:root {
  --bg: #f1f5f9;
  --surface: #ffffff;
  --surface-hover: #f8fafc;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
  --radius: 12px;
  --radius-sm: 8px;

  --company-primary: #0f172a;
  --company-primary-dark: #020617;
  --company-tint: #e2e8f0;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app {
  display: grid;
  grid-template-columns: 320px 1fr;
  height: 100vh;
  overflow: hidden;
}

/* --------------------------------------------------------------------------
   Sidebar
   -------------------------------------------------------------------------- */

.sidebar {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 20px;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.logo-mark {
  width: 40px;
  height: 40px;
  color: var(--company-primary);
}

.logo-mark svg {
  width: 100%;
  height: 100%;
}

.sidebar-header h1 {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.2;
}

.sidebar-header p {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.new-chat-button {
  width: 100%;
  margin-bottom: 16px;
  padding: 12px;
  font-weight: 600;
}

.company-selector {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 20px;
}

.company-selector label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.company-selector select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  background: var(--surface);
}

.customize-button {
  width: 100%;
  padding: 8px 12px;
  font-size: 0.8125rem;
}

.conversation-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.conversation-list-header h2 {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.count {
  background: var(--company-tint);
  color: var(--company-primary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
}

.conversation-list {
  flex: 1;
  overflow-y: auto;
  margin: 0 -8px;
  padding: 0 8px;
}

.empty-state {
  color: var(--text-muted);
  font-size: 0.875rem;
  text-align: center;
  padding: 24px 8px;
}

.conversation-group {
  margin-bottom: 12px;
}

.conversation-group-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 8px 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.group-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.conversation-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: background 120ms ease;
}

.conversation-item:hover,
.conversation-item.active {
  background: var(--surface-hover);
}

.conversation-item.active {
  outline: 1px solid var(--border);
}

.conversation-item-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
}

.conversation-item-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.conversation-item-info strong {
  font-size: 0.875rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-item-info span {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: capitalize;
}

/* --------------------------------------------------------------------------
   Chat area
   -------------------------------------------------------------------------- */

.chat-area {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  overflow: hidden;
}

.empty-chat {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: var(--text-muted);
  text-align: center;
}

.empty-chat-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.empty-chat-bar strong {
  font-size: 1.05rem;
  color: var(--text);
}

.empty-chat-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 40px;
}

.empty-chat-icon {
  width: 80px;
  height: 80px;
  margin-bottom: 20px;
  color: var(--border);
}

.empty-chat h2 {
  margin: 0 0 8px;
  color: var(--text);
  font-size: 1.25rem;
}

.empty-chat p {
  margin: 0;
  font-size: 0.9375rem;
}

.active-chat {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.chat-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
}

.icon-button:hover {
  background: var(--surface-hover);
}

/* The drawer toggle is only relevant on narrow screens. */
.sidebar-toggle {
  display: none;
}

.company-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-icon {
  width: 44px;
  height: 44px;
}

.brand-info h2 {
  margin: 0;
  font-size: 1.05rem;
}

.brand-info p {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-transform: capitalize;
}

.actions {
  display: flex;
  gap: 10px;
}

.secure-status {
  margin: 16px 24px 0;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.secure-status.waiting {
  background: #fef3c7;
  border: 1px solid #fde68a;
  color: #92400e;
}

.secure-status.active {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  margin: 16px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.message {
  max-width: 70%;
  padding: 10px 14px;
  border-radius: var(--radius);
  margin-bottom: 14px;
  box-shadow: var(--shadow);
}

.message .sender {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 4px;
  opacity: 0.8;
}

.message p {
  margin: 0 0 6px;
  word-break: break-word;
}

.message time {
  display: block;
  font-size: 0.7rem;
  opacity: 0.8;
}

.message .read-receipt {
  display: block;
  font-size: 0.7rem;
  margin-top: 4px;
  opacity: 0.9;
}

.message.company {
  margin-left: auto;
  background: var(--company-primary);
  color: #ffffff;
  border-bottom-right-radius: 4px;
}

