:root{
    --navy:#0b3b78;
    --navy-deep:#062957;
    --blue:#145eae;
    --blue-soft:#eaf3ff;
    --gold:#d8a62d;
    --gold-light:#f7d875;
    --white:#fff;
    --ink:#14243b;
    --muted:#64748b;
    --line:#dbe5f1;
    --surface:#f4f8fd;
    --danger:#b42318;
    --success:#16794a;
    --shadow:0 18px 55px rgba(11,59,120,.12);
}

*{box-sizing:border-box}
html{font-family:"Sarabun",Tahoma,sans-serif;background:var(--surface)}
body{margin:0;font-family:"Sarabun",Tahoma,sans-serif;background:linear-gradient(135deg,#f7faff 0%,#edf4fc 100%);color:var(--ink);font-size:16px}
button,input,select,textarea{font-family:inherit}

.sidebar{position:fixed;inset:0 auto 0 0;width:282px;background:linear-gradient(165deg,var(--navy) 0%,var(--navy-deep) 75%);color:#fff;padding:24px 18px;display:flex;flex-direction:column;z-index:30;box-shadow:10px 0 35px rgba(6,41,87,.16)}
.sidebar::before{content:"";position:absolute;right:-60px;top:-90px;width:210px;height:210px;border-radius:50%;background:rgba(255,255,255,.06)}
.brand{position:relative;display:flex;gap:13px;align-items:center;margin-bottom:30px;padding:0 6px 20px;border-bottom:1px solid rgba(255,255,255,.15)}
.school-logo-wrap{width:62px;height:62px;border-radius:50%;background:#fff;padding:4px;box-shadow:0 8px 25px rgba(0,0,0,.18);flex:0 0 auto}
.school-logo-wrap img{width:100%;height:100%;display:block}
.brand strong{display:block;font-size:1rem;line-height:1.25}
.brand small,.sidebar-user small{display:block;opacity:.76;margin-top:4px}
.sidebar nav{display:grid;gap:7px;position:relative}
.sidebar a{color:#fff;text-decoration:none;padding:12px 14px;border-radius:12px;font-weight:600;transition:.2s ease}
.sidebar nav a:hover{background:rgba(255,255,255,.12);transform:translateX(3px)}
.sidebar nav a::before{content:"•";color:var(--gold-light);margin-right:9px}
.sidebar-user{margin-top:auto;border-top:1px solid rgba(255,255,255,.15);padding:18px 8px 0}
.sidebar-user>a{display:inline-block;margin-top:10px;padding:8px 0;color:var(--gold-light)}

.main{margin-left:282px;min-height:100vh;padding:26px 30px 48px}
.topbar{display:flex;align-items:center;gap:14px;margin-bottom:24px;padding:16px 20px;background:rgba(255,255,255,.88);backdrop-filter:blur(8px);border:1px solid rgba(216,166,45,.24);border-radius:18px;box-shadow:0 10px 30px rgba(11,59,120,.08)}
.topbar h1{margin:2px 0 0;font-size:1.62rem;color:var(--navy)}
.topbar-kicker{font-size:.7rem;font-weight:800;letter-spacing:.14em;color:var(--gold)}
.topbar-user{margin-left:auto;font-weight:600;color:var(--navy)}
.menu-btn{display:none;border:0;background:var(--navy);color:#fff;border-radius:10px;width:42px;height:42px;font-size:1.2rem}

.page-heading{display:flex;justify-content:space-between;align-items:flex-end;margin:5px 0 18px;padding:0 4px}
.page-heading h2{margin:4px 0 3px;font-size:1.55rem;color:var(--navy)}
.page-heading p{margin:0;color:var(--muted)}
.eyebrow{font-size:.72rem;font-weight:800;letter-spacing:.18em;color:var(--gold)}

.panel{background:rgba(255,255,255,.96);border-radius:20px;padding:24px;box-shadow:var(--shadow);border:1px solid rgba(216,166,45,.18);margin-bottom:22px}
.panel-head{display:flex;justify-content:space-between;align-items:center}
.premium-form{overflow:hidden;position:relative}
.premium-form::before{content:"";position:absolute;left:0;right:0;top:0;height:5px;background:linear-gradient(90deg,var(--navy),var(--blue),var(--gold))}
.section-title{display:flex;align-items:center;gap:12px;margin:4px 0 18px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.section-title>span{display:grid;place-items:center;width:36px;height:36px;border-radius:12px;background:linear-gradient(135deg,var(--gold-light),var(--gold));color:var(--navy-deep);font-weight:800;box-shadow:0 6px 16px rgba(216,166,45,.24)}
.section-title strong{display:block;color:var(--navy);font-size:1.05rem}
.section-title small{display:block;color:var(--muted);margin-top:1px}
.section-spaced{margin-top:28px}

.cards{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px;margin-bottom:20px}
.stat{background:#fff;border-radius:18px;padding:19px;box-shadow:0 10px 28px rgba(11,59,120,.08);border:1px solid rgba(216,166,45,.14)}
.stat span{display:block;color:var(--muted)}
.stat strong{font-size:1.75rem;color:var(--navy)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:0;border-radius:11px;padding:10px 16px;text-decoration:none;cursor:pointer;font:inherit;font-weight:700;transition:.18s ease;box-shadow:none}
.btn:hover{transform:translateY(-1px);filter:brightness(1.03)}
.primary{background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;box-shadow:0 8px 18px rgba(20,94,174,.22)}
.success{background:linear-gradient(135deg,#13784a,#1e9a61);color:#fff}
.secondary{background:linear-gradient(135deg,var(--gold-light),var(--gold));color:var(--navy-deep)}
.light{background:#edf3fa;color:var(--navy);border:1px solid #d9e5f2}
.full{width:100%}
.danger{background:#fee8e7;color:#9f241b}

