/* ===== 全局基础 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    background: #FFFFFF;
    color: #1A2A3A;
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }

.bfap { width: 1200px; max-width: 96%; margin: 0 auto; }

/* 通用按钮：暖橙渐变 */
.bfdb {
    display: inline-flex; align-items: center; gap: 6px;
    background: linear-gradient(135deg, #0277BD 0%, #039BE5 100%);
    color: #FFFFFF;
    padding: 12px 26px; border-radius: 24px;
    font-weight: 700; font-size: 15px;
    border: 2px solid #0277BD;
    transition: all 0.3s ease;
}
.bfdb:hover { background: linear-gradient(135deg, #01579B 0%, #0277BD 100%); border-color: #01579B; }
.bfdb i { font-size: 18px; }
.bfdb1 { background: #1A2A3A; border-color: #1A2A3A; }
.bfdb1:hover { background: #1A2330; border-color: #1A2330; }
.bflnk {
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(255,255,255,0.12); color: #FFFFFF;
    padding: 12px 26px; border-radius: 24px;
    font-weight: 700; font-size: 15px;
    border: 2px solid rgba(255,255,255,0.6);
    transition: all 0.3s ease;
}
.bflnk:hover { background: #FFFFFF; color: #0277BD; border-color: #FFFFFF; }

/* ===== 头部 ===== */
.bfhd {
    position: sticky; top: 0; z-index: 100;
    background: #FFFFFF;
    border-bottom: 3px solid #0277BD;
}
.bfhbox {
    display: flex; align-items: center; justify-content: space-between;
    height: 72px; gap: 24px;
}
.bflg {
    display: flex; align-items: center; gap: 10px;
    color: #1A2A3A;
}
.bflg img {
    width: 44px; height: 44px; border-radius: 14px;
    border: 2px solid #0277BD;
    background: linear-gradient(135deg, #0277BD 0%, #039BE5 100%);
}
.bflg span {
    font-size: 20px; font-weight: 700;
    display: flex; align-items: baseline; gap: 8px;
    letter-spacing: 1px;
}
.bflg em {
    font-style: normal; font-size: 12px;
    color: #0277BD; font-weight: 600;
    padding: 2px 10px; border: 1px solid #0277BD;
    border-radius: 12px;
}
.bfnv { display: flex; gap: 4px; flex: 1; justify-content: center; }
.bfnv a {
    padding: 8px 14px; font-size: 15px;
    color: #6B7A8A; border-radius: 20px;
    transition: all 0.3s ease;
    position: relative;
}
.bfnv a::after {
    content: ""; position: absolute; left: 50%; bottom: 2px;
    width: 0; height: 3px; background: #0277BD;
    border-radius: 2px;
    transition: all 0.3s ease; transform: translateX(-50%);
}
.bfnv a:hover { color: #0277BD; }
.bfnv a:hover::after { width: 60%; }
.bfrt { display: flex; align-items: center; gap: 12px; }
.bfmenu {
    display: none; color: #0277BD; font-size: 26px;
    padding: 4px;
}
.bfmnv {
    display: none;
    flex-direction: column; gap: 4px;
    padding: 12px 20px 20px;
    background: #FFFFFF;
    border-top: 2px solid #B3D9F2;
}
.bfmnv a {
    color: #6B7A8A; padding: 10px 12px;
    border-radius: 12px; font-size: 15px;
}
.bfmnv a:hover { background: #E1F0FA; color: #0277BD; }
.bfmnv .bfdb { color: #FFFFFF; justify-content: center; margin-top: 8px; }

