:root {
    --grid: #d7dde4;
    --ink: #1c2430;
    --mute: #5b6776;
    --cell: #f7f9fb;
    --head: #243044;
    --warn: #e08a1a;
    --ok: #2a8f5a;
    --bar: #3d6ea8;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: "IBM Plex Sans", "Segoe UI", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background: #eef2f6;
    line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }

.cap-ruler {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    height: 8px;
    background: var(--head);
}
.cap-ruler span { border-right: 1px solid #3d4f66; }
.cap-ruler span:nth-child(3n) { background: var(--warn); }
.cap-ruler span:nth-child(4n) { background: var(--ok); }

.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: #fff;
    border-bottom: 1px solid var(--grid);
}
.nav-wrap {
    display: flex;
    align-items: center;
    gap: 14px;
    min-height: 64px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    letter-spacing: 0.02em;
    font-family: "IBM Plex Mono", "Consolas", monospace;
}
.logo-mark {
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    background: var(--head);
    color: #fff;
    font-size: 12px;
}
.logo small { display: block; font-size: 10px; color: var(--mute); letter-spacing: 0.12em; font-weight: 500; }
.nav-toggle { display: none; }
.nav-burger {
    display: none;
    margin-left: auto;
    padding: 4px 10px;
    background: var(--head);
    color: #fff;
    font-size: 11px;
    font-family: "IBM Plex Mono", Consolas, monospace;
}
.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(--ink); border-bottom: 2px solid var(--warn); }
.nav-actions { display: flex; gap: 8px; }

.btn {
    display: inline-block;
    padding: 8px 14px;
    background: var(--head);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
}
.btn:hover { background: #31405a; }
.btn-lg { padding: 11px 18px; }
.btn-ghost {
    background: #fff;
    color: var(--ink);
    border: 1px solid var(--grid);
}

.hero { padding: 40px 0 28px; }
.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 24px;
    align-items: center;
}
.hero-kicker {
    font-family: "IBM Plex Mono", Consolas, monospace;
    color: var(--bar);
    font-size: 11px;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}
.hero h1 {
    font-size: clamp(28px, 3.8vw, 40px);
    line-height: 1.2;
    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 {
    border: 1px solid var(--grid);
    background: #fff;
}
.hero-visual img { width: 100%; }
.sheet-head {
    display: grid;
    grid-template-columns: 36px repeat(4, 1fr);
    background: var(--head);
    color: #d7e0ea;
    font-size: 11px;
    font-family: "IBM Plex Mono", Consolas, monospace;
}
.sheet-head b, .sheet-head span { padding: 6px 8px; border-right: 1px solid #3d4f66; }

.data-band { background: #fff; border-top: 1px solid var(--grid); border-bottom: 1px solid var(--grid); }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.data-grid > div {
    padding: 18px 16px;
    border-right: 1px solid var(--grid);
}
.data-grid > div:last-child { border-right: 0; }
.data-num {
    font-family: "IBM Plex Mono", Consolas, monospace;
    font-size: 22px;
    font-weight: 700;
}
.data-label { color: var(--mute); font-size: 12px; }
.meter {
    height: 4px;
    background: #e4e9ef;
    margin-top: 8px;
}
.meter i { display: block; height: 100%; background: var(--ok); }
.meter.warn i { background: var(--warn); width: 72%; }
.meter.mid i { background: var(--bar); width: 58%; }

.section { padding: 44px 0; }
.section.alt { background: #fff; }
.section-head { margin-bottom: 16px; display: flex; justify-content: space-between; align-items: end; gap: 16px; }
.section-head h2 { font-size: 22px; }
.section-head p { color: var(--mute); font-size: 14px; }
.section-head small {
    font-family: "IBM Plex Mono", Consolas, monospace;
    color: var(--bar);
    font-size: 11px;
}
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--grid); border: 1px solid var(--grid); }
.card {
    padding: 18px;
    background: var(--cell);
}
.card.main { background: #fff8ec; }
.card h3 { margin: 6px 0; font-size: 16px; }
.card p { color: var(--mute); font-size: 14px; }
.icon {
    width: 100%;
    height: 6px;
    background: #e4e9ef;
    position: relative;
}
.icon::after {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 42%;
    background: var(--bar);
}
.card:nth-child(2) .icon::after { width: 68%; background: var(--ok); }
.card:nth-child(3) .icon::after { width: 54%; background: var(--warn); }
.card:nth-child(4) .icon::after { width: 77%; }
.card:nth-child(5) .icon::after { width: 33%; background: var(--ok); }
.card:nth-child(6) .icon::after { width: 61%; }
.solution-card { padding: 0; }
.solution-card img { height: 150px; width: 100%; object-fit: cover; }
.solution-card div { padding: 14px 16px 16px; }
.price {
    font-family: "IBM Plex Mono", Consolas, monospace;
    color: var(--bar);
    margin-bottom: 6px;
    font-size: 13px;
}

.cta {
    padding: 48px 0;
    text-align: center;
    background: var(--head);
    color: #fff;
}
.cta h2 { font-size: 26px; margin-bottom: 8px; }
.cta p { color: #b8c4d2; margin-bottom: 18px; }
.cta-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.cta .btn { background: var(--warn); color: #1c2430; }
.cta .btn-ghost { background: transparent; color: #fff; border-color: #4a5b70; }

.site-footer {
    padding: 30px 0 16px;
    background: #fff;
    border-top: 1px solid var(--grid);
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 18px; }
.footer-grid h4 {
    font-family: "IBM Plex Mono", Consolas, monospace;
    color: var(--bar);
    margin-bottom: 8px;
    font-size: 11px;
    letter-spacing: 0.08em;
}
.footer-grid a, .footer-grid p { display: block; color: var(--mute); margin-bottom: 5px; font-size: 13px; }
.footer-bottom {
    margin-top: 16px;
    padding-top: 10px;
    border-top: 1px solid var(--grid);
    color: #8894a3;
    font-size: 12px;
    font-family: "IBM Plex Mono", Consolas, monospace;
}

.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: 1px; background: var(--grid); border: 1px solid var(--grid); }
.dl-item, .help-box {
    padding: 18px 20px;
    background: #fff;
}
.dl-item { display: flex; justify-content: space-between; gap: 18px; align-items: center; }
.dl-item.main { background: #fff8ec; }
.specs {
    display: flex;
    gap: 12px;
    color: var(--bar);
    font-size: 12px;
    margin: 6px 0;
    font-family: "IBM Plex Mono", Consolas, monospace;
}
.shot { margin-top: 18px; border: 1px solid var(--grid); }
.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, .section-head { grid-template-columns: 1fr; display: grid; }
    .data-grid > div { border-right: 0; border-bottom: 1px solid var(--grid); }
}