:root{
  --bg:#f4f6f8; --panel:#fff; --ink:#1f2937; --muted:#6b7280; --line:#e5e7eb;
  --brand:#0f766e; --brand-d:#0b5a54; --warn:#b45309; --warn-bg:#fef3c7;
  --err:#b91c1c; --err-bg:#fee2e2; --ok:#15803d; --ok-bg:#dcfce7;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);font-size:15px;line-height:1.45}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
h1{font-size:22px;margin:0 0 16px}
h2{font-size:16px;margin:0 0 12px}

/* Topbar */
.topbar{display:flex;align-items:center;gap:16px;background:var(--brand);color:#fff;padding:10px 18px;flex-wrap:wrap}
.brand a{color:#fff;font-weight:700;font-size:17px}
.brand span{font-weight:400;opacity:.85;font-size:13px}
.menu{display:flex;gap:4px;flex-wrap:wrap;flex:1}
.menu a{color:#e6fffb;padding:6px 10px;border-radius:6px}
.menu a:hover{background:rgba(255,255,255,.15);text-decoration:none}
.user{display:flex;align-items:center;gap:10px;font-size:13px}
.who{opacity:.95}
.role{font-style:normal;font-size:11px;padding:1px 6px;border-radius:10px;background:rgba(255,255,255,.2)}
.btn-logout{color:#fff;border:1px solid rgba(255,255,255,.5);padding:4px 10px;border-radius:6px}

.container{max-width:1100px;margin:22px auto;padding:0 18px}
.foot{text-align:center;color:var(--muted);font-size:12px;padding:24px}

/* Flash */
.flash{padding:10px 14px;border-radius:8px;margin-bottom:14px;border:1px solid}
.flash-ok{background:var(--ok-bg);border-color:#86efac;color:var(--ok)}
.flash-error{background:var(--err-bg);border-color:#fca5a5;color:var(--err)}
.flash-warn,.flash-info{background:var(--warn-bg);border-color:#fcd34d;color:var(--warn)}

/* Cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:12px;margin-bottom:20px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px}
.card-h{color:var(--muted);font-size:13px}
.card-v{font-size:24px;font-weight:700;margin-top:4px}
.card-warn{border-color:#fcd34d;background:var(--warn-bg)}

/* Panels & tables */
.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px;margin-bottom:18px}
.panel-warn{border-color:#fcd34d;background:#fffbeb}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:780px){.grid-2{grid-template-columns:1fr}}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);font-size:14px}
th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.02em}
.r{text-align:right}.c{text-align:center}.nowrap{white-space:nowrap}
.muted{color:var(--muted)}
.warn-txt{color:var(--err);font-weight:700}
.kv td{border:none;padding:3px 6px}
.kv td:first-child{color:var(--muted);width:140px}
tr.clickable{cursor:pointer}
tr.clickable:hover{background:#f9fafb}
tr.locked{background:#fff7ed}

/* Forms */
label{display:block;margin-bottom:10px;font-size:13px;color:var(--muted)}
input,select,textarea{width:100%;padding:8px 10px;border:1px solid #cbd5e1;border-radius:8px;font-size:15px;background:#fff;color:var(--ink);font-family:inherit}
textarea{resize:vertical}
.row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.row4{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;align-items:end}
@media(max-width:680px){.row3,.row4{grid-template-columns:1fr}}
.filterbar{display:flex;align-items:center;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.filterbar input,.filterbar select{width:auto}
.grow{flex:1}
.hint{color:var(--muted);font-size:12px;margin-top:8px}
.note{font-size:13px;margin:-4px 0 10px;min-height:16px}
.note-ok{color:var(--ok)}
.note-err{color:var(--err);font-weight:600}
fieldset.ncc{border:1px solid var(--line);border-radius:8px;padding:8px 12px 2px;margin:4px 0 12px}
fieldset.ncc legend{font-size:12px;color:var(--muted);padding:0 6px}

/* Buttons */
.btn{display:inline-block;padding:8px 14px;border-radius:8px;border:1px solid #cbd5e1;background:#fff;color:var(--ink);cursor:pointer;font-size:14px}
.btn:hover{background:#f1f5f9;text-decoration:none}
.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-d)}
.btn-warn{background:#fff;border-color:#fca5a5;color:var(--err)}
.btn-sm{padding:4px 10px;font-size:13px}
.btn-lg{padding:11px 22px;font-size:16px;margin-top:8px}
.btn-block{width:100%}
.actions{display:flex;gap:12px;margin-top:8px}

/* Badges */
.badge{font-size:12px;padding:2px 8px;border-radius:10px;font-weight:600}
.badge-NHAP,.badge-CHO_DUYET{background:var(--warn-bg);color:var(--warn)}
.badge-DA_DUYET{background:var(--ok-bg);color:var(--ok)}
.badge-HUY{background:var(--err-bg);color:var(--err)}

/* Login */
.login-wrap{display:flex;justify-content:center;align-items:center;min-height:75vh}
.login-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:32px;width:340px;box-shadow:0 10px 30px rgba(0,0,0,.06)}
.login-card h1{text-align:center;color:var(--brand);margin-bottom:2px}
.login-card .sub{text-align:center;color:var(--muted);margin:0 0 20px}

/* Hướng dẫn */
ol.steps{margin:0;padding-left:20px}
ol.steps li{margin:7px 0}
.callout{background:#ecfeff;border:1px solid #a5f3fc;border-radius:8px;padding:10px 14px;margin-top:10px}
.callout-warn{background:#fffbeb;border-color:#fcd34d}
.panel ul{margin:6px 0;padding-left:20px}
.panel ul li{margin:5px 0}