/* ===== ระบบออกเกียรติบัตรออนไลน์ — สไตล์หลัก ===== */
:root{
  --navy:#1F3A5F; --navy-d:#152a45; --gold:#B7912E; --gold-l:#D9B85A;
  --bg:#f4f6fa; --card:#ffffff; --ink:#23303f; --muted:#6b7785;
  --line:#e3e8ef; --ok:#1f9d55; --okbg:#e7f6ee; --err:#c0392b; --errbg:#fdecea;
  --radius:14px; --shadow:0 6px 24px rgba(31,58,95,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:'Sarabun','Segoe UI',Tahoma,sans-serif;
  background:var(--bg); color:var(--ink); line-height:1.6; font-size:16px;
}
a{color:var(--navy);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1080px;margin:0 auto;padding:0 18px}
.container-sm{max-width:680px;margin:0 auto;padding:0 18px}

/* ---- Header ---- */
.site-header{background:linear-gradient(135deg,var(--navy),var(--navy-d));color:#fff;padding:14px 0}
.site-header .bar{display:flex;align-items:center;gap:14px;justify-content:space-between}
.brand{display:flex;align-items:center;gap:12px;color:#fff;font-weight:700;font-size:19px}
.brand .logo{width:42px;height:42px;border-radius:50%;background:var(--gold);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:22px;flex:0 0 auto}
.brand small{display:block;font-weight:400;font-size:12.5px;color:#cdd8e6}
.site-header a{color:#fff}

/* ---- Hero / Search ---- */
.hero{background:linear-gradient(135deg,var(--navy),#2b4d7a);color:#fff;padding:54px 0 70px;text-align:center}
.hero h1{margin:0 0 8px;font-size:34px}
.hero p{margin:0;color:#d7e2f0;font-size:17px}
.search-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:26px;margin-top:-46px;position:relative;z-index:2}
.search-row{display:flex;gap:12px;flex-wrap:wrap}
.search-row select,.search-row input{flex:1;min-width:180px}

/* ---- Form controls ---- */
label{font-weight:600;font-size:14.5px;display:block;margin:0 0 6px}
input[type=text],input[type=search],input[type=password],input[type=number],
input[type=date],input[type=email],select,textarea{
  width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;
  font-family:inherit;font-size:16px;background:#fff;color:var(--ink);transition:border-color .15s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--navy)}
textarea{min-height:90px;resize:vertical}
.field{margin-bottom:16px}
.row{display:flex;gap:14px;flex-wrap:wrap}
.row>.field{flex:1;min-width:200px}

/* ---- Buttons ---- */
.btn{display:inline-flex;align-items:center;gap:8px;justify-content:center;
  padding:12px 22px;border:none;border-radius:10px;font-family:inherit;font-size:16px;
  font-weight:600;cursor:pointer;background:var(--navy);color:#fff;transition:.15s;text-decoration:none}
.btn:hover{background:var(--navy-d);text-decoration:none}
.btn-gold{background:var(--gold)}.btn-gold:hover{background:#a07f24}
.btn-ghost{background:#fff;color:var(--navy);border:1.5px solid var(--line)}
.btn-ghost:hover{background:#f3f6fb}
.btn-danger{background:var(--err)}.btn-danger:hover{background:#9c2c20}
.btn-sm{padding:7px 13px;font-size:14px;border-radius:8px}
.btn-block{width:100%}

/* ---- Cards / panels ---- */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;margin-bottom:22px}
.card h2,.card h3{margin-top:0}
.muted{color:var(--muted)}
.center{text-align:center}

/* ---- Tables ---- */
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
th{background:#f7f9fc;font-weight:700;color:var(--navy);white-space:nowrap}
tr:hover td{background:#fafbfd}
.table-wrap{overflow-x:auto}

/* ---- Result / certificate preview ---- */
.cert-frame{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;
  box-shadow:var(--shadow)}
.cert-frame img{display:block;width:100%;height:auto}
.result-item{display:flex;justify-content:space-between;align-items:center;gap:14px;
  padding:14px 16px;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;background:#fff}
.result-item .meta{font-size:14px;color:var(--muted)}

/* ---- Badges / chips ---- */
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12.5px;font-weight:600}
.badge-on{background:var(--okbg);color:var(--ok)}
.badge-off{background:#eee;color:#777}

/* ---- Alerts ---- */
.alert{padding:13px 16px;border-radius:10px;margin-bottom:16px;font-weight:500}
.alert-success{background:var(--okbg);color:var(--ok)}
.alert-error{background:var(--errbg);color:var(--err)}

/* ---- Stats ---- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:22px}
.stat{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
.stat .n{font-size:30px;font-weight:800;color:var(--navy)}
.stat .l{color:var(--muted);font-size:14px}

/* ---- Footer ---- */
.site-footer{text-align:center;color:var(--muted);padding:30px 18px;font-size:14px}

/* ---- Admin layout ---- */
.admin-wrap{display:flex;min-height:100vh}
.sidebar{width:240px;background:var(--navy);color:#fff;flex:0 0 auto;padding:18px 0}
.sidebar .logo-box{padding:0 20px 18px;border-bottom:1px solid rgba(255,255,255,.12);margin-bottom:12px}
.sidebar a{display:block;color:#cdd8e6;padding:11px 22px;font-weight:500}
.sidebar a:hover,.sidebar a.active{background:rgba(255,255,255,.10);color:#fff;text-decoration:none;border-left:3px solid var(--gold)}
.admin-main{flex:1;min-width:0;background:var(--bg)}
.admin-top{background:#fff;border-bottom:1px solid var(--line);padding:14px 26px;display:flex;justify-content:space-between;align-items:center}
.admin-body{padding:26px}
.toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:18px}

@media(max-width:760px){
  .admin-wrap{flex-direction:column}
  .sidebar{width:100%;display:flex;flex-wrap:wrap;padding:8px}
  .sidebar .logo-box{display:none}
  .sidebar a{padding:8px 14px;border-radius:8px}
  .hero h1{font-size:26px}
}