:root {
  --bg: #05070f;
  --bg-2: #0a0f1e;
  --text: #eaf0ff;
  --text-soft: #9fb0d0;
  --text-dim: #6b7a9c;
  --accent: #4f8cff;
  --accent-2: #2fe6c4;
  --accent-3: #9b6bff;
  --glass-bg: rgba(255, 255, 255, 0.045);
  --glass-border: rgba(255, 255, 255, 0.10);
  --glass-hover: rgba(255, 255, 255, 0.07);
  --radius: 18px;
  --max: 1180px;
  --header-h: 72px;
  --font: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  font-family: var(--font);
  color: var(--text);
  background: radial-gradient(120% 120% at 50% 0%, #0a1024 0%, var(--bg) 55%);
  line-height: 1.7;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
a { color: inherit; text-decoration: none; }

/* ============ Animated background ============ */
#neural { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }
.bg-orbs { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.5; }
.orb-1 { width: 460px; height: 460px; background: radial-gradient(circle, rgba(79,140,255,0.55), transparent 70%); top: -120px; right: -80px; animation: float1 18s ease-in-out infinite; }
.orb-2 { width: 420px; height: 420px; background: radial-gradient(circle, rgba(47,230,196,0.42), transparent 70%); bottom: -140px; left: -100px; animation: float2 22s ease-in-out infinite; }
.orb-3 { width: 380px; height: 380px; background: radial-gradient(circle, rgba(155,107,255,0.40), transparent 70%); top: 40%; left: 55%; animation: float3 26s ease-in-out infinite; }
@keyframes float1 { 50% { transform: translate(-60px, 80px) scale(1.1); } }
@keyframes float2 { 50% { transform: translate(80px, -60px) scale(1.15); } }
@keyframes float3 { 50% { transform: translate(-90px, -40px) scale(0.9); } }

/* ============ Header ============ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50; height: var(--header-h);
  background: rgba(5, 7, 15, 0.55);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--glass-border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 42px; height: 42px; flex: none; border-radius: 12px; overflow: hidden; box-shadow: 0 8px 24px -8px rgba(79,140,255,0.8); }
.brand-mark img { width: 100%; height: 100%; object-fit: cover; display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-cn { font-weight: 700; font-size: 16px; }
.brand-en { font-size: 11px; color: var(--text-dim); letter-spacing: 0.3px; }
.nav { display: flex; gap: 28px; }
.nav a { font-size: 15px; color: var(--text-soft); font-weight: 500; transition: color 0.2s; }
.nav a:hover { color: var(--text); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.lang-toggle { border: 1px solid var(--glass-border); background: var(--glass-bg); cursor: pointer; padding: 7px 14px; border-radius: 999px; font-size: 13px; font-weight: 600; color: var(--text-soft); transition: all 0.2s; font-family: var(--font); }
.lang-toggle:hover { border-color: var(--accent); color: var(--text); }
.lang-toggle .lang-active { color: var(--text); }
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.menu-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s; }

/* ============ Side dot nav ============ */
.dots { position: fixed; right: 26px; top: 50%; transform: translateY(-50%); z-index: 45; display: flex; flex-direction: column; gap: 16px; }
.dot { width: 11px; height: 11px; border-radius: 50%; border: 1.5px solid rgba(255,255,255,0.35); position: relative; transition: all 0.3s; }
.dot:hover { border-color: var(--accent-2); }
.dot.is-active { background: linear-gradient(135deg, var(--accent), var(--accent-2)); border-color: transparent; box-shadow: 0 0 0 4px rgba(79,140,255,0.18); }
.dot::after { content: attr(data-label); position: absolute; right: 22px; top: 50%; transform: translateY(-50%); white-space: nowrap; font-size: 12px; color: var(--text-soft); background: rgba(10,15,30,0.85); border: 1px solid var(--glass-border); padding: 3px 9px; border-radius: 8px; opacity: 0; pointer-events: none; transition: opacity 0.2s; }
.dot:hover::after { opacity: 1; }

