:root {
    --ink: #1c1f26;
    --mute: #5b6170;
    --paper: #ece8e2;
    --card: #ffffff;
    --line: #d8d2c8;
    --acc: #5a6fd6;
    --ok: #2f8a62;
}

* { 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:
        radial-gradient(ellipse at 70% 10%, rgba(90, 111, 214, 0.12), transparent 36%),
        var(--paper);
    line-height: 1.65;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }

.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
}
.nav-wrap { display: flex; align-items: center; gap: 16px; min-height: 66px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; }
.logo-mark {
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    background: var(--acc);
    color: #fff;
    border-radius: 8px;
    font-size: 13px;
}
.logo small { display: block; font-size: 10px; color: var(--mute); letter-spacing: 0.08em; }
.nav-toggle { display: none; }
.nav-burger {
    display: none;
    margin-left: auto;
    padding: 5px 10px;
    background: var(--acc);
    color: #fff;
    font-size: 12px;
    font-weight: 800;
    border-radius: 8px;
}
.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(--acc); font-weight: 700; }
.nav-actions { display: flex; gap: 8px; }

.btn {
    display: inline-block;
    padding: 8px 14px;
    background: var(--acc);
    color: #fff;
    font-weight: 800;
    font-size: 13px;
    border-radius: 10px;
}
.btn:hover { background: #4a5dc0; }
.btn-lg { padding: 12px 18px; }
.btn-ghost {
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--line);
}

.hero { padding: 40px 0 28px; }
.hero-grid {
    display: grid;
    grid-template-columns: 0.92fr 1.08fr;
    gap: 28px;
    align-items: center;
}
.hero-kicker {
    color: var(--acc);
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 10px;
}
.hero h1 { font-size: clamp(28px, 3.8vw, 40px); 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: 18px; }

.stage {
    position: relative;
    min-height: 300px;
    padding: 18px 8px 8px 92px;
}
.pile {
    position: absolute;
    left: 0;
    top: 28px;
    display: grid;
    gap: 10px;
}
.pile span {
    width: 68px;
    height: 48px;
    border-radius: 10px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 8px 18px rgba(40, 36, 30, 0.08);
}
.pile span:nth-child(2) { transform: translateX(6px); opacity: 0.86; }
.pile span:nth-child(3) { transform: translateX(12px); opacity: 0.7; }
.front {
    position: relative;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 18px 40px rgba(40, 36, 30, 0.12);
}
.front img { width: 100%; height: 240px; object-fit: cover; }
.front-bar {
    display: flex;
    gap: 6px;
    padding: 8px 12px;
    background: #f6f4f0;
    border-bottom: 1px solid var(--line);
}
.front-bar i {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #d8d2c8;
}

.data-band { background: rgba(255, 255, 255, 0.72); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.data-grid > div { padding: 20px 16px; border-right: 1px solid var(--line); }
.data-grid > div:last-child { border-right: 0; }
.data-num { font-size: 24px; font-weight: 800; color: var(--acc); }
.data-label { color: var(--mute); font-size: 12px; }

.section { padding: 46px 0; }
.section.alt { background: rgba(228, 222, 214, 0.55); }
.section-head { margin-bottom: 16px; }
.section-head h2 { font-size: 22px; 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: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
}
.card.main { box-shadow: 12px 12px 0 0 rgba(90, 111, 214, 0.12); }
.card h3 { margin: 8px 0; font-size: 16px; }
.card p { color: var(--mute); font-size: 14px; }
.icon {
    width: 22px;
    height: 16px;
    border: 1px solid var(--acc);
    border-radius: 4px;
    box-shadow: 4px 4px 0 0 rgba(90, 111, 214, 0.25);
}
.solution-card { padding: 0; overflow: hidden; }
.solution-card img { height: 150px; width: 100%; object-fit: cover; }
.solution-card div { padding: 14px 16px 16px; }
.price { color: var(--ok); font-weight: 800; margin-bottom: 6px; }

.cta {
    padding: 52px 0;
    text-align: center;
    background: #2a2f3d;
    color: #fff;
}
.cta h2 { font-size: 26px; margin-bottom: 8px; }
.cta p { color: #c6cbd8; margin-bottom: 18px; }
.cta-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.cta .btn { background: #fff; color: var(--acc); }
.cta .btn-ghost { background: transparent; color: #fff; border-color: #4d5364; }

.site-footer { padding: 30px 0 16px; background: #171a21; color: #ece8e2; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 18px; }
.footer-grid h4 { color: #a8b4ee; margin-bottom: 8px; font-size: 12px; letter-spacing: 0.08em; }
.footer-grid a, .footer-grid p { display: block; color: #969ba8; margin-bottom: 5px; font-size: 13px; }
.footer-bottom {
    margin-top: 16px;
    padding-top: 10px;
    border-top: 1px solid #2a2f3d;
    color: #6d7280;
    font-size: 12px;
}

.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: 10px; }
.dl-item, .help-box {
    padding: 18px 20px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
}
.dl-item { display: flex; justify-content: space-between; gap: 18px; align-items: center; }
.dl-item.main { box-shadow: 10px 10px 0 0 rgba(90, 111, 214, 0.12); }
.specs { display: flex; gap: 12px; color: var(--acc); font-size: 12px; margin: 6px 0; font-weight: 800; }
.shot { margin-top: 18px; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.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 { grid-template-columns: 1fr; display: grid; }
    .stage { padding-left: 0; min-height: 0; }
    .pile { display: none; }
    .data-grid > div { border-right: 0; border-bottom: 1px solid var(--line); }
}