/* ===== 主视觉：暖橙渐变质感 ===== */
.bfman {
    background: linear-gradient(135deg, #0277BD 0%, #039BE5 45%, #4FC3F7 100%);
    position: relative; overflow: hidden;
    padding: 70px 0 80px;
}
.bfman::before {
    content: ""; position: absolute; top: 0; right: 0;
    width: 50%; height: 100%;
    background:
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.18) 0, transparent 40%),
        radial-gradient(circle at 50% 80%, rgba(45,58,74,0.12) 0, transparent 50%);
    pointer-events: none;
}
.bfbox {
    display: flex; align-items: center; gap: 40px;
    position: relative; z-index: 1;
}
.bfat { flex: 1; }
.bfseal {
    display: inline-flex; align-items: center; gap: 6px;
    color: #FFFFFF; font-size: 13px;
    padding: 6px 16px;
    background: rgba(45,58,74,0.85);
    border: 2px solid #1A2A3A;
    border-radius: 20px;
    margin-bottom: 22px;
    letter-spacing: 2px;
    font-weight: 700;
}
.bfat h1 {
    font-size: 68px; color: #FFFFFF;
    letter-spacing: 6px; line-height: 1.1;
    margin-bottom: 14px; font-weight: 800;
}
.bf-sub {
    font-size: 26px; color: #FFFFFF;
    letter-spacing: 2px; margin-bottom: 22px;
    font-weight: 700;
    opacity: 0.95;
}
.bf-desc {
    color: #FFFFFF; font-size: 15px;
    max-width: 480px; margin-bottom: 32px;
    line-height: 1.9;
    opacity: 0.92;
    background: rgba(45,58,74,0.20);
    padding: 14px 18px;
    border-radius: 16px;
    border-left: 4px solid #FFFFFF;
}
.bfbtn { display: flex; gap: 16px; margin-bottom: 40px; }
.bfstat { display: flex; gap: 36px; }
.bfstat li { display: flex; flex-direction: column; }
.bfstat b {
    font-size: 26px; color: #FFFFFF;
    font-weight: 800; letter-spacing: 1px;
}
.bfstat span { font-size: 13px; color: #FFFFFF; margin-top: 2px; opacity: 0.85; }

/* 手机 mockup */
.bfmo {
    flex: 0 0 380px; position: relative;
    height: 520px; display: flex; justify-content: center;
}
.bfmfm {
    position: absolute; top: 0; left: 50%;
    transform: translateX(-50%);
    width: 240px; height: 480px;
    border: 4px solid #FFFFFF;
    border-radius: 32px;
    background: #FFFFFF;
    padding: 10px; overflow: hidden;
}
.bfmwall {
    display: block; width: 100%; height: 12px;
    background: #0277BD; border-radius: 6px;
    margin-bottom: 6px;
}
.bfmfm img {
    width: 100%; height: calc(100% - 18px);
    object-fit: cover; border-radius: 20px;
}
.bfmtwo {
    width: 200px; height: 400px;
    top: 80px; left: 22%;
    transform: rotate(-8deg);
    border-color: #1A2A3A;
    opacity: 0.92;
    z-index: -1;
}

/* ===== 通用 section ===== */
.bfse { padding: 72px 0; }
.bfbe { background: #E8F4FA; }
.bftt {
    margin-bottom: 50px;
    display: flex; align-items: center; gap: 16px;
    position: relative;
}
.bfba {
    width: 10px; height: 40px; border-radius: 6px;
    background: linear-gradient(180deg, #0277BD 0%, #039BE5 100%);
}
.bftx {
    font-size: 32px; color: #1A2A3A;
    letter-spacing: 4px; font-weight: 800;
}
.bfbs {
    font-size: 13px; color: #0277BD;
    letter-spacing: 3px;
    padding: 5px 14px;
    border: 2px solid #0277BD;
    border-radius: 16px;
    font-weight: 700;
}
.bftt::after {
    content: ""; flex: 1; height: 3px;
    background: linear-gradient(90deg, #0277BD 0%, transparent 100%);
    border-radius: 2px;
}

/* ===== 产品展示 ===== */
.bfcq {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.bfci {
    background: #FFFFFF; border: 2px solid #B3D9F2;
    border-radius: 20px; overflow: hidden;
    transition: all 0.3s ease;
    position: relative;
}
.bfci::before {
    content: ""; position: absolute; top: 0; left: 0; right: 0;
    height: 5px;
    background: linear-gradient(90deg, #0277BD 0%, #039BE5 100%);
    z-index: 2;
}
.bfci:hover { transform: translateY(-6px); border-color: #0277BD; }
.bfciimg { width: 100%; height: 240px; overflow: hidden; }
.bfciimg img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s ease; }
.bfci:hover .bfciimg img { transform: scale(1.05); }
.bfic {
    text-align: center; padding: 14px;
    color: #1A2A3A; font-size: 16px;
    font-weight: 700; letter-spacing: 1px;
    border-top: 2px dashed #B3D9F2;
    background: #FFFFFF;
    display: flex; align-items: center; justify-content: center; gap: 6px;
}
.bfic i { font-size: 18px; color: #0277BD; }

