:root{
  --navy:#0f2a52;
  --navy-2:#163a6e;
  --navy-3:#1e4a86;
  --gold:#c9a227;
  --gold-2:#e0bd45;
  --ink:#1f2937;
  --muted:#6b7280;
  --line:#e3e7ee;
  --bg:#f4f6fa;
  --card:#ffffff;
  --ok:#1c8a4b;
  --bad:#c0392b;
  --warn:#d98b0b;
  --radius:14px;
  --shadow:0 2px 10px rgba(15,42,82,.06);
  --shadow-lg:0 12px 34px rgba(15,42,82,.14);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:'TH Sarabun New','Sarabun',system-ui,-apple-system,sans-serif;
  background:var(--bg);color:var(--ink);
  font-size:18px;line-height:1.55;-webkit-font-smoothing:antialiased;
}
a{color:var(--navy-3);text-decoration:none}
a:hover{text-decoration:underline}

/* ---------- Topbar ---------- */
.topbar{background:linear-gradient(120deg,var(--navy),var(--navy-2));color:#fff;box-shadow:var(--shadow-lg)}
.topbar-inner{max-width:1180px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.brand:hover{text-decoration:none}
.brand-mark{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,var(--gold),var(--gold-2));color:var(--navy);
  display:grid;place-items:center;font-weight:800;font-size:26px;box-shadow:0 4px 12px rgba(201,162,39,.4)}
.brand-text strong{display:block;font-size:22px;letter-spacing:.3px;line-height:1.1}
.brand-text small{color:#c7d4ea;font-size:14px}
.topnav{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.topnav a{color:#dbe4f3;padding:8px 12px;border-radius:9px;font-size:17px}
.topnav a:hover{background:rgba(255,255,255,.12);text-decoration:none;color:#fff}
.nav-user{color:var(--gold-2);font-weight:600;padding:0 6px}
.nav-btn{background:var(--gold);color:var(--navy)!important;font-weight:600}
.nav-btn:hover{background:var(--gold-2)!important}

/* ---------- Layout ---------- */
.container{max-width:1180px;margin:0 auto;padding:26px 20px 60px}

/* ---------- Hero ---------- */
.hero{background:linear-gradient(120deg,var(--navy),var(--navy-3));color:#fff;border-radius:var(--radius);
  padding:34px 34px;margin-bottom:26px;position:relative;overflow:hidden;box-shadow:var(--shadow-lg)}
.hero::after{content:"Σ";position:absolute;right:-10px;bottom:-40px;font-size:220px;opacity:.08;font-weight:800}
.hero h1{margin:0 0 8px;font-size:32px;font-weight:700}
.hero p{margin:0;color:#cdd9ee;font-size:19px;max-width:720px}
.hero .chips{margin-top:16px;display:flex;gap:8px;flex-wrap:wrap}
.hero .chip{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.2);padding:5px 12px;border-radius:20px;font-size:15px}

/* ---------- Group + cards ---------- */
.group{margin:28px 0 8px}
.group-head{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.group-bar{width:6px;height:26px;border-radius:4px}
.group-head h2{margin:0;font-size:23px;color:var(--navy)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 18px;
  box-shadow:var(--shadow);transition:.16s;display:block;color:inherit;position:relative}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);text-decoration:none;border-color:var(--navy-3)}
.card .accent{position:absolute;left:0;top:16px;bottom:16px;width:4px;border-radius:4px}
.card h3{margin:0 0 6px;font-size:20px;color:var(--navy);padding-left:10px}
.card p{margin:0;color:var(--muted);font-size:16px;padding-left:10px}

/* ---------- Tool page ---------- */
.tool-layout{display:grid;grid-template-columns:340px 1fr;gap:22px;align-items:start}
@media(max-width:900px){.tool-layout{grid-template-columns:1fr}}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
.panel h2{margin:0 0 14px;font-size:21px;color:var(--navy);display:flex;align-items:center;gap:8px}
.panel h2 .num{width:26px;height:26px;border-radius:8px;background:var(--navy);color:#fff;display:grid;place-items:center;font-size:15px}
.panel .hint{color:var(--muted);font-size:15px;margin:-6px 0 12px}

