/* ===== 万煜VNYU 全新设计系统 v2 ===== */
:root {
  --bg: #07070a;
  --bg-1: #0c0c12;
  --bg-2: #111118;
  --surface: rgba(255,255,255,0.025);
  --surface-hover: rgba(255,255,255,0.05);
  --text: #eef0f3;
  --text-sub: #9ca3af;
  --text-dim: #5c6370;
  --accent: #5b8def;
  --accent-glow: rgba(91,141,239,0.15);
  --gold: #c9a961;
  --gold-dim: rgba(201,169,97,0.12);
  --border: rgba(255,255,255,0.06);
  --border-hi: rgba(255,255,255,0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1280px;
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width:100%; display:block; }
a { color:inherit; text-decoration:none; }
::selection { background: var(--accent); color: var(--bg); }

/* === Ambient background === */
body::before {
  content:''; position:fixed; inset:0; z-index:-1; pointer-events:none;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(91,141,239,0.08), transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 100%, rgba(201,169,97,0.04), transparent 60%),
    var(--bg);
}

/* === Navigation === */
.nav {
  position: fixed; top:0; left:0; right:0; z-index:100;
  transition: all .4s cubic-bezier(.16,1,.3,1);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(7,7,10,0.82);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-color: var(--border);
}
.nav-inner {
  max-width: var(--maxw); margin:0 auto; padding:0 28px;
  display:flex; align-items:center; justify-content:space-between; height:70px;
}
.logo {
  display:flex; align-items:center; justify-content:center;
  background:#fff; border-radius:10px; padding:6px 12px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.3);
}
.logo img { height:42px; width:auto; }
.nav-links { display:flex; gap:28px; align-items:center; margin-left:auto; }
.nav-links a {
  font-size:.875rem; color:var(--text-sub); transition:color .2s;
  position:relative; font-weight:400;
}
.nav-links a::after {
  content:''; position:absolute; bottom:-4px; left:0; right:0; height:1px;
  background:var(--accent); transform:scaleX(0); transition:transform .3s;
}
.nav-links a:hover, .nav-links a.active { color:var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { transform:scaleX(1); }
.nav-cta {
  border:1px solid rgba(91,141,239,0.4) !important;
  color:var(--accent) !important; padding:7px 18px; border-radius:6px;
  font-size:.82rem; transition:all .25s; background:rgba(91,141,239,0.06);
}
.nav-cta::after { display:none !important; }
.nav-cta:hover { background:var(--accent); color:var(--bg) !important; box-shadow:0 4px 20px var(--accent-glow); }
.menu-btn { display:none; flex-direction:column; gap:5px; cursor:pointer; padding:4px; }
.menu-btn span { display:block; width:22px; height:2px; background:var(--text); border-radius:1px; transition:.3s; }

@media (max-width: 880px) {
  .nav-links {
    display:none; position:absolute; top:70px; left:0; right:0;
    background:rgba(7,7,10,0.96); backdrop-filter:blur(20px);
    flex-direction:column; padding:20px 28px; gap:18px;
    border-bottom:1px solid var(--border);
  }
  .nav-links.open { display:flex; }
  .nav-links a::after { display:none; }
  .menu-btn { display:flex; }
}

/* === Shared === */
.section { padding:110px 28px; position:relative; }
.container { max-width:var(--maxw); margin:0 auto; }
.page-spacer { height:70px; }

.eyebrow {
  display:inline-block; color:var(--accent); font-size:.72rem;
  letter-spacing:4px; text-transform:uppercase; font-weight:600;
  margin-bottom:16px;
}
.eyebrow.gold { color:var(--gold); }
.section-title {
  font-size:clamp(1.8rem,4.5vw,3rem); line-height:1.2;
  letter-spacing:-0.5px; margin-bottom:14px; font-weight:600;
}
.section-sub { color:var(--text-sub); font-size:1rem; max-width:580px; margin-bottom:56px; }
.section-head { margin-bottom:56px; }
.section-head.center { text-align:center; }
.section-head.center .section-sub { margin-left:auto; margin-right:auto; }

