:root {
    --ink: #1a2744;
    --mute: #5a6b88;
    --paper: #eef3fb;
    --card: rgba(255, 255, 255, 0.86);
    --line: #d4deef;
    --node: #4f6fd8;
    --glow: #7c9cff;
    --ok: #2a9d8f;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    line-height: 1.65;
    background-color: #eef3fb;
    background-image:
        radial-gradient(circle at 8% 12%, #c7d4f5 0 1.5px, transparent 2px),
        radial-gradient(circle at 22% 38%, #b8c8f0 0 1.5px, transparent 2px),
        radial-gradient(circle at 41% 18%, #c7d4f5 0 2px, transparent 2.5px),
        radial-gradient(circle at 63% 28%, #b8c8f0 0 1.5px, transparent 2px),
        radial-gradient(circle at 78% 14%, #c7d4f5 0 1.5px, transparent 2px),
        radial-gradient(circle at 91% 42%, #b8c8f0 0 2px, transparent 2.5px),
        radial-gradient(circle at 14% 72%, #c7d4f5 0 1.5px, transparent 2px),
        radial-gradient(circle at 36% 86%, #b8c8f0 0 1.5px, transparent 2px),
        radial-gradient(circle at 58% 68%, #c7d4f5 0 2px, transparent 2.5px),
        radial-gradient(circle at 82% 80%, #b8c8f0 0 1.5px, transparent 2px),
        linear-gradient(118deg, transparent 49.7%, rgba(79, 111, 216, 0.07) 50%, transparent 50.3%),
        linear-gradient(32deg, transparent 49.7%, rgba(79, 111, 216, 0.06) 50%, transparent 50.3%),
        linear-gradient(164deg, transparent 49.7%, rgba(124, 156, 255, 0.05) 50%, transparent 50.3%),
        radial-gradient(ellipse at 20% 0%, rgba(124, 156, 255, 0.16), transparent 46%),
        radial-gradient(ellipse at 90% 80%, rgba(42, 157, 143, 0.08), transparent 40%);
    background-attachment: fixed;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(1100px, 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(12px);
    border-bottom: 1px solid var(--line);
}
.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;
    position: relative;
    background:
        radial-gradient(circle at 50% 50%, #fff 0 3px, transparent 3.5px),
        radial-gradient(circle at 22% 72%, #fff 0 2px, transparent 2.5px),
        radial-gradient(circle at 78% 28%, #fff 0 2px, transparent 2.5px),
        linear-gradient(135deg, var(--node), #7c9cff);
    color: transparent;
    border-radius: 50%;
    box-shadow: 0 0 0 3px rgba(79, 111, 216, 0.12);
}
.logo-mark::after { content: "钉"; color: #fff; font-size: 12px; font-weight: 800; }
.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(--node);
    color: #fff;
    font-size: 12px;
    font-weight: 800;
    border-radius: 99px;
}
.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(--node); font-weight: 700; }
.nav-actions { display: flex; gap: 8px; }

.btn {
    display: inline-block;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--node), #6b86e6);
    color: #fff;
    font-weight: 800;
    font-size: 13px;
    border-radius: 99px;
    box-shadow: 0 6px 16px rgba(79, 111, 216, 0.22);
}
.btn:hover { filter: brightness(1.05); }
.btn-lg { padding: 12px 20px; }
.btn-ghost {
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--line);
    box-shadow: none;
}

.hero { padding: 48px 0 32px; position: relative; }
.hero::before {
    content: "";
    position: absolute;
    inset: 8% 6% auto auto;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(124, 156, 255, 0.18), transparent 68%);
    pointer-events: none;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 28px;
    align-items: center;
}
.hero-kicker {
    color: var(--node);
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 10px;
    letter-spacing: 0.04em;
}
.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; }
.hero-visual {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 12px;
    position: relative;
    box-shadow: 0 18px 40px rgba(79, 111, 216, 0.08);
}
.hero-visual::before,
.hero-visual::after {
    content: "";
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--glow);
    box-shadow: 0 0 0 6px rgba(124, 156, 255, 0.18);
    z-index: 1;
}
.hero-visual::before { top: 18px; left: 18px; }
.hero-visual::after { bottom: 22px; right: 22px; background: var(--ok); box-shadow: 0 0 0 6px rgba(42, 157, 143, 0.16); }
.hero-visual img { width: 100%; border-radius: 14px; }

.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: 22px 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(--node); }
.data-label { color: var(--mute); font-size: 12px; }

.section { padding: 48px 0; }
.section.alt { background: rgba(232, 239, 252, 0.72); }
.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: 14px; }
.card {
    padding: 18px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
}
.card.main {
    border-color: #b8c8f0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(232, 239, 252, 0.9));
}
.card h3 { margin: 8px 0; font-size: 16px; }
.card p { color: var(--mute); font-size: 14px; }
.icon {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background:
        radial-gradient(circle at 50% 50%, var(--node) 0 3px, transparent 3.5px),
        radial-gradient(circle at 18% 76%, var(--glow) 0 2px, transparent 2.5px),
        radial-gradient(circle at 80% 24%, var(--ok) 0 2px, transparent 2.5px);
    box-shadow: inset 0 0 0 1px rgba(79, 111, 216, 0.2);
}
.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: 54px 0;
    text-align: center;
    color: #fff;
    background:
        radial-gradient(circle at 18% 30%, rgba(124, 156, 255, 0.28) 0 2px, transparent 3px),
        radial-gradient(circle at 72% 64%, rgba(255, 255, 255, 0.18) 0 2px, transparent 3px),
        linear-gradient(135deg, #3d5bbb, #4f6fd8 48%, #2a9d8f);
}
.cta h2 { font-size: 26px; margin-bottom: 8px; }
.cta p { color: #d7e2ff; margin-bottom: 18px; }
.cta-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.cta .btn { background: #fff; color: var(--node); box-shadow: none; }
.cta .btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.45); }

.site-footer {
    padding: 32px 0 16px;
    background: #15203a;
    color: #e6ecf8;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 18px; }
.footer-grid h4 { color: #9eb4f0; margin-bottom: 8px; font-size: 12px; letter-spacing: 0.08em; }
.footer-grid a, .footer-grid p { display: block; color: #93a0bd; margin-bottom: 5px; font-size: 13px; }
.footer-bottom {
    margin-top: 16px;
    padding-top: 10px;
    border-top: 1px solid #24314f;
    color: #6d7b99;
    font-size: 12px;
}

.page-hero { padding: 36px 0 8px; }
.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 {
    border-color: #b8c8f0;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.95), rgba(232, 239, 252, 0.88));
}
.specs { display: flex; gap: 12px; color: var(--node); 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, .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); }
}