:root{
  --mint:#a8e6cf;
  --mint-strong:#6fd8b5;
  --pink:#ffd1dc;
  --cream:#fffaf5;
  --ink:#2f2f2f;
  --soft:#6b6b6b;
  --white:#ffffff;
}
*{box-sizing:border-box}
html,body{height:100%}
img{max-width:100%;display:block}

body{
  margin:0;
  font-family:'Montserrat',system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,'Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol',sans-serif;
  color:var(--ink);
  background:linear-gradient(135deg,#ffdce8 0%,var(--cream) 40%,#d9f7ec 100%);
  overflow-x:hidden;
  opacity:1; transition:opacity .25s ease;
}
body.fade-out{opacity:.1}

/* Pastel overlay */
.pastel-film{position:fixed;inset:0;background:rgba(255,255,255,.35);backdrop-filter:blur(5px);pointer-events:none;z-index:0}

/* Floating flowers/leaves */
.floating{position:fixed;inset:0;pointer-events:none;z-index:0}
.floating img{position:absolute;opacity:.65;animation:float 7s ease-in-out infinite}
.float-1{top:8%;left:5%;width:90px;animation-delay:0s}
.float-2{bottom:6%;right:10%;width:140px;animation-delay:2s}
.float-3{top:62%;left:78%;width:110px;animation-delay:4s}
@keyframes float{0%{transform:translateY(0)}50%{transform:translateY(-14px)}100%{transform:translateY(0)}}

/* Header */
.header{
  position:fixed;
  top:0;left:0;right:0;
  height:64px;
  display:flex;
  align-items:center;
  gap:24px;
  padding:0 24px;
  background:var(--white);
  box-shadow:0 6px 18px rgba(0,0,0,.06);
  z-index:50;
}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-weight:600;filter:opacity(.9);transition:.2s}
.brand:hover{filter:opacity(1) drop-shadow(0 0 8px rgba(111,216,181,.35));transform:translateY(-1px)}
.brand img{height:28px;width:auto}

/* Language chooser */
.lang-shell{position:relative;z-index:1;min-height:100vh;display:flex;align-items:center;justify-content:flex-start;padding:0 10%;padding-top:64px}
.lang-box{max-width:520px}
.lang-title{font-size:clamp(32px,5vw,56px);margin:0 0 10px;letter-spacing:2px;color:#3a3a3a}
.lang-sub{margin:0 0 18px;color:var(--soft)}
.lang-actions{display:flex;gap:18px;flex-wrap:wrap}

/* Buttons */
.btn{
  text-decoration:none;
  color:#2f2f2f;
  background:#fff;
  padding:12px 18px;
  border:1px solid #e8e8e8;
  border-radius:30px;
  transition:.2s;
  font-weight:600;
  box-shadow:0 8px 18px rgba(168,230,207,.18)
}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(168,230,207,.28);background:#fafffd}

/* Hero section */
.hero{position:relative;z-index:1;padding:120px 10% 40px}
h1.title{margin:80px 0 12px;font-size:clamp(32px,5vw,56px);letter-spacing:2px;color:#3a3a3a}
p.slogan{margin:0 0 24px;color:var(--soft)}
.cta{display:flex;gap:20px;flex-wrap:wrap}

/* Navbar */
.nav{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:20px;
}
.nav a,.nav button{
  font:600 14px/1 'Montserrat',sans-serif;
  text-decoration:none;
  color:var(--ink);
  background:none;
  border:none;
  padding:10px 8px;
  cursor:pointer;
  position:relative;
}
.nav a::after,.nav button::after{
  content:"";
  position:absolute;
  left:8px;right:8px;bottom:6px;
  height:2px;
  background:linear-gradient(90deg,transparent,var(--mint),transparent);
  transform:scaleX(0);
  transition:transform .2s;
}
.nav a:hover::after,.nav button:hover::after{transform:scaleX(1)}

/* Dropdown fix (Programs + Support) */
.dropdown{position:relative}
.dropdown-menu{
  position:absolute;
  top:110%;
  left:0;
  min-width:220px;
  background:#fff;
  border:1px solid #eee;
  border-radius:10px;
  box-shadow:0 12px 28px rgba(0,0,0,.08);
  padding:8px;
  display:none; /* hidden by default */
  flex-direction:column;
  align-items:flex-start;
  z-index:100;
}
.dropdown.open .dropdown-menu{display:flex}
.dropdown-menu a{
  display:block;
  padding:10px 12px;
  border-radius:8px;
  color:var(--ink);
  white-space:nowrap;
}
.dropdown-menu a:hover{background:#f7fffb}

/* Prevent cut-off dropdown */
.header, .nav, .dropdown-menu {overflow:visible !important;}

/* Footer */
.footer{
  position:relative;
  z-index:1;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:32px 10%;
  color:var(--soft);
  flex-wrap:wrap;
}
.footer .frv{display:flex;gap:12px;align-items:center}
.footer .frv img{height:26px;width:auto}
.footer a{color:inherit;text-decoration:none}
.footer .copyright{flex-basis:100%;text-align:center;font-size:12px;opacity:.65;margin:-10px 0 16px}

/* Reveal animation */
.reveal{opacity:0;transform:translateY(16px);transition:.6s}
.reveal.in{opacity:1;transform:none}
/* Hiện menu khi JS thêm class .open */
.dropdown.open .dropdown-menu{ display:block; }