/* style.css - Unified responsive styles (Style A: vàng + xanh) */
:root{
  --brand-yellow: #cf9912;
  --brand-yellow-2: #eac363;
  --brand-blue: #1e3a8a;
  --bg: #f0f8ff;
  --card-bg: #fffbea;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: #111;
  margin:0;
  padding:0;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}

/* Header */
header{
  background: linear-gradient(90deg,var(--brand-yellow), #d9a73a);
  color:#fff;
  padding:18px 16px;
  text-align:center;
  position:relative;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
header h1{margin:0;font-size:20px;letter-spacing:0.6px}
header img.zoom-img{width:44px;position:absolute;left:14px;top:10px;cursor:pointer;transition:transform .25s ease}

/* Nav */
nav{
  background: var(--brand-yellow-2);
  padding:10px 14px;
  display:flex;
  justify-content:center;
  gap:10px;
  flex-wrap:wrap;
  box-shadow: inset 0 -1px 0 rgba(0,0,0,0.02);
}
nav a{
  display:inline-block;
  text-decoration:none;
  color:var(--brand-blue);
  padding:10px 14px;
  border-radius:8px;
  font-weight:700;
  transition: transform .2s ease, box-shadow .2s ease, background-color .2s ease;
  background: rgba(255,255,255,0.45);
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}
nav a:hover{transform:translateY(-3px) rotate(-1deg); background: #fff; box-shadow: 0 6px 18px rgba(0,0,0,0.08)}

/* Section info */
.info{
  display:flex;
  gap:20px;
  align-items:center;
  margin:18px auto;
  max-width:1100px;
  background: var(--card-bg);
  padding:20px;
  border-radius:14px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.03);
  transition: transform .25s ease, box-shadow .25s ease;
}
.info:hover{transform:translateY(-4px); box-shadow: 0 18px 36px rgba(0,0,0,0.06)}

/* Images in card */
.info img{
  width:260px;
  max-width:40%;
  border-radius:10px;
  transition: transform .35s ease, box-shadow .35s ease;
}
.info img:hover{transform:scale(1.04)}

/* Content inside info */
.info > div{flex:1}
.info h2{color:var(--brand-yellow); margin-top:0; font-size:20px}
.info p{margin:8px 0}

/* List styles */
ul, ol{margin:10px 0 10px 20px;padding:0}
li{background:#fff3cd;border:1px solid #e0b800;border-radius:10px;padding:10px;margin-bottom:8px}

/* Video responsive */
.video-container{position:relative;width:100%;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:10px}
.video-container iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0}

/* Footer */
#foot, footer{background: linear-gradient(90deg,var(--brand-yellow), #d9a73a); color:#fff; text-align:center; padding:12px; margin-top:18px;}

/* Small helper */
.container{max-width:1100px;margin:0 auto;padding:0 16px}

/* Responsive rules */

/* Large tablet */
@media (max-width: 992px) {
  .info{flex-wrap:wrap}
  .info img{max-width:45%}
  nav a{font-size:15px;padding:8px 12px}
}

/* Mobile: Option 2 - menu as large stacked buttons */
@media (max-width: 600px){
  header h1{font-size:18px;padding-right:48px} /* room for home icon */
  nav{flex-direction:column;align-items:stretch;padding:8px 10px;gap:8px}
  nav a{display:block;width:100%;padding:12px 14px;border-radius:10px;font-size:18px;text-align:center}
  .info{flex-direction:column;text-align:center;padding:16px;margin:12px;border-radius:12px}
  .info img{width:100%;max-width:320px;margin:0 auto}
  .info > div{width:100%}
  .info h2{font-size:20px}
  li{font-size:16px}
  body{font-size:16px}
}

/* Accessibility focus */
a:focus{outline:3px solid rgba(30,58,138,0.18);outline-offset:3px}

/* small screens video tweak */
@media (max-width:420px){
  .video-container{padding-bottom:60%}
}