .item:hover img {
    border-color: rgba(0,210,250,.45);
    box-shadow: 0 0 24px rgba(0,210,250,.25);
    transform: translateY(-4px);
}

/* --- 里程碑: 深蓝底 --- */
.milestone.bg-tech-dark .timeline::before { background: rgba(255,255,255,.14); }
.milestone.bg-tech-dark .node::before { background: #0d1a33; border-color: #00d2fa; }
.milestone.bg-tech-dark .node:hover::before { background: #00d2fa; box-shadow: 0 0 14px rgba(0,210,250,.6); }
.milestone.bg-tech-dark .node .y { color: #00d2fa; }
.milestone.bg-tech-dark .node .e { color: rgba(255,255,255,.62); }

/* ---------- 常见问题解答 ---------- */
.faq { padding-bottom: 90px; }
.faq .list { max-width: 920px; margin: 0 auto; }
.faq details {
    background: #fff; border: 1px solid #e2eaf5; border-radius: 6px;
    margin-bottom: 12px; overflow: hidden; transition: all .3s;
}
.faq details[open] {
    border-color: rgba(6,124,250,.45);
    box-shadow: 0 10px 28px rgba(6,124,250,.1);
}
.faq summary {
    cursor: pointer; list-style: none; padding: 17px 22px;
    display: flex; align-items: center; font-size: 15.5px; font-weight: 500; color: #333;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .no {
    flex-shrink: 0; width: 32px; height: 32px; border-radius: 8px; margin-right: 15px;
    background: rgba(6,124,250,.1); color: #067cfa;
    font-family: Georgia, serif; font-weight: 800; font-size: 13px;
    display: flex; align-items: center; justify-content: center;
}
.faq details[open] summary .no {
    background: linear-gradient(135deg, #067cfa, #00d2fa); color: #fff;
}
.faq summary .arr { margin-left: auto; color: #b3bcc8; transition: transform .3s; flex-shrink: 0; }
.faq details[open] summary .arr { transform: rotate(90deg); color: #067cfa; }
.faq .ans {
    padding: 0 24px 20px 69px; font-size: 14px; line-height: 2; color: #5a6472;
}
.faq .ans b { color: #067cfa; font-weight: 600; }
@media (max-width: 820px) {
    .faq .ans { padding-left: 22px; }
}