:root{
  --green:#1B4332; --green-2:#2D6A4F; --green-3:#40916C;
  --gold:#D4AF37; --gold-2:#C5A059;
  --cream:#F8F7F2; --ink:#1F2421; --muted:#5B6660;
  --shadow:0 4px 20px rgba(27,67,50,.12);
  --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Sarabun',system-ui,sans-serif;color:var(--ink);background:var(--cream);line-height:1.75;font-size:17px}
h1,h2,h3,h4{font-family:'Trirong',serif;line-height:1.35;color:var(--green)}
a{color:var(--green-2);text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}

/* ---------- header ---------- */
.topbar{background:var(--green);color:#fff;font-size:14px}
.topbar .wrap{display:flex;justify-content:space-between;gap:12px;padding:6px 20px;flex-wrap:wrap}
.topbar span{opacity:.85}
nav.main{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.97);backdrop-filter:blur(8px);border-bottom:3px solid var(--gold);box-shadow:0 2px 12px rgba(0,0,0,.06)}
nav.main .wrap{display:flex;align-items:center;gap:14px;padding:10px 20px}
nav.main img.logo{width:52px;height:52px;object-fit:contain}
.brand b{display:block;font-family:'Trirong',serif;color:var(--green);font-size:18px;line-height:1.2}
.brand small{color:var(--muted);font-size:12.5px}
.menu{margin-left:auto;display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.menu a{padding:8px 14px;border-radius:999px;font-weight:600;font-size:15px;color:var(--green);transition:.2s}
.menu a:hover,.menu a.active{background:var(--green);color:#fff}
.burger{display:none;margin-left:auto;background:none;border:1.5px solid var(--green);color:var(--green);border-radius:10px;padding:8px 12px;font-size:18px;cursor:pointer}

/* ---------- hero (แบนเนอร์ภาพจริง) ---------- */
.hero{background:linear-gradient(180deg,#123024,var(--green));color:#fff;text-align:center}
.hero .banner{width:100%;max-width:1600px;margin:0 auto;display:block}
.hero .inner{padding:26px 20px 46px;max-width:900px;margin:0 auto}
.hero h1{color:#fff;font-size:clamp(22px,3.4vw,32px);margin-bottom:6px}
.hero .sub{color:var(--gold);font-size:clamp(15px,2vw,19px);font-family:'Trirong',serif}
.hero .only-sm{display:none}
.hero .quote{font-size:clamp(16px,2vw,21px);font-style:italic;opacity:.95;color:#F2E7C4}
.hero .cta{margin-top:24px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 26px;border-radius:999px;font-weight:700;border:2px solid transparent;cursor:pointer;font-family:inherit;font-size:16px}
.btn-gold{background:var(--gold);color:#3B2F0B}
.btn-gold:hover{background:#e6c250}
.btn-ghost{border-color:rgba(255,255,255,.7);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.15)}

/* ---------- sections ---------- */
section{padding:70px 0}
.sec-head{text-align:center;max-width:760px;margin:0 auto 42px}
.sec-head .kicker{color:var(--gold-2);font-weight:700;letter-spacing:2px;font-size:14px;text-transform:uppercase}
.sec-head h2{font-size:clamp(24px,3.4vw,36px);margin:6px 0 12px}
.sec-head h2::after{content:'';display:block;width:70px;height:3px;background:var(--gold);margin:14px auto 0;border-radius:2px}
.sec-head p{color:var(--muted)}
.alt{background:#fff}

/* ---------- cards ---------- */
.grid{display:grid;gap:26px}
.g3{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.g2{grid-template-columns:repeat(auto-fit,minmax(340px,1fr))}
.card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid #E8E6DC;transition:.25s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-6px);box-shadow:0 12px 34px rgba(27,67,50,.2)}
.card .thumb{aspect-ratio:16/10;background:var(--green-3);position:relative;overflow:hidden}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.card .no{position:absolute;top:12px;left:12px;background:var(--gold);color:#3B2F0B;font-weight:800;border-radius:8px;padding:3px 12px;font-size:14px;font-family:'Trirong',serif}
.card .body{padding:20px 22px 24px;flex:1;display:flex;flex-direction:column}
.card h3{font-size:21px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15.5px;flex:1}
.card .go{margin-top:16px;font-weight:700;color:var(--green-2)}

