/* ===== Design System ===== */
:root {
  --primary: #0a2a5c;
  --primary-light: #1a3f7a;
  --primary-dark: #061a3a;
  --accent: #0099cc;
  --accent-light: #00b8e6;
  --accent-dark: #0077a3;
  --white: #ffffff;
  --bg-light: #f4f7fb;
  --bg-card: #ffffff;
  --bg-card-alt: #f0f4fa;
  --text: #1a2a3a;
  --text-secondary: #4a5a6a;
  --text-muted: #7a8a9a;
  --border: #d0d8e0;
  --border-light: #e0e6ed;
  --shadow: 0 2px 12px rgba(10,42,92,0.08);
  --shadow-lg: 0 8px 32px rgba(10,42,92,0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: all 0.25s ease;
  --altera: #0071c5;
  --lattice: #00a651;
  --xilinx: #c41230;
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; scroll-padding-top:100px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--white);
  color: var(--text);
  line-height: 1.6;
}
.container { max-width:1100px; margin:0 auto; padding:0 20px; }
a { color:var(--accent); text-decoration:none; transition:var(--transition); }
a:hover { color:var(--accent-dark); }

/* ===== Top Bar ===== */
.top-bar {
  background: var(--primary);
  color: rgba(255,255,255,0.85);
  font-size:0.82rem;
  padding:6px 0;
}
.top-bar-inner { display:flex; justify-content:space-between; align-items:center; }
.top-left { display:flex; gap:20px; align-items:center; }
.top-item { display:flex; align-items:center; gap:4px; }
.top-icon { font-size:0.75rem; }
.top-item a { color:rgba(255,255,255,0.85); }
.top-item a:hover { color:#fff; }
.top-right { display:flex; align-items:center; gap:10px; }
.top-right a { color:rgba(255,255,255,0.85); font-size:0.82rem; }
.top-right a:hover { color:#fff; }
.top-divider { color:rgba(255,255,255,0.3); font-size:0.75rem; }
.lang-btn {
  background:rgba(255,255,255,0.15);
  border:1px solid rgba(255,255,255,0.3);
  color:#fff;
  padding:2px 12px;
  border-radius:4px;
  cursor:pointer;
  font-size:0.78rem;
  font-weight:600;
  transition:var(--transition);
  font-family:inherit;
}
.lang-btn:hover { background:rgba(255,255,255,0.25); }

/* ===== Navbar ===== */
.navbar {
  position:fixed; top:32px; left:0; right:0; z-index:1000;
  background:rgba(255,255,255,0.95);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border-light);
  transition:top 0.3s, box-shadow 0.3s;
}
.navbar.scrolled { top:0; box-shadow:var(--shadow); }
.nav-content { display:flex; align-items:center; justify-content:space-between; height:60px; }
.logo { display:flex; align-items:center; gap:10px; color:var(--text); }
.logo:hover { color:var(--text); }
.logo-icon { font-size:1.5rem; }
.logo-name { font-weight:700; font-size:1rem; display:block; line-height:1.1; }
.logo-sub { font-size:0.65rem; color:var(--text-muted); }
.nav-links { display:flex; list-style:none; gap:24px; align-items:center; }
.nav-links a {
  color:var(--text-secondary);
  font-size:0.9rem;
  font-weight:500;
  padding:4px 0;
  position:relative;
}
.nav-links a::after {
  content:''; position:absolute; bottom:-2px; left:0; width:0; height:2px;
  background:var(--accent); transition:width 0.3s;
}
.nav-links a:hover { color:var(--primary); }
.nav-links a:hover::after { width:100%; }
.nav-cta {
  background:var(--accent) !important; color:#fff !important; padding:8px 20px !important;
  border-radius:6px !important; font-weight:600 !important;
}
.nav-cta::after { display:none !important; }
.nav-cta:hover { background:var(--accent-dark) !important; color:#fff !important; }
.nav-toggle { display:none; flex-direction:column; gap:5px; background:none; border:none; cursor:pointer; padding:4px; }
.nav-toggle span { display:block; width:22px; height:2px; background:var(--text-secondary); border-radius:2px; transition:var(--transition); }

