/* ═══════════════════════════════════════════════════════════
   LAYOUT.CSS — Navigation, Main, Pages, Grids, Panels
   ═══════════════════════════════════════════════════════════ */

/* ── Login Screen ───────────────────────────────────────── */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}
.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
}
.login-card h1 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--accent);
}
.login-card p.sub {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1.75rem;
}

/* ── Navigation ─────────────────────────────────────────── */
nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  height: 52px;
}
nav .logo {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--accent);
  cursor: pointer;
  text-decoration: none;
  margin-right: 2rem;
  letter-spacing: 0.03em;
}
nav .logo span { color: var(--text-muted); font-weight: 400; }
.nav-links { display: flex; align-items: center; gap: 0.25rem; flex: 1; }
.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
}
.nav-links a:hover { color: var(--text); background: var(--surface2); }
.nav-links a.active { color: var(--accent); background: rgba(88, 166, 255, 0.1); }
.nav-right { display: flex; align-items: center; gap: 0.75rem; margin-left: auto; }

/* ── Main Content ───────────────────────────────────────── */
main {
  flex: 1;
  padding: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

/* ── Pages (view toggle) ────────────────────────────────── */
.page { display: none; }
.page.visible { display: block; }

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.page-header h1 { font-size: 1.3rem; font-weight: 600; }
.page-header p { color: var(--text-muted); font-size: 0.85rem; }

/* ── Stats Grid ─────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}
@media (max-width: 640px) { .stats-grid { grid-template-columns: 1fr; } }

/* ── Device Overview Grid ───────────────────────────────── */
.device-overview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}
@media (max-width: 1100px) { .device-overview-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .device-overview-grid { grid-template-columns: 1fr; } }

/* ── Admin Grid ─────────────────────────────────────────── */
.admin-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 640px) { .admin-grid { grid-template-columns: 1fr; } }

/* ── Panels ─────────────────────────────────────────────── */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}
.panel h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Fieldset ───────────────────────────────────────────── */
.fieldset {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
}
.fieldset legend {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}
.fieldset .field { margin-bottom: 0.75rem; }
.fieldset .field:last-of-type { margin-bottom: 0.85rem; }

/* ── Chart Panel ────────────────────────────────────────── */
.chart-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}
.chart-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.chart-toolbar h2 { font-size: 1rem; font-weight: 600; flex: 1; }
.chart-wrap { position: relative; height: 320px; }

/* ── View Tabs ──────────────────────────────────────────── */
.view-tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.tab-btn {
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-muted);
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
}
.tab-btn.active { background: rgba(88, 166, 255, 0.12); color: var(--accent); border-color: rgba(88, 166, 255, 0.35); }
.view-panel { display: none; }
.view-panel.active { display: block; }

/* ── Live Log ───────────────────────────────────────────── */
.log-panel {
  background: #0b0f14;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem;
  min-height: 320px;
  max-height: 420px;
  overflow: auto;
  font-family: Consolas, Monaco, monospace;
  font-size: 0.85rem;
  line-height: 1.45;
  color: #c9d1d9;
}
.log-line { margin-bottom: 0.35rem; white-space: pre-wrap; }
.log-line small { color: var(--text-muted); }

/* ── Tables ─────────────────────────────────────────────── */
table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
thead th {
  text-align: left;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}
tbody td { padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--border); }
tbody tr:last-child td { border-bottom: none; }
.actions-cell { display: flex; gap: 0.4rem; }

/* ── Select Wrapper ─────────────────────────────────────── */
.select-wrap { position: relative; }
.select-wrap select {
  appearance: none;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: inherit;
  font-size: 0.85rem;
  padding: 0.5rem 2rem 0.5rem 0.85rem;
  border-radius: 8px;
  cursor: pointer;
}
.select-wrap select:focus { outline: none; border-color: var(--accent); }
.select-wrap::after {
  content: '▾';
  position: absolute;
  right: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--text-muted);
  font-size: 0.75rem;
}