:root {
  --internal-bg: #f7f8fb;
  --internal-border: #e3e7ee;
  --internal-muted: #7b8794;
  --internal-primary: #1e88e5;
  --internal-card: #ffffff;
}

[data-theme="dark"] {
  --internal-bg: #0b1220;
  --internal-border: #1f2937;
  --internal-muted: #94a3b8;
  --internal-primary: #60a5fa;
  --internal-card: #0f172a;
}

.main-tabs {
  background: var(--internal-bg);
  border-top: 1px solid var(--internal-border);
}

.header-tabs {
  border-bottom: none;
}

.header-tabs .nav-link {
  border-radius: 8px;
  font-size: 13px;
  padding: 6px 10px;
}

.header-tabs .nav-link.active {
  background: rgba(30, 136, 229, 0.12);
  border-color: transparent;
  color: var(--internal-primary);
}

@media (max-width: 576px) {
  .header-tabs .nav-link {
    padding: 6px 8px;
  }

  .header-tabs .nav-link .header-tab-label {
    display: none;
  }

  .header-tabs .nav-link i {
    margin-right: 0 !important;
  }
}

.main-tabs-content {
  background: var(--internal-bg);
}

.internal-chat-root {
  min-height: calc(100vh - 170px);
}

.internal-chat-sidebar {
  border-right: 1px solid var(--internal-border);
  background: #fff;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 16px;
}

[data-theme="dark"] .internal-chat-sidebar,
[data-theme="dark"] .internal-chat-header,
[data-theme="dark"] .internal-chat-search input,
[data-theme="dark"] .internal-filter-chip {
  background: #0f172a;
}

[data-theme="dark"] .internal-chat-search input {
  border-color: #1f2937;
  color: #e5e7eb;
}

[data-theme="dark"] .internal-chat-title,
[data-theme="dark"] .internal-chat-item-title,
[data-theme="dark"] .internal-chat-header-title {
  color: #e5e7eb;
}

[data-theme="dark"] .internal-chat-list-empty {
  background: #111827;
  color: #94a3b8;
}

.internal-chat-search {
  position: relative;
}

.internal-chat-search i {
  position: absolute;
  top: 50%;
  left: 12px;
  transform: translateY(-50%);
  color: var(--internal-muted);
  font-size: 14px;
}

.internal-chat-search input {
  padding-left: 34px;
  border-radius: 12px;
}

.internal-chat-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.internal-filter-chip {
  border: 1px solid var(--internal-border);
  background: #fff;
  color: var(--internal-muted);
  font-size: 12px;
  font-weight: 600;
  border-radius: 999px;
  padding: 4px 12px;
  transition: all 0.2s ease;
}

.internal-filter-chip.active {
  background: rgba(30, 136, 229, 0.12);
  border-color: rgba(30, 136, 229, 0.3);
  color: var(--internal-primary);
}

.internal-chat-sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.internal-chat-title {
  font-weight: 700;
  color: #2c3e50;
  display: flex;
  align-items: center;
  gap: 8px;
}

.internal-chat-actions {
  display: flex;
  gap: 8px;
}

.internal-chat-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.internal-chat-section-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--internal-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.internal-chat-section-count {
  background: rgba(30, 136, 229, 0.12);
  color: var(--internal-primary);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
}

.internal-chat-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: calc(100vh - 360px);
  overflow-y: auto;
}

.internal-chat-list-empty {
  display: none;
  font-size: 12px;
  color: var(--internal-muted);
  background: #f4f6fb;
  border-radius: 10px;
  padding: 10px 12px;
}

.internal-chat-item {
  border: 1px solid var(--internal-border);
  border-radius: 12px;
  padding: 10px 12px;
  background: var(--internal-card);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.internal-chat-item:hover {
  border-color: rgba(30, 136, 229, 0.4);
  box-shadow: 0 4px 12px rgba(30, 136, 229, 0.1);
}

.internal-chat-item.active {
  border-color: var(--internal-primary);
  box-shadow: 0 6px 14px rgba(30, 136, 229, 0.15);
}

.internal-chat-item-main {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.internal-chat-item-title {
  font-weight: 600;
  color: #1f2d3d;
}