/* ===== Hero ===== */
.hero {
  position:relative; min-height:90vh; display:flex; align-items:center; padding-top:100px;
  background: linear-gradient(135deg, #f0f6ff 0%, #e8f0fe 50%, #faf0e6 100%);
  overflow:hidden;
}
.hero-bg {
  position:absolute; inset:0;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(0,153,204,0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(10,42,92,0.05) 0%, transparent 50%);
}
.hero-bg::before {
  content:''; position:absolute; inset:0;
  background-image: linear-gradient(rgba(0,153,204,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,153,204,0.03) 1px, transparent 1px);
  background-size:60px 60px;
}
.hero-content { position:relative; text-align:center; padding:60px 0; }
.hero-badge {
  display:inline-block; padding:6px 18px;
  background:rgba(0,153,204,0.08);
  border:1px solid rgba(0,153,204,0.2);
  border-radius:20px; font-size:0.82rem; color:var(--accent);
  font-weight:500; margin-bottom:24px;
}
.hero-title { font-size:2.8rem; font-weight:800; line-height:1.2; margin-bottom:16px; color:var(--primary); }
.hero-highlight {
  background:linear-gradient(135deg, var(--accent), var(--primary));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}
.hero-desc { font-size:1.05rem; color:var(--text-secondary); max-width:640px; margin:0 auto 32px; line-height:1.7; }
.hero-actions { display:flex; gap:16px; justify-content:center; margin-bottom:48px; }
.btn {
  display:inline-flex; align-items:center; padding:12px 28px; border-radius:6px;
  font-size:0.95rem; font-weight:600; cursor:pointer; transition:var(--transition);
  border:none; font-family:inherit;
}
.btn-primary { background:var(--accent); color:#fff; box-shadow:0 4px 16px rgba(0,153,204,0.3); }
.btn-primary:hover { background:var(--accent-dark); transform:translateY(-2px); color:#fff; }
.btn-outline { background:transparent; color:var(--accent); border:1.5px solid var(--accent); }
.btn-outline:hover { background:rgba(0,153,204,0.06); transform:translateY(-2px); }
.hero-stats { display:flex; justify-content:center; align-items:center; gap:0; }
.stat-item { text-align:center; padding:0 32px; }
.stat-num { display:block; font-size:2rem; font-weight:800; color:var(--primary); line-height:1; }
.stat-label { font-size:0.8rem; color:var(--text-muted); margin-top:4px; }
.stat-dot { width:6px; height:6px; background:var(--accent); border-radius:50%; opacity:0.3; }

/* ===== Brands Strip ===== */
.brands-strip { background:var(--white); border-top:1px solid var(--border-light); border-bottom:1px solid var(--border-light); padding:14px 0; }
.strip-inner { display:flex; align-items:center; gap:20px; justify-content:center; flex-wrap:wrap; }
.strip-label { font-size:0.78rem; color:var(--text-muted); font-weight:600; text-transform:uppercase; letter-spacing:1px; }
.strip-logos { display:flex; align-items:center; gap:16px; flex-wrap:wrap; }
.strip-logo { font-size:1rem; font-weight:700; color:var(--text-muted); letter-spacing:1px; }
.strip-logo.altera { color:var(--altera); }
.strip-logo.lattice { color:var(--lattice); }
.strip-logo.xilinx { color:var(--xilinx); }
.strip-dot { color:var(--border); font-size:0.9rem; }

/* ===== Section Common ===== */
.section { padding:80px 0; }
.section-header { text-align:center; margin-bottom:48px; }
.section-tag { display:inline-block; font-size:0.75rem; font-weight:700; color:var(--accent); letter-spacing:2px; text-transform:uppercase; margin-bottom:8px; }
.section-title { font-size:1.8rem; font-weight:700; color:var(--primary); margin-bottom:8px; }
.section-desc { font-size:0.95rem; color:var(--text-muted); }

/* ===== About ===== */
.about { background:var(--bg-light); }
.about-grid { display:grid; grid-template-columns:1.2fr 0.8fr; gap:48px; align-items:start; }
.about-text p { color:var(--text-secondary); margin-bottom:16px; font-size:0.95rem; line-height:1.7; }
.about-text strong { color:var(--primary); }
.about-features { display:flex; flex-direction:column; gap:12px; }
.af-item {
  display:flex; align-items:center; gap:14px; padding:16px 20px;
  background:var(--white); border:1px solid var(--border-light); border-radius:var(--radius);
  transition:var(--transition);
}
.af-item:hover { border-color:var(--accent); box-shadow:var(--shadow); transform:translateX(4px); }
.af-icon { font-size:1.4rem; flex-shrink:0; }
.af-item div { display:flex; flex-direction:column; }
.af-item strong { font-size:0.9rem; font-weight:600; }
.af-item span { font-size:0.8rem; color:var(--text-muted); }

