:root{
  --primary:#0a4d8c; --primary-dark:#073a6b; --accent:#e30613;
  --bg:#f4f6f9; --card:#fff; --border:#dce3ec; --muted:#6b7785;
  --ok:#1a8754; --warn:#b8860b;
}
*{box-sizing:border-box}
body{margin:0;font-family:'Segoe UI',Roboto,Arial,sans-serif;background:var(--bg);color:#1f2933;font-size:15px}
a{color:var(--primary)}
/* ===== Header / Appbar (banner trắng + nút bo tròn nhiều màu) ===== */
header.appbar{background:#fff;border-bottom:1px solid var(--border);padding:12px 26px;display:flex;align-items:center;gap:18px;box-shadow:0 2px 10px rgba(15,23,42,.06);position:sticky;top:0;z-index:50}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand-badge{width:46px;height:46px;border-radius:50%;display:grid;place-items:center;font-weight:800;color:#fff;font-size:15px;letter-spacing:.5px;background:radial-gradient(circle at 30% 28%,#2a7fe0,#0a4d8c);box-shadow:0 2px 6px rgba(10,77,140,.35);border:2px solid #fff;outline:2px solid #e3edf7}
.brand-titles{display:flex;flex-direction:column;line-height:1.18}
.brand-title{font-size:18px;font-weight:800;color:var(--primary)}
.brand-title .accent{color:var(--accent)}
.brand-sub{font-size:12px;color:var(--muted)}
.appnav{margin-left:auto;display:flex;gap:10px;flex-wrap:wrap}
.navbtn{display:inline-flex;align-items:center;gap:8px;padding:9px 17px;border-radius:9px;font-weight:600;font-size:14px;color:#fff;text-decoration:none;box-shadow:0 1px 3px rgba(0,0,0,.14);transition:.15s}
.navbtn .ni{font-size:15px;line-height:1}
.navbtn:hover{filter:brightness(1.07);transform:translateY(-1px)}
.navbtn.active{box-shadow:0 0 0 3px rgba(15,23,42,.14),0 2px 6px rgba(0,0,0,.16)}
.nb-blue{background:#2563eb}
.nb-amber{background:#e08a00}
.nb-green{background:#16a34a}
.nb-slate{background:#475569}
.nb-red{background:#dc2626}
.nb-indigo{background:#4f46e5}

/* ===== Dashboard ===== */
.kpi-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:18px}
.kpi{background:#fff;border:1px solid var(--border);border-radius:12px;padding:18px 20px;box-shadow:0 1px 3px rgba(15,23,42,.05);position:relative;overflow:hidden}
.kpi::after{content:"";position:absolute;right:-18px;top:-18px;width:74px;height:74px;border-radius:50%;opacity:.12;background:var(--kc,#2563eb)}
.kpi .kpi-ic{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-size:20px;color:#fff;background:var(--kc,#2563eb);margin-bottom:12px}
.kpi .kpi-val{font-size:26px;font-weight:800;color:#1f2933;line-height:1.1}
.kpi .kpi-lbl{font-size:13px;color:var(--muted);margin-top:3px}
.kpi .kpi-sub{font-size:12px;margin-top:7px;font-weight:600}
.dash-grid{display:grid;grid-template-columns:2fr 1fr;gap:16px;margin-bottom:18px}
.dash-grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:18px}
.chart-card{background:#fff;border:1px solid var(--border);border-radius:12px;padding:18px 20px;box-shadow:0 1px 3px rgba(15,23,42,.05)}
.chart-card h3{margin:0 0 14px;font-size:15px;color:var(--primary)}
.chart-card canvas{max-height:280px}
.mini-list{list-style:none;margin:0;padding:0}
.mini-list li{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:9px 0;border-bottom:1px solid var(--border);font-size:13.5px}
.mini-list li:last-child{border-bottom:none}
.mini-list .mtitle{font-weight:600}
.mini-list .msub{font-size:12px;color:var(--muted)}
@media(max-width:980px){.kpi-grid{grid-template-columns:repeat(2,1fr)}.dash-grid,.dash-grid2{grid-template-columns:1fr}}
@media(max-width:820px){header.appbar{flex-wrap:wrap}.appnav{width:100%}.navbtn{flex:1;justify-content:center;padding:9px 10px}}
.container{max-width:1080px;margin:22px auto;padding:0 18px}
.card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:22px;margin-bottom:18px;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.card h2{margin:0 0 16px;font-size:16px;color:var(--primary);border-bottom:2px solid var(--border);padding-bottom:8px}
.card h3{font-size:14px;color:var(--primary-dark);margin:18px 0 10px}

