:root {
  /* Colors - Slate & Cyan Security Theme */
  --color-bg-base: #0f172a; /* Slate 900 */
  --color-bg-panel: #1e293b; /* Slate 800 */
  --color-bg-element: #334155; /* Slate 700 */
  --color-bg-element-hover: #475569; /* Slate 600 */
  
  --color-text-primary: #f8fafc; /* Slate 50 */
  --color-text-secondary: #94a3b8; /* Slate 400 */
  --color-text-muted: #64748b; /* Slate 500 */
  
  --color-accent-cyan: #06b6d4; /* Cyan 500 */
  --color-accent-cyan-hover: #0891b2; /* Cyan 600 */
  --color-accent-cyan-light: #22d3ee; /* Cyan 400 */
  
  --color-status-online: #34d399; /* Emerald 400 */
  --color-status-online-bg: rgba(16, 185, 129, 0.2);
  --color-status-offline: #fbbf24; /* Amber 400 */
  --color-status-offline-bg: rgba(245, 158, 11, 0.2);
  --color-status-danger: #fb7185; /* Rose 400 */
  --color-status-danger-bg: rgba(225, 29, 72, 0.2);
  
  --color-border: #334155; /* Slate 700 */
  --color-overlay: rgba(2, 6, 23, 0.8); /* Slate 950 */
  
  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', monospace;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  
  /* Radii */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Z-Index */
  --z-sidebar: 30;
  --z-overlay: 40;
  --z-modal: 50;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-base);
  color: var(--color-text-primary);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  color: inherit;
}

input, textarea, select {
  font-family: inherit;
  border: none;
  outline: none;
}

/* Utilities */
.text-cyan { color: var(--color-accent-cyan-light); }
.text-muted { color: var(--color-text-muted); }
.font-mono { font-family: var(--font-mono); }
.is-hidden { display: none !important; }

/* Custom Scrollbar */
.custom-scrollbar::-webkit-scrollbar { width: 6px; }
.custom-scrollbar::-webkit-scrollbar-track { background: transparent; }
.custom-scrollbar::-webkit-scrollbar-thumb { 
  background: var(--color-bg-element); 
  border-radius: var(--radius-full); 
}

/* 
  BLOCK: app-header 
*/
.app-header {
  background-color: var(--color-bg-panel);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-3) var(--spacing-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  flex-wrap: wrap;
  gap: var(--spacing-3);
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.app-header__icon {
  font-size: 1.5rem;
}

.app-header__title {
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1.2;
}

.app-header__subtitle {
  font-size: 0.75rem;
  color: var(--color-accent-cyan-light);
  font-weight: 500;
}

/* 
  BLOCK: nav-tabs 
*/
.nav-tabs {
  display: flex;
  background-color: var(--color-bg-base);
  padding: var(--spacing-1);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  gap: var(--spacing-1);
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-tabs::-webkit-scrollbar { display: none; }

.nav-tabs__btn {
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-lg);
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.nav-tabs__btn:hover {
  color: var(--color-text-primary);
}

.nav-tabs__btn--active {
  background-color: var(--color-accent-cyan);
  color: #fff;
}

.nav-tabs__btn--active:hover {
  color: #fff;
}

/* 
  BLOCK: main-content 
*/
.main-content {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.view-section {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
}

.view-section--scrollable {
  padding: var(--spacing-4);
  overflow-y: auto;
  display: block;
}

@media (min-width: 640px) {
  .view-section--scrollable { padding: var(--spacing-6); }
}

/* 
  BLOCK: chat-view 
*/
.chat-view {
  flex-direction: row;
}

/* 
  BLOCK: sidebar 
*/
.sidebar {
  width: 100%;
  background-color: var(--color-bg-panel);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: var(--z-sidebar);
  transition: transform 0.3s ease;
  transform: translateX(-100%);
}

.sidebar--open {
  transform: translateX(0);
}

@media (min-width: 768px) {
  .sidebar {
    width: 20rem; /* 320px */
    position: relative;
    transform: none;
    transition: none;
  }
}

.sidebar__header {
  padding: var(--spacing-3);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar__title {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.sidebar__actions {
  display: flex;
  gap: var(--spacing-2);
}

.action-btn {
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  background-color: var(--color-bg-element);
  color: var(--color-text-primary);
}

.action-btn:hover { background-color: var(--color-accent-cyan); }
.action-btn--emerald {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--color-status-online);
}
.action-btn--emerald:hover { background-color: #10b981; color: #fff; }

.sidebar__search {
  padding: var(--spacing-3);
  border-bottom: 1px solid var(--color-border);
}

.search-input {
  width: 100%;
  background-color: var(--color-bg-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-2) var(--spacing-3);
  color: var(--color-text-primary);
  font-size: 0.75rem;
  transition: border-color 0.2s;
}
.search-input:focus { border-color: var(--color-accent-cyan); }

.contact-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-2);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.contact-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-3);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: background-color 0.2s;
  border-left: 4px solid transparent;
}

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

.contact-item--active {
  background-color: rgba(51, 65, 85, 0.8);
  border-left-color: var(--color-accent-cyan);
}