/* ============ Snap scroller ============ */
.snap { position: relative; z-index: 1; height: 100vh; overflow-y: scroll; scroll-snap-type: y mandatory; scroll-behavior: smooth; scrollbar-width: none; }
.snap::-webkit-scrollbar { display: none; }
.screen { min-height: 100vh; scroll-snap-align: start; display: flex; align-items: center; position: relative; padding: calc(var(--header-h) + 32px) 0 48px; }
.screen-inner { width: 100%; }

/* ============ Reveal animation ============ */
.reveal { opacity: 0; transform: translateY(34px); filter: blur(2px); transition: opacity 0.7s cubic-bezier(.2,.7,.2,1), transform 0.7s cubic-bezier(.2,.7,.2,1), filter 0.7s; transition-delay: var(--d, 0s); }
.reveal.in { opacity: 1; transform: none; filter: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1 !important; transform: none !important; filter: none !important; } }

/* ============ Glass ============ */
.glass { background: var(--glass-bg); border: 1px solid var(--glass-border); backdrop-filter: blur(10px); border-radius: var(--radius); }

/* ============ Hero ============ */
.hero { text-align: center; }
.hero-inner { display: flex; flex-direction: column; align-items: center; }
.hero-eyebrow { color: var(--accent-2); font-weight: 600; letter-spacing: 4px; font-size: 13px; text-transform: uppercase; margin-bottom: 22px; }
.hero-title { font-size: clamp(34px, 5.4vw, 62px); font-weight: 800; line-height: 1.16; letter-spacing: -0.5px; }
.hero-title .accent { background: linear-gradient(90deg, #74a4ff, #4fe3cf, #b08bff, #74a4ff); background-size: 300% 100%; -webkit-background-clip: text; background-clip: text; color: transparent; animation: shimmer 6s linear infinite; }
@keyframes shimmer { to { background-position: 300% 0; } }
.hero-subtitle { max-width: 660px; margin: 26px auto 0; color: var(--text-soft); font-size: 17px; }
.hero-cta { display: flex; gap: 16px; justify-content: center; margin-top: 38px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 30px; border-radius: 999px; font-weight: 600; font-size: 15px; transition: all 0.25s; cursor: pointer; }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #04101a; box-shadow: 0 14px 34px -12px rgba(79,140,255,0.9); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 20px 44px -12px rgba(79,140,255,1); }
.btn-ghost { border: 1px solid var(--glass-border); color: var(--text); background: var(--glass-bg); }
.btn-ghost:hover { background: var(--glass-hover); transform: translateY(-3px); }
.hero-stats { display: flex; gap: 56px; justify-content: center; margin-top: 70px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; }
.stat-num { font-size: 36px; font-weight: 800; background: linear-gradient(90deg, #74a4ff, #4fe3cf); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-label { font-size: 13px; color: var(--text-dim); margin-top: 6px; }

.scroll-hint { position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--text-dim); animation: bob 2.4s ease-in-out infinite; }
.mouse { width: 24px; height: 38px; border: 2px solid var(--text-dim); border-radius: 14px; position: relative; }
.mouse::before { content: ""; position: absolute; top: 7px; left: 50%; transform: translateX(-50%); width: 3px; height: 7px; background: var(--accent-2); border-radius: 2px; animation: wheel 1.6s ease-in-out infinite; }
.scroll-text { font-size: 11px; letter-spacing: 1px; }
@keyframes wheel { 50% { transform: translate(-50%, 9px); opacity: 0.3; } }
@keyframes bob { 50% { transform: translate(-50%, 8px); } }

/* ============ Section heads ============ */
.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-tag { display: inline-block; color: var(--accent-2); font-weight: 700; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 14px; }
.section-title { font-size: clamp(26px, 3.6vw, 40px); font-weight: 800; letter-spacing: -0.5px; }
.section-desc { color: var(--text-soft); margin-top: 16px; font-size: 16px; }

