/* ===== Giao diện phần mềm quản lý ===== */
:root{
  --xanh:#1668dc; --xanh-dam:#0f4c9c; --nen:#f4f6fa; --trang:#fff;
  --chu:#1f2937; --chu-nhat:#6b7280; --vien:#e5e7eb;
  --do:#dc2626; --xanhla:#16a34a; --cam:#d97706; --tim:#7c3aed;
  --bong:0 1px 3px rgba(16,24,40,.08),0 1px 2px rgba(16,24,40,.06);
}
*{box-sizing:border-box}
body{margin:0;font-family:"Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;background:var(--nen);color:var(--chu);font-size:14px}
button,input,select,textarea{font-family:inherit;font-size:14px}
a{color:var(--xanh);text-decoration:none}

/* ===== Đăng nhập ===== */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#1668dc 0%,#0b2f63 100%);padding:16px}
.login-box{background:#fff;border-radius:16px;padding:32px 28px;width:100%;max-width:380px;box-shadow:0 20px 50px rgba(0,0,0,.25)}
.login-logo{font-size:44px;text-align:center}
.login-box h1{font-size:19px;text-align:center;margin:8px 0 2px}
.login-box .sub{text-align:center;color:var(--chu-nhat);margin:0 0 20px;font-size:13px}
.login-box label{display:block;font-weight:600;margin:12px 0 5px;font-size:13px}
.login-box input{width:100%;padding:11px 12px;border:1px solid var(--vien);border-radius:9px}
.login-box input:focus{outline:none;border-color:var(--xanh);box-shadow:0 0 0 3px rgba(22,104,220,.12)}
.login-box .err{color:var(--do);font-size:13px;min-height:18px;margin-top:10px}
.login-box .hint{font-size:12px;color:var(--chu-nhat);text-align:center;margin:14px 0 0}

/* ===== Khung ===== */
#app{display:flex;min-height:100vh}
.sidebar{width:232px;background:#0f172a;color:#cbd5e1;display:flex;flex-direction:column;position:fixed;top:0;bottom:0;left:0;z-index:30}
.brand{display:flex;gap:10px;align-items:center;padding:16px 14px;border-bottom:1px solid #1e293b}
.brand .logo{font-size:26px}
.brand b{display:block;color:#fff;font-size:14px;line-height:1.2}
.brand small{color:#94a3b8;font-size:11px}
#menu{flex:1;overflow:auto;padding:8px}
#menu a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:9px;color:#cbd5e1;font-weight:500;margin-bottom:2px}
#menu a:hover{background:#1e293b;color:#fff}
#menu a.active{background:var(--xanh);color:#fff}
#menu .nhom{font-size:11px;text-transform:uppercase;color:#64748b;padding:12px 12px 6px;letter-spacing:.5px}
.user-box{display:flex;align-items:center;gap:9px;padding:12px;border-top:1px solid #1e293b}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--xanh);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.user-box .info{flex:1;min-width:0}
.user-box b{display:block;color:#fff;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.user-box small{color:#94a3b8;font-size:11px}
.main{flex:1;margin-left:232px;min-width:0;display:flex;flex-direction:column}
.topbar{height:56px;background:#fff;border-bottom:1px solid var(--vien);display:flex;align-items:center;gap:12px;padding:0 18px;position:sticky;top:0;z-index:20}
.topbar h2{font-size:17px;margin:0}
.spacer{flex:1}
.today{color:var(--chu-nhat);font-size:13px}
.menu-toggle{display:none}
.page{padding:18px;flex:1}

/* ===== Thành phần ===== */
.icon-btn{background:transparent;border:none;color:inherit;cursor:pointer;font-size:17px;padding:6px;border-radius:8px}
.icon-btn:hover{background:rgba(148,163,184,.2)}
.btn{border:1px solid var(--vien);background:#fff;padding:8px 14px;border-radius:9px;cursor:pointer;font-weight:600;color:var(--chu)}
.btn:hover{background:#f8fafc}
.btn.primary{background:var(--xanh);border-color:var(--xanh);color:#fff}
.btn.primary:hover{background:var(--xanh-dam)}
.btn.danger{background:var(--do);border-color:var(--do);color:#fff}
.btn.ghost{background:transparent}
.btn.big{width:100%;padding:11px;margin-top:16px}
.btn.sm{padding:5px 10px;font-size:13px;border-radius:7px}
.card{background:#fff;border:1px solid var(--vien);border-radius:12px;box-shadow:var(--bong);margin-bottom:16px}
.card-head{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--vien);flex-wrap:wrap}
.card-head h3{margin:0;font-size:15px}
.card-body{padding:14px 16px}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:12px}
.toolbar input,.toolbar select{padding:8px 10px;border:1px solid var(--vien);border-radius:9px;background:#fff}
.search{min-width:220px}

