:root {
    --ink: #1e2430;
    --paper: #f3f5f8;
    --cell: #ffffff;
    --mute: #667085;
    --line: #d5dbe6;
    --a: #3d7aed;
    --b: #2bb673;
    --c: #f0a202;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
    color: var(--ink);
    background:
        linear-gradient(var(--line) 1px, transparent 1px),
        linear-gradient(90deg, var(--line) 1px, transparent 1px),
        var(--paper);
    background-size: 28px 28px;
    line-height: 1.7;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(1100px, calc(100% - 40px)); margin: 0 auto; }

.grid-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 24px;
    letter-spacing: 0.24em;
    font-size: 11px;
    color: var(--a);
    background: #fff;
    border-bottom: 1px solid var(--line);
}
.grid-bar b {
    display: inline-block;
    width: 10px;
    height: 10px;
    margin: 0 2px;
    background: var(--ink);
}
.grid-bar b:nth-child(2) { transform: translate(2px, -2px); background: var(--a); }
.grid-bar b:nth-child(3) { transform: translate(-1px, 2px); background: var(--b); }

.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--line);
}
.nav-wrap {
    display: flex;
    align-items: center;
    gap: 18px;
    min-height: 72px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    letter-spacing: 0.06em;
}
.logo-mark {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    background: var(--ink);
    color: #fff;
    transform: rotate(-4deg);
}
.nav-toggle { display: none; }
.nav-burger {
    display: none;
    margin-left: auto;
    padding: 6px 10px;
    border: 1px solid var(--ink);
    font-size: 13px;
}
.nav-menu { display: flex; gap: 18px; flex: 1; font-size: 14px; }
.nav-menu a { color: var(--mute); }
.nav-menu a.active, .nav-menu a:hover { color: var(--a); }
.nav-actions { display: flex; gap: 10px; }

.btn {
    display: inline-block;
    padding: 10px 18px;
    background: var(--ink);
    color: #fff;
    letter-spacing: 0.04em;
}
.btn:hover { background: var(--a); }
.btn-lg { padding: 14px 26px; }
.btn-ghost {
    background: #fff;
    color: var(--ink);
    border: 1px solid var(--ink);
}

.hero { padding: 68px 0 76px; }
.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 36px;
    align-items: center;
}
.tag {
    display: inline-block;
    margin-bottom: 12px;
    color: var(--a);
    letter-spacing: 0.18em;
    font-size: 12px;
}
.hero-kicker { margin-bottom: 8px; color: var(--mute); }
.hero h1 {
    font-size: clamp(30px, 4.2vw, 48px);
    line-height: 1.22;
    margin-bottom: 16px;
}
.hero p { color: var(--mute); max-width: 36em; }
.jitter {
    margin-top: 26px;
    display: inline-block;
    padding: 18px 20px;
    background: #fff;
    border: 1px solid var(--line);
    transform: rotate(-0.6deg);
    box-shadow: 6px 8px 0 rgba(61, 122, 237, 0.12);
}
.meta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 14px;
    color: var(--mute);
    font-size: 13px;
}
.hero-visual img {
    width: 100%;
    transform: rotate(1.2deg);
    border: 1px solid var(--line);
    background: #fff;
}

.data-band {
    padding: 30px 0;
    background: #fff;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}
.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    text-align: center;
}
.data-grid > div:nth-child(2) { transform: translateY(-4px); }
.data-grid > div:nth-child(3) { transform: translateY(5px); }
.data-num { font-size: 28px; }
.data-label { color: var(--mute); font-size: 13px; letter-spacing: 0.12em; }

.section { padding: 70px 0; }
.section.alt { background: rgba(255, 255, 255, 0.65); }
.section-head { margin-bottom: 28px; }
.section-head h2 { font-size: 30px; margin-bottom: 8px; }
.section-head p { color: var(--mute); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
    padding: 22px;
    background: var(--cell);
    border: 1px solid var(--line);
}
.card:nth-child(3n+1) { transform: rotate(-0.7deg) translateY(4px); }
.card:nth-child(3n+2) { transform: rotate(0.5deg); }
.card:nth-child(3n) { transform: rotate(-0.3deg) translateY(-3px); }
.card h3 { margin: 10px 0 8px; font-size: 20px; }
.card p { color: var(--mute); font-size: 15px; }
.card.main { border-color: var(--ink); box-shadow: 5px 6px 0 rgba(30, 36, 48, 0.08); }
.icon {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    font-size: 12px;
    color: #fff;
    background: var(--ink);
}
.card:nth-child(2) .icon { background: var(--a); }
.card:nth-child(3) .icon { background: var(--b); }
.card:nth-child(5) .icon { background: var(--c); color: var(--ink); }
.solution-card { padding: 0; overflow: hidden; }
.solution-card img { height: 176px; width: 100%; object-fit: cover; }
.solution-card div { padding: 16px 18px 20px; }
.price { color: var(--a); margin-bottom: 8px; }

.cta {
    padding: 70px 0;
    text-align: center;
    background: var(--ink);
    color: #fff;
}
.cta h2 { font-size: 32px; margin-bottom: 12px; }
.cta p { color: #b8c0ce; margin-bottom: 22px; }
.cta .btn { background: #fff; color: var(--ink); }
.cta .btn-ghost { background: transparent; color: #fff; border-color: #fff; }
.cta-actions { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }

.site-footer {
    padding: 48px 0 24px;
    background: #fff;
    border-top: 1px solid var(--line);
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; }
.footer-grid h4 { margin-bottom: 12px; }
.footer-grid a, .footer-grid p { display: block; color: var(--mute); margin-bottom: 8px; font-size: 14px; }
.footer-bottom {
    margin-top: 28px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    color: var(--mute);
    font-size: 13px;
}

.page-hero { padding: 60px 0 24px; }
.page-hero h1 { font-size: 36px; margin: 10px 0 12px; }
.page-hero p { color: var(--mute); max-width: 40em; }
.dl-list, .help-list { display: grid; gap: 14px; }
.dl-item, .help-box {
    padding: 22px 24px;
    border: 1px solid var(--line);
    background: #fff;
}
.dl-item { display: flex; justify-content: space-between; gap: 20px; align-items: center; }
.dl-item:nth-child(2) { transform: rotate(0.4deg); }
.dl-item:nth-child(3) { transform: rotate(-0.5deg); }
.dl-item.main { border-color: var(--ink); }
.specs { display: flex; gap: 14px; color: var(--a); font-size: 13px; margin: 8px 0; }
.shot { margin-top: 28px; }
.shot img { width: 100%; border: 1px solid var(--line); transform: rotate(-0.4deg); }

@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: 16px;
    }
    .nav-wrap { flex-wrap: wrap; }
    .hero-grid, .grid-3, .data-grid, .footer-grid, .dl-item {
        grid-template-columns: 1fr;
        display: grid;
    }
    .card, .dl-item, .hero-visual img, .shot img { transform: none; }
}