:root{
  --bg:#0b0f14;
  --card:#0f1722;
  --muted:#9aa4b2;
  --text:#e6edf3;
  --line:#1e2a3a;
  --brand:#4da3ff;
  --brand2:#22c55e;
  --warn:#f59e0b;
  --danger:#ef4444;
  --radius:14px;
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font);
  background:radial-gradient(1200px 600px at 20% 0%, rgba(77,163,255,.10), transparent 60%),
             radial-gradient(900px 500px at 90% 10%, rgba(34,197,94,.10), transparent 55%),
             var(--bg);
  color:var(--text);
}
a{color:inherit;text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:18px}
.card{
  background:linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.015));
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.card-pad{padding:18px}
.row{display:flex;gap:14px;flex-wrap:wrap}
.col{flex:1;min-width:260px}

.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(11,15,20,.7);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;padding:12px 18px;
  max-width:1100px;margin:0 auto;
}
.brand{
  display:flex;align-items:center;gap:10px;
  font-weight:700;letter-spacing:.3px;
}
.brand img{height:34px;width:auto;display:block;filter: drop-shadow(0 8px 20px rgba(0,0,0,.35))}
.nav{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.nav a{
  padding:9px 12px;border:1px solid transparent;border-radius:12px;
  color:var(--muted);
}
.nav a:hover{border-color:var(--line);color:var(--text);background:rgba(255,255,255,.03)}
.nav .btn-primary{color:#04101f;background:linear-gradient(90deg, var(--brand), #86c5ff);border:none}

h1,h2,h3{margin:0 0 10px 0}
h1{font-size:22px}
h2{font-size:18px;color:#d7e2ee}
p{color:var(--muted);line-height:1.55;margin:6px 0}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  gap:8px;
  padding:10px 14px;border-radius:12px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.03);
  color:var(--text);
  cursor:pointer;
}
.btn:hover{background:rgba(255,255,255,.06)}
.btn-primary{
  background:linear-gradient(90deg, var(--brand), #86c5ff);
  color:#04101f;border:none;font-weight:700;
}
.btn-danger{
  background:linear-gradient(90deg, var(--danger), #ff8a8a);
  color:#1b0b0b;border:none;font-weight:700;
}
.input, select, textarea{
  width:100%;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.02);
  color:var(--text);
  outline:none;
}
textarea{min-height:100px}
.label{font-size:13px;color:var(--muted);margin:10px 0 6px 2px}

.hr{height:1px;background:var(--line);margin:14px 0}
.badge{
  display:inline-block;
  padding:4px 10px;border-radius:999px;
  background:rgba(77,163,255,.12);
  border:1px solid rgba(77,163,255,.25);
  color:#bfe0ff;font-size:12px;
}
.alert{
  padding:10px 12px;border-radius:12px;border:1px solid var(--line);
  background:rgba(255,255,255,.03);margin:10px 0;
}
.alert.ok{border-color:rgba(34,197,94,.35);background:rgba(34,197,94,.08)}
.alert.warn{border-color:rgba(245,158,11,.35);background:rgba(245,158,11,.08)}
.alert.err{border-color:rgba(239,68,68,.35);background:rgba(239,68,68,.08)}
.small{font-size:12px;color:var(--muted)}

.footer{
  margin:18px auto 28px auto;
  max-width:1100px;padding:0 18px;
  color:var(--muted);font-size:12px;
}

/* ===== Chart containers (Chart.js canvas) ===== */
.chart-card{padding:14px}
.chart-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.chart-wrap{
  position:relative;
  height:320px;
  border-radius:14px;
  border:1px dashed rgba(154,164,178,.25);
  background:rgba(255,255,255,.02);
  padding:10px;
}
.chart-wrap.sm{height:220px}
.chart-wrap.lg{height:420px}
canvas{max-width:100%}

/* table (dùng cho báo cáo) */
.table{
  width:100%;
  border-collapse:separate;border-spacing:0;
  overflow:hidden;border-radius:14px;
  border:1px solid var(--line);
}
.table th, .table td{
  padding:10px 10px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.table th{color:#cfe0f2;text-align:left;background:rgba(255,255,255,.03)}
.table tr:last-child td{border-bottom:none}