.contact-item__body {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  min-width: 0;
  flex: 1;
}

.avatar {
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-base);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.75rem;
  flex-shrink: 0;
}
.avatar--active-chat { background-color: var(--color-bg-element); border-color: transparent;}

.status-dot {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 0.625rem;
  height: 0.625rem;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg-panel);
}
.status-dot--online { background-color: var(--color-status-online); }
.status-dot--offline { background-color: var(--color-text-muted); }

.contact-item__info { min-width: 0; flex: 1; }
.contact-item__name-row { display: flex; justify-content: space-between; align-items: center; }
.contact-item__name { font-weight: 500; font-size: 0.75rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.contact-item__status { font-size: 0.6875rem; color: var(--color-text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 0.125rem; }

.badge-queue {
  background-color: var(--color-status-offline-bg);
  color: var(--color-status-offline);
  font-size: 0.625rem;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-unread {
  background-color: var(--color-status-danger);
  color: #ffffff;
  font-size: 0.625rem;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-full);
  font-weight: 700;
}

.sidebar__footer {
  padding: var(--spacing-3);
  background-color: rgba(15, 23, 42, 0.6);
  border-top: 1px solid var(--color-border);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.node-status { display: flex; align-items: center; gap: var(--spacing-2); }
.node-status__indicator { width: 0.5rem; height: 0.5rem; border-radius: var(--radius-full); background-color: var(--color-status-online); animation: pulse 2s infinite; }
@keyframes pulse { 0% { opacity: 1; } 50% { opacity: 0.5; } 100% { opacity: 1; } }

/* 
  BLOCK: chat-area 
*/
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  background-color: var(--color-bg-base);
}

.chat-header {
  padding: var(--spacing-3);
  background-color: var(--color-bg-panel);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-header__profile { display: flex; align-items: center; gap: var(--spacing-3); }

.mobile-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-md);
  background-color: var(--color-bg-element);
  font-size: 0.875rem;
}
@media (min-width: 768px) { .mobile-toggle-btn { display: none; } }

.chat-header__info { 
  display: flex; 
  align-items: center; 
  gap: var(--spacing-3); 
  min-width: 0;
  flex: 1;
}

.chat-header__info > div {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.chat-header__name-row { 
  display: flex; 
  align-items: center; 
  gap: var(--spacing-2); 
  min-width: 0;
}
.chat-header__name { 
  font-weight: 600; 
  font-size: 1rem; 
  white-space: nowrap; 
  overflow: hidden; 
  text-overflow: ellipsis;
}
.status-badge {
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: 0.625rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}
.status-badge--online { background-color: var(--color-status-online-bg); color: var(--color-status-online); border: 1px solid rgba(16, 185, 129, 0.3); }
.status-badge--offline { background-color: var(--color-status-offline-bg); color: var(--color-status-offline); border: 1px solid rgba(245, 158, 11, 0.3); }

.chat-header__meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-header__actions { display: flex; align-items: center; gap: var(--spacing-2); }
.status-toggle-btn {
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--color-border-light);
  background-color: var(--color-bg-element);
  transition: background-color 0.2s;
}
.status-toggle-btn:hover { background-color: var(--color-bg-element-hover); }

.chat-messages {
  flex: 1;
  padding: var(--spacing-4);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.message-wrapper { display: flex; flex-direction: column; }
.message-wrapper--me { align-items: flex-end; }
.message-wrapper--them { align-items: flex-start; }

.message-bubble {
  max-width: 75%;
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--radius-xl);
  font-size: 0.75rem;
  line-height: 1.5;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.message-bubble--me {
  background-color: var(--color-accent-cyan);
  color: #fff;
  border-bottom-right-radius: 0.125rem;
}
.message-bubble--pending {
  background-color: rgba(217, 119, 6, 0.8);
  color: #fff;
  border: 1px solid rgba(251, 191, 36, 0.3);
}
.message-bubble--them {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: 0.125rem;
}

.message-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
  margin-top: 0.25rem;
  font-size: 0.625rem;
  color: var(--color-text-muted);
  padding: 0 var(--spacing-1);
}

.offline-banner {
  background-color: rgba(245, 158, 11, 0.1);
  border-top: 1px solid rgba(245, 158, 11, 0.3);
  padding: var(--spacing-2) var(--spacing-4);
  font-size: 0.75rem;
  color: #fcd34d;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chat-input-area {
  padding: var(--spacing-3);
  background-color: var(--color-bg-panel);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.chat-input-btn {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-xl);
  background-color: var(--color-bg-element);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.chat-input-btn:hover { background-color: var(--color-bg-element-hover); }
.chat-input-btn--primary {
  background-color: var(--color-accent-cyan);
  color: #fff;
  box-shadow: 0 4px 6px -1px rgba(6, 182, 212, 0.3);
}
.chat-input-btn--primary:hover { background-color: var(--color-accent-cyan-hover); }

.chat-input-wrapper {
  flex: 1;
  background-color: var(--color-bg-base);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  padding: var(--spacing-2) var(--spacing-3);
  display: flex;
}
.chat-input-wrapper:focus-within { border-color: var(--color-accent-cyan); }
.chat-input {
  width: 100%;
  background-color: transparent;
  color: var(--color-text-primary);
  font-size: 1rem;
}
.chat-input::placeholder { color: var(--color-text-muted); }