table{width:100%;border-collapse:collapse}
th,td{padding:9px 12px;text-align:left;border-bottom:1px solid var(--vien);white-space:nowrap}
th{background:#f8fafc;font-size:12px;text-transform:uppercase;color:var(--chu-nhat);letter-spacing:.3px}
tbody tr:hover{background:#f8fafc}
td.num,th.num{text-align:right}
.table-wrap{overflow:auto;border-radius:12px}
.empty{padding:30px;text-align:center;color:var(--chu-nhat)}

.tag{display:inline-block;padding:2px 9px;border-radius:99px;font-size:12px;font-weight:600;background:#eef2ff;color:#4338ca}
.tag.green{background:#dcfce7;color:#15803d}
.tag.red{background:#fee2e2;color:#b91c1c}
.tag.orange{background:#ffedd5;color:#c2410c}
.tag.gray{background:#f1f5f9;color:#475569}

.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px;margin-bottom:18px}
.stat{background:#fff;border:1px solid var(--vien);border-radius:12px;padding:14px 16px;box-shadow:var(--bong)}
.stat .label{color:var(--chu-nhat);font-size:12px;text-transform:uppercase;letter-spacing:.3px}
.stat .value{font-size:23px;font-weight:700;margin-top:4px}
.stat .value.blue{color:var(--xanh)}
.stat .value.green{color:var(--xanhla)}
.stat .value.orange{color:var(--cam)}
.stat .value.purple{color:var(--tim)}

/* Form trong modal */
.modal-bg{position:fixed;inset:0;background:rgba(15,23,42,.45);display:flex;align-items:flex-start;justify-content:center;padding:24px 12px;z-index:60;overflow:auto}
.modal{background:#fff;border-radius:14px;width:100%;max-width:640px;box-shadow:0 24px 60px rgba(0,0,0,.3)}
.modal.wide{max-width:960px}
.modal-head{display:flex;align-items:center;padding:14px 18px;border-bottom:1px solid var(--vien)}
.modal-head h3{margin:0;font-size:16px;flex:1}
.modal-body{padding:16px 18px;max-height:70vh;overflow:auto}
.modal-foot{display:flex;justify-content:flex-end;gap:8px;padding:12px 18px;border-top:1px solid var(--vien)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.field{display:flex;flex-direction:column;gap:5px;margin-bottom:10px}
.field label{font-weight:600;font-size:13px}
.field input,.field select,.field textarea{padding:9px 10px;border:1px solid var(--vien);border-radius:9px;width:100%;background:#fff}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--xanh);box-shadow:0 0 0 3px rgba(22,104,220,.12)}
.field .goi-y{font-size:12px;color:var(--chu-nhat)}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(120px);background:#0f172a;color:#fff;padding:11px 18px;border-radius:10px;z-index:100;transition:.25s;opacity:0}
.toast.show{transform:translateX(-50%) translateY(0);opacity:1}
.toast.err{background:var(--do)}

.row-actions{display:flex;gap:6px}
.muted{color:var(--chu-nhat)}
.right{text-align:right}
.bold{font-weight:700}
.warn-box{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:10px 14px;margin-bottom:14px;color:#92400e}

@media(max-width:900px){
  .sidebar{transform:translateX(-100%);transition:.2s}
  .sidebar.open{transform:none}
  .main{margin-left:0}
  .menu-toggle{display:block}
  .grid2,.grid3{grid-template-columns:1fr}
}
@media print{
  .sidebar,.topbar,.toolbar,.row-actions,.modal-foot{display:none!important}
  .main{margin:0}
}