:root {
    --steel: #8d949c;
    --gun: #2c3138;
    --ink: #e7ebf0;
    --mute: #9aa3ad;
    --chrome: #c5ccd4;
    --accent: #c9a227;
}

* { 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:
        repeating-linear-gradient(90deg, #2a2f35 0 1px, #32383f 1px 3px, #262b31 3px 4px),
        #2c3138;
    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; }

.brush-bar {
    height: 12px;
    background: repeating-linear-gradient(90deg, #9aa3ad 0 2px, #6f777f 2px 3px, #c5ccd4 3px 5px, #5c646c 5px 6px);
}

.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: linear-gradient(180deg, #3a4048, #24292f);
    border-bottom: 1px solid #181c20;
    box-shadow: 0 6px 0 rgba(0,0,0,0.25);
}
.nav-wrap {
    display: flex;
    align-items: center;
    gap: 16px;
    min-height: 68px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    letter-spacing: 0.04em;
}
.logo-mark {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    background: repeating-linear-gradient(90deg, #d4dbe2 0 2px, #9aa3ad 2px 3px, #eceff2 3px 5px);
    color: #2c3138;
    box-shadow: inset 0 1px 0 #fff, 0 2px 0 #181c20;
}
.logo small { display: block; font-size: 10px; color: var(--mute); letter-spacing: 0.16em; }
.nav-toggle { display: none; }
.nav-burger {
    display: none;
    margin-left: auto;
    padding: 5px 12px;
    background: repeating-linear-gradient(90deg, #c5ccd4 0 2px, #8d949c 2px 3px);
    color: #2c3138;
    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(--accent); }
.nav-actions { display: flex; gap: 8px; }

.btn {
    display: inline-block;
    padding: 8px 16px;
    color: #1d2126;
    font-weight: 800;
    font-size: 13px;
    background: repeating-linear-gradient(90deg, #dfe4ea 0 2px, #a7b0b8 2px 3px, #eceff3 3px 5px);
    box-shadow: inset 0 1px 0 #fff, inset 0 -2px 0 #7b838c, 0 3px 0 #181c20;
}
.btn:hover { filter: brightness(1.06); }
.btn-lg { padding: 12px 20px; }
.btn-ghost {
    background: linear-gradient(180deg, #3a4048, #24292f);
    color: var(--ink);
    box-shadow: inset 0 1px 0 #5a616a, 0 3px 0 #181c20;
}

.hero { padding: 46px 0 32px; }
.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 26px;
    align-items: center;
}
.hero-kicker {
    color: var(--accent);
    letter-spacing: 0.08em;
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 10px;
}
.hero h1 {
    font-size: clamp(28px, 4vw, 42px);
    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: 20px; }
.hero-visual {
    padding: 8px;
    background: linear-gradient(180deg, #3a4048, #24292f);
    box-shadow: inset 0 1px 0 #5a616a, 0 8px 0 #181c20;
}
.hero-visual img { width: 100%; }

.data-band { background: #1d2126; }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.data-grid > div {
    padding: 20px 16px;
    border-right: 1px solid #3a4048;
}
.data-grid > div:last-child { border-right: 0; }
.data-num { font-size: 24px; font-weight: 800; color: var(--accent); }
.data-label { color: var(--mute); font-size: 12px; }

.section { padding: 46px 0; }
.section.alt { background: rgba(29,33,38,0.55); }
.section-head { margin-bottom: 18px; }
.section-head h2 { font-size: 24px; 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: linear-gradient(180deg, #3a4048, #2a3037);
    box-shadow: inset 0 1px 0 #5a616a, 0 6px 0 #181c20;
}
.card.main { outline: 1px solid var(--accent); }
.card h3 { margin: 8px 0; font-size: 17px; }
.card p { color: var(--mute); font-size: 14px; }
.icon {
    width: 28px;
    height: 10px;
    background: repeating-linear-gradient(90deg, #dfe4ea 0 2px, #a7b0b8 2px 3px);
    box-shadow: 0 2px 0 #181c20;
}
.solution-card { padding: 8px 8px 16px; }
.solution-card img { height: 150px; width: 100%; object-fit: cover; }
.solution-card div { padding: 10px 8px 0; }
.price { color: var(--accent); font-weight: 800; margin-bottom: 6px; }

.cta {
    padding: 52px 0;
    text-align: center;
    background: linear-gradient(180deg, #3a4048, #1d2126);
}
.cta h2 { font-size: 26px; margin-bottom: 8px; }
.cta p { color: var(--mute); margin-bottom: 18px; }
.cta-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }

.site-footer {
    padding: 32px 0 16px;
    background: #1d2126;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 20px; }
.footer-grid h4 { color: var(--accent); margin-bottom: 8px; font-size: 12px; letter-spacing: 0.1em; }
.footer-grid a, .footer-grid p { display: block; color: var(--mute); margin-bottom: 5px; font-size: 13px; }
.footer-bottom {
    margin-top: 18px;
    padding-top: 10px;
    border-top: 1px solid #3a4048;
    color: #7b838c;
    font-size: 12px;
}

.page-hero { padding: 36px 0 8px; }
.page-hero h1 { font-size: 30px; 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: linear-gradient(180deg, #3a4048, #2a3037);
    box-shadow: inset 0 1px 0 #5a616a, 0 6px 0 #181c20;
}
.dl-item { display: flex; justify-content: space-between; gap: 18px; align-items: center; }
.dl-item.main { outline: 1px solid var(--accent); }
.specs { display: flex; gap: 12px; color: var(--accent); font-size: 12px; margin: 6px 0; font-weight: 800; }
.shot {
    margin-top: 20px;
    padding: 8px;
    background: linear-gradient(180deg, #3a4048, #24292f);
    box-shadow: 0 8px 0 #181c20;
}
.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: 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: 1px solid #3a4048; }
}