/* ========== Theme & Base ========== */
:root {
  --bg: #0a0a0a;
  --bg-alt: #111216;
  --text: #f6f6f6;
  --muted: #b8b8b8;
  --brand: #7dd3fc; /* sky-300 */
  --brand-strong: #0284c7; /* sky-600 */
  --surface: #1a1b20;
  --border: #2a2b31;
  --success: #10b981;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; color: var(--text); background: var(--bg);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Helvetica Neue", "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
}
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1160px, 92%); margin: 0 auto; }
.skip-link { position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.skip-link:focus { left: 1rem; top: 1rem; width: auto; height: auto; padding: .5rem .75rem; background: var(--brand-strong); color: #fff; border-radius: .5rem; }

/* ========== Buttons ========== */
.btn { display:inline-flex; align-items:center; justify-content:center; gap:.5rem; padding:.7rem 1rem; border-radius:.9rem; border:1px solid transparent; text-decoration:none; font-weight:600; }
.btn-primary { background: var(--brand-strong); color:#fff; }
.btn-primary:hover { filter: brightness(1.1); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); border:1px solid var(--border); }
.btn-ghost:hover { background: var(--surface); }
.btn-light { background:#fff; color:#0a0a0a; }
.btn-light:hover { filter: brightness(.95); }

/* ========== Header / Nav ========== */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 50; backdrop-filter: blur(10px); background: rgba(10,10,10,.85); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 1rem; }
.brand { display: flex; align-items: center; gap: .75rem; text-decoration: none; color: var(--text); }
.brand-mark { display:inline-grid; place-items:center; width: 40px; height: 40px; border-radius: .9rem; background: #fff; color: #0a0a0a; font-weight: 800; }
.brand-text { display: grid; line-height: 1.1; }
.brand-text small { color: var(--muted); font-size: .75rem; }

.nav-toggle { display:none; width:44px; height:44px; border:1px solid var(--border); border-radius:.75rem; background: var(--surface); }
.nav-toggle-bar { position: relative; width: 20px; height: 2px; margin: 0 auto; background: #fff; display: block; }
.nav-toggle-bar::before, .nav-toggle-bar::after { content:""; position:absolute; left:0; right:0; height:2px; background:#fff; }
.nav-toggle-bar::before { top:-6px; }
.nav-toggle-bar::after { top:6px; }

.nav { position: static; }
.nav ul { display:flex; align-items:center; gap: 1.25rem; list-style:none; margin:0; padding:0; white-space: nowrap; }
.nav a { color: var(--text); text-decoration:none; opacity:.85; }
.nav a:hover { opacity:1; }

/* ========== Hero ========== */
.hero { position: relative; min-height: 72vh; display:grid; width: 100vw; margin-top: 60px; }
.hero-slideshow { position:absolute; inset:0; overflow:hidden; }
.hero-img { position:absolute; inset:0; width:100vw; height:100%; object-fit: cover; object-position: center; opacity:.5; transition: opacity 800ms ease; }
.hero-img-b { opacity:0; }
.hero-img-a.is-visible, .hero-img-b.is-visible { opacity:.5; }
.hero-overlay { position:absolute; inset:0; background: linear-gradient(180deg, rgba(10,10,10,0.0) 0%, rgba(10,10,10,0.45) 70%, rgba(10,10,10,0.65) 100%); pointer-events:none; }
.hero-content { position:relative; z-index:1; display:grid; align-content:end; padding-block: 4rem; text-align:left; }
.hero h1 { font-size: clamp(2rem, 3.5vw, 3.5rem); line-height: 1.1; margin:0; }
.hero p { max-width: 60ch; font-size: clamp(1rem, 1.2vw, 1.25rem); color: var(--muted); margin:.75rem 0 0; }
.hero-cta { display:flex; gap:.75rem; margin-top:1rem; flex-wrap: wrap; }

/* ========== Sections & Cards ========== */
.section { padding: 4.5rem 0; }
.section-alt { background: var(--bg-alt); }
.grid-2 { display:grid; grid-template-columns: 1.2fr 1fr; gap: 2rem; align-items:start; }
.card { background: var(--surface); border:1px solid var(--border); border-radius: 1rem; padding: 1.25rem; }

.checklist { list-style: none; padding:0; margin: 1rem 0 0; }
.checklist li { position: relative; padding-left: 1.75rem; margin: .35rem 0; }
.checklist li::before { content:"✓"; position:absolute; left:.25rem; top:0; color: var(--success); }

/* Certifications */
.cert-grid { display:grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 1rem 0 0; }
.cert { background: var(--surface); border: 1px solid var(--border); border-radius: 1rem; padding: 1rem 1.25rem; }
.cert h3 { margin:.25rem 0 .25rem; font-size: 1.1rem; }
.cert p { margin:0; color: var(--muted); }

/* Aircraft */
.aircraft-grid { display:grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.aircraft { background: var(--surface); border: 1px solid var(--border); border-radius: 1rem; padding: 1rem 1.25rem; }
.aircraft h3 { margin:.25rem 0 .25rem; font-size: 1.1rem; }
.aircraft p { margin:0; color: var(--muted); }

/* Contact */
.contact-cards { display:grid; grid-template-columns: 1fr 1fr; gap: .75rem; margin: 1rem 0 0; }
.mini-card { background: var(--surface); border:1px solid var(--border); border-radius:.9rem; padding: .9rem 1rem; }

.contact-form { background: var(--surface); border:1px solid var(--border); border-radius: 1rem; padding: 1rem; display:grid; gap:.75rem; }
.contact-form label { display:grid; gap:.35rem; }
.contact-form input, .contact-form textarea { width:100%; background: #0f1014; border:1px solid var(--border); color: var(--text); border-radius:.7rem; padding:.75rem .9rem; font: inherit; }
.contact-form input:focus, .contact-form textarea:focus { outline:2px solid var(--brand-strong); outline-offset: 1px; }
.form-status { min-height: 1.25rem; color: var(--muted); margin: .25rem 0 0; }

/* Footer */
.site-footer { border-top:1px solid var(--border); background: #0c0d11; }
.footer-inner { display:flex; align-items:center; justify-content:space-between; gap:1rem; padding: 1.25rem 0; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--text); }

/* ========== Responsive ========== */
@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; }
  .cert-grid, .aircraft-grid, .contact-cards { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-flex; align-items:center; justify-content:center; }
  .nav { position: absolute; right: 4%; top: 64px; background: rgba(10,10,10,.95); border:1px solid var(--border); border-radius: 1rem; transform-origin: top right; transform: scale(.98); opacity:0; pointer-events:none; transition: opacity .2s ease, transform .2s ease; }
  .nav.open { opacity:1; transform: scale(1); pointer-events:auto; }
  .nav ul { flex-direction: column; align-items: flex-start; padding: 1rem; gap: .75rem; }
}

/* Utilities */
.section h2 { margin: 0 0 .75rem; font-size: clamp(1.5rem, 2.4vw, 2.2rem); }
.list-columns { columns: 2; gap: 1rem; margin: .5rem 0 0; }
@media (max-width: 700px) { .list-columns { columns: 1; } }