/* site.css – Header & Footer (đã scope trong #site-header / #site-footer)
   Không ảnh hưởng và không bị ảnh hưởng bởi CSS của trang. */

/* ===== Biến màu + nền chung (chỉ có hiệu lực trong header/footer) ===== */
#site-header,
#site-footer{
  --green:#1E6B3C;
  --mint:#EAF4EC;
  --yellow:#F6C90E;
  --yellow-soft:#FFF6CC;
  --bg:#FFFFFF;
  --text:#111111;
  --line:#D8E4DB;
  --black:#111111;
  font:400 16px/1.65 "Be Vietnam Pro",system-ui,"Segoe UI",Arial,sans-serif;
  color:var(--text);
}
#site-header *,
#site-footer *{box-sizing:border-box}
#site-header a,
#site-footer a{color:inherit;text-decoration:none}
#site-header p,
#site-footer p{max-width:none}
#site-header ul,
#site-footer ul{list-style:none;margin:0;padding:0}

/* ===== HEADER ===== */
/* sticky đặt trên wrapper để dính được suốt trang */
#site-header{
  position:sticky;
  top:0;
  z-index:100;
  padding-top:env(safe-area-inset-top,0px);
  background:var(--bg);
}
#site-header .hdr{
  position:relative;
  background:var(--bg);
  border-bottom:3px solid var(--yellow);
}
#site-header .wrap{
  max-width:1120px;
  margin:0 auto;
  padding:0 20px;
  height:62px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}

#site-header .brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  font-size:17px;
  color:var(--black);
}
#site-header .brand i{
  display:inline-block;
  width:12px;
  height:22px;
  background:var(--green);
  border-radius:6px;
  box-shadow:0 0 0 3px var(--yellow);
}

#site-header .nav{display:flex;gap:4px;align-items:center}
#site-header .nav a,
#site-header .nav button{
  color:var(--text);
  background:none;
  border:0;
  font:inherit;
  line-height:1.4;
  padding:8px 12px;
  border-radius:6px;
  cursor:pointer;
}
#site-header .nav a:hover,
#site-header .nav button:hover{background:var(--mint)}
#site-header .nav a.on{
  background:var(--yellow-soft);
  box-shadow:inset 0 -3px 0 var(--green);
  border-radius:6px 6px 0 0;
}

/* nút CTA trong menu (class "btn") */
#site-header .nav .btn{
  display:inline-block;
  padding:9px 18px;
  margin:0 0 0 6px;
  border:2px solid var(--black);
  border-radius:6px;
  background:var(--yellow);
  color:var(--black);
  font-weight:700;
  transform:none;
}
#site-header .nav .btn:hover{background:var(--yellow);filter:brightness(.95);transform:none}

/* dropdown */
#site-header .dd{position:relative}
#site-header .dd-menu{
  display:none;
  position:absolute;
  left:0;
  top:100%;
  z-index:110;
  min-width:320px;
  padding:6px;
  background:var(--bg);
  border:1px solid var(--line);
  border-top:3px solid var(--green);
  border-radius:0 0 8px 8px;
  box-shadow:0 12px 30px rgba(0,0,0,.15);
}
#site-header .dd:hover .dd-menu,
#site-header .dd.open .dd-menu,
#site-header .dd:focus-within .dd-menu{display:block}
#site-header .dd-menu a{display:block}

#site-header .burger{display:none}

/* ===== FOOTER ===== */
#site-footer .ftr{
  background:var(--black);
  color:#E8EEE9;
  padding:44px 0 20px;
  border-top:4px solid var(--yellow);
}
#site-footer .wrap{max-width:1120px;margin:0 auto;padding:0 20px}
#site-footer .cols{
  display:grid;
  grid-template-columns:1.3fr 1.2fr 1fr;
  gap:32px;
}
#site-footer h3{
  margin:0 0 .6em;
  font-family:inherit;
  font-size:15px;
  font-weight:700;
  line-height:1.25;
  color:var(--yellow);
}
#site-footer p{margin:0 0 .8em;color:#E8EEE9}
#site-footer li{margin-bottom:6px}
#site-footer a:hover{color:var(--yellow);text-decoration:underline}
#site-footer .copy{
  margin-top:28px;
  padding-top:14px;
  border-top:1px solid #333;
  font-size:13px;
  color:#A9B4AD;
}

/* ===== Focus & motion ===== */
#site-header :focus-visible,
#site-footer :focus-visible{outline:3px solid var(--yellow);outline-offset:2px}
#site-header .hdr :focus-visible{outline-color:var(--green)}

@media(prefers-reduced-motion:reduce){
  #site-header *,
  #site-footer *{transition:none!important}
}

/* ===== MOBILE (900px, khớp với trang) ===== */
@media(max-width:900px){
  #site-header .burger{
    display:block;
    background:none;
    border:2px solid var(--green);
    color:var(--text);
    border-radius:6px;
    padding:6px 10px;
    font:inherit;
    cursor:pointer;
  }
  #site-header .nav{
    display:none;
    position:absolute;
    left:0;
    right:0;
    top:100%;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:8px 20px 16px;
    background:var(--bg);
    border-bottom:3px solid var(--yellow);
    box-shadow:0 12px 24px rgba(0,0,0,.1);
  }
  #site-header .nav.open{display:flex}
  #site-header .nav .btn{margin:8px 0 0;text-align:center}
  #site-header .dd-menu{
    position:static;
    display:block;
    min-width:0;
    margin-left:12px;
    padding:0;
    background:transparent;
    border:0;
    border-left:3px solid var(--yellow);
    border-radius:0;
    box-shadow:none;
  }
  #site-footer .cols{grid-template-columns:1fr;gap:28px}
}