:root {
  --bg: #ffffff;
  --bg-soft: #f5f5f7;
  --ink: #0a0a0a;
  --muted: #5b6270;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --accent-light: #7aa2ff;
  --border: #e4e6eb;
  --max: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 64px; }

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--accent-dark); }
a:hover { color: var(--accent); }

:focus-visible { outline: 3px solid #f59e0b; outline-offset: 3px; border-radius: 4px; }

.container { width: min(100% - 2.5rem, var(--max)); margin-inline: auto; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 1rem; top: -4rem; z-index: 100;
  background: var(--ink); color: #fff; padding: .6rem 1rem; border-radius: 6px;
}
.skip-link:focus { top: 1rem; color: #fff; }

/* Header */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: rgba(10, 10, 10, .85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 64px; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 700; font-size: 1.05rem; color: #fff; text-decoration: none; }
.brand:hover { color: #fff; }
.site-nav ul { display: flex; align-items: center; gap: 2rem; list-style: none; margin: 0; padding: 0; }
.site-nav a { color: #d4d7de; text-decoration: none; font-weight: 500; font-size: .95rem; }
.site-nav a:hover { color: #fff; }

.nav-toggle { display: none; background: none; border: 0; padding: .6rem; cursor: pointer; }
.nav-toggle .bars, .nav-toggle .bars::before, .nav-toggle .bars::after {
  display: block; width: 24px; height: 2px; background: #fff; position: relative; content: "";
  transition: transform .2s, opacity .2s;
}
.nav-toggle .bars::before { position: absolute; top: -7px; }
.nav-toggle .bars::after { position: absolute; top: 7px; }
.nav-toggle[aria-expanded="true"] .bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .bars::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bars::after { transform: translateY(-7px) rotate(-45deg); }

/* Buttons */
.btn {
  display: inline-block; padding: .85rem 1.6rem; border-radius: 8px;
  background: var(--accent); color: #fff; font: inherit; font-weight: 600; text-decoration: none;
  border: 0; cursor: pointer; transition: background .15s;
}
.btn:hover { background: var(--accent-dark); color: #fff; }

/* Hero */
.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  background:
    radial-gradient(ellipse at 75% 30%, rgba(37, 99, 235, .35), transparent 55%),
    #0a0a0a;
  color: #fff;
  padding: 7rem 0 5rem;
  position: relative;
}
.hero h1 {
  font-size: clamp(2.4rem, 6.5vw, 5rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  margin: 0 0 1.5rem;
  max-width: 16ch;
  text-transform: uppercase;
}
.accent { color: var(--accent-light); }
.lead { font-size: clamp(1.05rem, 2vw, 1.3rem); max-width: 56ch; color: #c3c8d2; margin: 0; }
.scroll-down {
  position: absolute; left: 50%; bottom: 2rem; transform: translateX(-50%);
  color: #fff; opacity: .7; animation: bob 2s ease-in-out infinite;
}
.scroll-down:hover { color: #fff; opacity: 1; }
@keyframes bob { 0%, 100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 8px); } }

/* Sections */
.section { padding: clamp(3.5rem, 9vw, 6.5rem) 0; }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0 0 .75rem; line-height: 1.15; letter-spacing: -.01em; }
h3 { margin: 0 0 .4rem; font-size: 1.2rem; }
.section-intro { color: var(--muted); font-size: 1.1rem; max-width: 60ch; margin: 0 0 2.5rem; }

/* Model */
.big { font-size: clamp(1.6rem, 3.6vw, 2.6rem); max-width: 28ch; margin-bottom: 3rem; }
.pillars { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 2rem; }
.pillars > div { border-top: 3px solid var(--accent); padding-top: 1rem; }
.pillars p { margin: 0; color: var(--muted); }

/* Solutions */
.solutions { background: var(--bg-soft); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.5rem; }
.solution {
  background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 1.75rem;
  transition: box-shadow .2s, transform .2s;
}
.solution:hover { box-shadow: 0 10px 30px rgba(10, 10, 10, .08); transform: translateY(-2px); }
.tagline { color: var(--ink); font-weight: 500; margin: 0 0 1.25rem; }
.solution dl { margin: 0; display: grid; grid-template-columns: 5.5rem 1fr; gap: .6rem 1rem; font-size: .95rem; }
.solution dt { color: var(--accent-dark); font-weight: 600; }
.solution dd { margin: 0; color: var(--muted); }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 4rem; align-items: start; }
.mail-link { font-weight: 600; font-size: 1.1rem; }
.form { display: grid; gap: 1.1rem; }
.field { display: grid; gap: .35rem; }
label { font-weight: 600; font-size: .95rem; }
input, textarea {
  width: 100%; font: inherit; color: var(--ink);
  padding: .75rem .9rem; border: 1px solid #c7ccd6; border-radius: 8px; background: #fff;
}
input:focus, textarea:focus { border-color: var(--accent); outline: 3px solid rgba(37, 99, 235, .25); outline-offset: 0; }
input[aria-invalid="true"], textarea[aria-invalid="true"] { border-color: #b91c1c; }
.form-status { margin: 0; min-height: 1.4em; font-size: .95rem; color: var(--muted); }
.form-status.error { color: #b91c1c; }
.form .btn { justify-self: start; }

/* Footer */
.site-footer { background: #0a0a0a; color: #a9afbb; padding-top: 3.5rem; font-size: .95rem; }
.site-footer a { color: #d9dde6; }
.site-footer a:hover { color: #fff; }
.company-details h2 { font-size: 1.1rem; color: #fff; margin-bottom: 1.25rem; letter-spacing: .02em; }
.details { margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.25rem 2rem; }
.details dt { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: #7d8494; }
.details dd { margin: .15rem 0 0; color: #e7eaf0; }
.details dd a { display: inline-block; margin-left: .35rem; }
.status::before { content: ""; display: inline-block; width: .55rem; height: .55rem; background: #4ade80; border-radius: 50%; margin-right: .45rem; }
.footer-bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 1.5rem;
  margin-top: 2.5rem; padding: 1.5rem 0; border-top: 1px solid rgba(255, 255, 255, .1);
}
.footer-bottom p { margin: 0; }

/* Mobile */
@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute; top: 100%; left: 0; right: 0; background: #0a0a0a;
    border-bottom: 1px solid rgba(255, 255, 255, .1); display: none; padding: 1rem 1.25rem 1.5rem;
  }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; align-items: flex-start; gap: 1.1rem; }
  .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}