/* ===== Brands ===== */
.brands-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.brand-card {
  background:var(--white); border:1px solid var(--border-light); border-radius:var(--radius-lg);
  overflow:hidden; transition:var(--transition);
}
.brand-card:hover { box-shadow:var(--shadow-lg); transform:translateY(-4px); border-color:var(--border); }
.brand-hd { padding:24px 20px; text-align:center; }
.altera-bg { background:linear-gradient(135deg, rgba(0,113,197,0.08), rgba(0,113,197,0.02)); border-bottom:2px solid var(--altera); }
.lattice-bg { background:linear-gradient(135deg, rgba(0,166,81,0.08), rgba(0,166,81,0.02)); border-bottom:2px solid var(--lattice); }
.xilinx-bg { background:linear-gradient(135deg, rgba(196,18,48,0.08), rgba(196,18,48,0.02)); border-bottom:2px solid var(--xilinx); }
.brand-logo { font-size:1.8rem; font-weight:900; letter-spacing:4px; }
.altera-bg .brand-logo { color:var(--altera); }
.lattice-bg .brand-logo { color:var(--lattice); }
.xilinx-bg .brand-logo { color:var(--xilinx); }
.brand-parent { font-size:0.78rem; color:var(--text-muted); margin-top:4px; }
.brand-bd { padding:20px; }
.brand-bd p { color:var(--text-secondary); font-size:0.88rem; margin-bottom:14px; line-height:1.6; }
.brand-tags { display:flex; flex-wrap:wrap; gap:6px; margin-bottom:14px; }
.brand-tags span {
  padding:2px 10px; background:rgba(0,153,204,0.06);
  border:1px solid rgba(0,153,204,0.15); border-radius:4px;
  font-size:0.72rem; color:var(--accent); font-family:monospace;
}
.brand-link { font-size:0.85rem; font-weight:600; color:var(--accent); }
.brand-link:hover { color:var(--accent-dark); }

/* ===== Products ===== */
.products { background:var(--bg-light); }
.products-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.pc {
  display:flex; flex-direction:column; padding:24px 20px;
  background:var(--white); border:1px solid var(--border-light); border-radius:var(--radius);
  transition:var(--transition); color:var(--text);
}
.pc:hover { border-color:var(--accent); box-shadow:var(--shadow); transform:translateY(-3px); color:var(--text); }
.pc-icon { font-size:1.8rem; margin-bottom:12px; }
.pc h3 { font-size:1rem; font-weight:600; margin-bottom:6px; }
.pc p { color:var(--text-muted); font-size:0.85rem; line-height:1.5; flex:1; }
.pc-arrow { display:inline-block; margin-top:10px; color:var(--accent); font-size:1.1rem; transition:var(--transition); }
.pc:hover .pc-arrow { transform:translateX(4px); }

/* ===== Service ===== */
.service-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.sv-card {
  padding:28px 24px; background:var(--white); border:1px solid var(--border-light);
  border-radius:var(--radius-lg); transition:var(--transition); position:relative;
}
.sv-card:hover { border-color:var(--accent); box-shadow:var(--shadow); transform:translateY(-3px); }
.sv-highlight {
  grid-column:1/-1;
  background:linear-gradient(135deg, rgba(0,153,204,0.04), rgba(10,42,92,0.04));
  border-color:rgba(0,153,204,0.2);
}
.sv-badge {
  position:absolute; top:12px; right:16px; padding:2px 10px;
  background:var(--accent); color:#fff; font-size:0.65rem; font-weight:700;
  border-radius:3px; letter-spacing:1px;
}
.sv-icon { font-size:1.8rem; margin-bottom:12px; }
.sv-card h3 { font-size:1.05rem; font-weight:600; margin-bottom:8px; color:var(--primary); }
.sv-card p { color:var(--text-secondary); font-size:0.88rem; line-height:1.6; }

/* ===== Trust Strip ===== */
.trust-strip { background:var(--primary); padding:28px 0; }
.trust-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }
.ti {
  display:flex; align-items:flex-start; gap:12px;
  padding:16px; background:rgba(255,255,255,0.06); border-radius:var(--radius);
}
.ti span:first-child { font-size:1.3rem; flex-shrink:0; }
.ti div { display:flex; flex-direction:column; }
.ti strong { font-size:0.85rem; font-weight:600; color:#fff; margin-bottom:2px; }
.ti span:last-child { font-size:0.78rem; color:rgba(255,255,255,0.6); }

/* ===== Contact ===== */
.contact { background:var(--bg-light); }
.contact-grid { display:grid; grid-template-columns:1.3fr 0.7fr; gap:32px; align-items:start; }
.contact-form { padding:32px; background:var(--white); border:1px solid var(--border-light); border-radius:var(--radius-lg); }
.form-row { display:flex; gap:16px; margin-bottom:16px; }
.fg { flex:1; margin-bottom:16px; }
.form-row .fg { margin-bottom:0; }
.fg label { display:block; font-size:0.8rem; font-weight:500; color:var(--text-secondary); margin-bottom:6px; }
.fg input, .fg textarea {
  width:100%; padding:10px 14px; background:var(--bg-light);
  border:1px solid var(--border); border-radius:6px; color:var(--text);
  font-size:0.9rem; font-family:inherit; transition:var(--transition);
}
.fg input:focus, .fg textarea:focus { outline:none; border-color:var(--accent); box-shadow:0 0 0 3px rgba(0,153,204,0.1); }
.fg textarea { resize:vertical; }
.btn-full { width:100%; }

