:root {
    --d-primary: #006EFF;
    --d-primary-hover: #0052D9;
    --d-primary-bg: #ECF2FE;
    --d-text: #1D2129;
    --d-text-2: #4E5969;
    --d-text-3: #86909C;
    --d-border: #E5E6EB;
    --d-bg: #FFFFFF;
    --d-bg-page: #F5F7FA;
    --d-radius: 6px;
    --d-shadow: 0 2px 10px rgba(29, 33, 41, .06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body { font-size: 14px; }

.dft-body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--d-text);
    background: var(--d-bg);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.dft-body a { text-decoration: none; color: inherit; }
.dft-body img { vertical-align: middle; }
.dft-body button { font-family: inherit; }

.dft-inner { max-width: 1120px; margin: 0 auto; padding: 0 24px; width: 100%; }


.dft-topbar {
    background: var(--d-bg);
    border-bottom: 1px solid var(--d-border);
    position: sticky;
    top: 0;
    z-index: 20;
}

.dft-topbar-inner {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.dft-brand { display: inline-flex; align-items: center; gap: 10px; }
.dft-brand img { width: 30px; height: 30px; }
.dft-brand span { font-size: 16px; font-weight: 600; color: var(--d-text); }

.dft-topnav { display: flex; align-items: center; gap: 8px; }

.dft-topnav a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--d-radius);
    font-size: 14px;
    color: var(--d-text-2);
    transition: background .15s, color .15s;
}

.dft-topnav a img { width: 16px; height: 16px; }
.dft-topnav a:hover { background: var(--d-primary-bg); color: var(--d-primary); }


.dft-main { flex: 1; }

.dft-hero {
    display: flex;
    align-items: center;
    gap: 48px;
    padding: 72px 0 64px;
}

.dft-hero-text { flex: 1; min-width: 0; }

.dft-hero-text h1 {
    font-size: 38px;
    line-height: 50px;
    font-weight: 600;
    color: var(--d-text);
    text-align: left;
}

.dft-dot { color: var(--d-primary); margin: 0 6px; }

.dft-hero-text p {
    margin-top: 18px;
    font-size: 15px;
    line-height: 27px;
    color: var(--d-text-2);
    max-width: 520px;
}

.dft-hero-entry { margin-top: 28px; display: flex; gap: 14px; }

.dft-btn {
    display: inline-block;
    padding: 10px 26px;
    border-radius: var(--d-radius);
    font-size: 14px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background .15s, color .15s, border-color .15s;
}

.dft-btn-primary { background: var(--d-primary); color: #FFFFFF; }
.dft-btn-primary:hover { background: var(--d-primary-hover); }

.dft-btn-plain { background: var(--d-bg); color: var(--d-primary); border-color: var(--d-primary); }
.dft-btn-plain:hover { background: var(--d-primary-bg); }


.dft-query-card {
    flex: 0 0 420px;
    background: var(--d-bg);
    border: 1px solid var(--d-border);
    border-radius: var(--d-radius);
    box-shadow: var(--d-shadow);
    padding: 24px;
}

.dft-query-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 600;
    color: var(--d-text);
}

.dft-query-title img { width: 18px; height: 18px; }

.dft-query-desc { margin-top: 10px; font-size: 13px; line-height: 21px; color: var(--d-text-3); }

.dft-query-form { margin-top: 16px; display: flex; }

.dft-query-input {
    flex: 1;
    min-width: 0;
    height: 40px;
    padding: 0 12px;
    border: 1px solid var(--d-border);
    border-right: none;
    border-radius: var(--d-radius) 0 0 var(--d-radius);
    font-size: 14px;
    font-family: inherit;
    color: var(--d-text);
    outline: none;
    background: var(--d-bg);
    transition: border-color .15s, box-shadow .15s;
}

.dft-query-input:focus { border-color: var(--d-primary); box-shadow: 0 0 0 3px rgba(0, 110, 255, .12); }

.dft-query-btn {
    height: 40px;
    padding: 0 22px;
    background: var(--d-primary);
    border: none;
    border-radius: 0 var(--d-radius) var(--d-radius) 0;
    font-size: 14px;
    color: #FFFFFF;
    cursor: pointer;
    transition: background .15s;
}

.dft-query-btn:hover { background: var(--d-primary-hover); }

.dft-query-result { margin-top: 14px; }

.dft-result {
    display: flex;
    gap: 10px;
    padding: 12px 14px;
    border-radius: var(--d-radius);
    border: 1px solid var(--d-border);
    background: var(--d-bg-page);
}

.dft-result img { width: 20px; height: 20px; flex: none; margin-top: 1px; }
.dft-r-main { font-size: 14px; font-weight: 500; color: var(--d-text); }
.dft-r-sub { margin-top: 4px; font-size: 13px; line-height: 20px; color: var(--d-text-2); }

.dft-result-ok { border-color: #B7EB8F; background: #FCFFE6; }
.dft-result-warn { border-color: #FFDF8C; background: #FFF7E8; }
.dft-result-bad { border-color: #FDCDC5; background: #FFF0EC; }