/* ---------- Data input ---------- */
.tabs{display:flex;gap:6px;margin-bottom:12px;background:#eef1f7;padding:4px;border-radius:10px}
.tabs button{flex:1;border:0;background:transparent;padding:8px;border-radius:8px;font:inherit;cursor:pointer;color:var(--muted);font-weight:500}
.tabs button.active{background:#fff;color:var(--navy);box-shadow:var(--shadow)}
textarea,input[type=text],input[type=number],input[type=email],input[type=password],select{
  width:100%;font:inherit;padding:10px 12px;border:1px solid #cfd6e2;border-radius:10px;background:#fff;color:var(--ink)}
textarea{min-height:150px;font-family:ui-monospace,'Sarabun',monospace;font-size:15px;resize:vertical}
textarea:focus,input:focus,select:focus{outline:none;border-color:var(--navy-3);box-shadow:0 0 0 3px rgba(30,74,134,.12)}
.filebox{border:2px dashed #c2ccdc;border-radius:12px;padding:22px;text-align:center;color:var(--muted);cursor:pointer;transition:.15s}
.filebox:hover{border-color:var(--navy-3);background:#f7f9fd}
.filebox strong{color:var(--navy)}
.field{margin-bottom:12px}
.field label{display:block;font-weight:600;color:var(--navy);margin-bottom:5px;font-size:16px}
.field .sub{font-weight:400;color:var(--muted);font-size:14px}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;border:0;cursor:pointer;font:inherit;font-weight:600;
  padding:11px 20px;border-radius:11px;background:var(--navy);color:#fff;transition:.15s}
.btn:hover{background:var(--navy-2);text-decoration:none}
.btn.gold{background:linear-gradient(135deg,var(--gold),var(--gold-2));color:var(--navy)}
.btn.gold:hover{filter:brightness(1.05)}
.btn.ghost{background:#eef1f7;color:var(--navy)}
.btn.block{width:100%;justify-content:center}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:8px}

/* ---------- Var picker ---------- */
.varlist{max-height:230px;overflow:auto;border:1px solid var(--line);border-radius:10px;padding:6px}
.varlist label{display:flex;align-items:center;gap:8px;padding:6px 8px;border-radius:8px;cursor:pointer;font-weight:400}
.varlist label:hover{background:#f2f5fb}
.varchip{display:inline-block;background:#eaf0fb;color:var(--navy-3);border-radius:7px;padding:2px 9px;margin:2px;font-size:15px}

/* ---------- Preview table ---------- */
.preview{overflow:auto;border:1px solid var(--line);border-radius:10px;margin-top:10px;max-height:240px}
table{border-collapse:collapse;width:100%;font-size:16px}
.preview table th{position:sticky;top:0}
th,td{padding:8px 11px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}
th:first-child,td:first-child{text-align:left}
thead th{background:var(--navy);color:#fff;font-weight:600}
tbody tr:nth-child(even){background:#f7f9fd}
.tbl-note{color:var(--muted);font-size:14px;padding:6px 4px}

/* ---------- Results ---------- */
.result-block{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin-bottom:18px}
.result-block h3{margin:0 0 4px;color:var(--navy);font-size:22px;border-left:5px solid var(--gold);padding-left:12px}
.result-block .rb-sub{color:var(--muted);margin:0 0 14px;padding-left:17px;font-size:15px}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin:6px 0 4px}
.stat{background:#f7f9fd;border:1px solid var(--line);border-radius:11px;padding:12px 14px}
.stat .k{color:var(--muted);font-size:15px}
.stat .v{color:var(--navy);font-size:24px;font-weight:700;line-height:1.2}
.data-table{overflow:auto;border:1px solid var(--line);border-radius:10px;margin:12px 0}
.sig-yes{color:var(--ok);font-weight:700}
.sig-no{color:var(--muted)}
.badge{display:inline-block;padding:3px 11px;border-radius:20px;font-size:15px;font-weight:600}
.badge.ok{background:#e6f5ec;color:var(--ok)}
.badge.bad{background:#fdecea;color:var(--bad)}
.badge.warn{background:#fdf3e0;color:var(--warn)}
.callout{border-radius:11px;padding:13px 16px;margin:12px 0;font-size:16px;border-left:5px solid}
.callout.info{background:#eef4fd;border-color:var(--navy-3)}
.callout.warn{background:#fdf6e9;border-color:var(--warn)}
.callout.concl{background:#eef7f0;border-color:var(--ok)}
.apa{background:#0f2a52;color:#e9eef7;border-radius:11px;padding:14px 16px;margin-top:12px;font-size:16px}
.apa .t{color:var(--gold-2);font-weight:600;font-size:14px;display:block;margin-bottom:5px;letter-spacing:.5px}

/* ---------- Misc ---------- */
.alert{padding:12px 16px;border-radius:10px;margin-bottom:14px}
.alert.err{background:#fdecea;color:var(--bad);border:1px solid #f3c6c0}
.alert.okmsg{background:#e6f5ec;color:var(--ok);border:1px solid #bfe6cd}
.spinner{width:18px;height:18px;border:3px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}
.center-narrow{max-width:440px;margin:40px auto}
.muted{color:var(--muted)}
.mono{font-family:ui-monospace,monospace}
.hidden{display:none!important}
.text-c{text-align:center}
.mt{margin-top:14px}