:root {
    --bg: #0f1115;
    --surface: #17191f;
    --text: #e5e7eb;
    --text-sec: #9ca3af;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #2d3748;
    --radius: 12px;
    --transition: 0.22s ease;
    --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-title: SF Pro Display, -apple-system, BlinkMacSystemFont, sans-serif;
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
    background:var(--bg);
    color:var(--text);
    font-family:var(--font-system);
    line-height:1.5;
    font-size:16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Navigation ──────────────────────────────────────── */
.sticky {
    position:sticky;
    top:0;
    z-index:1000;
    background:rgba(15,17,21,0.85);
    backdrop-filter:blur(16px);
    border-bottom:1px solid var(--border);
}
.nav-container {
    max-width:1280px;
    margin:0 auto;
    padding:0 24px;
    height:64px;
    display:flex;
    align-items:center;
    justify-content:space-between;
}
.logo {
    font-size:20px;
    font-weight:700;
    color:var(--text);
    text-decoration:none;
}
.nav-links {
    display:flex;
    gap:32px;
    list-style:none;
}
.nav-links a {
    color:var(--text-sec);
    text-decoration:none;
    font-weight:500;
    transition:var(--transition);
}
.nav-links a:hover { color:var(--accent); }
.cta-button {
    background:var(--accent);
    color:white;
    padding:8px 20px;
    border-radius:var(--radius);
    text-decoration:none;
    font-weight:500;
}
.cta-button:hover { background:var(--accent-hover); }

/* ── Hero ────────────────────────────────────────────── */
header {
    min-height:80vh;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    padding:0 24px;
    background:linear-gradient(to bottom, #0f1115, #1a1f2e);
}
.hero-content {
    max-width:900px;
}
h1 {
    font-size:clamp(3.5rem,10vw,5.5rem);
    font-weight:700;
    letter-spacing:-0.03em;
    line-height:1.05;
    margin-bottom:1.5rem;
    font-family: var(--font-title);
}
.hero-subtitle {
    font-size:1.375rem;
    color:var(--text-sec);
    max-width:640px;
    margin:0 auto 2.5rem;
}
.hero-cta {
    display:flex;
    gap:1.5rem;
    justify-content:center;
    flex-wrap:wrap;
}
.primary-cta, .secondary-cta, .large-cta {
    padding:14px 32px;
    border-radius:var(--radius);
    font-size:1.125rem;
    font-weight:600;
    text-decoration:none;
    transition:var(--transition);
}
.primary-cta, .large-cta {
    background:var(--accent);
    color:white;
}
.primary-cta:hover, .large-cta:hover { background:var(--accent-hover); }
.secondary-cta {
    background:transparent;
    border:1px solid var(--accent);
    color:var(--accent);
}
.secondary-cta:hover { background:rgba(59,130,246,0.1); }

/* ── Sections ────────────────────────────────────────── */
.section-products, .section-solutions, .section-standards {
    max-width:1280px;
    margin:120px auto;
    padding:0 24px;
}
h2 {
    font-size:clamp(2.5rem,6vw,3.75rem);
    font-weight:700;
    text-align:center;
    margin-bottom:3rem;
    font-family: var(--font-title);
}

/* Products grid */
.product-grid {
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
    gap:2rem;
}
.product-card {
    background:var(--surface);
    border:1px solid var(--border);
    border-radius:var(--radius);
    padding:2rem;
    transition:var(--transition);
}
.product-card:hover {
    border-color:var(--accent);
    transform:translateY(-4px);
}
.product-card h3 { font-size:1.5rem; margin-bottom:1rem; }
.product-card a {
    color:var(--accent);
    text-decoration:none;
    font-weight:500;
}

/* Solutions */
.solutions-grid {
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
    gap:1.5rem;
    text-align:center;
}
.solutions-grid div {
    background:var(--surface);
    border:1px solid var(--border);
    border-radius:var(--radius);
    padding:2.5rem 1.5rem;
    font-size:1.25rem;
    font-weight:500;
}

/* Standards */
.standards-list {
    list-style:none;
    font-size:1.125rem;
    color:var(--text-sec);
    max-width:800px;
    margin:0 auto;
    line-height:2;
}

/* CTA Banner */
.cta-banner {
    background:linear-gradient(135deg,#1B1F1F,#1B1217);
    text-align:center;
    padding:6rem 24px;
    margin:120px 0 0;
}
.cta-banner h2 { color:white; margin-bottom:0; }
.large-cta {
    font-size:1.25rem;
    padding:16px 48px;
}

/* Footer */
footer {
    background:#0a0c10;
    padding:5rem 24px 3rem;
    border-top:1px solid var(--border);
}
.footer-columns {
    max-width:1280px;
    margin:0 auto;
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
    gap:3rem;
}
.footer-columns h4 {
    font-size:1.125rem;
    margin-bottom:1.25rem;
    color:var(--text);
}
.footer-columns ul {
    list-style:none;
}
.footer-columns a {
    color:var(--text-sec);
    text-decoration:none;
    line-height:2;
    display:block;
}
.footer-columns a:hover { color:var(--accent); }

/* Responsive */
@media (max-width:768px) {
    .nav-container { flex-wrap:wrap; height:auto; padding:16px 24px; }
    .nav-links { gap:16px; font-size:14px; }
}