/* ---------- 3 rings ---------- */
.rings{display:grid;gap:22px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.ring{background:#fff;border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);border-top:5px solid var(--gold)}
.ring h4{font-size:19px;margin-bottom:10px}
.ring ul{margin-left:18px;color:var(--muted);font-size:15.5px}
.cond{border-top-color:var(--green-3)}

/* ---------- video ---------- */
.video-box,.ytbox{position:relative;padding-top:56.25%;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#000}
.video-box iframe,.video-box video,.ytbox iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.placeholder{position:absolute;inset:0;display:grid;place-items:center;text-align:center;color:#fff;background:linear-gradient(135deg,var(--green),var(--green-3));padding:20px}
.placeholder code{background:rgba(0,0,0,.3);padding:2px 8px;border-radius:6px;font-size:13px}
.ytbox .poster{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.82;transition:.3s}
.ytbox .play{position:absolute;inset:0;width:100%;height:100%;background:linear-gradient(180deg,rgba(0,0,0,.05),rgba(11,42,30,.55));border:0;cursor:pointer;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;font-family:inherit}
.ytbox .play .tri{width:78px;height:78px;border-radius:50%;background:var(--gold);box-shadow:0 6px 26px rgba(0,0,0,.45);
  position:relative;transition:.25s}
.ytbox .play .tri::after{content:'';position:absolute;top:50%;left:54%;transform:translate(-50%,-50%);
  border-left:24px solid #3B2F0B;border-top:15px solid transparent;border-bottom:15px solid transparent}
.ytbox .play .cap{color:#fff;font-weight:700;font-size:17px;text-shadow:0 2px 10px rgba(0,0,0,.6);padding:0 16px;text-align:center}
.ytbox .play:hover .tri{transform:scale(1.09)}
.ytbox .play:hover~.poster,.ytbox:hover .poster{opacity:1}

/* ---------- gallery ---------- */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:12px}
.gallery figure{margin:0;border-radius:10px;overflow:hidden;cursor:pointer;aspect-ratio:4/3;box-shadow:var(--shadow);position:relative;background:#ddd}
.gallery img{width:100%;height:100%;object-fit:cover;transition:.35s}
.gallery figure:hover img{transform:scale(1.08)}
#lb{position:fixed;inset:0;background:rgba(8,20,15,.94);display:none;place-items:center;z-index:200}
#lb.on{display:grid}
#lb img{max-width:92vw;max-height:82vh;border-radius:8px}
#lb .x,#lb .p,#lb .n{position:absolute;background:rgba(255,255,255,.14);color:#fff;border:0;font-size:26px;width:52px;height:52px;border-radius:50%;cursor:pointer}
#lb .x{top:20px;right:20px}
#lb .p{left:20px;top:50%;transform:translateY(-50%)}
#lb .n{right:20px;top:50%;transform:translateY(-50%)}
#lb .cap{position:absolute;bottom:24px;color:#fff;font-size:15px}

/* ---------- evidence ---------- */
.ev{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.ev-item{border-bottom:1px solid #EDEAE0}
.ev-item:last-child{border:0}
.ev-q{width:100%;text-align:right;background:none;border:0;font-family:inherit;font-size:17px;font-weight:600;color:var(--green);padding:18px 22px;cursor:pointer;display:flex;gap:12px;align-items:center;text-align:left}
.ev-q:hover{background:#F4F8F5}
.ev-q .mark{background:var(--green);color:#fff;border-radius:8px;min-width:34px;height:34px;display:grid;place-items:center;font-size:14px;flex:none}
.ev-q .arw{margin-left:auto;color:var(--gold-2);transition:.25s}
.ev-item.open .arw{transform:rotate(180deg)}
.ev-a{display:none;padding:0 22px 22px}
.ev-item.open .ev-a{display:block}

