/* ───────────────────────────────
   Global palette – light scheme
──────────────────────────────── */
:root{
  --bg          : #e8f1fb;
  --text        : #0a0a0a;
  --card-bg     : #ffffff;
  --primary     : #064f88;
  --primary-d   : #05396b;     /* hover / active */
  --link        : #064f88;
  --link-hover  : #032b50;

  /* tables */
  --tbl-border  : #b9c7d6;
  --tbl-row-odd : #f4f8fd;
}

/* ─────────── Dark-mode overrides ─────────── */
body.dark{
  --bg        : #121212;
  --text      : #f5f5f5;
  --card-bg   : #1e1e1e;
  --link      : #70a8ff;
  --link-hover: #a5c6ff;

  --tbl-border  : #3c3c3c;
  --tbl-row-odd : #1a1a1a;
}

/* ─────────── Base / reset ─────────── */
*,*::before,*::after{box-sizing:border-box;}

body{
  margin:0;
  font-family:'Inter','Segoe UI',sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  transition:background .3s,color .3s;
}

h1,h2,h3,h4{line-height:1.25;margin:.1em 0 .6em}
h2{font-size:1.35rem;}
h3{font-size:1.15rem;}

img,iframe,embed{max-width:100%;display:block;border-radius:8px}

a{
  color:var(--link);
  text-underline-offset:2px;
  transition:color .15s;
}
a:hover{color:var(--link-hover)}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}

/* ─────────── Header / nav ─────────── */
.site-header{
  background:var(--primary);
  color:#fff;
}
.site-header .container{
  padding:1rem 0;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:1.2rem;
}
.site-title{margin:0;font-size:1.4rem}

.main-nav ul{
  margin:0;
  padding:0;
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:1rem;
}
.main-nav a,
#themeToggle{
  color:#fff;
  background:none;
  border:none;
  font-weight:500;
  font-size:1.05rem;
  padding:.35rem .7rem;
  border-radius:4px;
  text-decoration:none;
  cursor:pointer;
  transition:background .2s;
}
.main-nav a:hover,
#themeToggle:hover{background:rgba(255,255,255,.18)}
.main-nav a[aria-current]{background:rgba(255,255,255,.28)}

/* ─────────── Layout helpers ─────────── */
.container{width:min(92%,1180px);margin-inline:auto}
main{padding:2rem}

/* ─────────── Cards ─────────── */
.card{
  background:var(--card-bg);
  margin-block:1.75rem;
  padding:1.8rem 1.5rem;
  border-radius:10px;
  box-shadow:0 2px 8px rgba(0,0,0,.07);
  transition:transform .25s cubic-bezier(.4,0,.2,1),box-shadow .25s;
}
.card:hover{
  transform:translateY(-3px);
  box-shadow:0 6px 16px rgba(0,0,0,.14);
}
.card > summary{
  list-style:none;
  cursor:pointer;
  user-select:none;
  display:flex;
  align-items:center;
  gap:.4rem;
}
.card > summary::-webkit-details-marker{display:none;}
.card > summary::before{
  content:'▸';
  transition:transform .3s;
}
details[open]>summary::before{transform:rotate(90deg)}

/* ─────────── Buttons ─────────── */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  font-weight:600;
  padding:.58rem 1.2rem;
  border-radius:6px;
  cursor:pointer;
  line-height:1;
  transition:background .2s,border-color .2s,color .2s;
}
.btn.primary{background:var(--primary);color:#fff;}
.btn.primary:hover{background:var(--primary-d);}
.btn.outline{
  background:none;
  border:2px solid var(--primary);
  color:var(--primary);
}
.btn.outline:hover{background:var(--primary);color:#fff;}
.cta-row{display:flex;flex-wrap:wrap;gap:1rem;margin-top:1.2rem}

/* ─────────── Spec grid (images) ─────────── */
.spec-grid{
  --gap:1.8rem;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:var(--gap);
  margin-top:1rem;
}
.spec-grid figure{
  flex:1 1 clamp(140px,28%,240px);
  margin:0;
  text-align:center;
}
.spec-grid figure img{
  width:100%;
  aspect-ratio:1/1;
  object-fit:contain;
}
figcaption{
  margin-top:.45rem;
  font-size:.83rem;
  color:var(--text);
}

/* ─────────── Video grid (YouTube) ─────────── */
.video-grid{
  --gap:1.2rem;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:var(--gap);
  align-items:start;
  margin-top:1rem;
}
.video-grid iframe{
  width:100%;
  aspect-ratio:16/9;
  border:none;
}

/* ─────────── Tables ─────────── */
.table-scroll{
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.data-table{
  border-collapse:collapse;
  width:100%;
  min-width:520px;
  font-size:.9rem;
}
.data-table thead{
  position:sticky;
  top:0;
  background:var(--card-bg);
}
.data-table th,
.data-table td{
  border:1px solid var(--tbl-border);
  padding:.45rem .6rem;
  text-align:left;
}
.data-table tbody tr:nth-child(odd){
  background:var(--tbl-row-odd);
}
.data-table.small th,
.data-table.small td{font-size:.8rem;padding:.38rem .5rem}

/* ─────────── PDF embed (large view) ─────────── */
.pdf-embed{
  width:100%;
  height:650px;
  border:none;
  border-radius:8px;
  box-shadow:0 0 6px rgba(0,0,0,.08);
  margin-top:.9rem;
}

/* ─────────── Utility lists ─────────── */
.tight{margin:.9rem 0 0;padding-left:1.25rem}
.tight li{margin:.28rem 0}

/* ─────────── Footer ─────────── */
.site-footer{
  background:var(--primary);
  color:#fff;
  text-align:center;
  padding:1rem;
  font-size:.88rem;
}

/* ─────────── Print tweaks ─────────── */
@media print{
  body{background:#fff;color:#000}
  .card{box-shadow:none}
  a::after{content:" ("attr(href) ")";font-size:.75em}
}