:root {
  --bg-color: #05070a;
  --panel-bg: #0d1117;
  --card-bg: #161b22;
  --text-main: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --border: rgba(255, 255, 255, 0.08);
  --app-border: rgba(56, 189, 248, 0.4);
  --app-glow: 0 0 25px rgba(56, 189, 248, 0.15), 0 30px 80px rgba(0, 0, 0, 0.9);
  --success: #4ade80;
  --warning: #f59e0b;
  --danger: #f87171;
  --bottom-nav-h: 62px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', 'Segoe UI', Helvetica, Arial, sans-serif;
}

html {
  height: -webkit-fill-available;
}

body, html {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-color);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
}

body {
  height: 100vh;
  height: 100dvh;
  height: -webkit-fill-available;
}

/* Respect reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

.app-container {
  position: relative;
  display: flex;
  width: 90vw;
  max-width: 1200px;
  height: 85vh;
  max-height: 900px;
  background: var(--panel-bg);
  border: 1.5px solid var(--app-border);
  border-radius: 24px;
  box-shadow: var(--app-glow);
  overflow: hidden;
  transition: all 0.3s ease;
}

/* Focus visibility for keyboard users */
a:focus-visible,
button:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============================================================
   Sidomeny — desktop: alltid synlig kolumn med flikväljare +
   nodlista. Mobil: blir en fullskärmssida för "Chattar"-sektionen
   (se media query längst ner), inte en overlay-drawer.
   ============================================================ */
.sidebar {
  width: 280px;
  flex-shrink: 0;
  background: transparent;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.nav-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
}

.nav-tab {
  flex: 1;
  padding: 16px 8px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s;
  border-bottom: 2px solid transparent;
}

.nav-tab:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.02);
}

.nav-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background: rgba(56, 189, 248, 0.05);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 10px 0;
}

.empty-state {
  padding: 20px 24px;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.chat-item {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: background 0.2s ease;
  position: relative;
}

.chat-item:hover {
  background: rgba(255, 255, 255, 0.03);
}

.chat-item:focus-visible {
  background: rgba(255, 255, 255, 0.04);
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.chat-item.active {
  background: rgba(56, 189, 248, 0.08);
}

.chat-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 15%;
  height: 70%;
  width: 3px;
  background-color: var(--accent);
  border-radius: 0 4px 4px 0;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--accent);
  flex-shrink: 0;
  position: relative;
  transition: opacity 0.2s ease;
}

.avatar.offline {
  opacity: 0.5;
}

/* Small presence dot on avatars in the chat list */
.avatar .presence-dot {
  position: absolute;
  bottom: -1px;
  right: -1px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--panel-bg);
  background: var(--text-muted);
}

.avatar .presence-dot.online { background: var(--success); }
.avatar .presence-dot.handshaking { background: var(--warning); }

.chat-info h4 {
  font-weight: 500;
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.chat-info small {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.offline-tag {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.8rem;
}

/* Huvudinnehållsytor */
.view-panel {
  flex: 1;
  display: none;
  flex-direction: column;
  height: 100%;
  background: transparent;
  overflow-y: auto;
  min-width: 0;
}

.view-panel.active {
  display: flex;
}

.panel-header {
  padding: 24px 30px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.panel-header h3 {
  font-weight: 500;
  font-size: 1.1rem;
}

/* Back button — takes the user from a full-screen mobile conversation
   back to the node list. Hidden on desktop, where the list is always
   visible alongside the conversation, so it would be redundant there. */
.back-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 6px;
  margin: -6px -2px -6px -6px;
  border-radius: 8px;
  flex-shrink: 0;
}

.back-btn:hover {
  background: rgba(255, 255, 255, 0.05);
}

/* Chattvy */
.messages-container {
  flex: 1;
  padding: 30px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message {
  max-width: 60%;
  padding: 14px 18px;
  border-radius: 16px;
  font-size: 0.9rem;
  line-height: 1.5;
  word-wrap: break-word;
}

.message.received {
  align-self: flex-start;
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text-main);
  border-bottom-left-radius: 4px;
}

.message.sent {
  align-self: flex-end;
  background: var(--accent);
  color: #000;
  font-weight: 500;
  border-bottom-right-radius: 4px;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.2);
}

.message.system {
  align-self: center;
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: center;
}

.message .msg-time {
  display: block;
  margin-top: 4px;
  font-size: 0.68rem;
  opacity: 0.6;
  font-weight: 400;
}

.message.sent .msg-time { text-align: right; }

/* Small inline loading spinner, e.g. inside buttons while connecting */
.spinner {
  display: inline-block;
  width: 13px;
  height: 13px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: -2px;
  margin-right: 6px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.chat-input-area {
  padding: 20px 30px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 15px;
  align-items: center;
  flex-shrink: 0;
}

