:root {
    --ink: #0c1220;
    --dusk: #1a2744;
    --mist: #8fa3c4;
    --paper: #f4efe4;
    --gold: #d4a574;
    --lamp: #e8c9a0;
    --glass: rgba(244, 239, 228, 0.08);
    --line: rgba(232, 201, 160, 0.22);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", "Georgia", serif;
    color: var(--paper);
    background: var(--ink);
    line-height: 1.75;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.verse-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 24px;
    letter-spacing: 0.28em;
    font-size: 11px;
    color: var(--gold);
    background: linear-gradient(90deg, #0a0f1a, #1a2744 50%, #0a0f1a);
    border-bottom: 1px solid var(--line);
}
.verse-bar i {
    display: inline-block;
    width: 7px;
    height: 7px;
    margin: 0 3px;
    border-radius: 50%;
    background: var(--gold);
    opacity: 0.55;
}

.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(14px);
    background: rgba(12, 18, 32, 0.78);
    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: 0.12em;
}
.logo-mark {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border: 1px solid var(--gold);
    color: var(--gold);
    font-family: "Microsoft YaHei", sans-serif;
}
.nav-toggle { display: none; }
.nav-burger {
    display: none;
    margin-left: auto;
    padding: 6px 10px;
    border: 1px solid var(--gold);
    color: var(--gold);
    font-size: 13px;
}
.nav-menu { display: flex; gap: 18px; flex: 1; font-size: 14px; }
.nav-menu a { color: var(--mist); }
.nav-menu a.active, .nav-menu a:hover { color: var(--lamp); }
.nav-actions { display: flex; gap: 10px; }

.btn {
    display: inline-block;
    padding: 10px 18px;
    border: 1px solid var(--gold);
    color: var(--gold);
    letter-spacing: 0.08em;
}
.btn:hover { background: rgba(212, 165, 116, 0.12); }
.btn-lg { padding: 14px 26px; }
.btn-ghost { border-color: var(--mist); color: var(--mist); }

.hero {
    position: relative;
    padding: 72px 0 80px;
    overflow: hidden;
    background:
        linear-gradient(180deg, rgba(12, 18, 32, 0.2), rgba(12, 18, 32, 0.75)),
        radial-gradient(ellipse at 20% 10%, rgba(212, 165, 116, 0.18), transparent 45%),
        radial-gradient(ellipse at 80% 80%, rgba(143, 163, 196, 0.16), transparent 50%),
        var(--dusk);
}
.hero::before,
.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.hero::before {
    background:
        linear-gradient(115deg, transparent 38%, rgba(232, 201, 160, 0.08) 50%, transparent 62%),
        repeating-linear-gradient(90deg, rgba(244, 239, 228, 0.03) 0 1px, transparent 1px 48px);
    mix-blend-mode: screen;
}
.hero::after {
    background: linear-gradient(180deg, transparent 70%, var(--ink));
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
}
.tag {
    display: inline-block;
    margin-bottom: 14px;
    color: var(--gold);
    letter-spacing: 0.22em;
    font-size: 12px;
}
.hero-kicker {
    margin-bottom: 10px;
    color: var(--lamp);
    font-style: italic;
}
.hero h1 {
    font-size: clamp(32px, 4.4vw, 52px);
    line-height: 1.25;
    margin-bottom: 18px;
    font-weight: 600;
}
.hero p { color: var(--mist); max-width: 36em; }
.stanza {
    margin-top: 28px;
    padding: 22px 24px;
    border-left: 2px solid var(--gold);
    background: var(--glass);
}
.meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 16px;
    color: var(--gold);
    font-size: 13px;
    letter-spacing: 0.08em;
}
.hero-visual {
    position: relative;
}
.hero-visual img {
    width: 100%;
    border: 1px solid var(--line);
    opacity: 0.92;
}
.hero-visual::after {
    content: "";
    position: absolute;
    inset: 18% 8% auto 28%;
    height: 58%;
    background: linear-gradient(180deg, transparent, rgba(12, 18, 32, 0.35));
    box-shadow: inset 0 0 80px rgba(212, 165, 116, 0.12);
    pointer-events: none;
    mix-blend-mode: multiply;
}

.data-band {
    padding: 36px 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: linear-gradient(90deg, #10182a, #1a2744, #10182a);
}
.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: center;
}
.data-num { font-size: 28px; color: var(--lamp); letter-spacing: 0.04em; }
.data-label { color: var(--mist); font-size: 13px; letter-spacing: 0.16em; }

.section { padding: 72px 0; }
.section.alt {
    background:
        radial-gradient(ellipse at 70% 20%, rgba(212, 165, 116, 0.08), transparent 40%),
        #111827;
}
.section-head { margin-bottom: 32px; }
.section-head h2 { font-size: 30px; margin-bottom: 8px; }
.section-head p { color: var(--mist); font-style: italic; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
    padding: 22px;
    background: rgba(244, 239, 228, 0.04);
    border: 1px solid var(--line);
}
.card h3 { margin: 10px 0 8px; font-size: 20px; }
.card p { color: var(--mist); font-size: 15px; }
.card.main { border-color: var(--gold); background: rgba(212, 165, 116, 0.08); }
.icon {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border: 1px solid var(--gold);
    color: var(--gold);
    font-size: 12px;
    letter-spacing: 0.08em;
    font-family: "Microsoft YaHei", sans-serif;
}
.solution-card { padding: 0; overflow: hidden; }
.solution-card img { height: 180px; width: 100%; object-fit: cover; opacity: 0.88; }
.solution-card div { padding: 18px 20px 22px; }
.price { color: var(--gold); margin-bottom: 8px; letter-spacing: 0.1em; }

.cta {
    padding: 70px 0;
    text-align: center;
    background:
        linear-gradient(180deg, rgba(12, 18, 32, 0.3), rgba(12, 18, 32, 0.7)),
        radial-gradient(ellipse at 50% 0%, rgba(212, 165, 116, 0.16), transparent 55%),
        var(--dusk);
}
.cta h2 { font-size: 32px; margin-bottom: 12px; }
.cta p { color: var(--mist); margin-bottom: 22px; }
.cta-actions { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }

.site-footer {
    padding: 48px 0 24px;
    background: #090d16;
    border-top: 1px solid var(--line);
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; }
.footer-grid h4 { color: var(--gold); margin-bottom: 12px; letter-spacing: 0.12em; font-weight: 500; }
.footer-grid a, .footer-grid p { display: block; color: var(--mist); margin-bottom: 8px; font-size: 14px; }
.footer-bottom {
    margin-top: 28px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    color: #6d7c96;
    font-size: 13px;
}

.page-hero { padding: 64px 0 36px; }
.page-hero h1 { font-size: 36px; margin: 10px 0 12px; }
.page-hero p { color: var(--mist); max-width: 40em; }
.dl-list, .help-list { display: grid; gap: 16px; }
.dl-item, .help-box {
    padding: 22px 24px;
    border: 1px solid var(--line);
    background: rgba(244, 239, 228, 0.04);
}
.dl-item { display: flex; justify-content: space-between; gap: 20px; align-items: center; }
.dl-item.main { border-color: var(--gold); }
.specs { display: flex; gap: 14px; color: var(--gold); font-size: 13px; margin: 8px 0; }
.shot { margin-top: 28px; }
.shot img { width: 100%; border: 1px solid var(--line); }

@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;
    }
    .dl-item { justify-items: start; }
}