* { 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 600px at 10% -10%, #1d3353 0%, transparent 60%) no-repeat,
              linear-gradient(180deg, var(--bg) 0%, #0a1020 100%);
}

img { max-width: 100%; display: block; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header / Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  background: rgba(10, 16, 32, .6);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 70px;
}
.brand img { height: 66px; width: 66px; margin: 0; object-fit: contain; }
.nav-links { display: none; gap: 20px; align-items: center; }
.nav-links a { color: var(--text); text-decoration: none; }
.nav-links .btn { margin-left: 8px; }
.nav-toggle { display: inline-flex; flex-direction: column; gap: 4px; background: none; border: 0; cursor: pointer; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); display: block; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 16px; border-radius: 999px; font-weight: 600; text-decoration: none;
  border: 1px solid var(--border); color: var(--text);
}
.btn-primary { background: var(--primary-600); border-color: var(--primary-600); }
.btn-primary:hover { filter: brightness(1.1); }
.btn-ghost { background: transparent; }
.btn-ghost:hover { background: rgba(255,255,255,.06); }

/* Hero */
.hero { position: relative; }
.hero-inner {
  display: grid; gap: 32px;
  grid-template-columns: 1fr; padding: 80px 0 40px;
}
.hero-copy h1 { font-size: clamp(32px, 5vw, 56px); line-height: 1.05; margin: 0 0 16px; }
.accent { color: var(--accent); }
.hero-copy p { color: var(--muted); max-width: 60ch; }
.hero-cta { margin-top: 20px; display: flex; gap: 12px; flex-wrap: wrap; }
.hero-art { display: flex; align-items: center; justify-content: center; }
.hero-art img { width: min(360px, 80%); filter: drop-shadow(var(--shadow)); }
.hero-bg {
  position: absolute; inset: 0;
  background: url('../assets/RDTevo_logo_dark_transparent.png') center/contain no-repeat;
  opacity: .02; pointer-events: none;
}

/* Sections */
.section { padding: 64px 0; }
.section.alt { background: var(--panel); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-title { font-size: 28px; margin: 0 0 24px; }

/* Cards / Grid */
.grid.cards {
  display: grid; gap: 16px; grid-template-columns: 1fr;
}
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; }
.card p { margin: 0; color: var(--muted); }

/* Two column */
.two-col { display: grid; grid-template-columns: 1fr; gap: 24px; align-items: center; }
.about-img { width: 260px; margin-inline: auto; }

/* Steps */
.steps {
  list-style: none; padding: 0; margin: 0; display: grid; gap: 12px;
}
.steps li {
  display: flex; align-items: center; gap: 12px;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px;
}
.steps li span {
  width: 28px; height: 28px; display: inline-grid; place-items: center; border-radius: 999px; background: var(--primary-600);
  font-weight: 700;
}

/* Contact form */
.contact-form { display: grid; gap: 12px; }
.form-row { display: grid; grid-template-columns: 1fr; gap: 12px; }
label { display: grid; gap: 6px; font-weight: 600; }
input, textarea {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--border); background: #0b1426; color: var(--text);
}
input:focus, textarea:focus { outline: 2px solid var(--primary); }
.form-actions { display: flex; gap: 10px; align-items: center; }
.contact-meta { margin-top: 12px; color: var(--muted); display: flex; gap: 8px; flex-wrap: wrap; }

/* Contact directory */
.contact-cards {
  display: grid; gap: 12px; margin: 16px 0 24px;
  grid-template-columns: 1fr;
}
.contact-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--border);
  color: var(--text); text-decoration: none;
}
.contact-item:hover { background: #0f172a; }
.ci-label { color: var(--muted); }
.ci-value { font-weight: 600; }
.legal-note { margin-top: 16px; color: var(--muted); font-size: .9rem; }

/* Footer */
.site-footer { padding: 32px 0; background: #0a1120; border-top: 1px solid var(--border); }
.footer-inner { display: grid; gap: 16px; align-items: center; text-align: center; }
.footer-brand img { width: 258px; margin: -50px auto -50px; }  /* larger footer logo */
.footer-nav { display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.footer-nav a { text-decoration: none; color: var(--text); padding: 6px 2px; } /* breathing room */

/* Larger screens */
@media (min-width: 768px) {
  .nav-links { display: flex; }
  .nav-toggle { display: none; }
  .hero-inner { grid-template-columns: 1.2fr 1fr; padding: 120px 0 70px; }
  .grid.cards { grid-template-columns: repeat(2, 1fr); }
  .contact-cards { grid-template-columns: repeat(3, 1fr); }
  .two-col { grid-template-columns: 1.2fr 1fr; }
  .form-row { grid-template-columns: 1fr 1fr; }

  .brand img, .logo-nav { height: 128px; object-fit: contain; margin: -20px 0 -20px 0; }        /* even larger on desktop */
  .footer-nav { gap: 28px; }                      /* more spacing on desktop */
}

/* Utilities */
.checklist { padding-left: 18px; color: var(--muted); }
.checklist li { margin-bottom: 8px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }