:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #1c2733;
  --muted: #64748b;
  --line: #e2e8f0;
  --brand: #0f4c5c;
  --brand-ink: #ffffff;
  --accent: #e36414;
  --good: #1a7f4b;
  --warn: #b45309;
  --bad: #b42318;
  --soft: #eef4f6;
}

* { box-sizing: border-box; }
html { font-size: 15px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; line-height: 1.45;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.45rem; margin: 0; }
h2 { font-size: 1.05rem; margin: 0 0 .75rem; }

/* Khung trang */
.layout { display: grid; grid-template-columns: 232px minmax(0, 1fr); min-height: 100vh; }
.sidebar { background: var(--brand); color: var(--brand-ink); padding: 1.1rem .8rem; display: flex; flex-direction: column; gap: 1rem; }
.brand { font-weight: 700; font-size: 1.05rem; padding: 0 .5rem; }
.brand small { display: block; font-weight: 400; opacity: .75; font-size: .8rem; }
.brand img { float: left; margin: .1rem .6rem 0 0; }
.nav { display: flex; flex-direction: column; gap: .15rem; }
.nav-title { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; opacity: .6; padding: .7rem .5rem .25rem; }
.nav a { color: var(--brand-ink); padding: .5rem .6rem; border-radius: 6px; opacity: .88; }
.nav a:hover { background: rgba(255, 255, 255, .12); text-decoration: none; opacity: 1; }
.nav a.active { background: rgba(255, 255, 255, .2); opacity: 1; font-weight: 600; }
.sidebar-foot { margin-top: auto; font-size: .85rem; padding: 0 .5rem; opacity: .9; }
.sidebar-foot button { background: none; border: 0; color: inherit; padding: 0; cursor: pointer; text-decoration: underline; font: inherit; }
.main { padding: 1.4rem 1.6rem 3rem; min-width: 0; }

.page-head { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1rem; margin-bottom: 1.1rem; }
.page-head .spacer { flex: 1; }
.sub { color: var(--muted); font-size: .9rem; }
.badge-demo {
  background: #fff4e5; color: var(--warn); border: 1px solid #f5d0a0; border-radius: 999px;
  padding: .15rem .65rem; font-size: .78rem; font-weight: 600; white-space: nowrap;
}

/* Thẻ số liệu */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: .9rem; margin-bottom: 1.1rem; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: .9rem 1rem; }
.card .label { color: var(--muted); font-size: .82rem; }
.card .value { font-size: 1.45rem; font-weight: 700; margin-top: .15rem; }
.card .value small { font-size: .8rem; font-weight: 500; color: var(--muted); }
.card .hint { color: var(--muted); font-size: .8rem; margin-top: .2rem; }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 1rem; margin-bottom: 1.1rem; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 1.1rem; }
.grid-2 > .panel { margin-bottom: 0; }
.grid-2 { margin-bottom: 1.1rem; }

/* Bảng */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { padding: .5rem .6rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: .8rem; white-space: nowrap; background: #fafbfc; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tr.group td { background: var(--soft); font-weight: 600; }
tr.total td { font-weight: 700; border-top: 2px solid var(--line); background: #fafbfc; }
tr.highlight td { background: #fff8ed; font-weight: 700; }
td.actions { white-space: nowrap; text-align: right; }
td.actions form { display: inline; }
.empty { color: var(--muted); padding: 1.2rem; text-align: center; }

.in { color: var(--good); }
.out { color: var(--bad); }
.tag { display: inline-block; padding: .05rem .5rem; border-radius: 999px; font-size: .76rem; font-weight: 600; background: var(--soft); color: var(--brand); }
.tag.good { background: #e7f6ee; color: var(--good); }
.tag.warn { background: #fff4e5; color: var(--warn); }
.tag.bad { background: #fdecea; color: var(--bad); }

.bar { background: var(--line); border-radius: 999px; height: 7px; min-width: 70px; overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--brand); }

/* Biểu mẫu */
.filters { display: flex; flex-wrap: wrap; gap: .6rem .8rem; align-items: flex-end; }
.filters .field { margin: 0; min-width: 150px; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: .9rem 1rem; }
.field { display: flex; flex-direction: column; gap: .25rem; }
.field.wide { grid-column: 1 / -1; }
label { font-size: .82rem; font-weight: 600; color: #334155; }
.req { color: var(--bad); }
input, select, textarea {
  font: inherit; padding: .5rem .6rem; border: 1px solid #cbd5e1; border-radius: 6px; background: #fff; color: var(--ink); width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid #7fb3c0; outline-offset: 0; border-color: var(--brand); }
.field small { color: var(--muted); font-size: .78rem; }
.errorlist { list-style: none; margin: 0; padding: 0; color: var(--bad); font-size: .82rem; }
.has-error input, .has-error select { border-color: var(--bad); }
.form-actions { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.1rem; }

.btn {
  display: inline-block; border: 1px solid var(--brand); background: var(--brand); color: #fff; border-radius: 6px;
  padding: .5rem .95rem; font: inherit; font-weight: 600; cursor: pointer; white-space: nowrap;
}
.btn:hover { text-decoration: none; filter: brightness(1.1); }
.btn.secondary { background: #fff; color: var(--brand); }
.btn.accent { background: var(--accent); border-color: var(--accent); }
.btn.link { background: none; border: 0; color: var(--bad); padding: 0 .2rem; font-weight: 500; }

.messages { list-style: none; margin: 0 0 1rem; padding: 0; }
.messages li { background: #e7f6ee; border: 1px solid #b7e1c8; color: #14532d; padding: .55rem .8rem; border-radius: 6px; }
.note { background: #fff8ed; border: 1px solid #f5d0a0; border-radius: 8px; padding: .7rem .9rem; font-size: .9rem; margin-bottom: 1.1rem; }

/* Đăng nhập */
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 1rem; }
.login-box { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 1.8rem; width: 100%; max-width: 380px; }
.login-box h1 { margin-bottom: .2rem; }
.login-box .field { margin-top: .9rem; }
.login-box .btn { width: 100%; margin-top: 1.2rem; }

@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { flex-direction: row; flex-wrap: wrap; align-items: center; padding: .6rem .8rem; gap: .4rem; }
  .nav { flex-direction: row; flex-wrap: wrap; }
  .nav-title { display: none; }
  .sidebar-foot { margin: 0 0 0 auto; }
  .main { padding: 1rem .8rem 2rem; }
}

@media print {
  .sidebar, .no-print { display: none !important; }
  .layout { display: block; }
  body { background: #fff; }
  .main { padding: 0; }
  .panel { border: 0; padding: 0; }
}