:root{
  --bg:#0f172a; --bg2:#1e293b; --card:#ffffff; --line:#e2e8f0;
  --brand:#0d9488; --brand-d:#0f766e; --ink:#0f172a; --muted:#64748b;
  --ok:#16a34a; --warn:#d97706; --danger:#dc2626; --soft:#f8fafc;
}
*{box-sizing:border-box}
body{margin:0;font-family:"Segoe UI","Sarabun",Tahoma,sans-serif;background:var(--soft);color:var(--ink)}
a{color:var(--brand-d);text-decoration:none}
a:hover{text-decoration:underline}

/* layout */
.layout{display:flex;min-height:100vh}
.sidebar{width:230px;background:var(--bg);color:#cbd5e1;flex-shrink:0;padding:18px 0}
.sidebar .brand{font-size:18px;font-weight:700;color:#fff;padding:0 20px 18px;border-bottom:1px solid #334155;margin-bottom:10px}
.sidebar a{display:block;color:#cbd5e1;padding:11px 20px;font-size:14px}
.sidebar a:hover{background:var(--bg2);text-decoration:none;color:#fff}
.sidebar a.active{background:var(--brand);color:#fff;border-left:3px solid #5eead4}
.sidebar .sec{font-size:11px;text-transform:uppercase;color:#64748b;padding:14px 20px 4px;letter-spacing:.5px}
.main{flex:1;display:flex;flex-direction:column}
.topbar{background:#fff;border-bottom:1px solid var(--line);padding:12px 24px;display:flex;justify-content:space-between;align-items:center}
.topbar .who{font-size:13px;color:var(--muted)}
.content{padding:24px;max-width:1200px}

h1{font-size:22px;margin:0 0 18px}
h2{font-size:17px;margin:0 0 12px}

/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:24px}
.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}
.stat .label{font-size:13px;color:var(--muted)}
.stat .num{font-size:26px;font-weight:700;margin-top:6px}
.stat.brand{background:linear-gradient(135deg,var(--brand),var(--brand-d));color:#fff;border:none}
.stat.brand .label{color:#ccfbf1}

.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;margin-bottom:20px}

/* table */
table{width:100%;border-collapse:collapse;background:#fff}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}
th{background:var(--soft);color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase}
tr:hover td{background:#fafcff}
.sort-link{color:inherit;text-decoration:none;white-space:nowrap}
.sort-link:hover{text-decoration:underline}
.tbl-wrap{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}

/* badge */
.badge{padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600}
.b-active{background:#dbeafe;color:#1d4ed8}
.b-redeemed{background:#dcfce7;color:#15803d}
.b-defaulted{background:#fee2e2;color:#b91c1c}
.b-soon{background:#fef3c7;color:#b45309}

/* forms */
.form-row{margin-bottom:14px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
label{display:block;font-size:13px;font-weight:600;margin-bottom:5px;color:#334155}
input,select,textarea{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-family:inherit}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand)}
.hint{font-size:12px;color:var(--muted);margin-top:4px}

.btn{display:inline-block;background:var(--brand);color:#fff;border:none;padding:10px 18px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer}
.btn:hover{background:var(--brand-d);text-decoration:none;color:#fff}
.btn.sm{padding:6px 12px;font-size:13px}
.btn.gray{background:#e2e8f0;color:#334155}
.btn.danger{background:var(--danger)}
.btn.warn{background:var(--warn)}

.alert{padding:12px 16px;border-radius:8px;margin-bottom:16px;font-size:14px}
.alert.ok{background:#dcfce7;color:#166534;border:1px solid #86efac}
.alert.err{background:#fee2e2;color:#991b1b;border:1px solid #fca5a5}
.alert.info{background:#e0f2fe;color:#075985;border:1px solid #7dd3fc}

.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:12px;flex-wrap:wrap}
.right{text-align:right}
.muted{color:var(--muted)}
.big-num{font-size:32px;font-weight:800;color:var(--brand-d)}

/* login */
.login-wrap{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#0f766e,#0f172a)}
.login-box{background:#fff;border-radius:16px;padding:36px;width:360px;box-shadow:0 20px 50px rgba(0,0,0,.3)}
.login-box h1{text-align:center;color:var(--brand-d)}

.calc-box{background:#f0fdfa;border:1px solid #99f6e4;border-radius:10px;padding:18px;margin-top:14px}
.kv{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px dashed #cbd5e1;font-size:14px}
.kv:last-child{border-bottom:none}
.kv .v{font-weight:600}
.kv.total{font-size:18px;border-top:2px solid var(--brand);margin-top:8px;padding-top:12px}
.kv.total .v{color:var(--brand-d)}

/* ===== Responsive / มือถือ ===== */
.menu-toggle{display:none;background:none;border:none;font-size:24px;line-height:1;cursor:pointer;color:var(--ink);padding:2px 8px;margin-right:4px}
.overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:40}

@media (max-width:820px){
  .sidebar{position:fixed;top:0;left:-260px;width:240px;height:100vh;overflow-y:auto;z-index:50;
           transition:left .25s ease;box-shadow:2px 0 16px rgba(0,0,0,.25)}
  .sidebar.open{left:0}
  .overlay.show{display:block}
  .menu-toggle{display:inline-block}
  .topbar{position:sticky;top:0;z-index:30;padding:10px 14px}
  .topbar .who{font-size:12px}
  .content{padding:16px}
  h1{font-size:19px}
  .form-grid{grid-template-columns:1fr !important}
  .review-grid{grid-template-columns:1fr !important}
  .cards{grid-template-columns:1fr 1fr}
  .tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .card{overflow-x:auto}
  table{min-width:560px}
  .toolbar{flex-direction:column;align-items:stretch}
  .toolbar .btn,.toolbar input,.toolbar select{width:100%}
  .stepper .s{font-size:11px;padding:8px 3px}
  .stepper .s .n{width:20px;height:20px;line-height:20px;margin-right:3px}
  .login-box{width:92%;max-width:360px}
  .wizard-nav{flex-wrap:wrap;gap:8px}
  .wizard-nav .btn{flex:1;text-align:center}
}
@media (max-width:440px){
  .cards{grid-template-columns:1fr}
  .stepper .s span:not(.n){display:none}      /* โชว์เฉพาะหมายเลขขั้นบนจอเล็กมาก */
  .stepper .s{padding:10px 2px}
}