/* Steps */
.steps{display:flex;gap:8px;margin-bottom:18px;flex-wrap:wrap}
.steps .step{flex:1;min-width:150px;padding:10px 14px;border-radius:8px;background:#eef2f7;color:var(--muted);font-weight:600;font-size:13px;border:1px solid var(--border)}
.steps .step.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.steps .step.done{background:#e7f5ee;color:var(--ok);border-color:#bfe6cf}
.steps .step b{display:inline-block;width:22px;height:22px;line-height:22px;text-align:center;background:rgba(0,0,0,.12);border-radius:50%;margin-right:8px}

/* Upload */
.dropzone{border:2px dashed var(--border);border-radius:10px;padding:18px;text-align:center;cursor:pointer;transition:.15s;background:#fafbfd}
.dropzone:hover,.dropzone.drag{border-color:var(--primary);background:#eef4fb}
.dropzone .ic{font-size:32px}
.dropzone small{color:var(--muted)}
.upload-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.thumb{margin-top:10px;max-height:120px;border-radius:6px;border:1px solid var(--border)}
.filename{font-size:12px;color:var(--ok);margin-top:6px;word-break:break-all}

/* Form */
.grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
.field{display:flex;flex-direction:column;gap:4px}
.field.full{grid-column:1/-1}
label{font-size:12.5px;font-weight:600;color:#3a4654}
input,select,textarea{padding:9px 11px;border:1px solid var(--border);border-radius:7px;font-size:14px;font-family:inherit;background:#fff}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(10,77,140,.12)}
textarea{resize:vertical;min-height:60px}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border:none;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;text-decoration:none}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-accent{background:var(--accent);color:#fff}
.btn-ghost{background:#eef2f7;color:var(--primary)}
.btn-ghost:hover{background:#e2e8f0}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn-lg{padding:13px 26px;font-size:15px}
.actions{display:flex;gap:10px;justify-content:space-between;margin-top:18px;flex-wrap:wrap}

/* misc */
.checkbox-row{display:flex;align-items:center;gap:10px;padding:10px 0}
.checkbox-row input{width:18px;height:18px}
.sig-preview{max-height:90px;border:1px solid var(--border);border-radius:6px;background:#fff;padding:4px}
.hint{font-size:12.5px;color:var(--muted)}
.badge{display:inline-block;padding:2px 8px;border-radius:20px;font-size:12px;font-weight:600}
.badge.ai{background:#e7f0fb;color:var(--primary)}
.badge.manual{background:#fdf2e3;color:var(--warn)}
.alert{padding:12px 14px;border-radius:8px;margin:10px 0;font-size:13.5px}
.alert.err{background:#fdecea;color:#b3261e;border:1px solid #f5c6c2}
.alert.ok{background:#e7f5ee;color:var(--ok);border:1px solid #bfe6cf}
.alert.info{background:#eef4fb;color:var(--primary);border:1px solid #c9ddf3}
.hidden{display:none!important}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:10px;border-bottom:1px solid var(--border);font-size:13.5px}
th{color:var(--muted);font-weight:600}
.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}
.spinner.dark{border-color:rgba(10,77,140,.25);border-top-color:var(--primary)}
@keyframes spin{to{transform:rotate(360deg)}}
.result-box{text-align:center;padding:24px}
.result-box .big{font-size:42px}
@media(max-width:760px){.grid,.grid-3,.upload-grid{grid-template-columns:1fr}}