:root {
    --slab: #8d8a84;
    --cast: #6f6c66;
    --core: #2c2b28;
    --ink: #1a1917;
    --mute: #5c5a55;
    --mark: #d4a017;
    --dust: #cfc9bf;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: "Arial Black", "Impact", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background-color: #b7b3ab;
    background-image:
        repeating-linear-gradient(90deg, transparent, transparent 79px, rgba(44,43,40,0.08) 80px),
        repeating-linear-gradient(0deg, transparent, transparent 79px, rgba(44,43,40,0.08) 80px),
        radial-gradient(circle at 18% 22%, rgba(0,0,0,0.08) 0 1px, transparent 2px),
        radial-gradient(circle at 72% 61%, rgba(255,255,255,0.12) 0 1px, transparent 2px);
    line-height: 1.55;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 28px)); margin: 0 auto; }

.formwork {
    height: 18px;
    background: var(--core);
    border-bottom: 8px solid var(--mark);
}

.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--core);
    color: #e8e4dc;
}
.nav-wrap {
    display: flex;
    align-items: center;
    gap: 14px;
    min-height: 72px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 900;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}
.logo-mark {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    background: var(--mark);
    color: #1a1917;
}
.logo small { display: block; font-size: 10px; color: #b7b3ab; letter-spacing: 0.16em; font-weight: 400; }
.nav-toggle { display: none; }
.nav-burger {
    display: none;
    margin-left: auto;
    padding: 6px 12px;
    background: var(--mark);
    color: #1a1917;
    font-size: 12px;
    font-weight: 900;
}
.nav-menu { display: flex; gap: 12px; flex: 1; font-size: 13px; font-weight: 700; }
.nav-menu a { color: #cfc9bf; }
.nav-menu a.active, .nav-menu a:hover { color: var(--mark); }
.nav-actions { display: flex; gap: 8px; }

.btn {
    display: inline-block;
    padding: 10px 16px;
    background: var(--mark);
    color: #1a1917;
    font-weight: 900;
    font-size: 13px;
    letter-spacing: 0.04em;
}
.btn:hover { background: #e8b423; }
.btn-lg { padding: 13px 20px; }
.btn-ghost {
    background: transparent;
    color: #e8e4dc;
    border: 3px solid #6f6c66;
}

.hero { padding: 44px 0 28px; }
.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 20px;
    align-items: stretch;
}
.hero-kicker {
    color: var(--core);
    background: var(--mark);
    display: inline-block;
    padding: 3px 8px;
    font-size: 12px;
    font-weight: 900;
    margin-bottom: 12px;
}
.hero h1 {
    font-size: clamp(30px, 4.4vw, 46px);
    line-height: 1.08;
    font-weight: 900;
    text-transform: uppercase;
    margin-bottom: 14px;
}
.hero p { color: var(--mute); max-width: 40em; font-family: "Arial", "Microsoft YaHei", sans-serif; font-weight: 400; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.hero .btn-ghost { color: var(--ink); border-color: var(--core); }
.hero-visual {
    background: var(--cast);
    padding: 10px;
    box-shadow: 12px 12px 0 var(--core);
}
.hero-visual img { width: 100%; filter: contrast(1.05) grayscale(0.15); }

.data-band { background: var(--core); color: #e8e4dc; }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.data-grid > div {
    padding: 22px 16px;
    border-right: 4px solid var(--mark);
}
.data-grid > div:last-child { border-right: 0; }
.data-num { font-size: 26px; font-weight: 900; color: var(--mark); }
.data-label { color: #b7b3ab; font-size: 12px; font-weight: 700; letter-spacing: 0.08em; }

.section { padding: 44px 0; }
.section.alt { background: #a8a49c; }
.section-head { margin-bottom: 16px; border-left: 12px solid var(--core); padding-left: 12px; }
.section-head h2 { font-size: 26px; font-weight: 900; text-transform: uppercase; margin-bottom: 6px; }
.section-head p { color: var(--mute); font-family: "Arial", "Microsoft YaHei", sans-serif; font-weight: 400; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.card {
    padding: 18px;
    background: #cfc9bf;
    border-top: 8px solid var(--core);
    font-family: "Arial", "Microsoft YaHei", sans-serif;
    font-weight: 400;
}
.card.main { border-top-color: var(--mark); background: #ddd7cb; }
.card h3 { margin: 8px 0; font-size: 18px; font-family: "Arial Black", "Microsoft YaHei", sans-serif; font-weight: 900; }
.card p { color: var(--mute); font-size: 14px; }
.icon {
    width: 36px;
    height: 10px;
    background: var(--core);
}
.card.main .icon { background: var(--mark); }
.solution-card { padding: 0; }
.solution-card img { height: 150px; width: 100%; object-fit: cover; filter: grayscale(0.25) contrast(1.08); }
.solution-card div { padding: 14px 16px 16px; }
.price { color: var(--core); font-weight: 900; margin-bottom: 6px; font-family: "Arial Black", sans-serif; }

.cta {
    padding: 52px 0;
    text-align: center;
    background: var(--mark);
    color: #1a1917;
}
.cta h2 { font-size: 28px; font-weight: 900; text-transform: uppercase; margin-bottom: 8px; }
.cta p { margin-bottom: 18px; font-family: "Arial", "Microsoft YaHei", sans-serif; font-weight: 400; }
.cta-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.cta .btn { background: var(--core); color: #e8e4dc; }
.cta .btn-ghost { background: transparent; color: #1a1917; border-color: #1a1917; }

.site-footer {
    padding: 32px 0 16px;
    background: var(--core);
    color: #cfc9bf;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 18px; }
.footer-grid h4 { color: var(--mark); margin-bottom: 8px; font-size: 12px; letter-spacing: 0.12em; }
.footer-grid a, .footer-grid p {
    display: block;
    color: #b7b3ab;
    margin-bottom: 5px;
    font-size: 13px;
    font-family: "Arial", "Microsoft YaHei", sans-serif;
    font-weight: 400;
}
.footer-bottom {
    margin-top: 16px;
    padding-top: 10px;
    border-top: 8px solid var(--mark);
    color: #8d8a84;
    font-size: 12px;
    font-family: "Arial", sans-serif;
}

.page-hero { padding: 32px 0 6px; }
.page-hero h1 { font-size: 32px; font-weight: 900; text-transform: uppercase; margin: 8px 0; }
.page-hero p { color: var(--mute); max-width: 44em; font-family: "Arial", "Microsoft YaHei", sans-serif; font-weight: 400; }
.dl-list, .help-list { display: grid; gap: 8px; }
.dl-item, .help-box {
    padding: 18px 20px;
    background: #cfc9bf;
    border-left: 12px solid var(--core);
    font-family: "Arial", "Microsoft YaHei", sans-serif;
    font-weight: 400;
}
.dl-item { display: flex; justify-content: space-between; gap: 18px; align-items: center; }
.dl-item.main { border-left-color: var(--mark); }
.specs { display: flex; gap: 12px; color: var(--core); font-size: 12px; margin: 6px 0; font-weight: 900; font-family: "Arial Black", sans-serif; }
.shot { margin-top: 18px; box-shadow: 10px 10px 0 var(--core); }
.shot img { width: 100%; filter: grayscale(0.2) contrast(1.06); }

@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: 14px;
    }
    .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: 4px solid var(--mark); }
}