/* ===== 优势亮点 ===== */
.bfys {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.bfysc {
    background: #FFFFFF; border: 2px solid #B3D9F2;
    border-radius: 22px; padding: 30px 26px;
    text-align: center; transition: all 0.3s ease;
    position: relative;
}
.bfysc::after {
    content: ""; position: absolute; top: 16px; left: 16px;
    right: 16px; bottom: 16px;
    border: 1px dashed rgba(255,107,53,0.25);
    border-radius: 14px;
    pointer-events: none;
}
.bfysc:hover { background: linear-gradient(135deg, #0277BD 0%, #039BE5 100%); border-color: #0277BD; }
.bfysc:hover .bfyi { background: #FFFFFF; color: #0277BD; border-color: #FFFFFF; }
.bfysc:hover .bfyt { color: #FFFFFF; }
.bfysc:hover .bfyd { color: #FFFFFF; opacity: 0.92; }
.bfysc:hover .bfyn { color: rgba(255,255,255,0.35); }
.bfysc:hover::after { border-color: rgba(255,255,255,0.35); }
.bfyn {
    position: absolute; top: 14px; right: 20px;
    font-size: 38px; color: rgba(255,107,53,0.25);
    font-weight: 800; line-height: 1;
    z-index: 2; transition: all 0.3s ease;
}
.bfyi {
    width: 64px; height: 64px; border-radius: 50%;
    background: #E1F0FA; color: #0277BD;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 30px; margin: 0 auto 16px;
    border: 2px solid #0277BD;
    transition: all 0.3s ease;
}
.bfyt {
    font-size: 20px; color: #1A2A3A;
    font-weight: 700; margin-bottom: 10px;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}
.bfyd {
    font-size: 14px; color: #6B7A8A;
    line-height: 1.8;
    transition: all 0.3s ease;
}

/* ===== 下载中心 ===== */
.bfdl {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.bfdli {
    background: #FFFFFF; border: 2px solid #B3D9F2;
    border-radius: 22px; padding: 28px 24px;
    text-align: center; transition: all 0.3s ease;
    position: relative; overflow: hidden;
}
.bfdli::before {
    content: ""; position: absolute; top: 0; left: 0; right: 0;
    height: 5px;
    background: linear-gradient(90deg, #0277BD 0%, #039BE5 100%);
}
.bfdli:hover { transform: translateY(-4px); border-color: #0277BD; background: #E1F0FA; }
.bfdlii {
    width: 60px; height: 60px; border-radius: 18px;
    background: linear-gradient(135deg, #0277BD 0%, #039BE5 100%);
    color: #FFFFFF;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 28px; margin: 0 auto 14px;
    border: 2px solid #0277BD;
    position: relative; z-index: 1;
    transition: all 0.3s ease;
}
.bfdli:nth-child(2n) .bfdlii { background: #1A2A3A; border-color: #1A2A3A; }
.bfdli:nth-child(3n) .bfdlii { background: linear-gradient(135deg, #0277BD 0%, #039BE5 100%); border-color: #0277BD; }
.bfdlt {
    font-size: 17px; color: #1A2A3A; font-weight: 700;
    margin-bottom: 6px; letter-spacing: 0;
    position: relative; z-index: 1;
    min-height: 26px; display: flex; align-items: center; justify-content: center;
}
.bfdlb {
    font-size: 13px; color: #6B7A8A;
    margin-bottom: 18px; position: relative; z-index: 1;
}
.bfdlr {
    display: inline-flex; align-items: center; gap: 6px;
    background: linear-gradient(135deg, #0277BD 0%, #039BE5 100%);
    color: #FFFFFF;
    padding: 9px 20px; border-radius: 20px;
    font-weight: 700; font-size: 14px;
    border: 2px solid #0277BD;
    transition: all 0.3s ease;
    position: relative; z-index: 1;
}
.bfdlr:hover { background: #1A2A3A; border-color: #1A2A3A; }
.bfdlr i { font-size: 16px; }

/* ===== 使用流程 ===== */
.bflc {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 20px; position: relative;
}
.bflc::before {
    content: ""; position: absolute; top: 50px; left: 12%;
    right: 12%; height: 3px;
    background: linear-gradient(90deg, transparent 0%, #0277BD 20%, #0277BD 80%, transparent 100%);
    border-radius: 2px;
    z-index: 0;
}
.bflci {
    text-align: center; position: relative; z-index: 1;
    background: #FFFFFF; border: 2px solid #B3D9F2;
    border-radius: 20px; padding: 26px 18px 24px;
    transition: all 0.3s ease;
}
.bflci:hover { transform: translateY(-4px); border-color: #0277BD; background: #E1F0FA; }
.bfln {
    font-size: 30px; color: #0277BD; font-weight: 800;
    letter-spacing: 2px; margin-bottom: 10px;
}
.bflb {
    width: 30px; height: 30px; border-radius: 50%;
    background: linear-gradient(135deg, #0277BD 0%, #039BE5 100%);
    border: 4px solid #FFFFFF;
    margin: 0 auto 18px;
    outline: 3px solid #0277BD;
    outline-offset: 0;
}
.bflt {
    font-size: 18px; color: #1A2A3A; font-weight: 700;
    margin-bottom: 8px; letter-spacing: 1px;
}
.bfld { font-size: 13px; color: #6B7A8A; line-height: 1.8; }

