:root{
  --green:#0B6B3A;
  --red:#D81F26;
  --bg:#FFFFFF;
  --surface:#F4F7F5;
  --text:#102018;
  --muted:#5B6B62;
  --border:#DCE5DF;

  --radius:16px;
  --shadow: 0 10px 30px rgba(16, 32, 24, 0.08);
  --shadow-soft: 0 6px 18px rgba(16, 32, 24, 0.06);

  --container:1120px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.55;
}

img{max-width:100%; height:auto; display:block}
a{color:inherit}
.muted{color:var(--muted)}
.mono{font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;}
.micro{font-size:0.92rem; color:var(--muted)}
.h3{font-size:1.15rem; margin:0 0 8px}

.skip-link{
  position:absolute;
  left:-999px;
  top:auto;
  width:1px;
  height:1px;
  overflow:hidden;
}
.skip-link:focus{
  left:16px;
  top:16px;
  width:auto;
  height:auto;
  padding:10px 12px;
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:10px;
  box-shadow:var(--shadow-soft);
  z-index:9999;
}

.container{
  max-width:var(--container);
  margin:0 auto;
  padding:0 18px;
}

.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(255,255,255,0.9);
  backdrop-filter:saturate(1.2) blur(10px);
  border-bottom:1px solid var(--border);
}

.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:12px 0;
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  min-width:260px;
}
.brand__logo{
  border-radius:12px;
  box-shadow:var(--shadow-soft);
}
.brand__text{display:flex; flex-direction:column; gap:2px}
.brand__name{font-weight:800; letter-spacing:-0.2px}
.brand__tagline{font-size:0.92rem; color:var(--muted)}

.nav__toggle{
  display:none;
  background:transparent;
  border:1px solid var(--border);
  padding:10px 12px;
  border-radius:12px;
  cursor:pointer;
}
.nav__toggle:focus{outline:3px solid rgba(11,107,58,0.25); outline-offset:2px;}
.nav__toggle-label{font-weight:650}
.nav__toggle-icon{
  display:inline-block;
  width:18px;
  height:2px;
  background:var(--text);
  vertical-align:middle;
  margin-left:10px;
  position:relative;
}
.nav__toggle-icon::before,
.nav__toggle-icon::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:var(--text);
}
.nav__toggle-icon::before{top:-6px}
.nav__toggle-icon::after{top:6px}

.nav__menu{
  display:flex;
  align-items:center;
  gap:10px;
}
.nav__link{
  text-decoration:none;
  padding:10px 10px;
  border-radius:12px;
  color:var(--muted);
}
.nav__link:hover{background:var(--surface); color:var(--text)}
.nav__link:focus{outline:3px solid rgba(11,107,58,0.25); outline-offset:2px;}

.nav__cta{
  text-decoration:none;
  padding:10px 14px;
  border-radius:999px;
  background:var(--green);
  color:white;
  font-weight:700;
  box-shadow:var(--shadow-soft);
}
.nav__cta:hover{filter:brightness(1.05)}
.nav__cta:focus{outline:3px solid rgba(11,107,58,0.25); outline-offset:2px;}

.hero{
  padding:34px 0 26px;
  background:
    radial-gradient(1000px 500px at 12% 20%, rgba(11,107,58,0.12), transparent 55%),
    radial-gradient(900px 480px at 80% 30%, rgba(216,31,38,0.10), transparent 55%),
    linear-gradient(#FFFFFF, #FFFFFF);
}
.hero__grid{
  display:grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap:22px;
  align-items:start;
}
.pill{
  display:inline-block;
  padding:8px 12px;
  border-radius:999px;
  background:rgba(11,107,58,0.09);
  border:1px solid rgba(11,107,58,0.18);
  color:var(--green);
  font-weight:700;
  margin:0 0 14px;
}
h1{
  margin:0 0 10px;
  font-size: clamp(2rem, 3.2vw, 3rem);
  line-height:1.12;
  letter-spacing:-0.6px;
}
.lead{
  font-size:1.12rem;
  color:var(--muted);
  margin:0 0 18px;
}
.hero__actions{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin:0 0 10px;
}

.hero__card{
  position:relative;
  background:rgba(255,255,255,0.85);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:18px;
  overflow:hidden;
}
.hero__watermark{
  position:absolute;
  right:-40px;
  top:-40px;
  width:220px;
  height:220px;
  background-image:url("../logo/vnbd.png");
  background-size:contain;
  background-repeat:no-repeat;
  opacity:0.07;
  transform:rotate(10deg);
  pointer-events:none;
}
.note{
  margin-top:14px;
  padding:12px;
  border-radius:14px;
  border:1px solid rgba(11,107,58,0.18);
  background:rgba(11,107,58,0.06);
}
.note strong{color:var(--green)}