/* === Reveal animation === */
.reveal { opacity:0; transform:translateY(36px); transition:opacity .9s cubic-bezier(.16,1,.3,1), transform .9s cubic-bezier(.16,1,.3,1); }
.reveal.visible { opacity:1; transform:translateY(0); }

/* === Hero === */
.hero {
  min-height:100dvh; display:flex; align-items:center;
  padding-top:70px; position:relative; overflow:hidden;
}
.hero::before {
  content:''; position:absolute; inset:0; z-index:0; pointer-events:none;
  background:
    radial-gradient(circle at 75% 35%, rgba(91,141,239,0.1), transparent 50%),
    radial-gradient(circle at 20% 80%, rgba(201,169,97,0.05), transparent 50%);
}
.hero-grid {
  display:grid; grid-template-columns:1.1fr 1fr; gap:64px;
  align-items:center; position:relative; z-index:1;
}
.hero-label {
  display:inline-flex; align-items:center; gap:8px;
  color:var(--accent); font-size:.72rem; letter-spacing:4px;
  text-transform:uppercase; margin-bottom:24px; font-weight:600;
}
.hero-label::before { content:''; width:24px; height:1px; background:var(--accent); }
.hero-title {
  font-size:clamp(2.4rem,6vw,4.5rem); line-height:1.08;
  letter-spacing:-1px; margin-bottom:24px; font-weight:700;
}
.hero-title em {
  font-style:normal;
  background:linear-gradient(135deg, var(--accent) 0%, #7fb0ff 50%, var(--gold) 100%);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero-desc { color:var(--text-sub); font-size:1.05rem; max-width:460px; margin-bottom:40px; line-height:1.8; }
.hero-cta {
  display:inline-flex; align-items:center; gap:8px;
  background:var(--accent); color:var(--bg);
  padding:14px 36px; border-radius:8px; font-size:.9rem;
  font-weight:600; letter-spacing:.5px; transition:all .3s;
  box-shadow:0 4px 24px var(--accent-glow);
}
.hero-cta:hover { transform:translateY(-2px); box-shadow:0 8px 32px var(--accent-glow); filter:brightness(1.1); }
.hero-cta.outline {
  background:transparent; color:var(--text); border:1px solid var(--border-hi);
  box-shadow:none;
}
.hero-cta.outline:hover { border-color:var(--accent); color:var(--accent); box-shadow:0 4px 24px var(--accent-glow); }

.hero-img-wrap {
  position:relative; border-radius:var(--radius); overflow:hidden;
  box-shadow:0 20px 60px rgba(0,0,0,0.5);
}
.hero-img-wrap::before {
  content:''; position:absolute; inset:0; z-index:1; pointer-events:none;
  background:linear-gradient(135deg, rgba(91,141,239,0.08) 0%, transparent 50%, rgba(201,169,97,0.06) 100%);
}
.hero-img-wrap img { width:100%; height:auto; transition:transform 1.5s cubic-bezier(.16,1,.3,1); }
.hero-img-wrap:hover img { transform:scale(1.05); }

@media (max-width:880px) {
  .hero-grid { grid-template-columns:1fr; gap:40px; }
  .hero-img-wrap { order:-1; }
  .hero { padding-top:64px; }
  .logo img { height:36px; }
  .logo { padding:5px 10px; }
  .nav-inner { height:60px; }
  .nav-links { top:60px; }
  .section { padding:72px 24px; }
}

/* === Stats band === */
.stats {
  padding:64px 28px; position:relative;
  border-top:1px solid var(--border); border-bottom:1px solid var(--border);
  background:linear-gradient(180deg, var(--bg-1), var(--bg));
}
.stats-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:32px; text-align:center; }
.stat-num {
  font-size:clamp(2.2rem,5vw,3.2rem); font-weight:700; line-height:1;
  background:linear-gradient(135deg, var(--accent), var(--gold));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
  margin-bottom:10px;
}
.stat-label { color:var(--text-sub); font-size:.88rem; letter-spacing:.5px; }
@media (max-width:768px) { .stats-grid { grid-template-columns:1fr; gap:32px; } }

