:root {
  --bg: #0f172a;
  --sidebar: #111827;
  --panel: #ffffff;
  --page-bg: #f4f6fb;
  --border: #e2e8f0;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
  --info: #0891b2;
  --radius: 8px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--page-bg);
  color: var(--text);
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Login page ---- */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-box {
  background: var(--panel);
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  width: 340px;
}
.login-box h1 { font-size: 20px; margin-bottom: 4px; }
.login-box p.sub { color: var(--muted); margin-top: 0; font-size: 13px; }

/* ---- App shell ---- */
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px;
  background: var(--sidebar);
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  padding: 20px 14px;
  flex-shrink: 0;
}
.brand { color: #fff; font-weight: 700; font-size: 15px; margin-bottom: 4px; }
.nav-user { font-size: 12px; color: #94a3b8; margin-bottom: 20px; }
.role-tag {
  background: #1f2937;
  color: #93c5fd;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 10px;
  text-transform: uppercase;
  margin-left: 4px;
}
.nav-links { list-style: none; padding: 0; margin: 0; flex: 1; }
.nav-links li { margin-bottom: 2px; }
.nav-links a {
  display: block;
  padding: 8px 10px;
  border-radius: 6px;
  color: #cbd5e1;
  font-size: 13.5px;
}
.nav-links a:hover { background: #1f2937; text-decoration: none; color: #fff; }
.nav-divider {
  margin-top: 16px;
  padding: 4px 10px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #64748b;
}
.logout-link {
  display: block;
  padding: 8px 10px;
  color: #f87171;
  font-size: 13px;
}
.content { flex: 1; padding: 28px 34px; max-width: 1200px; }

h1.page-title { font-size: 22px; margin: 0 0 4px; }
p.page-sub { color: var(--muted); margin-top: 0; margin-bottom: 22px; font-size: 13.5px; }

/* ---- Cards / panels ---- */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}
.card h2 { font-size: 15px; margin: 0 0 14px; }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ---- Stat tiles ---- */
.stat-tile {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.stat-tile .num { font-size: 26px; font-weight: 700; }
.stat-tile .label { font-size: 12.5px; color: var(--muted); }

/* ---- SIM card ---- */
.sim-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  background: var(--panel);
}
.sim-card .sim-name { font-weight: 600; font-size: 14px; }
.sim-card .sim-meta { font-size: 12px; color: var(--muted); margin-top: 2px; }
.sim-card .signal-row { margin-top: 10px; display: flex; align-items: center; gap: 8px; }
.signal-bar-bg { background: #e5e7eb; border-radius: 4px; height: 8px; flex: 1; overflow: hidden; }
.signal-bar-fill { background: var(--success); height: 100%; }
.btn-refresh-signal { font-size: 11px; }

/* ---- Forms ---- */
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; margin-top: 12px; }
label:first-child { margin-top: 0; }
input[type=text], input[type=password], input[type=number], input[type=datetime-local],
select, textarea {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13.5px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
}
textarea { resize: vertical; min-height: 90px; }
.form-hint { font-size: 11.5px; color: var(--muted); margin-top: 4px; }
.checkbox-grid { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }
.checkbox-pill {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 10px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.checkbox-pill input { width: auto; }

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  padding: 9px 16px;
  border-radius: 6px;
  border: 1px solid transparent;
  background: var(--primary);
  color: #fff;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn-secondary { background: #fff; border-color: var(--border); color: var(--text); }
.btn-secondary:hover { background: #f3f4f6; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #b91c1c; }
.btn-sm { padding: 5px 10px; font-size: 12px; }

/* ---- Tabs ---- */
.tabs { display: flex; gap: 4px; margin-bottom: 18px; border-bottom: 1px solid var(--border); }
.tab-link {
  padding: 9px 16px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  cursor: pointer;
}
.tab-link.active { color: var(--primary); border-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---- Table ---- */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); }
th { font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); }
tr:hover td { background: #f9fafb; }

/* ---- Badges ---- */
.badge { padding: 2px 8px; border-radius: 20px; font-size: 11px; font-weight: 600; }
.badge-secondary { background: #e5e7eb; color: #374151; }
.badge-info { background: #cffafe; color: #0e7490; }
.badge-success { background: #dcfce7; color: #15803d; }
.badge-danger { background: #fee2e2; color: #b91c1c; }
.badge-muted { background: #f3f4f6; color: #9ca3af; }
.badge-warning { background: #fef3c7; color: #92400e; }

/* ---- Flash ---- */
.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; font-size: 13.5px; }
.flash-success { background: #dcfce7; color: #15803d; }
.flash-error { background: #fee2e2; color: #b91c1c; }
.flash-info { background: #dbeafe; color: #1e40af; }

/* ---- Filter bar ---- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; margin-bottom: 16px; }
.filter-bar > div { min-width: 150px; }
.filter-bar label { margin-top: 0; }

/* ---- Misc ---- */
.text-muted { color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.mt-0 { margin-top: 0; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.pagination-wrap { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 6px; }
.pill-note { font-size: 12px; background: #fef3c7; color: #92400e; padding: 8px 12px; border-radius: 6px; margin-bottom: 16px; }
.empty-state { text-align: center; padding: 40px 20px; color: var(--muted); }

/* ---- Truncated message cells (click to view full text) ---- */
.msg-cell { cursor: pointer; max-width: 320px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg-cell:hover { text-decoration: underline; text-decoration-style: dotted; text-decoration-color: var(--muted); }

/* ---- Message detail modal ---- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal-box {
  background: #fff;
  border-radius: 10px;
  max-width: 560px;
  width: 100%;
  max-height: 80vh;
  padding: 22px;
  position: relative;
  overflow: auto;
  box-shadow: 0 12px 40px rgba(0,0,0,0.25);
}
.modal-close {
  position: absolute;
  top: 10px;
  right: 12px;
  background: none;
  border: none;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  color: var(--muted);
  padding: 4px 8px;
}
.modal-close:hover { color: var(--text); }
.modal-meta { font-size: 12px; color: var(--muted); margin-bottom: 12px; padding-right: 20px; }
.modal-body { white-space: pre-wrap; word-break: break-word; font-size: 13.5px; line-height: 1.55; }

/* ---- AT Commands common-command cards ---- */
.cmd-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  cursor: pointer;
  background: #fff;
}
.cmd-card:hover { border-color: var(--primary); background: #f8fafc; }
.cmd-card-label { font-weight: 600; font-size: 13px; }
.cmd-card-code { font-size: 11.5px; color: var(--primary); margin-top: 2px; }
.cmd-card-desc { font-size: 11.5px; color: var(--muted); margin-top: 4px; line-height: 1.4; }