:root{
  --bg:#eef2f7;--bg2:#dfe9f7;--card:#fff;--text:#1d2733;--muted:#5b6b7b;
  --primary:#1a6dd6;--primary-dark:#1558ad;--danger:#c62828;--danger-bg:#fdecea;
  --ok:#2e7d32;--ok-bg:#e8f5e9;--border:#d9e0e7;--shadow:0 10px 30px rgba(20,40,80,.12)
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0f1722;--bg2:#162234;--card:#1a2433;--text:#e6edf5;--muted:#9bacbd;
    --primary:#4d94f0;--primary-dark:#3a80dc;--danger:#ff8a80;--danger-bg:#3a1f22;
    --ok:#81c784;--ok-bg:#1d3322;--border:#2c3a4d;--shadow:0 10px 30px rgba(0,0,0,.45)
  }
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}

/* Trang đăng nhập / tạo tài khoản */
body.simple{
  display:flex;min-height:100vh;align-items:center;justify-content:center;padding:16px;
  background:linear-gradient(135deg,var(--bg) 0%,var(--bg2) 100%)
}
.card{
  background:var(--card);border:1px solid var(--border);border-radius:16px;
  padding:32px 28px;width:100%;max-width:400px;box-shadow:var(--shadow)
}
.brand-box{text-align:center;margin-bottom:24px}
.logo{
  width:56px;height:56px;margin:0 auto 12px;border-radius:14px;display:flex;
  align-items:center;justify-content:center;font-size:1.6rem;font-weight:700;color:#fff;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  box-shadow:0 6px 16px rgba(26,109,214,.35)
}
.brand-name{font-size:1.4rem;font-weight:700;margin:0}
.brand-sub{margin:4px 0 0;color:var(--muted);font-size:.9rem}
h1{font-size:1.4rem;margin:0 0 16px}
.card h1{font-size:1.15rem;text-align:center;margin:0 0 4px}

label{display:block;font-weight:600;font-size:.9rem;margin:16px 0 6px}
input[type=text],input[type=password]{
  width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:10px;
  font-size:1rem;background:var(--card);color:var(--text);transition:border-color .15s,box-shadow .15s
}
input::placeholder{color:var(--muted)}
input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(26,109,214,.25)}

button,.btn{
  display:block;width:100%;margin-top:24px;padding:12px 16px;border:0;border-radius:10px;
  background:var(--primary);color:#fff;font-size:1rem;font-weight:600;cursor:pointer;
  text-align:center;text-decoration:none;transition:background .15s,transform .05s
}
button:hover,.btn:hover{background:var(--primary-dark)}
button:active,.btn:active{transform:translateY(1px)}
button:focus-visible{outline:3px solid rgba(26,109,214,.4);outline-offset:2px}
button.link{display:inline;width:auto;margin:0;padding:0;background:none;color:var(--primary);font-weight:500;text-decoration:underline}
button.link:hover{background:none}

.error,.notice{padding:10px 14px;border-radius:10px;margin:16px 0 0;font-size:.92rem}
.error{background:var(--danger-bg);color:var(--danger)}
.notice{background:var(--ok-bg);color:var(--ok)}
.muted{color:var(--muted);font-size:.9rem}
.card p.muted{text-align:center;margin:4px 0 0}

/* Khung trang sau khi đăng nhập */
.page{width:100%;min-width:0;max-width:1100px;margin:0 auto;padding:24px 20px}

@media (max-width:420px){.card{padding:24px 18px;border-radius:12px}}

/* Menu và các thành phần của trang quản lý */
.page h1{font-size:1.4rem}
.left{text-align:left!important}
.panel{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px 20px;margin:16px 0}
.panel h2{font-size:1.05rem;margin:0 0 8px;display:flex;align-items:center;gap:8px}
.row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.row input[type=text]{flex:1;min-width:200px;width:auto}
.btn-inline,.btn-secondary,.btn-danger{display:inline-block;width:auto;margin:0;padding:10px 16px;border-radius:10px;font-size:.95rem}
.btn-secondary{background:transparent;color:var(--primary);border:1px solid var(--primary)}
.btn-secondary:hover{background:var(--bg)}
.btn-danger{background:transparent;color:var(--danger);border:1px solid var(--danger);padding:6px 12px}
.btn-danger:hover{background:var(--danger-bg)}
.is-busy button{opacity:.6;pointer-events:none}
.msg{margin-top:12px;padding:10px 14px;border-radius:10px;font-size:.92rem}
.msg.error{background:var(--danger-bg);color:var(--danger)}
.msg.notice{background:var(--ok-bg);color:var(--ok)}
.hidden{display:none}
.badge{background:var(--bg);border:1px solid var(--border);border-radius:999px;padding:0 10px;font-size:.85rem;font-weight:600}
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:.95rem}
th,td{padding:10px 8px;text-align:left;border-bottom:1px solid var(--border);white-space:nowrap}
th{font-size:.82rem;color:var(--muted);font-weight:600}
td.muted{white-space:normal}
.mono{font-family:ui-monospace,Menlo,Consolas,monospace}
.pill{display:inline-block;padding:2px 10px;border-radius:999px;font-size:.82rem;font-weight:600}
.pill-ok{background:var(--ok-bg);color:var(--ok)}
.pill-bad{background:var(--danger-bg);color:var(--danger)}
.pill-warn{background:#fff4e0;color:#b26a00}
.pill-other{background:var(--bg);color:var(--muted)}
@media (prefers-color-scheme:dark){.pill-warn{background:#3a2e17;color:#f0b35a}}

