/* RFBC Consulting — blue/white scheme */
:root {
  --bg: #0b1020;
  --surface: #0f1430;
  --text: #ffffff;
  --muted: #c7d0ea;
  --accent: #002f8e;
  --accent-2: #1e53ff;
  --maxw: 1100px;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 800px at 10% -10%, #16225d 0%, var(--bg) 40%) no-repeat, var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: min(100% - 2rem, var(--maxw)); margin-inline: auto; }
.narrow { width: min(100% - 2rem, 800px); }

.skip-link { position: absolute; left: -9999px; top: auto; }
.skip-link:focus { position: fixed; left: 1rem; top: 1rem; background: var(--accent-2); color: #000; padding: .5rem .75rem; border-radius: .5rem; z-index: 1000; }

.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in oklab, var(--bg), black 8%); border-bottom: 1px solid color-mix(in oklab, var(--surface), white 12%); backdrop-filter: blur(8px); }
.nav { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; padding: .75rem 0; }
.brand img { filter: drop-shadow(0 2px 4px rgba(0,0,0,.3)); }
.nav-links { display: flex; gap: 1rem; align-items: center; justify-self: end; }
.nav-links a { padding: .4rem .6rem; border-radius: .5rem; }
.nav-links a:hover { background: color-mix(in oklab, var(--surface), white 10%); text-decoration: none; }
.nav-toggle { display: none; background: transparent; border: 0; padding: .25rem; color: var(--text); }

.hero { padding: 6rem 0 4rem; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; margin: 0 0 .5rem; }
h1 { font-size: clamp(2rem, 4.5vw, 3.25rem); line-height: 1.1; margin: 0 0 1rem; }
.lead { font-size: 1.1rem; color: var(--muted); }
.cta-row { display: flex; gap: .75rem; margin-top: 1rem; flex-wrap: wrap; }

.section { padding: 4rem 0; }
.surface { background: linear-gradient(180deg, color-mix(in oklab, var(--surface), black 10%), var(--surface)); border-block: 1px solid color-mix(in oklab, var(--surface), white 10%); }

.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); }
.card { background: color-mix(in oklab, var(--surface), black 6%); border: 1px solid color-mix(in oklab, var(--surface), white 10%); padding: 1.25rem; border-radius: var(--radius); box-shadow: var(--shadow); }
.card h3 { margin-top: 0; }

.contact-form .grid { display: grid; gap: 1rem; grid-template-columns: 1fr 1fr; }
label { display: grid; gap: .35rem; font-weight: 600; }
input, textarea { width: 100%; padding: .8rem .9rem; border-radius: .7rem; border: 1px solid color-mix(in oklab, var(--surface), white 12%); background: color-mix(in oklab, var(--surface), black 4%); color: var(--text); }
input:focus, textarea:focus { outline: 2px solid var(--accent-2); outline-offset: 2px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; padding: .7rem 1rem; border-radius: .7rem; border: 1px solid color-mix(in oklab, var(--surface), white 15%); background: var(--accent-2); color: #071122; font-weight: 700; cursor: pointer; }
.btn:hover { filter: brightness(1.05); text-decoration: none; }
.btn-secondary { background: transparent; color: var(--text); border-color: color-mix(in oklab, var(--surface), white 20%); }

.site-footer { padding: 2.5rem 0; background: #07102a; border-top: 1px solid color-mix(in oklab, var(--surface), white 10%); }
.footer-grid { display: flex; gap: 2rem; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.muted { color: var(--muted); }

dialog { border: 0; background: color-mix(in oklab, var(--surface), black 6%); color: var(--text); border-radius: var(--radius); padding: 1rem; }
.dialog { max-width: 560px; }

@media (max-width: 640px) {
  .nav { grid-template-columns: 1fr auto; }
  .nav-links { display: none; position: absolute; right: 1rem; top: 64px; background: var(--surface); padding: .75rem; border-radius: .75rem; box-shadow: var(--shadow); }
  .nav-links.open { display: flex; flex-direction: column; min-width: 220px; }
  .nav-toggle { display: inline-flex; }
  .contact-form .grid { grid-template-columns: 1fr; }
}