:root {
    --bg: #061427;
    --bg-soft: #0b1f3e;
    --text: #e8f0ff;
    --muted: #b2c4e8;
    --primary: #00e5ff;
    --card: rgba(255, 255, 255, 0.05);
    --border: rgba(255, 255, 255, 0.18);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: "PingFang SC", "Microsoft Yahei", sans-serif; background: var(--bg); color: var(--text); scroll-behavior: smooth; }
a { color: var(--text); text-decoration: none; }
.container { width: min(1160px, 92%); margin: 0 auto; }
.section { padding: 88px 0; }
.section.dark { background: linear-gradient(180deg, #081a33 0%, #041224 100%); }
h1, h2, h3, h4 { margin-top: 0; }
p { color: var(--muted); line-height: 1.7; }

.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 50;
    transition: background .3s ease, backdrop-filter .3s ease, box-shadow .3s ease;
}
.site-header.is-scrolled {
    background: rgba(8, 22, 44, 0.65);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}
.nav-wrap { display: flex; justify-content: space-between; align-items: center; min-height: 72px; }
.brand { font-weight: 700; }
.main-nav { display: flex; gap: 20px; }
.main-nav a { color: #d8e8ff; }
.main-nav a:hover { color: var(--primary); }
.menu-toggle { display: none; background: transparent; border: 1px solid var(--border); color: #fff; border-radius: 8px; padding: 8px 12px; }

.hero { min-height: 100vh; position: relative; display: grid; align-items: center; overflow: hidden; padding-top: 96px; }
#particleCanvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.5; }
.hero-content { position: relative; display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: 36px; }
.hero-kicker { text-transform: uppercase; letter-spacing: 1.5px; color: var(--primary); font-size: 13px; }
.hero h1 { font-size: clamp(36px, 6vw, 64px); margin-bottom: 18px; }
.btn-primary { display: inline-block; padding: 12px 24px; border-radius: 999px; background: linear-gradient(90deg, #00d9ff, #38ffc4); color: #01202c; font-weight: 700; }
.hero-image img { width: 100%; border-radius: 16px; border: 1px solid var(--border); box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35); }

.grid { display: grid; gap: 18px; margin-top: 26px; }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px; }

.stats { margin-top: 24px; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.stats div { background: rgba(0, 229, 255, 0.08); border: 1px solid rgba(0, 229, 255, 0.3); border-radius: 12px; padding: 16px; }
.counter { display: block; font-size: 28px; font-weight: 700; color: #7df8ff; margin-bottom: 4px; }

.tag-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.tag-list span { padding: 8px 12px; border-radius: 999px; border: 1px solid var(--border); background: rgba(255, 255, 255, 0.04); }

.architecture { margin-top: 26px; }
.arch-row { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 10px; align-items: center; }
.arch-box { padding: 14px; border-radius: 10px; border: 1px solid var(--border); background: rgba(4, 30, 58, 0.6); text-align: center; }
.arch-arrow { color: var(--primary); font-size: 24px; font-weight: 700; }

.case-slider { margin-top: 18px; border: 1px solid var(--border); border-radius: 14px; padding: 18px; background: rgba(255, 255, 255, 0.03); }
.slide { display: none; }
.slide.active { display: block; }
.slider-controls { display: flex; gap: 10px; margin-top: 10px; }
.slider-controls button { border: 1px solid var(--border); background: transparent; color: #fff; padding: 8px 12px; border-radius: 8px; cursor: pointer; }

.logo-wall { margin-top: 10px; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 10px; }
.logo-wall span { text-align: center; border: 1px dashed var(--border); border-radius: 10px; padding: 12px; color: #d6e8ff; }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.contact-form { display: grid; gap: 12px; }
.contact-form input, .contact-form textarea {
    width: 100%;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.04);
    border-radius: 10px;
    padding: 12px;
    color: #fff;
}

.site-footer { padding: 42px 0; border-top: 1px solid var(--border); background: #030d1a; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 22px; }
.site-footer ul { margin: 0; padding-left: 18px; }
.site-footer p, .site-footer li { color: #99b2d8; }

@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .logo-wall { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .hero-content, .contact-grid, .footer-grid { grid-template-columns: 1fr; }
    .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .arch-row { grid-template-columns: 1fr; }
    .arch-arrow { display: none; }
}

@media (max-width: 768px) {
    .menu-toggle { display: inline-block; }
    .main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 4%;
        right: 4%;
        flex-direction: column;
        background: rgba(7, 20, 41, 0.96);
        border: 1px solid var(--border);
        border-radius: 12px;
        padding: 14px;
    }
    .main-nav.open { display: flex; }
    .grid-3, .grid-4, .stats, .logo-wall { grid-template-columns: 1fr; }
    .section { padding: 72px 0; }
}