/* ===== Khung có thanh menu bên trái ===== */
:root{--side-w:248px;--side-bg:#12161f;--side-text:#c9d3e0;--side-muted:#7d8a9c;--side-hover:#1c2230;--side-active:#1a6dd6}
.shell{display:flex;min-height:100vh}
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.sidebar{
  width:var(--side-w);flex:none;background:var(--side-bg);color:var(--side-text);
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow-y:auto
}
.side-brand{display:flex;align-items:center;gap:12px;padding:20px 18px;text-decoration:none;color:#fff;border-bottom:1px solid #222a3a}
.logo-sm{
  width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:1.15rem;color:#fff;background:linear-gradient(135deg,#1a6dd6,#1558ad);flex:none
}
.side-brand-name{display:block;font-weight:700;font-size:1.02rem;line-height:1.2}
.side-brand-sub{display:block;font-size:.76rem;color:var(--side-muted);margin-top:2px}
.side-nav{flex:1;padding:16px 12px}
.side-label{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--side-muted);padding:0 10px 8px}
.nav-item{
  display:flex;align-items:center;gap:12px;padding:10px 12px;margin-bottom:2px;border-radius:10px;
  color:var(--side-text);text-decoration:none;font-size:.95rem;font-weight:500;transition:background .15s,color .15s
}
.nav-item svg{flex:none;opacity:.9}
.nav-item span{flex:1;min-width:0}
a.nav-item:hover{background:var(--side-hover);color:#fff}
.nav-item.active{background:var(--side-active);color:#fff}
.nav-item.disabled{color:var(--side-muted);cursor:not-allowed}
.nav-item small{font-size:.68rem;font-weight:600;color:var(--side-muted);border:1px solid #2c3548;border-radius:999px;padding:1px 8px;white-space:nowrap}
.side-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:0;padding:14px 18px;border-top:1px solid #222a3a}
.side-user{display:flex;align-items:center;gap:10px;min-width:0;color:#fff;font-size:.92rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.avatar{width:30px;height:30px;border-radius:50%;background:#2a3550;color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:600;font-size:.85rem;flex:none}
.side-logout{display:inline-block;width:auto;margin:0;padding:6px 10px;border:1px solid #2c3548;border-radius:8px;background:transparent;color:var(--side-text);font-size:.82rem;font-weight:500}
.side-logout:hover{background:var(--side-hover);color:#fff}

.mobilebar,.side-backdrop{display:none}

@media (max-width:860px){
  .sidebar{position:fixed;left:0;top:0;bottom:0;z-index:30;transform:translateX(-100%);transition:transform .2s ease;box-shadow:none}
  body.nav-open .sidebar{transform:translateX(0);box-shadow:0 0 40px rgba(0,0,0,.45)}
  .side-backdrop{display:block;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:20;opacity:0;pointer-events:none;transition:opacity .2s}
  body.nav-open .side-backdrop{opacity:1;pointer-events:auto}
  .mobilebar{display:flex;align-items:center;gap:12px;padding:10px 14px;background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
  .menu-toggle{width:auto;margin:0;padding:6px;background:transparent;color:var(--text);border-radius:8px;line-height:0}
  .menu-toggle:hover{background:var(--bg)}
  .mobilebar-title{font-weight:600}
  .page{padding:16px 14px}
}

/* Trang đồng bộ dữ liệu */
.num{text-align:right}
th.num{text-align:right}
.small{font-size:.8rem}
.btn-sm{padding:6px 12px;font-size:.85rem}
td.st{white-space:normal;min-width:140px}