:root{
  --bg:#F8FAFD;
  --surface:#FFFFFF;
  --surface-sunken:#EFF3FA;
  --line:#DCE4F0;
  --ink:#1E293B;
  --ink-soft:#64748B;
  --ink-faint:#94A3B8;
  --accent:#2F6FED;
  --accent-deep:#2456BD;
  --accent-tint:#EAF1FE;
  --good:#4C7A51;
  --good-tint:#E9F2E8;
  --warn:#C1633D;
  --warn-tint:#FBEEE6;
  --critical:#B3392C;
  --critical-tint:#FBEAE7;
  --shadow: 0 1px 2px rgba(30,41,59,0.04), 0 8px 24px -12px rgba(30,41,59,0.12);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0F1620; --surface:#171F2C; --surface-sunken:#1D2634; --line:#2B3648;
    --ink:#E7ECF5; --ink-soft:#9FADC2; --ink-faint:#6E7C93;
    --accent:#6E9BF5; --accent-deep:#9CBEFA; --accent-tint:#1B2A46;
    --good:#83B389; --good-tint:#1B2C1E;
    --warn:#E3966D; --warn-tint:#3A2417;
    --critical:#E8897C; --critical-tint:#3A1D19;
    --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 24px -12px rgba(0,0,0,0.5);
  }
}
:root[data-theme="dark"]{
  --bg:#0F1620; --surface:#171F2C; --surface-sunken:#1D2634; --line:#2B3648;
  --ink:#E7ECF5; --ink-soft:#9FADC2; --ink-faint:#6E7C93;
  --accent:#6E9BF5; --accent-deep:#9CBEFA; --accent-tint:#1B2A46;
  --good:#83B389; --good-tint:#1B2C1E;
  --warn:#E3966D; --warn-tint:#3A2417;
  --critical:#E8897C; --critical-tint:#3A1D19;
  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 24px -12px rgba(0,0,0,0.5);
}

*{box-sizing:border-box;}
html,body{margin:0; padding:0;}
body{
  background:var(--bg); color:var(--ink);
  font-family:'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  line-height:1.55; -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
h1,h2,h3{font-family:'Roboto Serif', Georgia, serif; text-wrap:balance; color:var(--ink); margin:0;}
code, .mono{font-family:'JetBrains Mono', ui-monospace, monospace; font-variant-numeric:tabular-nums;}
[hidden]{display:none !important;}
/* Sans ce garde, .nav-item{display:block} (même spécificité que [hidden])
   l'emporterait selon l'ordre de la cascade et l'onglet resterait visible. */
.nav-item[hidden]{display:none !important;}
button{font-family:inherit;}

/* ---- shell ---- */
.shell{display:flex; min-height:100vh;}
.sidebar{
  width:210px; flex:none; background:var(--surface-sunken);
  border-right:1px solid var(--line); padding:20px 16px; display:flex; flex-direction:column;
}
.sidebar .brand{font-family:'Roboto Serif',serif; font-weight:600; font-size:16px; margin-bottom:20px; display:flex; align-items:center; gap:8px;}
.sidebar .nav-item{
  display:block; width:100%; text-align:left; border:none; background:none;
  padding:10px 12px; border-radius:8px; font-size:13.5px; color:var(--ink-soft);
  margin-bottom:4px; cursor:pointer;
}
.sidebar .nav-item:hover{background:var(--surface);}
.sidebar .nav-item.active{background:var(--accent); color:#fff; font-weight:600;}
.sidebar .nav-item.active:hover{background:var(--accent);}
.sidebar .nav-item:disabled{color:var(--ink-faint); cursor:not-allowed;}
.sidebar .nav-item:disabled:hover{background:none;}
.sidebar .spacer{flex:1;}
.sidebar .user{font-size:12px; color:var(--ink-faint); padding:10px 12px; border-top:1px solid var(--line); margin-top:8px;}
.sidebar .logout{
  margin-top:8px; padding:8px 12px; border-radius:8px; border:1px solid var(--line);
  background:var(--surface); color:var(--ink-soft); font-size:12.5px; cursor:pointer; text-align:left;
}
.sidebar .logout:hover{border-color:var(--critical); color:var(--critical);}

.main{flex:1; padding:36px 40px; max-width:900px;}
.main h1{font-size:26px; font-weight:600; margin-bottom:4px;}
.main .subtitle{color:var(--ink-soft); font-size:14px; margin-bottom:28px;}

