/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: #1f2d3d;
    background: #f6f9fd;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
}

.wrap {
    width: 92%;
    max-width: 1180px;
    margin: 0 auto;
}

/* 顶部条 */
.tbar {
    background: #0b1e3a;
    color: #c9d6e8;
    font-size: 13px;
    padding: 8px 0;
}

.tbar .wrap {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}

.tbar a {
    color: #c9d6e8;
    margin-left: 16px;
    transition: 0.2s;
}

.tbar a:hover {
    color: #fff;
}

/* 头部导航 */
.hd {
    background: #fff;
    box-shadow: 0 2px 12px rgba(0, 30, 80, 0.06);
    position: sticky;
    top: 0;
    z-index: 100;
}

.hd .wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.lg {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: #0b1e3a;
}

.lg img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav a {
    padding: 10px 18px;
    border-radius: 10px;
    font-size: 15px;
    color: #3a4d6b;
    transition: 0.2s;
    font-weight: 500;
}

.nav a:hover {
    background: #eef4fb;
    color: #0066cc;
}

.nav a.on {
    background: #0066cc;
    color: #fff;
}

.nav a.dlb {
    background: linear-gradient(135deg, #0066cc, #0088ff);
    color: #fff;
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

.nav a.dlb:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 102, 204, 0.4);
}

/* Hero 主视觉 */
.hero {
    background: linear-gradient(135deg, #0a1628 0%, #13294b 50%, #1a3a6b 100%);
    color: #fff;
    padding: 80px 0 70px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 140, 255, 0.18), transparent 70%);
    top: -200px;
    right: -100px;
    border-radius: 50%;
}

.hero .wrap {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero h1 {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
}

.hero h1 em {
    font-style: normal;
    color: #4db8ff;
}

.hero p {
    max-width: 760px;
    margin: 0 auto 34px;
    color: #b8c9e0;
    font-size: 16px;
}

.btns {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 50px;
}

.btns a {
    display: inline-block;
    padding: 15px 34px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: 0.2s;
}

.btns .win {
    background: linear-gradient(135deg, #0066cc, #0088ff);
    color: #fff;
    box-shadow: 0 8px 22px rgba(0, 102, 204, 0.35);
}

.btns .mac {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.btns a:hover {
    transform: translateY(-2px);
}

.nums {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.nums .it {
    text-align: center;
}

.nums .it b {
    display: block;
    font-size: 28px;
    color: #4db8ff;
    font-weight: 700;
}

.nums .it span {
    font-size: 14px;
    color: #b8c9e0;
}

/* 面包屑 */
.crumb {
    background: #fff;
    border-bottom: 1px solid #e8eef7;
    padding: 14px 0;
    font-size: 13px;
    color: #7a8ba3;
}

.crumb a {
    color: #0066cc;
}

.crumb span {
    margin: 0 6px;
}

/* 通用区块 */
.sec {
    padding: 70px 0;
    background: #fff;
}

.sec.sg {
    background: #f6f9fd;
}

.st2 {
    text-align: center;
    font-size: 30px;
    font-weight: 700;
    color: #0b1e3a;
    margin-bottom: 12px;
}

.sd2 {
    text-align: center;
    color: #7a8ba3;
    max-width: 680px;
    margin: 0 auto 50px;
    font-size: 15px;
}

/* 三列功能 */
.g3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.fc {
    background: #fff;
    border: 1px solid #e8eef7;
    border-radius: 18px;
    padding: 32px 26px;
    transition: 0.25s;
    box-shadow: 0 4px 14px rgba(0, 30, 80, 0.04);
}

.fc:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 36px rgba(0, 60, 140, 0.1);
    border-color: #c7d7ec;
}

.fc .ic {
    font-size: 34px;
    display: block;
    margin-bottom: 16px;
}

.fc h3 {
    font-size: 18px;
    color: #0b1e3a;
    margin-bottom: 10px;
}

.fc p {
    color: #5e6f8d;
    font-size: 14px;
}

/* 左右布局 */
.row {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 50px;
    align-items: center;
}