/* ===== 常见问题 ===== */
.bfwt {
    max-width: 880px; margin: 0 auto;
    display: flex; flex-direction: column; gap: 14px;
}
.bfwti {
    background: #FFFFFF; border: 2px solid #B3D9F2;
    border-radius: 18px; overflow: hidden;
    transition: all 0.3s ease;
}
.bfwti.active { border-color: #0277BD; background: #E1F0FA; }
.bfwh {
    display: flex; align-items: center; justify-content: space-between;
    padding: 18px 22px; cursor: pointer;
    transition: all 0.3s ease;
}
.bfwq {
    display: flex; align-items: center; gap: 8px;
    font-size: 16px; color: #1A2A3A; font-weight: 700;
    letter-spacing: 1px;
}
.bfwq i { color: #0277BD; font-size: 18px; }
.bfwi {
    color: #0277BD; font-size: 22px;
    transition: transform 0.3s ease, color 0.3s ease;
}
.bfwti.active .bfwi { transform: rotate(180deg); }
.bfwb {
    max-height: 0; overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    padding: 0 22px;
}
.bfwti.active .bfwb { max-height: 200px; padding: 0 22px 18px; }
.bfwb p {
    font-size: 14px; color: #6B7A8A; line-height: 1.9;
    border-top: 2px dashed #B3D9F2; padding-top: 14px;
    margin-top: 4px;
}

/* ===== 产品资讯 ===== */
.bfzx {
    display: grid; grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.bfzxi {
    background: #FFFFFF; border: 2px solid #B3D9F2;
    border-radius: 18px; padding: 24px;
    display: flex; gap: 20px; align-items: flex-start;
    transition: all 0.3s ease;
    border-left: 8px solid #0277BD;
}
.bfzxi:nth-child(2n) { border-left-color: #1A2A3A; }
.bfzxi:nth-child(3n) { border-left-color: #039BE5; }
.bfzxi:hover { transform: translateX(6px); border-color: #0277BD; background: #E1F0FA; }
.bfzimg {
    flex: 0 0 64px; width: 64px; height: 64px;
    border-radius: 16px; background: #E1F0FA;
    color: #0277BD; font-size: 30px;
    display: flex; align-items: center; justify-content: center;
    border: 2px solid #0277BD;
}
.bfztxt { flex: 1; }
.bfzt {
    font-size: 17px; color: #1A2A3A; font-weight: 700;
    margin-bottom: 4px; letter-spacing: 1px; line-height: 1.5;
}
.bfzm {
    font-size: 12px; color: #0277BD; margin-bottom: 8px;
    letter-spacing: 1px; font-weight: 700;
}
.bfzd { font-size: 14px; color: #6B7A8A; line-height: 1.8; }

/* ===== 用户评价 ===== */
.bfpj {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 24px; align-items: start;
}
.bfpji {
    background: #FFFFFF; border: 2px solid #B3D9F2;
    border-radius: 20px; padding: 24px 22px;
    transition: all 0.3s ease;
    position: relative;
}
.bfpji::before {
    content: ""; position: absolute; top: 0; left: 0; right: 0;
    height: 5px; border-radius: 18px 18px 0 0;
    background: linear-gradient(90deg, #0277BD 0%, #039BE5 100%);
}
.bfpji:hover { border-color: #0277BD; background: #E1F0FA; }
.bfpji::after {
    content: "\201D"; position: absolute; top: 6px; right: 16px;
    font-size: 60px; color: #0277BD; opacity: 0.25;
    font-family: serif; line-height: 1;
    font-weight: 800;
}
.bfph {
    display: flex; align-items: center; gap: 12px;
    margin-bottom: 14px;
}
.bfpa {
    width: 44px; height: 44px; border-radius: 50%;
    background: #E1F0FA; color: #0277BD;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px; border: 2px solid #0277BD;
}
.bfpn {
    font-size: 16px; color: #1A2A3A; font-weight: 700;
    letter-spacing: 1px;
}
.bfpt { font-size: 12px; color: #0277BD; margin-top: 2px; font-weight: 700; }
.bfpd { font-size: 14px; color: #6B7A8A; line-height: 1.9; }