.stats{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:10px;
  margin-top:14px;
}
.stat{
  padding:10px;
  border:1px solid var(--border);
  border-radius:14px;
  background:var(--surface);
}
.stat__num{
  font-weight:900;
  font-size:1.35rem;
  color:var(--green);
  letter-spacing:-0.3px;
}
.stat__label{
  font-size:0.92rem;
  color:var(--muted);
}

.section{padding:48px 0}
.section--soft{background:var(--surface)}
.section__head{margin-bottom:16px}
.section__head h2{margin:0 0 6px; letter-spacing:-0.3px}
.section__head p{margin:0}

.grid2{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:16px;
}
.cards3{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:14px;
}

.card{
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow-soft);
  padding:16px;
}
.card--outline{
  background:transparent;
  box-shadow:none;
}
.card h3{margin:0 0 10px}
.card p{margin:0}

.list{
  margin:0;
  padding-left:18px;
  color:var(--muted);
}
.list li{margin:8px 0}

.timeline{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:14px;
}
.timeline__item{
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
  box-shadow:var(--shadow-soft);
}
.timeline__item h3{margin:0 0 8px}
.timeline__item p{margin:0; color:var(--muted)}

.callout{
  margin-top:16px;
  border-color: rgba(216,31,38,0.18);
  background: rgba(216,31,38,0.05);
}
.callout h3{color:var(--text)}

.join__actions{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin-top:12px;
}

.notice{
  margin-top:12px;
  padding:12px;
  border-radius:14px;
  border:1px solid rgba(216,31,38,0.18);
  background: rgba(216,31,38,0.05);
  display:flex;
  flex-direction:column;
  gap:4px;
}
.notice strong{color:var(--text)}

.field{
  display:flex;
  flex-direction:column;
  gap:6px;
  margin-bottom:12px;
}
.field span{font-weight:700; font-size:0.95rem}
input, textarea{
  border:1px solid var(--border);
  border-radius:14px;
  padding:11px 12px;
  font:inherit;
  background:white;
}
input:focus, textarea:focus{
  outline:3px solid rgba(11,107,58,0.25);
  outline-offset:2px;
}

.form__actions{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  border-radius:999px;
  padding:11px 14px;
  border:1px solid var(--border);
  background:var(--bg);
  text-decoration:none;
  cursor:pointer;
  font-weight:750;
}
.btn:focus{outline:3px solid rgba(11,107,58,0.25); outline-offset:2px;}
.btn--primary{
  background:var(--green);
  border-color:rgba(11,107,58,0.45);
  color:white;
  box-shadow:var(--shadow-soft);
}
.btn--primary:hover{filter:brightness(1.05)}
.btn--ghost{
  background:transparent;
}
.btn--ghost:hover{background:rgba(11,107,58,0.08); border-color:rgba(11,107,58,0.25)}

.footer{
  border-top:1px solid var(--border);
  padding:22px 0;
  background:rgba(255,255,255,0.9);
}
.footer__grid{
  display:grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap:16px;
  align-items:start;
}
.footer__brand{
  display:flex;
  gap:12px;
  align-items:center;
}
.footer__logo{
  border-radius:12px;
  border:1px solid var(--border);
  background:white;
}
.footer__name{font-weight:900}
.footer__muted{color:var(--muted); font-size:0.95rem}
.footer__links{
  display:flex;
  flex-direction:column;
  gap:8px;
}
.footer__links a{
  color:var(--muted);
  text-decoration:none;
}
.footer__links a:hover{color:var(--text); text-decoration:underline}
.footer__fineprint p{margin:0 0 8px}

.toast{
  position:fixed;
  left:50%;
  bottom:18px;
  transform:translateX(-50%);
  background:rgba(16,32,24,0.92);
  color:white;
  padding:10px 12px;
  border-radius:14px;
  max-width:min(560px, calc(100% - 24px));
  box-shadow:var(--shadow);
  opacity:0;
  pointer-events:none;
  transition:opacity 180ms ease;
}
.toast.show{opacity:1}

@media (max-width: 980px){
  .hero__grid{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(3, 1fr)}
  .timeline{grid-template-columns:1fr}
}

@media (max-width: 820px){
  .cards3{grid-template-columns:1fr}
  .grid2{grid-template-columns:1fr}
  .footer__grid{grid-template-columns:1fr}
  .brand__tagline{display:none}

  .nav__toggle{display:inline-flex; align-items:center;}
  .nav__menu{
    display:none;
    position:absolute;
    left:18px;
    right:18px;
    top:70px;
    background:var(--bg);
    border:1px solid var(--border);
    border-radius:18px;
    box-shadow:var(--shadow);
    padding:12px;
    flex-direction:column;
    align-items:stretch;
  }
  .nav__menu.open{display:flex}
  .nav__link{padding:12px}
  .nav__cta{justify-content:center}
}