.dft-features { padding: 24px 0 72px; }

.dft-sec-title { font-size: 26px; font-weight: 600; color: var(--d-text); text-align: left; }
.dft-sec-sub { margin-top: 8px; font-size: 14px; color: var(--d-text-3); }

.dft-feature-grid {
    margin-top: 32px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.dft-feature-card {
    background: var(--d-bg);
    border: 1px solid var(--d-border);
    border-radius: var(--d-radius);
    padding: 24px 20px;
    transition: box-shadow .2s, transform .2s, border-color .2s;
}

.dft-feature-card:hover {
    box-shadow: var(--d-shadow);
    border-color: var(--d-primary-bg);
    transform: translateY(-2px);
}

.dft-feature-card img { width: 34px; height: 34px; }
.dft-feature-card h3 { margin-top: 14px; font-size: 16px; font-weight: 600; color: var(--d-text); }
.dft-feature-card p { margin-top: 8px; font-size: 13px; line-height: 22px; color: var(--d-text-2); }


/* 软件下载 */
.dft-download { padding: 8px 0 72px; }
.dft-dl-card {
    margin-top: 32px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 230px;
    gap: 32px;
    align-items: center;
    background: var(--d-bg);
    border: 1px solid var(--d-border);
    border-radius: var(--d-radius);
    box-shadow: var(--d-shadow);
    padding: 28px 30px;
}
.dft-dl-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 20px; }
.dft-dl-row { display: flex; flex-direction: column; gap: 8px; }
.dft-dl-label { font-size: 13px; font-weight: 600; color: var(--d-text-2); }
.dft-dl-input, .dft-dl-select {
    height: 44px;
    padding: 0 14px;
    border: 1px solid var(--d-border);
    border-radius: var(--d-radius);
    font-size: 14px;
    color: var(--d-text);
    background: var(--d-bg);
    appearance: none;
    -webkit-appearance: none;
    transition: border-color .15s, box-shadow .15s;
}
.dft-dl-input::placeholder { color: var(--d-text-3); }
.dft-dl-input:focus, .dft-dl-select:focus {
    outline: none;
    border-color: var(--d-primary);
    box-shadow: 0 0 0 3px rgba(0, 110, 255, .12);
}
.dft-dl-cap { display: flex; gap: 12px; align-items: center; }
.dft-dl-cap .dft-dl-input { flex: 1; }
.dft-dl-cap-img { height: 44px; width: 126px; border: 1px solid var(--d-border); border-radius: var(--d-radius); cursor: pointer; }
.dft-dl-btn { height: 46px; margin-top: 4px; justify-self: start; padding: 0 38px; }
.dft-dl-points { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.dft-dl-points li {
    display: flex; align-items: center; gap: 9px;
    font-size: 13px; color: var(--d-text-2); line-height: 1.6;
}
.dft-dl-points img { width: 16px; height: 16px; flex: none; }

/* 授权产品展示 */
.dft-apps { padding: 8px 0 72px; }

.dft-app-grid {
    margin-top: 32px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.dft-app-card {
    display: flex;
    flex-direction: column;
    background: var(--d-bg);
    border: 1px solid var(--d-border);
    border-radius: var(--d-radius);
    padding: 24px 20px;
    text-decoration: none;
    transition: box-shadow .2s, transform .2s, border-color .2s;
}
.dft-app-card:hover {
    box-shadow: var(--d-shadow);
    border-color: var(--d-primary-bg);
    transform: translateY(-2px);
}

.dft-app-icon { width: 40px; height: 40px; object-fit: contain; }
.dft-app-card h3 { margin-top: 14px; font-size: 16px; font-weight: 600; color: var(--d-text); }
.dft-app-tags { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px; }
.dft-app-tag {
    padding: 2px 10px;
    border-radius: 4px;
    background: var(--d-primary-bg);
    color: var(--d-primary);
    font-size: 12px;
    line-height: 20px;
}
.dft-app-card p {
    margin-top: 8px;
    font-size: 13px;
    line-height: 22px;
    color: var(--d-text-2);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}


.dft-footer {
    border-top: 1px solid var(--d-border);
    background: var(--d-bg);
    padding: 18px 0;
}

.dft-footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px 18px;
    font-size: 13px;
    color: var(--d-text-3);
}

.dft-foot-contacts { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 18px; }
.dft-foot-contacts a { color: var(--d-text-3); transition: color .15s; }
.dft-foot-contacts a:hover { color: var(--d-primary); }


@media (max-width: 960px) {
    .dft-hero { flex-direction: column; align-items: stretch; gap: 32px; padding: 40px 0; }
    .dft-hero-text h1 { font-size: 28px; line-height: 40px; }
    .dft-query-card { flex: none; }
    .dft-feature-grid { grid-template-columns: repeat(2, 1fr); }
    .dft-app-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
    .dft-feature-grid { grid-template-columns: 1fr; }
    .dft-app-grid { grid-template-columns: 1fr; }
    .dft-dl-card { grid-template-columns: 1fr; gap: 24px; padding: 22px 18px; }
    .dft-dl-form { grid-template-columns: 1fr; }
    .dft-dl-btn { width: 100%; justify-self: stretch; }
    .dft-topnav a span { display: none; }
    .dft-topnav a { padding: 8px 10px; }
}