:root {
  --bg-primary: #0b141a;
  --bg-secondary: #111b21;
  --bg-card: #202c33;
  --bg-card-hover: #222e35;
  --border-color: #2a3942;
  --text-primary: #e9edef;
  --text-secondary: #8696a0;
  --accent-wa: #25d366;
  --accent-wa-hover: #1ebd5d;
  --accent-teal: #00a884;
  --accent-blue: #53bdeb;
  --accent-purple: #a855f7;
  --accent-red: #ea4335;
  --bubble-incoming: #202c33;
  --bubble-outgoing: #005c4b;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition: all 0.2s ease-in-out;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, #25d366, #128c7e);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 22px;
  box-shadow: 0 4px 14px rgba(37, 211, 102, 0.35);
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-text span {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
}

.status-badge.online {
  background: rgba(37, 211, 102, 0.15);
  border-color: rgba(37, 211, 102, 0.3);
  color: var(--accent-wa);
}

.status-badge.offline {
  background: rgba(234, 67, 53, 0.15);
  border-color: rgba(234, 67, 53, 0.3);
  color: var(--accent-red);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
}

/* Metrics Grid */
.metrics-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  padding: 1.25rem 1.5rem 0.5rem;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.metric-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.metric-card:hover {
  transform: translateY(-2px);
  border-color: rgba(37, 211, 102, 0.4);
}

.metric-info h3 {
  font-size: 0.78rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  font-weight: 600;
  margin-bottom: 4px;
}

.metric-info .number {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
}

.metric-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  background: rgba(255, 255, 255, 0.04);
}

/* Nav Tabs */
.tabs-nav {
  display: flex;
  gap: 8px;
  padding: 0.75rem 1.5rem 0;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 16px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: var(--accent-wa);
  border-bottom-color: var(--accent-wa);
}

/* Container */
.app-container {
  max-width: 1400px;
  margin: 1rem auto;
  padding: 0 1.5rem 2rem;
  width: 100%;
  flex: 1;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Panel Layouts */
.chat-dashboard {
  display: grid;
  grid-template-columns: 320px 1fr 380px;
  gap: 1rem;
  height: calc(100vh - 230px);
  min-height: 580px;
}

@media (max-width: 1100px) {
  .chat-dashboard {
    grid-template-columns: 1fr;
    height: auto;
  }
}

.panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-header {
  padding: 0.85rem 1.15rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.02);
}

.panel-header h2 {
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-body {
  padding: 1.15rem;
  overflow-y: auto;
  flex: 1;
}

/* Contacts List */
.contacts-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.contact-item {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: var(--transition);
  border-left: 3px solid transparent;
}

.contact-item:hover {
  background: var(--bg-card);
}

.contact-item.active {
  background: var(--bg-card);
  border-left-color: var(--accent-wa);
}

.contact-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #374248;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.contact-meta {
  flex: 1;
  min-width: 0;
}

.contact-name-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 2px;
}

.contact-name {
  font-weight: 600;
  font-size: 0.88rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.contact-time {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.contact-preview {
  font-size: 0.78rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.unread-badge {
  background: var(--accent-wa);
  color: #0b141a;
  font-size: 0.7rem;
  font-weight: 700;
  border-radius: 10px;
  padding: 2px 6px;
  margin-left: 6px;
}

/* Chat View */
.chat-window {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23182229' fill-opacity='0.4' fill-rule='evenodd'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/svg%3E"), var(--bg-primary);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.message-bubble {
  max-width: 75%;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  position: relative;
  font-size: 0.9rem;
  word-break: break-word;
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.message-bubble.incoming {
  align-self: flex-start;
  background: var(--bubble-incoming);
  border-top-left-radius: 2px;
}

.message-bubble.outgoing {
  align-self: flex-end;
  background: var(--bubble-outgoing);
  border-top-right-radius: 2px;
}

.bubble-sender {
  font-size: 0.72rem;
  color: var(--accent-wa);
  font-weight: 600;
  margin-bottom: 2px;
}

.bubble-text {
  color: var(--text-primary);
  line-height: 1.4;
  white-space: pre-wrap;
}

.bubble-meta {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  font-size: 0.68rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.status-tick {
  color: var(--text-secondary);
}

.status-tick.read {
  color: var(--accent-blue);
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.form-control {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.88rem;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-wa);
  box-shadow: 0 0 0 2px rgba(37, 211, 102, 0.2);
}

textarea.form-control {
  resize: vertical;
  min-height: 80px;
}

.btn {
  background: var(--accent-wa);
  color: #0b141a;
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition);
}

.btn:hover {
  background: var(--accent-wa-hover);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.78rem;
}

.btn-block {
  width: 100%;
}

/* Cards for Config & Guides */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-family: Consolas, Monaco, "Courier New", monospace;
  font-size: 0.85rem;
  overflow-x: auto;
  position: relative;
  color: #38bdf8;
  margin: 0.5rem 0;
}

.copy-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--text-primary);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Log viewer */
.log-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px;
  margin-bottom: 8px;
  font-size: 0.82rem;
}

.log-item-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
  font-weight: 600;
}

.log-payload {
  background: var(--bg-primary);
  padding: 8px;
  border-radius: 4px;
  font-family: Consolas, monospace;
  font-size: 0.75rem;
  color: #94a3b8;
  white-space: pre-wrap;
  max-height: 160px;
  overflow-y: auto;
}

/* Alerts */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.alert-warning {
  background: rgba(234, 179, 8, 0.15);
  border: 1px solid rgba(234, 179, 8, 0.3);
  color: #facc15;
}

.alert-info {
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #38bdf8;
}

.alert-success {
  background: rgba(37, 211, 102, 0.15);
  border: 1px solid rgba(37, 211, 102, 0.3);
  color: var(--accent-wa);
}

/* Tablas Modernas */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-top: 1rem;
}

.data-table th {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  text-align: left;
  padding: 10px 14px;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  vertical-align: middle;
}

.data-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
}

.badge-success {
  background: rgba(37, 211, 102, 0.15);
  color: var(--accent-wa);
  border: 1px solid rgba(37, 211, 102, 0.3);
}

.badge-danger {
  background: rgba(234, 67, 53, 0.15);
  color: var(--accent-red);
  border: 1px solid rgba(234, 67, 53, 0.3);
}

.badge-warning {
  background: rgba(234, 179, 8, 0.15);
  color: #facc15;
  border: 1px solid rgba(234, 179, 8, 0.3);
}

.badge-info {
  background: rgba(83, 189, 235, 0.15);
  color: var(--accent-blue);
  border: 1px solid rgba(83, 189, 235, 0.3);
}

/* Modales */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  width: 90%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  animation: modalScale 0.2s ease-out;
}

@keyframes modalScale {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.4rem;
  cursor: pointer;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 1.25rem;
}

.modal-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* Chat Quick Bar */
.chat-bottom-bar {
  padding: 10px 14px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 10px;
  align-items: center;
}

.chat-input-pill {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 10px 16px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.chat-input-pill:focus {
  border-color: var(--accent-wa);
}

.chat-send-circle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--accent-wa);
  color: #0b141a;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
}

.chat-send-circle:hover {
  background: var(--accent-wa-hover);
  transform: scale(1.05);
}

/* Sub-pestañas de documentación */
.doc-lang-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}

.doc-tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
}

.doc-tab-btn.active {
  background: var(--accent-wa);
  color: #0b141a;
  border-color: var(--accent-wa);
}