/* ---- login screen ---- */
.login-screen{
  min-height:100vh; display:flex; align-items:center; justify-content:center; padding:24px;
}
.login-card{
  width:100%; max-width:380px; background:var(--surface); border:1px solid var(--line);
  border-radius:16px; padding:32px 30px; box-shadow:var(--shadow);
}
.login-card .brand{
  font-family:'Roboto Serif',serif; font-weight:600; font-size:22px; text-align:center; margin-bottom:6px;
}
.login-card .tagline{text-align:center; color:var(--ink-faint); font-size:12.5px; margin-bottom:24px;}
.field{margin-bottom:14px;}
.field label{display:block; font-size:12px; font-weight:600; color:var(--ink-soft); margin-bottom:5px;}
.field input{
  width:100%; padding:10px 12px; border-radius:9px; border:1px solid var(--line);
  background:var(--bg); color:var(--ink); font-size:14px; font-family:inherit;
}
.field input:focus{outline:2px solid var(--accent); outline-offset:1px; border-color:var(--accent);}
.btn-primary{
  width:100%; padding:11px; border-radius:9px; border:none; background:var(--accent);
  color:#fff; font-size:14px; font-weight:600; cursor:pointer; margin-top:6px;
}
.btn-primary:hover{background:var(--accent-deep);}
.btn-primary:disabled{opacity:0.6; cursor:default;}
.error-msg{
  background:var(--critical-tint); color:var(--critical); font-size:13px;
  padding:9px 12px; border-radius:8px; margin-bottom:14px;
}

/* ---- KPI cards ---- */
.kpi-row{display:grid; grid-template-columns:repeat(3,1fr); gap:14px; margin-bottom:28px;}
.kpi-card{background:var(--surface); border:1px solid var(--line); border-radius:14px; padding:18px 20px; box-shadow:var(--shadow);}
.kpi-card .label{font-size:11.5px; font-weight:600; text-transform:uppercase; letter-spacing:0.03em; color:var(--ink-faint); margin-bottom:8px;}
.kpi-card .value{font-family:'Roboto Serif',serif; font-size:28px; font-weight:600; color:var(--accent-deep); line-height:1.1;}
.kpi-card .sub{font-size:12.5px; color:var(--ink-soft); margin-top:6px;}

/* ---- break-even gauge ---- */
.card{background:var(--surface); border:1px solid var(--line); border-radius:14px; padding:22px 24px; box-shadow:var(--shadow); margin-bottom:20px;}
.card h2{font-size:16px; font-weight:600; margin-bottom:14px;}
.gauge-track{height:14px; border-radius:999px; background:var(--surface-sunken); overflow:hidden; position:relative;}
.gauge-fill{height:100%; background:var(--accent); border-radius:999px; transition:width 0.4s ease;}
.gauge-fill.good{background:var(--good);}
.gauge-labels{display:flex; justify-content:space-between; margin-top:8px; font-size:12.5px; color:var(--ink-soft);}
.gauge-labels b{color:var(--ink); font-weight:700;}

/* ---- plan breakdown table ---- */
.plan-table{width:100%; border-collapse:collapse; font-size:13.5px; margin-top:6px;}
.plan-table th, .plan-table td{text-align:left; padding:9px 10px; border-bottom:1px solid var(--line);}
.plan-table th{font-size:11px; text-transform:uppercase; letter-spacing:0.03em; color:var(--ink-faint); font-weight:700;}
.plan-table td.num{font-variant-numeric:tabular-nums; text-align:right;}

.loading, .empty-state{color:var(--ink-faint); font-size:13.5px; padding:20px 0; text-align:center;}

/* ---- HelpDesk: providers ---- */
.provider-grid{display:grid; grid-template-columns:repeat(auto-fill, minmax(150px,1fr)); gap:10px; margin-top:6px;}
.provider-card{border:1px solid var(--line); border-radius:10px; padding:12px 14px; background:var(--surface-sunken);}
.provider-card .name{font-size:13px; font-weight:700; color:var(--ink); margin-bottom:6px;}
.badge{display:inline-block; font-size:10.5px; font-weight:700; text-transform:uppercase; letter-spacing:0.03em; padding:2px 8px; border-radius:999px; margin-bottom:6px;}
.badge.ok{background:var(--good-tint); color:var(--good);}
.badge.warn{background:var(--warn-tint); color:var(--warn);}
.badge.critical{background:var(--critical-tint); color:var(--critical);}
.provider-card .stat-line{font-size:12px; color:var(--ink-soft);}

/* ---- HelpDesk: audit log ---- */
.log-table{width:100%; border-collapse:collapse; font-size:12.5px;}
.log-table th, .log-table td{text-align:left; padding:7px 9px; border-bottom:1px solid var(--line); vertical-align:top;}
.log-table th{font-size:10.5px; text-transform:uppercase; letter-spacing:0.03em; color:var(--ink-faint); font-weight:700;}
.log-table td.action{font-family:'JetBrains Mono',monospace; font-size:11.5px;}
.log-table td.action.warn-row{color:var(--warn); font-weight:600;}
.log-table td.time{color:var(--ink-faint); white-space:nowrap;}

@media (max-width:720px){
  .shell{flex-direction:column;}
  .sidebar{width:100%; flex-direction:row; align-items:center; padding:12px 16px; overflow-x:auto;}
  .sidebar .spacer{display:none;}
  .sidebar .user, .sidebar .logout{display:none;}
  .main{padding:24px 18px;}
  .kpi-row{grid-template-columns:1fr;}
}