.tx h3 {
    font-size: 26px;
    color: #0b1e3a;
    margin-bottom: 16px;
}

.tx p {
    color: #5e6f8d;
    margin-bottom: 20px;
}

.tx ul {
    list-style: none;
}

.tx ul li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 10px;
    color: #3a4d6b;
}

.tx ul li::before {
    content: '✔';
    position: absolute;
    left: 0;
    color: #0066cc;
    font-weight: 700;
}

.pic {
    font-size: 120px;
    text-align: center;
    opacity: 0.85;
}

/* 两列下载卡片 */
.g2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.dc {
    background: #fff;
    border: 1px solid #e8eef7;
    border-radius: 20px;
    padding: 34px 30px;
    text-align: center;
    box-shadow: 0 4px 14px rgba(0, 30, 80, 0.04);
    transition: 0.25s;
}

.dc:hover {
    box-shadow: 0 16px 40px rgba(0, 60, 140, 0.12);
    transform: translateY(-3px);
}

.dc .ic {
    font-size: 44px;
    display: block;
    margin-bottom: 14px;
}

.dc h3 {
    font-size: 20px;
    color: #0b1e3a;
    margin-bottom: 8px;
}

.dc .ver {
    font-size: 13px;
    color: #7a8ba3;
    margin-bottom: 14px;
}

.dc p {
    color: #5e6f8d;
    font-size: 14px;
    margin-bottom: 22px;
}

.dc .btn {
    display: inline-block;
    padding: 12px 32px;
    background: linear-gradient(135deg, #0066cc, #0088ff);
    color: #fff;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 6px 16px rgba(0, 102, 204, 0.25);
}

.dc .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(0, 102, 204, 0.35);
}

/* 文章列表 */
.ar {
    background: #fff;
    border: 1px solid #e8eef7;
    border-radius: 16px;
    padding: 26px 28px;
    margin-bottom: 18px;
    transition: 0.2s;
}

.ar:hover {
    border-color: #c7d7ec;
    box-shadow: 0 10px 26px rgba(0, 60, 140, 0.07);
}

.ar h3 {
    font-size: 18px;
    color: #0b1e3a;
    margin-bottom: 8px;
}

.ar h3 a {
    color: #0066cc;
}

.ar p {
    color: #5e6f8d;
    font-size: 14px;
}

/* 常见问题 */
.fq {
    background: #fff;
    border: 1px solid #e8eef7;
    border-radius: 16px;
    padding: 24px 28px;
    margin-bottom: 16px;
}

.fq h3 {
    font-size: 17px;
    color: #0b1e3a;
    margin-bottom: 8px;
}

.fq p {
    color: #5e6f8d;
    font-size: 14px;
}

/* CTA */
.cta {
    background: linear-gradient(135deg, #0066cc, #0088ff);
    border-radius: 24px;
    padding: 60px 30px;
    text-align: center;
    color: #fff;
    box-shadow: 0 20px 50px rgba(0, 102, 204, 0.3);
}

.cta h3 {
    font-size: 30px;
    margin-bottom: 12px;
}

.cta p {
    margin-bottom: 28px;
    opacity: 0.9;
}

.cta a {
    display: inline-block;
    padding: 16px 44px;
    background: #fff;
    color: #0066cc;
    border-radius: 12px;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.15);
}

.cta a:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

/* 页脚 */
.ft {
    background: #0b1e3a;
    color: #a3b1c7;
    padding: 50px 0 30px;
    text-align: center;
    font-size: 14px;
}

.flk {
    display: flex;
    justify-content: center;
    gap: 28px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.flk a {
    color: #c9d6e8;
    transition: 0.2s;
}

.flk a:hover {
    color: #fff;
}

.ft p {
    margin-bottom: 6px;
}

/* 响应式 */
@media (max-width: 900px) {
    .g3,
    .g2,
    .row {
        grid-template-columns: 1fr;
    }
    .nums {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero h1 {
        font-size: 30px;
    }
    .hd .wrap {
        height: auto;
        flex-direction: column;
        padding: 14px 0;
        gap: 12px;
    }
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    .pic {
        font-size: 80px;
    }
}