:root {
    --ink: #15202b;
    --mute: #5d6b78;
    --paper: #eef3f7;
    --card: #ffffff;
    --line: #d4dee6;
    --eta: #0284c7;
    --ok: #059669;
    --track: #dbe7ef;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.65;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(1100px, calc(100% - 36px)); margin: 0 auto; }

.eta-strip {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 8px 16px;
    background: #e2ebf2;
    border-bottom: 1px solid var(--line);
    font-size: 11px;
    color: var(--mute);
    font-weight: 700;
}
.eta-strip .track {
    width: 180px;
    height: 6px;
    background: var(--track);
    border-radius: 99px;
    overflow: hidden;
}
.eta-strip .track i {
    display: block;
    width: 68%;
    height: 100%;
    background: var(--eta);
}
.eta-strip b { color: var(--eta); }

.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--card);
    border-bottom: 1px solid var(--line);
}
.nav-wrap {
    display: flex;
    align-items: center;
    gap: 16px;
    min-height: 66px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
}
.logo-mark {
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    background: var(--eta);
    color: #fff;
    border-radius: 6px;
    font-size: 13px;
}
.logo small { display: block; font-size: 10px; color: var(--mute); letter-spacing: 0.1em; }
.nav-toggle { display: none; }
.nav-burger {
    display: none;
    margin-left: auto;
    padding: 5px 10px;
    background: var(--eta);
    color: #fff;
    font-size: 12px;
    font-weight: 800;
}
.nav-menu { display: flex; gap: 14px; flex: 1; font-size: 13px; }
.nav-menu a { color: var(--mute); }
.nav-menu a.active, .nav-menu a:hover { color: var(--eta); font-weight: 700; }
.nav-actions { display: flex; gap: 8px; }

.btn {
    display: inline-block;
    padding: 8px 14px;
    background: var(--eta);
    color: #fff;
    font-weight: 800;
    font-size: 13px;
    border-radius: 6px;
}
.btn:hover { background: #0369a1; }
.btn-lg { padding: 12px 18px; }
.btn-ghost {
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--line);
}

.hero { padding: 42px 0 28px; }
.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 26px;
    align-items: center;
}
.hero-kicker {
    color: var(--eta);
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 10px;
}
.hero h1 {
    font-size: clamp(28px, 3.8vw, 40px);
    line-height: 1.18;
    margin-bottom: 12px;
}
.hero p { color: var(--mute); max-width: 40em; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.hero-visual {
    background: var(--card);
    border: 1px solid var(--line);
    padding: 16px;
    border-radius: 10px;
}
.eta-card {
    margin-bottom: 12px;
    font-size: 12px;
    color: var(--mute);
}
.eta-card .meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-weight: 800;
}
.eta-card .meta b { color: var(--eta); }
.eta-card .bar {
    height: 8px;
    background: var(--track);
    border-radius: 99px;
    overflow: hidden;
}
.eta-card .bar i {
    display: block;
    width: 72%;
    height: 100%;
    background: linear-gradient(90deg, var(--eta), var(--ok));
}
.hero-visual img { width: 100%; border-radius: 8px; }

.data-band { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.data-grid > div { padding: 20px 16px; border-right: 1px solid var(--line); }
.data-grid > div:last-child { border-right: 0; }
.data-num { font-size: 24px; font-weight: 800; color: var(--eta); }
.data-label { color: var(--mute); font-size: 12px; }

.section { padding: 44px 0; }
.section.alt { background: #e4edf3; }
.section-head { margin-bottom: 16px; }
.section-head h2 { font-size: 22px; margin-bottom: 6px; }
.section-head p { color: var(--mute); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.card {
    padding: 18px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
}
.card.main { border-color: var(--eta); }
.card h3 { margin: 8px 0; font-size: 16px; }
.card p { color: var(--mute); font-size: 14px; }
.icon {
    width: 36px;
    height: 6px;
    background: var(--track);
    border-radius: 99px;
    position: relative;
}
.icon::after {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 62%;
    height: 100%;
    background: var(--eta);
    border-radius: 99px;
}
.solution-card { padding: 0; overflow: hidden; }
.solution-card img { height: 150px; width: 100%; object-fit: cover; }
.solution-card div { padding: 14px 16px 16px; }
.price { color: var(--ok); font-weight: 800; margin-bottom: 6px; }

.cta {
    padding: 50px 0;
    text-align: center;
    background: var(--eta);
    color: #fff;
}
.cta h2 { font-size: 26px; margin-bottom: 8px; }
.cta p { color: #bae6fd; margin-bottom: 18px; }
.cta-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.cta .btn { background: #fff; color: var(--eta); }
.cta .btn-ghost { background: transparent; color: #fff; border-color: #7dd3fc; }

.site-footer {
    padding: 30px 0 16px;
    background: #0f1720;
    color: #dbe7ef;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 18px; }
.footer-grid h4 { color: #7dd3fc; margin-bottom: 8px; font-size: 12px; letter-spacing: 0.08em; }
.footer-grid a, .footer-grid p { display: block; color: #94a3b8; margin-bottom: 5px; font-size: 13px; }
.footer-bottom {
    margin-top: 16px;
    padding-top: 10px;
    border-top: 1px solid #243040;
    color: #64748b;
    font-size: 12px;
}

.page-hero { padding: 32px 0 6px; }
.page-hero h1 { font-size: 28px; margin: 8px 0; }
.page-hero p { color: var(--mute); max-width: 44em; }
.dl-list, .help-list { display: grid; gap: 10px; }
.dl-item, .help-box {
    padding: 18px 20px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
}
.dl-item { display: flex; justify-content: space-between; gap: 18px; align-items: center; }
.dl-item.main { border-color: var(--eta); }
.specs { display: flex; gap: 12px; color: var(--eta); font-size: 12px; margin: 6px 0; font-weight: 800; }
.shot { margin-top: 18px; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.shot img { width: 100%; }

@media (max-width: 900px) {
    .nav-burger { display: inline-block; }
    .nav-menu, .nav-actions { display: none; }
    .nav-toggle:checked ~ .nav-menu,
    .nav-toggle:checked ~ .nav-actions {
        display: flex;
        flex-direction: column;
        width: 100%;
        padding-bottom: 12px;
    }
    .nav-wrap { flex-wrap: wrap; }
    .hero-grid, .grid-3, .data-grid, .footer-grid, .dl-item { grid-template-columns: 1fr; display: grid; }
    .data-grid > div { border-right: 0; border-bottom: 1px solid var(--line); }
}