/* === Explore cards (home) === */
.explore-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.explore-card {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:36px 30px;
  transition:all .4s cubic-bezier(.16,1,.3,1);
  position:relative; overflow:hidden; display:block;
}
.explore-card::before {
  content:''; position:absolute; top:0; left:0; right:0; height:2px;
  background:linear-gradient(90deg, var(--accent), var(--gold));
  transform:scaleX(0); transform-origin:left; transition:transform .4s;
}
.explore-card:hover { background:var(--surface-hover); border-color:var(--border-hi); transform:translateY(-6px); }
.explore-card:hover::before { transform:scaleX(1); }
.explore-card h3 { font-size:1.2rem; margin-bottom:10px; font-weight:600; }
.explore-card p { color:var(--text-sub); font-size:.88rem; line-height:1.7; }
.explore-card .arrow { color:var(--accent); margin-top:18px; font-size:.85rem; display:inline-flex; align-items:center; gap:6px; transition:gap .2s; }
.explore-card:hover .arrow { gap:12px; }
@media (max-width:880px) { .explore-grid { grid-template-columns:1fr; } }

/* === CTA band === */
.cta-band { text-align:center; }
.cta-band h2 { font-size:clamp(1.8rem,4vw,2.6rem); margin-bottom:16px; font-weight:600; }
.cta-band p { color:var(--text-sub); margin-bottom:32px; }

/* === Products === */
.products-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(380px, 1fr)); gap:28px; }
.product-card {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden;
  transition:all .4s cubic-bezier(.16,1,.3,1);
}
.product-card:hover { border-color:var(--border-hi); transform:translateY(-6px); box-shadow:0 12px 40px rgba(0,0,0,0.3); }
.product-img-wrap { position:relative; overflow:hidden; aspect-ratio:4/3; background:var(--bg-1); }
.product-img-wrap::after {
  content:''; position:absolute; inset:0; pointer-events:none;
  background:linear-gradient(to top, rgba(7,7,10,0.4) 0%, transparent 30%);
}
.product-img-wrap img { width:100%; height:100%; object-fit:cover; transition:transform .8s cubic-bezier(.16,1,.3,1); }
.product-card:hover .product-img-wrap img { transform:scale(1.08); }
.product-body { padding:24px 28px 28px; }
.product-tag { display:inline-block; font-size:.7rem; color:var(--gold); letter-spacing:2px; text-transform:uppercase; margin-bottom:8px; font-weight:600; }
.product-name { font-size:1.2rem; font-weight:600; margin-bottom:8px; }
.product-desc { color:var(--text-sub); font-size:.88rem; margin-bottom:16px; line-height:1.7; }
.product-link { color:var(--accent); font-size:.82rem; letter-spacing:.5px; display:inline-flex; align-items:center; gap:6px; transition:gap .2s; }
.product-link:hover { gap:12px; }
@media (max-width:768px) { .products-grid { grid-template-columns:1fr; } }

/* === Tech === */
.tech-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.tech-item {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:36px 30px;
  transition:all .4s cubic-bezier(.16,1,.3,1); position:relative; overflow:hidden;
}
.tech-item::before {
  content:''; position:absolute; bottom:0; left:0; right:0; height:2px;
  background:linear-gradient(90deg, var(--accent), transparent);
  transform:scaleX(0); transform-origin:left; transition:transform .4s;
}
.tech-item:hover { background:var(--surface-hover); border-color:var(--border-hi); transform:translateY(-4px); }
.tech-item:hover::before { transform:scaleX(1); }
.tech-icon { width:44px; height:44px; margin-bottom:24px; color:var(--accent); }
.tech-title { font-size:1.1rem; font-weight:600; margin-bottom:10px; }
.tech-desc { color:var(--text-sub); font-size:.9rem; line-height:1.7; }
@media (max-width:880px) { .tech-grid { grid-template-columns:1fr; } }

/* === Brand === */
.brand-grid { display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:center; }
.brand-img-wrap {
  position:relative; overflow:hidden; border-radius:var(--radius);
  box-shadow:0 20px 60px rgba(0,0,0,0.4);
}
.brand-img-wrap::after {
  content:''; position:absolute; inset:0; pointer-events:none;
  background:linear-gradient(135deg, transparent 60%, rgba(201,169,97,0.06) 100%);
}
.brand-img-wrap img { width:100%; height:auto; }
@media (max-width:880px) { .brand-grid { grid-template-columns:1fr; } }

