:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-2: #243044;
  --text: #e7edf5;
  --muted: #94a3b8;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --success: #22c55e;
  --border: #334155;
  --radius: 12px;
  --font: "Segoe UI", system-ui, sans-serif;
  --mono: "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  background: linear-gradient(180deg, #0b1020 0%, var(--bg) 240px);
  color: var(--text);
  min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.5rem;
  background: rgba(15, 20, 25, 0.9);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
}
.brand { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; }
.brand-mark {
  background: var(--primary);
  color: white;
  padding: 0.2rem 0.45rem;
  border-radius: 6px;
  font-size: 0.75rem;
}
.nav { display: flex; gap: 0.5rem; flex: 1; flex-wrap: wrap; }
.nav-link {
  color: var(--muted);
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
}
.nav-link.active, .nav-link:hover {
  color: var(--text);
  background: var(--surface-2);
  text-decoration: none;
}
.user-menu { display: flex; align-items: center; gap: 0.75rem; }
.user-name { color: var(--muted); font-size: 0.9rem; }

.container { max-width: 1200px; margin: 0 auto; padding: 1.5rem; }
.hero h1 { margin: 0 0 0.25rem; font-size: 2rem; }
.lead, .subtitle, .help { color: var(--muted); }
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.stat-grid, .device-grid, .profile-grid, .quick-links, .gauge-grid {
  display: grid;
  gap: 1rem;
}
.stat-grid { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); margin: 1rem 0; }
.device-grid, .profile-grid { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.quick-links { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin-top: 1rem; }
.gauge-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.stat-card, .device-card, .profile-card, .quick-card, .gauge-card, .auth-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}
.quick-card { display: block; color: inherit; }
.quick-card:hover { border-color: var(--primary); text-decoration: none; }
.device-card { position: relative; }
.device-status {
  width: 10px; height: 10px; border-radius: 50%;
  position: absolute; top: 1rem; right: 1rem;
  background: #64748b;
}
.device-status.online { background: var(--success); box-shadow: 0 0 8px var(--success); }

.btn {
  border: none; border-radius: 8px; padding: 0.55rem 1rem;
  cursor: pointer; font: inherit;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: #334155; color: white; }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-block { width: 100%; }
.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.85rem; }
.badge { padding: 0.2rem 0.55rem; border-radius: 999px; font-size: 0.8rem; }
.badge-success { background: rgba(34,197,94,0.15); color: var(--success); }
.badge-muted { background: rgba(148,163,184,0.15); color: var(--muted); }

.data-table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.data-table th, .data-table td {
  text-align: left; padding: 0.65rem 0.5rem;
  border-bottom: 1px solid var(--border);
}
.mono, code, pre { font-family: var(--mono); }
.code-block {
  background: #0b1220; padding: 1rem; border-radius: 8px; overflow: auto;
}

.form label { display: block; margin-bottom: 0.75rem; }
.form input, .form select, .inline-form input, .inline-form select {
  width: 100%; margin-top: 0.25rem;
  background: #0b1220; color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 0.55rem;
}
.inline-form { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: end; }
.inline-form label { min-width: 140px; }
.wizard-form { max-width: 480px; }
.mode-buttons { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.detail-list { display: grid; grid-template-columns: 160px 1fr; gap: 0.5rem 1rem; }
.filters { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1rem; }
.filters input {
  flex: 1; min-width: 160px;
  background: #0b1220; color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 0.55rem;
}
.lab-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 1rem; }
@media (max-width: 900px) { .lab-grid { grid-template-columns: 1fr; } }
.lab-sidebar { max-height: 70vh; overflow: auto; }
.byte-cell {
  display: inline-block; min-width: 1.6rem; text-align: center;
  background: #0b1220; margin: 0.1rem; padding: 0.2rem; border-radius: 4px;
}
.heatmap-row { margin-bottom: 0.35rem; }
.mapper-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 900px) { .mapper-grid { grid-template-columns: 1fr; } }
.gauge-value { font-size: 2rem; font-weight: 700; margin: 0.5rem 0; }
.gauge-header { display: flex; justify-content: space-between; align-items: center; }
.gauge-unit { color: var(--muted); font-size: 0.85rem; }
.auth-card { max-width: 420px; margin: 4rem auto; }
.empty-state { color: var(--muted); }
.card-actions { display: flex; gap: 0.5rem; margin-top: 0.75rem; }
.preview-list { list-style: none; padding: 0; }
.preview-list li { padding: 0.35rem 0; border-bottom: 1px solid var(--border); }