* { box-sizing: border-box; }

body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background:#fff;
  color:#111;
  line-height:1.4;
}

body.dark { background:#0f1115; color:#f3f4f6; }

.loadbar{
  position: fixed;
  top:0; left:0;
  height:3px;
  width:0%;
  background:#111;
  z-index: 999;
}
body.dark .loadbar{ background:#f3f4f6; }

.site-header{
  position: sticky;
  top:0;
  z-index: 10;
  background:#fff;
  border-bottom:1px solid #e6e6e6;
  padding:12px 16px;
  display:flex;
  align-items:center;
  gap:12px;
}
body.dark .site-header{ background:#0f1115; border-color:#2a2f3a; }

.brand{ font-weight:700; letter-spacing:.5px; }

.main-nav{
  margin-left:auto;
  display:flex;
  gap:10px;
}
.nav-link{
  text-decoration:none;
  color:inherit;
  padding:8px 10px;
  border-radius:10px;
}
.nav-link:hover{ background: rgba(0,0,0,.06); }
body.dark .nav-link:hover{ background: rgba(255,255,255,.08); }

.nav-link.is-active{
  outline: 1px solid rgba(0,0,0,.18);
}
body.dark .nav-link.is-active{
  outline: 1px solid rgba(255,255,255,.25);
}

.nav-toggle{
  margin-left:auto;
  display:none;
  border:1px solid #e6e6e6;
  background:transparent;
  color:inherit;
  padding:8px 10px;
  border-radius:12px;
  cursor:pointer;
}
body.dark .nav-toggle{ border-color:#2a2f3a; }

.chev{
  display:inline-block;
  transition: transform .2s ease;
}

.section{
  max-width:960px;
  margin:0 auto;
  padding:40px 16px;
  border-bottom:1px solid #e6e6e6;
}
body.dark .section{ border-color:#2a2f3a; }

.hero{ padding-top:28px; }

.muted{ opacity:.75; }
.btn-row{ display:flex; gap:10px; flex-wrap:wrap; margin-top:10px; }

.btn{
  margin-top:12px;
  padding:10px 14px;
  border-radius:12px;
  border:0;
  background:#111;
  color:#fff;
  cursor:pointer;
}
.btn:hover{ opacity:.9; }
body.dark .btn{ background:#f3f4f6; color:#0f1115; }

.btn-outline{
  background:transparent;
  color:#111;
  border:1px solid #111;
}
body.dark .btn-outline{ color:#f3f4f6; border-color:#f3f4f6; }

.card-grid{
  display:grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap:12px;
  margin-top:14px;
}

.js-reveal{
  opacity:0;
  transform: translateY(10px);
}

.js-card{
  opacity:0;
  transform: translateY(12px);
}

.flip-card{
  perspective: 1000px;
  cursor: pointer;
}

.flip-inner{
  position: relative;
  width: 100%;
  height: 120px;
  transition: transform .4s;
  transform-style: preserve-3d;
}

.flip-card.flipped .flip-inner{
  transform: rotateY(180deg);
}

.flip-front,
.flip-back{
  position: absolute;
  inset: 0;
  display:flex;
  align-items:center;
  justify-content:center;
  border:1px solid #e6e6e6;
  border-radius:14px;
  backface-visibility: hidden;
}

body.dark .flip-front,
body.dark .flip-back{
  border-color:#2a2f3a;
}

.flip-back{
  transform: rotateY(180deg);
}

.accordion{
  margin-top:12px;
  border:1px solid #e6e6e6;
  border-radius:14px;
  overflow:hidden;
}
body.dark .accordion{ border-color:#2a2f3a; }

.acc-btn{
  width:100%;
  text-align:left;
  padding:14px 12px;
  border:0;
  cursor:pointer;
  background: rgba(0,0,0,.03);
  font-weight:600;
}
body.dark .acc-btn{ background: rgba(255,255,255,.06); color:inherit; }

.acc-panel{ display:none; padding:12px; }

.contact .hint{ display:block; margin-top:8px; opacity:.7; }

@media (max-width: 700px){
  .nav-toggle{ display:inline-block; }
  .main-nav{
    width:100%;
    margin-left:0;
    display:none;
    flex-direction:column;
    gap:0;
    padding-top:8px;
  }
  .site-header{ flex-wrap:wrap; }

  .card-grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
}