.alert{padding:12px 15px;border-radius:12px;margin:0 0 16px;font-weight:600;border:1px solid transparent}
.alert.success{background:#e6f7ef;color:#166534;border-color:#bce7d2}
.alert.danger{background:#fff0ef;color:#a12820;border-color:#f3c7c3}

.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px 20px}
.form-grid label,.login-card label{display:grid;gap:7px;font-weight:700;color:#263b56}
input,select,textarea{width:100%;padding:11px 13px;border:1px solid #cddaea;border-radius:11px;background:#fff;color:var(--ink);font:inherit;transition:.18s ease}
input[readonly]{background:#f5f8fc;color:#52657c}
input:focus,select:focus,textarea:focus{outline:3px solid rgba(20,94,174,.13);border-color:var(--blue);box-shadow:0 0 0 1px rgba(20,94,174,.06)}
select:disabled{background:#eef3f8;color:#7a8899}
.field-help{min-height:1em;font-size:.78rem;font-weight:500;color:var(--muted)}
.field-help.loading{color:var(--blue)}
.field-help.success{color:var(--success)}
.field-help.warning{color:#9a6510}
.field-help.error{color:var(--danger)}

.actions{display:flex;gap:10px;margin-top:22px;justify-content:flex-end;flex-wrap:wrap}
.sticky-actions{padding-top:18px;border-top:1px solid var(--line)}
.table-wrap{overflow:auto}
.premium-table-wrap{border:1px solid var(--line);border-radius:14px;margin-bottom:14px}
table{width:100%;border-collapse:collapse}
th,td{padding:11px;border-bottom:1px solid #e4ebf4;text-align:left}
th{background:#f2f6fb;color:var(--navy);font-weight:800}
#itemsTable tfoot th{background:#fff8e7;border-top:2px solid var(--gold)}
#itemsTable input{min-width:95px}
.num{text-align:right}.nowrap{white-space:nowrap}
.badge{padding:4px 8px;border-radius:999px;font-size:.85rem}.badge.draft{background:#fef3c7}.badge.printed{background:#dcfce7}.badge.cancelled{background:#fee2e2}
.inline{display:inline}.link{border:0;background:none;padding:0;color:var(--blue);cursor:pointer}.danger-text{color:#b91c1c}
.filters,.inline-form{display:flex;gap:10px;align-items:end;flex-wrap:wrap}
.tabs{display:flex;gap:8px;margin-bottom:12px}.tabs button{border:0;padding:10px 14px;border-radius:9px}.tabs .active{background:var(--navy);color:#fff}.tab-panel{display:none}.tab-panel.active{display:block}
.icon{border:0;border-radius:9px;padding:6px 11px;cursor:pointer}

.login-main{min-height:100vh;display:grid;place-items:center;padding:20px;background:radial-gradient(circle at top,#dcecff,#f7faff)}
.login-card{width:min(440px,100%);background:#fff;border-radius:22px;padding:32px;box-shadow:0 24px 70px rgba(11,59,120,.18);border:1px solid rgba(216,166,45,.22)}
.login-card h1{font-size:1.45rem;color:var(--navy)}
.login-card form{display:grid;gap:15px}
.login-logo{width:60px;height:60px;border-radius:18px;background:linear-gradient(135deg,var(--gold-light),var(--gold));color:var(--navy);display:grid;place-items:center;font-weight:800}

.paper{width:210mm;min-height:297mm;margin:18px auto;background:#fff;padding:18mm 22mm;box-shadow:0 4px 25px #0002;font-family:"TH Sarabun New","Sarabun",Tahoma,sans-serif;font-size:18pt;line-height:1.25}
.official-header{text-align:center;position:relative}.official-header h1{font-size:29pt;margin:0}.garuda{position:absolute;left:0;top:0;font-size:12pt;border:1px dashed #999;padding:8px}.doc-meta{font-size:18pt}.indent{text-indent:2.5em}.signature td{width:50%;text-align:center;vertical-align:top;height:120px}.center{text-align:center}.right{text-align:right}.items-print,.items-print th,.items-print td{border:1px solid #000}.page-break{break-before:page}.print-toolbar{text-align:center;margin-bottom:12px}.form-panel h2{margin-top:28px}

@media(max-width:1050px){
    .cards{grid-template-columns:repeat(2,1fr)}
    .sidebar{transform:translateX(-100%);transition:.22s ease}
    .sidebar-open .sidebar{transform:none}
    .main{margin-left:0;padding:20px}
    .menu-btn{display:block}
    .topbar-user{display:none}
}
@media(max-width:720px){
    .form-grid{grid-template-columns:1fr}
    .main{padding:14px}
    .panel{padding:19px 15px}
    .topbar{padding:13px 14px}
    .topbar h1{font-size:1.3rem}
    .actions .btn{width:100%}
}
@media print{
    body{background:#fff}
    .sidebar,.topbar,.print-toolbar,.alert{display:none!important}
    .main{margin:0;padding:0}
    .paper{box-shadow:none;margin:0;width:210mm;min-height:297mm;page-break-after:always}
    .paper:last-of-type{page-break-after:auto}
    @page{size:A4;margin:0}
}