/* ---------- music player ---------- */
#music{position:fixed;right:18px;bottom:18px;z-index:120;display:flex;align-items:center;gap:8px;background:var(--green);color:#fff;border-radius:999px;padding:8px 8px 8px 16px;box-shadow:0 6px 24px rgba(0,0,0,.3);font-size:14px}
#music button{background:var(--gold);color:#3B2F0B;border:0;width:40px;height:40px;border-radius:50%;font-size:17px;cursor:pointer}
#music .lbl{max-width:0;overflow:hidden;white-space:nowrap;transition:.35s;opacity:0}
#music:hover .lbl,#music.playing .lbl,#music.hint .lbl{max-width:190px;opacity:1}
#music.hint button{animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(212,175,55,.7)}50%{box-shadow:0 0 0 12px rgba(212,175,55,0)}}

/* ---------- misc ---------- */
.narr{background:#fff;border-radius:var(--radius);padding:18px 22px;box-shadow:var(--shadow);display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.narr b{font-family:'Trirong',serif;color:var(--green)}
.narr audio{flex:1;min-width:240px}
.crumb{background:var(--green);color:#fff;padding:60px 0 44px;position:relative}
.crumb h1{color:#fff;font-size:clamp(26px,4vw,40px)}
.crumb .path{font-size:14px;opacity:.85;margin-bottom:8px}
.crumb .path a{color:var(--gold)}
.tag{display:inline-block;background:#E9F2EC;color:var(--green-2);border-radius:999px;padding:4px 14px;font-size:14px;font-weight:600;margin:0 6px 6px 0}
footer{background:var(--green);color:#D8E3DC;padding:44px 0 26px;font-size:15px}
footer h4{color:var(--gold);margin-bottom:10px;font-size:17px}
footer a{color:#D8E3DC}
footer .bot{border-top:1px solid rgba(255,255,255,.15);margin-top:26px;padding-top:16px;text-align:center;font-size:13.5px;opacity:.8}
.note{background:#FFF8E1;border-left:4px solid var(--gold);padding:14px 18px;border-radius:0 10px 10px 0;font-size:15px;color:#6B5A17}

/* ---------- ตารางข้อมูลโรงเรียน ---------- */
.facts{list-style:none;margin-top:16px;border-top:1px solid #E8E6DC}
.facts li{display:flex;gap:14px;padding:11px 2px;border-bottom:1px solid #E8E6DC;font-size:16px;flex-wrap:wrap}
.facts b{font-family:'Trirong',serif;color:var(--green);min-width:150px;flex:none}
.facts span{color:var(--muted);flex:1;min-width:200px}
.swatch{display:inline-block;width:16px;height:16px;border-radius:50%;vertical-align:-3px;margin-right:5px;border:1px solid #cfd6d1}

/* ---------- แถบพระราชดำรัส ---------- */
.royal{background:linear-gradient(135deg,#123024,var(--green-2));color:#F2E7C4;border-radius:var(--radius);
  padding:34px 30px;text-align:center;box-shadow:var(--shadow);border:1px solid rgba(212,175,55,.4)}
.royal .mark{font-size:42px;color:var(--gold);line-height:1;font-family:'Trirong',serif}
.royal p{font-size:clamp(17px,2.1vw,21px);font-style:italic;margin:10px 0 14px}
.royal cite{display:block;font-style:normal;font-size:14.5px;color:var(--gold);opacity:.95}

/* ---------- นำทางระหว่างฐาน ---------- */
.stnav{display:flex;gap:14px;justify-content:space-between;align-items:stretch;flex-wrap:wrap;margin-top:34px}
.stnav a{flex:1;min-width:230px;background:#fff;border:1px solid #E8E6DC;border-radius:var(--radius);
  padding:16px 20px;box-shadow:var(--shadow);transition:.2s}
.stnav a:hover{transform:translateY(-3px);border-color:var(--gold)}
.stnav small{display:block;color:var(--gold-2);font-weight:700;font-size:13px;letter-spacing:1px}
.stnav b{font-family:'Trirong',serif;color:var(--green);font-size:18px}
.stnav .next{text-align:right}

@media(max-width:820px){
  .burger{display:block}
  .menu{display:none;width:100%;flex-direction:column;align-items:stretch;padding-bottom:10px}
  .menu.on{display:flex}
  nav.main .wrap{flex-wrap:wrap}
  .menu a{text-align:center}
}
@media(max-width:620px){
  .hero .only-sm{display:block}
  .gallery{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:8px}
  .facts b{min-width:120px}
}