/* assets/style.css — ธีมน้ำเงิน-ขาว */
:root{
  --blue-900:#0d47a1; --blue-700:#1565c0; --blue-600:#1976d2; --blue-500:#2196f3;
  --blue-50:#e8f1fc; --blue-100:#d4e6fb;
  --ink:#1a2330; --muted:#5b6b82; --line:#e0e6ef; --bg:#f4f7fc;
  --green:#2e7d32; --green-bg:#e8f5e9; --red:#c62828; --red-bg:#ffebee;
  --amber:#ef6c00; --amber-bg:#fff3e0;
  --shadow:0 2px 12px rgba(21,101,192,.08); --radius:14px;
}
*{box-sizing:border-box}
body{
  margin:0; font-family:'Sarabun',Tahoma,Arial,sans-serif;
  background:var(--bg); color:var(--ink); line-height:1.6;
}
h1,h2,h3,.brand strong,.btn,.course-card h3{font-family:'Kanit',sans-serif;}
a{color:var(--blue-700);text-decoration:none}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
.page{padding:32px 20px 56px}

/* ---------- Header ---------- */
.site-header{background:linear-gradient(120deg,var(--blue-700),var(--blue-900));color:#fff;box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;gap:16px}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.brand-mark{font-size:28px;background:rgba(255,255,255,.15);width:46px;height:46px;display:grid;place-items:center;border-radius:12px}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text strong{font-size:18px}
.brand-text small{opacity:.85;font-size:12.5px}
.header-nav{display:flex;align-items:center;gap:8px}
.header-nav a{color:#fff;padding:8px 12px;border-radius:9px;font-size:14.5px}
.header-nav a:hover{background:rgba(255,255,255,.12)}
.header-nav .btn-ghost{border:1px solid rgba(255,255,255,.5)}

/* ---------- Footer ---------- */
.site-footer{background:#0b1a33;color:#a9bbd6;padding:22px 0;text-align:center;font-size:13.5px}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;border:none;cursor:pointer;
  padding:11px 18px;border-radius:10px;font-size:15px;font-weight:500;transition:.15s;text-decoration:none}
.btn-primary{background:var(--blue-700);color:#fff}
.btn-primary:hover{background:var(--blue-900)}
.btn-secondary{background:#fff;color:var(--blue-700);border:1px solid var(--blue-100)}
.btn-secondary:hover{background:var(--blue-50)}
.btn-success{background:var(--green);color:#fff}
.btn-success:hover{filter:brightness(.92)}
.btn-danger{background:var(--red);color:#fff}
.btn-danger:hover{filter:brightness(.92)}
.btn-sm{padding:7px 13px;font-size:13.5px;border-radius:8px}
.btn-block{width:100%;justify-content:center}

/* ---------- Cards / Grid ---------- */
.page-head{margin-bottom:24px}
.page-head h1{margin:0 0 6px;font-size:26px;color:var(--blue-900)}
.page-head p{margin:0;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.course-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:20px;display:flex;flex-direction:column;gap:12px}
.course-card h3{margin:0;font-size:18.5px;color:var(--blue-900)}
.course-card .desc{color:var(--muted);font-size:14.5px;flex:1}
.meta{display:flex;flex-direction:column;gap:6px;font-size:14px;color:var(--ink)}
.meta .row{display:flex;gap:8px;align-items:flex-start}
.meta .ic{color:var(--blue-600);flex:none}
.card-actions{display:flex;gap:8px;margin-top:6px;flex-wrap:wrap}

/* badge / seats */
.badge{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;
  padding:4px 11px;border-radius:999px}
.badge-open{background:var(--green-bg);color:var(--green)}
.badge-closed{background:#eceff1;color:#546e7a}
.badge-full{background:var(--red-bg);color:var(--red)}
.badge-pending{background:var(--amber-bg);color:var(--amber)}
.badge-approved{background:var(--green-bg);color:var(--green)}
.badge-rejected{background:var(--red-bg);color:var(--red)}
.seats{font-weight:600}
.seats.low{color:var(--amber)}
.seats.full{color:var(--red)}

/* ---------- Panel / Forms ---------- */
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:26px}
.panel + .panel{margin-top:20px}
.panel h2{margin:0 0 18px;font-size:20px;color:var(--blue-900)}
.form-row{margin-bottom:16px}
.form-row label{display:block;font-weight:500;margin-bottom:6px;font-size:14.5px}
.form-row .req{color:var(--red)}
.input,select,textarea{width:100%;padding:11px 13px;border:1px solid var(--line);
  border-radius:9px;font-family:inherit;font-size:15px;background:#fcfdff;color:var(--ink)}
.input:focus,select:focus,textarea:focus{outline:none;border-color:var(--blue-500);
  box-shadow:0 0 0 3px var(--blue-50)}
textarea{min-height:90px;resize:vertical}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}
.checkbox-row{display:flex;align-items:center;gap:10px;padding:12px 14px;border:1px solid var(--line);
  border-radius:10px;margin-bottom:10px;background:#fcfdff;cursor:pointer}
.checkbox-row input{width:20px;height:20px;accent-color:var(--blue-700);cursor:pointer}
.checkbox-row span{font-size:15px}
.form-actions{display:flex;gap:10px;margin-top:8px;flex-wrap:wrap}
.hint{font-size:13px;color:var(--muted);margin-top:4px}

/* ---------- Alerts ---------- */
.alert{padding:13px 16px;border-radius:10px;margin-bottom:18px;font-size:14.5px}
.alert-success{background:var(--green-bg);color:var(--green);border:1px solid #a5d6a7}
.alert-error{background:var(--red-bg);color:var(--red);border:1px solid #ef9a9a}
.alert-info{background:var(--blue-50);color:var(--blue-900);border:1px solid var(--blue-100)}
.alert-warn{background:var(--amber-bg);color:var(--amber);border:1px solid #ffcc80}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
table.data{width:100%;border-collapse:collapse;font-size:14.5px;min-width:640px}
table.data th,table.data td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}
table.data th{background:var(--blue-50);color:var(--blue-900);font-family:'Kanit';font-weight:500;white-space:nowrap}
table.data tr:last-child td{border-bottom:none}
table.data tr:hover td{background:#fafcff}
.center{text-align:center}
.yes{color:var(--green);font-weight:600}
.no{color:#90a4ae}

/* ---------- Detail page ---------- */
.detail-head{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:26px;margin-bottom:20px}
.detail-head h1{margin:0 0 10px;font-size:24px;color:var(--blue-900)}
.detail-meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-top:16px}
.detail-meta .box{background:var(--blue-50);border-radius:10px;padding:14px}
.detail-meta .box .k{font-size:12.5px;color:var(--muted)}
.detail-meta .box .v{font-size:15.5px;font-weight:600;color:var(--blue-900);margin-top:2px}
.back-link{display:inline-flex;align-items:center;gap:6px;margin-bottom:16px;color:var(--muted)}

/* ---------- Admin login ---------- */
.login-wrap{max-width:400px;margin:60px auto}
.login-wrap .panel{text-align:center}
.login-wrap .brand-mark{font-size:40px;margin-bottom:8px}

/* admin top bar */
.admin-bar{background:#0b1a33;color:#cfe0f7}
.admin-bar .header-inner{padding:10px 20px}
.admin-bar a{color:#cfe0f7}
.admin-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:20px;flex-wrap:wrap}

@media(max-width:640px){
  .form-grid{grid-template-columns:1fr}
  .brand-text small{display:none}
  .page-head h1{font-size:22px}
}