:root {
  --bg: #0f172a;
  --card: #1e293b;
  --border: #334155;
  --text: #f8fafc;
  --muted: #94a3b8;
  --primary: #6366f1;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --sidebar-w: 240px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  height: 100vh;
  height: 100dvh; /* dynamic viewport for mobile */
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}

/* ─── Sidebar ──────────────────────────────────────────────────── */

aside {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: #090d16;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem;
  overflow-y: auto;
  z-index: 1000;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: #a855f7;
  margin-bottom: 2rem;
}

.sidebar-version {
  margin-top: auto;
  padding-top: 1rem;
  font-size: 0.7rem;
  color: var(--muted);
  opacity: 0.5;
  text-align: center;
}

nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

nav button {
  background: transparent;
  border: none;
  color: var(--muted);
  padding: 0.7rem 0.85rem;
  text-align: left;
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  transition: all 0.15s ease;
  white-space: nowrap;
}

nav button:hover,
nav button.active {
  background: var(--card);
  color: var(--text);
}

nav button.active {
  border-left: 3px solid var(--primary);
  background: linear-gradient(90deg, rgba(99,102,241,0.15) 0%, transparent 100%);
}

/* ─── Sidebar Overlay (mobile) ─────────────────────────────────── */

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 999;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sidebar-overlay.visible {
  opacity: 1;
}

/* ─── Hamburger Menu Button ────────────────────────────────────── */

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  transition: background 0.15s;
}

.hamburger:hover {
  background: var(--card);
}

/* ─── Main Content ─────────────────────────────────────────────── */

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  min-width: 0;
}

header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card);
  gap: 0.75rem;
  flex-shrink: 0;
}

header h1 {
  font-size: 1.2rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-badge {
  font-size: 0.8rem;
  background: #064e3b;
  color: #34d399;
  padding: 0.3rem 0.7rem;
  border-radius: 20px;
  white-space: nowrap;
  flex-shrink: 0;
}

.content {
  padding: 1.5rem;
  overflow-x: hidden;
}

.section {
  display: none;
}

.section.active {
  display: block;
}

/* ─── Stats Grid ───────────────────────────────────────────────── */

.grid-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem;
}

.stat-card .title {
  font-size: 0.8rem;
  color: var(--muted);
}

.stat-card .val {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 0.4rem;
}

/* ─── Tables ───────────────────────────────────────────────────── */

.table-container {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
  min-width: 600px;
}

th {
  background: #111827;
  padding: 0.8rem;
  color: var(--muted);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 0.8rem;
  border-bottom: 1px solid var(--border);
}

tr:hover {
  background: #26334d;
}

/* ─── Buttons ──────────────────────────────────────────────────── */

.btn {
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  border: none;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  touch-action: manipulation;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.96);
  opacity: 0.85;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-nuke {
  background: #7f1d1d;
  color: #fca5a5;
  border: 1px solid #991b1b;
}

.btn-nuke:hover {
  background: #991b1b;
  color: white;
}

/* ─── Forms ────────────────────────────────────────────────────── */

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  margin-bottom: 0.4rem;
  color: var(--muted);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.65rem;
  background: #0f172a;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  touch-action: manipulation;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(99,102,241,0.25);
}

/* ─── Scrollbars ───────────────────────────────────────────────── */

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

/* ─── PWA Install Banner ───────────────────────────────────────── */

.pwa-install-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 2000;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.4);
}

.pwa-install-banner button {
  background: white;
  color: #6366f1;
  border: none;
  padding: 0.5rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

/* ───────────────────────────────────────────────────────────────── */
/* ─── RESPONSIVE: Mobile ≤768px ────────────────────────────────── */
/* ───────────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
  body {
    flex-direction: column;
  }

  /* Sidebar becomes off-canvas drawer */
  aside {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 260px;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 4px 0 24px rgba(0,0,0,0.5);
  }

  aside.open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    display: block;
    pointer-events: none;
  }

  .sidebar-overlay.visible {
    pointer-events: auto;
  }

  .hamburger {
    display: block;
  }

  main {
    width: 100%;
    height: 100vh;
    height: 100dvh;
  }

  header {
    padding: 0.75rem 1rem;
  }

  header h1 {
    font-size: 1rem;
  }

  .content {
    padding: 1rem;
  }

  .grid-stats {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
  }

  .stat-card {
    padding: 0.85rem;
  }

  .stat-card .val {
    font-size: 1.25rem;
  }

  .stat-card .title {
    font-size: 0.72rem;
  }

  /* Tables scroll horizontally */
  table {
    font-size: 0.78rem;
    min-width: 500px;
  }

  th, td {
    padding: 0.6rem;
  }

  /* Action grids stack */
  .section div[style*="grid-template-columns: 1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }

  /* Stat cards with grid-column span 2 */
  .stat-card[style*="grid-column: span 2"] {
    grid-column: span 1 !important;
  }

  /* Buttons smaller on mobile */
  .btn {
    padding: 0.4rem 0.65rem;
    font-size: 0.75rem;
  }

  /* Form group inline grids */
  div[style*="grid-template-columns: 1fr 1fr"][style*="gap"] {
    grid-template-columns: 1fr !important;
  }

  /* PapuWhats conversation selector */
  #tab-papuwhats > div:first-child {
    flex-direction: column !important;
  }
}

/* ─── RESPONSIVE: Extra small ≤480px ───────────────────────────── */

@media (max-width: 480px) {
  .grid-stats {
    grid-template-columns: 1fr;
  }

  .stat-card .val {
    font-size: 1.1rem;
  }

  header h1 {
    font-size: 0.9rem;
  }

  .content {
    padding: 0.75rem;
  }

  .status-badge {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
  }
}