/* === Testimonials === */
.testimonials-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.t-card {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:36px 30px; position:relative;
  transition:all .4s; overflow:hidden;
}
.t-card::before {
  content:'\201C'; position:absolute; top:8px; right:24px;
  font-family:Georgia,serif; font-size:5rem; color:var(--accent); opacity:.1; line-height:1;
}
.t-card:hover { border-color:var(--border-hi); transform:translateY(-4px); }
.t-text { color:var(--text); font-size:.95rem; margin-bottom:24px; position:relative; z-index:1; line-height:1.8; }
.t-author { font-weight:600; font-size:.92rem; }
.t-role { color:var(--text-sub); font-size:.8rem; margin-top:2px; }
@media (max-width:880px) { .testimonials-grid { grid-template-columns:1fr; } }

/* === Contact === */
.contact { background:var(--bg-1); border-top:1px solid var(--border); }
.contact-grid { display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:start; }
@media (max-width:880px) { .contact-grid { grid-template-columns:1fr; } }
.form-group { margin-bottom:20px; }
.form-group label { display:block; font-size:.82rem; color:var(--text-sub); margin-bottom:8px; letter-spacing:.5px; }
.form-group input, .form-group select, .form-group textarea {
  width:100%; background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius-sm); padding:13px 16px; color:var(--text);
  font-size:.92rem; outline:none; transition:border-color .2s, background .2s; font-family:inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color:var(--accent); background:var(--surface-hover);
}
.form-group input::placeholder, .form-group textarea::placeholder { color:var(--text-dim); }
.form-actions { display:flex; gap:12px; flex-wrap:wrap; align-items:center; }
.btn-primary {
  background:var(--accent); color:var(--bg); border:none;
  padding:13px 30px; border-radius:var(--radius-sm); font-size:.9rem;
  font-weight:600; cursor:pointer; transition:all .25s; font-family:inherit;
  box-shadow:0 4px 20px var(--accent-glow);
}
.btn-primary:hover { transform:translateY(-1px); filter:brightness(1.1); box-shadow:0 6px 28px var(--accent-glow); }
.btn-primary:disabled { opacity:.5; cursor:not-allowed; transform:none; }
.btn-secondary {
  background:transparent; color:var(--text-sub); border:1px solid var(--border-hi);
  padding:11px 20px; border-radius:var(--radius-sm); font-size:.82rem;
  cursor:pointer; transition:all .2s; font-family:inherit;
}
.btn-secondary:hover { border-color:var(--accent); color:var(--text); }
.form-hint { font-size:.78rem; color:var(--text-dim); margin-top:14px; }

/* === Footer === */
.footer { padding:56px 28px 36px; border-top:1px solid var(--border); background:var(--bg-1); }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr; gap:40px; max-width:var(--maxw); margin:0 auto; }
@media (max-width:768px) { .footer-grid { grid-template-columns:1fr; } }
.footer-logo { font-size:1.15rem; letter-spacing:2px; margin-bottom:14px; font-weight:600; }
.footer-desc { color:var(--text-sub); font-size:.84rem; max-width:320px; line-height:1.7; }
.footer-col h4 { font-size:.82rem; color:var(--text); margin-bottom:16px; letter-spacing:1px; font-weight:600; }
.footer-col a { display:block; color:var(--text-sub); font-size:.84rem; margin-bottom:10px; transition:color .2s; }
.footer-col a:hover { color:var(--accent); }
.footer-copy {
  max-width:var(--maxw); margin:36px auto 0; padding-top:24px;
  border-top:1px solid var(--border); color:var(--text-dim); font-size:.74rem;
}

/* === Info / Brandinfo === */
.info-grid { display:grid; grid-template-columns:1fr 1fr; gap:24px; }
@media (max-width:768px) { .info-grid { grid-template-columns:1fr; } }
.info-card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:32px 28px; }
.info-card h3 { font-size:1.05rem; font-weight:600; margin-bottom:20px; color:var(--accent); display:flex; align-items:center; gap:8px; }
.info-card h3::before { content:''; width:4px; height:16px; background:var(--accent); border-radius:2px; }
.info-card dl { margin:0; }
.info-row { display:flex; padding:10px 0; border-bottom:1px solid var(--border); font-size:.88rem; }
.info-row:last-child { border-bottom:none; }
.info-row dt { color:var(--text-sub); min-width:110px; flex-shrink:0; margin:0; }
.info-row dd { color:var(--text); margin:0 0 0 12px; }

