:root {
    --ink: #13192c;
    --mute: #5c6680;
    --paper: #f3f5ff;
    --card: #ffffff;
    --line: #d9def2;
    --halo: #6d5cff;
    --cyan: #2ec8f0;
    --ok: #1fad8a;
}

* { 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 16% -8%, rgba(109, 92, 255, 0.22), transparent 42%),
        radial-gradient(ellipse at 88% 6%, rgba(46, 200, 240, 0.16), transparent 36%),
        radial-gradient(ellipse at 70% 88%, rgba(109, 92, 255, 0.08), transparent 32%),
        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, 0.78);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(217, 222, 242, 0.8);
}
.nav-wrap { display: flex; align-items: center; gap: 16px; min-height: 68px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; }
.logo-mark {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    color: #fff;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--halo), var(--cyan));
    box-shadow: 0 0 18px rgba(109, 92, 255, 0.35);
    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(--halo);
    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(--halo); font-weight: 700; }
.nav-actions { display: flex; gap: 8px; }

.btn {
    display: inline-block;
    padding: 8px 15px;
    background: linear-gradient(135deg, var(--halo), #4f7dff);
    color: #fff;
    font-weight: 800;
    font-size: 13px;
    border-radius: 10px;
    box-shadow: 0 8px 20px rgba(109, 92, 255, 0.25);
}
.btn:hover { filter: brightness(1.06); }
.btn-lg { padding: 12px 18px; }
.btn-ghost {
    background: #fff;
    color: var(--ink);
    border: 1px solid var(--line);
    box-shadow: none;
}

.hero { padding: 40px 0 28px; }
.hero-grid {
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 24px;
    align-items: center;
}
.hero-kicker {
    color: var(--halo);
    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; }

.same-screen {
    display: grid;
    grid-template-columns: 1fr 0.86fr;
    gap: 12px;
    padding: 12px;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.62);
    border: 1px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 0 0 8px rgba(109, 92, 255, 0.06), 0 24px 50px rgba(79, 90, 180, 0.12);
    position: relative;
}
.same-screen::before,
.same-screen::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    filter: blur(18px);
}
.same-screen::before {
    width: 90px;
    height: 90px;
    top: -22px;
    left: -16px;
    background: rgba(109, 92, 255, 0.35);
}
.same-screen::after {
    width: 70px;
    height: 70px;
    right: -10px;
    bottom: -14px;
    background: rgba(46, 200, 240, 0.32);
}
.assist-pane, .dl-pane {
    position: relative;
    z-index: 1;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    overflow: hidden;
}
.assist-pane { padding: 14px 14px 0; }
.assist-pane p {
    margin: 0 0 10px;
    font-size: 12px;
    color: var(--mute);
}
.assist-pane strong { color: var(--halo); }
.assist-pane img { border-radius: 12px 12px 0 0; height: 168px; object-fit: cover; width: 100%; }
.dl-pane {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 18px 16px;
    background:
        radial-gradient(circle at 80% 0%, rgba(46, 200, 240, 0.18), transparent 40%),
        #161b33;
    color: #eef2ff;
    border: 0;
}
.dl-pane h3 { font-size: 18px; margin-bottom: 8px; }
.dl-pane p { color: #b8c0e0; font-size: 13px; }
.dl-pane .btn { margin-top: 16px; text-align: center; }

.data-band {
    background: rgba(255, 255, 255, 0.7);
    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(--halo); }
.data-label { color: var(--mute); font-size: 12px; }

.section { padding: 46px 0; }
.section.alt { background: rgba(232, 236, 255, 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: 16px;
}
.card.main {
    border-color: transparent;
    background: linear-gradient(#fff, #fff) padding-box, linear-gradient(135deg, var(--halo), var(--cyan)) border-box;
    border: 1px solid transparent;
    box-shadow: 0 12px 30px rgba(109, 92, 255, 0.1);
}
.card h3 { margin: 8px 0; font-size: 16px; }
.card p { color: var(--mute); font-size: 14px; }
.icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: radial-gradient(circle, #fff 0 3px, var(--halo) 4px 8px, transparent 9px);
    box-shadow: 0 0 12px rgba(109, 92, 255, 0.45);
}
.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;
    color: #fff;
    background:
        radial-gradient(circle at 20% 20%, rgba(46, 200, 240, 0.28), transparent 28%),
        radial-gradient(circle at 85% 80%, rgba(109, 92, 255, 0.4), transparent 32%),
        #1a1840;
}
.cta h2 { font-size: 26px; margin-bottom: 8px; }
.cta p { color: #c9ccff; margin-bottom: 18px; }
.cta-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.cta .btn { background: #fff; color: var(--halo); box-shadow: none; }
.cta .btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.28); }

.site-footer { padding: 30px 0 16px; background: #101428; color: #e8ebff; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 18px; }
.footer-grid h4 { color: #9aa6ff; margin-bottom: 8px; font-size: 12px; letter-spacing: 0.08em; }
.footer-grid a, .footer-grid p { display: block; color: #8f97b8; margin-bottom: 5px; font-size: 13px; }
.footer-bottom {
    margin-top: 16px;
    padding-top: 10px;
    border-top: 1px solid #22284a;
    color: #6b7394;
    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: 16px;
}
.dl-item { display: flex; justify-content: space-between; gap: 18px; align-items: center; }
.dl-item.main { box-shadow: 0 0 24px rgba(109, 92, 255, 0.12); }
.specs { display: flex; gap: 12px; color: var(--halo); font-size: 12px; margin: 6px 0; font-weight: 800; }
.shot { margin-top: 18px; border: 1px solid var(--line); border-radius: 16px; 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, .same-screen, .grid-3, .data-grid, .footer-grid, .dl-item { grid-template-columns: 1fr; display: grid; }
    .data-grid > div { border-right: 0; border-bottom: 1px solid var(--line); }
}