/* ===== 页脚 ===== */
.bfft {
    background: #1A2A3A; color: #A8C5D9;
    padding: 50px 0 0; border-top: 5px solid #0277BD;
    position: relative;
}
.bffttop {
    display: flex; align-items: flex-start; justify-content: space-between;
    gap: 40px; padding-bottom: 30px;
    border-bottom: 2px dashed rgba(255,107,53,0.35);
    position: relative;
}
.bfftb { flex: 1; max-width: 360px; }
.bfftb .bflg { margin-bottom: 14px; color: #FFFFFF; }
.bfftb .bflg img { background: linear-gradient(135deg, #0277BD 0%, #039BE5 100%); border-color: #0277BD; }
.bfftb .bflg em { color: #4FC3F7; border-color: #4FC3F7; }
.bfftd { font-size: 14px; color: #A8C5D9; line-height: 1.9; }
.bfftn {
    display: flex; flex-wrap: wrap; gap: 8px 18px;
    flex: 2; justify-content: center;
    align-content: center;
}
.bfftn a {
    color: #A8C5D9; font-size: 14px;
    padding: 4px 8px; border-radius: 8px;
    transition: all 0.3s ease;
}
.bfftn a:hover { color: #FFFFFF; background: rgba(255,107,53,0.20); }
.bfftdl { flex: 0 0 auto; }
.bfftbot {
    padding: 18px 0; text-align: center;
    font-size: 13px; color: #4FC3F7;
    display: flex; flex-direction: column; gap: 4px;
}

/* ===== 返回顶部 ===== */
.bftop {
    position: fixed; right: 28px; bottom: 28px;
    width: 48px; height: 48px; border-radius: 50%;
    background: linear-gradient(135deg, #0277BD 0%, #039BE5 100%);
    color: #FFFFFF;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; border: 3px solid #FFFFFF;
    opacity: 0; visibility: hidden;
    transition: all 0.3s ease; z-index: 99;
    outline: 2px solid #0277BD;
    outline-offset: 0;
}
.bftop.show { opacity: 1; visibility: visible; }
.bftop:hover { background: #1A2A3A; border-color: #0277BD; outline-color: #1A2A3A; }

/* ===== 移动端 (767px 断点) ===== */
@media (max-width: 767px) {
    body { font-size: 15px; }
    .bfnv, .bfrt .bfdb { display: none; }
    .bfmenu { display: block; }
    .bfhbox { height: 60px; gap: 12px; }
    .bflg img { width: 38px; height: 38px; }
    .bflg span { font-size: 17px; }
    .bflg em { font-size: 10px; padding: 1px 6px; }

    .bfman { padding: 40px 0 50px; }
    .bfbox { flex-direction: column; gap: 30px; text-align: center; }
    .bfat { order: 2; }
    .bfmo { flex: 0 0 auto; order: 1; height: 380px; width: 100%; }
    .bfmfm { width: 180px; height: 360px; }
    .bfmtwo { width: 150px; height: 300px; }
    .bfat h1 { font-size: 44px; letter-spacing: 3px; }
    .bf-sub { font-size: 18px; }
    .bf-desc { font-size: 14px; margin: 0 auto 24px; text-align: left; }
    .bfbtn { justify-content: center; }
    .bfstat { justify-content: center; gap: 18px; flex-wrap: wrap; }
    .bfstat b { font-size: 20px; }

    .bfse { padding: 50px 0; }
    .bftt { margin-bottom: 36px; gap: 10px; }
    .bftx { font-size: 24px; letter-spacing: 2px; }
    .bfbs { display: none; }
    .bfba { height: 32px; }

    .bfcq { grid-template-columns: 1fr; gap: 18px; }
    .bfciimg { height: 200px; }

    .bfys { grid-template-columns: 1fr; gap: 18px; }
    .bfysc { padding: 24px 20px; }

    .bfdl { grid-template-columns: 1fr; gap: 18px; }

    .bflc { grid-template-columns: 1fr; gap: 18px; }
    .bflc::before { display: none; }

    .bfwt { gap: 12px; }
    .bfwh { padding: 14px 16px; }
    .bfwq { font-size: 15px; }

    .bfzx { grid-template-columns: 1fr; gap: 18px; }
    .bfzxi { padding: 18px; gap: 14px; }
    .bfzimg { flex: 0 0 52px; width: 52px; height: 52px; font-size: 24px; }

    .bfpj { grid-template-columns: 1fr; gap: 18px; }

    .bffttop { flex-direction: column; gap: 24px; padding-bottom: 24px; }
    .bfftn { justify-content: flex-start; }
    .bfftdl { align-self: flex-start; }
    .bftop { right: 16px; bottom: 16px; width: 42px; height: 42px; font-size: 20px; }
}