/* 
  BLOCK: content-container (max-width wrapper for crypto/analytics)
*/
.content-container {
  max-width: 64rem; /* 1024px */
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

/* 
  BLOCK: card 
*/
.card {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-5);
}

.card__title {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-2);
}
.card__subtitle {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-3);
}
.card__header-title { font-weight: 600; font-size: 1rem; }
.card__tag {
  font-size: 0.75rem;
  background-color: var(--color-bg-element);
  color: var(--color-accent-cyan-light);
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
}

.card__text-muted { font-size: 0.75rem; color: var(--color-text-secondary); margin-bottom: var(--spacing-4); }

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
}
@media (min-width: 768px) {
  .card-grid { grid-template-columns: 1fr 1fr; }
}
.card-grid--3 {
  grid-template-columns: 1fr;
  gap: var(--spacing-4);
}
@media (min-width: 640px) {
  .card-grid--3 { grid-template-columns: repeat(3, 1fr); }
}
.card-grid--4 { grid-template-columns: 1fr; }
@media (min-width: 640px) {
  .card-grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* 
  BLOCK: form-group
*/
.form-group { margin-bottom: var(--spacing-3); }
.form-group__label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-1);
}
.form-control {
  width: 100%;
  background-color: var(--color-bg-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--spacing-2);
  font-size: 0.6875rem;
  color: var(--color-text-primary);
}
.form-control--cyan { color: var(--color-accent-cyan-light); }
.form-control--rose { color: var(--color-status-danger); }
.form-control:focus { border-color: var(--color-accent-cyan); }
.form-textarea { resize: none; }

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  width: 100%;
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-lg);
  font-weight: 500;
  font-size: 0.75rem;
  transition: all 0.2s ease;
}
.btn--secondary { background-color: var(--color-bg-element); }
.btn--secondary:hover { background-color: var(--color-bg-element-hover); }
.btn--cyan { background-color: var(--color-accent-cyan); color: #fff; }
.btn--cyan:hover { background-color: var(--color-accent-cyan-hover); }
.btn--emerald { background-color: #059669; color: #fff; }
.btn--emerald:hover { background-color: #047857; }
.btn--danger { background-color: var(--color-status-danger-bg); color: var(--color-status-danger); border: 1px solid rgba(225, 29, 72, 0.3); }
.btn--danger:hover { background-color: var(--color-status-danger); color: #fff; }

.btn-group { display: flex; gap: var(--spacing-2); margin-top: var(--spacing-2); }
.btn-group .btn { flex: 1; }

/* 
  BLOCK: step-box 
*/
.step-box {
  background-color: var(--color-bg-base);
  padding: var(--spacing-4);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.step-box__icon { font-size: 1.5rem; margin-bottom: var(--spacing-2); }
.step-box__title { font-weight: 700; font-size: 0.75rem; margin-bottom: 0.25rem; }
.step-box__desc { font-size: 0.6875rem; color: var(--color-text-secondary); }
.step-box__desc--bold { color: #fff; font-weight: 700; }

/* 
  BLOCK: stat-box 
*/
.stat-box {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-4);
}
.stat-box__label { font-size: 0.75rem; color: var(--color-text-secondary); }
.stat-box__value { font-size: 1.5rem; font-weight: 700; margin-top: 0.25rem; }
.stat-box__value--cyan { color: var(--color-accent-cyan-light); }
.stat-box__value--purple { color: #c084fc; }
.stat-box__value--emerald { color: var(--color-status-online); }
.stat-box__desc { font-size: 0.625rem; color: var(--color-text-muted); font-weight: 500;}
.stat-box__desc--emerald { color: var(--color-status-online); }

.chart-container {
  position: relative;
  width: 100%;
  max-width: 650px;
  margin: 0 auto;
  height: 280px;
  max-height: 350px;
}
@media (min-width: 768px) {
  .chart-container { height: 320px; }
}

/* 
  BLOCK: modal 
*/
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: var(--color-overlay);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.modal-overlay--open {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 24rem;
  padding: var(--spacing-5);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-3);
  margin-bottom: var(--spacing-4);
}

.modal-title { font-weight: 700; font-size: 1rem; }
.modal-close { font-size: 1.125rem; color: var(--color-text-secondary); }
.modal-close:hover { color: #fff; }

.modal-body {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-4);
}
.modal-body--left { text-align: left; }

.modal-text { font-size: 0.75rem; color: var(--color-text-secondary); }

.qr-box {
  background-color: #fff;
  padding: var(--spacing-3);
  border-radius: var(--radius-xl);
  display: inline-block;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
  margin: 0 auto;
}

.token-box {
  background-color: var(--color-bg-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--spacing-2);
  color: var(--color-accent-cyan-light);
  font-size: 0.625rem;
  word-break: break-all;
  user-select: all;
  text-align: left;
}

.modal-footer {
  display: flex;
  gap: var(--spacing-2);
  padding-top: var(--spacing-2);
}
.modal-footer__right {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-2);
}