.input-bar {
  flex-shrink: 0;
  display: flex;
  align-items: flex-end;
  gap: 0.75rem;
  padding: var(--input-padding-y) var(--input-padding-x) var(--content-padding-y);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
}

.file-input {
  position: absolute;
  width: 0.1px;
  height: 0.1px;
  opacity: 0;
  overflow: hidden;
  z-index: -1;
}

.btn {
  padding: 0.6rem 1.1rem;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.2s ease, transform 0.1s ease, box-shadow 0.2s ease;
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.btn-attach {
  background: var(--color-header);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1.4;
  min-height: 44px;
}

.btn-attach:hover {
  background: var(--color-primary-hover);
}

.btn-send {
  background: var(--color-header);
  color: #fff;
  box-shadow: var(--shadow-sm);
  min-height: 44px;
}

.btn-send:hover:not(:disabled) {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.input-bar textarea {
  flex: 1;
  min-height: 48px;
  max-height: 140px;
  padding: 0.75rem 1.125rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.9375rem;
  resize: none;
  line-height: 1.5;
  background: var(--color-surface-alt);
  color: var(--color-text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.input-bar textarea:hover {
  border-color: #94a3b8;
  background: var(--color-surface);
}

.input-bar textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 26, 26, 0.12);
  background: var(--color-surface);
}

.input-bar textarea::placeholder {
  color: var(--color-text-muted);
}