.internal-chat-item-meta {
  font-size: 12px;
  color: var(--internal-muted);
}

.internal-chat-item-badge {
  background: rgba(30, 136, 229, 0.12);
  color: var(--internal-primary);
  font-weight: 700;
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 11px;
}

.internal-chat-panel {
  display: flex;
  flex-direction: column;
  background: var(--internal-bg);
  min-height: calc(100vh - 170px);
}

.internal-chat-header {
  padding: 16px;
  border-bottom: 1px solid var(--internal-border);
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.internal-chat-header-main {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.internal-chat-header-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.internal-chat-header-title {
  font-size: 18px;
  font-weight: 700;
  color: #1f2d3d;
}

.internal-chat-status {
  font-size: 11px;
  font-weight: 700;
  color: #ef5350;
  background: rgba(239, 83, 80, 0.12);
  border-radius: 999px;
  padding: 2px 8px;
}

.internal-chat-status.online {
  color: #2e7d32;
  background: rgba(46, 125, 50, 0.12);
}

.internal-chat-header-subtitle {
  font-size: 13px;
  color: var(--internal-muted);
}

.internal-chat-header-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--internal-muted);
}

.internal-chat-header-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.internal-chat-body {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  position: relative;
}

.internal-chat-load-more {
  display: none;
  justify-content: center;
  margin-bottom: 12px;
}

.internal-chat-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.internal-chat-empty-card {
  background: #fff;
  border: 1px dashed var(--internal-border);
  padding: 24px 32px;
  border-radius: 18px;
  text-align: center;
  color: var(--internal-muted);
}

.internal-chat-empty-card i {
  font-size: 32px;
  margin-bottom: 8px;
}

.internal-chat-messages {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.internal-chat-date {
  display: flex;
  justify-content: center;
  margin: 6px 0 2px;
}

.internal-chat-date span {
  background: #fff;
  border: 1px solid var(--internal-border);
  color: var(--internal-muted);
  font-size: 11px;
  padding: 2px 10px;
  border-radius: 999px;
}

.internal-message {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  max-width: 80%;
  align-self: flex-start;
}

.internal-message.mine {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.internal-message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(30, 136, 229, 0.15);
  color: var(--internal-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 12px;
  flex-shrink: 0;
}

.internal-message-bubble {
  background: #fff;
  border: 1px solid var(--internal-border);
  border-radius: 16px;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.04);
}

.internal-message.mine .internal-message-bubble {
  background: rgba(30, 136, 229, 0.1);
  border-color: rgba(30, 136, 229, 0.2);
}

.internal-message-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  color: #1f2d3d;
}

.internal-message-sender {
  font-weight: 700;
}

.internal-message-text {
  white-space: pre-wrap;
  word-break: break-word;
}

.internal-message-time {
  font-size: 11px;
  color: var(--internal-muted);
  font-weight: 500;
  white-space: nowrap;
}

.internal-message.compact .internal-message-header {
  display: none;
}

.internal-message.compact .internal-message-avatar {
  visibility: hidden;
}

.internal-chat-composer {
  display: flex;
  gap: 12px;
  padding: 16px;
  border-top: 1px solid var(--internal-border);
  background: #fff;
  align-items: flex-end;
}

.internal-chat-composer-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.internal-chat-composer textarea {
  resize: none;
}

.internal-chat-composer-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--internal-muted);
}

.internal-chat-counter {
  font-weight: 600;
}

.internal-chat-draft {
  color: #ef6c00;
  font-weight: 600;
}

.internal-chat-composer-actions {
  display: flex;
  align-items: flex-end;
}

.internal-scroll-to-bottom {
  position: absolute;
  right: 16px;
  bottom: 24px;
  border: none;
  background: #fff;
  border-radius: 999px;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.15);
  width: 36px;
  height: 36px;
  display: none;
  align-items: center;
  justify-content: center;
  color: var(--internal-primary);
}

.internal-new-msg-indicator {
  position: absolute;
  right: 60px;
  bottom: 24px;
  background: var(--internal-primary);
  color: #fff;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  display: none;
  cursor: pointer;
}
}

@media (max-width: 768px) {
  .internal-chat-root {
    min-height: auto;
  }

  .internal-chat-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--internal-border);
  }

  .internal-message {
    max-width: 90%;
  }

  .internal-chat-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .internal-chat-header-actions {
    width: 100%;
    justify-content: flex-end;
  }
}