.biz-grid { display:grid; grid-template-columns:1fr 1fr; gap:24px; }
@media (max-width:768px) { .biz-grid { grid-template-columns:1fr; } }
.biz-card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:28px 26px; }
.biz-card h4 { font-size:.95rem; font-weight:600; margin-bottom:14px; color:var(--gold); }
.biz-card ul { list-style:none; margin:0; padding:0; }
.biz-card li { color:var(--text-sub); font-size:.84rem; padding:5px 0 5px 18px; position:relative; line-height:1.6; }
.biz-card li::before { content:''; position:absolute; left:0; top:12px; width:6px; height:6px; border-radius:50%; background:var(--gold); }

.advantage-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
@media (max-width:768px) { .advantage-grid { grid-template-columns:1fr; } }
.advantage-card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:32px 28px; transition:all .3s; }
.advantage-card:hover { border-color:var(--border-hi); transform:translateY(-4px); }
.advantage-card .num { font-size:1.8rem; font-weight:700; color:var(--accent); margin-bottom:8px; opacity:.5; }
.advantage-card h4 { font-size:1rem; font-weight:600; margin-bottom:8px; }
.advantage-card p { color:var(--text-sub); font-size:.86rem; line-height:1.7; }

.timeline { position:relative; padding-left:28px; }
.timeline::before { content:''; position:absolute; left:7px; top:4px; bottom:4px; width:2px; background:linear-gradient(180deg, var(--accent), var(--gold), transparent); }
.timeline-item { position:relative; padding-bottom:28px; }
.timeline-item:last-child { padding-bottom:0; }
.timeline-item::before {
  content:''; position:absolute; left:-25px; top:6px; width:10px; height:10px;
  border-radius:50%; background:var(--bg); border:2px solid var(--accent);
}
.timeline-item .time { color:var(--accent); font-size:.78rem; margin-bottom:4px; font-weight:600; }
.timeline-item .text { color:var(--text-sub); font-size:.88rem; }

.outlook-box {
  background:var(--surface); border:1px solid var(--border);
  border-left:3px solid var(--gold); border-radius:var(--radius);
  padding:32px 36px;
}
.outlook-box p { color:var(--text-sub); font-size:.92rem; line-height:1.8; }

.subsection-title { font-size:1.15rem; font-weight:600; margin:56px 0 24px; color:var(--text); display:flex; align-items:center; gap:10px; }
.subsection-title::before { content:''; width:24px; height:2px; background:var(--accent); }

/* === News === */
.news-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
@media (max-width:880px) { .news-grid { grid-template-columns:1fr; } }
.news-card {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden; cursor:pointer;
  transition:all .4s cubic-bezier(.16,1,.3,1);
}
.news-card:hover { border-color:var(--border-hi); transform:translateY(-6px); box-shadow:0 12px 40px rgba(0,0,0,0.3); }
.news-body { padding:28px 26px; }
.news-tag {
  display:inline-block; font-size:.68rem; color:var(--gold);
  border:1px solid rgba(201,169,97,0.3); border-radius:4px;
  padding:3px 10px; margin-bottom:14px; letter-spacing:1px; font-weight:600;
}
.news-date { color:var(--text-dim); font-size:.78rem; margin-bottom:8px; }
.news-title { font-size:1.02rem; font-weight:600; margin-bottom:12px; line-height:1.4; }
.news-excerpt { color:var(--text-sub); font-size:.86rem; line-height:1.7; }
.news-more { color:var(--accent); font-size:.8rem; margin-top:16px; display:inline-flex; align-items:center; gap:6px; transition:gap .2s; }
.news-more:hover { gap:12px; }

/* === Reduce motion === */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity:1; transform:none; transition:none; }
  html { scroll-behavior:auto; }
  .hero-img-wrap img, .product-img-wrap img { transition:none; }
  .product-card:hover, .tech-item:hover, .hero-cta:hover, .explore-card:hover { transform:none; }
}