:root {
    --paper: #f5f8fb;
    --white: #ffffff;
    --ink: #1c2a36;
    --muted: #5a6b78;
    --line: #d5dee6;
    --ice: #e8f1f6;
    --lab: #2a6f8f;
    --lab-deep: #18485e;
    --mark: #3a8fb0;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "Segoe UI", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
    background: var(--paper);
    color: var(--ink);
    line-height: 1.75;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { width: min(1140px, calc(100% - 32px)); margin: 0 auto; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border: 1px solid var(--lab);
    background: var(--lab);
    color: #fff;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
}
.btn:hover { background: var(--lab-deep); }
.btn-ghost { background: #fff; color: var(--lab); }
.btn-ghost:hover { background: var(--ice); }
.btn-lg { padding: 13px 24px; font-size: 15px; }

.lab-bar {
    background: var(--ice);
    border-bottom: 1px solid var(--line);
    color: var(--lab-deep);
    font-size: 12px;
    letter-spacing: 0.06em;
    padding: 6px 0;
    text-align: center;
}

.site-nav {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--line);
}
.nav-wrap {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--lab-deep); }
.logo-mark {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--lab);
    display: grid;
    place-items: center;
    font-size: 14px;
    color: var(--lab);
    background: var(--ice);
}
.nav-menu { display: flex; gap: 16px; flex-wrap: wrap; }
.nav-menu a { font-size: 14px; color: var(--muted); }
.nav-menu a:hover, .nav-menu a.active { color: var(--lab); }
.nav-actions { display: flex; gap: 8px; }
.nav-toggle { display: none; }
.nav-burger {
    display: none;
    border: 1px solid var(--line);
    padding: 7px 10px;
    color: var(--lab);
    font-size: 13px;
}

.hero { padding: 52px 0 36px; background: linear-gradient(180deg, #fff 0%, var(--paper) 100%); }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
.record {
    display: inline-block;
    background: var(--ice);
    color: var(--lab);
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 3px;
    margin-bottom: 12px;
}
.hero h1 { font-size: clamp(28px, 4vw, 44px); line-height: 1.25; margin-bottom: 12px; font-weight: 650; }
.hero-kicker { color: var(--lab); font-size: 14px; margin-bottom: 8px; }
.hero p { color: var(--muted); margin-bottom: 18px; }
.lab-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 16px;
}
.meta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 10px; font-size: 12px; color: var(--muted); }
.hero-visual img { width: 100%; border: 1px solid var(--line); border-radius: 6px; background: #fff; }

.data-band { background: #fff; border-block: 1px solid var(--line); padding: 24px 0; }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; text-align: center; }
.data-num { font-size: 28px; font-weight: 700; color: var(--lab-deep); font-variant-numeric: tabular-nums; }
.data-label { font-size: 13px; color: var(--muted); }

.section { padding: 68px 0; }
.section.alt { background: #fff; }
.section-head { text-align: center; margin-bottom: 28px; }
.section-head h2 { font-size: 26px; margin-bottom: 8px; font-weight: 650; }
.section-head p { color: var(--muted); }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 18px;
}
.card h3 { margin: 8px 0; font-size: 17px; }
.card p { color: var(--muted); font-size: 14px; }
.icon { color: var(--lab); font-size: 18px; font-family: Consolas, monospace; }
.solution-card { padding: 0; overflow: hidden; }
.solution-card img { height: 168px; width: 100%; object-fit: cover; }
.solution-card div { padding: 16px; }
.price { font-size: 22px; color: var(--lab); font-weight: 700; margin: 6px 0 8px; }
.card.main { outline: 1px solid var(--lab); }

.cta { padding: 60px 0; text-align: center; background: var(--ice); }
.cta h2 { font-size: 28px; margin-bottom: 8px; }
.cta p { color: var(--muted); margin-bottom: 18px; }
.cta-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

.site-footer { background: #13202a; color: #b8c6d0; padding: 40px 0 16px; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 18px; margin-bottom: 16px; }
.footer-grid h4 { color: #e8f1f6; margin-bottom: 8px; font-size: 14px; }
.footer-grid a, .footer-grid p { display: block; margin-bottom: 7px; font-size: 13px; color: #b8c6d0; }
.logo-light { color: #fff; }
.footer-bottom { border-top: 1px solid #2a3c4a; padding-top: 12px; text-align: center; font-size: 12px; }

.page-hero { padding: 36px 0 6px; text-align: center; }
.page-hero h1 { font-size: 30px; margin-bottom: 8px; }
.page-hero p { color: var(--muted); }

.dl-list { display: grid; gap: 12px; }
.dl-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 18px;
}
.dl-item.main { border-color: var(--lab); }
.specs { display: flex; gap: 6px; flex-wrap: wrap; margin: 8px 0; font-size: 12px; color: var(--muted); }
.specs span { background: var(--ice); padding: 2px 7px; border-radius: 3px; }
.shot { max-width: 840px; margin: 24px auto 0; }
.shot img { border: 1px solid var(--line); border-radius: 6px; }

.help-list { display: grid; gap: 12px; max-width: 840px; margin: 0 auto; }
.help-box { background: #fff; border: 1px solid var(--line); border-radius: 6px; padding: 20px; }
.help-box h3 { color: var(--lab-deep); margin-bottom: 8px; font-size: 17px; }
.help-box p { color: var(--muted); margin-bottom: 8px; font-size: 14px; }

@media (max-width: 992px) {
    .nav-burger { display: inline-block; }
    .nav-toggle:checked + .nav-burger + .nav-menu { display: flex; }
    .nav-menu {
        display: none;
        position: absolute;
        left: 16px;
        right: 16px;
        top: 112px;
        background: #fff;
        border: 1px solid var(--line);
        padding: 12px;
        flex-direction: column;
    }
    .hero-grid, .grid-3, .footer-grid { grid-template-columns: 1fr; }
    .data-grid { grid-template-columns: 1fr 1fr; }
    .dl-item { flex-direction: column; text-align: center; }
    .nav-actions .btn-ghost { display: none; }
}