.chat-input-area input, .form-control {
  flex: 1;
  padding: 14px 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text-main);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
  min-width: 0;
}

.chat-input-area input:focus, .form-control:focus {
  border-color: rgba(56, 189, 248, 0.5);
}

.chat-input-area input:disabled, .btn-accent:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-accent {
  padding: 14px 24px;
  border: none;
  border-radius: 12px;
  background: transparent;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid rgba(56, 189, 248, 0.3);
  white-space: nowrap;
}

.btn-accent:hover {
  background: rgba(56, 189, 248, 0.1);
  border-color: var(--accent);
}

.btn-accent.off {
  color: var(--text-muted);
  border-color: var(--border);
}

.input-row {
  display: flex;
  gap: 10px;
}

/* Inställningar & Status Paneler */
.content-body {
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.section-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section-card h4 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.toggle-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

/* Status Grid & Tabeller */
.status-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.stat-box {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-box .val {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-main);
}

.stat-box .lbl {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.table-scroll {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.mesh-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 0.85rem;
  text-align: left;
}

.mesh-table th {
  color: var(--text-muted);
  font-weight: 500;
  padding: 12px;
  border-bottom: 1px solid var(--border);
}

.mesh-table td {
  padding: 12px;
  border-bottom: 1px solid var(--border);
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success { background: rgba(74, 222, 128, 0.15); color: var(--success); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.badge-danger { background: rgba(248, 113, 113, 0.15); color: var(--danger); }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--card-bg);
  border: 1px solid var(--app-border);
  color: var(--text-main);
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  z-index: 200;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.08); border-radius: 3px; }

/* ============================================================
   Mobil bottennavigering — samma tre sektioner (Chattar / Status /
   Inställningar) som flikarna i sidomenyn, men inom tumräckhåll.
   Dold på desktop där sidomenyns flikar sköter navigeringen.
   ============================================================ */
.bottom-nav {
  display: none;
}

.bottom-nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 8px 4px;
  cursor: pointer;
}

.bottom-nav-btn svg { flex-shrink: 0; }

.bottom-nav-btn.active {
  color: var(--accent);
}

@media (max-width: 768px) {
  body { justify-content: stretch; align-items: stretch; }

  .app-container {
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    max-width: none;
    max-height: none;
    border-radius: 0;
    border: none;
    box-shadow: none;
    padding-bottom: calc(var(--bottom-nav-h) + var(--safe-bottom));
  }

  /* On mobile the sidebar isn't a persistent column or a drawer overlay —
     it IS the full-screen "Chattar" page, shown only when that section is
     active and no conversation is open (see JS: applyNavState). */
  .sidebar {
    display: none;
    width: 100%;
    border-right: none;
  }

  .sidebar.mobile-visible {
    display: flex;
  }

  .sidebar .nav-tabs { display: none; }

  .back-btn { display: inline-flex; align-items: center; justify-content: center; }

  .messages-container, .content-body { padding: 20px; }
  .message { max-width: 85%; }

  .panel-header {
    padding: calc(16px + var(--safe-top)) 16px 16px;
  }
  .sidebar-content { padding-top: calc(10px + var(--safe-top)); }

  .chat-input-area { padding: 14px 16px; }

  /* Prevent iOS Safari from auto-zooming the page on input focus */
  .chat-input-area input,
  .form-control {
    font-size: 16px;
  }

  .btn-accent { padding: 12px 18px; }

  .toast {
    left: 16px;
    right: 16px;
    transform: translateY(20px);
    text-align: center;
    bottom: calc(var(--bottom-nav-h) + var(--safe-bottom) + 16px);
  }

  .toast.show { transform: translateY(0); }

  .status-grid { grid-template-columns: 1fr 1fr; }

  .bottom-nav {
    display: flex;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: calc(var(--bottom-nav-h) + var(--safe-bottom));
    padding-bottom: var(--safe-bottom);
    background: var(--panel-bg);
    border-top: 1px solid var(--border);
    z-index: 50;
  }
}

@media (max-width: 420px) {
  .status-grid { grid-template-columns: 1fr; }
  .toggle-group { flex-direction: column; align-items: flex-start; }
  .toggle-group .btn-accent { align-self: flex-start; }
  .input-row { flex-direction: column; }
}

/* Landscape phones: bottom nav can crowd a short viewport, slim it down */
@media (max-width: 900px) and (max-height: 480px) and (orientation: landscape) {
  :root { --bottom-nav-h: 48px; }
  .bottom-nav-btn { flex-direction: row; gap: 6px; font-size: 0.7rem; }
  .panel-header { padding-top: 10px; padding-bottom: 10px; }
}