:root {
    --navy: #122033;
    --ink: #f4ece4;
    --mute: #c4b0a0;
    --hot: #ef4444;
    --warm: #f97316;
    --gold: #fbbf24;
    --cool: #1d4ed8;
}

* { 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(circle at 28% 38%, rgba(239,68,68,0.28) 0 8%, transparent 22%),
        radial-gradient(circle at 62% 32%, rgba(249,115,22,0.22) 0 7%, transparent 20%),
        radial-gradient(circle at 48% 58%, rgba(251,191,36,0.16) 0 6%, transparent 18%),
        radial-gradient(circle at 72% 62%, rgba(239,68,68,0.18) 0 5%, transparent 16%),
        #122033;
    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; }

.heat-strip {
    height: 10px;
    background: linear-gradient(90deg, #1d4ed8, #22c55e 18%, #fbbf24 42%, #f97316 68%, #ef4444);
}

.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(18,32,51,0.94);
    border-bottom: 1px solid rgba(251,191,36,0.25);
}
.nav-wrap {
    display: flex;
    align-items: center;
    gap: 16px;
    min-height: 68px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
}
.logo-mark {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 30%, #fbbf24, #ef4444);
    color: #fff;
}
.logo small { display: block; font-size: 10px; color: var(--mute); letter-spacing: 0.14em; }
.nav-toggle { display: none; }
.nav-burger {
    display: none;
    margin-left: auto;
    padding: 5px 10px;
    background: var(--hot);
    color: #fff;
    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(--gold); }
.nav-actions { display: flex; gap: 8px; }

.btn {
    display: inline-block;
    padding: 8px 14px;
    background: var(--hot);
    color: #fff;
    font-weight: 800;
    font-size: 13px;
}
.btn:hover { background: #f97316; }
.btn-lg { padding: 12px 18px; }
.btn-ghost {
    background: transparent;
    color: var(--ink);
    border: 1px solid rgba(251,191,36,0.4);
}

.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(--gold);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    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: rgba(18,32,51,0.65);
    border: 1px solid rgba(251,191,36,0.3);
    position: relative;
}
.hero-visual::after {
    content: "";
    position: absolute;
    inset: 18% 22% auto auto;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--hot);
    box-shadow: 0 0 0 8px rgba(239,68,68,0.25), 0 0 18px var(--hot);
}
.hero-visual img { width: 100%; }

.data-band { background: rgba(8,16,28,0.72); }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.data-grid > div {
    padding: 22px 16px;
    border-right: 1px solid rgba(251,191,36,0.2);
}
.data-grid > div:last-child { border-right: 0; }
.data-num { font-size: 24px; font-weight: 800; }
.data-grid > div:nth-child(1) .data-num { color: var(--hot); }
.data-grid > div:nth-child(2) .data-num { color: var(--warm); }
.data-grid > div:nth-child(3) .data-num { color: var(--gold); }
.data-grid > div:nth-child(4) .data-num { color: #4ade80; }
.data-label { color: var(--mute); font-size: 12px; }

.section { padding: 46px 0; }
.section.alt { background: rgba(8,16,28,0.45); }
.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: rgba(18,32,51,0.78);
    border: 1px solid rgba(251,191,36,0.18);
}
.card.main { border-color: var(--hot); }
.card h3 { margin: 8px 0; font-size: 17px; }
.card p { color: var(--mute); font-size: 14px; }
.icon {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--hot);
    box-shadow: 0 0 0 6px rgba(239,68,68,0.18);
}
.card:nth-child(2) .icon { background: var(--warm); box-shadow: 0 0 0 6px rgba(249,115,22,0.18); }
.card:nth-child(3) .icon { background: var(--gold); box-shadow: 0 0 0 6px rgba(251,191,36,0.18); }
.card:nth-child(5) .icon { background: var(--warm); box-shadow: 0 0 0 6px rgba(249,115,22,0.18); }
.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(--gold); font-weight: 800; margin-bottom: 6px; }

.cta {
    padding: 52px 0;
    text-align: center;
    background: linear-gradient(90deg, #b91c1c, #ea580c);
}
.cta h2 { font-size: 26px; margin-bottom: 8px; }
.cta p { opacity: 0.92; margin-bottom: 18px; }
.cta-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.cta .btn { background: #fff; color: #b91c1c; }
.cta .btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,0.5); }

.site-footer {
    padding: 32px 0 16px;
    background: #0b1624;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 20px; }
.footer-grid h4 { color: var(--gold); 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 rgba(251,191,36,0.2);
    color: #8a7466;
    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: rgba(18,32,51,0.78);
    border: 1px solid rgba(251,191,36,0.18);
}
.dl-item { display: flex; justify-content: space-between; gap: 18px; align-items: center; }
.dl-item.main { border-color: var(--hot); }
.specs { display: flex; gap: 12px; color: var(--gold); font-size: 12px; margin: 6px 0; font-weight: 800; }
.shot { margin-top: 20px; border: 1px solid rgba(251,191,36,0.25); }
.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 rgba(251,191,36,0.2); }
}