.message.company .read-receipt {
  color: #ffffff;
}

.message.contact {
  margin-right: auto;
  background: var(--company-tint);
  color: var(--text);
  border-bottom-left-radius: 4px;
}

.message.system {
  margin: 0 auto;
  background: #fef3c7;
  color: #92400e;
  text-align: center;
  max-width: 80%;
}

.send-form {
  display: flex;
  gap: 10px;
  margin: 0 24px 12px;
}

.send-form input {
  flex: 1;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
}

.media-bar {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin: 0 24px 16px;
}

.recording-status {
  font-size: 0.875rem;
  color: #dc2626;
}

.media-attachment {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-start;
}

.media-open {
  font-size: 0.8125rem;
}

.media-meta {
  font-size: 0.75rem;
  opacity: 0.85;
}

.media-inline {
  max-width: 100%;
  max-height: 240px;
  border-radius: var(--radius-sm);
}

.offload-info {
  margin: 0 24px 24px;
  padding: 14px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-sm);
}

.offload-info p {
  margin: 0 0 8px;
  font-size: 0.875rem;
}

.offload-info input {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 8px;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  word-break: break-all;
}

.copy-confirmation {
  font-size: 0.875rem;
  color: #16a34a;
  margin-left: 8px;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

button {
  padding: 10px 16px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  cursor: pointer;
  transition:
    filter 120ms ease,
    transform 40ms ease;
}

button:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

button.primary {
  background: var(--company-primary);
  color: #ffffff;
}

button.primary:hover:not(:disabled) {
  background: var(--company-primary-dark);
}

button.secondary {
  background: var(--company-tint);
  color: var(--company-primary-dark);
}

button.secondary:hover:not(:disabled) {
  filter: brightness(0.96);
}

button.danger {
  background: #dc2626;
  color: #ffffff;
}

button.danger:hover:not(:disabled) {
  background: #b91c1c;
}

/* --------------------------------------------------------------------------
   Modal
   -------------------------------------------------------------------------- */

.modal {
  border: none;
  border-radius: var(--radius);
  padding: 0;
  box-shadow:
    0 20px 25px -5px rgba(15, 23, 42, 0.15),
    0 8px 10px -6px rgba(15, 23, 42, 0.1);
  max-width: 420px;
  width: 90vw;
}

.modal::backdrop {
  background: rgba(15, 23, 42, 0.45);
}

.modal-wide {
  max-width: 560px;
}

.modal-subtitle {
  margin: -8px 0 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.modal-hint {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.branding-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.branding-preview-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.branding-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.branding-preview-box {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
  padding: 12px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-hover);
  overflow: hidden;
}

.branding-preview-box img {
  max-width: 100%;
  max-height: 120px;
  object-fit: contain;
}

.branding-preview-box .branding-empty {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.branding-rect-preview {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--company-primary);
}

.branding-preview-item input[type="file"] {
  font-size: 0.8125rem;
}

.customize-status {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
}

.customize-status.error {
  background: #fef2f2;
  border-color: #fecaca;
  color: #991b1b;
}

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

.modal-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 24px;
}

.modal-form h2 {
  margin: 0 0 4px;
  font-size: 1.25rem;
}

.modal-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.modal-form input,
.modal-form select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  color: var(--text);
}

.company-preview {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  border-radius: var(--radius-sm);
  background: var(--preview-color, var(--company-tint));
}

.preview-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.company-preview strong {
  display: block;
  font-size: 0.9375rem;
  color: var(--text);
}

.company-preview p {
  margin: 2px 0 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 4px;
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */

.hidden {
  display: none !important;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 20;
    width: 280px;
    max-width: 85vw;
    transform: translateX(-100%);
    transition: transform 200ms ease;
    box-shadow: 0 0 0 rgba(15, 23, 42, 0);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.25);
  }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 15;
    background: rgba(15, 23, 42, 0.45);
  }

  .chat-area {
    width: 100%;
  }

  .sidebar-toggle {
    display: inline-flex;
  }
}