/* ============ About ============ */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 44px; align-items: start; }
.about-text p { color: var(--text-soft); margin-bottom: 18px; font-size: 16px; }
.about-points { list-style: none; display: flex; flex-direction: column; gap: 12px; margin-top: 8px; }
.about-points li { position: relative; padding-left: 30px; font-weight: 600; }
.about-points li::before { content: "✓"; position: absolute; left: 0; top: 1px; color: #04101a; background: linear-gradient(135deg, var(--accent), var(--accent-2)); width: 20px; height: 20px; border-radius: 50%; font-size: 12px; display: grid; place-items: center; }
.about-card { padding: 30px; }
.about-card h3 { font-size: 18px; margin-bottom: 18px; }
.info-list { display: flex; flex-direction: column; gap: 13px; }
.info-list > div { display: flex; flex-direction: column; gap: 2px; padding-bottom: 12px; border-bottom: 1px dashed var(--glass-border); }
.info-list > div:last-child { border-bottom: none; padding-bottom: 0; }
.info-list dt { font-size: 11px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; }
.info-list dd { font-weight: 600; font-size: 14px; }

/* ============ Services ============ */
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.service-card { padding: 26px 22px; transition: transform 0.25s, border-color 0.25s, background 0.25s, box-shadow 0.25s; }
.service-card:hover { transform: translateY(-6px); background: var(--glass-hover); border-color: rgba(79,140,255,0.5); box-shadow: 0 24px 50px -24px rgba(79,140,255,0.6); }
.service-icon { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; font-size: 22px; background: linear-gradient(135deg, rgba(79,140,255,0.22), rgba(47,230,196,0.18)); margin-bottom: 16px; color: var(--text); }
.service-card h3 { font-size: 17px; margin-bottom: 8px; }
.service-card p { color: var(--text-soft); font-size: 13.5px; }

/* ============ Strengths ============ */
.strength-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.strength-item { padding: 28px; transition: transform 0.25s, border-color 0.25s; }
.strength-item:hover { transform: translateY(-6px); border-color: rgba(47,230,196,0.5); }
.strength-num { font-size: 30px; font-weight: 800; background: linear-gradient(135deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; opacity: 0.9; }
.strength-item h3 { font-size: 18px; margin: 12px 0 8px; }
.strength-item p { color: var(--text-soft); font-size: 13.5px; }

/* ============ Contact ============ */
.screen-contact { flex-direction: column; justify-content: center; gap: 0; }
.screen-contact .screen-inner { flex: none; }
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.contact-card { padding: 34px 26px; text-align: center; transition: transform 0.25s, border-color 0.25s; }
.contact-card:hover { transform: translateY(-6px); border-color: rgba(79,140,255,0.5); }
.contact-icon { font-size: 28px; }
.contact-card h3 { font-size: 16px; margin: 14px 0 8px; }
.contact-card p, .contact-card a { color: var(--text-soft); font-size: 15px; }
.contact-card a:hover { color: var(--accent-2); }

/* ============ Footer ============ */
.site-footer { width: 100%; margin-top: 44px; padding: 26px 0; border-top: 1px solid var(--glass-border); }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.footer-brand { display: flex; flex-direction: column; gap: 3px; }
.footer-cn { font-weight: 700; font-size: 15px; }
.footer-en { font-size: 12px; color: var(--text-dim); }
.footer-meta { display: flex; flex-direction: column; gap: 4px; text-align: right; font-size: 12px; color: var(--text-dim); }

/* ============ Responsive ============ */
@media (max-width: 980px) {
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .strength-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .dots { display: none; }
}
@media (max-width: 720px) {
  .nav { position: fixed; inset: var(--header-h) 0 auto; flex-direction: column; background: rgba(5,7,15,0.95); backdrop-filter: blur(14px); padding: 8px 24px 16px; gap: 0; border-bottom: 1px solid var(--glass-border); transform: translateY(-130%); transition: transform 0.3s; }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 14px 0; border-bottom: 1px solid var(--glass-border); }
  .menu-toggle { display: flex; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-meta { text-align: left; }
  .hero-stats { gap: 32px; margin-top: 48px; }
  /* 移动端关闭强制吸附，避免内容超出被截断 */
  .snap { scroll-snap-type: none; }
  .screen { min-height: auto; padding: calc(var(--header-h) + 40px) 0 56px; }
}
@media (max-width: 480px) {
  .service-grid, .strength-grid { grid-template-columns: 1fr; }
  .brand-cn { font-size: 14px; }
}