.contact-info { display:flex; flex-direction:column; gap:16px; }
.ci-card { padding:24px; background:var(--white); border:1px solid var(--border-light); border-radius:var(--radius-lg); }
.ci-card h3 { font-size:1rem; font-weight:600; margin-bottom:16px; padding-bottom:12px; border-bottom:1px solid var(--border-light); color:var(--primary); }
.ci-list { display:flex; flex-direction:column; gap:12px; }
.ci-item { display:flex; flex-direction:column; gap:2px; }
.ci-lbl { font-size:0.75rem; color:var(--text-muted); }
.ci-item span:last-child { font-size:0.9rem; color:var(--text); }
.ci-quick { padding:20px; background:var(--white); border:1px solid var(--border-light); border-radius:var(--radius-lg); }
.ci-quick h4 { font-size:0.9rem; font-weight:600; margin-bottom:12px; color:var(--primary); }
.ci-link { display:block; padding:8px 0; color:var(--text-secondary); font-size:0.9rem; border-bottom:1px solid var(--border-light); }
.ci-link:last-of-type { border-bottom:none; }
.ci-link:hover { color:var(--accent); }
.ci-note { font-size:0.78rem; color:var(--text-muted); margin-top:10px; }

/* ===== Footer ===== */
.footer { background:var(--primary-dark); color:rgba(255,255,255,0.8); padding:40px 0 20px; }
.footer-grid { display:grid; grid-template-columns:1fr 2fr; gap:48px; margin-bottom:32px; }
.fb-logo { font-size:1.1rem; font-weight:700; color:#fff; margin-bottom:8px; }
.footer-brand p { font-size:0.85rem; color:rgba(255,255,255,0.5); }
.footer-links { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.fc h4 { font-size:0.82rem; font-weight:600; color:rgba(255,255,255,0.7); text-transform:uppercase; letter-spacing:1px; margin-bottom:12px; }
.fc a { display:block; color:rgba(255,255,255,0.5); font-size:0.85rem; padding:4px 0; }
.fc a:hover { color:var(--accent-light); }
.footer-bottom { border-top:1px solid rgba(255,255,255,0.1); padding-top:16px; text-align:center; }
.footer-bottom p { font-size:0.8rem; color:rgba(255,255,255,0.4); }

/* ===== Responsive ===== */
@media (max-width:1024px) {
  .brands-grid { grid-template-columns:1fr; max-width:420px; margin:0 auto; }
  .service-grid { grid-template-columns:repeat(2,1fr); }
  .sv-highlight { grid-column:1/-1; }
  .hero-title { font-size:2.2rem; }
}
@media (max-width:768px) {
  .top-bar .top-hours { display:none; }
  .navbar { top:0; }
  .nav-toggle { display:flex; }
  .nav-links {
    display:none; position:absolute; top:60px; left:0; right:0;
    background:rgba(255,255,255,0.98); flex-direction:column; padding:20px; gap:12px;
    border-bottom:1px solid var(--border-light);
  }
  .nav-links.active { display:flex; }
  .hero-title { font-size:1.8rem; }
  .hero-desc { font-size:0.95rem; }
  .hero-stats { flex-wrap:wrap; gap:12px; }
  .stat-dot { display:none; }
  .stat-item { padding:0 20px; }
  .about-grid, .contact-grid { grid-template-columns:1fr; gap:28px; }
  .products-grid { grid-template-columns:repeat(2,1fr); }
  .service-grid { grid-template-columns:1fr; }
  .trust-grid { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr; gap:28px; }
  .footer-links { grid-template-columns:repeat(3,1fr); }
  .section { padding:60px 0; }
  .section-title { font-size:1.5rem; }
  .form-row { flex-direction:column; }
  .form-row .fg { margin-bottom:16px; }
}
@media (max-width:480px) {
  .hero-title { font-size:1.5rem; }
  .products-grid { grid-template-columns:1fr; }
  .trust-grid { grid-template-columns:1fr; }
  .footer-links { grid-template-columns:1fr 1fr; }
  .hero-actions { flex-direction:column; align-items:center; }
  .strip-inner { flex-direction:column; gap:8px; }
}

/* ===== Animations ===== */
.fade-in { opacity:0; transform:translateY(20px); transition:opacity 0.5s, transform 0.5s; }
.fade-in.visible { opacity:1; transform:translateY(0); }